CN215769109U - Backlight module - Google Patents
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- CN215769109U CN215769109U CN202122008337.5U CN202122008337U CN215769109U CN 215769109 U CN215769109 U CN 215769109U CN 202122008337 U CN202122008337 U CN 202122008337U CN 215769109 U CN215769109 U CN 215769109U
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Abstract
The utility model provides a backlight module, which comprises a light guide plate, a light source, an upper prism sheet and a lower prism sheet. The light guide plate is provided with a light incident surface and a light emergent surface. The light incident surface is connected with the light emergent surface. The light source is arranged on one side of the light incident surface of the light guide plate. The upper prism sheet is arranged on one side of the light emergent surface of the light guide plate. The upper prism sheet comprises an upper substrate and a plurality of first prism microstructures. The first prism microstructure has an isosceles triangle cross section and an apex angle falling within a range of 80 to 90 degrees. The lower prism sheet is arranged between the light guide plate and the upper prism sheet. The lower prism sheet comprises a lower substrate and a plurality of second prism microstructures. The cross section of the second prism microstructure is an isosceles triangle, and the vertex angle of the second prism microstructure is within the range of 100-130 degrees. The light-emitting light shape of the backlight module provided by the utility model has better light concentration.
Description
Technical Field
The present invention relates to an optical module, and more particularly, to a backlight module.
Background
In the structure of the side-in type backlight module, besides the light source and the light guide plate, an optical film is required to improve the intensity of forward light emission. Recently, the demand for thinning of the display is increasing, and the reduction of the number of films is the most important development direction for thinning, and a high brightness module using two prism sheets will be the future development trend.
However, in the high-brightness structure where the light guide plate is combined with two prism sheets having the same prism structure, the emergent light is dispersed, and the viewing angle position of the maximum emergent brightness is also shifted, resulting in a decrease in energy of the positive viewing angle.
The background section is only used to help the understanding of the present invention, and therefore the disclosure in the background section may include some known techniques which are not known to those skilled in the art. The statements in the "background" section do not represent that matter or the problems which may be solved by one or more embodiments of the present invention, but are known or appreciated by those skilled in the art before filing the present application.
SUMMERY OF THE UTILITY MODEL
The utility model provides a backlight module, and the light emitting form of the backlight module has better light concentration.
An embodiment of the present invention provides a backlight module, which includes a light guide plate, a light source, an upper prism sheet, and a lower prism sheet. The light guide plate is provided with a light incident surface and a light emergent surface. The light incident surface is connected with the light emergent surface. The light source is arranged on one side of the light incident surface of the light guide plate and used for emitting a plurality of light beams. The upper prism sheet is arranged on one side of the light emergent surface of the light guide plate. The upper prism sheet comprises an upper substrate and a plurality of first prism microstructures. The upper substrate has a first surface and a second surface opposite to each other. The first prism microstructure is arranged on the first surface of the upper substrate. The first prism microstructure has an isosceles triangle cross section and an apex angle falling within a range of 80 to 90 degrees. The lower prism sheet is arranged between the light guide plate and the upper prism sheet. The lower prism sheet comprises a lower substrate and a plurality of second prism microstructures. The lower substrate is provided with a third surface and a fourth surface which are opposite. The third surface is disposed opposite the second surface. The second prism microstructure is arranged on the third surface of the lower substrate. The cross section of the second prism microstructure is an isosceles triangle, and the vertex angle of the second prism microstructure is within the range of 100-130 degrees.
Based on the above, in the backlight module of an embodiment of the utility model, since the vertex angle of the first prism microstructure is designed to fall within a range of 80 to 90 degrees, and the vertex angle of the second prism microstructure is designed to fall within a range of 100 to 130 degrees, the light-emitting type of the backlight module can be aligned in view angle and has better light concentration ratio under the condition of reducing the thickness of the module.
In order to make the aforementioned and other features and advantages of the utility model more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the utility model.
Fig. 2 is a schematic diagram of light emission pattern of the backlight module according to the first embodiment of the utility model.
Fig. 3 is a schematic cross-sectional view of a backlight module according to a second embodiment of the utility model.
Fig. 4 is a schematic cross-sectional view of a backlight module according to a third embodiment of the utility model.
