TW202024693A - A direct type backlight device - Google Patents

Abstract

A direct type backlight device comprise a light base and a reflection film. The light base comprise a circuit board. The circuit board has a plurality of reflective cup structure and a plurality of light unit. Each of the reflective cup structure has a reflection cavity. Each of the light unit is arranged on the circuit board and each of the light unit is located in the reflection cavity. Some light emitted from the light unit will pass through the reflection film directly. Some light emitted from the light unit is reflected to the reflection film by the reflection cavity. Some light emitted from the light unit is reflected to the reflection cavity by reflection film. The invention can achieve good radiating performance then the known technology.

Description

Direct type backlight device

The invention relates to a backlight device, in particular to a direct type backlight device.

The light source modules of existing large-scale display devices (such as TVs, etc.) can be roughly divided into edge-lit type and direct-lit type. Direct-lit backlight modules have better color performance than edge-lit backlight modules. Therefore, the direct-lit type The backlight module is one of the main technologies developed by related manufacturers in recent years. Of course, the existing direct-lit backlight modules are prone to inconsistencies in the brightness of each area, resulting in dark and bright areas, which is commonly known as the Mura phenomenon.

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

In order to achieve the above objective, the present invention provides a direct type backlight device, which includes a light source base and a reflective sheet body. The light source base includes: a circuit board, a plurality of reflective cup structures and a plurality of light-emitting units. A plurality of reflecting cup structures are fixedly arranged on one side of the circuit board, and each reflecting cup structure is recessed to form a reflecting cavity from the side far away from the circuit board to the side close to the circuit board. Each light-emitting unit is fixedly arranged on the circuit board, and a plurality of light-emitting units are correspondingly located in a plurality of reflective cavities. Each light-emitting unit includes a light-emitting diode, a half-shading member and a light-transmitting body. The light-emitting diode has five light-emitting surfaces , The semi-shielding element is arranged on the end face of the light-emitting diode opposite to the circuit board, part of the light beam emitted through the end face can be emitted outward through the semi-shading element, and the semi-shading element can block the end face from being emitted outward Part of the light beam; the light-transmitting body covers the semi-shading parts and the light-emitting diodes are arranged, and the light beams emitted by each light-emitting diode can be emitted out through the corresponding light-transmitting body. The reflective sheet is arranged above the light source seat, and the reflective sheet Part of the light beam emitted by the light source base is reflected in the direction of the light source base, and the reflective sheet body can pass part of the light beam emitted from the light source base. Wherein, the side wall forming each reflecting cavity is a reflecting surface, and the reflecting surface of each reflecting cavity can reflect a part of the light beam emitted by the corresponding light-emitting unit, so that the light beam is emitted toward the direction of the reflecting sheet body.

The beneficial effect of the present invention may be that: the direct-lit backlight device of the present invention has better light output uniformity than the existing direct-lit backlight module, that is, the direct-lit backlight device of the present invention can greatly improve the existing direct-lit backlight module It is easy to have obvious dark and bright areas.

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. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the present invention.

D‧‧‧Direct backlight device

1‧‧‧Light source base

11‧‧‧Circuit board

12‧‧‧Reflective cup structure

12A‧‧‧Reflecting cavity

12B‧‧‧Accommodating hole

121‧‧‧Reflecting surface

121A‧‧‧Curved section

13‧‧‧Lighting Unit

131‧‧‧Top surface

132‧‧‧Ring light-emitting surface

14‧‧‧Light Emitting Diode

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

15‧‧‧Semi-shielding

16‧‧‧Translucent body

2‧‧‧Reflective sheet body

21‧‧‧Ontology

22‧‧‧Reflection unit

23‧‧‧Triangular pyramid structure

231‧‧‧Bottom

2311‧‧‧Bottom

232‧‧‧ side

233‧‧‧Vertex

3‧‧‧Diffusion film

4‧‧‧Silver

5‧‧‧Reflective brightness enhancement film

6‧‧‧Blue light penetrating film

7‧‧‧Quantum dot film

S1‧‧‧Gap

S11‧‧‧Distance

S2‧‧‧Gap

S21‧‧‧Distance

S3‧‧‧Gap

S31‧‧‧Distance

S4‧‧‧Gap

S41‧‧‧Distance

L‧‧‧length

W1‧‧‧Width

W2‧‧‧Width

W3‧‧‧length

H1‧‧‧Height

H2‧‧‧Height

H3‧‧‧Height

C1‧‧‧Beam Path

C2‧‧‧Beam Path

C3‧‧‧Beam Path

C4‧‧‧Beam Path

θ1‧‧‧Included angle

θ2‧‧‧Included angle

R‧‧‧Normal

1 is a schematic partial cross-sectional view of a direct type backlight device according to a first embodiment of the 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 partial enlarged schematic diagram of Fig. 2.

