TWM595765U - Direct type backlight device - Google Patents

Abstract

This creation discloses a direct type backlight device including a light source base and a reflective sheet body. The light source base includes a circuit board, multiple reflective cup structures and multiple light emitting units. The reflective sheet body includes a base material and a plurality of reflective layered structures disposed on the base material, the base material includes a plurality of reflective regions, and in each reflective region, a plurality of reflective layered structures are located at the center of the reflective region and the corners of the reflective region The edges of the reflection area and the reflection area are relatively densely arranged. Each reflection layer structure is used to reflect the light beam emitted by the light emitting unit. Through the setting of the reflective sheet body, the light beam emitted by the light source seat can be emitted more uniformly after passing through the reflective sheet body, which can improve the taste problem of the bright and dark areas in the conventional direct backlight device, and can also meet The need for thinning and reducing the number of light-emitting units used.

Description

Direct type backlight device

This creation relates to a backlight device, especially a direct type backlight device.

The light source module of the existing vehicle-mounted display can be roughly divided into an edge light type and a direct type. The direct type backlight module has better image performance than the edge type type backlight module. Therefore, the direct type backlight module is related in recent years. One of the main technologies developed by the manufacturer. However, the existing direct type backlight module is prone to the problem of inconsistency of brightness in various areas (that is, the taste problem commonly known in the industry).

The present invention discloses a direct-type backlight device, which is mainly used to improve the problems of dark areas and bright areas in direct-type backlight devices in the prior art.

One embodiment of this creation discloses a direct-lit backlight device, which includes: a light source holder and a reflective sheet body. The light source base includes: a circuit board, multiple reflective cup structures and multiple light emitting units. A plurality of reflective cup structures are fixedly arranged on one side of the circuit board, and each reflective cup structure is concavely formed on a side opposite to the circuit board to form a reflective cavity. A plurality of light-emitting units, each light-emitting unit is fixedly disposed on the circuit board, and the plurality of light-emitting units are correspondingly located in a plurality of reflective cavities. The reflective sheet body defines a plurality of reflective regions, the reflective sheet body is disposed above the light source holder, each reflective region corresponds to directly above each reflective cup structure, and the center of each reflective region corresponds to above the center of the light emitting unit. The reflective sheet body includes: a substrate and a plurality of reflective layered structures. Multiple reflective layered structures are formed on a wide side of the substrate, and the multiple reflective layered structures are distributed in multiple reflective areas. Each reflective layered structure can reflect the light beam emitted by the light source holder; in each reflective area Multiple reflective layered structures are arranged denser as they are closer to the center of the reflective area, densely arranged as the edges of the reflective area are closer, and densely arranged as the corners are closer to the reflective area; wherein, each reflective cavity is formed The side wall is a reflective surface, and the reflective surfaces of each reflective cavity can reflect part of the light beam emitted by the corresponding light emitting unit.

One embodiment of this creation discloses a direct-lit backlight device, which includes: a light source holder and a reflective sheet body. The light source base includes a circuit board, multiple reflective cup structures and multiple light emitting units. A plurality of reflective cup structures are fixedly arranged on one side of the circuit board, and each reflective cup structure is concavely formed on a side opposite to the circuit board to form a reflective cavity. Each light-emitting unit is fixedly disposed on the circuit board, and the multiple light-emitting units are correspondingly located in the multiple reflective cavities. The reflective sheet body defines a plurality of reflective regions, the reflective sheet body is disposed above the light source holder, each reflective region corresponds to directly above each reflective cup structure, and the center of each reflective region corresponds to above the center of the light emitting unit. The reflective sheet includes: a substrate and a reflective layer. The reflective layer is formed on a wide side of the substrate, the reflective layer can reflect the light beam emitted by the light source holder; the reflective layer includes a plurality of perforations, each perforation penetrates the reflective layer, and a part of the substrate can be exposed through the multiple perforations; The perforations are distributed in multiple reflective areas; the multiple perforations in each reflective area are arranged denser as they are farther away from the center of the reflective area, denserly arranged as they are farther away from the edge of the reflective area, and farther away from the reflective area The denser the corners are arranged; wherein, the side wall forming each reflection cavity is a reflection surface, and the reflection surface of each reflection cavity can reflect part of the light beam emitted by the corresponding light emitting unit.

In summary, the direct-type backlight device of the present invention has better light uniformity compared with 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, which is easy to exist The problem of obvious dark and bright areas.

