CN115933251B - Reflection cover structure with uniform light guide and backlight module - Google Patents

Abstract

The application relates to the technical field of liquid crystal display and discloses a reflecting cover structure with uniform light guide and a backlight module, wherein the reflecting cover structure with uniform light guide comprises a plurality of lamp cups, each lamp cup comprises a first lamp cup, a second lamp cup and a central lamp cup, the heights of the first lamp cup, the second lamp cup and the central lamp cup are sequentially reduced, an included angle between the first lamp cup and the second lamp cup is a first included angle, an included angle between the second lamp cup and the central lamp cup is a second included angle, an included angle between adjacent central lamp cups is a third included angle, the first included angle is larger than the second included angle, the second included angle is larger than the third included angle, and the surface uniformity of light reflected by the reflecting cover to a diffusion plate is improved. The backlight module comprises a die casting and a middle iron frame, a lamp panel, a diffusion plate and a reflecting cover are arranged between the die casting and the middle iron frame, the reflecting cover is used for controlling the divergence direction of light rays, so that the light rays are led into the diffusion plate, and the uniformity of the whole surface of the backlight module is improved. The application has the effect of improving the uniformity of the backlight module surface.

Description

Reflection cover structure with uniform light guide and backlight module

Technical Field

The application relates to the technical field of liquid crystal display, in particular to a reflecting cover structure with uniform light guide and a backlight module.

Background

In recent years, liquid crystal display devices are widely used in the electrical industry due to the characteristics of light and thin volume, small occupied space and the like, and gradually replace the traditional cathode ray tube display devices, and the liquid crystal display devices cannot emit light, so that components capable of providing light sources, such as a backlight module and the like, are required to be arranged on the liquid crystal display devices to provide planar light with sufficient brightness for the liquid crystal display devices. The direct type backlight module is usually arranged in a liquid crystal display, and the direct type backlight module adopts an array type LED surface light source and comprises an LED substrate, mini-LED light sources, quantum dot films, diffusion sheets and brightness enhancement films. At present, a diffusion sheet is adopted for mixing light or a scattering haze particle is added into a fluorescent film for mixing light, but the light transmittance is reduced, so that the overall brightness of a surface light source is affected.

The mura compensation direct type MiniLED backlight module in the related art comprises a PCB substrate, a reflecting cover and an optical film group which are sequentially arranged from bottom to top, wherein the optical film group comprises at least one semi-transparent reflecting film and at least one diffusion film; the semi-transparent reflective membrane satisfies R10 > R30 > R50; and arranging a plurality of micro-lens structures on the light emergent side and/or the light incident side of the diffusion membrane to form a micro-lens structure surface. The light is reflected between the reflecting cover, the diffusion membrane and the semi-transparent reflection membrane for multiple times, so that the light emitting uniformity of the backlight module is realized. However, the mura-compensated direct-type MiniLED backlight module in the related art still has low uniformity of light emission during light emission.

Therefore, the direct type backlight module in the related art has the problem of low light emitting uniformity.

Disclosure of Invention

In order to improve the light emitting uniformity of the backlight module, the application provides a reflection cover structure with uniform light guide and the backlight module.

In a first aspect, the present application provides a reflective cover structure with uniform light guiding, which adopts the following technical scheme:

The utility model provides a light guide even bowl structure, includes the bowl bottom plate and sets up a plurality of lamps and lanterns on the bowl bottom plate, the lamps and lanterns include first lamp cup, second lamp cup and center lamp cup, first lamp cup sets up the bowl bottom plate outermost edge, the second lamp cup with first lamp cup sets up adjacently, center lamp cup with second lamp cup sets up adjacently, the height of first lamp cup is less than the height of second lamp cup, the height of second lamp cup is less than the height of center lamp cup;

The included angle between adjacent first lamp cups is first contained angle, the included angle between adjacent second lamp cups is second contained angle, the included angle between adjacent center lamp cups is third contained angle, first contained angle is greater than the second contained angle, the second contained angle is greater than the third contained angle.

