Backlight module and display equipment

Abstract

The invention discloses a backlight module and display equipment, and belongs to the technical field of display, the backlight module comprises a back plate, the opening end of the back plate is bent inwards to form a first containing groove and a second containing groove which are opposite to each other, the first containing groove is close to the ground side of the display equipment, and the second containing groove is close to the sky side of the display equipment; the diffusion plate is assembled with the back plate through the first accommodating groove and the second accommodating groove; the optical film is assembled with the back plate through the first containing groove and the second containing groove, and the optical film is located on the side, away from the back plate, of the diffusion plate; the end, close to the second containing groove, of the optical film inclines in the direction close to the back plate, so that when the display device is vertically placed, the included angle alpha formed between the optical film and the vertical direction is larger than 0 degree and smaller than or equal to 3 degrees. According to the display panel, the technical problem that the optical film and the display panel are easily scratched is solved through the back-leaning design of the diffusion plate and the optical film.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to a backlight module and a display device. Background Art

[0002] The F-shaped bending structure design of the direct-lit backlight module is currently a mainstream full-screen design method. However, this F-shaped bending structure design has certain design defects. That is, the diffusion plate and the optical film have a large activity space, and the optical film is very likely to come into contact with the lower polarizing film of the liquid crystal panel in a slapping manner during transportation. The surface hardness of the optical film is pencil hardness H-2H, and the hardness of the lower polarizing film of the liquid crystal panel is pencil hardness 8B-10B. The hardness difference between the two is relatively large, and the lower polarizing film of the liquid crystal panel is easily scratched by the optical film, resulting in dark spots in the display picture. Summary of the Invention

[0003] The main purpose of this application is to provide a backlight module and a display device, aiming to solve the technical problem that the optical film and the liquid crystal panel are easily scratched during transportation, affecting the display picture quality.

[0004] To achieve the above object, this application provides a backlight module for a display device, including:

[0005] A backplane, the open end of the backplane is bent inward to form opposite first and second accommodating grooves. Among them, the first accommodating groove is close to the ground side of the display device, and the second accommodating groove is close to the sky side of the display device;

[0006] A diffusion plate, the diffusion plate is assembled with the backplane through the first and second accommodating grooves;

[0007] An optical film, the optical film is assembled with the backplane through the first and second accommodating grooves, and the optical film is located on the side of the diffusion plate away from the backplane;

[0008] One end of the optical film close to the second accommodating groove is inclined towards the direction close to the backplane, so that when the display device is placed vertically, the included angle α formed between the optical film and the vertical direction ranges from 0° < α ≤ 3°.

[0009] In some embodiments of this application, the inner distance of the first accommodating groove is less than the inner distance of the second accommodating groove, and the plane formed by the ends of the first and second accommodating grooves away from the backplane is parallel to the vertical direction, so that when the display device is placed vertically, the display panel of the display device is parallel to the vertical direction.

[0010] In some embodiments of the present application, the backlight module further includes a second limiting layer, which is received at one end of the second accommodating groove away from the backplane, and the second limiting layer is used to limit the movement ranges of the diffusion plate and the optical film in the second accommodating groove.

[0011] In some embodiments of the present application, the gap between the second limiting layer and the optical film is 3 mm - 5 mm.

[0012] In some embodiments of the present application, one side of the diffusion plate received in the first accommodating groove is fixed to one end of the first accommodating groove close to the backplane through a first limiting layer.

[0013] In some embodiments of the present application, when the display device is placed vertically, the range of the included angle α formed between the optical film and the vertical direction is 1.2° ≤ α ≤ 3°.

[0014] In some embodiments of the present application, the bottom of the backplane is used to receive the light sources arranged in an array. The bottom of the backplane includes a first area and a second area. The light mixing distance of the first area is greater than that of the second area. The first area includes a refractive lens and a smooth-surface reflective film, and the second area includes a reflective lens and a diffusive reflective film.

[0015] In some embodiments of the present application, the smooth-surface reflective film includes a first protective layer, a first intermediate bubble layer, and a second protective layer stacked.

[0016] In some embodiments of the present application, the diffusive reflective film includes a third protective layer, a second intermediate bubble layer, a fourth protective layer, and a diffusive particle layer stacked.

[0017] In addition, to achieve the above object, the present application further provides a display device, including the backlight module as described above and a display panel assembled with the backlight module.

