TWI767549B - Backlight device - Google Patents

Abstract

The invention discloses a backlight device. The backlight device includes a light source base and a light homogenizing member. The light homogenizing member is formed on one side of the light source base. The light homogenizing member includes a main body and a plurality of reflective structures. A plurality of protruding structures are formed on one of the wide side surfaces of the main body. Each reflective structure includes a plurality of filling parts and a connecting part, each filling part fills the gap between two adjacent protruding structures, and the connecting part connects the plurality of filling parts. The thickness of the homogenizing member is less than 1 mm, and the width of each protruding structure is not greater than 100 microns. The thickness of each connection part is not greater than 30 microns. Through the arrangement of the light homogenizing member, the uniformity of light output of the backlight device can be improved.

Description

Backlight device

The present invention relates to a backlight device, in particular to a direct type backlight device with a thickness not greater than 5 millimeters (mm).

With consumer demand, the overall thickness of the existing backlight device has been required to be less than 5 millimeters (mm). When the thickness is not greater than 5 millimeters (mm), the traditional backlight device has the problem of poor light uniformity.

The invention discloses a backlight device, which is mainly used to improve the conventional backlight device. When the overall thickness is required to be no greater than 5 millimeters (mm), the problem of poor uniform light effect is likely to occur.

One embodiment of the present invention discloses a backlight device, which includes: a light source base and a light homogenizing member. The light source base includes a substrate and a plurality of light-emitting diodes, and the plurality of light-emitting diodes are arranged on the substrate at intervals; the width of each light-emitting diode is less than 0.4 millimeters (mm), and the length of each light-emitting diode is less than 0.4 millimeters (mm). The light homogenizing member is arranged above the light source base, the thickness of the light homogenizing member is less than 1 millimeter (mm), and the light homogenizing member includes: a main body and a plurality of reflection structures. One of the wide side surfaces of the body is formed with a plurality of protruding structures, each protruding structure is closely arranged on the wide side, and there is no gap between the two adjacent protruding structures; each protruding structure is a pyramid structure or A hemispherical structure, and the width of each protruding structure is 1/10 times to 1 time of the width or length of the light-emitting diode, and the width of each protruding structure is not greater than 100 micrometers (um). Each reflective structure includes a plurality of filling parts and a connecting part, the plurality of filling parts are connected with the connecting part, and the plurality of filling parts of each reflective structure correspond to fill in the gaps between a part of the plurality of protruding structures; each reflective structure can Reflect the light beams emitted by the light-emitting diodes; the orthographic projection area of each light-emitting diode toward the wide side face is correspondingly located in the orthographic projection area of one of the reflective structures facing the wide side face; The thickness is not more than 30 microns. Wherein, after the light beam emitted by the light source seat enters the light homogenizing member, a part of the light beam will directly pass through the body and be emitted towards the direction of the body opposite to the light source seat, a part of the light beam will be reflected by at least one filling part, and a part of the light beam will be A joint reflection.

To sum up, in the backlight device of the present invention, by forming a plurality of protruding structures on the main body and designing each reflective structure with a filling portion and a connecting portion, the overall thickness of the backlight device can be less than 5 millimeters (mm) Under the circumstance, a relatively good uniform light effect can still be achieved.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and drawings are only used to illustrate the present invention, rather than make any claims to the protection scope of the present invention. limit.

In the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used for emphasis in the subsequent description, and most of the related content mentioned appears in the specific figure, However, it is not limited that only the specific drawings may be referred to in this subsequent description.

Please refer to FIG. 1 to FIG. 4 together. The backlight device 100 of the present invention includes a light source base 1 and a light homogenizing member 2. The light homogenizing member 2 is disposed on one side of the light source base 1, and the light beam emitted by the light source base 1 , will pass through the light homogenizing member 2 and then be emitted outward. It should be noted that, when the backlight device 100 is applied to various display devices, the backlight device 100 may include other various components according to requirements, which is not limited herein.

