Backlight module with reflector plate with folding modeling design and display device

Abstract

The utility model relates to a backlight module and a display device with reflector plates in folding modeling design, the backlight module is provided with a reflecting unit and a light source on the light incident side of a light guide plate, and the first reflector plate of the reflecting unit is provided with an attaching part located on the light incident side and an extending part extending from the attaching part along the light emergent surface. By means of the light reflection characteristic of the first reflection sheet, light rays which are not directly projected to the light inlet side of the light guide plate by the light source are reflected back to the light guide plate, light rays which are emitted to the edge area, adjacent to the light inlet side, of the light outlet face are reflected back to the light guide plate through the extension part, light leakage and hot spots are reduced, and the light energy utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a backlight module, especially applicable to the backlight module providing a back light for a display panel in a display device. BACKGROUND

[0002] At present, the display device is mostly liquid crystal type display device. Generally, the liquid crystal panel of the liquid crystal type display device is provided with a back light by a backlight module. In order to meet the demand of thinning of the display device, the backlight module is mostly in a side light type, that is, the light source is arranged on one side of the light guide plate, the light incident on the one side of the light guide plate is converted into a surface light source by total reflection of the light guide plate, or the surface light source is made uniform or bright by an optical film arranged on the light exit surface of the light guide plate, so as to provide a back light for the liquid crystal panel arranged on the light exit surface of the light guide plate.

[0003] However, in the backlight module of the display device, when the light source is arranged on the light incident side of the light guide plate, part of the light will leak out of the light exit surface of the light guide plate when the light source projects light on the light incident side of the light guide plate. In addition, the edge area adjacent to the light incident side of the light exit surface has a high temperature due to the high brightness of the light area close to the light source, which causes the edge area of the display panel adjacent to the light source of the backlight module to have an appearance defect caused by light leakage and hot spot. Therefore, in order to ensure the quality of the display device, it is necessary to further overcome the light leakage problem of the backlight module. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a backlight module with a reflective sheet having a folding design and a display device comprising the backlight module, so as to solve the technical problems of light leakage and hot spot in the existing backlight module.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a backlight module with a reflective sheet having a folding design, which comprises:

[0006] A light guide plate, the opposite two side surfaces of which are respectively a light exit surface and a back surface, the light exit surface and the back surface are respectively connected with a light incident side;

[0007] A reflective unit, which comprises a first reflective sheet, the first reflective sheet has an attached part and an extension part, the attached part is located on the light incident side, and the extension part extends from the attached part along the light exit surface; and

[0008] A light source arranged on the light incident side of the light guide plate.

[0009] In order to achieve the above-mentioned purpose, the utility model also provides a display device, which comprises:

[0010] A backlight module with a folding design as described above; and

[0011] A display panel disposed on the backlight module.

[0012] The utility model discloses a folding design of the backlight module with the whole composition structure of the display device, and the first reflector of the reflection unit has the attached part and the extension part, the attached part is disposed on the light entrance side of the light guide plate configuration light source, and the extension part extends from the attached part along the light exit surface, thereby, the light reflection characteristic of the first reflector is utilized, the light not directly projected to the light entrance side of the light guide plate is reflected to the light guide plate, and the extension part is utilized to provide the light reflection and shielding effect on the edge area of the light exit surface of the light guide plate adjacent to the light entrance side, the light projected to the edge area is reflected back to the light guide plate, light leakage and hot spot are effectively reduced, and light energy utilization is improved.

[0013] The utility model discloses a backlight module, and the reflection unit further includes a second reflector, the second reflector is disposed on the back of the light guide plate, and the light reflected to the light guide plate is assisted to the light reflected to the back of the light guide plate.

