TW201816487A - Backlight module and display device using the same - Google Patents

Abstract

A backlight module includes a back board, an illumination assembly, a supporting component, and an optical film. The back board includes a bottom plate, a side wall, and a first confining structure. The side wall is connected to an edge of the bottom plate, and the first confining structure is disposed on the side wall. The illumination assembly is disposed on the back board. The supporting component includes a base, a second confining structure, and a protrusion. The second confining structure and the protrusion are connected to opposite sides of the base respectively. The base is supported by the bottom plate of the back board. The second confining structure is engaged with the first confining structure in a direction toward the base, and the protrusion extends upward from the base. The optical film is disposed on the illumination assembly and has at least one positioning opening the protrusion penetrates through.

Description

 Backlight module and display device thereof  

The present invention relates to a backlight module and a display device therefor.

Liquid crystal displays (LCDs) are widely used in various electronic products. Since the liquid crystal display panel itself cannot emit light, the liquid crystal display device is provided with a backlight module to provide a light source to display an image to the liquid crystal display panel. The backlight module includes an optical film to homogenize the light distribution from the light guide plate.

At present, in order to fix the optical film, a positioning column is often designed in the backlight module, and the optical film is often designed with a lug structure, and the optical film is fixed through the opening of the positioning column through the opening of the lug structure. In US Patent Application Publication No. 20160004007, the design support has a positioning post that passes through the optical film from top to bottom, such that the optical film is fixed between the support and the back plate, and on the other hand, the side wall of the back plate There is an outwardly directed projection to pass through the opening of the support to thereby limit the up and down movement of the support. However, such a support member is easily separated from the back plate during the assembly process, and has a problem that the installation steps are complicated.

In various embodiments of the present invention, the problems mentioned in the foregoing prior art can be solved by designing the structural relationship between the support member, the optical film and the back sheet.

According to some embodiments of the present invention, a backlight module includes a back plate, a light emitting assembly, a support member, and an optical film. The backboard comprises a bottom plate, a side wall and a first limiting structure, wherein the side wall is connected to the side of the bottom plate, and the first limiting structure is disposed on the side wall. The light emitting component is disposed on the backboard. The support member includes a base, a second limiting structure, and a protrusion. The second limiting structure and the protrusions are respectively connected to opposite sides of the base. The base is supported on the bottom plate of the back plate, and the second limiting structure is fitted to the first limiting structure in a direction toward the bottom plate, and the protrusion extends upward from the base. The optical film is disposed on the light emitting component, wherein the optical film comprises at least one positioning opening, and the protrusion passes through the positioning opening.

In some embodiments of the present invention, the second limiting structure has a side panel, and the side panel is connected to the side panel of the base, wherein the side panel and the base together define an opening, and the first limiting structure comprises an extension wall, and the extension wall passes through the opening.

In some embodiments of the invention, the extension wall is parallel to the side wall.

In some embodiments of the invention, the side panels contact the extension wall.

In some embodiments of the present invention, the side walls and the extension walls of the first limiting structure are respectively located on opposite sides of the side plates.

In some embodiments of the invention, the extension wall is not located on a plane in which the side wall is located, and the side panel includes a recessed portion into which at least a portion of the extension wall extending through the opening is fitted.

In some embodiments of the invention, the second limiting structure extends along a normal direction of the upper surface of the base.

In some embodiments of the present invention, the backlight module further includes a plastic frame, wherein the support member is disposed between the plastic frame and the back plate.

In some embodiments of the invention, the bezel includes a recess to receive the protrusion of the support.

In some embodiments of the present invention, the backboard includes a positioning protrusion, the positioning protrusion is connected to the bottom plate, and the optical film includes at least one second positioning opening through which the positioning protrusion passes.

In some embodiments of the present invention, the backlight module further includes a rear case, and the projection of the rear case on the optical film covers the second positioning opening and does not cover the first positioning opening.

According to some embodiments of the present invention, the present invention provides a display device including the foregoing backlight module, a rear case, and a display panel. The backlight module is disposed between the display panel and the rear case, and the rear case covers only a part of the backlight module.

