TWI782783B - Display device, backlight module, and method for assembling backlight module - Google Patents

Abstract

A backlight module includes a housing, a diffuser plate, an optical film, a holder and a light source. The housing has a groove. The groove is arranged along a periphery of the housing. The diffuser plate is disposed in the housing and has an edge located in the groove. The optical film is disposed on the diffuser plate and has a thru-hole. The holder is disposed in the groove of the housing and includes a holding portion and a hanging portion. The holding portion engages the edge of the diffuser plate. The hanging portion is connected to the holding portion and extends through the thru-hole of the optical film. The light source is disposed in the housing.

Description

Display device, backlight module and method for assembling the backlight module

The disclosure relates to a display device, a backlight module of the display device and an assembly method of the backlight module.

Display backlight modules contain optical films that homogenize the light from the light source. However, with regard to the way of fixing the optical film, the method adopted by the current backlight module will affect the appearance of the backplane of the backlight module (for example: the backplane needs to be slotted), and may also cause light leakage, so that the display needs to be installed. Additional exterior parts to enhance the look and prevent light leaks.

In view of this, one purpose of the present disclosure is to provide a backlight module capable of fixing the optical film without affecting the appearance.

To achieve the above object, according to some embodiments of the present disclosure, a backlight module includes a casing, a diffuser plate, an optical film, a fixing member, and a light source. The housing has grooves along the edges of the housing. The diffusion plate is arranged in the casing, and the edge of the diffusion plate is located in the groove of the casing. The optical film is arranged on the diffusion plate and has a through hole. The fixing part is arranged in the groove of the casing, and includes a holding part and a hanging part. The holding part is fixed on the edge of the diffusion plate, and the hanging part is connected with the holding part and extends through the through hole of the optical film. The light source is arranged in the casing.

In one or more embodiments of the present disclosure, the holding portion of the fixing member holds the diffuser plate.

In one or more embodiments of the present disclosure, the diffuser plate has opposite first and second surfaces. The holding part of the fixture includes a first covering part, a second covering part and a third covering part, the first covering part and the second covering part are in contact with the first surface and the second surface of the diffusion plate respectively, and the third covering part is connected to the second covering part. Between the first covering part and the second covering part.

In one or more embodiments of the present disclosure, an edge of the diffusion plate has at least one notch, and the holding portion is disposed in the notch.

In one or more embodiments of the present disclosure, the hanging part includes a hook, and the hook is located at an end of the hanging part away from the holding part.

In one or more embodiments of the present disclosure, the diffusion plate has a first surface, a second surface and a third surface, the third surface is opposite to the first surface, and the second surface is connected between the first surface and the third surface . The holding part of the fixture includes a connected first covering part and a second covering part, the first covering part and the second covering part respectively contact the first surface and the second surface of the diffuser plate, and the holding part and the third surface of the diffuser plate separate.

In one or more embodiments of the present disclosure, the hanging part of the fixing part is connected to the first covering part and extends through the diffuser plate.

In one or more embodiments of the present disclosure, the light source, the diffusion plate and the optical film are arranged in a first direction. The casing includes a platform portion and a side wall portion. The platform part is used for carrying the display panel. The side wall portion is connected to the platform portion, and in the first direction, the side wall portion extends beyond the platform portion.

According to some embodiments of the present disclosure, a display device includes the above-mentioned backlight module and a display panel disposed on the platform portion of the casing.

In one or more embodiments of the present disclosure, the light source, the diffusion plate and the optical film are arranged in a first direction. The casing further includes a side wall portion connected to the platform portion and extending along the outer edge of the display panel, and in the first direction, the side wall portion extends beyond the display surface of the display panel or is aligned with the display surface.

According to some embodiments of the present disclosure, a method for assembling a backlight module includes: fastening the fixing member on the edge of the diffuser plate; disposing the optical film on the diffuser plate and sleeved on the hanging portion of the fixing member, Combining the fixing piece, the diffusion plate and the optical film; and packing the combined fixing piece, the diffusion plate and the optical film into the casing, so that the edges of the fixing piece and the diffusion plate are located in the groove of the casing, wherein the groove A slot is provided along the edge of the housing.

In one or more embodiments of the present disclosure, the diffusion plate and the optical film are arranged in a first direction. The step of loading the combined fixing part, diffuser plate and optical film into the housing includes: sliding the combined fixing part, diffuser plate and optical film into the housing along a second direction substantially perpendicular to the first direction in the trench.

