TW201621426A - Backlight module - Google Patents

Abstract

A backlight module including a plurality of light emitting elements, a plurality of lenses, and a diffusion plate is provided. The light emitting elements are capable of providing a light beam, repectively. Each lens is disposed above each corresponding light emitting element. The diffusion plate is disposed above the lens. A plurality of net point regions are disposed on a surface of the diffusion plate facing the lens, wherein the net point regions are corresponding to the light emitting devices. The net point regions have a plurality of net points. Each of the net point regions is corresponding to each of the light emitting elements and each of the net point regions includes a plurality of net point sub-regions, wherein the colors of the net points of at least two of the net point sub-regions are different.

Description

Backlight module

The invention relates to a light source module, and in particular to a backlight module.

The existing direct-lit light-emitting diode (LED) backlight module, because the efficiency of the light-emitting diode is improved with the advancement of technology, a smaller number of light-emitting diodes can be used to achieve the backlight module. Optical brightness requirements. However, due to the reduced number of light-emitting diodes and the arrangement of the diverging lens to reduce the thickness of the backlight module, the diffusing plate of the backlight module will generate a halo of different regions corresponding to the plurality of diverging lenses. In particular, the position of the diffusing plate corresponding to a single diverging lens may also produce a bright band, which causes the backlight module to be uneven in brightness and brightness, which affects the taste of the picture.

In general, in order to solve the problem of uneven brightness of the backlight module screen, it can be improved by printing the dot pattern on the diffusion plate. However, the current dot patterns are often printed on the diffusion plate in a uniformly distributed manner, but the bright band problem corresponding to the position of the single diverging lens on the diffusion plate cannot be improved, and the picture is still uneven, thereby affecting the overall picture taste. Therefore, how to improve the unevenness of the picture of the backlight module having the diverging lens is a problem still to be solved.

Taiwan Patent No. I406057 discloses a backlight module including a diffusion plate on which a plurality of dots are disposed. Chinese Patent No. 103592705A discloses a diffusing plate of a backlight module, which is provided with a reflective mesh point on one side facing the light source. Chinese Patent No. 103728774A discloses a reflection sheet on which a plurality of dots are disposed. Chinese Patent No. 103675989A discloses a printed diffusion plate having a plurality of dots disposed thereon and a blue phosphor added to the dot ink.

The invention provides a backlight module with high uniformity and good picture taste.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a backlight module. The backlight module includes a plurality of light emitting elements, a plurality of lenses, and a diffusion plate. The illuminating elements are adapted to provide a respective beam of light. Each lens is correspondingly disposed above each of the light emitting elements. The diffusing plate is disposed above the lenses, and a plurality of dot blocks are disposed on a surface of the diffusing plate facing the lens. These dot blocks have multiple dots. Each of the halftone dot blocks corresponds to each of the light emitting elements, and each of the halftone dot blocks includes a plurality of subnet point blocks, wherein at least two of the subnet point blocks have different colors.

In an embodiment of the invention, the center position of each of the halftone dot blocks corresponds to a central position of each of the light emitting elements, and a subnet point area of each of the halftone dot blocks The block includes a first subnet point block and a second subnet point block, the first subnet point block is located at a center position of the network point block, and the second subnet point block is annular and surrounds the first subnet point block. .

In an embodiment of the invention, the network point of the first subnet point block includes a plurality of first color diffusion particles, and the network points of the second subnet point block comprise a plurality of second color diffusion particles.

In an embodiment of the invention, the first color diffusing particles are yellow diffusing particles, and the second color diffusing particles are blue diffusing particles.

In an embodiment of the present invention, the density of the dots located in the first sub-site block is gradually decreased along the direction away from the center position of the half-point block, and then increases to the second sub-point block, and The density of the dots located at the periphery of the second sub-site block is gradually decreasing in a direction away from the center position of the halftone block.

In an embodiment of the present invention, the size of the network points located in the first sub-network point block is arranged in a direction away from a central position of the network point block, and then to the second sub-point point block. The directions are arranged from small to large, and the sizes of the dots located at the periphery of the second sub-point block are arranged from large to small in a direction away from the center position of the halftone block.