The light source base 1 includes a substrate 11 , a plurality of light emitting diodes 12 and a package body 13 . The material of the substrate 11 can be selected from, for example, glass, glass fiber board (FR4), BT resin, etc., which is not limited thereto. The plurality of light emitting diodes 12 are provided on the substrate 11 at intervals. In a preferred implementation, each light emitting diode 12 may be a flip chip. In practical applications, each light-emitting diode 12 can be capable of emitting a light beam with a wavelength of 420-480 nm, and the package body 13 can be provided with diffusing particles and color-converting particles according to requirements, which is not limited here. Of course, the package body 13 may not be provided with any particles at all. In an embodiment in which the package body 13 is not provided with any particles at all, the refractive index of the package body 13 may be between 1.4 and 1.6. In the embodiment in which the color conversion particles are arranged in the package body 13 , the light beams emitted by each light-emitting diode 12 with a wavelength of 420-480 nm will be converted into white light after passing through the package body 13 doped with the color conversion particles. shoot. In specific implementation applications, the package body 13 can be made of materials such as silicone resin, epoxy resin, etc.; the color conversion particles include phosphors, semiconductor nanocrystals (II-VI group or III- Group V compounds) and other materials.

As shown in FIG. 2 , in practical applications, the width 12W of each light-emitting diode 12 may be between 0.1 and 0.4 millimeters (mm), and the length 12D of each light-emitting diode 12 may be between 0.1 and 0.4 mm. (mm), the height 12H of each light emitting diode 12 may be between 0.05-0.2 millimeters (mm). Preferably, each light emitting diode 12 may be a sub-millimeter light emitting diode (Mini LED), and the thickness of the package body 13 may range from 0.1 to 0.6 millimeters (mm).

As shown in FIG. 1 to FIG. 4 , the homogenizing member 2 is arranged above the light source base 1, and most of the light beams emitted by the light source base 1 will directly enter the homogenizing member 2, and most of the light beams entering the homogenizing member 2 will be The light homogenizing member 2 projects outward from the side opposite to the light source base 1 . The components used to fix the light homogenizing member 2 above the light source base 1 are not shown in the drawings of this embodiment. Above the light source base 1.

The light homogenizing member 2 includes: a main body 21 and a plurality of reflecting structures 22 . In practical applications, the body 21 can be a transparent structure, and the body 21 is not doped with any diffusing particles, and the body 21 has a good transmittance for the light beam emitted by the light-emitting diode 12, but not limited to this ; In different embodiments, the body 21 may also be doped with diffusion particles. The material of the body 21 can be, for example, polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), etc., which is not limited herein.

One of the wide side surfaces of the main body 21 can be defined as a first wide side surface 211 . The main body 21 is formed with a plurality of protruding structures 213 on the first wide side surface 211 , and each protruding structure 213 is closely arranged on the first wide side surface 211 . , and the two protruding structures 213 adjacent to each other have no gap on the first wide side surface 211 . The plurality of protruding structures 213 are integrally formed with the main body 21 , and the plurality of protruding structures 213 may be formed on the first wide side 211 of the main body 21 by rolling or other methods during the manufacturing process of the main body 21 . The width 213D of each protruding structure 213 is 1/10 times to 1 times the width 12W (as shown in FIG. 2 ) or the length 12D (as shown in FIG. 2 ) of the light emitting diode 12 , and the width of each protruding structure 213 is The width 213D is not greater than 50 micrometers (um).

In practical applications, each protruding structure 213 is a pyramid structure or a hemispherical structure. For example, as shown in FIG. 3 , each protruding structure 213 is, for example, a triangular pyramid structure, and in the top view of the side of the main body 21 where a plurality of protruding structures 213 are formed, any one of the various triangular pyramid structures can be seen The bottom edge is connected to the bottom edge of another triangular pyramid structure, and each protruding structure 213 is closely arranged on the wide side of the body 21; wherein, the width 213D of each protruding structure 213 of the triangular pyramid structure is the light emitting diode The width 12W (as shown in FIG. 2 ) or the length 12D (as shown in FIG. 2 ) of 12 is 1/10 times to 1 times, and the width 213D of each protruding structure 213 is not greater than 50 micrometers (um). In the embodiment in which each protruding structure 213 is a pyramid structure, each protruding structure 213 includes a bottom surface and a plurality of inclined surfaces. Preferably, the included angle between the bottom surface of each protruding structure 213 and any inclined surface is between 45-75 Spend. In the embodiment in which each protruding structure 213 is a hemispherical structure, each protruding structure 213 can be a hemispherical structure or a semielliptical spherical structure, etc., which is not limited herein.