In order to understand the characteristics and technical content of this creation, please refer to the following detailed description and drawings of this creation, but these descriptions and drawings are only used to illustrate this creation, not to make any protection to this creation. limit.

In the following description, if you are instructed to refer to a specific drawing or as shown in a specific drawing, it is only used to emphasize in the subsequent description, most of the related content mentioned in this specific drawing, However, it does not limit that only specific patterns can be referred to in the subsequent description.

Please refer to FIG. 1 to FIG. 5 together. FIG. 1 shows a schematic side view of a first embodiment of a direct-type backlight device of the present invention, and FIG. 2 shows a reflective cup structure of a first embodiment of the direct-type backlight device of the present invention. 3, a schematic side view of a light-emitting unit and a partial reflective sheet body. FIG. 3 shows a top schematic view of the reflective cup structure of the first embodiment of the direct-lit backlight device of the present invention. FIG. 4 is a partial enlarged schematic view of FIG. This is a three-dimensional schematic diagram of a single light-emitting unit of the first embodiment of the direct-type backlight device created for this.

As shown in FIG. 1, the direct-type backlight device 100 of the present invention includes: a light source holder 1 and a reflective sheet body 2. The light source base 1 includes: a circuit board 11, a plurality of reflective cup structures 12 and a plurality of light emitting units 13. A plurality of reflective cup structures 12 are fixed on one side of the circuit board 11. The plurality of reflective cup structures 12 may be closely arranged on the circuit board 11, that is, two adjacent reflective cup structures 12 may be arranged without a gap, but not limited to this. In special applications, the two reflective cup structures 12 adjacent to each other may also have a fine pitch that has been properly designed (without affecting the uniformity of light output of the direct backlight device 100 as a whole). As shown in FIGS. 3 and 4, each reflective cup structure 12 may be substantially square in its upper view, but not limited to this, the appearance of each reflective 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 FIGS. 1 and 2, each reflective cup structure 12 is concavely formed from a side away from the circuit board 11 to a side close to the circuit board 11, and a reflective cavity 121 is formed. The side of the reflective cavity 121 opposite to the circuit board 11 is a reflective surface 122, and the reflectivity of the reflective surface 122 may be greater than 90%. The reflective cup structure 12 may be made of a high-reflectivity material, for example, it may be made of a resin containing a high-reflective material composed of metal oxide particles such as titanium oxide, aluminum oxide, silicon oxide, etc., but not as In different applications, the reflective cup structure 12 may be made of resin that is not doped with highly reflective materials, and the reflective cavity 121 is provided on the side opposite to the circuit board 11 (for example, by coating) The layer structure with high reflectivity, and one side of the layer structure with high reflectivity can be correspondingly formed as the aforementioned reflective surface 122. In practical applications, the ratio of the width W to the height H of each reflective cavity 121 may be between 2:1 and 6:1, but not limited to this. The size and shape of the reflective cavity 121 may be based on the light emitting unit 13 Change accordingly.

It is worth mentioning that, in practical applications, in a schematic side view of the reflective cavity 121 (as shown in FIGS. 1 and 2 ), the position of each reflective cavity 121 adjacent to the circuit board 11 may have an arc-shaped section 123 In this way, the reflective cavity 121 can more effectively reflect the light beam emitted by the light emitting unit 13 in the direction of the reflective sheet body 2. Of course, in different embodiments, in a schematic side view of the reflective cavity 121, the reflective cavity 121 may also include only straight-line segments without any arc-shaped segments.

As shown in FIGS. 2 and 5, each light-emitting unit 13 is fixedly disposed on the circuit board 11, and each light-emitting unit 13 is correspondingly located in each reflective cavity 121, and each light-emitting unit 13 may be correspondingly located in the center of the reflective cavity 121 and the lowest position. In practical applications, the reflective cup structure 12 may include a container 124 for accommodating the light-emitting unit 13, and the light-emitting unit 13 is correspondingly disposed in the container 124. Each light-emitting unit 13 has a top light-emitting surface 13A and a ring-shaped light-emitting surface 13B. The periphery of the top light-emitting surface 13A is connected to the ring light-emitting surface 13B. The light beam intensity of the light-emitting unit 13 emitted by the top light-emitting surface 13A is lower than that emitted by the ring light-emitting surface 13B The intensity of the light beam.

