Reflection structure, backlight module and display device

Abstract

The utility model discloses a reflection structure, a backlight module and a display device, the reflection structure is integrally formed by a reflection material and comprises a plurality of reflection grooves distributed in an array mode, and each reflection groove is suitable for containing at least one light source. The backlight module comprises a reflection structure, a light source module and a diffusion plate, the light source module comprises a plurality of light sources, the diffusion plate comprises a light inlet face and a plurality of containing grooves formed by sinking from the light inlet face to the interior of the diffusion plate, and each convex ridge is inserted into one containing groove. According to the application, the light source is arranged in the light reflecting groove, and the light can be collected in the area by utilizing the light reflecting groove, so that obvious diffusion of halo is avoided, and the light influence among the areas is reduced; besides, by forming the containing groove in the diffusion plate and inserting the convex ridge formed by folding the reflection structure into the containing groove, the reflection structure and the diffusion plate are embedded, the overall thickness can be further reduced, the structure is compact, and the light and thin development trend of current electronic products is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a reflection structure, a backlight module and a display device. BACKGROUND

[0002] The backlight module is one of the key components of the display panel, which is used to light up the display panel so that it can normally display images.

[0003] A direct type backlight module in the related art comprises a lamp plate, a light emitting device, a diffusion plate and a reflection sheet, wherein the light emitting device is mounted on the lamp plate, the light emitting device is arranged below the diffusion plate, and the reflection sheet is arranged below the light emitting device. The light emitted by the light emitting device is reflected by the reflection sheet, and the light is emitted through the diffusion plate. The direct type backlight module has the advantage of high brightness. However, for this structure, there are problems of obvious LED halo diffusion and mutual influence of light between regions.

[0004] Therefore, the current technology needs to be improved and enhanced. Content of the utility model

[0005] The present application provides a reflection structure, a backlight module and a display device, which can effectively solve the problem of large thickness of the direct type backlight module.

[0006] The present application provides a reflection structure applied to a backlight module, wherein the backlight module comprises a light source module, the light source module comprises a plurality of light sources, the reflection structure is integrally formed by a reflection material and comprises a plurality of reflection grooves arranged in an array, and each reflection groove is adapted to accommodate at least one light source.

[0007] In some embodiments, the reflection material is reflection paper.

[0008] In some embodiments, the reflection groove is a conical groove.

[0009] A backlight module comprises:

[0010] A light source module comprising a plurality of light sources;

[0011] The reflection structure described above, wherein a ridge is formed between each two adjacent reflection grooves;

[0012] A diffusion plate comprising an incident surface and a plurality of accommodation grooves formed by recessing inward from the incident surface, and each ridge is inserted into one accommodation groove.

[0013] In some embodiments, the light source module further comprises a lamp plate and a plurality of driving devices arranged above the lamp plate, and each driving device drives a plurality of light sources.

[0014] The reflective structure is disposed above the lamp panel, and each ridge and the lamp panel enclose a cavity, and each cavity contains a plurality of driving devices.

[0015] In some embodiments, each light reflection groove comprises a bottom wall and a circumferential side wall enclosing the bottom wall, and the bottom wall is provided with an opening, and the light source is disposed through the opening and connected with the lamp panel.

[0016] In some embodiments, the diffusion plate further comprises a light exit surface and a plurality of light blocking grooves recessed from the light exit surface to the inside thereof, and each light blocking groove is opposite to and spaced apart from the position of one receiving groove.

[0017] In some embodiments, the depth of each light blocking groove and the depth of the corresponding receiving groove are less than or equal to 60% of the thickness of the diffusion plate.

[0018] In some embodiments, the diffusion plate further comprises a light exit surface, and the light exit surface and / or the light entrance surface is provided with an anti-reflection film layer.

[0019] In some embodiments, each ridge has an assembly gap between the inner wall of the corresponding receiving groove.

[0020] In some embodiments, the backlight module further comprises a plurality of adhesive members, and each ridge is attached to the inner wall of the corresponding receiving groove through a plurality of adhesive members.

[0021] In some embodiments, the ridge comprises a top wall away from the light reflection groove, and the adhesive member is attached to the top wall.