4 is a schematic cross-sectional view of the reflective cup structure of the direct type backlight device of the present invention.

Fig. 5 is a top view of the direct type backlight device of the present invention.

Fig. 6 is a partial enlarged schematic diagram of Fig. 5.

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

FIG. 8 is a top view of a single reflecting unit of the direct type backlight device of the present invention.

Fig. 9 is a side view of a single reflecting unit of the direct type backlight device of the present invention.

FIG. 10 is a three-dimensional schematic diagram of the light emitting unit of the direct type backlight device of the present invention.

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

FIG. 12 is a schematic partial cross-sectional view of the second embodiment of the direct type backlight device of the present invention.

Fig. 13 is a partial enlarged schematic diagram of Fig. 12.

14 is a schematic partial cross-sectional view of the third embodiment of the direct type backlight device of the present invention Figure.

Fig. 15 is a partial enlarged schematic diagram of Fig. 14.

In the following description, if it is pointed out, please refer to a specific drawing or as shown in a specific drawing, it is only used to emphasize that in the subsequent description, most of the related content appears in the specific drawing. However, it is not limited that only the specific drawings can be referred to in this subsequent description.

Please refer to FIG. 1, which shows a schematic cross-sectional view of the first embodiment of the direct type backlight device of the present invention. As shown in the figure, the direct type backlight device D of the present invention includes: a light source base 1 and a reflective sheet 2. It should be noted that the main difference between the direct-lit backlight device D of the present invention and the conventional direct-lit backlight module is: the light source base 1 and the reflective sheet 2. The following description will mainly focus on the light source base 1 and the reflective sheet body 2 in detail, but it does not mean that the direct-lit backlight device D of the present invention only has the light source base 1 and the reflective sheet body 2, and the direct-lit 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, a reflective sheet 2 is provided above the light source base 1 of the direct type backlight device 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 multiple reflective cup structures 12 are arranged next to each other on one side of the circuit board 11, and the multiple light emitting units 13 are fixedly arranged on the circuit board 11, and the plurality of light-emitting units 13 are correspondingly located in the plurality of reflective cup structures 12.

A gap S1 is formed between the reflective sheet body 2 and the light source base 1. The gap S1 may be filled with air (that is, an air layer), and the reflective sheet body 2 may be fixedly arranged in a structure such as a frame body of the direct-lit backlight device D. Above the light source base 1. As shown in FIGS. 1, 10, and 11, in practical applications, the length L of each light-emitting unit 13 can be between 0.1 mm (mm) and 2 mm, and the width W1 of the light-emitting unit 13 can be between 0.1 mm. Mm to 2 mm, 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 reflective sheet body 2 and the light source base 1 may be less than or equal to 2 Millimeters. Through the design of the above air layer, it will be more advanced The uniformity of light output of the direct-lit backlight device D is increased in one step.

Please refer to FIGS. 2 to 4 together. FIG. 2 shows a top view of the light source holder, FIG. 3 is a partial enlarged schematic view of FIG. 2, and FIG. 4 is a cross-sectional schematic view of a single reflector cup structure and a light emitting unit disposed therein. A plurality of reflector cup structures 12 can be arranged closely to each other on the circuit board 11, that is, two adjacent reflector cup structures 12 can be arranged with no spacing between them, but it is not limited to this. In special applications The two reflective cup structures 12 adjacent to each other may also have a small distance that has been appropriately designed (without affecting the light uniformity of the entire direct-lit backlight device D). As shown in FIGS. 2 and 3, each reflecting cup structure 12 in its upper view can be approximately square, but not limited to this, the appearance of each reflecting cup structure 12 in its upper view may be According to changes in demand, for example, it can be rectangular, circular, oval, etc.

