CN210803926U - Direct type backlight module and display device - Google Patents
Direct type backlight module and display device Download PDFInfo
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- CN210803926U CN210803926U CN201921779109.4U CN201921779109U CN210803926U CN 210803926 U CN210803926 U CN 210803926U CN 201921779109 U CN201921779109 U CN 201921779109U CN 210803926 U CN210803926 U CN 210803926U
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Abstract
The utility model discloses a straight following formula backlight unit. The direct type backlight module comprises a circuit board, a quantum dot film and an auxiliary reflection structure which are sequentially stacked; the circuit board is provided with a plurality of light-emitting units which are arranged in an array structure; the light emitting surface of the light emitting unit deviates from the quantum dot film; the auxiliary reflection structure comprises a base material and a plurality of auxiliary reflection units formed on the base material; the auxiliary reflection units are arranged in one-to-one correspondence with the light-emitting units; light emitted from the light emitting unit is reflected by the auxiliary reflection structure and then enters the quantum dot film. The utility model discloses technical scheme can fully reduce the OD value to under the prerequisite that does not influence backlight unit's optical property, realize the purpose of backlight unit thinization.
Description
Technical Field
The utility model relates to a display technology especially relates to a straight following formula backlight unit and display device.
Background
With the development of science and technology, liquid crystal display devices enter thousands of households, and bring convenience to the lives of people. The liquid crystal display device comprises a display module and a backlight module. The display module does not emit light, and images are normally displayed by light provided by the backlight module.
At present, the thickness of the display device becomes an important index for evaluating the quality of the liquid crystal display device. One important way to reduce the thickness of the display device is to reduce the thickness of the backlight module. However, the OD (Optical Distance) value of the conventional backlight module, especially the direct-type backlight module, is generally larger. Here, the OD value refers to a distance between the light emitting unit and the optical film closest thereto in the light transmission direction. This is because the conventional direct type backlight module includes a light emitting unit and a quantum dot film disposed on a light emitting side of the light emitting unit. The light emitted by the light emitting unit propagates in the form of a light beam. The light beam is slightly divergent and irradiates the quantum dot film to form a light spot on the quantum dot film. Only when the OD value is large enough, light spots formed by light emitted by all the light emitting units on the light incident surface of the quantum dot film can be fused and cover the whole quantum dot film. If the OD value is too small, the light emitted from the light-emitting unit forms independent light spots on the light incident surface of the quantum dot film, and the light spots cannot be fused and even cannot cover the whole quantum dot film. Obviously, this affects the optical performance of the backlight module. Therefore, how to reduce the OD value of the backlight module is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a straight following formula backlight unit can reduce backlight unit's OD value for display device's thickness reduces.
In a first aspect, the present invention provides a direct type backlight module, which includes a circuit board and a quantum dot film stacked in sequence;
the circuit board is provided with a plurality of light-emitting units which are arranged in an array structure;
also includes an auxiliary reflective structure;
the auxiliary reflection structure is positioned on one side of the circuit board, which is far away from the quantum dot film; the light emitting surface of the light emitting unit faces the auxiliary reflecting structure;
the auxiliary reflecting structure comprises a base material and a plurality of auxiliary reflecting units fixedly connected with the base material; the auxiliary reflection units are arranged in one-to-one correspondence with the light emitting units; and light emitted from the light emitting unit is reflected by the auxiliary reflection structure and then enters the quantum dot film.
Further, the auxiliary reflection unit includes at least two first reflection assemblies; the first reflection assembly is positioned on the surface of the substrate close to the light-emitting unit;
the first reflection assemblies are dispersed around the vertical projection of the corresponding light-emitting units on the substrate, and the reflection surfaces of the first reflection assemblies are positioned on the transmission paths of the light emitted by the corresponding light-emitting units.
Further, all the first reflecting components in the auxiliary reflecting units are connected into a whole;
the vertical projection of the first reflecting assemblies connected into a whole on the base material is annular.
Further, the first reflection assembly includes a first reflection part and a second reflection part;
the first reflecting part and the second reflecting part are fixedly connected;
the first reflection assembly is cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained section is L-shaped.
Further, in a direction from the substrate to the light emitting unit, the first reflective component is sectioned by a plane parallel to the substrate, and an area of a resulting section is gradually reduced.