In practical applications, the light intensity of each light-emitting unit 13 at a positive 0 degree may be less than 50%, and the maximum light intensity falls between -55°~-75° and 55°~75°, and The light pattern of each light-emitting unit 13 is roughly half-heart-shaped; the width W of each light-emitting unit 13 may be between 0.1 mm (mm) and 2 mm (mm), and the length of each light-emitting unit 13 may be between From 0.1 mm (mm) to 2 mm (mm), the height H of each light emitting unit 13 may be between 0.1 mm (mm) and 1.7 mm (mm).

As shown in FIG. 5, in a specific implementation, each light-emitting unit 13 may include a light-emitting diode 131, a half reflector 132 and a light-transmitting body 133. The light emitting diode 131 may be a rectangular cube, and the light emitting diode 131 has a top surface 1311 and four side surfaces 1312. The top surface 1311 is an end surface of the light emitting diode 131 opposite to the one connected to the circuit board 11, four The side surface 1312 is connected to the periphery of the top surface 1311.

The semi-reflecting member 132 is disposed on the top surface 1311 of the light emitting diode 131, and part of the light beam emitted outward through the top surface 1311 will be reflected by the semi-reflecting member 132, and the other part of the light beam can be emitted outward through the semi-reflecting member 132 . In practical applications, the semi-reflective member 132 may be formed on the top surface 1311 of the light-emitting diode 131 by coating, and the semi-reflective member 132 may be made of a translucent material; for example, The semi-reflecting member 132 may be made of a reflective material thin enough to allow the light beam emitted by the light emitting unit 13 to directly pass through. In a specific application, the semi-reflective member 132 may be formed by stacking sheet structures with different refractive indexes, for example, a distributed Bragg reflector (Distributed Bragg Reflector).

The light-transmitting body 133 covers the semi-reflecting member 132 and the light-emitting diode 131. The shape of the light-transmitting body 133 may be generally a rectangular cube, and the top light-emitting surface 13A and The ring light-emitting surface 13B, the top light-emitting surface 13A and the top surface 1311 are arranged to face each other, and the light beam emitted by the light-emitting diode 131 will be emitted outward through the transparent body 133 passing through. The light-transmitting body 133 is used to protect the light-emitting diode 131 and the semi-reflective element 132 to prevent the light-emitting diode 131 and the semi-reflective element 132 from being directly exposed and easily damaged. In practical applications, the semi-reflective member 132 may be reflective particles including silicon dioxide (SiO2), titanium dioxide (TiO2), and the like.

In practical applications, each light-emitting diode 131 may emit light beams of different wavelengths according to requirements. In the embodiment where the light emitting diode 131 emits a blue light beam with a wavelength of 460 nm to 470 nm, the light transmitting body 133 may be doped with a color conversion material, and the color conversion material may include, for example, phosphor, II- Group VI semiconductor nanocrystals or III-V semiconductor nanocrystals and other materials, and the blue light beam emitted by the light-emitting diode 131 passes through the color conversion material in the light-transmitting body 133 and is converted into white light beams to be emitted outward . In addition, the light-transmitting body 133 may be provided with diffused particles, etc., which is not limited here.

As described above, through the arrangement of the semi-reflecting member 132, the light flux of the light beam emitted from the top light emitting surface 13A of the light emitting unit 13 will be significantly lower than that of the light beam emitted from the ring light emitting surface 13B of the light emitting unit 13, Therefore, the uniformity of the light beam emitted by the direct-type backlight device 100 can be improved, and the problem that the light spot formed by the light beam emitted from the top light-emitting surface 13A of each light-emitting unit 13 is easily observed by the user is avoided. That is to say, the direct-type backlight device 100 provided with the semi-reflective member 132 has a better uniformity of light output than the direct-type backlight device 100 not provided with the semi-reflective member 132, and is less likely to be observed by the user To an obvious light spot.

It is worth mentioning that the light-emitting diode 131 of each light-emitting unit 13 can be a flip chip light-emitting chip (Flip chip), and each light-emitting unit 13 can also include an adapter plate 134. The interposer 134 includes an insulating structure and a conductive wiring structure. The flip-chip package light-emitting chip is fixed to the interposer 134, and the flip-chip package light-emitting chip is electrically connected to the conductive wiring structure, and the flip-chip package light-emitting chip passes through the interposer 134 , Fixed to the circuit board 11, and the flip-chip package light-emitting chip is electrically connected to the circuit board 11 through the adapter plate 134, and the circuit board 11 transmits power and control signals to the flip-chip package light-emitting chip through the adapter plate 134.