[0018] The backlight module provided by the embodiment of the present application assembles the diffusion plate and the optical film to the backplane through the first accommodating groove and the second accommodating groove. One end of the optical film close to the second accommodating groove inclines towards the direction close to the backplane, so that when the display device is placed vertically, an included angle α greater than 0° and less than or equal to 3° can be formed between the optical film and the vertical direction. This included angle α can provide space for the rotation and springback of the optical film. During transportation, if the backlight module is affected by an external force, one end of the optical film close to the second accommodating groove can offset the external force by doing rotational work, thereby avoiding the flapping contact between the optical film and the lower polarizing film of the display panel, improving the problem of abrasion of the display panel, and ensuring the display picture quality. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present drawings or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present drawings. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is a schematic diagram of an F-shaped bending structure of a direct-lit backlight module in the related art;

[0021] Figure 2 It is a schematic diagram of the structure of a display device using a direct-lit backlight module;

[0022] Figure 3 It is a physical diagram of a bruise accident provided by an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the structure of a display device provided by an embodiment of the present application;

[0024] Figure 5 It is an analysis diagram of the forces on a diffusion plate and an optical film in different states provided by an embodiment of the present application;

[0025] Figure 6 It is a schematic diagram of the light mixing design of a backlight module provided by an embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of the structure of a smooth surface type reflective film provided by an embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the structure of a diffusive reflective film provided by an embodiment of the present application.

[0028] Explanation of reference numerals:

[0029] 10. Display device;

[0030] 100. Backlight module;

[0031] 110. Back plate; 111. First accommodating groove; 1111. First groove wall; 1112. Second groove wall; 1113. First groove bottom; 112. Second accommodating groove; 1121. Third groove wall; 1122. Fourth groove wall; 1123. Second groove bottom;

[0032] 120. Diffusion plate; 130. Optical film; 140. Light source;

[0033] 150. Lens; 151. Refractive lens; 152. Reflective lens;

[0034] 160. Reflective film; 161. Smooth surface type reflective film; 1611. First protective layer; 1612. First intermediate bubble layer; 1613. Second protective layer; 162. Diffusion type reflective film; 1621. Third protective layer; 1622. Second intermediate bubble layer; 1623. Fourth protective layer; 1624. Diffusion particle layer;

[0035] 170. PCB board; 181. First limiting layer; 182. Second limiting layer;

[0036] 200. Display panel.

[0037] The realization of the purpose of this application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0038] It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0039] Hereinafter, the embodiments of the backlight module and the display device of this application are specifically disclosed in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters are omitted and repeated descriptions of actually identical structures are omitted. This is to avoid the following descriptions from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the accompanying drawings and the following descriptions are provided for those skilled in the art to fully understand this application and are not intended to limit the subject matter described in the claims.

[0040] The "range" disclosed in this application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. Unless otherwise specified, the range defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 - 120 and 80 - 110 are listed for a specific parameter, ranges of 60 - 110 and 80 - 120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4 and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4 and 2 - 5. In this application, unless otherwise specified, the numerical range "a - b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" have been fully listed herein, and "0 - 5" is only an abbreviated representation of these numerical combinations. In addition, when it is stated that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0041] To make the above objects, features, and advantages of the present application more obvious and understandable, the technical solutions of the present application will be further described below with reference to the accompanying drawings and embodiments. However, the present application is not limited to the listed embodiments and should also include any other well-known changes within the scope of the rights required by the present application.

[0042] Figure 1 FIG. 1 is a schematic diagram of an F-shaped bending structure of a direct-lit backlight module in the related art. As Figure 1 shown, the diffusion plate 120 and the optical film 130 are placed in the F-shaped bending groove formed by bending the backplane 110, and can be assembled by being pushed in from the ground-side opening. The display panel 200 is fixed on the top of the backplane 130 to achieve a full-screen design. Since structural components such as the middle frame and the front frame are saved, this design has a certain cost advantage.