As shown in FIG. 5 , in different embodiments, each protruding structure 213 may also be a quadrangular pyramid structure; wherein, the width 213D of each protruding structure 213 is the width 12W of the light emitting diode 12 (as shown in FIG. 2 ) ) or 1/10 times to 1 times the length 12D (as shown in FIG. 2 ), and the width 213D of each protruding structure 213 is not greater than 50 micrometers (um). As shown in FIG. 6 , in another embodiment, each protruding structure 213 may also be a hexagonal pyramid structure; wherein, the width 213D of each protruding structure 213 is the width 12W of the light emitting diode 12 (as shown in FIG. 2 ) ) or 1/10 times to 1 times the length 12D (as shown in FIG. 2 ), and the width 213D of each protruding structure 213 is not greater than 100 micrometers (um). The height 213H of each protruding structure 213 relative to the first wide side 211 may be between 10 micrometers (um) and 50 micrometers (um); the width 213D of each protruding structure 213 may be between 10 micrometers (um) to 100 micrometers (um).

As shown in FIG. 1 , FIG. 3 and FIG. 4 , each reflection structure 22 can reflect the light beams emitted by the light emitting diodes 12 . Each reflective structure 22 includes a plurality of filling parts 221 and a connecting part 222 , the filling parts 221 are connected with the connecting part 222 , and the filling parts 221 of each reflective structure 22 correspond to a part of the protruding structures 213 . Gap between. Specifically, each reflective structure 22 can be formed by curing reflective ink, and the reflective ink can be formed on the side of the body 21 having the plurality of protruding structures 213 by means of inkjet, screen printing, or the like. Of course, each reflective structure 22 can be any structure that can be used to reflect the light beam emitted by the light emitting diode 12, and is not limited to white reflective ink. As shown in FIG. 1 , in a preferred embodiment, the thickness 222H of each connecting portion 222 may be between 1 micrometer (um) and 30 micrometers (um).

As shown in FIG. 3 and FIG. 4 , in practical application, when viewing the top view of the light-homing member 2 from the side of the light-homing member 2 opposite to the light source base 1 , the shape of each reflective structure 22 can be changed according to the requirements, as long as Each light-emitting diode 12 forms an orthographic projection area 12A in the direction of the orthographic projection of the first wide side of the plurality of protruding structures 213 toward the body 21 , and is located in the direction of the corresponding reflection structure 22 toward the first wide side of the body 21 . The projected orthographic projection area 22A is sufficient. Preferably, each light-emitting diode 12 may have at least 6 protruding structures 213 in the orthographic projection area in the direction of the orthographic projection of the first wide side surfaces of the plurality of protruding structures 213 formed toward the body 21 .

As shown in FIG. 1 , in a preferred embodiment, if the horizontal distance between the central axes CP of two adjacent light-emitting diodes 12 is defined as a separation distance P, the width 222D of each connecting portion 222 is The width 222D of each connecting portion 222 is not less than one-eighth of the separation distance P, and the width 222D of each connection portion 222 is not greater than one-half of the separation distance P, so that a relatively good light homogenization effect can be obtained. Preferably, the separation distance P may be between 2 and 6 millimeters (mm). In a preferred application, the thickness 2H of the light homogenizing member 2 is not greater than 1 mm, that is, the thickness 21H of the body 21 , the height 213H of each protruding structure 213 relative to the first wide side 211 and the height 213H of each reflective structure 22 The thickness 222H of the connecting portion 222 is not greater than 1 millimeter (mm).