[0022] In some embodiments, the surface of the ridge and / or the receiving groove adapted to be attached to the adhesive member is a rough surface.

[0023] In some embodiments, the depth of the receiving groove is less than or equal to 60% of the thickness of the diffusion plate.

[0024] In some embodiments, the receiving groove is a tapered groove.

[0025] A display device comprising the backlight module or the reflective structure described above.

[0026] The application provides a reflective structure, a backlight module and a display device. The reflective structure is integrally formed by a reflective material to form a plurality of light reflection grooves. A light source is arranged in the light reflection groove. The light reflection groove reflects the light emitted by the light source. The light is concentrated in the area where the light source is located. The light halo is prevented from being obviously diffused. The influence of the light between the areas is reduced. In addition, the backlight module has a receiving groove formed on a diffusion plate. The convex ridge formed by folding the reflective structure is inserted into the receiving groove. The reflective structure is embedded with the diffusion plate. The backlight module can further reduce the overall thickness under the premise of ensuring the light emission effect. The structure is compact. The backlight module meets the development trend of the current electronic product lightening and thinning. BRIEF DESCRIPTION OF DRAWINGS

[0027] The technical scheme and other beneficial effects of the application will be apparent from the following detailed description of the specific embodiments of the application with reference to the accompanying drawings.

[0028] Figure 1 A structural schematic view of the reflective structure provided by the embodiments of the application.

[0029] Figure 2 Another structural schematic view of the reflective structure provided by the embodiments of the application.

[0030] Figure 3 A structural schematic view of the backlight module provided by the embodiments of the application.

[0031] Figure 4 An exploded view of the backlight module. Figure 3

[0032] A sectional view of the backlight module along the A-A direction. Figure 5 Figure 3 A structural schematic view of the diffusion plate provided by the embodiments of the application.

[0033] Figure 6 Another structural schematic view of the diffusion plate provided by the embodiments of the application.

[0034] Figure 7 Explanation of reference signs:

[0035] 10, backlight module;

[0036] 10, backlight module;

[0037] 100, reflective structure; 200, light source module; 300, diffusion plate; 400, adhesive member;

[0038] 110, light reflection groove; 120, convex ridge; 130, cavity; 210, light source; 220, lamp plate; 230, driving device; 310, light inlet surface; 320, receiving groove; 330, light outlet surface; 340, light blocking groove; ​

[0039] 121. top wall. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0041] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, so that the features with "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0042] The embodiments of the present application provide a reflective structure, which is applied to a backlight module. For example, please refer to Figure 1 , Figure 1 The structural schematic diagram of the reflective structure provided by the embodiments of the present application is shown. The backlight module includes a light source module, and the light source module includes a plurality of light sources. The reflective structure 100 is integrally formed by a reflective material and includes a plurality of light reflection grooves 110 arranged in an array. Each light reflection groove 110 is adapted to accommodate at least one light source.

[0043] Among them, the light source is used to emit light, and the inner wall of the light reflection groove 110 can reflect the light emitted by the light source. Optionally, as Figure 1 shown, each light reflection groove 110 accommodates a corresponding light source, and the plurality of light reflection grooves are arranged in a matrix. Each light reflection groove 110 provides an independent light emitting cavity for a light source. In other embodiments, please refer to Figure 2 , Figure 2 The structural schematic diagram of another reflective structure provided by the embodiments of the present application is shown. Each light reflection groove 110 is a long strip-shaped light reflection groove, and the plurality of light reflection grooves 110 are arranged in a linear array, that is, the plurality of long strip-shaped light reflection grooves 110 extend longitudinally and are arranged in sequence in the transverse direction. Each light reflection groove 110 accommodates a plurality of light sources, and the plurality of light sources in each light reflection groove 110 are adapted to be arranged in sequence and spaced apart in the longitudinal direction of the light reflection groove 110.

[0044] As for the material of the reflective structure 100, the reflective material can be a reflective paper, for example, the reflective structure 100 is integrally formed by a reflective paper sheet through a plastic suction processing technology. In other embodiments, the reflective material can also be a reflective plating layer or a reflective coating layer, and the reflective plating layer or the reflective coating layer can contain aluminum, silver, optical-grade polymers and other substances with light reflection properties.