To sum up, in the backlight module of the present disclosure, the diffuser plate and the optical film are combined through the fixing member, and the housing of the backlight module is an integrally formed structure with grooves formed. The gap between the diffuser plate and the optical film The rim as well as the retainer are receivable in the groove. In this way, the backlight module of the present disclosure can achieve the fixation of the diffuser plate and the optical film while maintaining the integrity of the appearance, and does not need to be equipped with additional appearance parts to beautify the appearance and prevent light leakage.

In order to make the description of this disclosure more detailed and complete, reference may be made to the attached drawings and various implementations described below. Elements in the drawings are not drawn to scale and are provided merely to illustrate the present disclosure. Numerous practical details are described below in order to provide a thorough understanding of the present disclosure, however, those of ordinary skill in the relevant art will understand that the present disclosure can be practiced without one or more of the practical details, and thus, these details are not apply to define this disclosure.

Referring to FIG. 1 , the display device 100 includes a display panel 110 (such as a liquid crystal display panel) and a backlight module 120 . The display panel 110 has opposite first surface 111 and second surface 112 (see FIG. 2 ), wherein the first surface 111 is used for displaying images, that is, the first surface 111 is the display surface of the display panel 110 . The backlight module 120 includes a casing 130 , and the display panel 110 is disposed on the casing 130 of the backlight module 120 in such a way that the first surface 111 faces away from the backlight module 120 . The backlight module 120 is configured to provide illumination for the display panel 110 so that the display panel 110 can display images.

As shown in Figure 1, for the convenience of description, the first direction D1 is defined as the normal direction of the first surface 111 of the display panel 110, and the second direction D2 is the direction in which the short side of the display device 100 extends (for example: upward direction) , and the third direction D3 is the direction in which the long sides of the display device 100 extend (for example, the horizontal direction). In some embodiments, the first direction D1 , the second direction D2 and the third direction D3 are substantially perpendicular or orthogonal to each other.

Referring to FIG. 2 , the housing 130 has an opening 139 facing the display panel 110 . The backlight module 120 further includes a light source 141 disposed in the housing 130 , and the light source 141 is disposed facing the opening 139 and facing the first direction D1 . In this way, the light source 141 can illuminate toward the display panel 110 through the opening 139 of the casing 130 . In some embodiments, the light source 141 includes one or more LEDs. In some embodiments, the light source 141 includes an LED light bar or an LED light board.

As shown in FIG. 2 , in some embodiments, the backlight module 120 further includes a reflector 142 , the reflector 142 partially covers the inner surface of the casing 130 and is configured to direct the light incident on the inner surface of the casing 130 toward The display panel 110 is reflective. In some embodiments, the reflection plate 142 has one or more openings 143 , and the light source 141 is disposed in the openings 143 of the reflection plate 142 .

As shown in FIG. 2 , in some embodiments, the housing 130 includes a back plate portion 131 , a side wall portion 132 and a platform portion 133 . The back plate part 131 is used for carrying the light source 141 and the reflector 142 . Specifically, the light source 141 can be disposed on the bottom surface B of the backboard part 131 , and the reflection plate 142 can cover the bottom surface B and the side surfaces of the backboard part 131 . The platform portion 133 is opposite to the back plate portion 131 and located on at least one side of the opening 139 of the casing 130 . The platform part 133 is used to carry the display panel 110 . For example, the display panel 110 can be fixed on the side of the platform part 133 away from the back panel part 131 through the adhesive layer A. As shown in FIG. The side wall portion 132 connects the back plate portion 131 and the platform portion 133 , and the back plate portion 131 , the side wall portion 132 and the platform portion 133 jointly define a groove 138 disposed along an edge of the housing 130 .

In some embodiments, the housing 130 has a sidewall portion 132 and a platform portion 133 on both the sky side and the left and right sides, together with the back plate portion 131 to form a groove 138 on the sky side and the left and right sides of the housing 130 . In some embodiments, the housing 130 is a metal housing integrally formed.

