TWI526740B - Thin type backlight module - Google Patents

Description

Thin backlight module

The present invention relates to a backlight module; in particular, the present invention relates to a thin backlight module.

In recent years, the technology of liquid crystal display devices has gradually matured. As consumer preferences and demands increase, liquid crystal display devices are becoming thinner. In order to achieve the purpose of thinning, various components of the liquid crystal display device are required to be reduced in thickness, such as a display panel, an optical film, and a backlight module. In the backlight module, since the required light mixing space is required, the required thickness is usually large, and thus it is also the main target for thickness reduction.

FIG. 1 shows a conventional direct type backlight module. As shown in FIG. 1, the backlight module 1a includes a light box 9a, and a light source 8 carried or housed in the light box 9a and a reflection sheet 3 having a hole. The reflection sheet 3 substantially divides the light box 9a into the lower layer space S1 and the upper layer space S2, wherein the lower layer space S1 has the light source 8 therein, and the light generated by the light source 8 is incident on the upper layer space S2 via the reflection sheet 3. Further, the light ray in the lower layer space S1 reflects the light to the upper space S2, and the light is mixed in the upper space S2.

When the backlight module 1a shown in Fig. 1 is thinned, it is reasonable to reduce the volume of the light box 9a, in particular, to reduce its height, so that the height of the lower space S1 and/or the upper space S2 is reduced. At this time, usually the reflection sheet 3 will thus be closer to the light source 8. As a result, the deformation or displacement of the reflection sheet 3 by the heat of the light source 8 is more likely to occur, which in turn affects the optical taste.

In summary, the conventional backlight module is difficult to have both a thin design and an optical taste. If not, the design of the present invention depends on the design of the present invention.

It is an object of the present invention to provide a backlight module that achieves a thin design.

Another object of the present invention is to provide a backlight module that solves the problem of thermal deformation of an optical control film.

Another object of the present invention is to provide a backlight module that provides better optical taste.

The backlight module of the present invention comprises a light source module, a first diffusion plate, an optical control film and a second diffusion plate. The light source module includes a carrier, a plurality of light sources, and at least one support structure. The carrier board has a bearing surface, and the light sources are respectively disposed on the bearing surface. The support structure is protruding from the bearing surface and located between adjacent two light sources. The first diffusion plate is disposed above the light sources and supported by the support structure. The optical control film is stacked on the side of the first diffusion plate opposite to the light source module, and the second diffusion plate is stacked on the side of the optical diffusion film opposite to the first diffusion plate. The optical control film comprises a reflective surface and a plurality of light-emitting structures; wherein the reflective surface is formed on one side of the optical control film facing the light source module, and the plurality of light-emitting structures respectively penetrate the optical control film. In the portion of the optical control film that is not overlapped with the projection of the support structure, the unit penetration area ratio of the light-emitting structures is changed according to a function value of the first function centering on the closest projection position of the light source; overlapping with the projection of the support structure In the optical control film portion, the unit penetration area ratio of the light-emitting structures is multiplied by a weight value change according to a function value of the first function centered on the closest light source projection position, and the weight value is between 1.05 and 1.30. between.

The backlight module of the invention comprises a light source module, a first diffusion plate and an optical control film With a second diffuser. The light source module includes a carrier plate and a plurality of light sources. The carrier board has a bearing surface and at least one side wall, wherein the side wall is protruded from the bearing surface, and the partitioning bearing surface is a plurality of blocks; the light sources are respectively disposed on the blocks. The first diffusion plate is disposed above the light sources and supported by the side walls. The optical control film is stacked on the side of the first diffusion plate opposite to the light source module, and the second diffusion plate is stacked on the side of the optical control film opposite to the first diffusion plate. The optical control film comprises a reflective surface and a plurality of light-emitting structures; wherein the reflective surface is formed on one side of the optical control film facing the light source module, and the plurality of light-emitting structures respectively penetrate the optical control film. In the portion of the optical control film that is not overlapped with the projection of the support structure, the unit penetration area ratio of the light-emitting structures is changed according to a function value of the first function centering on the closest projection position of the light source; overlapping with the projection of the support structure In the optical control film portion, the unit penetration area ratio of the light-emitting structures is multiplied by a weight value change according to a function value of the first function centered on the closest light source projection position, and the weight value is between 1.05 and 1.30. between.