Further, the auxiliary reflection unit further comprises at least one second reflection assembly;
the first reflection assembly is positioned on the surface of the substrate close to the light-emitting unit and in an area surrounded by the first reflection assembly in the auxiliary reflection unit to which the first reflection assembly belongs; and the second reflecting assembly is cut by a plane parallel to the light-emitting surface of the backlight module along the direction from the substrate to the light-emitting unit, and the areas of the obtained sections are gradually reduced.
Further, the auxiliary reflection structure further includes a reflection film between the auxiliary reflection unit and the substrate.
Furthermore, the auxiliary reflection unit is a hemispherical reflection piece, and the reflection piece is fixed inside the base material;
the opening of the reflector faces the light emitting unit; and the vertical projection of the light-emitting unit on the substrate is positioned in the opening of the reflecting piece.
Further, the circuit board further comprises a transparent substrate and connecting wires;
the transparent substrate is internally provided with a hollow cavity, and the connecting lead and the light-emitting unit are packaged in the hollow cavity.
In a second aspect, the present invention further provides a display device, including the present invention provides an arbitrary direct type backlight module.
The utility model arranges the auxiliary reflection structure in the direct type backlight module, and the auxiliary reflection structure is positioned at one side of the circuit board deviating from the quantum dot film; the light-emitting surface of the light-emitting unit faces the auxiliary reflection structure; the auxiliary reflecting structure comprises a base material and a plurality of auxiliary reflecting units fixedly connected with the base material; the auxiliary reflection units are arranged in one-to-one correspondence with the light-emitting units; the light emitted from the light-emitting unit is reflected by the auxiliary reflection structure and then enters the quantum dot film, so that the problem that the thickness of the direct type backlight module is too large due to too large OD value of the existing direct type backlight module is solved, and the aim of thinning the backlight module is fulfilled on the premise of not influencing the optical performance of the backlight module.
Drawings
Fig. 1 is a schematic structural view of a direct type backlight module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a direct type backlight module according to an embodiment of the present invention;
FIG. 3 is a schematic view of a partial structure of the direct-type backlight module shown in FIG. 1;
fig. 4 is a schematic top view of an auxiliary reflection unit according to the present invention;
fig. 5 is a schematic top view of another auxiliary reflection unit provided by the present invention;
FIG. 6 is a schematic structural diagram of the first reflection assembly shown in FIG. 3;
fig. 7 is a schematic structural diagram of another first reflection assembly provided by the present invention;
fig. 8 is an optical path diagram of another direct type backlight module according to an embodiment of the present invention;
FIG. 9 is another optical path diagram of the direct type backlight module provided in FIG. 8;
fig. 10 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention;
fig. 11 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention;
fig. 12 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention;
fig. 13 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention;
fig. 14 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of another circuit board according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of the present invention for the specific embodiments, structures, features and effects of the direct type backlight module and the display device according to the present invention.
Fig. 1 is a schematic structural view of a direct type backlight module according to an embodiment of the present invention. Referring to fig. 1, the direct type backlight module includes: the circuit board 20 and the quantum dot film 10 are sequentially stacked; a plurality of light emitting units 21 arranged in an array structure are arranged on the circuit board 20; further comprising an auxiliary reflective structure 30; the auxiliary reflection structure 30 is positioned on the side of the circuit board 20 away from the quantum dot film 10; the light emitting surface of the light emitting unit 21 faces the auxiliary reflective structure 30; the auxiliary reflective structure 30 includes a substrate 31 and a plurality of auxiliary reflective units 32 fixedly connected to the substrate 31 (for example, the auxiliary reflective structure 30 in fig. 1 includes four auxiliary reflective units 32); the auxiliary reflection units 32 are arranged in one-to-one correspondence with the light emitting units 21; light emitted from the light emitting unit 21 is reflected by the auxiliary reflection structure 30 and then enters the quantum dot thin film 10.