In an embodiment of the invention, the size of the dot is substantially between 0.1 mm and 1.0 mm or less.

In an embodiment of the invention, the dots are white ink, yellow ink, blue ink or black ink.

In an embodiment of the invention, the backlight module further includes a back a board in which the light emitting elements are disposed on the backboard.

In an embodiment of the present invention, the backlight module further includes a reflective unit disposed on the backplane and located at a periphery of the light-emitting elements, and a plurality of annular dots are disposed on a surface of the reflective unit facing the diffuser Block, the ring-shaped dot block has a plurality of mesh points, each ring-shaped dot block surrounds each of the light-emitting elements, and each of the ring-shaped dot blocks includes a third sub-point block, and the third sub-point block The dot comprises a plurality of third color diffusing particles.

In an embodiment of the invention, the material of the third color diffusing particle is a black ink.

In an embodiment of the present invention, each of the ring-shaped network dot blocks further includes a fourth sub-network point block, the fourth sub-network point block surrounds the third sub-network point block, and the fourth sub-network point block The dot comprises a plurality of fourth color diffusing particles.

In an embodiment of the invention, the third color diffusing particles are yellow diffusing particles, and the fourth color diffusing particles are blue diffusing particles.

In an embodiment of the invention, the density of the dots located in the third sub-point block is increasing toward the fourth sub-site block, and the density of the dots located at the periphery of the fourth sub-point block is along The direction away from the light-emitting elements is gradually reduced.

In an embodiment of the present invention, the size of the network points located in the third sub-point point block is a small to large arrangement in the direction of the fourth sub-network point block, and the network points located at the periphery of the fourth sub-network point block. The dimensions are arranged from large to small along the direction away from the light-emitting elements.

In an embodiment of the invention, each of the nets on the diffuser plate described above The area of the dot block projection on the reflective unit is larger than the area of each annular dot block located on the reflective unit.

Based on the above, embodiments of the present invention can achieve at least one of the following advantages or effects. The backlight module of the embodiment of the present invention can achieve good light uniformity and picture taste by the distribution density of the dots of each dot block located on the diffusion plate. Moreover, by adding different colors of diffusion particles or ink materials in the dots of different subnet point blocks of each dot block of the diffusion plate, color and brightness adjustment can be performed for different regions of the screen, thereby enabling Achieve good picture taste. In addition, the backlight module of the embodiment of the present invention can achieve good light uniformity and picture taste by the distribution density of the dots of each dot block located on the reflecting unit. Moreover, by adding different colors of diffusion particles or ink materials in the dots of different subnet point blocks of each dot block of the reflection unit, color and brightness adjustment can be performed for different regions of the screen, thereby enabling Achieve good picture taste.

The above described features and advantages of the invention will be apparent from the following description.

60‧‧‧ Beam

100, 300, 400, 600‧‧‧ backlight module

110‧‧‧Lighting elements

120‧‧‧ lens

130‧‧‧ Backplane

140, 340‧‧‧ diffusing plate

150, 450, 650‧ ‧ reflection unit

C1, C2‧‧‧ Center

PR‧‧‧ outlet block

PS, PS3, PS4‧‧‧ subnet point block

PS1‧‧‧First Subnet Point Block

PS2‧‧‧Second Subnet Point Block

CR‧‧‧ ring network block

CS1‧‧‧ third subnet point block

CS2‧‧‧4th subnet point block

NP‧‧‧ outlets

H‧‧‧ spacing

S1, S2, S3‧‧‧ surface

FIG. 1 is a partial cross-sectional view of a backlight module according to an embodiment of the invention.

2 is a bottom view of the diffuser plate of the backlight module of FIG. 1.

3 is a partial cross-sectional view showing a backlight module according to another embodiment of the present invention.

4 is a partial cross-sectional view showing a backlight module according to still another embodiment of the present invention.

FIG. 5 is a top plan view of a reflection unit of the backlight module of FIG. 4. FIG.

FIG. 6 is a partial cross-sectional view showing a backlight module according to still another embodiment of the present invention.