As shown in FIG. 4, one side of each reflective cup structure 12 is fixedly arranged on the circuit board 11, and each reflective cup structure 12 has a reflective cavity 12A recessed from the side away from the circuit board 11 to the side close to the circuit board 11. Each reflective cup structure 12 is fixed to the circuit board 11 on one side and also has an accommodating hole 12B, the accommodating hole 12B is located at the bottom of the reflective cavity 12A, and the light-emitting unit 13 provided on the circuit board 11 passes through the accommodating hole 12B. Set up.

The side wall forming each reflecting cavity 12A is a reflecting surface 121. The reflecting surface 121 of each reflecting cavity 12A can reflect a part of the light beam emitted by the corresponding light-emitting unit 13 so that the light beam is emitted toward the direction of the reflecting sheet 2. 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 arranged around the light emitting unit 13.

In practical applications, each reflective cavity 12A has an arc-shaped section 121A adjacent to the circuit board 11, and the curvature (Rho) of the arc-shaped section 121A is 0.6 to 0.95, whereby the reflective cavity 12A can be more effective The light beam emitted by the light-emitting unit 13 is reflected in the direction of the reflective sheet 2. It is worth mentioning that the ratio of the width W2 to the height H2 of each reflective cup structure 12 can be between 2:1 and 6:1, but not limited to this. The size and appearance of the reflective cavity 12A can be based on the light emission Unit 13 is different change. The appearance of the reflective cavity 12A can be changed according to requirements. In different embodiments, the reflective cavity 12A may also have no arc-shaped section 121A, and the reflective cavity 12A as a whole may be in the shape of a rectangular cube and an inverted terrace. State etc.

In specific applications, the reflectivity of the reflective surface 121 of the reflective cup structure 12 is preferably higher than 90%. The reflective cup structure 12 can be made of a high-reflectivity material. For example, it can be made of a resin containing a high-reflective material composed of metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide. In different applications, the reflective cup structure 12 can be made of a material with low reflectivity, and then set on the wall surface forming the reflective cavity 12A (for example, by coating) a layered structure with high reflectivity, The side of the layered structure with high reflectivity can be correspondingly formed as the aforementioned reflective surface 121.

Please refer to FIGS. 5-9 together. FIG. 5 is a top view of the reflective sheet body 2 of the direct-lit backlight device D of the present invention, FIG. 6 is a partial enlarged schematic view of FIG. 5, and FIG. 7 is a schematic view of a single reflective unit. Fig. 8 is a top view of a single reflecting unit, and Fig. 9 is a side view of a single reflecting unit.

The reflective sheet 2 is arranged above the light source base 1. Specifically, the reflective sheet 2 may have a main body 21 (as shown in FIG. 9) and a plurality of reflective units 22, the multiple reflective units 22 are arranged on one side of the main body 21, and the reflective sheet 2 is arranged on the light source base. When it is above 1, a plurality of reflecting units 22 are arranged facing the light source base 1. In practical applications, the main body 21 and the multiple reflecting units 22 may be integrally formed.

As shown in FIGS. 7-9, each reflecting unit 22 may include two regular triangular pyramid structures 23. Each regular triangular pyramid structure 23 has a bottom surface 231, three side surfaces 232, and a vertex 233. The bottom surface 231 is disposed on the body. 21 (as shown in Figure 9). In practical applications, the three bottom edges 2311 of each bottom surface 231 are respectively 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 two adjacent reflecting units 22 With a common bottom 2311.

In special applications, two adjacent reflecting units 22 can also have a gap between each other, that is, only two regular triangular pyramid structures 23 in the same reflecting unit 22 are It has a common base 2311, and the regular triangular pyramid structure 23 in the non-identical reflecting unit 22 does not have a common base 2311.

As shown in Figures 8, 10 and 11, in practical applications, the ratio of the length W3 of the base 2311 of each regular triangular pyramid structure 23 to the width W1 of each light-emitting unit 13 or the length L of each light-emitting unit 13 may be It is between 1:1 and 1:40. For example, the length W3 of the bottom side 2311 can be between 50 micrometers (μm) and 200 micrometers, and the width W1 or length L of the light emitting unit 13 can be between 0.1 mm (mm) to 2.0 mm.

As shown in FIGS. 9 to 11, the ratio of the vertical height H3 from the bottom surface 231 to the apex 233 of each regular triangular pyramid structure 23 to the height H1 of each light emitting unit 13 may be between 1:10 and 1:100. For example, The vertical height from the bottom surface 231 to the apex 233 of each regular triangular pyramid structure 23 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.