Fig. 2 is a schematic diagram of a direct type backlight module according to an embodiment of the present invention. Referring to fig. 2, the light emitting unit 21-1 does not correspond to the auxiliary reflective structure 30, and the light emitting unit 21-2 corresponds to the auxiliary reflective structure 30. Comparing the propagation path of the light emitted from the light emitting unit 21-1 with the propagation path of the light emitted from the light emitting unit 21-2, the auxiliary reflective structure 30 can fold the propagation path of the light emitted from the light emitting unit 21-2 in a narrow space, so that if light spots with the same size are formed on the quantum dot film, the OD value can be reduced from h1 to h2 by adopting the scheme that the light emitting unit 21-2 corresponds to the auxiliary reflective structure 30, and the purpose of thinning the backlight module is achieved on the premise that the optical performance of the backlight module is not affected.
In practical implementation, the specific structure of the auxiliary reflection unit 32 is various, and the application does not limit this. A typical example will be described in detail below.
Fig. 3 is a partial schematic structural view of the direct type backlight module provided in fig. 1. Alternatively, referring to fig. 1 and 3, the auxiliary reflection unit 32 includes at least two first reflection members 321 (exemplarily, the auxiliary reflection unit 32 includes two first reflection members 321 in fig. 3); the first reflection assembly 321 is located on the surface of the substrate 31 close to the light emitting unit 21; the first reflection assemblies 321 are dispersed around the vertical projection of the corresponding light emitting units 21 on the substrate 31, and the reflection surfaces of the first reflection assemblies 321 are located on the transmission paths of the light emitted by the corresponding light emitting units 21. In this way, the first reflective component 321 can be utilized to "fold" the propagation path of the light emitted from the light-emitting unit 21, so as to reduce the OD value without affecting the optical performance of the backlight module, thereby achieving the purpose of thinning the backlight module.
Optionally, fig. 4 is a schematic top view of the auxiliary reflection unit provided by the present invention. Fig. 5 is a schematic top view of another auxiliary reflection unit according to the present invention. In fig. 4, there are four first reflective members 321, and the four first reflective members 321 are dispersed around the corresponding light emitting units 21. In fig. 5, all the first reflecting members 321 in the auxiliary reflecting unit 32 are connected as one body, compared with fig. 4; the vertical projection of the integrally connected first reflecting member 321 on the substrate 31 is annular.
Compared with the technical scheme in fig. 4, the first reflection assemblies 321 in fig. 5 are connected to form a whole by mainly reflecting the light beams emitted by the light emitting unit 21 to the quantum dot thin film 10, so that the light beams emitted by the light emitting unit 21 and transmitted in all directions can be effectively reflected, and the utilization rate of the light rays emitted by the light emitting unit 21 can be improved.
Fig. 6 is a schematic structural diagram of the first reflection assembly in fig. 3. With continued reference to fig. 3 and 6, the first reflection assembly 321 includes a first reflection part 321a and a second reflection part 321 b; the first reflection portion 321a and the second reflection portion 321b are fixedly connected; the first reflective element 321 is cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained cross section is L-shaped. So as to remove the light I emitted from the light emitting unit 211And light I2Can be made such that, in addition to reducing the OD value, the light I emerging from the light-emitting unit 21 can also be made to "fold" the propagation path2The light enters the region between the light emitting unit 21 and the quantum dot film 10 (i.e. the vertical projection of the light emitting unit 21 on the quantum dot film 10) through the second reflecting part 321b and the first reflecting part 321a, so as to achieve the purpose of eliminating the shadow above the light emitting unit 21.
Note that, in actual installation, optionally, with continuing reference to fig. 6, the first reflection portion 321a is provided including a transparent base 321a1 and a reflection film 321a2 covering the transparent base 321a 1. This allows the first reflecting portion 321a to have a light reflecting effect. While, as for the second reflection portion 321b, alternatively, as shown in fig. 6, the second reflection portion 321b includes only the transparent base material 321b 1. A reflection film 33 is provided between the auxiliary reflection unit 32 and the base material 31, and the reflection film 33 covers the entire base material 31. Fig. 7 is a schematic structural diagram of another first reflection assembly according to the present invention. Referring to fig. 7, the second reflection part 321b includes a transparent base 321b1 and a reflection film 321b2 covering the transparent base 321b 1. Both of the designs in fig. 6 and 7 can make the second reflection portion 321b have a light reflection effect. However, in practice, since there is a possibility that light emitted from the light emitting unit 21 may be reflected between two adjacent first reflecting members 321, the reflecting film 33 is provided between the first reflecting members 321 and the base material 31, and the reflecting film 33 covers the entire base material 31, so that the utilization rate of light emitted from the light emitting unit 21 can be further improved.