The foregoing and other objects, features, and advantages of the present invention will be apparent from the Detailed Description The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

FIG. 1 is a partial cross-sectional view of a backlight module according to an embodiment of the invention. 2 is a bottom view of the diffuser plate of the backlight module of FIG. 1. Referring to FIG. 1 , the backlight module 100 of the present embodiment includes a plurality of light emitting elements 110 , a plurality of lenses 120 , a back plate 130 , a diffusion plate 140 , and a reflection unit 150 . For example, in the embodiment, the light-emitting element 110 is, for example, a light-emitting diode, but the invention is not limited thereto, and other suitable point light sources can also be used as the light-emitting element 110. Specifically, as shown in FIG. 1, the light emitting element 110 is disposed on the back plate 130 and is adapted to provide a light beam 60, respectively. The reflecting unit 150 is disposed on the back plate 130 and located at the periphery of the light emitting element 110. In addition, each lens 120 is disposed correspondingly above each of the light emitting elements 110.

In more detail, in the present embodiment, the lens 120 can be used to cause the light beam 60 provided by the light-emitting element 110 to be further diverged, so that the divergence angle of the light beam 60 can be made large after the light beam 60 passes through the lens 120, respectively. That is, the beam 60 can be The range of the area irradiated on the diffusion plate 140 becomes large. When the range of the area where the light beam 60 is irradiated on the diffusion plate 140 becomes large, it is possible to maintain better light uniformity while reducing the required pitch H (i.e., the light mixing distance) of the diffusion plate 140 with respect to the light-emitting element 110. Thus, the overall thickness of the backlight module 100 can be effectively reduced while providing better light uniformity.

On the other hand, as shown in FIG. 1 and FIG. 2, in the present embodiment, the diffusion plate 140 is disposed above the lenses 120, and the diffusion plate 140 has an opposite surface S1 and a surface S2, wherein the surface of the diffusion plate 140 S1 is a light incident surface, and surface S2 is a light emitting surface, and is, for example, a light emitting surface of the backlight module 100. A plurality of halftone dot blocks PR are disposed on the surface S1 of the diffusion plate 140 facing the lens 120. In detail, these halftone dot blocks PR have a plurality of halftone dots NP. Specifically, in the present embodiment, each of the halftone dot blocks PR corresponds to each of the light emitting elements 110, and the center C1 position of each of the halftone dot blocks PR corresponds to the center C2 position of each of the light emitting elements 110. In more detail, as shown in FIG. 2, in the present embodiment, each of the halftone dot blocks PR includes a plurality of subnet point blocks PS. Moreover, the subnet point block PS of each of the network point blocks PR includes a first subnet point block PS1 and a second subnet point block PS2, wherein the first subnet point block PS1 is located at the center C1 position of the half point block PR. The second subnet point block PS2 is annular and surrounds the first subnet point block PS1.

In this embodiment, the size of the dot NP of the backlight module 100 is the same. For example, the size of the dot NP falls substantially between 0.1 mm and 1.0 mm or less to avoid the dot NP being used by the user. Observed. It should be noted that the numerical ranges herein are for illustrative purposes only and are not intended to The invention is defined. Specifically, in the embodiment, by setting the halftone dot NP on the surface S1 of the diffusing plate 140 facing the lens 120, the light beam 60 can be partially reflected, and the bright halo problem of the backlight module 100 can be eliminated to provide a comparison. Good light uniformity.

Further, in this embodiment, the manner in which the backlight module 100 can diffuse the light beam 60 to provide light uniformity is achieved by using the distribution density of the dot NP. For example, since the center C1 position of each dot block PR on the diffusion plate 140 is relatively close to the light-emitting element 110, the light intensity of the light beam 60 is received, so that the density of the dot NP can be designed as The position near the center C2 of the corresponding light-emitting element 110 (or the position near the center C1 of the halftone dot block PR) is large. In addition, since the light beam 60 emitted by the light-emitting element 110 also produces a bright band on the diffusion plate 140 due to the reflection and refraction of the lens 120, it may also correspond to the bright band region on the diffusion plate 140 (in the present embodiment, That is, the halftone dot NP density of the range of the second subnet point block PS2 is designed to be large.