[0043] Figure 2 FIG. 2 is a schematic diagram of the structure of a display device using a direct-lit backlight module. As Figure 2 shown, on the basis of the F-shaped integrated bending backplane design of the direct-lit backlight module, the diffusion plate 120 and the optical film 130 are parallel to the display panel 200 as a whole, and are designed with equal OD (optical distance, light mixing distance). The assembly gaps H at both ends of the optical film 130 are the same. However, the F-shaped bending structure design also has design defects. The lack of fixing measures for the diffusion plate 120 and the optical film 130 results in a large movement space. During transportation, the optical film 130 is extremely likely to contact the lower polarizing film of the display panel 200 in a slapping manner. The surface hardness of the optical film 130 is 1H - 2H in pencil hardness, and the hardness of the lower polarizing film of the display panel 200 is 8B - 10B in pencil hardness. The hardness difference between the two is relatively large, and the lower polarizing film of the display panel 200 is extremely likely to be scratched by the optical film 130, resulting in dark spots in the display image, as Figure 3 shown.

[0044] Based on this, an embodiment of the present application provides a backlight module 100, which is applied to a display device 10. Figure 4 FIG. 3 is a schematic diagram of the structure of a display device 10 provided by an embodiment of the present application. As Figure 4As shown in the figure, the display device 10 includes a backlight module 100 and a display panel 200. The backlight module 100 includes: a backplane 110, the open end of the backplane 110 is bent inward to form opposite first accommodation grooves 111 and second accommodation grooves 112. Among them, the first accommodation groove 111 is close to the ground side of the display device 10, and the second accommodation groove 112 is close to the sky side of the display device 10; a diffusion plate 120, the diffusion plate 120 is assembled with the backplane 110 through the first accommodation groove 111 and the second accommodation groove 112; an optical film 130, the optical film 130 is assembled with the backplane 110 through the first accommodation groove 111 and the second accommodation groove 112, and the optical film 130 is located on the side of the diffusion plate 120 away from the backplane 110; one end of the optical film 130 close to the second accommodation groove 112 is inclined towards the direction close to the backplane 110, so that when the display device 10 is placed vertically, the range of the angle α formed between the optical film 130 and the vertical direction is 0° < α ≤ 3°.

[0045] In this embodiment, the backlight module 100 is a structure that provides a surface light source with appropriate and uniform brightness for the display device 10. The backplane 110 is the main structure of the backlight module 100 and can be used to support and accommodate other internal functional components.

[0046] The main function of the diffusion plate 120 is to make the light received by the display panel 200 more uniform. The diffusion plate 120 can be made of a material with high transmittance. Atomization structures can be provided on both surfaces of the diffusion plate 120, and scattering particles with the function of changing the light propagation direction can be included inside the diffusion plate 120. Optionally, the light emitted by the light source 140 reaches the diffusion plate 120, is diffusely reflected by the atomization structure on one surface, and uniformly enters the diffusion plate 120. In the diffusion plate 120, the propagation direction is changed by the refraction or total reflection of the scattering particles, and then uniformly exits through the atomization structure on the other surface.

[0047] The main function of the optical film 130 is to increase the brightness. The light emitted by the light source 140 reaches the optical film 130 after passing through the diffusion plate 120. The optical film 130 can converge the uniform light emitted from the diffusion plate 120 within the frontal viewing angle range to increase the axial brightness.

[0048] In this embodiment, the backplane 110 is designed with an F-shaped bending structure. The open end of the backplane 110 can be integrally bent inward to form an F-shaped structure, and the opposite two sides respectively form a first accommodating groove 111 and a second accommodating groove 112. The openings of the first accommodating groove 111 and the second accommodating groove 112 are arranged opposite to each other. It can be understood that during the transportation process, the display device 10 is generally placed vertically, that is, the display panel 200 is perpendicular to the ground. Then, there are different distance relationships between the first accommodating groove 111 and the second accommodating groove 112 and the ground. In this embodiment, the one closer to the ground side is designated as the first accommodating groove 111, and the one closer to the sky side is designated as the second accommodating groove 112. The first accommodating groove 111 and the second accommodating groove 112 are structures formed by bending the backplane 110, and can be used for assembling the diffusion plate 120 and the optical film 130, as well as assembling the display panel 200. It can be understood that when the display device 10 is placed vertically and facing the display panel 200, the sky side is the upper side of the backplane 110, and the ground side is the lower side of the backplane 110. The left and right sides of the backplane 110 can refer to the above settings of the sky side and the ground side, and accommodate the diffusion plate 120 and the optical film 130 through a groove structure, so that the optical film 130 forms an angle α with the vertical direction. In another embodiment, the left and right sides of the backplane 110 can also be suspended.