100‧‧‧Backlight module

162‧‧‧First positioning opening

110‧‧‧ Backboard

112‧‧‧floor

112a‧‧‧ side

112b‧‧‧ openings

112c‧‧‧ first flat

112d‧‧‧Bevel

112e‧‧‧Second plane

114‧‧‧Side wall

116‧‧‧First limit structure

116a‧‧‧Extension wall

118‧‧‧ Positioning protrusion

120‧‧‧Front frame

130‧‧‧back shell

140‧‧‧Lighting components

145‧‧‧Diffuser

150‧‧‧Support

152‧‧‧Base

154‧‧‧second limit structure

154a‧‧‧ side panel

156‧‧‧ Protrusion

160‧‧‧Optical film

164‧‧‧Second positioning opening

170‧‧‧ plastic frame

172‧‧‧ Side wall

174‧‧‧Loading Department

176‧‧‧Resistance Department

178‧‧‧ Groove

180‧‧‧reflector

182‧‧‧ openings

200‧‧‧ display panel

DD‧‧‧ display device

O1‧‧‧ openings

R1‧‧‧ recessed part

S1‧‧‧ space

S2‧‧‧ space

A1‧‧‧ first area

A2‧‧‧Second area

D1‧‧‧ distance

T1‧‧‧ thickness

Line 2A-2A‧‧

Line 3A-3A‧‧

X, Y, Z‧‧ Direction

1 is a perspective view of a display device according to an embodiment of the present invention.

Fig. 2A is a schematic cross-sectional view taken along line 2A-2A of Fig. 1.

2B is a partial perspective view of the backlight module of FIG. 2A.

2C is a partial exploded view of the backlight module of FIG. 2A.

Fig. 3A is a schematic cross-sectional view taken along line 3A-3A of Fig. 1.

FIG. 3B is a partial perspective view of the backlight module of FIG. 3A.

The various embodiments of the present invention are disclosed in the drawings, and in the claims However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified manner.

1 is a perspective view of a display device DD according to an embodiment of the present invention. The display device DD includes a backlight module 100 and a display panel 200, an outer frame 120, and a rear case 130. The outer frame 120 has a display window 122. The display panel 200 is interposed between the back plate 110 and the outer frame 120 of the backlight module 100 and exposed through the display window 122. The display device DD has a first area A1 and a second area A2, wherein the rear case 130 is disposed in the second area A2 and is not disposed in the first area A1.

Hereinafter, the detailed structure of the backlight module 100 will be described with reference to FIGS. 1 , 2A, 2B, and 2C. 2A is a schematic cross-sectional view taken along line 2A-2A of FIG. 1. In other words, FIG. 2A is a schematic cross-sectional view of the first region A1 of the display device DD near the outer frame 120. FIG. 2B is a partial perspective view of the backlight module 100 of FIG. 2A. 2C is a partial exploded view of the backlight module 100 of FIG. 2A.

Referring to FIGS. 2A and 2B , the back plate 110 includes a bottom plate 112 , a side wall 114 , and at least one first limiting structure 116 . The side wall 114 is connected to the side 112 a of the bottom plate 112 (labeled in FIG. 2B ). The first limiting structure 116 is disposed on the sidewall 114. Specifically, the backlight module 100 further includes a light emitting assembly 140, a support member 150, a diffusion plate 145, and an optical film 160. The light emitting component 140 is disposed on the bottom plate 112 of the back plate 110.

Please refer to Figures 2C and 2B. In the present embodiment, the support member 150 includes a base 152, a second limiting structure 154, and a protrusion 156. The base 152 is supported by the bottom plate 112 of the back plate 110. The second limiting structure 154 cooperates with the first limiting structure 116, and the protrusion 156 protrudes from the upper surface of the base 152. The diffusion plate 145 and the optical film 160 are disposed on the light emitting assembly 140, wherein the optical film 160 includes at least one first positioning opening 162, and the protrusion 156 passes through the first positioning opening 162.

Through the above arrangement, the support member 150 can be fixed to the back plate 110 through the cooperation of the second limiting structure 154 and the first limiting structure 116, and the optical film 160 is inserted into the protrusion of the supporting member 150 through the first positioning opening 162 thereof. The 156 is disposed on the backboard 110.

Herein, the relationship between the first limiting structure 116 and the second limiting structure 154 is specifically described. As can be seen in FIG. 2C, in some embodiments of the present invention, the base 152 of the support member 150 is parallel to the bottom plate 112 of the back plate 110 such that the bottom plate 112 of the back plate 110 can planarly contact the base 152 of the support member 150. To achieve good support. Specifically, as shown in FIG. 2A, the bottom plate 112 includes a first planar portion 112c adjacent to the side wall 114, a second planar portion 112e away from the side wall, and a first planar portion 112c and a second planar portion 112e. The inclined surface portion 112d, and the base 152 of the support member 150 is parallel to the first flat portion 112c of the bottom plate 112 of the backing plate 110.

