TWM580691U - A direct type backlight device - Google Patents

Abstract

A direct type backlight device includes: a light source holder and a diffusion sheet body. The diffusion sheet is disposed on one side of the light source holder. The light source holder comprises: a circuit board, the circuit board is provided with a plurality of reflective cup structures and a plurality of light emitting units. Each of the reflector cup structures has a reflective cavity, and each of the light emitting units is disposed in the reflective cavity. A part of the light beam emitted by each of the light-emitting units will be directly emitted through the diffusion sheet, and a part of the light beam emitted from the light-emitting unit can be reflected by the reflective cavity and then emitted toward the diffusion sheet. The diffuser body can reflect a part of the light beam from the light source holder toward the light source holder. The direct type backlight device of the present invention has better light uniformity than the conventional direct type backlight module.

Description

Direct type backlight

The present invention relates to a backlight device, and more particularly to a direct type backlight device.

The light source module of the existing large display device (for example, a television, etc.) can be roughly divided into an edge light type and a direct type, and the direct type backlight module has better color performance than the edge light type backlight module, and therefore, the direct type The backlight module is one of the major technologies developed by related manufacturers in recent years. However, the existing direct type backlight module is prone to the inconsistency of brightness in each area, and the problem of dark areas and bright areas is generated, which is commonly known as the Mura phenomenon.

The main purpose of the present invention is to provide a direct type backlight device for improving the problem that the direct type backlight device is prone to dark areas and bright areas in the prior art.

In order to achieve the above object, the present invention provides a direct type backlight device comprising: a light source holder and a diffusion sheet body. The light source holder comprises: a circuit board, a plurality of reflective cup structures and a plurality of light emitting units. The plurality of reflector cup structures are fixedly disposed on one side of the circuit board, and each of the reflector cup structures is concavely formed with a reflection cavity from a side away from the circuit board toward a side close to the circuit board. Each of the light-emitting units is fixedly disposed on the circuit board, and the plurality of light-emitting units are correspondingly located in the plurality of reflective cavities, each of the light-emitting units includes a light-emitting diode, a light-shielding member and a light-transmitting body, and the light-emitting diode has five light-emitting surfaces. The semi-shield member is disposed on the opposite end of the light-emitting diode opposite to the circuit board, and a part of the light beam emitted from the end surface can be outwardly emitted through the semi-shield member, and the semi-shield member can block the outward exit through the end surface. The partial light beam; the light-transmitting body is covered with the semi-shield member and the light-emitting diode, and the light beam emitted by each of the light-emitting diodes can be emitted outward through the corresponding light-transmitting body. The diffusion sheet is disposed above the light source holder, and the diffusion sheets are opposite to each other The two sides are defined as an inner side surface and an outer side surface. The inner side surface faces the light source holder, and the diffusion sheet body has a plurality of reflective regions corresponding to the plurality of reflective cavities, and each of the reflective regions is formed with a plurality of reflective bumps and a plurality of reflective convex portions. The dot is formed on at least one of the inner side surface and the outer side surface, and the plurality of reflective bumps in each of the reflective regions are radially arranged, and the plurality of reflective bumps in each of the reflective regions are closer to the position of the light emitting unit. The more closely arranged, the more the plurality of reflective bumps in each reflective region are arranged more sparsely away from the position of the light emitting unit; the plurality of reflective bumps can reflect a part of the light beam emitted from the light emitting unit toward the light source holder. And the diffusion sheet can pass a part of the light beam emitted from the light source holder. The side walls forming the respective reflecting cavities are a reflecting surface, and the reflecting surfaces of the respective reflecting cavities can reflect a part of the light beams emitted by the corresponding light emitting units, so that the light beams are emitted toward the diffusion sheet body.

The beneficial effect of the present invention may be that the direct-type backlight device of the present invention has better light-emitting uniformity than the existing direct-type backlight module, that is, the direct-type backlight device of the present invention can greatly improve the existing direct-type backlight module. The problem of obvious dark areas and bright areas that are easy to exist.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only for reference and description, and are not intended to limit the creation.