It is worth mentioning that, in FIG. 3 , a single reflective structure 22 is used to shield 6 protruding structures 213 that are triangular pyramid structures, but the number of protruding structures 213 corresponding to a single reflective structure 22 is not the same. As a limitation, in practical applications, it may be modified according to the size of each light-emitting diode and the size of each protruding structure 213 . Similarly, in FIG. 5 , four protruding structures 213 having a quadrangular pyramid structure are correspondingly shielded by a single reflective structure 22 , but the protruding structures 213 shielded by a single reflective structure 22 are not limited thereto. In FIG. 6 , a single reflective structure 22 shields four protruding structures 213 having a hexagonal pyramid structure correspondingly, but the protruding structures 213 shielded by a single reflective structure 22 are not limited to this.

According to the above, after the light beam emitted by the light source base 1 enters the light homogenizing member 2, a part of the light beam will directly pass through the main body 21 and exit toward the main body 21 in a direction opposite to the light source base 1, and a part of the light beam will be filled by at least one filling part. 221, a part of the light beam will be reflected by at least one connecting part 222, and after the light beam of the light source base 1 passes through the light homogenizing member 2, a relatively good light homogenization effect can be exhibited. Specifically, when the backlight device 100 is not provided with the plurality of protruding structures 213 and the plurality of reflective structures 22, the difference between the brightness at the brightest position and the brightness at the darkest position of the backlight device 100 is about 20%; In the case where the body 21 is provided with a plurality of protruding structures 213, but is not provided with a plurality of reflective structures 22, the difference between the brightness at the brightest position and the brightness at the darkest position of the backlight device 100 will be reduced to less than 15%; When the body 21 is provided with a plurality of protruding structures 213 and reflective structures 22 at the same time, the difference between the brightness at the brightest position and the brightness at the darkest position of the backlight device 100 will be reduced to less than 5%.

Please refer to FIG. 7 , which is a schematic cross-sectional view of a second embodiment of the backlight device of the present invention. The biggest difference between this embodiment and the previous embodiment is that the other wide side surface of the main body 21 opposite to the first wide side surface 211 is defined as a second wide side surface 212 , and a plurality of auxiliary protrusions are formed on the second wide side surface 212 of the main body 21 . Each of the auxiliary protruding structures 214 is closely arranged and formed on the second wide side surface 212 , and there is no gap between the two auxiliary protruding structures 214 adjacent to each other. In practical applications, the shape and size of each auxiliary protruding structure 214 may be exactly the same as the shape and size of each protruding structure 213 , but not limited thereto. When the light homogenizing member 2 is disposed on one side of the light source base 1, the second wide side surface 212 is disposed facing the light source base 1, and the plurality of auxiliary protruding structures 214 are disposed facing the light source base 1. Each protruding structure 213 and The reflection structure 22 is located on the side of the main body 21 opposite to the light source base 1 .

In a preferred application, the thickness 2H of the light homogenizing member 2 is not greater than 1 mm, that is, the thickness 21H of the main body 21 , the height 214H of each auxiliary protruding structure 214 relative to the second wide side 212 , and the height 214H of each protruding structure The height 213H of 213 relative to the first wide side surface 211 and the thickness 222H of the connecting portion 222 of each reflective structure 22 are not greater than 1 millimeter (mm); each auxiliary protruding structure 214 can be a pyramid structure or a hemispherical structure, and each The width 214D of the auxiliary protruding structure 214 is 1/10 times to 1 times the width 12W (as shown in FIG. 2 ) or the length 12D (as shown in FIG. 2 ) of the light emitting diode 12 , and each auxiliary protruding structure 214 The width 214D is not greater than 100 micrometers (um).

Through the arrangement of the plurality of auxiliary protruding structures 214 , the uniformity of the light output of the backlight device 100 can be further improved. Specifically, the brightness of the brightest position and the brightness of the darkest position of the backlight device 100 of the foregoing embodiments are both improved. The difference is less than 5%, and the difference between the brightness at the brightest position and the brightness at the darkest position of the backlight device 100 of this embodiment will be reduced to less than 3%.

Please refer to FIG. 8 , which is a schematic cross-sectional view of a third embodiment of the backlight device of the present invention. The biggest difference between this embodiment and the embodiment shown in FIG. 7 is that the first wide side surface 211 of the main body 21 is disposed facing the light source base 1 , and each reflection structure 22 is disposed facing the light source base 1 .

