Lens, lamp strip assembly, backlight module and display device

Abstract

This invention discloses a lens, a light strip assembly, a backlight module, and a display device, relating to the field of backlight module technology. The lens, used in a light strip assembly with a circuit board, has an incident light end and a reflecting light end facing each other in a first direction. A side-emitting light portion is formed between the incident light end and the reflecting light end. The incident light end is positioned towards a light source, and the lens is used to guide light emitted from the light source through the incident light end, reflect it at the reflecting light end, and then emit light through the side-emitting light portion. A recessed section in the side-emitting light portion forms a slot for a reflective film on the side of the lens to be inserted. The slot is positioned close to the incident light end in the first direction. The technical solution provided by this invention improves the structure of the lens so that a slot is formed around the lens periphery. The reflective film is inserted into the slot through a snap-fit ​​connection. Therefore, by pressing the reflective film, it can be pressed into the slot, achieving a rapid and precise installation effect.

Description

Technical Field

[0001] This invention relates to the field of backlight module technology, and in particular to a lens, a light strip assembly, a backlight module, and a display device. Background Technology

[0002] Traditional reflective lenses have certain structural defects during installation: during the assembly of the backlight module, the reflective film usually needs to be completely avoided by opening through holes, requiring multiple layers of double-sided adhesive to fix the reflective film. This traditional process has obvious drawbacks: 1. It is both labor-intensive and time-consuming, which is obviously unsuitable for modern industries that pursue efficiency and low cost; 2. The difference in the expansion coefficients between the double-sided adhesive and the reflective film makes it easy for high temperature or low temperature stress to cause warping and bulging, resulting in reliability issues.

[0003] Therefore, the backlight module and display product industry needs a more advanced reflective lens design that can achieve both good image quality and quick assembly of the reflective film. Summary of the Invention

[0004] The main objective of this invention is to provide a lens, a light strip assembly, a backlight module, and a display device, which aims to enable quick installation of the reflective film and improve the installation efficiency of the reflective film.

[0005] To achieve the above objectives, the present invention provides a lens for use in a light strip assembly having a circuit board. The lens has an incident light end and a reflecting light end opposite each other in a first direction. The lens forms a side-emitting light portion corresponding to the portion between the incident light end and the reflecting light end. The incident light end is arranged facing a light source. The lens is at least used to guide light emitted from the light source to enter through the incident light end, be reflected at the reflecting light end, and then exit through the side-emitting light portion. The side-emitting light portion is partially recessed to form a slot for a reflective film on the side of the lens to be inserted. The slot is arranged close to the incident light end in the first direction.

[0006] In one embodiment, two slots are formed, located on opposite sides of the lens in a radial direction; or, The lens has four slots, two of which are arranged opposite each other in the radial direction of the lens, and the other two slots are also arranged opposite each other in the radial direction of the lens. The relative directions of the two slots are perpendicular to the relative directions of the other two slots.

[0007] In one embodiment, the slot is formed on the periphery of the lens and extends circumferentially along the lens.

[0008] In one embodiment, the dimension A of the slot in the radial direction of the lens is 1.2mm≤A≤2.0mm; The dimension of the card slot in the first direction is B, where 0.1mm ≤ B ≤ 0.4mm; The distance from the card slot to the light-incident end is C, where 2.0mm ≤ C ≤ 3.0mm.

[0009] In one embodiment, the angle between the opening direction of the card slot and a third direction is α, where 0°≤α≤30°.

[0010] The present invention also proposes a light strip assembly, the light strip assembly comprising: Circuit board; At least one light source is mounted on the circuit board; and, A lens is mounted on the circuit board, and the number of lenses is set in correspondence with the number of light sources, such that each light source is covered by its corresponding lens. The lens is used in a light strip assembly with a circuit board. The lens has an incident light end and a reflecting light end facing each other in a first direction. The lens forms a side light emitting section corresponding to the portion between the incident light end and the reflecting light end. The incident light end is arranged facing the light source. The lens is at least used to guide light emitted from the light source to enter through the incident light end, reflect it at the reflecting light end, and then emit light through the side light emitting section. The side light emitting section is partially recessed to form a slot. The slot is used for a reflective film on the side of the lens to be inserted. The slot is arranged close to the incident light end in the first direction.