D‧‧‧Direct type backlight

1‧‧‧Light source holder

11‧‧‧ boards

12‧‧‧Reflection cup structure

12A‧‧‧Reflection chamber

12B‧‧‧ accommodating holes

121‧‧‧reflecting surface

121A‧‧‧ arc segment

13‧‧‧Lighting unit

131‧‧‧ top surface

132‧‧‧ ring light surface

14‧‧‧Lighting diode

141, 142, 143, 144, 145‧‧ ‧ luminous surface

15‧‧‧Hammer

16‧‧‧Transparent body

2‧‧‧reflecting sheet

21‧‧‧ body

22‧‧‧Reflection unit

23‧‧‧Orthogonal pyramid structure

231‧‧‧ bottom

2311‧‧‧Bottom

232‧‧‧ side

233‧‧‧ vertex

3‧‧‧Diffuse sheet

31‧‧‧Ontology

311‧‧‧ inside

312‧‧‧ outside side

32‧‧‧Reflection bumps

4‧‧‧ Picture

5‧‧‧Reflective brightness enhancement film

6‧‧‧Blue light transmissive film

7‧‧‧Quantum dot film

A‧‧‧reflection area

CP‧‧‧ center point

S1‧‧‧ gap

S11‧‧‧ distance

S3‧‧‧ gap

S31‧‧‧Distance

S4‧‧‧ gap

S41‧‧‧ distance

L‧‧‧ length

W1‧‧‧Width

W2‧‧‧Width

W3‧‧‧ length

H1‧‧‧ Height

H2‧‧‧ Height

H3‧‧‧ Height

H4‧‧‧ Height

C1‧‧‧beam path

C2‧‧‧ beam path

C3‧‧‧ beam path

C4‧‧‧beam path

OD‧‧‧OD

P1‧‧‧ spacing

P2‧‧‧ spacing

P3‧‧‧ spacing

Θ1‧‧‧ angle

Θ2‧‧‧ angle

R‧‧‧ normal

1 is a partial cross-sectional view showing a direct type backlight device of a first embodiment of the present invention.

2 is a top view of the light source holder of the direct type backlight device of the present invention.

Fig. 3 is a partially enlarged schematic view of Fig. 2;

4 is a top view of the diffusion sheet of the direct type backlight device of the present invention.

Fig. 5 is a partially enlarged schematic view of Fig. 4;

Fig. 6 is a partially enlarged schematic view of Fig. 1.

FIG. 7 is a schematic diagram of a light emitting unit of the direct type backlight device of the present invention.

Fig. 8 is a side view of the light emitting unit of the direct type backlight device of the present invention.

FIG. 9 is a partially enlarged schematic view showing another embodiment of the direct type backlight device of the present invention.

Figure 10 is a top plan view of the reflective sheet of the direct type backlight device of the present invention.

Figure 11 is a partially enlarged schematic view of Figure 10.

12 is a schematic view of a reflection unit of the direct type backlight device of the present invention.

Figure 13 is a side view of the reflecting unit of the direct type backlight device of the present invention.

FIG. 14 is a partial cross-sectional view showing another embodiment of the direct type backlight device of the present invention.

Figure 15 is a partially enlarged schematic view of Figure 14.

In the following description, if reference is made to a specific drawing or as shown in the specific drawings, it is only used to emphasize that in the following description, the relevant content of the description is mostly in the specific drawing. However, it is not limited to the specific description in the following description.

Please refer to FIG. 1, which is a cross-sectional view showing a first embodiment of the direct type backlight device of the present invention. The direct type backlight device D of the present invention comprises: a light source holder 1 and a diffusion sheet body 3. It should be noted that the direct difference backlight device D of the present invention is mainly different from the conventional direct type backlight module in the light source holder 1 and the diffusion sheet body 3. In the following description, the light source holder 1 and the diffusion sheet body 3 will be mainly described in detail, but it does not mean that the direct type backlight unit D of the present invention has only the light source holder 1 and the diffusion sheet body 3. The direct type backlight device D of the present invention is still The necessary components provided by the conventional direct type backlight module can be provided according to requirements.

As shown in FIG. 1, the diffusion sheet body 3 is provided above the light source holder 1 of the direct type backlight unit D of the present invention. The light source base 1 has a circuit board 11, a plurality of reflective cup structures 12 and a plurality of light emitting units 13. The plurality of reflective cup structures 12 are disposed adjacent to each other on one side of the circuit board 11, and the plurality of light emitting units 13 are fixedly disposed on the circuit board. 11, and a plurality of light emitting units 13 are correspondingly located in the plurality of reflective cup structures 12.

A gap S1 is formed between the diffusion sheet 3 and the light source holder 1, and the gap S1 The air (ie, the air layer) may be filled, and the diffusion sheet 3 may be fixedly disposed above the light source holder 1 by a structure such as a frame of the direct type backlight device D.