For example, as shown in FIG. 2, in this embodiment, the density of the halftone dots NP located in the first subnet point block PS1 is gradually decreased along the direction away from the center C1 position of the halftone dot block PR, and then The two subnet point blocks PS2 are gradually increased, and the density of the halftone dots NP located at the periphery of the second subnet point block PS2 is gradually decreased in a direction away from the center C1 position of the halftone dot block PR. That is to say, in the first sub-network point block PS1 on the diffusion plate 140 opposite to the center C2 of each of the light-emitting elements 110, the received light beams 60 are concentrated, and therefore, the dots of the first sub-network point block PS1 are The NP density is designed to be large. On the other hand, the second sub-dot point block PS2 on the diffusion plate 140 corresponds to the bright band area, and its dot NP density is designed to be the largest. Located at the first subnet point The subnet point block PS3 between the block PS1 and the second subnet point block PS2 has a weaker received beam intensity, so its mesh point NP density can be smaller than the first subnet point block PS1 and the second subnet point block PS2. The dot NP density. Similarly, the subnet point block PS4 located at the periphery of the second subnet point block PS2 can be designed to be smaller because its received beam intensity is weak. In this way, the backlight module 100 can eliminate the bright halo by adjusting the dot NP density of the different subnet point blocks PS, and can provide better light uniformity.

In more detail, in the embodiment, the material of the dot NP is different from the material of the diffusing plate 140, wherein the dot NP can be formed on the diffusing plate 140 by printing, so the material of the dot NP can be a material such as ink. . For example, in this embodiment, the material of the dot NP includes white ink, yellow ink, blue ink or black ink, and can be further adjusted for the brightness and taste of the screen.

Further, since the light beam is scattered by the mesh point NP, a color shift problem of the picture will occur. Therefore, in this embodiment, the dot NP may be doped with diffusing particles of different colors for diffusing the light beam passing therethrough, and Adjust the color cast of the screen. For example, when the dot NP only uses the material of the white ink, the screen corresponding to the first subnet point block PS1 in the backlight module 100 will appear blue in color, and the screen corresponding to the second subnet point block PS2. In this embodiment, the dot NP of at least two sub-site point blocks PS has different colors to adjust the color of the screen of the backlight module 100 in different regions. Partial problems, which in turn can improve the overall picture taste.

Further, in this embodiment, the network of the first subnet point block PS1 The dot NP includes a plurality of first color diffusing particles, and the halftone dot NP of the second sub-dot point block PS2 includes a plurality of second color diffusing particles. In more detail, in the present embodiment, the first color diffusion particles are yellow diffusion particles, and the second color diffusion particles are blue diffusion particles. In this way, the color shift of the screen of the backlight module 100 in different regions can be adjusted, and the color blue of the screen corresponding to the first sub-point point block PS1 is eliminated, and the second sub-point block PS2 is corresponding. The picture shows a yellowish color shift phenomenon, which in turn achieves a good picture taste. When black ink is added to the dot NP material of the different subnet point block PS, since the black ink can absorb part of the light beam to reduce the brightness, by adding black ink to the dot NP material, the brightness of different areas of the screen can be performed. Adjust, and then achieve a good picture taste.

It should be noted that, in the foregoing embodiment, the size of the dot NP of each dot block PR of the backlight module 100 is the same, and the distribution density of the dot NP is adjusted to achieve good light uniformity and picture. Taste, but the invention is not limited thereto. In other embodiments, the dot NP of each dot block PR on the diffusion plate 140 may have different sizes along different positions to achieve good light uniformity and picture taste. The following will be further explained in conjunction with FIG. 3.