[0011] The present invention also proposes a backlight module, the backlight module comprising: Back panel; At least one light strip assembly extends along a second direction; The reflective film is provided with multiple through holes, and the lenses of the light strip assembly are respectively installed in the multiple through holes. The reflective film is at least partially located in the slot of the lens and is held between the circuit board and the lens in a first direction. The lens is used in a light strip assembly with a circuit board. The lens has an incident light end and a reflecting light end facing each other in a first direction. The lens forms a side light emitting section corresponding to the portion between the incident light end and the reflecting light end. The incident light end is arranged facing the light source. The lens is at least used to guide light emitted from the light source to enter through the incident light end, reflect it at the reflecting light end, and then emit light through the side light emitting section. The side light emitting section is partially recessed to form a slot. The slot is used for a reflective film on the side of the lens to be inserted. The slot is arranged close to the incident light end in the first direction.

[0012] In one embodiment, the distance between the sidewall of the through hole and the bottom wall of the slot is D, where 0.1mm≤D≤0.3mm.

[0013] In one embodiment, the reflective film is located in the portion between two adjacent light bar assemblies and is recessed in the back plate toward the lens, wherein the reflective film is elastically disposed.

[0014] The present invention also proposes a display device, the display device comprising a backlight module, the backlight module comprising: Back panel; At least one light strip assembly extends along a second direction; The reflective film is provided with multiple through holes, and the lenses of the light strip assembly are respectively installed in the multiple through holes. The reflective film is at least partially located in the slot of the lens and is held between the circuit board and the lens in a first direction. The lens is used in a light strip assembly with a circuit board. The lens has an incident light end and a reflecting light end facing each other in a first direction. The lens forms a side light emitting section corresponding to the portion between the incident light end and the reflecting light end. The incident light end is arranged facing the light source. The lens is at least used to guide light emitted from the light source to enter through the incident light end, reflect it at the reflecting light end, and then emit light through the side light emitting section. The side light emitting section is partially recessed to form a slot. The slot is used for a reflective film on the side of the lens to be inserted. The slot is arranged close to the incident light end in the first direction.

[0015] The technical solution of this invention improves the structure of the lens so that a groove is formed on the periphery of the lens. The reflective film is inserted into the groove by a snap-fit ​​connection. Therefore, the reflective film can be pressed into the groove by pressing, achieving the technical effect of quick and precise installation. In addition, the installation method using double-sided adhesive is eliminated, which solves the reliability problem caused by the difference in the expansion coefficients of double-sided adhesive and reflective film. Stress in high-temperature or low-temperature environments can easily lead to warping and bulging. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a lens according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of one embodiment of the lens provided; Figure 3 This is a schematic diagram of a structure of an embodiment of the light strip assembly provided by the present invention; Figure 4 A schematic diagram of the structure of an embodiment of the display device provided by the present invention; Figure 5 for Figure 4 A partial structural diagram of the display device before assembly; Figure 6 for Figure 4 A partial structural diagram of the central display device after assembly; Figure 7 for Figure 6 A partial structural diagram of the display device at point A.

[0018] Explanation of icon numbers: 1. Lens; 11. Light-inlet end; 12. Reflecting end; 13. Side light-out section; 14. Slot; 100. Lamp strip assembly; 2. Circuit board; 3. Light source; 1000. Backlight module; 200. Back plate; 300. Reflective film; 310. Via; 10000. Display device.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Traditional reflective lenses have certain structural defects during installation: during the assembly of the backlight module, the reflective film usually needs to be completely bypassed by through-holes, requiring multiple layers of double-sided adhesive tape for fixation. This traditional process has significant drawbacks: it is labor-intensive and time-consuming, and is clearly unsuitable for modern industries that prioritize efficiency and low costs. This invention proposes a new type of lens.

[0024] Please see Figure 1 In one embodiment of the present invention, the lens 1 is used in a light bar assembly 100 having a circuit board 2. The lens 1 has an incident light end 11 and a reflecting end 12 facing each other in a first direction. The lens 1 forms a side light emitting portion 13 corresponding to the portion between the incident light end 11 and the reflecting end 12. The incident light end 11 is arranged toward the light source 3. The lens 1 is at least used to guide the light emitted from the light source 3 to enter through the incident light end 11, be reflected at the reflecting end 12, and then be emitted through the side light emitting portion 13. The side light emitting portion 13 is partially recessed to form a slot 14. The slot 14 is used for the reflective film 300 on the side of the lens 1 to be inserted. The slot 14 is arranged close to the incident light end 11 in the first direction.