[0014] The utility model discloses a backlight module further sets up an optical film group on the light exit surface of the light guide plate, and the optical film group has a plurality of optical films which are sequentially stacked, wherein: the reflection unit has a positioning step on the extension of the first reflecting sheet, and the optical films sequentially form a positioning gap corresponding to the width change of the positioning step, and the positioning step and the positioning gap correspond to each other and are fixed on the extension; or the reflection unit has two positioning convex parts on the extension of the first reflecting sheet along the two ends of the light entrance side direction, and the plurality of optical films correspond to the positions of the positioning convex parts and are respectively provided with a positioning hole, and the positioning convex parts are respectively positioned and arranged through the positioning hole; or the extension of the first reflecting sheet has a group of connecting holes along the two ends of the light entrance side direction, and the plurality of optical films correspond to the positions of the group of connecting holes and are respectively provided with an assembly hole, and the light guide plate corresponds to the positions of the group of connecting holes and forms a group of assembly convex parts, and the group of assembly convex parts are arranged through the group of connecting holes of the extension and the assembly hole of the optical film. In this way, the reflection unit has good supporting and fixing performance for the optical film group, and the assembly convenience and the positioning accuracy of the optical film group assembled on the light exit surface of the light guide plate are improved, the combination structure of each optical element in the backlight module is optimized, and the mass production is better. In this way, the positioning and assembly of the first reflecting sheet, the optical film and other components are convenient, the light uniformity of the whole backlight module is improved, the rework and cleaning time caused by the poor assembly positioning of the components and the residual of the burr and foreign matters are reduced, the product production yield is improved, the improvement cost caused by the poor fixing structure of the light guide plate is avoided, and other effects are achieved.

[0015] In the backlight module, the light source includes a circuit substrate and a plurality of light emitting elements arranged on the circuit substrate, the attaching part of the reflection unit is provided with a through hole corresponding to the position of each light emitting element, the attaching part is fixed on the circuit substrate, and the light emitting elements are arranged on the light entrance side through the through hole corresponding to the position. The attaching part of the reflection unit has the functions of providing light source support and fixed positioning, and each light emitting element can accurately emit light on the light entrance side of the light guide plate. Meanwhile, the attaching part with light reflection characteristics and the light entrance side of the light guide plate are arranged on the side of each light emitting element, and the light source is scattered to the light entrance side. The light is effectively reflected to the light guide plate through the attaching part and the extension of the first reflecting sheet or the second reflecting sheet, the light leakage is reduced, and the light energy utilization rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional exploded schematic view of the first embodiment of the backlight module of the utility model.

[0017] Figure 2 It is Figure 1 It is the partial cross-sectional schematic view of the backlight module first embodiment combination.

[0018] Figure 3 is Figure 1 and Figure 2 The first embodiment of the backlight module shown in the use state reference diagram when the light source emits light.

[0019] Figure 4 is the exploded view of the second embodiment of the backlight module of the utility model.

[0020] Figure 5 is Figure 4 The second embodiment of the backlight module shown in the combined partial cross-sectional view.

[0021] Figure 6 is Figure 4 and Figure 7 The second embodiment of the backlight module shown in the use state reference diagram when the light source emits light.

[0022] Figure 7 is Figure 1 The partial enlarged exploded view of the reflection unit and the optical film set in the first embodiment of the backlight module.

[0023] Figure 8 is Figure 1 The partial cross-sectional view of the combined first embodiment of the backlight module.

[0024] Figure 9 is Figure 4 The partial enlarged exploded view of the second embodiment of the backlight module.

[0025] Figure 10 is the partial enlarged exploded view of another embodiment of the display device of the utility model.

[0026] Figure 11 is the partial cross-sectional view of an embodiment of the display device of the utility model.

[0027] Figure 12 is the partial cross-sectional view of another embodiment of the display device of the utility model including the frame. DETAILED DESCRIPTION

[0028] According to the content of the utility model disclosed above, the utility model relates to a backlight module and a display device comprising the backlight module, and the specific structure of the backlight module and the display device will be described below with reference to the drawings.

[0029] As Figure 1 shown, it discloses the first embodiment of the backlight module 1 of the utility model, which mainly comprises a light guide plate 10, a reflection unit 20 and a light source 30.

[0030] As shown in Figure 1 and Figure 2 , the light guide plate 10 has a plate body with total light reflection characteristics, and opposite sides of the light guide plate 10 are a light exit surface 11 and a back surface 12, respectively. One side end of the light guide plate 10 has a light entrance side 13, and the light entrance side 13 connects the light exit surface 11 and the back surface 12. The light exit surface 11 defines a main light exit area 111 and a peripheral area 112 located around the main light exit area 111, and the ranges of the main light exit area 111 and the peripheral area 112 are determined according to the area of a display screen of a display device.