As shown in FIG. 1 , FIG. 7 and FIG. 8 , as shown in FIG. 1 , the length L of each of the light-emitting units 13 may be between 0.1 mm (mm) and 2 mm, and the width W1 of the light-emitting unit 13 may be The height H1 of the light-emitting unit 13 may be between 0.1 mm and 1.7 mm, and the distance S11 of the gap S1 formed between the diffusion sheet body 3 and the light source holder 1 may be less than or Equal to 2 mm. Through the design of the above air layer, the uniformity of light emission of the direct type backlight device D can be further increased.

Please refer to FIG. 1 to FIG. 3 together. FIG. 2 shows a top view of the light source holder, and FIG. 3 is a partial enlarged view of FIG. The plurality of reflector cup structures 12 may be closely arranged on the circuit board 11 , that is, the adjacent two reflector cup structures 12 may be disposed without a spacing, but not limited thereto, in a special application. The two reflecting cup structures 12 adjacent to each other may also have a minute pitch which is appropriately designed (without affecting the uniformity of light emitted from the direct type backlight unit D as a whole). As shown in FIG. 2 and FIG. 3, each of the reflector cup structures 12 can be substantially square-shaped in the upper view thereof, but not limited thereto, the appearance of each of the reflector cup structures 12 in the upper view thereof may be Depending on the demand, for example, it may be rectangular, circular, elliptical or the like.

One side of each of the reflector cup structures 12 is fixedly disposed on the circuit board 11, and each of the reflector cup structures 12 is recessed from a side away from the circuit board 11 toward a side close to the circuit board 11 to form a reflection cavity 12A. Each of the reflector cups 12 is fixed to the bottom of the circuit board 11 and has a receiving hole 12B. The receiving hole 12B is located at the bottom of the reflective cavity 12A, and the light emitting unit 13 disposed on the circuit board 11 is correspondingly disposed through the receiving hole 12B. Settings.

The side walls forming the respective reflecting cavities 12A are a reflecting surface 121, and the reflecting surface 121 of each reflecting cavity 12A can reflect a part of the light beams emitted by the corresponding light emitting unit 13 so that the light beams are emitted toward the diffusing film body 3. In practical applications, the height H1 of the light-emitting unit 13 (as indicated in FIG. 11) is not higher than the height H2 of the reflective cavity 12A, and the reflective surface 121 is disposed around the light-emitting unit 13.

In practical applications, each reflective cavity 12A has a position adjacent to the circuit board 11 The curvature (Rho) of the arcuate section 121A, the arcuate section 121A is 0.6 to 0.95, whereby the reflecting cavity 12A can more effectively reflect the light beam emitted from the light emitting unit 13 in the direction of the diffusion sheet 3. It should be noted that, as shown in FIG. 1 , the ratio of the width W2 to the height H2 of each reflector cup structure 12 may be between 2:1 and 6:1, but not limited thereto, and the size of the reflective cavity 12A and The appearance may be correspondingly changed depending on the light emitting unit 13. The shape of the reflective cavity 12A may be changed according to requirements. In different embodiments, the reflective cavity 12A may not have the arc-shaped segment 121A, and the reflective cavity 12A may be a rectangular cube-shaped, inverted ladder. Shape and so on.

In a particular application, the reflectivity of the reflective surface 121 of the reflector cup structure 12 is preferably greater than 90%. The reflector cup structure 12 may be made of a high reflectivity material, for example, a resin containing a highly reflective material composed of metal oxide particles such as titanium oxide, aluminum oxide, or cerium oxide, but not In different applications, the reflector cup structure 12 may be made of a material having a low reflectivity, and then disposed on a wall surface forming the reflection cavity 12A (for example, in a coating manner) having a high reflectivity layered structure. On the other hand, one side of the layered structure having high reflectance can be formed as the aforementioned reflecting surface 121.

4 to FIG. 6, FIG. 4 is a top view of the diffusion sheet, FIG. 5 is a partial enlarged view of FIG. 4, and FIG. 6 is a partially enlarged view of FIG. The diffusion sheet 3 includes a body 31 and a plurality of reflective bumps 32. The body 31 may have diffusing particles therein, so that the light beam can be refracted and reflected in a specific direction therein, so that the passing light beam can be emitted more uniformly outward. Specifically, the body 31 can be a diffusion film ( Diffuser Film).