[0025] In the technical solution of this invention, lens 1 is a reflective lens 1 made of transparent material, having an incident light end 11 and a reflecting light end 12 facing each other in a first direction. The incident light end 11 is recessed to form a mounting cavity, which is used to mount the light source 3 mounted on the circuit board 2, so that the light source 3 mounted on the circuit board 2 is located within the mounting cavity. The reflecting light end 12 is recessed, and the diameter of the recessed portion gradually decreases in the direction from the reflecting light end 12 to the incident light end 11, and the rate of decrease gradually increases. The inner sidewall of the recessed portion forms a reflective surface. A side-emitting light part 13 is formed on the periphery of lens 1, and is located near the incident light end 11. The end face of the side-emitting light part 13 in the circumferential direction is an outwardly convex arc surface, so that light can be emitted toward the reflective film 300. The light emitted by the light source 3, which is installed corresponding to the lens 1, enters the lens 1 through the light-incident end 11 and is directed toward the reflective end 12. The lens 1 has a reflective film or reflective coating on the reflective surface of the reflective end 12. The light is reflected when it comes into contact with the reflective film or reflective coating at the reflective end 12, causing the light to be directed toward the side light-emitting part 13 between the light-incident end 11 and the reflective end 12, and then emitted from the side light-emitting part 13 (most of the light is emitted from the side light-emitting part 13, but not all of the light is emitted from the side light-emitting part 13). In order to improve the installation efficiency of the reflective film 300, the installation method of the reflective film 300 is changed from adhesive installation to snap-fit ​​installation. By changing the installation method, the installation efficiency is improved. In order to obtain a snap-fit ​​structure that can snap the reflective film 300, the side light-emitting part 13 is partially recessed to form a slot 14. The slot 14 can be located on one side of the lens 1 in the radial direction, or multiple slots 14 can be provided, each located on one side of a different radial direction of the lens 1. The reflective film 300 is held in place by the slot 14, thereby fixing the reflective film 300. By eliminating the use of double-sided adhesive for pasting and fixing, the difference in the coefficient of expansion between the double-sided adhesive and the reflective film 300 is avoided. High temperature or low temperature stress can easily cause warping and bulging, thus improving the stability of product performance.

[0026] In addition, in traditional backlight modules, the reflective film 300 needs to be designed with a via 310 to avoid the reflective lens 1 and is attached to the circuit board 2 with double-sided adhesive. For ease of assembly, a design gap of 1-2mm needs to be reserved between the via 310 of the reflective film 300 and the lens 1. From the first direction, the reflective film 300 is completely located on the outer periphery of the lens 1. When the light reflected by the reflective lens 1 is directed toward the via 310, the light will illuminate the circuit board 2. Since the circuit board 2 itself has a low reflectivity, this part of the light energy will form a "light leakage" loss. In this embodiment, due to the formation of the slot 14, the size of the via 310 can be designed to be smaller than that of the prior art. From the first direction, the reflective film 300 is partially located on the inner side of the lens 1, so the "light leakage" loss is smaller.

[0027] By improving the structure of lens 1, the light leakage problem of traditional backlight modules is mitigated, resulting in an approximately 8% increase in brightness. See the table below for details:

[0028] To ensure multi-directional engagement of the reflective film 300 and prevent it from detaching after installation, thus achieving a more stable limiting effect, multiple slots 14 are provided and spaced apart along the circumference of the lens 1. Multiple slots 14 simultaneously engage with the reflective film 300, thereby enhancing the engagement effect.

[0029] Specifically, in one embodiment, two slots 14 are formed, located on opposite sides of the lens 1. To effectively restrain the reflective film 300 and prevent it from detaching from the circuit board 2 and warping, thus preventing some light from failing to be reflected, two slots 14 are provided, located on opposite sides of the reflective film 300 in the radial direction. For example, they can be positioned on opposite sides of the lens 1 in the third direction, thus providing better restraint of the reflective film 300 on these sides.