[0031] As shown in Figure 1 and Figure 2 , the reflection unit 20 includes a first reflection sheet 21, which is an optical component with light reflection performance and has an attachment portion 211 and an extension portion 212. The attachment portion 211 is located at the light entrance side 13 of the light guide plate 10, and the extension portion 212 extends from the attachment portion 211 along the light exit surface 11 of the light guide plate 10. Basically, the extension portion 212 is arranged on the peripheral area 112 of the light exit surface 11 adjacent to the light entrance side 13, and the main light exit area 111 of the light exit surface 11 is not affected.

[0032] As shown in Figure 1 and Figure 2 , the light source 30 is arranged at the light entrance side 13 of the light guide plate 10 and can project light toward the light entrance side 13. The incident light can be uniformly emitted from the light exit surface 11 of the light guide plate 10 by the total light reflection of the back surface 12 of the light guide plate 10.

[0033] As shown in Figure 3 , in the foregoing, the light source 30 projects light toward the light entrance side 13 of the light guide plate 10, and the first reflection sheet 21 of the reflection unit 20 can be located outside the space between the light source 30 and the light entrance side 13 of the light guide plate 10 to provide light reflection performance. The light rays L1 scattered by the light source 30 outside the light entrance side 13 are reflected to the light guide plate 10 through the extension portion 212, and the light rays L2 projected to the peripheral area 112 of the light exit surface 11 of the light guide plate 10 adjacent to the light entrance side 13 are reflected back to the light guide plate 10 by the extension portion 212 to provide light reflection and shielding effects. The light rays L2 projected to the peripheral area 112 are reflected back to the light guide plate 10, reducing light leakage and hot spots and improving light energy utilization.

[0034] As shown in Figure 2 , in the embodiment, the light source 30 is a light bar, which includes a circuit substrate 31 and a plurality of light-emitting elements 32 arranged on the circuit substrate 31. Preferably, the light-emitting elements 32 are light-emitting diodes (LEDs) to have low power consumption and long service life.

[0035] As shown in Figure 2 order to combine the light source 30 located at the light-in side 13 of the light guide plate 10 with the attaching portion 211 of the first reflective sheet 21, the attaching portion 211 is provided with a through hole 2111 corresponding to the position of each light emitting element 32, and the attaching portion 211 is fixed to the side of the circuit substrate 31 facing the light-in side 13 of the light guide plate 10. The attaching portion 211 and the circuit substrate 31 can be fixed by an adhesive 23. Each light emitting element 32 projects light through the corresponding through hole 2111 to the light-in side 13, so that each light emitting element 32 can accurately project light at the predetermined position on the light-in side 13 of the light guide plate 10. As shown in Figure 3 the attaching portion 211 with light reflection properties is arranged opposite to the light-in side 13 and located at the side of each light emitting element 32, so that the light scattered by the light source 30 to the outside of the light-in side 13 is reflected by the attaching portion 211 and the extending portion 212 to the light guide plate 10, thereby reducing light leakage and effectively improving light energy utilization.

[0036] As shown in Figure 1 and Figure 2 the backlight module 1 further includes an optical film set 40 arranged on the light-out side 11 of the light guide plate 10 and having a plurality of optical films 41 stacked in sequence. The optical films 41 have specific optical properties, for example, the optical films 41 can be diffusion films with light diffusion properties, brightness enhancement films with brightness enhancement properties, or prism films with light turning properties, etc. The number of optical films 41 and the selection of their optical properties are determined according to the use requirements of the backlight module 1. After the light emitted by the light source 30 is guided by the light guide plate 10 and exits from the light-out side 11, it is diffused and brightened by the optical film set 40, thereby improving the brightness and uniformity of the backlight module 1.

[0037] As shown in Figure 4 and Figure 5 In the second embodiment shown in

[0038] As shown in Figure 4 and Figure 5 In the foregoing, the first reflective sheet 21 and the second reflective sheet 22 can be integrally formed components, or the second reflective sheet 22 and the first reflective sheet 21 can be independent components.