3 is a partial cross-sectional view showing a backlight module according to another embodiment of the present invention. Referring to FIG. 3, in the embodiment, the backlight module 300 of FIG. 3 is similar to the backlight module 100 of FIG. 1, and the differences are as follows. Specifically, as shown in FIG. 3, in the embodiment, the size of the halftone dot NP in the first sub-network point block PS1 of the diffusion plate 340 of the backlight module 300 is along the center C1 away from the halftone dot block PR. The direction of the position is arranged from large to small, and then the direction of the second sub-point block PS2 is small to The size of the dots NP located at the periphery of the second sub-site dot block PS2 is arranged in a large-to-small direction away from the center C1 position of the halftone dot block PR.

That is, in the present embodiment, the first sub-network point block PS1 on the diffuser plate 340 opposite to the center C2 of each of the light-emitting elements 110 is concentrated, so that the first sub- The dot size NP size of the dot block PS1 is designed to be large. On the other hand, the second sub-site point block PS2 on the diffusion plate 340 corresponds to the bright band area, and its halftone dot NP size is designed to be the largest. The subnet point block PS3 located between the first subnet point block PS1 and the second subnet point block PS2 is weaker in its received beam intensity, so its mesh point NP size can be smaller than the first subnet point block PS1 and the first The dot size NP size of the second subnet point block PS2. Similarly, the subnet point block PS4 located at the periphery of the second subnet point block PS2 can be designed to be smaller because its received beam intensity is weak. In this way, the backlight module 300 can eliminate the bright halo by adjusting the dot size NP of the different subnet point blocks PS, and can provide better light uniformity.

On the other hand, in the embodiment, the backlight module 300 can also add different colors of diffusion particles or ink materials in the dot NP of the different subnet point blocks PS on the diffusion plate 340, so that the backlight module 300 can also be used for the screen. The adjustment of color and brightness in different regions can achieve good picture taste, and has similar advantages and effects as those of the backlight module 100 described above, and will not be described herein.

4 is a partial cross-sectional view showing a backlight module according to still another embodiment of the present invention. FIG. 5 is a top plan view of a reflection unit of the backlight module of FIG. 4. FIG. In this embodiment, the backlight module 400 of FIG. 4 is similar to the backlight module 100 of FIG. 1 , and the differences are as follows Said. Specifically, referring to FIG. 4 and FIG. 5 , in the embodiment, a reflective unit 450 of the backlight module 400 faces a surface S3 of the diffusion plate 140 and is provided with a plurality of annular dot blocks CR, and the ring-shaped dots The block CR has a plurality of network points NP, each of the ring-shaped network dot blocks CR surrounds each of the light-emitting elements 110, and each of the ring-shaped network dot blocks CR includes a third sub-network point block CS1, and the third sub-network point block CS1 The dot NP includes a plurality of third color diffusing particles. For example, in the embodiment, the material of the third color diffusing particles is a black ink. In this way, the backlight module 400 can adjust the brightness of the screen in different areas by adjusting the configuration of the network point NP of the third sub-point block CS1, thereby achieving a good picture taste, but the invention is not limited thereto.

In the embodiment, the backlight module 400 can also adjust the distribution density of the dot NP of the reflecting unit 450 to achieve good light uniformity and picture taste. For example, as shown in FIG. 5, in this embodiment, each ringtone dot block CR further includes a fourth subnet point block CS2, and the fourth subnet point block CS2 surrounds the third subnet point block CS1. . In more detail, in this embodiment, the density of the halftone points NP located in the third subnet point block CS1 is increasing toward the fourth subnet point block CS2, and the halftone point NP located at the periphery of the fourth subnet point block CS2. The density is gradually decreasing in a direction away from the light emitting element 110.

Further, in the present embodiment, since the fourth sub-network point block CS2 on the reflection unit 450 corresponds to the bright band area and is easily received by the light beam reflected thereto, the dot NP density thereof is designed to be large. The periphery of the third subnet point block CS1 and the fourth subnet point block CS2, because the received reflected beam intensity is weak, the NP density of the network point may be smaller than the NP density of the fourth subnet point block CS2. degree. In this way, the backlight module 400 can eliminate the bright halo by adjusting the density of the dot NP of the different subnet point blocks CS on the reflective unit 450, and can provide better light uniformity.