Fig. 8 is an optical path diagram of another direct type backlight module according to an embodiment of the present invention. Fig. 9 is another optical path diagram of the direct type backlight module provided in fig. 8. Referring to fig. 8 and 9, in the direct-type backlight module, the first reflective element 321 is cut by a plane parallel to the substrate along a direction from the substrate 31 to the light emitting unit 21, and the area of the obtained cross section is gradually reduced. So arranged that light I emitted from the light emitting unit 21 can be reflected by the first reflecting member1The propagation path of (a) is "folded" (as shown in fig. 8), reducing the OD value. Further, it is also possible to make the light ray I emitted from the light emitting unit 212After being reflected by the first reflection assembly 321, the light is incident on the region between the light emitting unit 21 and the quantum dot film 10 (i.e. in the vertical projection of the light emitting unit 21 on the quantum dot film 10) (as shown in fig. 9), so as to achieve the purpose of eliminating the shadow above the light emitting unit 21.
For example, in fig. 8 and 9, the first reflective element 321 is arranged to be cut by a plane perpendicular to the light exit surface of the backlight module, and the obtained cross section is a triangle, which is only a specific example of the present application and is not a limitation to the present application. Fig. 10 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present invention. Optionally, referring to fig. 10, the first reflective element 321 may be further disposed to be cut by a plane perpendicular to the light exit surface of the backlight module, and the obtained cross section is a semicircle. In addition, the first reflective element 321 may be cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained cross section is trapezoidal.
It should be further noted that, with continuing reference to fig. 8-10, optionally, the auxiliary reflective structure 30 further includes a reflective film 33, and the reflective film 33 is located between the auxiliary reflective unit and the substrate 31, such that the reflective film 33 covers the entire substrate 31, and since there is a possibility that the light emitted from the light emitting unit 21 may be reflected to between two adjacent first reflective assemblies 321 in practice, the utilization rate of the light emitted from the light emitting unit 21 may be further improved.
On the basis of the above technical solutions, optionally, fig. 11 is a schematic structural diagram of another direct type backlight module provided in an embodiment of the present invention. Fig. 12 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention. Fig. 13 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention. Referring to fig. 11-13, the auxiliary reflective unit 32 further includes at least one second reflective member 322 (illustratively, in fig. 11-13, the auxiliary reflective unit 32 is shown to include only one second reflective member 322); the second reflective element 322 is located on the surface of the substrate 31 close to the light-emitting unit 21, and is located in the area surrounded by the first reflective elements 321 in the auxiliary reflective unit 32 to which it belongs; along the direction from the substrate 31 to the light emitting unit 21, the second reflective element 322 is cut by a plane parallel to the light emitting surface of the backlight module, and the area of the obtained cross section is gradually reduced. By adding the second reflection assembly 322, the light I emitted from the light emitting unit 21 and transmitted in the direction perpendicular to the substrate 31 can be transmitted3The light is fully utilized, and can be incident to the quantum dot film 10 after being reflected by the second reflecting component 322 and the first reflecting component 321 in sequence. This can improve the utilization rate of light emitted from the light emitting unit 21 and improve the luminance of a light spot formed on the quantum dot thin film 10.
For example, in fig. 11 and 12, the second reflective element 322 is disposed to be cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained cross-section is triangular, and in fig. 13, the second reflective element 322 is disposed to be cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained cross-section is semicircular. These are only a few specific examples provided herein and are not intended to be limiting of the present application. In practice, the second reflective element 322 may be cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained cross section is trapezoidal.
In addition, since there are a plurality of shapes of the first reflection element 321, and a plurality of shapes of the second reflection element 322, in practice, the shape of the second reflection element 322 and the shape of the first reflection element 321 may be arbitrarily combined, and the present application is not limited thereto. As shown in fig. 11-13, alternatively, the second reflective element 322 is cut by a plane perpendicular to the light-emitting surface of the backlight module to obtain a semicircular cross section, and the first reflective element 321 is cut by a plane perpendicular to the light-emitting surface of the backlight module to obtain a triangular cross section.