[0030] Furthermore, to enhance the confinement effect of the reflective film 300 on both sides in the second direction, in another embodiment, four slots 14 are formed. Two slots 14 are arranged opposite each other in the second direction of the lens 1, and the other two slots 14 are arranged opposite each other in the third direction of the lens 1. The first direction, the second direction, and the third direction are arranged perpendicular to each other. By also providing slots 14 on both sides of the lens 1 in the second direction, the portion around the through hole 310 of the reflective lens 1 is less likely to lift up, allowing the reflective film 300 to adhere tightly to or be closer to the circuit board 2, making it difficult for the reflective film 300 to fall off the slots 14.

[0031] For the second direction of lens 1, a slot 14 is provided on one side of the third direction. The cross-section of lens 1 at the location of the slot 14 can be set to a quadrilateral shape, and the corresponding through hole 310 on the reflective film 300 is also set to a quadrilateral shape. However, when installing lens 1, there are certain requirements for the installation angle of lens 1. The installation angle of the light-incident end 11 needs to correspond with the angle of the through hole 310 for normal matching and installation. Therefore, to facilitate the installation of lens 1, the outer contour of lens 1 at the location of the slot 14 can be set to a circle, that is, the slot 14 is formed on the periphery of lens 1 and extends along the circumference of lens 1 (i.e., the slot 14 is set to an annular shape). The through hole 310 is also set to a circle. Therefore, the center of lens 1 can be aligned with the center of through hole 310 to achieve smooth installation. Since lens 1 is a rotating body, changes in the placement angle of lens 1 do not affect the posture of lens 1 in space, and normal matching between lens 1 and through hole 310 can be achieved.

[0032] To ensure the reflective film 300 is properly seated in the slot 14 and to prevent it from detaching due to vibration or shaking, the depth of the slot 14 is subject to certain requirements. The radial dimension of the slot 14 in the lens 1 is A, where 1.2mm ≤ A ≤ 2.0mm. A represents the radial depth of the slot 14 at the light-receiving end 11 (including the second and third directions). A larger value of A results in a deeper slot 14, allowing for a correspondingly larger portion of the reflective film 300 seated within it, leading to better engagement. However, a larger A value may affect light propagation within the lens 1, hindering lens installation. Therefore, 1.2mm ≤ A ≤ 2.0mm. Based on the thickness of the reflective film 300, the dimension of the slot 14 in the first direction needs to be greater than the thickness of the reflective film 300. However, to prevent significant shaking or easy detachment of the reflective film 300 from the slot, the dimension of the slot 14 in the first direction cannot be too large. Therefore, the dimension of the slot 14 in the first direction is B, where 0.3mm≤B≤0.5mm.

[0033] The effective light-emitting surface of lens 1 is mainly concentrated in the upper half of the side light-emitting part 13 near the reflecting end 12. Therefore, the 2-3mm height of the slot 14 at the bottom of lens 1 will not significantly affect the optical performance of lens 1.

[0034] Because the reflective film 300 located between two adjacent light strip assemblies 100 is arc-shaped, to facilitate the smooth insertion of the reflective film 300 into the slot 14, the opening direction of the slot 14 is inclined away from the back plate direction. This tilting of the slot 14 opening relative to a horizontal orientation reduces the possibility of the reflective film 300 detaching from the slot 14. Please refer to... Figure 2The angle between the opening direction of the slot 14 and the third direction is α. To increase the reflection angle of light and make the light dispersion more uniform, 0°≤α≤30°. The value of α is related to the size of the backlight module 1000. The larger the size of the backlight module 1000, the larger the corresponding value of α. Generally, when the value of α is equal to 0°, the slot 14 can meet the installation requirements of the reflective film 300 of the 55-inch and smaller backlight module 1000, and the reflective film 300 is not easy to fall off from the slot 14. When the size of the backlight module 1000 increases, the size of the corresponding reflective film 300 increases. In order to increase the emission angle of light, which is beneficial to uniform image quality and save the number of light sources 3, in the first direction, the reflective film 300 forms a concave gradient arc surface structure between two adjacent lenses 1. When the opening direction of the slot 14 is tilted (tilted towards the reflecting end 12 in the first direction), the reflective film 300 located between the two lenses 1 is guided by the slot 14 to first extend towards the reflecting end 12 in the first direction. Then, under the action of external force, the reflective film 300 deforms and bends towards the light-incident end 11, increasing the depth of the gradient arc surface structure relative to the horizontal engagement direction. The larger the value of 'a', the greater the depth of the gradient arc surface structure. The greater the depth of the gradient arc surface structure, the greater the angle of the reflected light. This can better uniformize the image quality and save the number of light sources 3. In addition, with the opening direction of the slot 14 tilted, the reflective film 300 recovers its deformation and abuts against the side wall of the slot 14, increasing the friction and making it less likely for the reflective film 300 to fall out of the slot 14. However, the value of 'a' should not be too large, otherwise it will be difficult for the reflective film 300 to be inserted into the slot 14. Therefore, the maximum value of 'a' should not exceed 30 degrees.