[0049] The first receiving groove 111 includes a first groove wall 1111 and a second groove wall 1112 arranged in parallel. The first groove wall 1111 is located on the side close to the bottom of the back plate 110, and the second groove wall is located on the side away from the bottom of the back plate 110. The second receiving groove 112 includes a third groove wall 1121 and a fourth groove wall 1122 arranged in parallel. The third groove wall 1121 is located on the side close to the bottom of the back plate 110, and the fourth groove wall 1122 is located on the side away from the bottom of the back plate 110. The surfaces of the first groove wall 1111 and the third groove wall 1121 away from the bottom of the back plate 110 are assembly surfaces for assembling the diffusion plate 120 and the optical film 130, restricting the diffusion plate 120 and the optical film 130 at the ground side end between the first groove wall 1111 and the second groove wall 1112, and restricting the diffusion plate 120 and the optical film 130 at the sky side end between the third groove wall 1121 and the fourth groove wall 1122. The surfaces of the second groove wall 1112 and the fourth groove wall away from the bottom of the back plate 110 are assembly surfaces for assembling the display panel 200. The first groove wall 1111 and the second groove wall 1112 are connected by a first groove bottom 1113, and the first groove wall 1111 and the second groove wall 1112 can be perpendicular or at an angle to the first groove bottom 1113. The third groove wall 1121 and the fourth groove wall 1122 are connected by a second groove bottom 1123, and the third groove wall 1121 and the fourth groove wall 1122 can be perpendicular or at an angle to the second groove bottom 1123. One end of the first groove bottom 1113 connecting the second groove wall 1112 can exceed the surface of the second groove wall 1112 away from the bottom of the back plate 110 by a certain height for restricting the position of the display panel 200. One end of the second groove bottom 1123 connecting the fourth groove wall 1122 can exceed the surface of the fourth groove wall 1122 away from the bottom of the back plate 110 by a certain height for restricting the position of the display panel 200.

[0050] In the related art, when the display device 10 is placed vertically, the display panel 200, the diffusion plate 120, and the optical film 130 are all parallel to the vertical direction. In the embodiment of the present application, one end of the optical film 130 close to the second receiving groove 112 is inclined towards the direction close to the back plate 110. The optical film 130 is no longer parallel to the vertical direction but forms an included angle α, and 0° < α ≤ 3°, such that the distance between the optical film 130 at the sky side end and the display panel 200 is greater than the distance between the optical film 130 at the ground side end and the display panel 200, and the optical film 130 is in a reclined state. The diffusion plate 120 and the optical film 130 close to the sky side end can move within the limit range of the second receiving groove 112 to offset the action of external forces.

[0051] Figure 5 FIG. is a force analysis diagram of the diffusion plate 120 and the optical film 130 in different states, where the diffusion plate 120 and the optical film 130 are analyzed as a whole. Figure 5In the left figure, the diffusion plate 120 and the optical film 130 are arranged in parallel with the display panel 200. When placed vertically, the overall angle with the vertical direction is 0°. During transportation, it will be subjected to forces from different directions transmitted from the outside. The external force is simplified to a vibration force F obliquely upward. Let the angle between F and the horizontal direction be a. Then F can be decomposed into a vertical component force F1 and a horizontal component force F2. Among them, F1 = F * sina, which balances the gravity G of the diffusion plate 120 and the optical film 130, and F2 = F * cosa. This component force F2 can pull the diffusion plate 120 and the optical film 130 to swing back and forth and beat the display panel 200, resulting in abrasion.

[0052] Figure 5 In the right figure, it shows that the diffusion plate 120 and the optical film 130 are in a reclined state in the embodiment of the present application. Let the overall reclined angle be b. During transportation, it will also be subjected to an obliquely upward vibration force F transmitted from the outside. F will pull the diffusion plate 120 and the optical film 130 to rotate and do work W = F * cos(a - b) * h * b, where h is the total width of the diffusion plate 120 and the optical film 130. It can be seen that the rotation and rebound of the diffusion plate 120 and the optical film 130 can continuously consume the vibration force F during transportation, thereby improving the problem of panel abrasion.