[0039] As shown in Figure 4 and Figure 5 , preferably, the second reflective sheet 22 extends from the back surface 12 of the light guide plate 10 to the first reflective sheet 21 and is connected to the side edge of the extension portion 212 away from the attachment portion 211. Figure 6 As shown in , by configuring the second reflective sheet 22 and the extension portion 212 of the first reflective sheet 21 on opposite sides of the light source 30, and combining the configuration of the attachment portion 211 attached to the light source 30, the reflective unit 20 provides light reflection performance on three different sides of the space between the light source 30 and the light entry side 13 of the light guide plate 10, and more effectively reflects the light rays L1, L2, L3 scattered by the light source 30 outside to the light guide plate 10, so as to reduce light leakage and achieve better light energy utilization.

[0040] Figures 1 to 3 In order to easily assemble and position the optical film set 40 on the light exit surface 11 of the light guide plate 10, it can be assembled and positioned by the reflective unit 20, or the light guide plate 10 combined with the reflective unit 20 can be used to assemble and position the optical film set 40, and at least the following combination structures can be achieved, which can be implemented in combination with the first embodiment as shown in Figures 4 to 6 or the second embodiment as shown in , but are not limited thereto.

[0041] Figure 7 In one combination structure of the embodiment as shown in Figure 7 and Figure 8 , a positioning step 213 is provided on the extension portion 212 of the first reflective sheet 21, the positioning step 213 forms stepped protrusions 213a, 213b, the optical film 41 of the optical film set 40 sequentially forms positioning notches 42a, 42b corresponding to the width change of the positioning step 213, and the outermost optical film 41 can be provided with or without the positioning notches, the protrusions 213a, 213b of the positioning step 213 correspond to and are fixed on the extension portion 212 respectively, and the positioning notches 42a, 42b, and the adhesive element 2131 can be provided between the positioning step 213 and the outermost optical film 41, so that the optical film set 40 is positioned and assembled on the light exit surface 11 of the light guide plate 10 by the first reflective sheet 21, and the first reflective sheet 21 provides support and positioning performance for the optical film set 40.

[0042] For example, the step-like protrusions 213a, 213b of the positioning step 213 gradually decrease in width, i.e., the protrusion 213a at the base of the positioning step 213 is the widest, and the protrusion 213b at the next step is the second widest. In the optical film set 40, the positioning notches 42a, 42b of the optical films 41 gradually decrease in size according to their distance from the light guide plate 10, i.e., the positioning notch 42a of the optical film 41 closest to the light guide plate 10 corresponds to the widest protrusion 213a at the base of the positioning step 213, and the positioning notch 42b of the optical film 41 second closest to the light guide plate 10 corresponds to the second widest protrusion 213b at the next step of the positioning step 213, and so on. Each optical film 41 has its positioning notches 42a, 42b corresponding to the protrusions 213a, 213b of the positioning step 213, and the outermost optical film 41 is positioned by the outermost protrusion 213b. Thus, each optical film 41 in the optical film set 40 can be positioned separately, and the assembly process is simplified.

[0043] As shown in another combined structure of the embodiment, Figure 9 the two ends of the extension 212 of the first reflective sheet 21 each have two positioning protrusions 214 along the light-in side 13. The optical film set 40 has a plurality of optical films 41 each having a positioning hole 43 corresponding to the position of the positioning protrusions 214. The positioning protrusions 214 are respectively positioned through the positioning holes 43, so that the optical film set 40 is positioned and assembled on the light-out side 11 of the light guide plate 10 by the first reflective sheet 21. The first reflective sheet 21 provides support and positioning for the optical film set 40, and the assembly process of the optical film set 40 is simplified.

[0044] As shown in the above embodiment, Figure 9 the positioning protrusions 214 can further have a positioning recess 215 on the side facing the light guide plate 10. The light guide plate 10 has a positioning protrusion 14 corresponding to the position of the positioning recess 215. The positioning recess 215 and the positioning protrusion 14 are combined to increase the stability and support performance of the combination of the optical film set 40, the first reflective sheet 21, and the light guide plate 10.

[0045] As shown in another combined structure of the embodiment, Figure 10In the illustrated embodiment, each end of the extension 212 of the first reflector 21 along the light-incident side 13 has a set of mounting holes 216. Each of the plurality of optical films 41 of the backlight module 1 has a mounting hole 44 corresponding to the mounting holes 216. The light guide plate 10 forms a mounting protrusion 15 corresponding to the mounting holes 216. The mounting protrusion 15 passes through the mounting holes 216 of the extension 212 and the mounting holes 44 of the optical films 41. This allows the optical film assembly 40, the first reflector 21, and the light guide plate 10 to be easily assembled together.