The two sides opposite to each other of the body 31 are defined as an inner side surface 311 and an outer side surface 312. The inner side surface 311 of the body 31 is disposed facing the light source holder 1, and the inner side surface 311 of the body 31 is formed with a plurality of reflective bumps 32. The plurality of reflective bumps 32 may be formed on the body 31 by rolling, spraying, printing, or the like. Each of the reflective bumps 32 is spherical, and in practical applications, each of the reflective bumps 32 may be in the form of a semi-spherical shape. The outer diameter OD of each of the reflective bumps 32 may be between 30 micrometers (μm) and 500 micrometers; The height H4 of the reflective bumps 32 can be less than 10 microns.

As shown in FIGS. 4 and 5, the diffusion sheet 3 may have a plurality of reflection areas A, and the plurality of reflection areas A correspond to the plurality of reflection cavities 12A. Each of the reflective regions A has a plurality of reflective bumps 32. In other words, the diffusion sheet 3 can be divided into a plurality of reflection areas A according to the distribution of the plurality of reflection bumps 32, and the body 31 is not provided with the position of the reflection bumps 32, and is not the reflection area A.

Each of the reflective areas A has a center point CP, and the center point CP is located directly above the light-emitting unit 13. The plurality of reflective bumps 32 in each of the reflective areas A may be radially arranged, and the plurality of reflective areas are arranged. The closer the reflection bumps 32 are to the position closer to the center point CP, the more closely the positions of the plurality of reflection bumps 32 in each of the reflection regions A are arranged more sparsely from the position of the center point CP, that is, FIG. 5 The pitch P1 shown is greater than the pitch P2.

In the drawing of the present embodiment, the plurality of reflective bumps 32 of the respective reflective regions A are arranged in a plurality of circular annular structures centering on the center point CP, and the plurality of circular annular structures are spaced apart from each other. The arrangement of the reflective bumps 32 is not limited thereto. For example, the plurality of reflective bumps 32 in each of the reflective regions A may also be arranged in a plurality of rectangular annular structures or a plurality of reflective bumps 32. It can also be arranged in a linear radial shape.

As shown in FIG. 6 , in this embodiment, a plurality of reflective bumps 32 are formed on the inner side surface 311 of the body 31 . However, in different applications, the reflective bumps 32 may also be formed on the outer side surface 312 of the body 31 . . In a particular application, a portion of the reflective bumps 32 in the same reflective area A may be formed on the inner side 311, and another portion of the reflective bumps 32 may be formed on the outer side 312, for example, The partial reflection bumps 32 adjacent to the light-emitting unit 13 may be located on the inner side surface 311 of the body 31, and the reflective bumps 32 away from the light-emitting unit 13 may be located on the outer side surface 312 of the body 31.

As shown in FIG. 1 , through the arrangement of the plurality of reflective bumps 32 , the diffusion sheet 3 can reflect a part of the light beam from the light source holder 1 back to the light source holder 1 , and one from the light source holder 1 . A part of the light beam can enter the body 31 (for example, the light beam enters the body 31 from the position where the body 31 is not formed with the reflection bump 32), and is reflected and refracted in the body 31, and the diffuser body 3 is opposite to the light source seat. One side of 1 is shot outward.

As shown in FIG. 6, it is worth mentioning that, in the drawing of the embodiment, a plurality of reflective bumps 32 are formed on the body 31 at intervals from each other, and two reflective bumps 32 adjacent to each other are adjacent to each other. The spacing P3 between, for example, may be between 10 micrometers and 1000 micrometers, but not limited thereto. In different applications, the reflective bumps 32 may also be disposed with little space between each other.

Referring to Figures 1 and 6, the dotted line shown in the figure indicates the beam path (optical path) emitted by each of the light-emitting units 13. As shown in the figure, most of the light beam emitted by the light-emitting unit 13 will be reflected by the reflecting surface 121 of the reflecting cavity 12A, and then guided to the direction of the reflecting sheet 2 (the beam path C3 shown in FIG. 1). ).

The light beam reflected by the reflecting surface 121 enters the reflecting bump 32 in a direction perpendicular to the inner side surface 311 of the body 31, and the light beam can directly pass through the diffusing sheet 3, and the diffusion sheet 3 is opposite to the light source holder 1 The side is emitted outward (the beam path C2 shown in Fig. 1). If the light beam reflected by the reflecting surface 121 enters the reflecting bump 32 in the direction of the vertical inner side surface 311, it will be reflected by the reflecting bump 32 and return to the original or another reflecting chamber 12A (as shown in FIG. 1). The beam path C1) is again reflected by the reflecting surface 121 to the diffusion sheet 3. In addition, the light beam emitted by the light-emitting unit 13 (for example, the angle θ1 of the normal line R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) will be deflected by the diffusion sheet 3, and The path of the incident path is emitted toward one side of the diffusion sheet 3 (the beam path C4 shown in Fig. 1).