[0045] Optionally, the light-reflecting groove 110 is a conical groove, for example, a quadrangular pyramid type groove or a circular cone type groove. In this way, the light-reflecting groove is conducive to converging the light rays to the central region, improving the utilization of the light rays, and improving the distribution of the light rays.

[0046] The reflective structure 100 provided by the embodiments of the present application is integrally formed by using a reflective material to form a plurality of light-reflecting grooves 110. By arranging the light source in the light-reflecting groove, the light-reflecting groove 110 is used to reflect the light rays emitted by the light source, so that the light rays generated by the light source are converged in the local region, the significant diffusion of the light halo is avoided, the influence of the light rays between the regions is reduced, the utilization of the light rays is improved, and the distribution of the light rays on the light guide plate or the diffusion plate is improved, so that the light rays are uniformly dispersed to the entire backlight region, the appearance of the dark and bright regions is reduced, and the uniformity and the overall brightness of the backlight are improved.

[0047] The embodiments of the present application also provide a backlight module. For example, refer to Figures 3-5 , Figure 3 The backlight module provided by the embodiments of the present application is shown in a structural schematic diagram, Figure 4 is Figure 3 the backlight module is shown in an exploded view, Figure 5 is Figure 3 the backlight module is shown in a sectional view along the A-A direction. The backlight module 10 includes the reflective structure 100, the light source module 200, and the diffusion plate 300.

[0048] The light source module 200 includes a plurality of light sources 210; the reflective structure 100 includes a plurality of light-reflecting grooves 110, and a ridge 120 is formed between each two adjacent light-reflecting grooves 110; each light-reflecting groove 110 contains at least one light source 210; the diffusion plate 300 includes a light-incident surface 310 and a plurality of containing grooves 320 formed in the light-incident surface 310; and each ridge 120 is inserted into one containing groove 320.

[0049] The light source 210 is used to emit light rays, the surface of the light-reflecting groove 110 has the characteristic of reflecting the light rays, and the diffusion plate 300 is used to diffuse the light rays. After the light rays emitted by the light source 210 are converged by the light-reflecting groove 110, the utilization of the light rays is improved, and the distribution of the light rays on the diffusion plate 300 is improved, so that the problem of the bright spot generated by the light rays concentrated directly above the light source 210 is avoided, and the uniformity of the light emitted by the backlight module is improved. The diffusion plate 300 is used to diffuse the light rays. After the light rays emitted by the light source 210 and the light rays reflected by the light-reflecting groove 110 pass through the diffusion plate, the uniformity and softness of the light emitted by the backlight module are further improved.

[0050] It should be noted that the diffusion plate 300 needs to be spaced apart from the light source 210 to ensure that no contact friction is caused to the light source 210. For example, the diffusion plate 300 is spaced apart from the light source 210 by more than 0.1 cm.

[0051] The light source 210 includes, for example, an LED chip as the core of the light source module, which is made of a semiconductor material and can emit light when powered on, and a lens for improving the propagation direction of light. It should be noted that the light source module 200 usually also includes a lamp plate for carrying the light source 210, a driving IC of the light source 210, a heat dissipation member, and the like, which can be arranged in the light reflection groove 110 or outside the light reflection groove 110.

[0052] The backlight module 10 provided by the embodiment of the present application can make the light generated by the light source converge in the region, avoid the obvious diffusion of the light halo, reduce the influence of light between regions, thereby improving the utilization rate of light, helping to improve the distribution of light on the diffusion plate, so that the light is uniformly dispersed to the entire backlight region, and the appearance of dark and bright areas can be reduced, and the uniformity and overall brightness of the backlight can be improved. In addition, by providing the accommodating groove 320 on the diffusion plate 300 and inserting the convex ridge 120 formed by the reflection structure 100 into the accommodating groove 320, the reflection structure 100 is embedded with the diffusion plate 300. Compared with the existing backlight structure in which the flat diffusion plate is directly stacked above the reflection structure 100, the backlight module 10 of the present application can further reduce the overall thickness under the premise of ensuring the light output effect, and the structure is compact, which meets the development trend of thin and light electronic products.