[0046] like Figure 11 As shown, this invention discloses an embodiment of the display device, which includes a backlight module 1 and a display panel 5. The specific composition and structure of the backlight module 1 have been described in the previous embodiments and will not be repeated here. The display panel 5 is disposed on the backlight module 1. In this embodiment, the backlight module 1 has an optical film group 40 on the light-emitting surface 11 of the light guide plate 10, and the display panel 5 is disposed on the optical film group 40. The display panel 5 is a liquid crystal panel. The display panel 5 uses the backlight module 1 to provide a light source 30, and uses the light reflection characteristics of the first reflective sheet 21 of the reflective unit 20 to reflect the light from the light source 30 that is not directly projected onto the light-incident side 13 of the light guide plate 10 into the light guide plate 10. At the same time, the extension 212 provides light reflection and shielding at the edge area 112 of the light-emitting surface 11 of the light guide plate 10 near the light-incident side 13, reflecting the light projected onto the edge area 112 back into the light guide plate 10, effectively reducing light leakage and hot spots.

[0047] like Figure 11 As shown, the display panel 5 includes a display area 51 and a black border area 52 surrounding the display area 51. In the light-emitting surface 11 of the light guide plate 10, the area of ​​the main light-emitting area 111 corresponds to the range of the display area 51 of the display panel 5, while the edge area 112 surrounding the main light-emitting area 111 corresponds to the range of the black border area 52 surrounding the display area 51. Therefore, this optimized backlight module 1 can provide a good backlight source for the display panel 5, enabling the display panel 5 to controllably display a clear and bright image. It also overcomes the problems of light leakage and hot spots at the light-emitting position in existing backlight modules 1, which lead to poor appearance of the display device.

[0048] like Figure 12As shown, another embodiment of the display device is disclosed, which further comprises an outer frame 6, and the backlight module 1 and the display panel 5 are arranged in the outer frame 6. Wherein, the outer frame 6 comprises a back plate 61 and a side wall 62 protruding from the side of the back plate 61, the back plate 61 can bear the second reflecting sheet 22 of the reflecting unit 20 and the light guide plate 10 thereon, the circuit substrate 31 of the light source 30 is attached to the side wall 62 by the adhesive 33, and the first reflecting sheet 21 is attached to the circuit substrate 31, so that the side wall 62 of the outer frame 6 provides support and fixing effect for the light source 30 and the first reflecting sheet 21 of the reflecting unit 20.

[0049] As described above, in the utility model, the attaching part 211 of the first reflecting sheet 21 of the reflecting unit 20 is directly attached to the light source 30, and the extension part 212 of the first reflecting sheet 21 extends above the light exit surface 11 of the light guide plate 10, so as to solve the hot spot phenomenon of the light source 30, not only the effect of convenient assembly can be achieved, but also the light uniformity of the light guide plate 10 can be improved.

[0050] In addition, in the utility model, the support and fixing mechanism of the first reflecting sheet, optical film and other components of the reflecting unit in the backlight module can be optimized in each embodiment. In an embodiment of the utility model, the positioning step is formed by the first reflecting sheet located on the light entrance side of the light guide plate, so that the optical film set is positioned on the light exit surface of the light guide plate by the first reflecting sheet, the risk of poor light emitting surface of the backlight module caused by the positioning structure of the light guide plate for fixing the optical film is avoided, and the mold cost of the light guide plate is reduced. In another embodiment of the utility model, the positioning and assembly of the first reflecting sheet, optical film and other components can be completed by the assembly protrusion on the same light guide plate, so as to improve the assembly convenience and shorten the working hours.

[0051] In summary, the overall composition structure of the reflecting unit arranged on the light entrance side of the light guide plate is more suitable for mass production, not only the positioning and assembly of the first reflecting sheet, optical film and other components are convenient, or the light uniformity of the overall backlight module is improved, but also the rework and cleaning time caused by the poor positioning and assembly of the multiple components or the residue of burrs and foreign matters is reduced, the product production yield is increased, the improvement cost caused by the poor fixing structure of the light guide plate is avoided, and other effects are achieved.