It is worth mentioning that the reflective surface 121 of each reflective cavity 12A is disposed around the light emitting unit 13, and the height of the reflective cavity 12A is higher than the height of the light emitting unit 13, and the light emitting unit 13 is located at the bottom of the reflective cavity 12A. The light beam emitted by each of the light-emitting units 13 will not directly mix with the light beam emitted by the adjacent light-emitting unit 13; therefore, the direct-type backlight device D of the present invention can achieve good local (regional) control. Local Dimming effect.

Please refer to FIG. 7 and FIG. 8. FIG. 7 is a schematic diagram showing a single illumination unit 13 of the direct type backlight device of the present invention, and FIG. 8 is a side view of the illumination unit 13. As shown in the figure, each of the light-emitting units 13 has a top surface 131 and a ring-shaped light-emitting surface 132. The top surface 131 is located at an end surface of the light-emitting unit 13 opposite to the circuit board 11. The peripheral edge of the top surface 131 is opposite to the ring-emitting surface 132. In connection, the light beam emitted by the light-emitting unit 13 can be emitted outward through the ring-emitting surface 132 and the top surface 131.

Each of the light-emitting units 13 may include a light-emitting diode 14, a light-shielding member 15 and a light-transmissive body 16. The light-emitting diodes 14 have five light-emitting surfaces 141, 142, 143, 144, and 145, and the light-shielding member 15 is disposed. The light-emitting diode 14 is opposite to the one end surface (light-emitting surface 141) connected to the circuit board 11, and a part of the light beam which is emitted outward through the end surface (light-emitting surface 141) can be emitted outward through the half-shielding member 15, and the light-shielding is partially blocked. The member 15 can block another portion of the light beam that is emitted outward through the end surface (light emitting surface 141). The semi-shielding member 15 may be formed on the end surface (light-emitting surface 141) of the light-emitting diode 14 in a coating manner, and the semi-shielding member 15 may be made of, for example, a translucent material; for example, a semi-shielding The member 15 can be made of a reflective material that is thin enough to transmit light. In a particular application, the semi-shield 15 may be formed by stacking different refractive indices, such as a DBR reflective film.

In a specific application, the light-emitting unit 13 having the semi-shielding member 15 may have a light-emitting curve that is substantially in a heart shape, and the light-emitting unit 13 has a light-emitting intensity of less than 20% at a position of 0 degrees in the forward direction, and the light-emitting unit 13 The maximum light intensity is between -55 degrees and -75 degrees and between 55 degrees and 75 degrees.

The light transmissive body 16 is provided with the light shielding member 15 and the light emitting diode 14 , and the light transmitting body 16 is formed with the top surface 131 and the ring side surface 232 , and the top surface 131 and the light emitting surface 141 are disposed facing each other. The light beams emitted from the respective light-emitting diodes 14 can be emitted outward through the corresponding light-transmitting bodies 16. The light-transmitting body 16 is used to protect the light-emitting diode 14 and the light-shielding member 15 to prevent the light-emitting diode 14 and the light-shielding member 15 from being directly exposed and easily damaged. In different applications, the light-transmitting body 16 may be provided with diffusion particles, fluorescent particles, color conversion materials (for example, phosphors, semiconductor nano wafers), etc. It is determined according to the wavelength of the light beam emitted from the light-emitting diode 14, and is not limited thereto.

Through the arrangement of the semi-shielding member 15, the luminous flux of the light beam emitted outward through the top surface 131 of the light-transmitting body 16 will not be significantly larger than the luminous flux of the light beam emitted outward through the ring-shaped light-emitting surface 132 of the light-transmitting body 16, Therefore, the uniformity of the light beam emitted by the direct type backlight device D can be improved, and the user can easily directly observe the light spot formed by the light beam emitted from the top surface (ie, the light emitting surface 141) of each of the light emitting diodes. problem. In more detail, the direct type backlight device D provided with the semi-shielding member 15 has better light-emitting uniformity and is less likely to be used by the user than the direct-type backlight device D not provided with the half-shielding member 15. Obvious spots were observed.