[0035] The present invention also proposes a light strip assembly 100, please refer to [link / reference]. Figure 3 The light strip assembly 100 includes a circuit board 2, at least one light source 3 mounted on the circuit board 2, and a lens 1 mounted on the circuit board 2. The number of lenses 1 corresponds to the number of light sources 3, such that each light source 3 is covered by a corresponding lens 1. The lens 1 in the light strip assembly 100 with the circuit board 2 has an incident light end 11 and a reflecting end 12 facing each other in a first direction. The portion of the lens 1 between the incident light end 11 and the reflecting end 12 forms a side-emitting light portion 13. The incident light end 11 is positioned towards the light source 3. The lens 1 is at least used to guide light emitted from the light source 3 through the incident light end 11, reflect it at the reflecting end 12, and then emit light through the side-emitting light portion 13. The side-emitting light portion 13 is partially recessed to form a slot 14 for a reflective film 300 on the side of the lens 1 to be inserted. The slot 14 is positioned close to the incident light end 11 in the first direction.

[0036] Because the lens 1 used in the light strip assembly 100 has a slot 14, the slot 14 can be engaged with the reflective film 300 for snap-fit ​​installation, replacing the double-sided adhesive bonding between the circuit board 2 and the reflective film 300. This not only simplifies the installation process and improves assembly efficiency, but also enhances the reliability of the fit. Furthermore, the seamless engagement structure between the reflective film 300 and the slot 14 improves the light leakage and loss problems associated with traditional installation methods, significantly increasing brightness.

[0037] For a smaller backlight module 1000, the number of light sources 3 in the light strip assembly 100 can be set to one, and the number of lenses 1 can also be set to one, with one lens 1 covering one light source 3.

[0038] In a larger backlight module 1000, the number of light sources 3 in the light strip assembly 100 can be set to multiple, and the number of lenses 1 can also be set to multiple, with multiple lenses 1 covering multiple light sources 3. Specifically: the circuit board 2 extends along the second direction; multiple light sources 3 are spaced apart on the circuit board 2 along the second direction; and the light-incident end 11 of the lens 1 is recessed to form a mounting cavity. Multiple lenses 1 are spaced apart on the circuit board 2 along the second direction and respectively cover multiple light sources 3, with the multiple light sources 3 located in multiple mounting cavities.

[0039] This invention also proposes a backlight module 1000, please refer to [link / reference]. Figure 4 The backlight module 1000 includes: a backplate 200, at least one LED strip assembly 100, and a reflective film 300. The LED strip assembly 100 extends along a second direction. The reflective film 300 is provided with a plurality of through holes 310, and a plurality of lenses 1 are respectively installed in the plurality of through holes 310. The reflective film 300 is at least partially located in a slot 14 and is held between the circuit board 2 and the lenses 1 in the first direction. The reflective film 300 is elastically disposed. The lenses 1 are used in the LED strip assembly 100 having the circuit board 2, and the lenses 1 have a first direction. The lens 1 forms a side light-emitting portion 13 corresponding to the portion between the light-incident end 11 and the reflective end 12. The light-incident end 11 is positioned toward the light source 3. The lens 1 is used to guide light emitted from the light source 3 through the light-incident end 11, reflect it at the reflective end 12, and then emit light through the side light-emitting portion 13. The side light-emitting portion 13 is partially recessed to form a slot 14. The slot 14 is used for the reflective film 300 on the side of the lens 1 to be inserted. The slot 14 is positioned close to the light-incident end 11 in the first direction.