[0053] In the backlight module 100 of the embodiment of the present application, the diffusion plate 120 and the optical film 130 are assembled to the back plate 110 through the first accommodation groove 111 and the second accommodation groove 112. One end of the optical film 130 close to the second accommodation groove 112 is inclined towards the back plate 110. When the display device 10 is placed vertically, an angle α greater than 0° and less than or equal to 3° can be formed between the optical film 130 and the vertical direction. This angle α can provide space for the rotation and rebound of the optical film 130. During transportation, if the backlight module 100 is subjected to an external force, one end of the optical film 130 close to the second accommodation groove 112 can offset the external force by rotating and doing work, thereby avoiding the beating contact between the optical film 130 and the lower polarizing film of the display panel 200, improving the abrasion problem of the display panel 200, and ensuring the display picture quality.

[0054] In some embodiments of the present application, the inner distance of the first receiving groove 111 is smaller than the inner distance of the second receiving groove 112. The plane formed by the ends of the first receiving groove 111 and the second receiving groove 112 away from the back plate 110 is parallel to the vertical direction. When the display device 10 is placed vertically, the display panel 200 of the display device 10 is parallel to the vertical direction. The inner distance of the groove refers to the distance between two opposite surfaces of the groove wall. The inner distance of the first receiving groove 111 is the distance between the surface of the first groove wall 1111 away from the bottom of the back plate 110 and the surface of the second groove wall 1112 close to the bottom of the back plate 110. The inner distance of the second receiving groove 112 is the distance between the surface of the third groove wall 1121 away from the bottom of the back plate 110 and the surface of the fourth groove wall 1122 close to the bottom of the back plate 110. In order to form a certain angle α between the optical film 130 and the vertical direction, the process of bending the back plate 110 can be adjusted so that the inner distance of the first receiving groove 111 is smaller than the inner distance of the second receiving groove 112. In order to maintain the state where the display panel 200 is parallel to the vertical direction, the second groove wall 1112 and the fourth groove wall 1122 are aligned. Due to the different inner distances of the grooves, the third groove wall 1121 extends out a part compared with the first groove wall 1111, so that after the diffusion plate 120 and the optical film 130 are assembled, a backward tilt posture is formed, forming an included angle α that meets the requirements of the angle range.

[0055] By controlling the difference in the inner distance of the groove in the bending process, the optical film 130 is in a backward tilt state. Without changing the assembly method of the optical film 130, the diffusion plate 120 and the display panel 200, the advantage of convenient assembly of the back plate design can be continued.

[0056] In some embodiments of the present application, the backlight module 100 further includes a second limiting layer 182. The second limiting layer 182 is received at the end of the second receiving groove 112 away from the back plate 110. The second limiting layer 182 is used to limit the movement range of the diffusion plate 120 and the optical film 130 in the second receiving groove 112. The second limiting layer 182 can be disposed on the surface of the fourth groove wall 1122 close to the bottom of the back plate 110. Therefore, the diffusion plate 120 and the optical film 130 are limited within the movement range between the surface of the third groove wall 1121 away from the bottom of the back plate 110 and the second limiting layer 182. The second limiting layer 182 can be a foam rubber strip. The surface of the foam rubber strip is relatively soft, and a certain buffer can also be formed when it collides with the optical film 130, avoiding damage.

[0057] Compared with the case where the second receiving groove 112 does not have the second limiting layer 182, in the embodiment of the present application, the movement range of the diffusion plate 120 and the optical film 130 is smaller, and the boundary position that the optical film 130 can reach on the side away from the back plate 110 is farther from the display panel 200, thereby further reducing the risk of abrasion between the optical film 130 and the display panel 200.

[0058] In some embodiments of the present application, the gap between the second limiting layer 182 and the optical film 130 is 3 mm - 5 mm. For example, the gap between the second limiting layer 182 and the optical film 130 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. The size setting of the gap can be achieved by changing the thickness of the second limiting layer 182. The greater the thickness of the second limiting layer 182, the smaller the formed gap.

[0059] Through reasonable gap setting, the diffuser plate 120 and the optical film 130 can not only move within the range restricted by the second limiting layer 182 and the third groove wall 1121, but also reduce the probability of the diffuser plate 120 and the optical film 130 colliding violently with the third groove wall 1121 at the boundary position under external force vibration due to an overly large gap.