〔this invention〕

10‧‧‧Backlight module

100‧‧‧Light source module

120‧‧‧ Carrier Board

1200‧‧‧ Carrier Unit

1201‧‧‧ bottom

1202‧‧‧ Side wall

1203‧‧‧Connecting Department

125‧‧‧ bearing surface

1250‧‧‧Area

150‧‧‧Light source

160‧‧‧Support structure

160a, 160c, 160d‧‧‧ side wall

161a, 161c, 161d‧‧‧ top

162a, 162c, 162d‧‧‧ wall

160b‧‧‧Baffle

160e‧‧‧ rib

160f‧‧‧Support column

200‧‧‧First diffuser

300‧‧‧Optical Control Film

310‧‧‧reflecting surface

330‧‧‧Lighting structure

331‧‧‧ Block

400‧‧‧Second diffusion plate

500‧‧‧Optical diaphragm

700‧‧‧Stained materials

710‧‧‧Under layer

720‧‧‧reflective layer

730‧‧‧Glue layer

T‧‧‧thickness

w‧‧‧Width

P‧‧‧Light Road

[study]

1a‧‧‧Backlight module

2‧‧‧Diffuser

3‧‧‧reflecting film

5‧‧‧Optical diaphragm

8‧‧‧Light source

9a‧‧‧Lightbox

S1‧‧‧Under space

S2‧‧‧Upper space

1 is a side view of a conventional backlight module; FIG. 2A is an exploded view of the embodiment of the backlight module of the present invention; FIG. 2B is a side view of the embodiment shown in FIG. 2A; 2A-2B is an optical path diagram of the embodiment shown in FIGS. 2A-2B; FIG. 3B is a top view of the light source module and the optical control film of the embodiment shown in FIGS. 2A-2B; FIG. 5A to 5E are side views of other embodiments of the backlight module of the present invention; and FIGS. 6A to 6E are side views showing other embodiments of the backlight module of the present invention.

The present invention provides a backlight module for use in a display device. In a preferred embodiment, the display device uses a liquid crystal display panel to cooperate with the backlight module to generate an image. However, in various embodiments, the display device can also cooperate with other display panels that require a backlight module.

In the embodiment shown in FIG. 2A , the backlight module includes a light source module 100 , an optical control film 300 , and a diffusion plate (including, for example, a first diffusion plate 200 and a second diffusion plate 400 ). The light source module 100 includes a carrier 120 and a plurality of light sources 150. Further, the carrier 120 has a bearing surface 125 for carrying the light source 150; the reflectivity of the bearing surface 125 is preferably between 50% and 100%, wherein the reflectance is preferably determined based on the white barium sulfate powder. In comparison, the reflectance of other materials is determined by the reflectance of the white barium sulfate white powder. The carrier plate 120 is preferably made of a metal material such as an aluminum plate; however, in various embodiments, the carrier plate 120 may also be made of a plastic material. When the surface of the carrier 120 directly serves as the bearing surface 125, the material of the carrier 120 can reflect the reflective property of the bearing surface 125; that is, what kind of material is used for the carrier 120, and what kind of reflectivity the carrier 120 has, for example. When the carrier 120 is made of aluminum, its reflectivity is substantially equivalent to the reflectivity of the metallic aluminum. In various embodiments, an additional reflective material may be disposed on the carrier 120, for example, to coat the reflective material to form the bearing surface 125.