Please refer to FIG. 9 and FIG. 10 together. FIG. 9 is a schematic cross-sectional view of a fourth embodiment of the backlight device of the present invention, and FIG. 10 is a partially enlarged schematic view of the light source seat of the embodiment shown in FIG. 9 . One difference between this embodiment and the embodiment shown in FIG. 1 is that the backlight device 100 further includes a blue light transmissive film 3 , a color conversion film 4 and a Prism Sheet 5 . The light homogenizing member 2 is arranged between the blue light penetrating film 3 and the light source base 1, the blue light penetrating film 3 is arranged between the color conversion film 4 and the light homogenizing member 2, and the color conversion film 4 is arranged between the blue light penetrating film 3 and the edge. between lenses 5. To put it simply, the light source base 1 is sequentially provided with a light homogenizing member 2, a blue light penetrating film 3, a color conversion film 4, and a crystal film 5, and the light source base 1 emits a light beam with a wavelength of 420-480 nm. After passing through the light homogenizing member 2 , the blue light penetrating film 3 and the color conversion film 4 in sequence, it will be converted into white light. It should be noted that, the interior of the package body 13 of the light source base 1 in this embodiment is not doped with any color conversion particles. The color conversion film 4 includes, for example, phosphor, semiconductor nanocrystal (II-VI group or III-V group compound) materials.

In practical applications, the transmittance of the blue light penetrating film 3 to the light beam with a wavelength of 420-480 nm is greater than 90%, and the transmittance of the blue light penetrating film 3 to the light beam with a wavelength of 550-750 nm not more than 2%. In the drawings of this embodiment, the structure for fixing the light source base 1 , the light homogenizing member 2 , the blue light penetrating film 3 , the color conversion film 4 and the iris sheet 5 to each other is not shown. In practical applications, It can be designed according to requirements, and is not limited here.

According to the above, in the backlight device 100 of the present embodiment, through the design of the light homogenizing member 2 , the blue light penetrating film 3 and the color conversion film 4 , etc., the backlight device 100 can have an overall thickness of not more than 5 millimeters (mm). , the difference between the brightness of the brightest position and the brightness of the darkest position of the backlight device 100 may be less than 10%; on the contrary, the conventional backlight device with similar components has an overall thickness of no more than 5 millimeters (mm) In this case, the difference between the brightness of the brightest position and the brightness of the darkest position of the backlight device 100 cannot be less than 10% (generally greater than 20%).

As shown in FIG. 10 , one of the differences between this embodiment and the previous embodiment is that each light-emitting diode 12 is opposite to a top surface 121 of the substrate 11 and is provided with a light-shielding member 122 , and the light-shielding member 122 is opposite to the light-emitting diode. The reflectivity of the light beam emitted by the body 12 is between 95% and 98%. Through the design of the light shielding member 122 , the light intensity of the forward light of each light emitting diode 12 can be reduced, so that the overall light homogenization effect of the light source base 1 can be further improved. In a preferred embodiment, the light-shielding member 122 may be, for example, a distributed Bragg reflector, and the light-shielding member 122 may be formed on the sapphire substrate of the light-emitting diode 12 opposite to the PN of the light-emitting diode 12 The light-shielding member 122 is formed by stacking multiple layers of metal and metal oxide (eg TiO ₂ , SiO ₂ ) structures, so that the relevant personnel can precisely control the structure of each layer included in the light-shielding member 122 Refractive index, the refraction path of the light beam emitted by the light emitting diode 12 through the light shielding member 122 can be precisely controlled.

It should be noted that there are three differences between this embodiment and the previous embodiments: the main body 21 includes a plurality of protruding structures 213 , each light emitting diode 12 has a light shielding member 122 , and the backlight device 100 includes a blue light penetrating film 3 , The color conversion film 4 and the crystal film 5; in different embodiments, the relevant technical personnel can select at least one of the three different features to be combined in the aforementioned first embodiment according to the needs, and the three different technical features are not Confinement must exist simultaneously.