[0060] In some embodiments of the present application, one side of the diffuser plate 120 received in the first receiving groove 111 is fixed to one end of the first receiving groove 111 close to the back plate 110 through the first limiting layer 181. The function of the first limiting layer 181 is to fix the position of the diffuser plate 120. The first limiting layer 181 can be a double-sided adhesive or a cured glue layer. Optionally, also in order to enable the diffuser plate 120 and the optical film 130 to form a reclined posture, a first limiting layer 181 with a relatively large thickness can be provided, and the diffuser plate 120 and the optical film 130 at the ground side end are lifted by the first limiting layer 181 to form an included angle α.

[0061] By using the first limiting layer 181 to fix the position of the diffuser plate 120 at the ground side end, when the display device 10 is subjected to an external force, the diffuser plate 120 at the sky side end can move within a certain restricted range. Thus, the diffuser plate 120 can rotate to do work to offset the action of the external force, and the movement of the diffuser plate 120 drives the rotation of the optical film 130, reducing the risk of abrasion.

[0062] In some embodiments of the present application, when the display device 10 is placed vertically, the range of the angle α formed between the optical film 130 and the vertical direction is 1.2° ≤ α ≤ 3°. For example, the angle α formed between the optical film 130 and the vertical direction can be 1.2°, 1.5°, 1.7°, 1.9°, 2.2°, 2.4°, or 3°, etc. Since a certain angle α is formed between the diffusion plate 120 and the vertical direction, the light mixing distance of the backlight module 100 in the embodiments of the present application is not equal everywhere. The light mixing distance refers to the distance between the surface of the diffusion plate 120 close to the back plate 110 and the surface of the PCB board 170 far from the back plate 110. That is, the light mixing distance of the backlight module 100 is affected by the size of the angle α formed between the diffusion plate 120 and the vertical direction. Different light mixing distances will affect the overall display effect. If the angle α is too small, the optical film 130 and the display panel 200 tend to be in a parallel state, increasing the risk of abrasion. If the angle α is too large, the difference in the light mixing distance between different positions in the backlight module 100 is too large, making it difficult to mix light and resulting in a decline in the quality of the display screen. In order to maintain the overall display effect, the difference between the maximum value and the minimum value of the light mixing distance of the backlight module 100 can be set within 20.6 mm, so that the angle α satisfies the condition of 1.2° ≤ α ≤ 3°, which can effectively prevent abrasion and obtain good display screen quality.

[0063] In the embodiments of the present application, the PCB board 170 is parallel to the vertical direction. Based on the surface of the PCB board 170 far from the back plate 110, the maximum value of the light mixing distance appears at the diffusion plate 120 at the ground side end, and the minimum value of the light mixing distance appears at the diffusion plate 120 at the sky side end. That is, the difference in the light mixing distance can be controlled by controlling the size of the angle α. The sizes of the diffusion plates 120 used for different-sized display panels 200 are also different. The distance between the sky side and the ground side of the large-sized display panel 200 is large, and the corresponding backward tilt angle can be smaller. In order to control the difference in the light mixing distance between the sky side and the ground side of the diffusion plate 120 and ensure the display screen quality, the corresponding relationship between the backward tilt angle and the display product size (inch) shown in Table 1 below can be referred to for setting. Here, the OC height refers to the height of the display panel, and the unit is mm. For example, according to Table 1, the backward tilt angle of the 32-inch display product is set to 3°, and the backward tilt angle of the 75-inch display product is set to 1.2°.

[0064] Table 1

[0065]

[0066] Figure 6 Schematic diagram of the light mixing design of the backlight module provided by the embodiments of the present application, referring to Figure 6In some embodiments of the present application, the bottom of the back panel 110 is used to accommodate the light sources 140 arranged in an array. The bottom of the back panel 110 includes a first area S1 and a second area S2. The light mixing distance of the first area S1 is greater than the light mixing distance of the second area S2. The first area S1 includes a refractive lens 151 and a smooth reflective film 161, and the second area S2 includes a reflective lens 152 and a diffuse reflective film 162. The position of the dividing line between the first area S1 and the second area S2 can be determined first, and the position of the dividing line is marked on the bottom of the back panel 110. The dividing line divides the area on the side close to the ground as the first area S1, and the area on the side close to the sky as the second area S2. Combined with Figure 4 , Figure 4 The OD2 near the ground is greater than the OD1 near the sky. It is understandable that the size of the light mixing distance has a certain influence on the light mixing effect. If the light mixing distance is too small, it is easy to cause uneven brightness and local areas that are too bright or too dark. A sufficient light mixing distance allows the light to have sufficient time and space to mix, reducing the problem of uneven brightness. Based on the backward design of the embodiment of the present application, different light mixing methods can be designed for areas with different light mixing distances to make the overall display brightness uniform.