In addition, as shown in FIG. 4 and FIG. 5, in the present embodiment, since the position of the bright band of the light reflected by the diffusing plate 140 to the reflecting unit 450 is relatively close to the light emitting element 110, each annular dot of the reflecting unit 450 is provided. The dot NP of the block CR is also disposed at a position closer to the light-emitting element 110. That is to say, in the present embodiment, the area of each of the halftone dots PR on the diffusing plate 140 projected on the reflecting unit 450 is larger than the area of each of the annular dot blocks CR located on the reflecting unit 450.

On the other hand, in the above embodiment, the material of the third color diffusion particles of the third sub-site block CS1 of the backlight module 400 is exemplified by a black ink, but the invention is not limited thereto. In another embodiment, the color difference between the third subnet point block CS1 and the fourth subnet point block CS2 may be different to adjust the color shift of the screen of the backlight module 400 in different areas. In turn, the overall picture taste can be improved. For example, in this embodiment, the halftone dot NP of the fourth sub-network point block CS2 includes a plurality of fourth color diffusing particles, and the third color diffusing particles are yellow diffusing particles, and the fourth color diffusing particles are blue. Diffused particles. In this way, the color shift of the screen of the backlight module 400 in different regions can be adjusted to achieve a good picture taste.

In addition, in the foregoing embodiment, the backlight module 400 can also achieve good light uniformity and picture taste by the distribution density of the dot NP of each dot block PR located on the diffusion plate 140. And, by each of the diffusion plates 140 Different meshes of different subnet point blocks of the dot PR block are added with different colors of diffusion particles or ink materials, so that the color and brightness can be adjusted for different areas of the screen, thereby achieving good picture taste, and The advantages and effects similar to those of the backlight module 100 described above are not described herein.

FIG. 6 is a partial cross-sectional view showing a backlight module according to still another embodiment of the present invention. Referring to FIG. 6, in the embodiment, the backlight module 600 of FIG. 6 is similar to the backlight module 400 of FIG. 4, and the differences are as follows. Specifically, as shown in FIG. 6, in the embodiment, the size of the halftone dot NP located in the third subnet point block CS1 is arranged from the small to the large in the direction of the fourth subnet point block CS2, and is located at the The size of the halftone dots NP at the periphery of the four sub-site dot block CS2 is arranged in a direction away from the light-emitting element 110 from large to small. In other words, in the embodiment, the backlight module 600 can make the dot NP of each annular dot block CR on the reflective unit 650 have different sizes according to different positions to eliminate the bright halo, and can provide better. Light uniformity.

In addition, in the embodiment, the backlight module 600 can also achieve good light uniformity and picture taste by the distribution density of the dot NP of each dot block PR located on the diffusion plate 140. Moreover, different colors of diffusion particles or ink materials may be added in the dot NP of each dot block PR of the diffusion plate 140 or the dot NP of each ring dot block CR on the reflection unit 650. Therefore, it is also possible to adjust the color and brightness for different areas of the screen, thereby achieving good picture taste, and having similar advantages and effects as the backlight module 400 described above, and will not be described herein.

In summary, the embodiment of the present invention has at least one of the following advantages. In other words, the backlight module of the embodiment of the present invention can achieve good light uniformity and picture taste by the distribution density of the dots of each dot block located on the diffusion plate. Moreover, by adding different colors of diffusion particles or ink materials in the dots of different subnet point blocks of each dot block of the diffusion plate, color and brightness adjustment can be performed for different regions of the screen, thereby enabling Achieve good picture taste. In addition, the backlight module of the embodiment of the present invention can achieve good light uniformity and picture taste by the distribution density of the dots of each dot block located on the reflecting unit. Moreover, by adding different colors of diffusion particles or ink materials in the dots of different subnet point blocks of each dot block of the reflection unit, color and brightness adjustment can be performed for different regions of the screen, thereby enabling Achieve good picture taste.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are all It is still within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. In addition, the terms "first", "second" and the like mentioned in the specification or the scope of the claims are only used to name the elements or distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