Through the arrangement of the adapter plate 134, the problem of peeling (Peeling) of the flip-chip package light-emitting chip during the mounting on the circuit board 11 can be greatly reduced; more specifically, in the prior art, the flip chip is directly The light-emitting chip is fixed on the circuit board 11. In this fixing method, during the fixing process, the electrode structure of the flip-chip light-emitting chip will be easily directly heated and expand, which will cause the problem of peeling of the electrode structure. On the contrary, if the flip chip light emitting chip is fixed to the circuit board 11 through the adapter plate 134, the related heat energy will not be easily transferred directly to the flip chip light emitting chip during the process of fixing the light emitting unit 13 to the circuit board 11 And most of the heat energy will be absorbed by the adapter plate 134 first, thereby, the above-mentioned peeling (Peeling) problem of the flip chip light emitting chip will not be easy to occur.

It is particularly emphasized that the specific types, forms, and wavelengths of light beams emitted by the light-emitting units 13 included in the direct-type backlight device 100 of the present invention are not limited to the above description, that is, in different embodiments Each light-emitting unit 13 of the direct-type backlight device 100 of the present invention may be a generally common light-emitting diode, and the top light-emitting surface thereof may not be provided with the aforementioned semi-reflective member 132.

Please refer to FIG. 1, FIG. 2 and FIG. 6 to FIG. 8 together. FIG. 6 shows a front view of a side surface of the reflector body of the first embodiment of the direct-type backlight device of the creation, and FIG. 7 shows the direct-down of the creation A front view of a single reflective area of the reflective sheet body of the first embodiment of the backlight device of the first embodiment. FIG. 8 shows a schematic perspective view of the reflective sheet body of the first embodiment of the direct-lit backlight device of the present invention.

The reflective sheet body 2 is provided above the light source holder 1. As shown in FIGS. 1 and 2, in practical applications, a gap G may be formed between the side of each reflective cup structure 12 of the light source base 1 in which the reflective cavity 121 is concavely formed and the reflective sheet body 2. The distance P of the gap G (as shown in FIG. 2) can be no more than 2 mm (mm), so that part of the light beams emitted by each light-emitting unit 13 is reflected by the corresponding reflective cup structure 12, a part of it will be irradiated To the position Q (as shown in FIG. 1) where the two reflective cup structures 12 are connected, in this way, it can help to improve the light uniformity of the direct-type backlight device 100. That is to say, in the embodiment where the gap G is formed between the reflective sheet body 2 and the light source holder 1, the uniformity of light output of the direct-type backlight device 100 will be higher than that between the reflective sheet body 2 and the light source holder 1 In the embodiment in which the gap G is not formed, the uniformity of light output of the direct type backlight device 100.

The reflective sheet body 2 includes a substrate 21 and multiple sets of reflective layered structures 22. The two wide sides opposite to each other of the substrate 21 are defined as an inner side 211 and an outer side 212, respectively. In practical applications, the thickness of the substrate 21 may be between 0.1 mm and 2 mm. The light beam emitted by the light-emitting unit 13 can pass through the substrate 21 from the inner side 211 of the substrate 21 where the reflective layered structure 22 is not provided, and exit outward from the outer side 212. The specific material of the substrate 21 and the structure contained therein are not limited herein. For example, the substrate 21 may be a structure similar to a diffuser (Diffuser), or the substrate 21 may be made of a transparent polymer material Or, the substrate 21 may also be a multilayer film material, or the substrate may also be made of glass, which is not limited herein.

The base 21 defines a plurality of reflective regions 21A on the inner side 211. When the reflective sheet body 2 is fixedly disposed above the light source holder 1, the inner side surface 211 of the substrate 21 faces the light source holder 1, and each reflection area 21A is correspondingly located directly above each reflection cup structure 12, and each reflection area The center of 21A corresponds to the position above the center of the top light-emitting surface 13A of the light-emitting unit 13. More specifically, the center of each reflection area 21A and the center of the top light-emitting surface 13A of the light-emitting unit 13 are on the same axis.