Further, if the second reflective element 322 and the first reflective element 321 are cut by a plane perpendicular to the light exit surface of the backlight module, and the obtained cross sections are both triangular, the specific shapes and/or sizes of the second reflective element 322 and the first reflective element 321 may be the same or different. Optionally, the cross section of the first reflective element 321 is an isosceles triangle, and the cross section of the second reflective element 322 is an equilateral triangle. Alternatively, the cross-section of the first reflective member 321 and the cross-section of the second reflective member 322 are both equilateral triangles.
In actual installation, based on the above technical solutions, the shadow above the light emitting unit 21 can be eliminated by adjusting the specific shapes, sizes and distances of the second reflecting member 322 and the first reflecting member 321.
Further, if the cross section of the first reflective element 321 and the cross section of the second reflective element 322 are semicircular, which is equivalent to making the bottom of the light emitting unit 21 into a fog surface, the first reflective element 321 and the second reflective element 322 may be made of the same material as AG particles in the polarizer.
Fig. 14 is a schematic structural view of another direct type backlight module according to an embodiment of the present invention. Alternatively, referring to fig. 14, the auxiliary reflection unit 32 may be a reflection member having a hemispherical shape, and the reflection member is fixed inside the substrate 31; the opening of the reflector faces the light emitting unit 21; and the perpendicular projection of the light emitting unit 21 on the substrate 31 is located within the opening of the reflector. With such an arrangement, besides the propagation path of the light emitted by the light emitting unit 21 can be "folded" and the OD value can be reduced, a part of the light emitted from the light emitting unit 21 can be reflected by the reflector and then incident into the region between the light emitting unit 21 and the quantum dot film 10 (i.e. the vertical projection of the light emitting unit 21 on the quantum dot film 10), so as to achieve the purpose of eliminating the shadow above the light emitting unit 21.
On the basis of the above technical solutions, the base material 31 may be a composite prism.
Fig. 15 is a schematic structural diagram of a circuit board according to an embodiment of the present invention. Fig. 16 is a schematic structural diagram of another circuit board according to an embodiment of the present invention. Referring to fig. 15 and 16, the circuit board 20 further includes a transparent substrate 22 and a connection wire 23. The transparent substrate 22 is provided therein with a hollow chamber 221, and the connecting wire 23 and the light emitting unit 21 are enclosed in the hollow chamber 221. The circuit board 20 employs the transparent substrate 22, which has a small absorption amount of light reflected by the auxiliary reflective structure 30 and a small influence on the backlight effect of the backlight module.
Comparing fig. 15 and fig. 16, in the circuit board of fig. 16, the transparent substrate 22 is hollowed out at a portion where the cavity 221 is not provided. This can further reduce the amount of absorption of light reflected by the auxiliary reflective structure 30, and reduce the influence on the backlight effect of the backlight module as a whole.
Further, ITO is selected as the material of the connection wire 23. Since the ITO itself is a transparent material, it can reduce the absorption amount of the connecting wires 23 to the light reflected by the auxiliary reflective structure 30, and reduce the influence on the overall backlight effect of the backlight module.
Optionally, the light emitting source 21 is a mini LED. The use of the mini LED is beneficial to further realizing the thinning of the backlight module.
After light emitted by the light emitting unit 21 is incident on the quantum dot film 10, the quantum dot is excited to convert the light into white light. Because the luminous viewing angle of the quantum dots is usually larger than that of the luminous unit 21, the display effect of the backlight module is improved, and the OD value of the backlight module is further reduced.
On the basis of the above technical solutions, optionally, the backlight module further includes a first optical film group; the first optical module group is located between the quantum dot film 10 and the circuit board 20. The light to be incident on the quantum dot thin film 10 can be further adjusted using the first optical sheet to improve uniformity and brightness of the light.
Optionally, the first optical film set includes a diffuser film. This arrangement allows many refractions, reflections, and scatters of light incident thereon to maintain uniformity of in-plane brightness.
Alternatively, it may be further provided that the first optical film group includes a prism sheet or the like.
Optionally, the backlight module further comprises a second optical film group; the second optical module group is located on the side of the quantum dot film 10 facing away from the circuit board 20. The light emitted from the quantum dot film 10 can be further integrated and adjusted by the second optical film to improve the uniformity and brightness of the light.