In summary, the design of the direct-type backlight device D of the present invention through the design of the semi-shield 15 of each of the light-emitting units 13 and the design of the diffusion sheet 3 can greatly improve the uniformity of light emission of the direct-type backlight device D as a whole.

Referring to FIG. 6 , in a practical application, the direct type backlight device D may further include a Prism Sheet 4 and a Dual Brightness Enhancement Film 5 . In practical applications, the number of the cymbal 4 and the reflective brightness enhancing film 5 may vary according to requirements, and is not limited to a single piece.

The reflective brightness enhancing film 5 is disposed on a side of the diffusion sheet 3 opposite to the light source holder 1 (shown in FIG. 1), and the gusset 4 is disposed between the reflective brightness enhancement film 5 and the diffusion sheet 3. In a specific implementation, the diffusion sheet 3, the cymbal sheet 4, and the reflective brightness enhancement film 5 may be directly connected to each other without a gap, or may be formed with a gap according to requirements, and is not limited thereto.

The cymbal 4 may comprise a plurality of microstructures (not shown), and the plurality of microstructures may be used to change the path of the beam so that the passing beam can be concentrated in a predetermined range of viewing angles. The reflective brightness enhancing film 5 may be an optical film comprising a plurality of layers of different refractive indices, and the light beam entering the reflective brightness enhancing film 5 will be reflected and refracted between the multilayer optical films, and the setting of the reflective brightness enhancing film 5 will be The front luminance of the direct type backlight unit D and the brightness of the large viewing angle direction are improved. That is to say, the direct type backlight device D provided with the crotch panel 4 and the reflective brightness enhancement film 5 has uniform light output as a whole. The degree and its brightness will be further improved.

Please refer to FIG. 9 to FIG. 13 . FIG. 9 is a partially enlarged schematic view showing another embodiment of the direct type backlight device of the present invention. FIG. 10 is a top view of the reflective sheet body 2, and FIG. 11 is a partial enlarged view of FIG. Schematic, FIG. 12 is a schematic view of a single reflecting unit, and FIG. 13 is a side view of a single reflecting unit.

The difference between FIG. 9 and FIG. 6 is that a reflective sheet 2 may be disposed between the diffusion sheet 3 and the cymbal 4. The reflective sheet 2 may be attached to the diffuser body 3 opposite to the side facing the light source holder 1 (as shown in FIG. 1), or may be provided with a gap between the reflective sheet 2 and the diffusion sheet 3. .

As shown in FIG. 10 to FIG. 13 , specifically, the reflective sheet 2 may have a body 21 (shown in FIG. 13 ) and a plurality of reflecting units 22 , and the plurality of reflecting units 22 are disposed on one side of the body 21 . In practical applications, the body 21 and the plurality of reflecting units 22 may be integrally formed.

As shown in FIG. 11 to FIG. 13 , each of the reflection units 22 may include two regular triangular pyramid structures 23 , each of the regular triangular pyramid structures 23 has a bottom surface 231 , three side surfaces 232 and a vertex 233 , and the bottom surface 231 is disposed on the body. 21 (as shown in Figure 13). In practical applications, the three bottom edges 2311 of the respective bottom surfaces 231 are formed as one of the bottom edges 2311 of the bottom surfaces 231 of the other three regular triangular pyramid structures 23, that is, the bottom surfaces 231 of the adjacent two reflective units 22 There is a shared bottom edge 2311.

In a special application, the adjacent two reflecting units 22 may also have a gap with each other, that is, only two of the same triangular pyramid structures 23 in the same reflecting unit 22 have a common bottom edge 2311, which is not the same reflection. The regular triangular pyramid structure 23 in unit 22 does not have a common bottom edge 2311.

As shown in FIG. 1 and FIG. 8 , in practical applications, the length W3 of the bottom edge 2311 of each positive triangular pyramid structure 23, and the width W1 of each of the light emitting units 13 or the length L of each of the light emitting units 13 may be 1 :1 to 1:40, for example, the length W3 of the bottom edge 2311 may be between 50 micrometers (μm) and 200 micrometers, and the width W1 or the length L of the light-emitting unit 13 may be between 0.1 mm (mm). To 2.0 mm.