Based on the technical scheme, when the reflecting cover is used, the reflecting cover is attached to the diffusion plate, and as the height of the central lamp cup is higher than that of the second lamp cup, the height of the second lamp cup is higher than that of the first lamp cup, the peripheral wall of the central lamp cup is attached to the diffusion plate, so that the phenomenon of light channeling between subareas is improved, and the outward diffusion of light rays at the central lamp cup is limited; because the first contained angle is greater than the second contained angle, the second contained angle is greater than the third contained angle, consequently the perisporium of second lamp cup and the perisporium of first lamp cup are all not laminated with the diffuser plate, and first lamp cup and second lamp cup department have more light reflection to the edge all around of diffuser plate, and the light through this reflector structure reflection to the diffuser plate on is more even simultaneously.

Preferably, the first lamp cup comprises a first side wall and a first bottom wall, an included angle between the first side wall and the first bottom wall is a first inner included angle, the second lamp cup comprises a second side wall and a second bottom wall, an included angle between the second side wall and the second bottom wall is a second inner included angle, the center lamp cup comprises a third side wall and a third bottom wall, an included angle between the third side wall and the third bottom wall is a third inner included angle, the first inner included angle is larger than the second inner included angle, and the second inner included angle is larger than the third inner included angle.

Based on the technical scheme, the first internal included angle is larger than the second internal included angle, so that more light is reflected by the first lamp cup, the second internal included angle is larger than the third internal included angle, more light is reflected by the second lamp cup, light loss is reduced, and the light on the diffusion plate corresponding to the first lamp cup, the second lamp cup and the central lamp cup is more uniform.

Preferably, the angle of the first included angle is 115-120 degrees, the angle of the second included angle is 82-90 degrees, and the angle of the third included angle is 60-70 degrees.

Based on the technical scheme, the angle of the first included angle is 115-120 degrees, the angle of the second included angle is 82-90 degrees, the angle of the third included angle is 60-70 degrees, more light rays are reflected to the peripheral edges of the diffusion plate at the positions of the first lamp cup and the second lamp cup, and therefore the light rays on the diffusion plate corresponding to the first lamp cup, the second lamp cup and the central lamp cup are more uniform.

Preferably, the angle of the first internal included angle is 145-155 degrees, the angle of the second internal included angle is 130-140 degrees, and the angle of the third internal included angle is 80-90 degrees.

Based on the technical scheme, the angle of the first internal included angle is 145-155 degrees, the angle of the second internal included angle is 130-140 degrees, the angle of the third internal included angle is 80-90 degrees, the light loss in the angle range is lower, and the light reflected to the diffusion plate is more uniform.

Preferably, the difference in height between the first lamp cup and the second lamp cup is equal to the difference in height between the center lamp cup and the second lamp cup.

Based on the technical scheme, the height difference between the first lamp cup and the second lamp cup is controlled to be the same as the height difference between the second lamp cup and the center lamp cup, so that the light reflected to the diffusion plate by the first lamp cup, the second lamp cup and the center lamp cup is more uniform.

Preferably, the height difference between the first lamp cup and the second lamp cup is between 0.5mm and1 mm.

Based on the technical scheme, the thickness of the backlight module with the reflecting cover is limited by controlling the height difference between the first lamp cup and the second lamp cup and the height difference between the second lamp cup and the central lamp cup to be between 0.5mm and 1 mm.

In a second aspect, the present application provides a backlight module, which adopts the following technical scheme:

The utility model provides a backlight unit, includes die casting and well iron frame, the die casting with well iron frame can dismantle the connection, the die casting with follow supreme lamp plate and the diffuser plate of having set gradually down between the well iron frame, the lamp plate with be provided with the reflector between the diffuser plate, the reflector is used for controlling the divergence direction of light, so that light is leading-in the diffuser plate.

Based on the technical scheme, the die casting is detachably connected with the middle iron frame, and the die casting and the middle iron frame form a placing space, so that a lamp panel, a diffusion plate and a reflecting cover are conveniently placed in the placing space; the lamp panel is used as a light source to emit light, the light is reflected to the diffusion plate through the reflection cover, and the light reflected to the diffusion plate is more uniform through the reflection cover, so that the uniformity of the whole surface of the backlight module is improved.

Preferably, the diffusion plate includes an edge portion and a center portion, the edge portion and the center portion being integrally provided, and a thickness of the edge portion is lower than a thickness of the center portion.