The light source 150 is disposed on the bearing surface 125, and is preferably distributed in a matrix matrix manner. In a preferred embodiment, the light source 150 is a light emitting diode light source module. The light source module 100 further includes at least one supporting structure 160 protruding from the bearing surface 125 and located between the adjacent two light sources 150. For example, the support structure 160 may be a columnar structure and disposed or formed on the bearing surface 125 according to the position of the light source 150 distributed in a matrix matrix, and each of the light sources 150 is preferably surrounded by the support structure 160. The support structure 160 may be discontinuously arranged in a columnar structure or may be a continuous whole. In the picture In the embodiment shown in 2A-2B, the support structure 160 is, for example, a side wall 160a raised from the bearing surface 125. The side wall 160a has a top end 161a and two opposite wall surfaces 162a. The wall surface 162a connects the top end 161a and faces the adjacent two light sources 150, respectively. In a preferred embodiment of the present invention, the support structure 160 is translucent, or is a high reflectivity material, or is provided with a highly reflective material on the surface. For example, the reflectivity of the wall surface 162a is preferably between 60% and 100%, but the reflection effect of the bearing surface 125 is better than the reflection effect of the wall surface 162a. In addition, in different embodiments, the wall surface 162a does not necessarily need to have a good reflection effect, and it is not necessary to add a high-reflectance material, and the light-receiving surface is mainly provided by the bearing surface 125 having a good reflection effect.

The support structure 160 can be disposed or formed in a different manner, and the support structure 160 is positioned between adjacent two light sources 150. In other embodiments of the invention, the support structure 160 is projecting from the bearing surface 125 and the compartment bearing surface 125 is a plurality of regions 1250 (Fig. 2A). The support structure 160 may be a continuous unit, or may be spaced apart from the bearing surface 125 by the splicing manner, or may be disposed on the bearing surface 125. As shown in FIGS. 2A-2B , the support structure 160 , for example, the carrier 120 itself is formed on the side wall 160 a of the bearing surface 125 , and the side wall 160 a partition bearing surface 125 is a plurality of regions 1250 . The light sources 150 are preferably disposed in the regions 1250, respectively.

The first diffusion plate 200, the optical control film 300, and the second diffusion plate 400 are stacked, and are supported by the support structure 160 and disposed on the carrier 120 and in the light emitting direction of the light source module 100. The light generated by the light source 150 passes through the optical control film 300 and the diffusion plate to constitute the light output of the backlight module of the present invention. In the preferred embodiment of the present invention, as shown in FIGS. 2A-2B, the optical control film 300 is interposed between the first diffusion plate 200 and the second diffusion plate 400, wherein the thickness of the first diffusion plate 200 is preferably not less than 1 mm; the optical control film 300 may further be at least with the first diffusion plate 200 and the second diffusion plate 400 It is glued. In addition, at least one of the optical control film 300, the first diffusion plate 200, and the second diffusion plate 400 may be formed by splicing a plurality of pieces, and the seam position of the splicing is at least partially projected with the support structure 160 in the direction of the vertical bearing surface 125. overlapping.

The optical control film 300 includes a reflective surface 310 and a plurality of light-emitting structures 330, and light generated by the light-distributing light source 150 is emitted from different positions of the optical control film 300. The light-emitting structure 330 may be a through hole or a structure such as a non-through hole such as an indentation. In a preferred embodiment, the reflective surface 310 is formed on one side of the optical control film 300 toward the light source module 100; the plurality of light emitting structures 330 respectively penetrate the optical control film 300. In the embodiment shown in FIG. 2A, the light-emitting structure 330 is preferably configured to correspond to a plurality of blocks 331 respectively corresponding to different light sources 150. The backlight module 10 distributed by the light source 150 in a column matrix manner is taken as an example, and multiple regions are used. Block 331 is preferably distributed in a matrix matrix manner. The light generated by the light source 150 can be reflected back and forth by the reflective surface 310 and the carrying surface 125, and the optical control film 300 is passed through the light emitting structure 330. Therefore, light from the light source 150 can be distributed by adjusting the number and size of the light-emitting structures 330 at different positions on the optical control film 300. In addition, the aforementioned diffusing plate further homogenizes the light after the light passes through the optical regulating film 300 and/or before entering the optical regulating film 300. The invention improves the defects of the LED mura and the shadow of the junction in the conventional backlight module by the combination of the optical control film and the diffusion plate.