The ratio of the vertical height H3 of the bottom surface 231 to the apex 233 of each of the regular triangular pyramid structures 23 to the height H1 of each of the light emitting units 13 may be between 1:10 and 1:100, for example, the bottom surface 231 of each of the regular triangular pyramid structures 23. The vertical height to the apex 233 may be between 10 micrometers (μm) and 100 micrometers; the height of the light-emitting unit 13 may be between 0.1 millimeters (mm) and 1.7 mm.

Each side surface 232 of each regular triangular pyramid structure 23 is triangular, and three side surfaces 232 are respectively connected with three bottom edges 2311, and an angle θ2 between at least one side surface 232 and the bottom surface 231 may be between 40 degrees and 75 degrees, that is, The angle θ2 between the single side 232 and the bottom surface 231 is between 40 degrees and 75 degrees, or the angle θ2 between the two side surfaces 232 and the bottom surface 231 may be between 40 degrees and 75 degrees, or The angle θ2 between one side 232 and the bottom surface 231 is between 40 degrees and 75 degrees. In practical applications, the three sides 232 may have the same shape, but are not limited thereto.

It is particularly emphasized that the positive triangular pyramid structure 23 referred to herein means that the three bottom edges 2311 of the bottom surface 231 are equal in length, that is, the bottom surface 231 is an equilateral triangle, and the triangular shape of the three side surfaces 232 is not limited.

In a specific application, the reflectance of the small-angle beam emitted by the reflective sheet 2 for each of the light-emitting units 13 (the angle θ1 with respect to the normal R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) may be 50. %~80%, and the transmittance of the small-angle beam emitted by each of the light-emitting units 13 (the angle θ1 from the normal R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) passes through the diffusion sheet 3 may be Between 20% and 50%.

In a specific application, the reflectance of the large-angle beam (the angle θ1 with respect to the normal R of the light-emitting surface of the light-emitting diode 14) of the reflective sheet 2 for each of the light-emitting units 13 may be greater than 50 degrees. %~50%, and the transmittance of the large-angle beam (the angle θ1 with the normal R of the light-emitting surface of the light-emitting diode 14 is greater than 50 degrees) emitted by each of the light-emitting units 13 may pass through the diffusion sheet 3 Between 50% and 95%.

According to the above, the mutual cooperation of the reflective cavity 12A and the reflective sheet 2 can uniformly emit the light beam emitted outward through the reflective sheet 2, thereby improving the uniformity of the light beam emitted by the direct-type backlight device D as a whole. .

Referring to FIG. 14 and FIG. 15, FIG. 14 is a partial cross-sectional view showing another embodiment of the direct type backlight device of the present invention, and FIG. 15 is a partially enlarged schematic view of FIG. As shown in the figure, the difference between the present embodiment and the foregoing embodiment is that the direct type backlight device D may further include a blue light transmissive film 6 and a quantum dot film (Quantum Dot Enhancement Film) 7, and each of the light emitting units 13 is to emit a blue light beam.

The blue light transmissive film 6 can pass only the blue light beam, and the blue light transmissive film 6 is disposed between the reflective sheet body 2 and the light source holder 1. The quantum dot film 7 is disposed between the blue light transmissive film 6 and the reflective sheet body 2. The blue light beam emitted by each of the light-emitting units 13 can enter the quantum dot film 7 through the blue light penetrating film 6, and the quantum dot film 7 can convert the blue light beam into a white light beam.

In practical applications, a gap S3 is formed between the quantum dot film 7 and the diffusion sheet 3, and the gap S3 may be filled with air (ie, an air layer), and a part of the white light beam emitted through the quantum dot film 7 will be The diffusion sheet 3 and the blue light transmission film 6 are repeatedly reflected between each other, whereby the amount of quantum dots in the quantum dot film 7 can be reduced, and the overall light extraction efficiency can be improved. In practical applications, the distance S31 of the gap S3 formed between the quantum dot film 7 and the diffusion sheet 3 may be less than or equal to 2 mm. It is worth mentioning that a gap S4 may also be formed between the blue light transmissive film 6 and the light source holder 1, and the distance S41 of the gap S4 may be less than or equal to 2 mm.

The above description is only a preferred and feasible embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the schema are included in the scope of protection of the present creation. .