In practical applications, each reflective area 21A corresponds to an orthographic area corresponding to the orthographic projection of each reflective cup structure 12 in the direction of the reflective sheet body 2, or the reflective area 21A may be equal to the reflective sheet of each reflective cup structure 12 The orthographic projection area of the orthographic projection of the direction of the body 2; the center of each reflective area 21A is within the orthographic projection area of the orthographic projection of the respective light emitting unit 13 in the direction of the reflective sheet body 2.

A plurality of reflective layer structures 22 are formed on the inner surface 211 of the substrate 21, and the plurality of reflective layer structures 22 are distributed in the plurality of reflective regions 21A. Each reflective layer structure 22 can reflect the light beam emitted by the light source holder 1, At least a part of the light beam reflected by the reflective layered structure 22 will return to the reflective cavity 121, and after being reflected by the reflective cavity 121, be emitted toward the reflective sheet body 2 again.

As shown in FIGS. 6 and 7, the distribution method of the plurality of reflective layered structures 22 in each reflective area 21A is: the more adjacent to the reflective areas 21A in the plurality of reflective layered structures 22 in each reflective area 21A The denser the centers are, the denser the edges of the reflection area 21A are, and the denser the corners of the reflection area 21A are. More specifically, as shown in FIG. 7, it is shown as a top view of a single reflective area 21A. A plurality of the reflective layered structures 22 in the single reflective area 21A are shown in the center circle area in the figure In A, in the four circle areas B near the four corners of the reflection area 21A shown in the figure, and in the four strip areas C shown in the figure, they are all densely arranged, and the light emitting units 13 The light beams emitted toward the reflective area 21A will be reflected back to the reflective cup structure 12 in large amounts at the positions of the central circle area A, the four circle areas B, and the four elongated areas C.

Please refer to FIG. 4 and FIG. 7 together. The central circle area A shown in FIG. 7 corresponds to directly above the light-emitting unit 13 of the reflective cup structure 12, and the four circle areas B shown in FIG. 7 are Corresponding to the four corners of the reflective cup structure 12, and the four elongated regions C shown in FIG. 7 are corresponding to the boundary position of the reflective cup structure 12; as shown in FIG. 4, in other words, each other The reflection sheet 2 directly above the boundary position where the two adjacent reflective cup structures 12 are connected to each other is formed with a relatively dense reflective layered structure 22, and the corners of the two adjacent reflective cup structures 12 adjacent to each other are connected to each other The reflective sheet body 2 directly above the position corresponds to a relatively dense reflective layer structure 22 formed.

As described above, by making the multiple reflective layered structures 22 located in the single reflective area 21A directly above the light emitting unit 13, directly above the four edges of the reflective cup structure 12 and the four sides of the reflective cup structure 12 The densely arranged design directly above the corners will make the light beam emitted by the light-emitting unit 13 through the reflective area 21A more uniform.

More specifically, if the plurality of reflective layer structures 22 of the reflective sheet body 2 are not designed according to the foregoing distribution state, the light beam emitted by the light-emitting unit 13 is reflected by the user when the beam is emitted outward through the reflective sheet body 2 One side of the outer surface 212 of the sheet body 2 will easily see the brightness directly above each light-emitting unit 13, the brightness at the boundary of two adjacent reflective cup structures 12, the two adjacent reflective cups The brightness at the corners of the structure 12 is significantly stronger than other areas. Conversely, if the plurality of reflective layered structures 22 of the reflective sheet body 2 are arranged according to the foregoing distribution state, the user will see the reflective sheet when viewing the reflective sheet body 2 on the side of the outer surface 212 of the reflective sheet body 2 The brightness of each area of the volume 2 is almost bright.

As mentioned above, in the embodiment in which each light-emitting unit 13 is not provided with the aforementioned semi-reflective member 132, when the user views the reflective sheet body 2 on the side of the outer surface 212 of the reflective sheet body 2, the user will more clearly see the light The brightness of the area directly above the unit 13 and the brightness of the four junctions of the two adjacent reflective cup structures 12 are significantly higher than those of other areas; where the brightness of the area directly above the light-emitting unit 13 is higher because of light emission Due to the directivity of the unit 13, the brightness at the four junctions of the two adjacent reflective cup structures 12 is higher because the light beams emitted by the light-emitting unit 13 in the two reflective cup structures 12 will simultaneously illuminate the four junctions Office.