When the first diffusion plate 200 is supported by the support structure 160 and disposed above the light sources 150, the optical control film 300 is stacked on the side of the first diffusion plate 200 opposite to the light source module 100; The two diffusion plates 400 are stacked on one side of the optical diffusion film 300 opposite to the first diffusion plate 200. In the embodiment shown in FIGS. 2A-2B, the side wall 160a may support the first diffusion plate 200 by its top end 161a contacting the bottom surface of the first diffusion plate 200. In summary, the first diffusion plate 200, the optical control film 300, and the second diffusion plate 400 form a sandwich structure, and are supported by the support structure 160 to the light source. Above 150. Under the premise that the support structure 160 stably supports the first diffusion plate 200, the optical control film 300, and the second diffusion plate 400, the support structure 160 preferably has a small top end area/tip width. The first diffusion plate 200, the optical control film 300, and the second diffusion plate 400 are supported by the support structure 160 and can maintain their optimal function.

Further, in the embodiment of the present invention, light from the light source 150 first reaches the first diffusion plate 200. In addition, the light passes through the first diffusion plate 200 to reach the optical control film 300 and the second diffusion plate 400; the first diffusion plate 200 that is in contact with the support structure 160, for example, the side wall 160a, and assists in guiding light to the support structure 160, improving, The shadow caused by the support structure 160 such as the side wall 160a is reduced. The first diffusion plate 200 preferably has a high light transmittance. The light path P of the light on the first diffusion plate 200 is illustrated in FIG. 3A, wherein the thickness of the first diffusion plate 200 provides light to the space above the support structure 160 and is incident on the optical control film 300. For example, when the support structure 160 is larger in area such as the top end 161a of the side wall 160a, the resulting shadow is more conspicuous; at this time, the thickness of the first diffusion plate 200 can be increased to compensate. In the preferred embodiment of the present invention, the thickness of the first diffusion plate 200 is not less than 1 mm; in addition, the relationship between the thickness t of the first diffusion plate 200 and the width w of the top end of the support structure 160 is preferably based on the relationship t>w/4 .

Then, the light from the light source 150 is distributed through the optical control film 300 (described in detail later), the uniformity of the light output of the backlight module is improved, and the mura caused by the LED is solved; the light of the optical control film 300 enters the second diffusion. The board 400 performs light mixing here to improve and reduce the shadow which may be caused by the optical control film, and improve the uniformity of the light output of the backlight module. In addition, the transmittance of the first diffusion plate 200 is preferably greater than the transmittance of the second diffusion plate 400, which also contributes to improving the uniformity of light emission.

As mentioned above, the light-emitting structures 330 may have different numbers and/or sizes at different positions on the optical control film 300, and the number of light-emitting structures 330 on the optical control film 300 per unit area The amount can be regarded as the density of the light exit structure 330. The area occupied by the light-emitting structure 330 on the optical control film 300 may be referred to as a penetration area, and the penetration area contributed by the light-emitting structure 330 on the optical control film 300 per unit area constitutes a unit penetration area ratio of the optical regulation film 300, The meaning is also equivalent to the area ratio (i.e., the unit penetration area ratio) of the light-emitting structure 330 (i.e., the opening) in the optical modulation film 300 of one unit area. The unit penetration area ratio or aperture ratio is preferably a standardized ratio value without a unit. In the embodiment of the present invention, the same optical control film 300 has different unit penetration area ratios. Furthermore, the unit penetration area ratio can vary depending on the distance from the light source 150. In a preferred embodiment of the invention, the penetration area ratio is centered on the projected position of the light source closest to the source 150, and varies according to a predetermined function value of the first function.