Optionally, the second optical film group includes a prism sheet. The arrangement can lead the light emitted by the quantum dot film to be emitted in a concentrated way within a certain angle, thereby improving the brightness within the visual field range.
In view of this, the embodiment of the present invention further provides a display device. Fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 17, the display device includes any one of the direct type backlight module 100 and the display module 200 opposite to the direct type backlight module 100.
Because the embodiment of the utility model provides a display device includes the utility model provides an arbitrary straight following formula backlight unit, it has the same or corresponding beneficial effect of straight following formula backlight unit that it included, and it is no longer repeated here.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.
Claims (10)
1. A direct type backlight module comprises a circuit board and a quantum dot film which are sequentially stacked;
the circuit board is provided with a plurality of light-emitting units which are arranged in an array structure;
the LED lamp is characterized by also comprising an auxiliary reflecting structure;
the auxiliary reflection structure is positioned on one side of the circuit board, which is far away from the quantum dot film; the light emitting surface of the light emitting unit faces the auxiliary reflecting structure;
the auxiliary reflecting structure comprises a base material and a plurality of auxiliary reflecting units fixedly connected with the base material; the auxiliary reflection units are arranged in one-to-one correspondence with the light emitting units; and light emitted from the light emitting unit is reflected by the auxiliary reflection structure and then enters the quantum dot film.
2. The direct-type backlight module according to claim 1, wherein the auxiliary reflective unit comprises at least two first reflective members; the first reflection assembly is positioned on the surface of the substrate close to the light-emitting unit;
the first reflection assemblies are dispersed around the vertical projection of the corresponding light-emitting units on the substrate, and the reflection surfaces of the first reflection assemblies are positioned on the transmission paths of the light emitted by the corresponding light-emitting units.
3. The direct type backlight module according to claim 2,
all the first reflecting components in the auxiliary reflecting units are connected into a whole;
the vertical projection of the first reflecting assemblies connected into a whole on the base material is annular.
4. The direct-type backlight module as claimed in claim 2, wherein the first reflective member comprises a first reflective portion and a second reflective portion;
the first reflecting part and the second reflecting part are fixedly connected;
the first reflection assembly is cut by a plane perpendicular to the light-emitting surface of the backlight module, and the obtained section is L-shaped.
5. The direct-type backlight module according to claim 2, wherein the first reflective member is cut by a plane parallel to the substrate in a direction from the substrate to the light-emitting unit, and the area of the obtained cross section is gradually reduced.
6. The direct type backlight module according to claim 2, wherein the auxiliary reflection unit further comprises at least one second reflection member;
the second reflection assembly is positioned on the surface of the substrate close to the light-emitting unit and in an area surrounded by the first reflection assembly in the auxiliary reflection unit to which the second reflection assembly belongs; and the second reflecting assembly is cut by a plane parallel to the light-emitting surface of the backlight module along the direction from the substrate to the light-emitting unit, and the areas of the obtained sections are gradually reduced.
7. The direct type backlight module according to any one of claims 1 to 6, wherein the auxiliary reflective structure further comprises a reflective film between the auxiliary reflective unit and the substrate.
8. The direct-type backlight module as claimed in claim 1, wherein the auxiliary reflective unit is a hemispherical reflective member fixed inside the substrate;
the opening of the reflector faces the light emitting unit; and the vertical projection of the light-emitting unit on the substrate is positioned in the opening of the reflecting piece.
9. The direct type backlight module according to claim 1, wherein the circuit board further comprises a transparent substrate and connecting wires;
the transparent substrate is internally provided with a hollow cavity, and the connecting lead and the light-emitting unit are packaged in the hollow cavity.
10. A display device comprising the direct type backlight module according to any one of claims 1 to 9.
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| CN201921779109.4U CN210803926U (en) | 2019-10-22 | 2019-10-22 | Direct type backlight module and display device |
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| CN201921779109.4U CN210803926U (en) | 2019-10-22 | 2019-10-22 | Direct type backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113936546A (en) * | 2021-11-01 | 2022-01-14 | 联想(北京)有限公司 | Backlight module, manufacturing method thereof and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113936546A (en) * | 2021-11-01 | 2022-01-14 | 联想(北京)有限公司 | Backlight module, manufacturing method thereof and electronic equipment |
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