[0040] In the backlight module 1000, the number of LED strip assemblies 100 can be one or more, and the multiple LED strip assemblies 100 are arranged at intervals along a third direction. Where the second direction is perpendicular to the third direction, and the second direction corresponds to the longitudinal or transverse direction of the backlight module 1000, the third direction corresponds to the transverse or longitudinal direction of the backlight module 1000. The number and spacing of the LED strip assemblies 1000 in the backlight module 1000 are determined based on the size and performance parameters of the display device 10000.

[0041] The specific structure of the lens 1 is as described in the above embodiments. Since the backlight module 1000 adopts all the technical solutions of all the above embodiments, the slot 14 and the reflective film 300 are engaged and installed, replacing the double-sided adhesive bonding between the circuit board 2 and the reflective film 300. This not only simplifies the installation process and improves assembly efficiency, but also makes the fit more reliable. Furthermore, the partial engagement of the reflective film 300 into the slot 14 improves the light leakage loss problem existing in the traditional installation method, significantly improving brightness. It also avoids the problem of warping and bulging easily caused by the difference in the expansion coefficients of the double-sided adhesive and the reflective film 300, which can lead to stress tension in high or low temperature environments.

[0042] Please see Figure 5 , Figure 5 This is a partial structural diagram of the backlight module 1000 before assembly; multiple through holes 310 on the reflective film 300 are correspondingly arranged with multiple lenses 1. When pressure is applied downwards, due to the elasticity of the reflective film 300, the through holes 310 expand, allowing the upper end of the light-emitting part 13 on the lens 1 side to pass through the through hole 310. The reflective film 300 then recovers its deformation within the slot 14, thus achieving the effect of being held in place within the slot 14. (See also...) Figure 6 , Figure 6 (This is a partial structural diagram of the backlight module 1000 after assembly.)

[0043] Considering the thermal expansion and contraction of materials and for ease of assembly, a certain gap exists between the through-hole 310 and the lens 1 in the radial direction of the light-incident end 11. Please refer to... Figure 7 The distance D between the sidewall of the via 310 and the bottom wall of the slot 14 is 0.1mm ≤ D ≤ 0.3mm. Generally, for a 32-43 inch backlight module 1000, the corresponding distance D is about 0.1mm; for a 50-65 inch backlight module 1000, the corresponding distance D is about 0.2mm; and for a backlight module 1000 larger than 75 inches, a distance D of 0.3mm is sufficient. The reason for this setting is that the reflective film 300 is a PET substrate, and the larger the size, the more expansion gap needs to be reserved to avoid local warping deformation. This also prevents the reflective film 300 from being unable to stably fit in the slot 14 due to excessively large gaps, effectively ensuring the installation reliability of the reflective film 300, while further reducing light leakage from assembly gaps and maintaining good light output efficiency.

[0044] Corresponding to the different ways of setting the slot 14 of the lens 1 described above, the outline of the through hole 310 includes a quadrilateral or a circle.

[0045] Since the slot 14 structure of the lens 1 has a certain height, the reflective film 300 forms a concave gradient arc surface structure between two adjacent lenses 1, which can increase the reflection angle of the light emitted from the lens, which is beneficial for reducing lamp cost and uniform image quality design.

[0046] The present invention also proposes a display device 10000, which includes a backlight module 1000, comprising: a back plate 200, a plurality of lamp strip assemblies 100, and a reflective film 300; the plurality of lamp strip assemblies 100 extend along a second direction and are spaced apart along a third direction; the reflective film 300 is provided with a plurality of through holes 310, and a plurality of lenses 1 are respectively installed in the plurality of through holes 310; the reflective film 300 is at least partially located in a slot 14 and is held between a circuit board 2 and a lens 1 in a first direction, wherein the reflective film 300 is elastically disposed; wherein the lens 1 is used to have In the light strip assembly 100 with circuit board 2, lens 1 has an incident light end 11 and a reflecting end 12 facing each other in a first direction. Lens 1 forms a side light emitting part 13 corresponding to the portion between the incident light end 11 and the reflecting end 12. The incident light end 11 is set toward the light source 3. Lens 1 is at least used to guide light emitted from the light source 3 to enter through the incident light end 11, be reflected at the reflecting end 12, and then be emitted through the side light emitting part 13. The side light emitting part 13 is partially recessed to form a slot 14. The slot 14 is used for the reflective film 300 on the side of lens 1 to be inserted. The slot 14 is set close to the incident light end 11 in the first direction.