Take the example shown in Figure 3B. An embodiment of an optical conditioning film 300 is shown in FIG. 3B. In this embodiment, the optical control film 300 includes a plurality of blocks 331; the blocks 331 are designed according to a preset light source/light source module, and correspond to the respective light sources 150 in actual operation. For example, the optical control film 300 is disposed above the light source module 100, and each block 331 corresponds to each light source 150 in the light source module 100. In the preferred embodiment, the light-emitting structures 330 in each block 331 are distributed identically, similarly, or have a degree of correlation. In each block 331 , the transmittance/unit penetration area ratio of the light-emitting structure 330 is centered on the projection position of the corresponding light source (on the optical control film 300), and is a function of the preset first function. The value varies toward the outside of block 331. In other words, the function value (transmission rate / unit penetration area ratio) of the first function will gradually increase as the distance from the projected position of the light source increases. Furthermore, the first function may vary with the shape of the light source or its symmetrical directionality. The first function is preferably a polynomial function, such as a quadratic or more polynomial function, but is not limited thereto. In an embodiment of the invention, the first function is a polynomial function as follows: Tr = k ₁ d ⁿ + k ₂ d ^n-1 + k ₃ d ^n-2 +.... + k _n d+m Wherein k ₁ ~k _n and m are respectively coefficients adjusted according to optical requirements, d is the distance between the light-emitting structure 310 and the projection position of the light source on the optical control film 300, and Tr is the transmittance/unit penetration of the position. The area ratio is either the penetration rate/unit penetration area ratio after multiplying by one parameter. Wherein, the distance d can be changed according to the elliptic function as follows: d=[(x/a) ² +(y/b) ² ] ^0.5 where a and b are the ellipse length and the short axis coefficient, respectively, and the ellipse center is the light source The center of the projection position; x and y are the distances of the positions in the block 331 from the short and long axes, respectively.

In addition, according to the function value of the elliptic function, that is, the ratio of the aperture ratio/unit penetration area ratio of each block 331 is obtained, the profile is roughly symmetrical, but not limited thereto. With this design, the resulting backlight can be distributed more evenly over the support structure 160.

Furthermore, taking the backlight module of the 75-inch panel as an example, the first function is a polynomial function as shown below: Tr=Ad ² +Bd ^2-1 +CA=0.0001 B=0.0032 C=0 and the distance d is as follows The elliptic function change shown: d=[(x/a) ² +(y/b) ² ] ^0.5 a=1 b=0.92

On the other hand, as shown in FIG. 3B, the optical control film 300 disposed above the light source module 100 is supported by the support structure 160 and disposed on the carrier 120; at this time, the optical control film 300 is partially connected to the support structure 160. The projections overlap. The portion of the optical control film 300 that overlaps with the projection of the support structure 160 has an upper aperture ratio/unit penetration area ratio that is preferably re-transmitted by a weighting value based on the first function, wherein the weighting value is preferably between Between 1.05 and 1.30. In other words, the present invention considers the support structure to optimize the design of the optical control film 300 or the light exit structure.

The weight values can vary depending on the support structure. 2A-2B, the support structure 160 is a side wall 160a, and the side wall 160a has a top end 161a and two opposite wall surfaces 162a respectively facing the adjacent two light sources 150. The wall surface 162a is further inclined with respect to the bearing surface 125, and the cross section of the side wall 160a assumes a trapezoidal shape. At this time, as shown in FIG. 3B, a portion of the optical control film 300 on which the top end 161a of the side wall 160a is projected abuts a portion projected by the wall surface 162a; a portion of the optical control film 300 overlapping the top end 161a (projection) and The partial regions where the wall surface 162a (projection) overlap may have different transmittance/unit penetration area ratio weighting values, respectively. For example, in the portion of the optical modulation film 300 that overlaps the projection of the top end 161a, the ratio of the transmittance/unit penetration area ratio of the light-emitting structures 330 is calculated using the first weighting value; the optical overlapping with the projection of the wall surface 162a In the portion of the control film 300, the transmittance/unit penetration area ratio of the light-emitting structures 330 is calculated using a second weighting value, and the first weighting value is greater than the second weighting value. In an embodiment of the invention, the first weighting value is between 1.2 and 1.3, and the second weighting value is between 1.05 and 1.1. With this arrangement, the shadow formed by the support structure 160 at the projected position of the optical control film 300 can be reduced, further increasing the uniformity of the generated backlight over the support structure 160.