Based on the technical scheme, through reducing the thickness of the edge part of the diffusion plate, the light transmittance of the edge part around the diffusion plate is improved, so that the brightness around the backlight module is improved, the surface uniformity of the backlight module is improved, the problems of dark optical effect around the backlight module and low overall surface uniformity are solved, and the overall painting texture of the backlight module is improved.

Preferably, a reflective cover fixing glue is arranged between the reflective cover and the lamp panel, and the reflective cover fixing glue is used for reinforcing the fixation between the reflective cover and the lamp panel.

Based on the technical scheme, the reflector is adhered and fixed on the lamp panel through the reflector fixing adhesive, so that adverse phenomena such as loosening, falling and shifting of the reflector are avoided.

Preferably, a plurality of LED lamps are arranged on the lamp panel, lamp cups are arranged on the reflecting cover, the LED lamps are arranged in one-to-one correspondence with the lamp cups, heat conducting glue is arranged between the lamp panel and the die casting, and the heat conducting glue is used for guiding out heat emitted by the LED lamps.

Based on the technical scheme, the LED lamps and the lamp cups are arranged in one-to-one correspondence, so that the phenomenon of light channeling between adjacent cells is avoided, heat is generated when the LED lamps emit light, the heat is emitted through the heat-conducting glue, and the lamp panel is prevented from being burnt out.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The height of the central lamp cup is higher than that of the second lamp cup, the height of the second lamp cup is higher than that of the first lamp cup, and the peripheral wall of the central lamp cup is attached to the diffusion plate, so that the phenomenon of light channeling between subareas is improved; because the first included angle is larger than the second included angle, the second included angle is larger than the third included angle, more light rays are reflected to the peripheral edge of the diffusion plate at the positions of the first lamp cup and the second lamp cup, and the light rays reflected to the diffusion plate through the reflecting cover structure are more uniform;

2. the first internal included angle is larger than the second internal included angle, so that more light is reflected by the first lamp cup, and the second internal included angle is larger than the third internal included angle, so that more light is reflected by the second lamp cup, and the light loss is reduced;

3. the thickness of the edge part of the diffusion plate is reduced, and the light transmittance of the peripheral edge part of the diffusion plate is improved.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a reflective cover structure with uniform light guiding according to an embodiment of the application;

FIG. 2 shows an enlarged view of portion A of FIG. 1;

FIG. 3 is a side view of a reflective cover structure with uniform light guiding according to an embodiment of the application;

FIG. 4 is a side view of the FIG. 3 view from a different perspective;

fig. 5 is a schematic diagram of the overall structure of a backlight module according to an embodiment of the application;

Fig. 6 is a schematic diagram of a portion of a backlight module according to an embodiment of the application;

FIG. 7 is a schematic view showing the overall structure of a diffusion plate according to an embodiment of the application;

FIG. 8 is a side view of a diffuser plate according to an embodiment of the present application;

fig. 9 shows a side view of fig. 8 from a different perspective.

Reference numerals illustrate: 10. a die casting; 20. a heat-conducting adhesive; 30. a lamp panel; 31. an LED lamp; 40. a reflection cover; 41. a reflective cover bottom plate; 42. a lamp cup; 43. a first lamp cup; 431. a first bottom wall; 432. a first sidewall; 433. a first internal included angle; 44. a second lamp cup; 441. a second bottom wall; 442. a second sidewall; 443. a second internal included angle; 45. a central lamp cup; 451. a third bottom wall; 452. a third sidewall; 453. a third internal included angle; 46. a first included angle; 47. a second included angle; 48. a third included angle; 50. a reflective cover fixing adhesive; 60. a backlight material; 61. a diffusion plate; 611. an edge portion; 612. a center portion; 62. a light-splitting film; 63. a diffusion film; 64. a lower brightness enhancement film; 65. a medium brightness enhancement film; 66. a privacy film; 70. a middle iron frame.

Detailed Description

The present application will be described in further detail below with reference to fig. 1-9, although embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

It should be understood that although the terms "first," "second," "king," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In a first aspect, an embodiment of the present application discloses a reflective cover structure with uniform light guiding.

Referring to fig. 1, the reflective cover structure with uniform light guide comprises a reflective cover bottom plate 41 and a plurality of lamp cups 42, wherein the reflective cover bottom plate 41 is rectangular, the lamp cups 42 are arranged on the reflective cover bottom plate 41 in an array manner, and light rays are reflected by the lamp cups 42, so that light loss can be effectively reduced.