[0053] In some embodiments, the light source module 200 further includes a lamp plate 220 and a plurality of driving devices 230 arranged above the lamp plate 220, each driving device 230 driving at least one light source 210; the reflection structure 100 is arranged above the lamp plate 220, and each convex ridge 120 and the lamp plate 220 form a cavity 130, and each cavity 130 accommodates at least one driving device 230.

[0054] The lamp plate 220 is used to carry the light source 210. The plurality of driving devices 230 and the plurality of light sources 210 can be electrically connected one by one, so that each driving device 230 is used to drive a corresponding light source 210; alternatively, one driving device 230 can be electrically connected with a plurality of light sources 210, so that each driving device 230 is used to drive a corresponding plurality of light sources 210. The specific implementation manner can be determined by the designer according to the actual application scene of the backlight module 10.

[0055] The lamp plate 220 is also used to carry the driving device 230. By hiding the driving device 230 in the cavity 130 formed by the ridge 120 and the lamp plate 220, the driving device 230 can be isolated from the light source 210, so that the existence of the driving device 230 does not affect the light pattern of the light source 210, thereby ensuring the uniformity of the light emitted by the backlight module 10 and improving the visual effect of the product.

[0056] Optionally, each reflecting groove 110 includes a bottom wall and a circumferential side wall surrounding the bottom wall, and the bottom wall is provided with a gap, and the light source 210 is arranged in the gap and connected with the lamp plate 220. In this way, the complexity of the structure of the backlight module 10 can be reduced.

[0057] In some embodiments, the surface of the lamp plate 220 away from the light source 210 is also coated with a heat dissipation coating, and a heat dissipation groove can also be formed on the side of the lamp plate 220 away from the light source 210, so as to improve the heat dissipation capacity of the light source module 200.

[0058] In some embodiments, please refer to Figure 6 , Figure 6 A structure diagram of the diffusion plate provided by the embodiments of the present application is shown. The accommodating groove 320 formed on the diffusion plate 300 is matched with the shape of the ridge 120. For example, the accommodating groove 320 is a conical groove such as a quadrangular pyramid-shaped groove. In order to facilitate the insertion of the ridge 120 into the accommodating groove 320, a guide inclined surface can also be arranged in the accommodating groove 320.

[0059] In order to ensure the structural strength of the diffusion plate 300, the depth of the accommodating groove 320 can be set to be less than or equal to 60% of the thickness of the diffusion plate 300. In this way, the thickness of the bottom of the accommodating groove 320 can be ensured to be qualified, and the problem that the diffusion plate 300 is easily damaged can be avoided, so that the overall thickness of the backlight module 10 is reduced while the quality of the backlight module 10 is ensured. For example, the thickness of the diffusion plate 300 is 2mm, and the depth of the accommodating groove 320 is 0.5mm; or the thickness of the diffusion plate 300 is 5mm, and the depth of the accommodating groove 320 is 3mm.

[0060] In addition, in order to reduce the difficulty of assembling the diffusion plate 300 and the reflecting structure 100 and improve the assembly efficiency, an assembly gap can be arranged between each ridge 120 and the inner wall of the corresponding accommodating groove 320. In this way, the situation that the ridge 120 cannot be normally inserted into the accommodating groove 320 due to process reasons and the like can be reduced, so that the assembly of the diffusion plate 300 and the reflecting structure 100 is difficult.

[0061] In some embodiments, please refer to Figure 7 , Figure 7A cross-sectional view of the diffusion plate is provided in the embodiments of the present application. The diffusion plate 300 further comprises a light-out surface 330 and a plurality of light-blocking grooves 340 formed in the light-out surface 330 and recessed inwardly from the light-out surface 330. Each of the light-blocking grooves 340 is opposite to and spaced apart from a position of the accommodating groove 320. The light-blocking grooves 340 are used to prevent the light in the adjacent light-reflecting grooves 110 from crossing and propagating, thereby avoiding the mutual influence of the light and reducing the uniformity of the light-out of the backlight module 10.