[0067] For the first area S1, the light mixing distance is relatively sufficient, and the low-cost refractive lens 151 and the smooth reflective film 161 can be used. The light emitted by the light source 140 is mainly propagated upward after being diverged by the refractive lens 151. The reflective sheet only needs the most basic light energy recovery effect, so the smooth reflective film 161 is used. For the second area S2, the light mixing distance is smaller, and the reflective lens 152 and the diffusion reflective film 162 can be used. The light emitted by the light source 140 is mainly propagated downward after passing through the reflective lens 152, and then the diffuse reflection effect of the diffusion reflective film 162 expands the angle.

[0068] In this way, different light mixing methods are used in combination with different light mixing distances, which can not only make the overall display brightness uniform, but also take into account the control of costs.

[0069] In some embodiments of the present application, the critical value of the light mixing distance between the first area S1 and the second area S2 is 25 mm-30 mm. For example, the critical value of the light mixing distance can be 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, etc. Figure 6 The position corresponding to the critical value of the light mixing distance can be used as the boundary between the first area S1 and the second area S2. Figure 6The critical value corresponding to the middle dividing line is 25 mm. If the critical value is too large, the reflective lens 152 and the diffusive reflective film 162 are also used in some areas with sufficient light mixing distance, which will lead to an increase in cost and uneven brightness. If the critical value is too small, the refractive lens 151 and the smooth reflective film 161 are used in some areas with insufficient light mixing distance, resulting in insufficient light mixing effect in this part of the area and uneven brightness.

[0070] In some embodiments of the present application, referring to Figure 7 , Figure 7 is a schematic structural diagram of a smooth reflective film provided by an embodiment of the present application. The smooth reflective film 161 includes a first protective layer 1611, a first intermediate bubble layer 1612, and a second protective layer 1613 which are stacked. The smooth reflective film 161 can be a three-layer structure. The upper and lower first protective layer 1611 and second protective layer 1613 can both use polymer materials with a certain light transmittance such as PET (Polyethylene terephthalate). This reflective film mainly relies on the refractive index difference of the first intermediate bubble layer 1612 to achieve the reflection effect.

[0071] The structure of the smooth reflective film 161 is relatively simple, with a low cost while having a certain reflection effect, and is suitable for the first region S1 with a large light mixing distance in the embodiment of the present application.

[0072] In some embodiments of the present application, referring to Figure 8 , Figure 8 is a schematic structural diagram of a diffusive reflective film provided by an embodiment of the present application. The diffusive reflective film 162 includes a third protective layer 1621, a second intermediate bubble layer 1622, a fourth protective layer 1623, and a diffusive particle layer 1624 which are stacked. The diffusive reflective film 162 adds a diffusive particle layer 1624 on the basis of the three-layer structure. The diffusive particle layer 1624 includes diffusive particles in the micron level, and the material of the diffusive particles can be selected from PMMA (Poly(methyl methacrylate)), PS (Polystyrene), etc. The third protective layer 1621 and the fourth protective layer 1623 in the diffusive reflective film 162 can also use PET material.

[0073] The diffusive particles in the diffusive reflective film 162 can achieve a diffuse reflection effect, expand the angle of light propagation, and have a better light energy recovery effect than the smooth reflective film 161, and are suitable for the second region S2 with a small light mixing distance and higher light mixing requirements in the embodiment of the present application.

[0074] The embodiment of the present application also provides a display device 10, referring to Figure 4, including the backlight module 100 as described in the above embodiments, and a display panel 200 assembled with the backlight module 100. The backlight module 100 includes: a backplane 110, the open end of the backplane 110 is bent inward to form opposite first accommodation grooves 111 and second accommodation grooves 112, wherein, the first accommodation groove 111 is close to the ground side of the display device 10, and the second accommodation groove 112 is close to the sky side of the display device 10; a diffusion plate 120, the diffusion plate 120 is assembled with the backplane 110 through the first accommodation groove 111 and the second accommodation groove 112; an optical film 130, the optical film 130 is assembled with the backplane 110 through the first accommodation groove 111 and the second accommodation groove 112, and the optical film 130 is located on the side of the diffusion plate 120 away from the backplane 110; one end of the optical film 130 close to the second accommodation groove 112 is inclined towards the direction close to the backplane 110, so that when the display device 10 is placed vertically, the range of the included angle α formed between the optical film 130 and the vertical direction is 0° < α ≤ 3°. The display panel 200 can be assembled in the groove formed by bending the backplane 110, so that the display panel 200 maintains an upright form.