To sum up, in the backlight device of the present invention, a plurality of grooves are formed on the outer side of the main body, and a part of the plurality of reflective structures is filled in the plurality of grooves, and the inner side of the main body forms a plurality of protruding structures. , Make each light-emitting diode have a light-shielding member, and make one side of the light-homing member of the backlight device are sequentially provided with a blue light penetrating film 3, a color conversion film 4, and a fluorine film 5, etc., so that the backlight device can be used in the overall thickness of the design. In the case of less than 5 millimeters (mm), relatively good uniformity can still be achieved (the difference between the brightness of the brightest position and the brightness of the darkest position of the backlight device 100 can be less than 10%).

The above descriptions are only preferred feasible embodiments of the present invention, which do not limit the scope of the present invention. Therefore, any equivalent technical changes made by using the contents of the description and drawings of the present invention are included in the protection scope of the present invention. .

100: Backlight device 1: Light source seat 11: Substrate 12: Light Emitting Diodes 121: top surface 122: Shading member 12W: width 12D: Length 12H: height 12A: Orthographic projection area 13: Package body 2: Homogenizing component 2H: Thickness 21: Ontology 21H: Thickness 211: First wide side 212: Second wide side 213: Protruding structure 213D:Width 213H: height 214: Auxiliary protruding structure 214D:Width 214H: height 22: Reflective Structure 22A: Orthographic projection area 221: Filler 222: Connector 222D:Width 222H: Thickness 3: blue light penetrating film 4: color conversion film 5: Pills P: separation distance G: Gap CP: Center axis

FIG. 1 is a partial cross-sectional schematic diagram of a first embodiment of a backlight device of the present invention.

FIG. 2 is a partial enlarged schematic view of a light source seat of the first embodiment of the backlight device of the present invention.

FIG. 3 is a schematic top view of the body of the backlight device according to the first embodiment of the present invention formed with a plurality of protruding structures.

FIG. 4 is a partial top schematic view of the body of the backlight device according to the first embodiment of the present invention formed with a plurality of protruding structures.

FIG. 5 is a schematic top view of a body of a backlight device according to an embodiment of the present invention formed with a plurality of protruding structures.

FIG. 6 is a schematic top view of a body of a backlight device according to an embodiment of the present invention formed with a plurality of protruding structures.

FIG. 7 is a partial cross-sectional schematic diagram of a second embodiment of the backlight device of the present invention.

8 is a partial cross-sectional schematic diagram of a third embodiment of the backlight device of the present invention.

9 is a partial cross-sectional schematic diagram of a fourth embodiment of the backlight device of the present invention.

FIG. 10 is a partial enlarged schematic view of a light source seat of a fourth embodiment of the backlight device of the present invention.

100: Backlight device

1: Light source seat

11: Substrate

12: Light Emitting Diodes

12D: Length

13: Package body

2: Homogenizing component

2H: Thickness

21: Ontology

21H: Thickness

211: First wide side

212: Second wide side

213: Protruding structure

213D:Width

213H: height

22: Reflective Structure

221: Filler

222: Connector

222D:Width

222H: Thickness

P: separation distance

G: Gap

CP: Center axis

Claims (10)