[0062] For the diffusion plate 300 provided with the light-blocking grooves 340, preferably, the sum of the depth of each of the light-blocking grooves 340 and the depth of the corresponding accommodating groove 320 is less than or equal to 60% of the thickness of the diffusion plate 300. In this way, the thickness of the bottom of the accommodating groove 320 can be guaranteed, and the problem of the diffusion plate 300 being easily damaged can be avoided. The overall thickness of the backlight module 10 can be reduced while the quality of the backlight module 10 is guaranteed. For example, the thickness of the diffusion plate 300 is 2 mm, and the sum of the depth of the accommodating groove 320 and the depth of the light-blocking groove 340 is 1 mm. Alternatively, the thickness of the diffusion plate 300 is 5 mm, and the sum of the depth of the accommodating groove 320 and the depth of the light-blocking groove 340 is 3 mm.

[0063] In order to reduce the loss of the light when passing through the diffusion plate 300 and improve the overall light-out brightness of the backlight module 10, a transparent film layer can be additionally provided on the light-out surface 330 and / or the light-in surface 310 of the diffusion plate 300. In this way, the light transmittance of the diffusion plate 300 can be improved, the scattering of the light can be reduced, the utilization rate of the light can be improved, and the overall light-out effect of the backlight module 10 can be improved.

[0064] In some embodiments, the backlight module 10 further comprises a plurality of adhesive members 400, and each of the ridges 120 is attached to the inner wall of the corresponding accommodating groove 320 by at least one of the adhesive members 400. Optionally, the adhesive member 400 is a double-sided adhesive tape, and the two adhesive surfaces of the adhesive member 400 are attached to the ridge 120 and the inner wall of the accommodating groove 320, respectively. Preferably, the adhesive member 400 is transparent. The attachment of the ridge 120 to the inner wall of the accommodating groove 320 by the adhesive member 400 can avoid excessive blocking of the light, thereby maintaining the OD (Optical Density) of the backlight module 10.

[0065] In a preferred embodiment, the ridge 120 comprises a top wall 121 away from the light-reflecting groove 110, and the adhesive member 400 is attached to the top wall 121. It can be understood that the light-reflecting groove 110 is used to reflect the light emitted by the light source 210 to improve the divergence of the outgoing light and make the overall light-out uniform. If the adhesive member 400 is attached to the light-reflecting groove 110, the reflection effect of the light-reflecting groove 110 will be affected, and the light-out uniformity will be weakened. If the adhesive member 400 is attached to the top wall 121, the reflection effect of the light-reflecting groove 110 will not be affected, thereby maintaining the OD of the backlight module 10.

[0066] In order to ensure the bonding strength of the ridge 120 and the inner wall of the accommodating groove 320, the surface of the ridge 120 and / or the accommodating groove 320 suitable for being bonded with the bonding member 400 can be provided as a rough surface. It should be noted that the bonding member 400 is in interference fit with the ridge 120 and the accommodating groove 320, so as to be fully bonded with the surface of the ridge 120 and the accommodating groove 320. When the bonding surface of the ridge 120 and / or the accommodating groove 320 is a rough surface, compared with a smooth surface, the bonding area with the bonding member 400 can be increased, and thus the bonding strength is improved. Preferably, the surface of the ridge 120 and the accommodating groove 320 suitable for being bonded with the bonding member 400 is provided as a rough surface. In this way, the bonding strength of the ridge 120 and / or the accommodating groove 320 and the bonding member 400 is improved, and thus the structural strength of the assembly of the diffusion plate 300 and the reflective structure 100 is improved, and the quality of the backlight module 10 is improved.

[0067] The backlight module 10 provided by the embodiments of the present application can make the light generated by the light source converge in the region, avoid obvious diffusion of the light halo, reduce the influence of the light between the regions, and thus improve the utilization rate of the light, which is helpful to improve the distribution of the light on the diffusion plate, so that the light is uniformly dispersed to the entire backlight region, the appearance of dark and bright regions can be reduced, and the uniformity and overall brightness of the backlight are improved. In addition, the accommodating groove 320 is formed on the diffusion plate 300, and the ridge 120 formed by folding the reflective structure 100 is inserted into the accommodating groove 320, so that the reflective structure 100 is embedded with the diffusion plate 300. Compared with the existing backlight structure in which the planar diffusion plate is directly stacked above the reflective structure 100, the backlight module 10 provided by the embodiments of the present application can further reduce the overall thickness under the premise of ensuring the light emission effect, and the structure is compact, which conforms to the development trend of thin and light electronic products.