In other embodiments, as in the embodiment shown in FIG. 4, the support structure 160 is partitioned Composition of 160b. For example, when a plurality of regions 1250 are partitioned on the bearing surface 125 in a splicing manner, a plurality of longitudinal and lateral spacers 160b are erected to form a lattice structure; the lattice structure supports the optical control film 300 in the height direction. And the diffusion plate, and the projection on the diffusion plate is a two-dimensional lattice diagram. The optical control film 300 used in combination with the spacer 160b has a smaller width at the top end of the spacer 160b than the side wall used in the embodiment of FIGS. 2A-2B according to the first function and the weighting value. The portion projected by the partition 160b may have a smaller unit penetration area ratio.

5A-5B again illustrate other embodiments of the support structure 160 of the present invention. As shown in FIG. 5A, the support structure 160 is a side wall 160c; the side wall 160c has an opposite side to the bearing surface 125 with respect to the two wall surfaces 162c. However, compared with the side wall 160a shown in FIG. 2B, the top end 161c of the side wall 160c in this example is substantially at the boundary with respect to the two wall surfaces 162c and is an edge. This also effectively reduces the backlight shadow caused by the support structure 160, and the two-dimensional lattice structure formed by the top end 161a of the side wall 160c is also sufficient to provide good support for the diffusion plate and the optical control film 300.

Furthermore, as shown in FIG. 5B, the support structure 160 is a side wall 160d. The side wall 160d also has a relatively opposite wall surface 162d inclined with respect to the bearing surface 125, and the side wall 160d has a top end 162d formed into a rounded corner. On the one hand, the contact area between the support structure 160 and the diffusion plate is increased, and on the other hand, the backlight shadow caused by the support structure 160 can be effectively reduced.

Figures 5C-5E further illustrate other embodiments of the support structure 160 of the present invention. The embodiment of FIGS. 5C and 6D is such that the support structure 160 is formed by the carrier 120 itself. The embodiment of FIG. 5E is further provided with a support structure 160 on the carrier 120. As shown in FIG. 5C, the support structure 160 is a rib 160e formed by processing the carrier 120; the rib 160e protrudes from the bearing surface 125 to support the diffusion plate and the optical control film 300. In addition, the ribs 160e simultaneously enhance the rigidity of the carrier 120 as a whole to reduce the chance of deflection.

In the embodiment of FIG. 5D, the carrier 120 may be composed of a plurality of carrier units 1200; while the carrier unit 1200 constitutes the carrier 120, adjacent to the carrier unit 1200 and constituting the support structure 160. For example, the carrier unit 1200 has a bottom portion 1201, a side wall 1202 surrounding the bottom portion, and a connecting portion 1203 extending from the side wall 1202 toward the outside of the carrier unit 1200. The connecting portion 1203 may be connected or partially overlapped. The bottom portion 1201 of the plate unit 1200 corresponds to the bearing surface 125 on the one hand, and the bottom portion 1201 also corresponds approximately to the block 1250 on the other hand. The plurality of carrier units 1200 are spliced to each other to form the carrier 120, and support the diffusion plate and the optical control film 300. Comparing the embodiment of FIG. 5D with the embodiment of FIGS. 2A-2B, the side wall 1202 of the carrier unit 1200 in FIG. 5D is equivalent to the wall surface 162a of the side wall 160a in FIGS. 2A-2B, and the adjacent carrier unit 1200 is spliced to each other. The connecting portion 1203 corresponds to the top end 161a of the side wall 160a. With this design, the smaller carrier units 1200 can be combined into a complete carrier 120 in a combined manner, rather than using a mold to directly form a complete carrier 120, thereby saving on the cost of the mold.

As shown in Figure 5E, the support structure 160 is provided by a support post 160f. In this embodiment, the support column 160f may be a continuous whole disposed on the bearing surface 125, or a plurality of longitudinal and lateral support columns 160f may be disposed on the bearing surface 125 and spliced into the supporting structure 160. The support post 160f can be selected or replaced with the carrier 120 and/or the optical conditioning film 300. In a preferred implementation of the present invention, the support post 160f may be made of a light transmissive material, a high reflectivity material, or a highly reflective material disposed on the surface.