As shown in FIG. 8, in a specific implementation, each reflective layered structure 22 may be formed on the substrate 21 by ink printing, vapor deposition, etc., and each reflective layered structure 22 may include titanium oxide particles, oxidized The resin of high-reflectivity particles such as aluminum particles and silicon oxide particles, or each reflective layered structure 22 may itself be composed of metal particles. The outer diameter OD (as shown in FIG. 6) of each reflective layered structure 22 may be between 1 micrometer (um) and 500 micrometers (um), preferably, the outer diameter OD of each reflective layered structure 22 may be between 30 microns (um) to 100 microns (um). The thickness D (as shown in FIG. 2) of each reflective layered structure 22 may be between 0.05 microns (um) and 20 microns (um).

According to the above, the reflective sheet body 2 is provided above the light source base 1, and the reflective sheet body 2 is provided with a plurality of reflective layer structures 22 on the wide side of the light source base 1, and a single reflection is arranged The design of a plurality of reflective layered structures 22 in the area 21A near the center position of the reflective area 21A, the corner position near the reflective area 21A and the edge position near the reflective area 21A will allow the light emitting unit 13 to emit light from the top Most of the light beams emitted by the surface 13A will be reflected by the reflective layered structure 22 to the reflection cavity 121, and most of the light beams emitted by the light-emitting unit 13 from the ring light-emitting surface 13B can be emitted outward from the outer surface 212 through the substrate 21, However, a small part of the light beam emitted by the light-emitting unit 13 from the ring light-emitting surface 13B is reflected by the reflection layer structure 22 to the reflection cavity 121. In this way, the uniformity of the light emitted by the light source base 1 through the reflective sheet 2 can be greatly improved.

Please refer to FIG. 9 to FIG. 11 together. FIG. 9 shows a front view of a side surface of the reflector body of the second embodiment of the direct-type backlight device of the present invention, and FIG. 10 shows the first view of the direct-type backlight device of the present invention. A schematic perspective view of the reflective sheet body of the second embodiment. FIG. 11 shows a front view of a single reflective area of the reflective sheet body of the second embodiment of the direct-type backlight device of the present invention. As shown in FIG. 9 and FIG. 10, the biggest difference between this embodiment and the previous embodiment is that one of the wide sides 1312 of the reflective sheet body 2 is formed with a reflective layer 23, which can reflect the light source holder 1. The emitted light beam. The reflective layer 23 includes a plurality of through holes 231, each of the through holes 231 penetrates the reflective layer 23, and a portion of the substrate 21 can be exposed through the plurality of through holes 231. The plurality of through holes 231 are distributed in the plurality of reflective regions 21A.

As shown in FIG. 10, which is shown as a top view of a single reflective area 21A, the plurality of perforations 231 in each reflective area 21A are denserly arranged farther from the center of the reflective area 21A, and further away from the reflective area The edges of 21A are arranged denser, and the corners farther away from the reflection area 21A are arranged denser. A plurality of perforations 231 are shown in the central circle area A shown in FIG. 10, in the four circle areas B near the four corners of the reflection area 21A shown in the figure, and four long bars shown in the figure The areas C are all densely arranged, and the light beams emitted by the light-emitting unit 13 to the reflective area 21A will be largely reflected back at the positions of the central circle area A, the four circle areas B, and the four elongated areas C杯结构12. 12. Cup structure 12.

As described above, by making the plurality of perforations 231 located in a single reflective area 21A, directly above the light emitting unit 13, directly above the four edges of the reflective cup structure 12 and the four corners of the reflective cup structure 12 The densely arranged design directly above the location will make the light beam emitted by the light emitting unit 13 through the reflective area 21A more uniform.

As shown in FIG. 11, in practical applications, the reflective layer 23 may be formed on a wide side of the substrate 21 by printing, vapor deposition, etc., and related equipment for printing, vapor deposition is directly on the perforation At the position 231, printing and vapor deposition operations are not performed. That is, the through hole 231 is the position where the reflective layer 23 is not provided on the substrate 21.

Please refer to FIG. 12 and FIG. 13 together. FIG. 12 shows a partial side view of a third embodiment of the direct-type backlight device of the present invention, and FIG. 13 shows a partial side view of the fourth embodiment of the direct-type backlight device of the present invention. Schematic. The embodiment shown in FIG. 12 is most different from the foregoing first embodiment in that a plurality of reflective layer structures 22 are provided on the outer side 212 of the substrate 21. The embodiment shown in FIG. 13 differs from the foregoing first embodiment in that the inner side 211 and the outer side 212 of the substrate 21 are both provided with a plurality of reflective layer structures 22. In the embodiments of FIGS. 12 and 13, the light beam emitted by the light-emitting unit 13 can pass through the substrate 21, specifically, the transmittance of the light beam emitted by the light-emitting unit 13 through the substrate 21 can be greater than 80%. In a specific application, the distribution of the reflective layered structure 22 on the inner side 211 of the substrate 21 may be different from the distribution of the reflective layered structure 22 on the outer side 212 of the substrate 21.