As shown in FIGS. 7-9, each side surface 232 of each regular triangular pyramid structure 23 is a triangle, and the three side surfaces 232 are respectively connected to three bottom sides 2311, and the angle θ2 between at least one side surface 232 and the bottom surface 231 can be between 60 degrees. To 100 degrees, that is, the included angle θ2 between only one side surface 232 and the bottom surface 231 is between 60 degrees and 100 degrees, or the included angle θ2 between the two side surfaces 232 and the bottom surface 231 is between 60 degrees. The angle θ2 between any one of the side surfaces 232 and the bottom surface 231 is between 60 degrees and 100 degrees. In practical applications, the three sides 232 may have the same shape, but it is not limited thereto.

It is particularly emphasized that the regular triangular pyramid structure 23 referred to here refers to the three bottom sides 2311 of the bottom surface 231 having the same length, that is, the bottom surface 231 is a regular triangle, and there is no limitation on the triangle of the three side surfaces 232.

Please refer to FIG. 1 again. The imaginary line shown in the figure represents the light beam path (light path) emitted by each light emitting unit 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 directed to the direction of the reflecting sheet 2 to be emitted (beam path C3 shown in Fig. 1 ). 121 reverse through the reflective surface If the emitted light beam enters the reflective sheet 2 in a direction perpendicular to the bottom surface 231 of one of the regular triangular pyramid structures 23, it will directly pass through the reflective sheet 2, and the reflective sheet 2 is opposite to the one of the light source base 1. Eject from the side outwards (beam path C2 shown in Figure 1). If the light beam reflected by the reflective surface 121 enters the reflector body 2 in a direction not perpendicular to one of the regular triangular pyramid structures 23, it will be reflected by the regular triangular pyramid structure 23 and return to the original or another reflective cavity 12A (The beam path C1 shown in FIG. 1) is again reflected by the reflecting surface 121 to the reflecting sheet body 2. In addition, the light beam with a large angle (for example, the angle θ1 with the normal line R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) emitted by the light-emitting unit 13 will pass through the refraction of the reflector body 2 and deviate from the original The path of the incident path is emitted to one side of the reflective sheet 2 (beam path C4 as shown in FIG. 1).

In a specific application, the reflectivity of the reflective sheet 2 for the small-angle light beams emitted by each light-emitting unit 13 (the angle θ1 with the normal R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) may be between 50 degrees. %~80%, and the small-angle light beam emitted by each light-emitting unit 13 (the angle θ1 with the normal line R of the light-emitting surface of the light-emitting diode 14 is less than 50 degrees) through the reflector body 2 can be Between 20%~50%.

In a specific application, the reflectance of the reflective sheet body 2 for the large-angle light beams emitted by each light-emitting unit 13 (the angle θ1 with the normal R of the light-emitting surface of the light-emitting diode 14 is greater than 50 degrees) may be between 5. %~50%, and the large-angle light beam emitted by each light-emitting unit 13 (the angle θ1 with the normal line R of the light-emitting surface of the light-emitting diode 14 is greater than 50 degrees) through the reflector body 2 can be Between 50%~95%.

As mentioned above, through the cooperation of the reflective cavity 12A and the reflective sheet body 2, the light beams emitted outward through the reflective sheet body 2 can be uniformly emitted, thereby improving the uniformity of the light beam emitted by the direct-lit backlight device D as a whole .

It is worth mentioning that the reflecting surface 121 of each reflecting cavity 12A is arranged around the light emitting unit 13, and the height of the reflecting 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 reflecting cavity 12A, thereby , The light beams emitted by each light-emitting unit 13 will not directly mix with the light beams emitted by the adjacent light-emitting unit 13; therefore, the direct-lit backlight device D of the present invention can achieve good Local (regional) light control (Local Dimming) effect.

Please refer to FIGS. 10 and 11. FIG. 10 is a schematic diagram of a single light-emitting unit 13 of the direct-lit backlight device of the present invention, and FIG. 11 is a side view of the light-emitting unit 13. As shown in the figure, each light-emitting unit 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 end surface connected to the circuit board 11. The periphery of the top surface 131 is opposite to the ring-shaped light-emitting surface 132 When connected, the light beam emitted by the light emitting unit 13 can be emitted outward through the ring light emitting surface 132 and the top surface 131.