In addition, as shown in FIG. 2C and FIG. 2B, the second limiting structure 154 has a side plate 154a, wherein the side plate 154a is connected to the base 152 and has an opening O1 therein, and the first limiting structure 116 includes an extending wall 116a, the first limit The extension wall 116a of the bit structure 116 passes through the opening O1 such that the support member 150 is sleeved on the extension wall 116a. The portion of the extension wall 116a abuts against the inner surface of the side panel 154a (i.e., the surface of the side panel 154a that is further from the side wall 114). Thus, the back panel 110 can limit or constrain the movement of the support member 150 in the X direction of the drawing.

In some embodiments of the present invention, the extension wall 116a is spaced apart from the side wall 114 by a difference such that the side panel 154a of the support member 150 can be placed between the side wall 114 and the extension wall 116a by the step, such that the side wall 114 and the extension The walls 116a are respectively located on opposite sides of the side plates 154a (i.e., on the outer and inner surfaces of the side plates 154a, respectively) to fix the position of the support member 150 in the X direction.

On the other hand, the opening O1 of the support member 150 and the extension wall 116a of the back plate 110 can cooperate with each other, that is, the second limiting structure 154 is fitted to the first limiting structure 116 in the direction of the bottom plate 112, thereby limiting the support member 150. Position in the Y direction. For example, in some embodiments, in the Y direction, the width of the extension wall 116a may be less than or equal to the width of the opening O1, so that the extension wall 116a can pass through the opening O1, and allows the support 150 to be small in the Y direction. The movement of the amplitude, that is, the extension wall 116a and the support member 150 may be a clearance fit in the Y direction. In some embodiments, the width of the extension wall 116a in the Y direction is greater than the width of the opening O1, so that the support member 150 can be engaged with the inner wall of the opening O1, that is, the extension wall 116a and the support member 150 are in the Y direction. It can be an interference fit.

In some embodiments of the present invention, the side plate 154a includes a recessed portion R1 for engaging the recessed portion R1 through the extended wall 116a of the opening O1. Here, the extension wall 116a and the recessed portion R1 cooperate with each other to fix the position of the support member 150 in the Y direction. For example, the width of the extension wall 116a is not less than the width of the recessed portion R1, so that the support 150 can be in a stationary state with respect to the backing plate 110. Of course, the scope of the present invention should not be limited thereto. In some embodiments, the width of the extension wall 116a may be smaller than the width of the recess portion R1, so that the support member 150 can be in a movable state with respect to the back panel 110.

Ideally, the extending wall 116a of the first limiting structure 116 extends in the same direction as the side plate 154a of the second limiting structure 154, so that the extending wall 116a can be in planar contact with the side plate 154a of the second limiting structure 154. Specifically, the extension wall 116a of the first limiting structure 116 is in planar contact with the side plate 154a of the second limiting structure 154.

In some embodiments of the present invention, the side wall 114 is perpendicular to the bottom plate 112, and the extension wall 116a of the first limiting structure 116 is parallel to a plane where the side wall 114 is located (ie, a plane formed by the direction Y and the direction Z). The second limiting structure 154 extends along the normal direction of the upper surface of the base 152 (i.e., direction Z), thus saving the required space of the limiting structure. Certainly, the scope of the present invention should not be limited thereto. In other embodiments, the extending direction of the extension wall 116a of the first limiting structure 116 may be different from the extending direction of the side wall 114, but still with the second limiting structure 154. The extending direction is the same, and the extending direction of the second limiting structure 154 may be different from the normal direction of the upper surface of the base 152 (ie, the direction Z).

Referring to FIG. 2A , in some embodiments of the present invention, the first limiting structure 116 is not directly connected to the bottom plate 112 , but is connected to the bottom plate 112 through the side wall 114 . Herein, the distance between the projection of the outer surface of the first limiting structure 116 on the bottom plate 112 and the projection of the outer surface of the side wall 114 on the bottom plate 112 (ie, the side 112a of the bottom plate 112 in FIG. 2B) is greater than the support member. 150 thickness T1. As such, the support member 150 can be located between the side wall 114 of the backing plate 110 and the diffuser plate 145 in the X direction. When the user views the backlight module 100 from the rear, that is, when the backlight module 100 is viewed in the Z direction, the second limiting structure 154 is not perceived.