The optically-regulated film 300 and the diffusing plate are supported on the supporting structure 160. The optical regulating film 300 is interposed between the first diffusing plate 200 and the second diffusing plate 400, and the optical regulating film 300 can be further combined with the first At least one of the diffusion plate 200 and the second diffusion plate 400 is glued to increase the degree of fixation between the optical control film 300 and the first diffusion plate 200 and/or the second diffusion plate 400. The glue 700 for the glue point is preferably a transparent glue or an optical glue. As shown in FIG. 6A, the phase of the optical control film 300 The two sides may be glued to the first diffusion plate 200 and the second diffusion plate 400 respectively; as shown in FIGS. 6B to 6C, the optical control film 300 may be glued to the first diffusion plate 200 or the second diffusion plate 400.

The glue on the optical control film 300 and the first diffusion plate 200 and the second diffusion plate 400 are carried out in such a manner that they can be glued; in other words, the glue 700 is applied only to the localized area on the optical control film 300 instead of all. The design of the glue point is based on the premise that the light quality is not affected. The glue point preferably overlaps at least partially with the projection range of the light source 150 on the optical conditioning film 300. As shown in the embodiment of FIG. 6D, the glue points are distributed over portions of the optical conditioning film 300 and are positioned directly above the light source 150. Since the optical control film 300 preferably has a minimum transmittance/unit penetration area ratio at a corresponding position directly above the light source 150, the effect of the glue on the optical performance here will be reduced.

The glue material can be combined with the reflective material to enhance the reflection effect. As shown in FIG. 6E, the glue 700 further includes a under layer 710, a reflective layer 720, and a sizing layer 730. The underlying layer 710 is disposed on the first diffusing plate 200; the reflective layer 720 is disposed on the surface of the lowering layer 710 facing away from the first diffusing plate 200 for enhancing the reflection effect; the adhesive layer 730 is disposed on the reflective layer 720 One side of the layer 710 is attached to the optical control film 300. With this arrangement, the effect on the optical performance due to the glue 700 can be reduced.

The present invention has been described by the above-described related embodiments, but the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, modifications and equivalents of the spirit and scope of the invention are included in the scope of the invention.

10‧‧‧Backlight module

100‧‧‧Light source module

120‧‧‧ Carrier Board

125‧‧‧ bearing surface

1250‧‧‧Area

150‧‧‧Light source

160‧‧‧Support structure

160a‧‧‧Side wall

200‧‧‧First diffuser

300‧‧‧Optical Control Film

330‧‧‧Lighting structure

331‧‧‧ Block

400‧‧‧Second diffusion plate

500‧‧‧Optical diaphragm

Claims (20)