Each light-emitting unit 13 may include a light-emitting diode 14, a half-shielding member 15, and a light-transmitting body 16. The light-emitting diode 14 has five light-emitting surfaces 141, 142, 143, 144, 145, and the half-shielding member 15 is provided. 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 beams emitted outward through the end surface (light emitting surface 141) can be emitted outward through the semi-shielding member 15, but half-shielded The member 15 can block another part of the light beam emitted outward through the end surface (light emitting surface 141). The semi-shielding member 15 may be formed by coating on the end surface (light emitting surface 141) of the light-emitting diode 14, and the semi-shielding member 15 may be made of a translucent material; for example, the semi-shielding member 15 The member 15 may be made of a reflective material thin enough to transmit light. In a specific application, the semi-shielding member 15 may be stacked with different refractive indexes, for example, a DBR reflective film.

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

The light-transmitting body 16 is arranged to cover the semi-shielding member 15 and the light-emitting diode 14. 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 by each light-emitting diode 14 can be emitted outward through the corresponding light-transmitting body 16. The light-transmitting body 16 is used to protect the light-emitting diode 14 and the semi-shielding member 15 to prevent the light-emitting diode 14 and the semi-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 (such as phosphors, semiconductor nanochips), etc., can be determined according to the wavelength of the light beam emitted by the light-emitting diode 14 and are not limited here.

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 greater than the luminous flux of the light beam emitted outward through the annular light-emitting surface 132 of the light-transmitting body 16. Therefore, the uniformity of the light beam emitted by the direct-lit backlight device D can be improved, and the user can avoid directly observing the light spots formed by the light beams from the top surface of each light-emitting diode (ie, the light-emitting surface 141). problem. In more detail, the direct-lit backlight device D provided with the semi-shielding member 15 has better light output uniformity than the direct-lit backlight device D without the semi-shielding member 15 and is less likely to be used by users Obvious light spots are observed.

In summary, the direct-lit backlight device D of the present invention can greatly improve the overall light output uniformity of the direct-lit backlight device D through the design of the semi-shielding member 15 of each light-emitting unit 13 and the design of the reflective sheet 2.

Please refer to FIG. 12 and FIG. 13. FIG. 12 is a partial cross-sectional schematic diagram of the second embodiment of the direct type backlight device of the present invention, and FIG. 13 is a partial enlarged schematic diagram of FIG. 12. It should be noted that the reflective sheet body 2 and the multiple regular triangular pyramid structures 23 shown in FIG. 13 are the same as the reflective sheet body 2 of the first embodiment of the direct-lit backlight device D of the present invention. However, the biggest difference between this embodiment and the foregoing first embodiment is that the direct-lit backlight device D of the present invention may also include a diffuser film 3, a Prism Sheet 4, and a reflective increaser. Brightness film (Dual Brightness Enhancement Film)5. In practical applications, the number of the diffusion film 3, the diffusive sheet 4, and the reflective brightness enhancement film 5 can be changed according to requirements, and is not limited to a single sheet.

The diffusion film 3 is arranged between the reflection sheet 2 and the light source base 1. A gap S2 is formed between the diffusion film 3 and the light source base 1; in practical applications, the distance S21 of the gap S2 can be, for example, less than or equal to 2 mm, but is not limited to this. The reflective brightness enhancement film 5 is located on the side of the reflective sheet body 2 opposite to the side facing the diffuser film 3, and the diffusive sheet 4 is located between the reflective brightness enhancement film 5 and the reflective sheet body 2. Reflective sheet body 2, diffusion film 3, 稜鏡 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, which is not limited here.

The diffusion film 3 may contain diffusion particles, so that the light beam can be refracted and reflected in a specific direction, so that the passing light beam can be emitted out more uniformly. The sheet 4 may include a plurality of microstructures (not shown), and the plurality of microstructures can be used to change the path of the light beam so that the passing light beam can be concentrated in a predetermined viewing angle range. The reflective brightness enhancement film 5 may include multiple optical films with different refractive indices, and the light beam entering the reflective brightness enhancement film 5 will be reflected and refracted between the multiple optical films, and the setting of the reflective brightness enhancement film 5 will be able to Improve the front brightness of the direct-lit backlight device D and the brightness in the direction of the large viewing angle.