As shown in FIG. 2 , the backlight module 120 further includes a diffusion plate 151 and at least one optical film 152 disposed in the casing 130 . The light source 141 , the diffusion plate 151 and the optical film 152 are arranged in the first direction D1 , and the diffusion plate 151 and the optical film 152 are located between the light source 141 and the display panel 110 . The optical film 152 is disposed on the diffuser plate 151 , and at least one edge of the diffuser plate 151 and the optical film 152 is located in the groove 138 of the casing 130 .

In some embodiments, the diffusion plate 151 and the optical film 152 can be fixed to each other through double-sided tape or other suitable adhesives (not shown). In some embodiments, the glue can be distributed between the diffuser plate 151 and the optical film 152 and adjacent to the edges of the diffuser plate 151 and the optical film 152 . In some implementations, the diffuser plate 151 is fixedly connected to the housing 130 (for example, the diffuser plate 151 can be glued and fixed on the housing 130 ).

Please also refer to Figure 3. As shown in FIG. 2 and FIG. 3 , the backlight module 120 further includes at least one fixing part 160 . The fixing part 160 is disposed in the casing 130 and is used for strengthening and fixing the diffusion plate 151 and the optical film 152 . In some embodiments, the fixing part 160 is a metal part, which can be formed by bending a sheet metal. In some embodiments, the fixing member 160 includes stainless steel or other suitable metal materials.

As shown in Figures 2 and 3, specifically, the fixing member 160 is disposed in the groove 138 of the housing 130 (that is, the fixing member 160 is located between the back plate portion 131 and the platform portion 133 of the housing 130 between), and includes a holding portion 161 and a hanging portion 162 connected to the holding portion 161 . The holding portion 161 is fixed on the edge of the diffusion plate 151 . The optical film 152 has a through hole H, and the hanging portion 162 extends through the through hole H of the optical film 152 .

With the above configuration, the backlight module 120 of the present disclosure can achieve the fixation of the diffusion plate 151 and the optical film 152 while maintaining the integrity of the appearance, and does not need to be equipped with additional appearance parts to beautify the appearance and prevent light leakage. The omission of appearance components not only simplifies the structure of the display device 100 , but also helps the display device 100 to achieve a narrow frame design.

In some embodiments, the fixing member 160 is arranged on the upper edge of the diffuser plate 151 and the optical film 152, wherein the upper edge refers to the uppermost edge when the display device 100 is in an upright state (that is, the state shown in FIG. 1 ). the upper edge. Normally, the display device 100 is placed upright, and at this time, the fixing member 160 can support the optical film 152 from above. In this way, even if the adhesive between the diffuser plate 151 and the optical film 152 fails (for example, due to environmental factors such as temperature), the fixing member 160 can maintain the position of the optical film 152 in a hanging manner, so that it Align with diffuser plate 151.

In some embodiments, the backlight module 120 includes a plurality of fixing parts 160 arranged separately from each other along the upper edges of the diffusion plate 151 and the optical film 152 (ie, arranged along the third direction D3 ). The number and arrangement interval of the fixing parts 160 may depend on the size of the display device 100 or the display panel 110 .

As shown in FIG. 2 and FIG. 3 , in some embodiments, the holding portion 161 of the fixing member 160 clamps the diffusion plate 151 . In some embodiments, the diffusion plate 151 has surfaces C1 , C2 , and C3 , wherein the surface C3 is opposite to the surface C1 , and the surface C2 is connected between the surface C1 and the surface C3 . The retaining portion 161 of the fixing member 160 includes covering portions 161A, 161B, and 161C, wherein the covering portion 161A is opposite to the covering portion 161C, and the covering portion 161B is connected between the covering portions 161A, 161C, and forms a joint with the covering portions 161A, 161C. notch. The covering parts 161A, 161C respectively contact the surfaces C1 , C3 of the diffuser plate 151 , thereby sandwiching the diffuser plate 151 . In some embodiments, the covering portion 161B of the holding portion 161 contacts the surface C2 of the diffuser plate 151 . In some embodiments, the hanging portion 162 is connected to the covering portion 161C and extends away from the covering portion 161A or the diffusion plate 151 .

As shown in FIG. 2 and FIG. 3 , in some embodiments, the edge of the diffusion plate 151 has a notch 153 , and the holding portion 161 of the fixing member 160 is disposed in the notch 153 . In this way, the fixing member 160 can be firmly fixed on the diffuser plate 151 . In some embodiments, the depth of the notch 153 is greater than or equal to the thickness of the fixing part 160 (for example: the thickness of the covering part 161B), so that after the fixing part 160 is combined with the diffusion plate 151, the integral structure will not appear at the edge protrusion.