[0047] The display device 10000 also includes a diffuser plate, an optical film, and a liquid crystal panel. A backplate 200 is bent to form a cavity, and a lamp strip assembly 100 is fixedly installed at the bottom of the cavity. The diffuser plate, optical film, and liquid crystal panel are sequentially arranged from the inside out at the opening of the cavity. The diffuser plate and optical film are engaged in the mounting groove formed by the bending of the backplate, and the liquid crystal panel is fixed to the opening of the cavity by adhesive. The peripheral portion of the reflective film 300 is also located within the mounting groove. The peripheral portion of the reflective film 300 is sandwiched between the diffuser plate and the backplate 200 to fix the edge portion of the reflective film 300.

[0048] The specific structure of the backlight module 1000 is as described in the above embodiments. Since the display device 10000 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the above embodiments: the reflective film 300 is installed by snapping together through the slot 14, which replaces the traditional double-sided adhesive bonding, simplifies the assembly process, improves the assembly efficiency, and at the same time, the fit stability of the snapping structure is higher, avoiding the problem of warping and bulging of the reflective film 300 caused by the mismatch of the expansion coefficients of the double-sided adhesive and the reflective film 300 when used in a temperature difference environment for a long time. It also solves the light leakage problem existing in the traditional adhesive installation, reduces light loss, and effectively improves the overall light output brightness of the display device. At the same time, the gradient arc surface reflective structure can optimize the light reflection angle, improve the uniformity of the picture, and reduce the number of light sources 3 used, thereby reducing the overall product cost.

[0049] The above are merely exemplary embodiments of the present invention and do not limit the scope of the patent of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A lens for use in a light strip assembly having a circuit board, characterized in that, The lens has an incident end and a reflecting end opposite each other in a first direction, and the lens forms a side-emitting portion corresponding to the portion between the incident end and the reflecting end; the incident end is arranged to face the light source, and the lens is at least used to guide light emitted from the light source to enter through the incident end, be reflected at the reflecting end, and then exit through the side-emitting portion. The side light-emitting portion is partially recessed to form a slot, which is used for the reflective film on the side of the lens to be inserted. The slot is located close to the light-incident end in the first direction.

2. The lens as claimed in claim 1, characterized in that, Two slots are formed, located on opposite sides of the lens in the radial direction; or, The lens has four slots, two of which are arranged opposite each other in the radial direction of the lens, and the other two slots are also arranged opposite each other in the radial direction of the lens. The relative directions of the two slots are perpendicular to the relative directions of the other two slots.

3. The lens as described in claim 1, characterized in that, The slot is formed on the periphery of the lens and extends circumferentially along the lens.

4. The lens as described in any one of claims 1 to 3, characterized in that, The dimension A of the slot in the radial direction of the lens is 1.2mm≤A≤2.0mm; The dimension of the card slot in the first direction is B, where 0.1mm ≤ B ≤ 0.4mm; The distance from the card slot to the light-incident end is C, where 2.0mm ≤ C ≤ 3.0mm.

5. The lens as described in any one of claims 1 to 3, characterized in that, The angle between the opening direction of the card slot and the third direction is α, where 0°≤α≤30°.

6. A light strip assembly, characterized in that, include: Circuit board; At least one light source is mounted on the circuit board; as well as, The lens as described in any one of claims 1 to 5 is mounted on the circuit board, the number of lenses is arranged in correspondence with the number of light sources, and each light source is covered by a corresponding lens.

7. A backlight module, characterized in that, include: Back panel; At least one light strip assembly as claimed in claim 6 extends along a second direction; The reflective film has multiple through holes, and the lenses of the light strip assembly are respectively installed in the multiple through holes. The reflective film is at least partially located in the slot of the lens and is held between the circuit board and the lens in a first direction.

8. The backlight module as described in claim 7, characterized in that, The distance between the sidewall of the through hole and the bottom wall of the slot is D, where 0.1mm≤D≤0.3mm.

9. The backlight module as described in claim 7, characterized in that, The reflective film is located in the portion between two adjacent light strip assemblies and is recessed in the back plate toward the lens, wherein the reflective film is elastically arranged.

10. A display device, characterized in that, Includes the backlight module as described in any one of claims 7 to 9.

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