In another implementation application, the side of the diffusion film 3 facing the light source base 1 may also have multiple reflection point structures (not shown), and each reflection point structure can make a part of the light beam from the light source base 1 to the light source base 1, that is to say, part of the light beam emitted by the light source holder 1 will be reflected by the reflection point structure and enter the reflection cup structures 12 again, and the other part of the light beam emitted by the light source holder 1 will be After being reflected by the microstructure in the diffusion film 3, the diffusion film 3 is emitted from the side opposite to the light source base 1. In practical applications, the multiple reflection dot structures can be formed on the diffusion film 3 by printing, but it is not limited to this.

According to the above, the direct-lit backlight device D of this embodiment can further improve the overall light output uniformity and light output of the direct-lit backlight device D through the arrangement of the diffusion film 3, the diffusor sheet 4, and the reflective brightness enhancement film 5 brightness.

Please refer to FIGS. 14 and 15 together. FIG. 14 is a schematic partial cross-sectional view of a third embodiment of the direct type backlight device of the present invention, and FIG. 15 is a partial enlarged schematic view of FIG. 14. As shown in the figure, the biggest difference between this embodiment and the previous embodiment is that the direct-lit backlight device D may also include a blue light penetrating film 6 and a quantum dot film (Quantum Dot Enhancement Film) 7, and each light-emitting unit 13 is to emit a blue light beam.

The blue light penetrating film 6 can only pass blue light beams, and the blue light penetrating film 6 is arranged on the reverse Between the emission sheet body 2 and the light source base 1, the quantum dot film 7 is arranged between the blue light penetrating film 6 and the reflection sheet body 2. The blue light beam emitted by each light-emitting unit 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 film 3. The gap S3 may be filled with air (that is, an air layer), and part of the white light beam emitted through the quantum dot film 7 will reflect The sheet 2 and the blue light penetrating film 6 are repeatedly reflected, thereby reducing the demand for quantum dots in the quantum dot film 7 and improving the overall light extraction efficiency. In practical applications, the distance S31 of the gap S3 formed between the quantum dot film 7 and the diffusion film 3 may be less than or equal to 2 millimeters (mm). It is worth mentioning that a gap S4 may also be formed between the blue light penetrating film 6 and the light source base 1, and the distance S41 of the gap S4 may be less than or equal to 2 millimeters (mm).

In particular, the direct-lit backlight device D of this embodiment can also be provided with the diffuser film 3, the diffusor sheet 4, and the reflective brightness enhancement film 5 of the previous embodiment, but it is not limited to these components.

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

D‧‧‧Direct backlight device

1‧‧‧Light source base

11‧‧‧Circuit board

12‧‧‧Reflective cup structure

121‧‧‧Reflecting surface

121A‧‧‧Curved section

12A‧‧‧Reflecting cavity

12B‧‧‧Accommodating hole

13‧‧‧Lighting Unit

14‧‧‧Light Emitting Diode

15‧‧‧Semi-shielding

16‧‧‧Translucent body

2‧‧‧Reflective sheet body

S1‧‧‧Gap

S11‧‧‧Distance

C1‧‧‧Beam Path

C2‧‧‧Beam Path

C3‧‧‧Beam Path

C4‧‧‧Beam Path

W2‧‧‧Width

H2‧‧‧Height

R‧‧‧Normal

θ1‧‧‧angle

Claims (14)