As shown in FIG. 2 and FIG. 3 , in some embodiments, the hanging portion 162 of the fixing member 160 includes a hook 163 , and the hook 163 is located at an end of the hanging portion 162 away from the holding portion 161 . The provision of the hook 163 helps to prevent the optical film 152 from detaching from the hanging portion 162 . In some embodiments, the hanging part 162 includes a first section 162A and a second section 162B, the first section 162A is connected to the holding part 161, and the second section 162B is connected to the first section 162A and is inclined to the first section Segment 162A extends.

As shown in FIG. 2 , in some embodiments, the sidewall portion 132 extends beyond the platform portion 133 in the first direction D1 , so that the sidewall portion 132 can serve as a frame of the display device 100 . Since the casing 130 as a whole does not extend to the side of the display panel 110 adjacent to the first surface 111, the user can only see the flat side wall portion 132 located outside the display panel 110 when viewing the display device 100 from the front, so the display device 100 has The appearance of narrow bezels.

As shown in FIG. 2, in some embodiments, the platform portion 133 has a surface 134 away from the back plate portion 131, and the side wall portion 132 has an end 136 away from the back plate portion 131. In the first direction D1, the side wall portion 132 The distance between the end 136 of the back plate portion 131 and the bottom surface B of the back plate portion 131 is greater than the distance between the surface 134 of the platform portion 133 and the bottom surface B of the back plate portion 131 . In some embodiments, the side wall portion 132 includes a bent portion 135 connected to the platform portion 133 , and the bent portion 135 extends beyond the platform portion 133 in the first direction D1.

As shown in FIG. 2 , in some embodiments, in the first direction D1 , the sidewall portion 132 extends beyond the first surface 111 (ie, the display surface) of the display panel 110 , or is aligned with the first surface 111 . In some embodiments, in the first direction D1, the distance between the end 136 of the sidewall portion 132 and the bottom surface B of the backplane portion 131 is greater than or equal to the distance between the first surface 111 of the display panel 110 and the bottom surface B of the backplane portion 131 distance between.

The following describes the assembly method of the backlight module 120 with reference to FIGS. 4 to 6 . The assembling method of the backlight module 120 may include steps S1-S5.

As shown in FIG. 4 , firstly, in step S1 , fasten the fixing member 160 on the edge of the diffuser plate 151 . In some embodiments, step S1 includes: snapping the holding portion 161 of the fixing member 160 into the notch 153 of the diffuser plate 151 .

As shown in Figure 5, then, in step S3, the optical film 152 is arranged on the diffuser plate 151, and sleeved on the hanging part 162 of the fixing member 160, so that the fixing member 160, the diffuser plate 151 and the optical film The diaphragm 152 is bonded. In some embodiments, step S3 includes: passing the hanging portion 162 of the fixing member 160 through the through hole H of the optical film 152 . In some embodiments, the method for assembling the backlight module 120 further includes: disposing glue between the diffuser plate 151 and the optical film 152 , so as to adhere and fix the diffuser plate 151 and the optical film 152 .

As shown in Fig. 6, at last, in step S5, the fixed piece 160, the diffuser plate 151 and the optical film 152 after being combined are packed into the housing 130, so that the edges of the fixed piece 160, the diffuser plate 151 and the optical film The edge of the sheet 152 is seated in the groove 138 of the housing 130 . In some embodiments, step S5 includes: sliding the combined fixing member 160 , the diffuser plate 151 and the optical film 152 into the groove 138 of the casing 130 along the second direction D2 substantially perpendicular to the first direction D1 middle. In some embodiments, the assembling method of the backlight module 120 further includes: fixing the diffusion plate 151 on the casing 130 .

Compared with the prior art, the method of assembling the backlight module 120 of the present disclosure uses the fixing member 160 to combine the diffuser plate 151 and the optical film 152, and then puts the three together into the housing 130, which is more time-saving and less expensive. It is not easy to cause scratches on the diffuser plate 151 and the optical film 152, so that the production efficiency and quality can be improved.

In some embodiments, after the assembly of the backlight module 120 is completed, the display panel 110 can be fixed on the platform portion 133 of the housing 130 to complete the assembly of the display device 100 .