[0075] Since one end of the optical film 130 close to the second accommodation groove 112 is inclined towards the direction close to the backplane 110, when the display device 10 is placed vertically, the range of the included angle α formed between the optical film 130 and the vertical direction is 0° < α ≤ 3°. Combining Figure 4 , Figure 4 , the distance L2 between the surface of the optical film 130 on the side away from the backplane 110 at the end close to the ground side and the surface of the display panel 200 on the side close to the backplane 110 is less than the distance L1 between the surface of the optical film 130 on the side away from the backplane 110 at the end close to the sky side and the surface of the display panel 200 on the side close to the backplane 110. In a static state, the optical film 130 is in a reclined state, and there is a certain gap between the optical film 130 and the display panel 200. This gap can provide space for the position change of the optical film 130, so that even if the optical film 130 vibrates in a flapping manner under an external force and approaches the display panel 200, compared with the case where the optical film 130 and the display panel 200 are placed parallel to each other, the risk of abrasion between the two is lower, thereby ensuring the quality of the display screen.

[0076] It should be noted that the present application is not limited to the above embodiments. The above embodiments are only examples, and embodiments having the same composition and the same function and effect as the technical idea within the technical solution scope of the present application are all included in the technical scope of the present application. In addition, within the scope not departing from the gist of the present application, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways constructed by combining some constituent elements of the embodiments are also included in the scope of the present application.

Claims

1. A backlight module for a display device, characterized in that: include: A back plate, wherein the opening end of the back plate is bent inward to form a first accommodating groove and a second accommodating groove opposite to each other, wherein the first accommodating groove is close to the ground side of the display device, and the second accommodating groove is close to the sky side of the display device; a diffuser plate, the diffuser plate being assembled with the back plate through the first receiving groove and the second receiving groove; An optical film, the optical film is assembled with the back plate through the first containing groove and the second containing groove, and the optical film is located on a side of the diffuser away from the back plate; One end of the optical film close to the second receiving groove is inclined toward the back plate, so that when the display device is placed vertically, the angle α formed between the optical film and the vertical direction is in the range of 0°<α≤3°.

2. The backlight module according to claim 1, characterized in that: The in-groove spacing of the first accommodating groove is smaller than the in-groove spacing of the second accommodating groove, and the plane formed by the first accommodating groove and the second accommodating groove at one end away from the back plate is parallel to the vertical direction, so that when the display device is placed vertically, the display panel of the display device is parallel to the vertical direction.

3. The backlight module according to claim 2, characterized in that: The backlight module further includes a second limiting layer, which is received in one end of the second containing groove away from the back plate, and is used to limit the movement range of the diffusion plate and the optical film in the second containing groove.

4. The backlight module according to claim 3, characterized in that: The gap between the second limiting layer and the optical film is 3 mm-5 mm.

5. The backlight module according to claim 3, characterized in that: The diffusion plate is received in one side of the first containing groove and fixed to one end of the first containing groove close to the back plate through a first limiting layer.

6. The backlight module according to claim 1, wherein: When the display device is placed vertically, the angle α formed between the optical film and the vertical direction is in the range of 1.2°≤α≤3°.

7. The backlight module according to any one of claims 1 to 6, characterized in that: The bottom of the back panel is used to accommodate the light sources arranged in an array. The bottom of the back panel includes a first area and a second area. The mixing distance of the first area is greater than the mixing distance of the second area. The first area includes a refractive lens and a smooth reflective film, and the second area includes a reflective lens and a diffuse reflective film.

8. The backlight module according to claim 7, characterized in that: The glossy reflective film comprises a first protective layer, a first intermediate bubble layer and a second protective layer which are stacked.

9. The backlight module according to claim 7, wherein: The diffusion type reflective film includes a third protective layer, a second intermediate bubble layer, a fourth protective layer and a diffusion particle layer which are stacked.

10. A display device, characterized in that: The invention comprises the backlight module as claimed in any one of claims 1 to 9, and a display panel assembled with the backlight module.

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