Referring to fig. 2, the lamp cup 42 includes a plurality of first lamp cups 43, a plurality of second lamp cups 44, and a plurality of center lamp cups 45, the plurality of first lamp cups 43 are combined to form a first ring of lamp cups, the first ring of lamp cups is rectangular in shape, and the first ring of lamp cups is disposed at the outermost peripheral edge of the reflective cover bottom plate 41; the plurality of second lamp cups 44 are integrally connected to form a second ring lamp cup, the shape of the second ring lamp cup is rectangular, the rectangle of the second ring lamp cup is smaller than that of the first ring lamp cup, the second ring lamp cup is arranged adjacent to the first ring lamp cup, and the second ring lamp cup is integrally connected with the first ring lamp cup; the central lamp cup 45 is arranged on the inner side of the second lamp cup 44, and a plurality of central lamp cups 45 are combined to form a central ring lamp cup, and the shape of the central ring lamp cup is rectangular.

Referring to fig. 3 and 4, the first lamp cup 43 includes a first sidewall 432 and a first bottom wall 431, the first sidewall 432 is integrally connected with the first bottom wall 431, an included angle between the first sidewall 432 and the first bottom wall 431 is a first inner included angle 433, and an angle of the first inner included angle 433 may be 145 °, 147 °, 149 °, 151 °, 153 °, or 155 °.

Referring to fig. 3 and 4, the second lamp cup 44 includes a second bottom wall 441 and a second side wall 442, the second side wall 442 is integrally connected with the second bottom wall 441, an included angle between the second side wall 442 and the second bottom wall 441 is a second inner included angle 443, and an angle of the second inner included angle 443 may be 130 °,132 °,134 °,136 °, 138 ° or 140 °.

Referring to fig. 3 and 4, the center lamp cup 45 includes a third bottom wall 451 and a third side wall 452, the third side wall 452 is integrally connected with the third bottom wall 451, an included angle between the third side wall 452 and the third bottom wall 451 is a third inner included angle 453, an angle of the third inner included angle 453 may be 80 °, 82 °, 84 °, 86 °, 88 ° or 90 °, the first inner included angle 433 is greater than the second inner included angle 443, and the second inner included angle 443 is greater than the third inner included angle 453, so that more light is reflected by the first lamp cup 43 and the second lamp cup 44, thereby reducing light loss, and making light reflected by the first lamp cup 43, the second lamp cup 44 and the center lamp cup 45 onto the diffusion plate 61 more uniform.

Referring to fig. 3 and 4, the angle between the adjacent first sidewalls 432 is the first angle 46, the angle between the adjacent second sidewalls 442 is the second angle 47, the angle between the third sidewalls 452 of the adjacent center lamp cups 45 is the third angle 48, the angle of the first angle 46 may be 115 °, 117 ° or 120 °, the angle of the second angle 47 may be 82 °, 84 °, 86 ° or 90 °, the angle of the third angle 48 may be 60 °, 64 °,68 ° or 70 °, the first angle 46 is greater than the second angle 47, and the second angle 47 is greater than the third angle 48, so that more light is reflected to the peripheral edge of the diffusion plate 61 at the first lamp cups 43 and the second lamp cups 44, so that the brightness of the peripheral edge on the diffusion plate 61 is the same as the brightness of the center of the diffusion plate 61, thereby improving the surface uniformity of light on the diffusion plate 61.

Referring to fig. 3 and 4, in the embodiment of the present application, the angle of the first inner included angle 433 is 149 °, the angle of the second inner included angle 443 is 133 °, the angle of the third inner included angle 453 is 123 °, the angle of the first included angle 46 is 118 °, the angle of the second included angle 47 is 86 °, and the angle of the third included angle 48 is 66 °, under which the reflection effect of the reflecting cover 40 formed by the first lamp cup 43, the second lamp cup 44 and the central lamp cup 45 is better, so that the surface uniformity of the light on the diffusion plate 61 is improved.