Please refer to Figure 7 and Figure 8. In this embodiment, the covering part 261B of the holding part 261 of the fixing part 260 includes a first section 264A and a second section 264B, and the first section 264A and the second section 264B are respectively connected between the covering parts 161A and 161C. and separated from each other, so that a hollow area is formed between the first section 264A and the second section 264B. The edge of the diffusion plate 251 has two notches 253, the first section 264A and the second section 264B are respectively set in the two notches 253, and the relatively protruding part between the two notches 253 is inserted into the first section 264A and the second section The hollow area between 264B.

As shown in Figures 7 and 8, in addition, the hanging portion 262 of the fixing member 260 may not have a hook structure. In this embodiment, the hanging portion 262 includes a single straight section connected to the holding portion 261. The covering portion 161C, and the hanging portion 262 may extend perpendicularly to the covering portion 161C or obliquely to the covering portion 161C.

Please refer to Figure 9. In this embodiment, the fixing member 360 includes a substantially L-shaped holding portion 361 abutting against a corner of the diffuser plate 351 . Specifically, the holding portion 361 includes connected covering portions 361A, 361B, and the covering portions 361A, 361B are respectively used to contact adjacent surfaces C1 , C2 of the diffuser plate 351 and separated from the surface C3 of the diffuser plate 351 . The fixing member 360 of this embodiment has a simple structure, so it is easy to manufacture (for example, the bending process can be simplified).

As shown in FIG. 9, in some embodiments, the hanging portion 362 of the fixing member 360 is connected to the covering portion 361A, and the hanging portion 362 and the covering portion 361B are located on the same side of the covering portion 361A. Covering portion 361B extends in the same direction. In some embodiments, the covering portion 361A is located on the side of the diffuser plate 351 away from the optical film 152, and the hanging portion 362 extends through the diffuser plate 351 (for example: the hanging portion 362 can extend through the gap 353 on the edge of the diffuser plate 351 ), and pass through the through hole H of the optical film 152. With the above configuration, the fixing member 360 can be firmly fixed on the diffuser plate 351 .

As shown in FIG. 9, in some embodiments, the covering portion 361B includes a first section 364A and a second section 364B separated from each other. In the direction in which the first section 364A and the second section 364B are arranged, the hanging The hanging part 362 is located between the first section 364A and the second section 364B of the covering part 361B. With the above configuration, the fixing member 360 can be stably abutted against the diffuser plate 351 .

As shown in Figure 9, in some embodiments, the diffusion plate 351 also has two bosses 354, the two bosses 354 are located on both sides of the gap 353, the first section 364A and the second section 364B of the covering part 361B are respectively lean against the two bosses 354 .

To sum up, in the backlight module of the present disclosure, the diffuser plate and the optical film are combined through the fixing member, and the housing of the backlight module is an integrally formed structure with grooves formed. The gap between the diffuser plate and the optical film The rim as well as the retainer are receivable in the groove. In this way, the backlight module of the present disclosure can achieve the fixation of the diffuser plate and the optical film while maintaining the integrity of the appearance, and does not need to be equipped with additional appearance parts to beautify the appearance and prevent light leakage.

Although this disclosure has been disclosed above in the form of implementation, it is not intended to limit this disclosure. Anyone who is familiar with this technology can make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the protection of this disclosure The scope shall be defined by the appended patent application scope.

100: display device 110: display panel 111: first surface 112: second surface 120:Backlight module 130: Shell 131: back panel 132: side wall part 133: Platform Department 134: surface 135: bending part 136: end 138: Groove 139: opening 141: light source 142: reflector 143: opening 151,251,351: diffuser plate 152: Optical film 153,253,353: Gap 160, 260, 360: Fixing parts 161,261,361: holding part 161A, 161B, 161C, 261B, 361A, 361B: covering part 162,262,362: Hanging Department 162A, 264A, 364A: the first section 162B, 264B, 364B: the second section 163: hook 354:Boss A: Adhesive layer B: Bottom C1, C2, C3: surface D1: the first direction D2: Second direction D3: Third direction H: through hole