Please refer to FIG. 14 and FIG. 15 together. FIG. 14 shows a partial side schematic view of the fifth embodiment of the direct-type backlight device of the original creation, and FIG. 15 shows a partial side view of the sixth embodiment of the direct-type backlight device of the original creation. Schematic. The biggest difference between the embodiment shown in FIG. 14 and the foregoing second embodiment is that the reflective layer 23 is provided on the outer side 212 of the substrate 21. The biggest difference between the embodiment shown in FIG. 15 and the aforementioned second embodiment is that both the inner side 211 and the outer side 212 of the substrate 21 are provided with a reflective layer 23. In the embodiments of FIGS. 14 and 15, the light beam emitted by the light-emitting unit 13 will be able to pass through the substrate 21, specifically, the transmittance of the light beam emitted by the light-emitting unit 13 through the substrate 21 may be greater than 80%. In a specific application, the distribution of the reflective layered structure 22 on the inner side 211 of the substrate 21 may be different from the distribution of the reflective layered structure 22 on the outer side 212 of the substrate 21.

The above is only the preferred and feasible embodiment of this creation, and does not limit the patent scope of this creation. Therefore, all equivalent technical changes made by using this creation description and graphic content are included in the protection scope of this creation. .

100: direct type backlight device 1: light source seat 11: Circuit board 12: Reflecting cup structure 121: reflective cavity 122: reflective surface 123: Arc section 124: container 13: Light emitting unit 13A: Top light emitting surface 13B: Ring light emitting surface 131: Light emitting diode 1311: top surface 1312: Side 132: Semi-reflective parts 133: Translucent body 134: adapter board 2: reflective sheet 21: substrate 211: Inner side 212: Outer side 21A: reflective area 22: reflective layered structure 23: reflective layer 231: Piercing A: Central circle area B: Circle area C: Long area D: thickness G: gap P: distance H: height OD: outer diameter W: width Q: Location

FIG. 1 shows a schematic side view of a first embodiment of a direct-type backlight device of the present invention.

FIG. 2 shows a schematic side view of a reflective cup structure, a light emitting unit, and a partial reflective sheet body of the first embodiment of the direct-type backlight device of the present invention.

FIG. 3 shows a schematic top view of the reflective cup structure of the first embodiment of the direct-lit backlight device of the present invention.

FIG. 4 is a partially enlarged schematic diagram of FIG. 3.

FIG. 5 shows a schematic perspective view of a single light-emitting unit of the first embodiment of the direct-type backlight device of the present invention.

FIG. 6 shows a front view of one side of the reflective sheet body of the first embodiment of the direct-type backlight device of the present invention.

7 shows a front view of a single reflection area of the reflection sheet body of the first embodiment of the direct-type backlight device of the present invention.

FIG. 8 shows a perspective schematic view of the reflective sheet body of the first embodiment of the direct-type backlight device of the present invention.

FIG. 9 shows a front view of a side surface of the reflective sheet body of the second embodiment of the direct-type backlight device of the present invention.

FIG. 10 is a schematic perspective view of a reflective sheet of a second embodiment of a direct-type backlight device of the present invention.

FIG. 11 shows a front view of a single reflection area of the reflection sheet body of the second embodiment of the direct-type backlight device of the present invention.

FIG. 12 shows a schematic side view of a third embodiment of the direct-type backlight device of the present invention.

FIG. 13 shows a schematic side view of the fourth embodiment of the direct-type backlight device of the present invention.

FIG. 14 shows a schematic side view of a fifth embodiment of the direct-type backlight device of the present invention.

FIG. 15 shows a schematic side view of the sixth embodiment of the direct-type backlight device of the present invention.