In some embodiments of the present invention, the back plate 110 is a plate body, which is formed by punching, recessing, cutting, etc. to form the bottom plate 112, the side wall 114, and the first limiting structure 116, so that the bottom plate 112 and the side wall 114 and the thickness of the first stop structure 116 are substantially the same. In some embodiments, the material of the backing plate 110 may be metal.

Similarly, in some embodiments of the present invention, the support member 150 is a plate body, which forms a base 152, a second limiting structure 154, and a protrusion 156 via stamping, recessing, cutting, etc., so that the base 152, The thickness of the second stop structure 154 and the protrusions 156 are substantially the same. In some embodiments, the material of the support member 150 may be metal or acrylic.

In some embodiments of the present invention, the second limiting structure 154 and the protrusion 156 are respectively connected to opposite sides of the base 152. There is a space S1 between the second limiting structure 154 and the protrusion 156 to accommodate the mounting ears of the optical film 160, so that the optical film 160 is not located outside the side wall 114 of the backing plate 110.

In some embodiments of the present invention, the backlight module 100 further includes a plastic frame 170, wherein the diffusion plate 145 and the optical film 160 are disposed between the plastic frame 170 and the back plate 110, and the support member 150 is disposed on the plastic frame 170 and Between the back plates 110.

Further, the plastic frame 170 includes a side wall portion 172 , a bearing portion 174 extending from the side wall portion 172 side, and a pressing portion 176 . The side wall portion 172 abuts against the extension wall 116a of the first limiting structure 116 of the backing plate 110. The carrier portion 174 is positioned above the protrusion 156, making it difficult for the optical film 160 to detach from the support member 150 in the Z direction. The carrying portion 174 can also be used to carry the display panel 200, and the diffusing plate 145 and the optical film 160 are partially located between the carrying portion 174 and the backing plate 110. The pressing portion 176 is connected to the carrying portion 174. The pressing portion 176 is configured to abut the optical film 160, and a cushioning material may be disposed between the pressing portion 176 and the optical film 160.

In some embodiments of the invention, the bezel 170 can include a recess 178 to receive the protrusion 156 of the support 150. The material of the plastic frame 170 is, for example, but not limited to, a high molecular polymer.

In some embodiments of the present invention, the outer frame 120 of the backlight module 100 is partially stacked on the plastic frame 170 to achieve the functions of fixing the support member 150, the diffusion plate 145 and the optical film 160 in the Z direction. The material of the outer frame 120 is, for example but not limited to, metal. The outer frame 120 is disposed at the periphery of the backlight module 100, and the edge portion of the display panel 200 is located between the plastic frame 170 of the backlight module 100 and a portion of the outer frame 120. In some embodiments of the present invention, the outer frame 120 can be fixed to the back plate 110 through an adhesive or other structural design, thereby achieving structural fixation of the display device DD as a whole.

So far, during the installation process, the support member 150 and the optical film 160 are all mounted on the back plate 110 in the same direction (here, the negative Z-axis direction). Specifically, the support member 150 may be fixed to the back plate 110 from top to bottom, and the optical film 160 may be fixed to the support member 150 from top to bottom. With the above arrangement, the problem that the support member 150 jumps during the installation process of the optical film 160 can be prevented, and since the support member 150 and the optical film 160 are installed only in one direction, it is helpful to solve the complicated installation steps. problem.

In various embodiments of the present invention, the backlight module 100 may further include a reflective plate 180 disposed between the back plate 110 and the diffusion plate 145. In some embodiments, the reflector 180 can be supported by the bottom plate 112. Specifically, the reflecting plate 180 may be supported by the first planar portion 112c and the second planar portion 112e of the bottom plate 112. In this embodiment, the light-emitting component 140 includes a light source and a lens, and the backlight module 100 is a direct-lit backlight module. In other embodiments, the backlight module can also be an edge-lit backlight module.

In various embodiments of the present invention, the display panel 200 is disposed on one side of the optical film 160 opposite to the back plate 110. The display panel 200 may include a polarizing plate, a liquid crystal layer, an active device array substrate, and the like, which are not drawn one by one.