Claims (10)

A direct type backlight device comprising: a light source holder comprising: a circuit board; a plurality of reflective cup structures fixedly disposed on one side of the circuit board, each of the reflective cup structures being remote from the circuit board a side of the side of the circuit board is recessed to form a reflective cavity; and a plurality of light emitting units, each of the light emitting units is fixedly disposed on the circuit board, and the plurality of the light emitting units are correspondingly located in the plurality of Each of the light-emitting units includes a light-emitting diode, a light-shielding member, and a light-transmitting body, wherein the light-emitting diode has five light-emitting surfaces, and the light-shielding member is disposed on the light-emitting diode The body is opposite to an end surface connected to the circuit board, and a part of the light beam emitted outward through the end surface can be emitted outward through the semi-shield member, and the semi-shield member can block outward through the end surface a portion of the light beam emitted; the light transmissive body is disposed to cover the light shielding member and the light emitting diode, and the light beam emitted by each of the light emitting diodes can pass through the corresponding light transmitting body Shot; and a spread a body disposed above the light source holder, the opposite sides of the diffusion sheet body being defined as an inner side surface and an outer side surface, the inner side surface facing the light source holder, and the diffusion sheet body corresponding to The plurality of reflective cavities have a plurality of reflective regions, each of the reflective regions is formed with a plurality of reflective bumps, and a plurality of the reflective bumps are formed on at least one of the inner side surface and the outer side surface. A plurality of the reflective bumps in each of the reflective regions are radially arranged, and a plurality of the reflective bumps in each of the reflective regions are arranged closer to each other in a position closer to the light emitting unit. a plurality of the reflective bumps in each of the reflective regions are arranged more sparsely away from a position of the light emitting unit; a plurality of the reflective bumps can a portion of the light beam emitted from the light emitting unit is reflected toward the light source holder, and the diffusion sheet body can pass a partial light beam emitted from the light source holder; wherein sidewalls of each of the reflective chambers are formed As a reflecting surface, the reflecting surface of each of the reflecting cavities can reflect a part of the light beams emitted by the corresponding light emitting unit to emit the light beam toward the diffusing film body. The direct type backlight device of claim 1, wherein a width to height ratio of each of the reflective cavities is between 2:1 and 6:1. The direct type backlight device of claim 1, wherein each of the reflection cavities has an arc-shaped section adjacent to the circuit board, and the arcuate section has a curvature of 0.6 to 0.95. The direct type backlight device of claim 1, wherein each of the reflective bumps has a height of less than 10 micrometers; and each of the reflective bumps has an outer diameter of between 30 micrometers and 500 micrometers. The direct type backlight device of claim 1, wherein a gap is formed between the diffusion sheet body and the light source holder, the pitch is less than or equal to 2 mm; and the length of the light emitting unit is 0.1 PCT to 2 mm, the width of the light-emitting unit is from 0.1 mm to 2 mm, and the height of the light-emitting unit is from 0.1 mm to 1.7 mm. The direct type backlight device of claim 1, wherein the direct type backlight device further comprises a cymbal sheet and a reflective brightness enhancement film, wherein the reflective brightness enhancement film is disposed on the diffusion sheet body opposite to the One side of the light source holder, the cymbal is disposed between the diffusion sheet body and the reflective brightness enhancing film; the length of the light emitting unit is between 0.1 mm and 2 mm, and the light emitting unit The width is between 0.1 mm and 2 mm, and the height of the light-emitting unit is between 0.1 mm and 1.7 mm. The direct type backlight device of claim 1, wherein the direct type backlight device further comprises a blue light penetrating film and a quantum dot film capable of passing only the blue light beam, the blue light penetrating a film is disposed between the diffusion sheet body and the light source holder, the quantum dot film is disposed between the blue light transmission film and the diffusion sheet body, and each of the light emitting units emits a blue light beam, and The blue light beam emitted by each of the light emitting units can enter the quantum dot film through the blue light penetrating film, and the quantum dot film can convert the blue light beam into a white light beam. The direct type backlight device of claim 1, wherein the direct type backlight device further comprises a reflective sheet body and a cymbal sheet, wherein the cymbal sheet is disposed on the diffusion sheet body opposite to the light source holder On the side, the reflective sheet body is disposed between the diffusion sheet body and the cymbal sheet. The direct type backlight device of claim 8, wherein the reflective sheet body has a body, one side of the body is provided with a plurality of reflecting units, and each of the reflecting units comprises two regular triangular pyramid structures. The direct type backlight device of any one of claims 1 to 9, wherein a plurality of the reflection bumps are spaced apart from each other, each of the reflection regions having a center point, the center point corresponding to the Directly above the light-emitting unit, a plurality of the reflection bumps of each of the reflection regions are arranged in a plurality of annular structures centering on the center point, and a plurality of the annular structures are spaced apart from each other.