1: light source seat

11: Circuit board

12: Reflecting cup structure

121: reflective cavity

122: reflective surface

123: Arc section

124: container

13: Light emitting unit

13A: Top light emitting surface

13B: Ring light emitting surface

131: Light emitting diode

132: Semi-reflective parts

133: Translucent body

2: reflective sheet

21: substrate

211: Inner side

212: Outer side

22: reflective layered structure

D: thickness

G: gap

P: distance

Claims (10)

A direct type backlight device, including: A light source holder, which contains: A circuit board; A plurality of reflective cup structures are fixedly arranged on one side of the circuit board, and each of the reflective cup structures is concavely formed on a side opposite to the circuit board to form a reflective cavity; A plurality of light emitting units, 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; and A reflective sheet body, which defines a plurality of reflective areas, the reflective sheet body is disposed above the light source holder, each of the reflective areas is located directly above each of the reflective cup structures, and each of the reflective areas The center of is located above the center of the light-emitting unit, and the reflective sheet body includes: A substrate A plurality of reflective layered structures are formed on a wide side of the substrate, and the plurality of reflective layered structures are distributed in the plurality of reflective regions, and each of the reflective layered structures can reflect the light source Light beams emitted by the pedestal; the plurality of reflective layered structures in each of the reflective areas are arranged denser as they are closer to the center of the reflective area, and as densely arranged as possible as they are closer to the edges of the reflective area , The closer to the corners of the reflective area the denser the arrangement; 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 part of the light beams emitted by the corresponding light-emitting unit. The direct type backlight device according to claim 1, wherein a gap is formed between one side of the reflective cup structure of the light source holder in which the reflective cavity is formed and the reflective sheet body, the The distance of the gap is not more than 2 mm (mm). The direct type backlight device according to claim 1, wherein the two wide side surfaces of the substrate opposite to each other are formed with the plurality of layered reflective structures, and the light beam emitted by the light source holder passes through the substrate The penetration rate is greater than 80%. The direct type backlight device according to claim 1, wherein each of the reflection areas falls within a projection area of the orthographic projection of the corresponding reflection cup structure in the direction of the reflection sheet body. The direct type backlight device according to claim 1, wherein each of the reflective layered structures is circular, and the outer diameter of each of the reflective layered structures is between 1 micrometer (um) and 500 micrometers (um); The thickness of each reflective layered structure is between 0.05 micrometers (um) and 20 micrometers (um); the thickness of the reflective sheet is between 0.1 millimeters (mm) and 2 millimeters (mm). A direct type backlight device, including: A light source holder, which contains: A circuit board; A plurality of reflective cup structures are fixedly arranged on one side of the circuit board, and each of the reflective cup structures is concavely formed on a side opposite to the circuit board to form a reflective cavity; A plurality of light emitting units, 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; and A reflective sheet body, which defines a plurality of reflective areas, the reflective sheet body is disposed above the light source holder, each of the reflective areas is located directly above each of the reflective cup structures, and each of the reflective areas The center of is located above the center of the light-emitting unit, and the reflective sheet body includes: A substrate A reflective layer formed on a wide side of the substrate, the reflective layer can reflect the light beam emitted by the light source holder; the reflective layer includes a plurality of through holes, each of the through holes penetrates the reflective layer, A part of the substrate can be exposed through a plurality of the perforations; the plurality of the perforations are distributed in the plurality of reflection areas; the more the plurality of the perforations in each of the reflection areas, the farther away from The denser the centers of the reflective areas are, the denser the edges of the reflective areas are, and the denser the corners of the reflective areas are; 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 part of the light beams emitted by the corresponding light-emitting unit. The direct type backlight device according to claim 6, wherein a gap is formed between one side of the reflective cup structure of the light source holder in which the reflective cavity is formed and the reflective sheet body, the The distance of the gap is not more than 2 mm (mm). The direct type backlight device according to claim 6, wherein the reflective layer is formed on two wide sides of the substrate opposite to each other, and the transmittance of the light beam emitted by the light source holder through the substrate More than 80%. The direct type backlight device according to claim 6, wherein each of the reflection areas falls within a projection area of the orthographic projection of the corresponding reflection cup structure in the direction of the reflection sheet body. The direct type backlight device according to claim 6, wherein each of the perforations is circular, and the outer diameter of each of the perforations is between 1 micrometer (um) and 500 micrometers (um); each of the reflective layers The thickness of the structure is between 0.05 micrometers (um) and 20 micrometers (um); the thickness of the reflective sheet is between 0.1 millimeters (mm) and 2 millimeters (mm).

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