Referring to fig. 3, the height of the first lamp cup 43 is lower than the height of the second lamp cup 44, the height of the second lamp cup 44 is lower than the height of the central lamp cup 45, the height difference between the first lamp cup 43 and the second lamp cup 44 is equal to the height difference between the second lamp cup 44 and the central lamp cup 45, and the height difference may be 0.5mm, 0.7mm or 1.0mm, and the peripheral wall of the central lamp cup 45 is attached to the diffusion plate 61, thereby improving the phenomenon of light channeling between partitions, and restricting the outward diffusion of light at the central lamp cup 45, thereby making the light on the diffusion plate 61 more uniform.

Referring to fig. 3, the height of the first lamp cup 43 is 1.10mm, the height of the second lamp cup 44 is 1.80mm, and the height of the center lamp cup 45 is 2.50mm, so that the height difference in the embodiment of the present application is 0.7mm, and the light reflected by the reflecting cover 40 onto the diffusion plate 61 is more uniform.

The embodiment of the application provides a reflection cover structure with uniform light guide, which is implemented by the following principle: the heights of the first lamp cup 43, the second lamp cup 44 and the central lamp cup 45 are gradually reduced, the first inner included angle 433 is larger than the second inner included angle 443, the second inner included angle 443 is larger than the third inner included angle 453, the first included angle 46 is larger than the second included angle 47, and the second included angle 47 is larger than the third included angle 48, so that more light enters the peripheral edge of the diffusion plate 61, the brightness of the peripheral edge of the diffusion plate 61 is improved, and the uniformity of the whole surface of the backlight module is improved.

In a second aspect, an embodiment of the application discloses a backlight module.

Referring to fig. 5, the backlight module includes a die casting 10 and a middle iron frame 70, the die casting 10 and the middle iron frame 70 are clamped, the die casting 10 is disposed below the middle iron frame 70, the middle iron frame 70 and the die casting 10 form a placement space, a light plate 30, a reflective cover 40 and a backlight material 60 are sequentially disposed in the placement space from bottom to top, the light plate 30 is used as a light source to provide brightness, the reflective cover 40 reflects light emitted by the light plate 30, thereby reducing light loss, and the backlight material 60 is used for improving uniformity, brightness and the like of the light.

Referring to fig. 6, a plurality of LED lamps 31 are disposed on a lamp panel 30, lamp cups 42 are disposed on a reflecting cover 40, the LED lamps 31 are disposed in one-to-one correspondence with the lamp cups 42, a reflecting cover fixing adhesive 50 is disposed between the lamp panel 30 and the reflecting cover 40, and the reflecting cover fixing adhesive 50 is adhered to the lamp panel 30 to avoid the adverse phenomena such as loosening and falling of the reflecting cover 40, so that the problem of poor display effect of the backlight module caused by displacement is avoided.

Referring to fig. 6, a heat-conducting glue 20 is disposed between the lamp panel 30 and the die casting 10, and the LED lamp 31 on the lamp panel 30 generates heat when emitting light, and the heat generated by the LED lamp 31 is emitted through the heat-conducting glue 20, so as to avoid burning of the lamp panel 30 in the backlight module.

Referring to fig. 5, the backlight material 60 includes a diffusion plate 61, a light splitting film 62, a diffusion film 63, a lower intensifying film 64, a middle intensifying film 65 and a peep preventing film 66 sequentially disposed on the die casting 10 from bottom to top, and the diffusion plate 61 sufficiently diffuses light emitted from the LED lamp 31, so that light emitted from the backlight module is softer, and an irradiation effect of the backlight module is improved; the light splitting film 62 can reduce stray light and improve optical efficiency; the diffusion film 63 uniformly and outwardly emits the light separated by the light-splitting film 62; the lower and middle light enhancement films 64 and 65 enhance the light emitted from the diffusion film 63, thereby enhancing the optical effect of irradiation.

Referring to fig. 7, 8 and 9, the diffusion plate 61 includes an edge portion 611 and a center portion 612, the edge portion 611 is integrally provided with the center portion 612, the thickness of the edge portion 611 is lower than that of the center portion 612, wherein the thickness difference between the edge portion 611 and the center portion 612 is 0.3mm, and the transmittance of the edge portion 611 is improved by gradually decreasing the thickness from the center portion 612 to the edge portion 611, thereby improving the brightness at the edge portion 611 of the backlight module, and improving the surface uniformity and the overall image quality of the backlight module.