A direct type backlight device, comprising: a light source base, comprising: a circuit board; a plurality of reflective cup structures, which are fixedly arranged on one side of the circuit board, and each of the reflective cup structures is moved away from the circuit board A reflective cavity is recessed on the side close to the circuit board on one side; and a plurality of light-emitting units, each of the light-emitting units is fixedly arranged on the circuit board, and the multiple light-emitting units are correspondingly located in a plurality of In the reflective cavity, each of the light-emitting units includes a light-emitting diode, a half-shielding member, and a light-transmitting body. The light-emitting diode has five light-emitting surfaces, and the half-shielding member is disposed on the light-emitting diode. The body is opposite to the one end surface connected to the circuit board, and part of the light beams emitted through the end surface can be emitted outward through the half-shielding member, and the half-shielding member can block passing through the end surface outward Part of the light beam emitted; the light-transmitting body covers the semi-shading member and the light-emitting diodes, and the light beams emitted by each light-emitting diode can pass through the corresponding light-transmitting body outward And a reflective sheet body, which is arranged above the light source seat, the reflective sheet body can reflect part of the light beam emitted from the light source seat in the direction of the light source seat, and the reflective sheet body can Part of the light beam emitted from the light source holder is allowed to pass; wherein, the side wall forming each of the reflecting cavities is a reflecting surface, and the reflecting surface of each of the reflecting cavities can reflect the corresponding light emitting unit Part of the light beam is emitted so that the light beam is emitted toward the direction of the reflector body. The direct type backlight device according to claim 1, wherein the ratio of the width to the height of each of the reflective cavities is between 2:1 and 6:1. The direct type backlight device according to claim 1, wherein each of the reflective cavities There is an arc section adjacent to the circuit board, and the curvature of the arc section is 0.6 to 0.95. The direct type backlight device according to claim 1, wherein a distance is formed between the reflective sheet body and the light source base, and the distance is less than or equal to 2 mm; and the length of the light emitting unit is between 0.1 mm The width of the light-emitting unit 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-lit backlight device according to claim 1, wherein the direct-lit backlight device further includes a diffusion film, a dichroic sheet, and a reflective brightness enhancement film, the diffusion film being disposed on the reflective sheet body and the Between the light source bases, a distance is formed between the diffusion film and the light source base, and the distance is less than or equal to 2 mm; the reflective brightness enhancement film is located on the reflective sheet body opposite to facing the On one side of the diffuser film, the light-emitting sheet is located between the reflective brightness enhancement film and the reflective sheet body; the length of the light-emitting unit is between 0.1 mm and 2 mm, and the width of the light-emitting unit is between In the range of 0.1 mm to 2 mm, the height of the light-emitting unit ranges from 0.1 mm to 1.7 mm. The direct type backlight device according to claim 5, wherein the diffuser film has a side facing the light source base and has a plurality of reflection point structures, and each of the reflection point structures can make a portion from the light source base The partial light beam is reflected in the direction of the light source seat. The direct type backlight device according to claim 1, wherein the direct type backlight device further comprises a blue light penetrating film and a quantum dot film, the blue light penetrating film can only pass blue light beams, and the blue light penetrating film The transparent film is arranged between the reflective sheet body and the light source base, the quantum dot film is arranged between the blue light penetrating film and the reflective sheet body, each of the light-emitting units emits blue light beams, and The blue light beam emitted by each of the light-emitting units can pass through the blue light The film enters the quantum dot film, and the quantum dot film can convert a blue light beam into a white light beam. The direct type backlight device according to any one of claims 1 to 7, wherein the reflective sheet body has a body, one side of the body is provided with a plurality of reflective units, and each of the reflective units includes two A regular triangular pyramid structure. The direct-lit backlight device according to claim 8, wherein each of the regular triangular pyramid structures has a bottom surface and a vertex, and the bottom surface is disposed on the body; and three bottom edges forming each of the bottom surfaces are One of the bottom sides of the bottom surfaces of the other three regular triangular pyramid structures; wherein, the three bottom sides of each of the bottom surfaces have the same length. The direct type backlight device according to claim 8, wherein the ratio of the vertical height from the bottom surface to the apex of each of the regular triangular pyramid structures to the height of each light-emitting unit is between 1:10 and 1:100 . The direct type backlight device according to claim 8, wherein the ratio of the length of the bottom side of each of the regular triangular pyramid structures to the width of each light-emitting unit or the length of each light-emitting unit is 1: 1 to 1:40. The direct type backlight device according to claim 8, wherein the vertical height from the bottom surface to the apex of each of the regular triangular pyramid structures is between 10 μm and 100 μm; and the length of the light-emitting unit is between 0.1 km The width of the light-emitting unit 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 according to claim 8, wherein the length of the bottom side of each of the regular triangular pyramid structures is between 50 μm and 200 μm; and the length of the light emitting unit is between 0.1 mm and 2 mm. The width of the light-emitting unit 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-lit backlight device according to claim 8, wherein each of the regular triangular pyramid structures has three sides, each of the sides is a triangle, and the three sides are connected to the three bottom sides, and at least one The angle between the side surface and the bottom surface is between 60 degrees and 100 degrees.

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