A backlight device, comprising: a light source base, which includes a substrate and a plurality of light-emitting diodes, the plurality of light-emitting diodes are arranged on the substrate at intervals; the width of each of the light-emitting diodes is less than 0.4 millimeters (mm), the length of each of the light-emitting diodes is less than 0.4 millimeters (mm); a homogenizing member, which is arranged above the light source base, and the thickness of the homogenizing member is less than 1 mm (mm), the light homogenizing member comprises: a main body, one of the wide side surfaces of the main body is formed with a plurality of protruding structures, and each of the protruding structures is closely arranged and formed on the wide side surface, and is adjacent to each other There is no gap between the two protruding structures of /10 times to 1 times, and the width of each of the protruding structures is not greater than 100 micrometers (um); a plurality of reflective structures, each of the reflective structures includes a plurality of filling parts and a connecting part, and a plurality of the filling parts Connected with the connecting part, the filling parts of each of the reflective structures correspondingly fill in the gaps between a plurality of the protruding structures; each of the reflective structures can reflect the light-emitting diodes the emitted light beam; the orthographic projection area of each of the light-emitting diodes in the direction of the orthographic projection toward the wide side face corresponds to the orthographic projection area of one of the reflection structures in the direction of the orthographic projection of the wide side face; each The thickness of the connecting portion is not more than 30 microns; wherein, after the light beam emitted by the light source seat enters the light homogenizing member, a part of the light beam will directly pass through the body and face the body opposite to the light source seat. , a part of the beam will be emitted by at least A portion of the light beam will be reflected by at least one of the connecting portions, reflecting one of the filling portions. The backlight device according to claim 1, wherein the thickness of each of the connecting parts is between 1 micrometer (um) and 30 micrometers (um); and the height of each of the protruding structures relative to the wide side is between between 10 micrometers (um) and 50 micrometers (um); the width of each of the protruding structures is between 10 micrometers (um) and 100 micrometers (um). The backlight device according to claim 1, wherein the horizontal distance between the central axes of two adjacent light-emitting diodes is defined as a separation distance, and the width of each of the connecting portions is not less than the separation distance 1/8 of the distance, and the width of each of the connecting parts is not greater than 1/2 of the separation distance. The backlight device according to claim 1, wherein each of the protruding structures is a pyramid structure; each of the protruding structures includes a bottom surface and a plurality of inclined surfaces, and the included angle between the bottom surface and any one of the inclined surfaces is between 45° ~75 degrees. The backlight device of claim 1, wherein the broad side of the body formed with a plurality of the protruding structures is defined as a first broad side, and the other broad side of the body is defined as a second broad side wide side, the body is formed with a plurality of auxiliary protruding structures on the second wide side, each of the auxiliary protruding structures is closely arranged and formed on the second wide side, and the two adjacent to each other There is no gap between the auxiliary protruding structures; the thickness of the light homogenizing member is not more than 1 millimeter (mm); each of the auxiliary protruding structures is a pyramid structure or a hemispherical structure, and the thickness of each auxiliary protruding structure is The width is 1/10 times to 1 times the width or length of the light emitting diode, and the width of each of the auxiliary protruding structures is not greater than 100 micrometers (um). The backlight device of claim 5, wherein the first wide side faces the light source base. The backlight device of claim 5, wherein the second wide side faces the light source base. The backlight device of claim 1, wherein each of the light-emitting diodes can emit light beams with wavelengths ranging from 420 to 480 nanometers; and the width of each of the light-emitting diodes is from 0.1 to 0.4 millimeters (mm) , the length of each of the light-emitting diodes is between 0.1 and 0.4 millimeters (mm), and the height of each of the light-emitting diodes is between 0.05 and 0.2 millimeters (mm); two adjacent light-emitting diodes The horizontal distance between the central axes of the polar bodies is defined as a separation distance, and the separation distance is between 2 and 6 millimeters (mm); the light source base further includes a package body, and the package body is disposed on the substrate , and cover all the light emitting diodes, the refractive index of the package body is between 1.4 and 1.6, and the thickness of the package body is between 0.1 and 0.6 millimeters (mm). The backlight device according to claim 8, wherein each of the light-emitting diodes is opposite to a top surface of the substrate and is provided with a light-shielding member, and the light-shielding member has a negative effect on the light beams emitted by the light-emitting diodes. The reflectivity is not less than 95%. The backlight device according to claim 8, wherein the backlight device further comprises a blue light penetrating film, a color conversion film, and a fluorine film, and the light homogenizing member is disposed on the blue light penetrating film and the light source base between, the blue light penetrating film is arranged between the color conversion film and the light homogenizing member, and the color conversion film is arranged between the blue light penetrating film and the crystal plate; the blue light penetrating film The transmittance of the transparent film to light beams with wavelengths ranging from 420 to 480 nanometers is greater than 90%, and the transmittance of the blue light penetrating film to light beams with wavelengths ranging from 550 to 750 nanometers is not greater than 2%; The light beam emitted by the light source seat will be converted into white light after passing through the light homogenizing member, the blue light penetrating film and the color conversion film in sequence.

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