[0068] The embodiments of the present application also provide a display device, which comprises the backlight module 10 in any of the above embodiments or the reflective structure 100 in any of the above embodiments. Since the backlight module adopts part or all of the technical solutions of the above embodiments, the display device at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described herein.

[0069] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0070] The above describes the reflective structure, the backlight module and the display device provided by the embodiments of the present application in detail. The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the technical solutions of the present application and the core ideas thereof. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently, and the modification or replacement does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A reflective structure applied to a backlight module, the backlight module comprising a light source module, the light source module comprising a plurality of light sources, characterized in that, The reflective structure is integrally formed from a reflective material and includes a plurality of light-reflecting grooves arranged in an array, each of the light-reflecting grooves being adapted to accommodate at least one of the light sources.

2. The reflective structure of claim 1, wherein, The reflective material is reflective paper.

3. The reflective structure of claim 1, wherein, The light-reflecting grooves are conical grooves.

4. A backlight module, characterized in that, The backlight module comprises: a light source module comprising a plurality of light sources; The reflective structure of any one of claims 1-3, wherein a ridge is formed between each pair of adjacent light-reflecting grooves. The diffusion plate comprises an incident light surface and a plurality of accommodation grooves formed in the diffusion plate from the incident light surface towards the interior of the diffusion plate, each of the ridges being inserted into one of the accommodation grooves.

5. The backlight module of claim 4, wherein, The light source module further comprises a lamp plate and a plurality of driving devices arranged above the lamp plate, each of the driving devices driving a plurality of the light sources. The reflective structure is arranged above the lamp plate, and each of the ridges and the lamp plate enclose a cavity, each of the cavities accommodating a plurality of the driving devices.

6. The backlight module of claim 5, wherein, Each of the light-reflecting grooves comprises a bottom wall and a circumferential side wall enclosing the bottom wall, the bottom wall being provided with an aperture, the light source being inserted into the aperture and connected to the lamp plate.

7. The backlight module of any of claims 4-6, wherein, The diffusion plate further comprises an incident light surface and a plurality of light-blocking grooves formed in the diffusion plate from the incident light surface towards the interior of the diffusion plate, each of the light-blocking grooves being opposite to and spaced apart from one of the accommodation grooves.

8. The backlight module of claim 7, wherein, The depth of each of the light-blocking grooves and the depth of the corresponding one of the accommodation grooves are less than or equal to 60% of the thickness of the diffusion plate.

9. The backlight module of any of claims 4-6, wherein, The diffusion plate further comprises an incident light surface and a plurality of light-blocking grooves formed in the diffusion plate from the incident light surface towards the interior of the diffusion plate, each of the light-blocking grooves being opposite to and spaced apart from one of the accommodation grooves.

10. The backlight module of any one of claims 4-6, wherein, Each of the ridges and the inner wall of the corresponding one of the accommodation grooves has an assembly gap.

11. The backlight module of any of claims 4-6, wherein, The backlight module further comprises a plurality of adhesive members, each of the ridges being attached to the inner wall of the corresponding one of the accommodation grooves via a plurality of the adhesive members.

12. The backlight module of claim 11, wherein, The ridges comprise a top wall distanced from the light-reflecting grooves, and the adhesive members are attached to the top wall.

13. The backlight module of claim 11, wherein, The surface of the ridges and / or the accommodation grooves adapted to be attached to the adhesive members is a rough surface.

14. The backlight module of any one of claims 4-6, wherein, The depth of the accommodation grooves is less than or equal to 60% of the thickness of the diffusion plate.

15. The backlight module of any of claims 4-6, wherein, The accommodation grooves are conical grooves.

16. A display device comprising: The backlight module of any one of claims 4-13 or the reflective structure of any one of claims 1-3.

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