A backlight module includes: a light source module, comprising: a carrier plate having a bearing surface; a plurality of light sources respectively disposed on the bearing surface; and at least one supporting structure protruding from the bearing surface, and Located between two adjacent light sources; a first diffusion plate disposed above the light source and supported by the support structure; an optical control film stacked on the first diffusion plate opposite to the light source module One of the sides; wherein the optical control film comprises a plurality of light-emitting structures, wherein in the portion of the optical control film that is not overlapped with the projection of the support structure, a unit penetration area ratio of the light-emitting structures is projected closest to the light source The position is centered according to a function value of a first function whose distance is a variable, wherein the distance is a distance between the light-emitting structures and a closest projection position of the light source; and the optical control film overlaps with the projection of the support structure In the portion, the unit penetration area ratio of the light-emitting structures is multiplied by a weight value change according to a function value of the first function centered on the closest projection position of the light source, the weight value Is between 1.05 to 1.30; and a second diffusion plate, an optical stack disposed on the regulation of the film opposite to the first side of the diffusion plate. The backlight module of claim 1, wherein the support structure is formed as a side wall having a top end and a opposite wall surface, the two wall surfaces connecting the top end and respectively facing the adjacent two of the light sources The top end is in contact with the surface of the first diffusion plate relative to the optical control film. The backlight module of claim 2, wherein the wall surface is inclined with respect to the bearing surface; and the portion of the optical control film overlapped with the top projection is used for calculating a unit penetration area ratio of the light-emitting structures The weighting value is a first weighting value; in the portion of the optical regulating film that overlaps the wall projection, the ratio of the unit penetration area ratio of the light-emitting structures is used The weighting value is a second weighting value; the first weighting value is greater than the second weighting value. The backlight module of claim 3, wherein the first weighting value is between 1.2 and 1.3. The backlight module of claim 3, wherein the second weighting value is between 1.05 and 1.1. The backlight module of claim 1, wherein the value of the thickness of the first diffusion plate is four times greater than the width of the top end of the support structure. The backlight module of claim 1, wherein the optical control film is glued to at least one of the first diffusion plate and the second diffusion plate. The backlight module of claim 7, wherein a glue point of the optical control film and the first diffusion plate or the second diffusion plate at least partially overlaps a projection range of the light source on the optical control film. The backlight film set of claim 8, wherein the optical control film and the first diffusion plate are glued at the glue point by a glue material, the glue material comprises: a glue layer, and the first diffusion plate is attached a reflective layer disposed on the back surface of the first diffusion plate; and a glue layer disposed on the surface of the reflective layer facing away from the underlying layer and conforming to the optical control film. The backlight module of claim 1, wherein at least one of the optical control film, the first diffusion plate and the second diffusion plate is formed by splicing a plurality of pieces, and the seam position of the splicing is at least partially The support structure projection overlaps. A backlight module includes: a light source module, comprising: a carrier board having a bearing surface and at least one side wall, wherein the side wall is protruded from the bearing surface, and the bearing surface is divided into a plurality of areas And a plurality of light sources respectively disposed on the blocks; a first diffusion plate disposed above the light sources and supported by the side walls; An optical control film is disposed on a side of the first diffusion plate opposite to the light source module; wherein the optical control film comprises: a reflective surface formed on the side of the optical control film facing the light source module And a plurality of light-emitting structures respectively penetrating the optical control film; wherein, in the portion of the optical control film that is not overlapped with the sidewall projection, the unit penetration area ratio of the light-emitting structures is the closest to the light source projection position The value of the function of the first function according to the distance as a variable, wherein the distance is the distance between the light-emitting structures and the closest projection position of the light source; and the portion of the optical control film overlapping the projection of the side wall The unit penetration area ratio of the light-emitting structures is multiplied by a weight value change according to a function value of the first function centered on the closest projection position of the light source, and the weight value is between 1.05 and 1.30; And a second diffusion plate stacked on the side of the optical diffusion film opposite to the first diffusion plate. The backlight module of claim 11, wherein the side wall has a top end and a opposite wall surface, the two wall surfaces are connected to the top end and respectively face the adjacent two light sources, the top end is in contact with the first diffusion board Relative to the surface of the optical control film. The backlight module of claim 12, wherein the wall surface is inclined with respect to the bearing surface; wherein the portion of the optical control film overlapped with the top projection is used for calculating a unit penetration area ratio of the light-emitting structures The weighting value is a first weighting value; in the portion of the optical regulating film that overlaps the wall projection, the weighting value used in calculating the unit penetration area ratio of the light emitting structures is a second weighting value The first weighting value is greater than the second weighting value. The backlight module of claim 13, wherein the first weighting value is between 1.2 and 1.3. The backlight module of claim 13, wherein the second weighting value is between 1.05 and 1.1. The backlight module of claim 11, wherein the value of the thickness of the first diffusion plate is four times greater than the width of the top end of the support structure. The backlight module of claim 11, wherein the optical control film is glued to at least one of the first diffusion plate and the second diffusion plate. The backlight module of claim 17, wherein a glue point of the optical control film and the first diffusion plate or the second diffusion plate at least partially overlaps a projection range of the light source on the optical control film. The backlight film set of claim 18, wherein the optical control film and the first diffusion plate are glued at the glue point by a glue material, the glue material comprises: a rubber layer, and the first diffusion plate is attached a reflective layer disposed on the back surface of the first diffusion plate; and a glue layer disposed on the surface of the reflective layer facing away from the underlying layer and conforming to the optical control film. The backlight module of claim 11, wherein at least one of the optical control film, the first diffusion plate and the second diffusion plate is formed by splicing a plurality of pieces, and the seam position of the splicing is at least partially The side wall projections overlap.