[0052]

Symbol Description

[0053] 1: Backlight module

[0054] 10: Light guide plate

[0055] 11: Light exit surface

[0056] 111: Main light exit area

[0057] 112: edge region

[0058] 12: back surface

[0059] 13: light incident side

[0060] 14: alignment protrusion

[0061] 15: assembly protrusion

[0062] 20: reflection unit

[0063] 21: first reflection sheet

[0064] 211: attachment portion

[0065] 2111: perforation

[0066] 212: extension portion

[0067] 213: positioning step

[0068] 213a, 213b: protrusion

[0069] 2131: adhesive element

[0070] 214: positioning protrusion

[0071] 215: alignment recess

[0072] 216: assembly hole

[0073] 22: second reflection sheet

[0074] 23: adhesive member

[0075] 30: light source

[0076] 31: circuit substrate

[0077] 32: light emitting element

[0078] 33: adhesive member

[0079] 40: optical sheet set

[0080] 41: optical sheet

[0081] 42a, 42b: positioning notch

[0082] 43: positioning hole

[0083] 44: assembly hole

[0084] 5: display panel

[0085] 51: display region

[0086] 52: black border region

[0087] L1, L2, L3: light rays

[0088] 6: outer frame

[0089] 61: back plate

[0090] 62: side wall

Claims

1. A backlight module with a reflective sheet having a folding design, characterized in that, The application relates to a backlight module with a folding design. The backlight module comprises a light guide plate, a reflection unit and a light source. The light guide plate has opposite sides, a light exit side and a back side. The reflection unit comprises a first reflection sheet having an attaching part and an extending part. The attaching part is located at the light exit side.

2. The backlight module with the folding design of claim 1, wherein, The extending part extends from the attaching part along the light exit side.

3. The backlight module with the folding design of claim 2, wherein, The light source is arranged at the light exit side of the light guide plate.

4. The backlight module with the folding design of claim 1, wherein, The reflection unit further comprises a second reflection sheet arranged at the back side of the light guide plate. The first reflection sheet is connected with the second reflection sheet.

5. The backlight module with the folding design of claim 1, wherein, The extending part of the first reflection sheet has a positioning step. The backlight module with the folding design further comprises an optical film set arranged at the light exit side of the light guide plate.

6. The backlight module with the folding design of claim 5, wherein, The optical film set has a plurality of optical films stacked in sequence.

7. The backlight module with the folding design of claim 1, wherein, The optical films sequentially form positioning gaps corresponding to the width change of the positioning step. The positioning step and the positioning gaps correspond to each other and are fixed on the extending part. The extending part of the first reflection sheet has two positioning protrusions at both ends along the light exit side.

8. The backlight module with the folding design of claim 1, wherein, The backlight module with the folding design further comprises an optical film set arranged at the light exit side of the light guide plate.

9. The backlight module with the folding design of claim 8, wherein, The optical film set has a plurality of optical films stacked in sequence.

10. A display device, characterized by comprising: The optical films correspond to the positions of the positioning protrusions and are respectively provided with positioning holes. The positioning protrusions are respectively positioned and penetrated through the positioning holes. The side of the positioning protrusions facing the light guide plate forms positioning recesses. The light guide plate corresponds to the positions of the positioning recesses and forms positioning protrusions. The extending part of the first reflection sheet has a group of connecting holes at both ends along the light exit side. The backlight module with the folding design further comprises an optical film set arranged at the light exit side of the light guide plate. The optical film set has a plurality of optical films stacked in sequence. The optical films correspond to the positions of the group of connecting holes and are respectively provided with assembly holes. The light guide plate corresponds to the positions of the group of connecting holes and forms assembly protrusions. The assembly protrusions are positioned and penetrated through the connecting holes of the extending part and the assembly holes of the optical films. The light source comprises a circuit substrate and a plurality of light emitting elements arranged on the circuit substrate. The attaching part corresponds to the positions of the light emitting elements and is respectively provided with penetrating holes. The attaching part is fixed on the circuit substrate. The light emitting elements respectively project light to the light exit side through the penetrating holes corresponding to the positions. The attaching part and the circuit substrate are provided with a sticking member. The application relates to a backlight module with a folding design. The backlight module comprises a reflection sheet according to any one of claims 1 to 9. The backlight module further comprises a display panel arranged on the backlight module.

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