Reference is also made to Figs. 1, 3A and 3B. Fig. 3A is a schematic cross-sectional view taken along line 3A-3A of Fig. 1. In other words, FIG. 3A is a schematic cross-sectional view of the second region A2 of the display device DD near the outer frame 120. FIG. 3B is a partial perspective view of the backlight module 100 of FIG. 3A. Here, in the second area A2, the back plate 110 includes a positioning protrusion 118, and the optical film 160 includes a second positioning opening 164, and the positioning protrusion 118 passes through the second positioning opening 164 of the optical film 160, so that the first limit is not set. In the case of the structure 116 and the support 150 (refer to FIG. 2A), the optical film 160 is fixed.

However, the bottom plate 112 forms a positioning protrusion 118 and an opening 112b corresponding to the positioning protrusion 118 therein by cutting and recessing. That is, the positioning protrusion 118 is disposed on the bottom plate 112. Because of the presence of the opening 112b of the bottom plate 112, external dust easily intrudes into the inside of the display device DD. Accordingly, in various embodiments of the present invention, the backlight module 100 further includes a rear case 130 connected to the back plate 110, and the rear case 130 covers a part of the back plate 110 (the back plate 110 in the second area A2). The dust is prevented from entering the backlight module 100 through the opening 112b. In addition, a space S2 is disposed between the back plate 110 and the rear case 130 to accommodate electronic components (not shown) that control the backlight module 100 and the display panel 200.

In the present embodiment, the reflecting plate 180 may have an opening 182 to pass the positioning protrusion 118 of the backing plate 110, and the reflecting plate 180 is only fixed to the positioning protrusion 118 of the backing plate 110 in the second area A2. In other embodiments, the reflecting plate 180 can be simultaneously fixed to the protrusion 156 of the support 150 in the first area A1 (refer to FIG. 2A) and the positioning protrusion 118 of the back board 110 in the second area A2. Alternatively, in still other embodiments, the reflecting plate 180 may be fixed only to the protrusion 156 of the support 150 in the first area A1 (refer to FIG. 2A).

In various embodiments of the present invention, the protrusion of the design support member passes through the optical film from bottom to top, and then the movement of the support member is restricted in each direction after the backlight module is assembled with the display panel. In addition, the design support member is located between the side wall of the backboard and the light-emitting component. When the user observes the backlight module from the rear, the support member is not observed, so there is no need to cover the back shell at the back of the back panel to achieve local thinning. Display purpose.

While the invention has been described above in terms of various embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application attached.

Claims (12)

 A backlight module includes: a back plate, a bottom plate, a side wall, and a first limiting structure, wherein the side wall is connected to one side of the bottom plate, and the first limiting structure is disposed on the side wall a light-emitting component disposed on the backplane; a support member including a base, a second limiting structure, and a protrusion, the second limiting structure and the protrusion respectively connected to opposite sides of the base, wherein the base Supporting the bottom plate of the back plate, the second limiting structure is fitted to the first limiting structure in a direction toward the bottom plate, the protrusion extending upward from the base; and an optical film, the setting In the illuminating assembly, the optical film includes at least one first positioning opening, the protrusion passing through the first positioning opening.    The backlight module of claim 1, wherein the second limiting structure of the supporting member has a side plate that connects the base of the supporting member, and the side plate defines an opening together with the base, the back plate The first limiting structure includes an extension wall that passes through the opening.    The backlight module of claim 2, wherein the extension wall is parallel to the side wall.    The backlight module of claim 2, wherein the side panel contacts the extension wall.    The backlight module of claim 2, wherein the side wall of the backboard and the extension wall of the first limiting structure are respectively located on opposite sides of the side panel.    The backlight module of claim 2, wherein the side panel comprises a recessed portion for at least a portion of the extension wall passing through the opening to be fitted to the recessed portion.    The backlight module of claim 1, wherein the second limiting structure of the supporting member extends along a normal direction of one of the upper surfaces of the base of the supporting member.    The backlight module of claim 1, further comprising: a plastic frame, wherein the support member is disposed between the plastic frame and the back plate.    The backlight module of claim 8, wherein the plastic frame comprises a recess to receive the protrusion of the support member.    The backlight module of claim 1, wherein the backplane comprises a positioning protrusion, the positioning protrusion is connected to the bottom plate, and the optical film comprises at least one second positioning opening, the positioning protrusion passes through the second positioning opening.    The backlight module of claim 10, further comprising: a rear case, wherein the projection of the rear case on the optical film covers the second positioning opening and does not cover the first positioning opening.    A display device, comprising: the backlight module of claim 1, a rear case; and a display panel, wherein the backlight module is disposed between the display panel and the rear case, and the rear case covers only a portion The backlight module.