The implementation principle of the backlight module of the embodiment of the application is as follows: the reflective cover 40 with uniform light guide is matched with the diffusion plate 61, the thickness of the edge 611 of the diffusion plate 61 is lower than that of the center 612, so that light rays emitted by the LED lamps 31 on the lamp panel 30 are uniformly emitted out through the diffusion plate 61, and the light rays sequentially pass through the light splitting film 62, the diffusion film 63, the lower light enhancement film 64, the middle light enhancement film 65 and the peep-proof film 66 to filter stray light and enhance the light rays, thereby improving the overall surface uniformity of the backlight module and improving the overall image quality sense of the backlight module.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (8)

1. The backlight module is characterized by comprising a die casting (10) and a middle iron frame (70), wherein the die casting (10) is detachably connected with the middle iron frame (70), a lamp panel (30) and a diffusion plate (61) are sequentially arranged between the die casting (10) and the middle iron frame (70) from bottom to top, a reflecting cover (40) is arranged between the lamp panel (30) and the diffusion plate (61), and the reflecting cover (40) is used for controlling the divergence direction of light rays so that the light rays are led into the diffusion plate (61);

The reflecting cover (40) comprises a reflecting cover bottom plate (41) and a plurality of lamp cups (42) arranged on the reflecting cover bottom plate (41), the lamp cups (42) comprise a first lamp cup (43), a second lamp cup (44) and a central lamp cup (45), the first lamp cup (43) is arranged at the edge of the outermost layer of the reflecting cover bottom plate (41), the second lamp cup (44) is arranged adjacent to the first lamp cup (43), the central lamp cup (45) is arranged adjacent to the second lamp cup (44), the height of the first lamp cup (43) is lower than that of the second lamp cup (44), and the height of the second lamp cup (44) is lower than that of the central lamp cup (45);

the included angle between the adjacent first lamp cups (43) is a first included angle (46), the included angle between the adjacent second lamp cups (44) is a second included angle (47), the included angle between the adjacent central lamp cups (45) is a third included angle (48), the first included angle (46) is larger than the second included angle (47), and the second included angle (47) is larger than the third included angle (48);

The diffusion plate (61) comprises an edge part (611) and a central part (612), wherein the edge part (611) and the central part (612) are integrally arranged, and the thickness of the edge part (611) is lower than that of the central part (612).

2. The backlight module according to claim 1, wherein the first lamp cup (43) comprises a first side wall (432) and a first bottom wall (431), an included angle between the first side wall (432) and the first bottom wall (431) is a first inner included angle (433), the second lamp cup (44) comprises a second side wall (442) and a second bottom wall (441), an included angle between the second side wall (442) and the second bottom wall (441) is a second inner included angle (443), the center lamp cup (45) comprises a third side wall (452) and a third bottom wall (451), an included angle between the third side wall (452) and the third bottom wall (451) is a third inner included angle (453), the first inner included angle (433) is larger than the second inner included angle (443), and the second inner included angle (443) is larger than the third inner included angle (453).

3. A backlight module according to claim 1, wherein the first included angle (46) is between 115 ° and 120 °, the second included angle (47) is between 82 ° and 90 °, and the third included angle (48) is between 60 ° and 70 °.

4. The backlight module according to claim 2, wherein the first inner angle (433) is between 145 ° and 155 °, the second inner angle (443) is between 130 ° and 140 °, and the third inner angle (453) is between 80 ° and 90 °.

5. A backlight module according to claim 1, characterized in that the height difference between the first lamp cup (43) and the second lamp cup (44) is equal to the height difference between the central lamp cup (45) and the second lamp cup (44).

6. A backlight module according to claim 5, wherein the height difference between the first lamp cup (43) and the second lamp cup (44) is between 0.5mm and 1mm.

7. A backlight module according to claim 1, wherein a reflective cover fixing glue (50) is arranged between the reflective cover (40) and the lamp panel (30), and the reflective cover fixing glue (50) is used for reinforcing the fixation between the reflective cover (40) and the lamp panel (30).

8. The backlight module according to claim 1, wherein a plurality of LED lamps (31) are arranged on the lamp panel (30), lamp cups (42) are arranged on the reflecting cover (40), the LED lamps (31) are arranged in one-to-one correspondence with the lamp cups (42), heat-conducting glue (20) is arranged between the lamp panel (30) and the die casting (10), and the heat-conducting glue (20) is used for guiding out heat emitted by the LED lamps (31).