60‧‧‧ Beam

100‧‧‧Backlight module

110‧‧‧Lighting elements

120‧‧‧ lens

130‧‧‧ Backplane

140‧‧‧Diffuser

150‧‧‧reflection unit

C1, C2‧‧‧ Center

PR‧‧‧ outlet block

PS3, PS4‧‧‧ subnet point block

PS1‧‧‧First Subnet Point Block

PS2‧‧‧Second Subnet Point Block

NP‧‧‧ outlets

H‧‧‧ spacing

S1, S2‧‧‧ surface

Claims (16)

A backlight module includes: a plurality of light emitting elements adapted to respectively provide a light beam; a plurality of lenses each corresponding to each of the light emitting elements; and a diffusing plate disposed above the lenses a plurality of dot blocks are disposed on a surface of the diffusing plate facing the lenses, wherein the dot blocks have a plurality of dots, each of the dot blocks corresponding to each of the light emitting elements, and each of the dot blocks The plurality of subnet point blocks are included, wherein at least two of the subnet point blocks have different colors. The backlight module of claim 1, wherein a center position of each of the halftone dot blocks corresponds to a center position of each of the light emitting elements, and the plurality of subnet point blocks of each of the halftone dot blocks comprise a first subnet point block and a second subnet point block, the first subnet point block is located at a center position of the network point block, the second subnet point block is annular, and surrounds the first subnet point Block. The backlight module of claim 2, wherein the network points of the first sub-network point block comprise a plurality of first color diffusion particles, and the network points of the second sub-network point block comprise a plurality of The second color diffuses the particles. The backlight module of claim 3, wherein the first color diffusing particles are yellow diffusing particles, and the second color diffusing particles are blue diffusing particles. The backlight module of claim 2, wherein the first The density of the network points in the subnet point block is gradually decreased along the direction away from the center position of the network point block, and then increases to the second subnet point block, and is located at the periphery of the second subnet point block. The density of the dots is gradually decreasing in a direction away from the center of the dot block. The backlight module of claim 2, wherein the sizes of the plurality of dots located in the first sub-site block are arranged in a direction away from a central position of the halftone block, from large to small. The direction of the second subnet point block is arranged from small to large, and the sizes of the network points located at the periphery of the second subnet point block are large to small along a direction away from a central position of the half point block. arrangement. The backlight module of claim 1, wherein the size of the dots substantially falls between 0.1 mm and 1.0 mm or less. The backlight module of claim 1, wherein the dots comprise white ink, yellow ink, blue ink or black ink. The backlight module of claim 1, further comprising a backplane, wherein the light emitting components are disposed on the backplane. The backlight module of claim 9, further comprising a reflective unit disposed on the backplane and located at a periphery of the light-emitting elements, the reflective unit being disposed on a surface of the diffuser a ring-shaped dot block, the ring-shaped dot block having a plurality of dots, each of the ring-shaped dot blocks surrounding each of the light-emitting elements, and each of the ring-shaped dot blocks includes a third sub-dot point Blocks, the network points of the third subnet point block include a plurality of third color diffusion particles. The backlight module of claim 10, wherein the third The color diffusing particles are made of black ink. The backlight module of claim 10, wherein each of the ring-shaped dot blocks further includes a fourth sub-network point block, the fourth sub-network point block surrounding the third sub-network point block, and The plurality of dots of the fourth subnet dot block include a plurality of fourth color diffusing particles. The backlight module of claim 12, wherein the third color diffusing particles are yellow diffusing particles, and the fourth color diffusing particles are blue diffusing particles. The backlight module of claim 12, wherein the density of the plurality of dots located in the third sub-site block is increasing toward the fourth sub-site block and located at the fourth sub-point point The density of the dots at the periphery of the block is gradually decreasing in a direction away from the light-emitting element. The backlight module of claim 12, wherein the sizes of the plurality of dots located in the third sub-site block are arranged from small to large in the direction of the fourth sub-point block, and are located in the The sizes of the dots on the periphery of the fourth sub-dot block are arranged from large to small in a direction away from the light-emitting elements. The backlight module of claim 10, wherein each of the dot blocks located on the diffusion plate has a larger area projected on the reflective unit than each of the annular dot blocks located on the reflective unit. Area.