In order to make the above and other purposes, features, advantages and implementation methods of this disclosure more obvious and understandable, the accompanying drawings are described as follows: FIG. 1 is a perspective view illustrating a display device according to an embodiment of the present disclosure. Fig. 2 is a partially enlarged cross-sectional view showing the display device shown in Fig. 1 along line 1-1'. FIG. 3 is an exploded view showing some components of the display device shown in FIG. 2 . FIG. 4 to FIG. 6 are cross-sectional views illustrating various assembly stages of the backlight module of the display device shown in FIG. 2 . FIG. 7 is an exploded view showing a diffuser plate, an optical film and a fixing member according to another embodiment of the present disclosure. Fig. 8 is an assembly diagram showing the diffusion plate, the optical film and the fixing piece shown in Fig. 7 . FIG. 9 is an exploded view showing a diffuser plate, an optical film and a fixing member according to another embodiment of the present disclosure.

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

110: Display panel 151: Diffusion plate 111: first surface 152: optical film 112: Second surface 160: Fixing piece 120: Backlight module 161: Holding part 130: Housing 162: Hanging part 131: Back panel A: Adhesive layer 132: Side wall B: Bottom 133: Platform Department D1, D2, D3: Direction 134: surface H: through hole 135: bending part 136: end 138: Groove 139: opening 141: light source 142: reflector 143: opening

Claims (12)

A backlight module, comprising: a housing having a groove disposed along an edge of the housing; a diffuser plate disposed in the housing with an edge of the diffuser plate located in the groove of the housing; An optical film is arranged on the diffusion plate and has a through hole; A fixing part is arranged in the groove of the housing, and includes a holding part and a hanging part, the holding part is fixed on the edge of the diffuser plate, the hanging part is connected to the holding part, and extends passing through the through hole of the optical film; and A light source is arranged in the casing. The backlight module as claimed in claim 1, wherein the holding portion of the fixing member holds the diffuser plate. The backlight module according to claim 1, wherein the diffusion plate has a first surface and a second surface opposite to each other, and the holding part of the fixing member includes a first covering part, a second covering part and a first covering part Three covering parts, the first covering part and the second covering part are in contact with the first surface and the second surface of the diffusion plate respectively, the third covering part is connected between the first covering part and the second covering part between. The backlight module as claimed in claim 1, wherein the edge of the diffusion plate has at least one notch, and the holding portion is disposed in the notch. The backlight module according to claim 1, wherein the hanging portion includes a hook, and the hook is located at an end of the hanging portion away from the holding portion. The backlight module according to claim 1, wherein the diffuser plate has a first surface, a second surface and a third surface, the third surface is opposite to the first surface, and the second surface is connected to the second surface Between the first surface and the third surface, the holding part of the fixture includes a first covering part and a second covering part connected to each other, and the first covering part and the second covering part respectively contact the diffuser plate The first surface and the second surface, and the holding part is separated from the third surface of the diffusion plate. The backlight module as claimed in claim 6, wherein the hanging portion of the fixing member is connected to the first covering portion and extends through the diffuser plate. The backlight module as described in claim 1, wherein the light source, the diffuser plate and the optical film are arranged in a first direction, the casing includes a platform part and a side wall part, and the platform part is used to carry a In the display panel, the side wall portion is connected to the platform portion, and in the first direction, the side wall portion extends beyond the platform portion. A display device comprising: A backlight module as described in Claim 1; and A display panel is arranged on a platform part of the casing. The display device according to claim 9, wherein the light source, the diffuser plate and the optical film of the backlight module are arranged in a first direction, and the housing further includes a side wall portion connected to the platform portion and extends along the outer edge of the display panel, and in the first direction, the side wall portion extends beyond a display surface of the display panel or is aligned with the display surface. A method for assembling a backlight module, comprising: Fastening a fixing part to an edge of a diffusion plate; disposing an optical film on the diffuser plate, and sleeved on a hanging part of the fixing member, so that the fixing member, the diffuser plate and the optical film are combined; and Put the combined fixing piece, the diffuser plate and the optical film into a housing so that the edge of the fixing piece and the diffuser plate are located in a groove of the housing, wherein the groove is along the The edge of the case is set. The method for assembling a backlight module as described in Claim 11, wherein the diffuser plate and the optical film are arranged in a first direction, wherein the combined fixing member, the diffuser plate and the optical film are packed into The steps in this shell include: Sliding the combined fixing part, the diffusion plate and the optical film into the groove along a second direction, wherein the second direction is substantially perpendicular to the first direction.

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