Fig. 5 is a schematic cross-sectional view of a backlight module according to a fourth embodiment of the utility model.
FIG. 6 is a schematic cross-sectional view illustrating a lower prism sheet with an optical adhesive layer in a backlight module according to an embodiment of the utility model.
FIG. 7A is a schematic cross-sectional view illustrating a lower prism sheet with pyramid microstructures according to an embodiment of the utility model.
Fig. 7B is a schematic bottom view of the pyramid microstructure of fig. 7A.
Detailed Description
The foregoing and other features and advantages of the utility model will be apparent from the following, more particular description of preferred embodiments of the utility model, as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the utility model. Referring to fig. 1, the present embodiment provides a backlight module 10, which includes a light guide plate 100, a light source 200, an upper prism sheet 300, and a lower prism sheet 400.
In the embodiment, the material of the light guide plate 100 may be plastic, glass or other suitable materials, but the utility model is not limited thereto. The light guide plate 100 has a light incident surface 100S1 and a light emitting surface 100S 2. The light incident surface 100S1 is connected to the light emitting surface 100S 2.
In the present embodiment, the Light source 200 may be a Light-emitting diode (LED) or other suitable Light source. The light source 200 is disposed at one side of the light incident surface 100S1 of the light guide plate 100 and emits a plurality of light beams L toward the light incident surface 100S 1.
In the present embodiment, the upper prism sheet 300 is disposed at one side of the light emitting surface 100S2 of the light guide plate 100. The upper prism sheet 300 includes an upper substrate 302 and a plurality of first prism microstructures 304. The material of the upper substrate 302 may be polyethylene terephthalate (PET), Polycarbonate (PC), K-Resin (K-Resin, refractive index 1.65) or other suitable materials. The material of the first prism microstructure 304 may be ultraviolet curable glue (UV glue), K-Resin (K-Resin, refractive index 1.65) or other suitable high molecular polymer. In the present embodiment, the upper substrate 302 has a first surface 300S1 and a second surface 300S2, wherein the second surface 300S2 faces the light emitting surface 100S2, and the first surface 300S1 faces away from the light emitting surface 100S 2. The first prism microstructure 304 is disposed on the first surface 300S1 of the upper substrate 302. The first prism microstructure 304 extends along the extending direction E1, and on a plane perpendicular to the extending direction E1, the cross section of the first prism microstructure 304 is an isosceles triangle, and the vertex angle α 1 thereof falls within a range of 80 to 90 degrees. The extending direction E1 is, for example, parallel to the light incident surface 100S 1.
In the present embodiment, the lower prism sheet 400 is disposed between the light guide plate 100 and the upper prism sheet 300. The lower prism sheet 400 includes a lower substrate 402 and a plurality of second prism microstructures 404. Similar to the upper prism sheet 300, the lower substrate 402 may be made of polyethylene terephthalate, polycarbonate, K-resin (refractive index 1.65) or other suitable materials. The second prism microstructure 404 may be made of uv-curable adhesive, K-resin (refractive index 1.65) or other suitable high molecular polymer. In the embodiment, the lower substrate 402 has a third surface 400S1 and a fourth surface 400S2, wherein the fourth surface 400S2 faces the light emitting surface 100S2, the third surface 400S1 faces away from the light emitting surface 100S2, and the third surface 400S1 is opposite to the second surface 300S 2. The second prism microstructure 404 is disposed on the third surface 400S1 of the lower substrate 402. The second prism microstructure 404 extends along the extending direction E2, and on a plane perpendicular to the extending direction E2, the cross section of the second prism microstructure 404 is an isosceles triangle, and the vertex angle α 2 thereof falls within a range of 100 to 130 degrees, and the extending direction E2 is, for example, parallel to the light incident surface 100S 1. In a preferred embodiment, the vertex angle α 1 of the first prism microstructure 304 is 90 degrees, and the vertex angle α 2 of the second prism microstructure 404 is 120 degrees, so that the backlight module 10 can generate a brightness gain of about 80% at a front viewing angle relative to a general backlight module.
Based on the above, in the present embodiment, the backlight module 10 includes the upper prism sheet 300 and the lower prism sheet 400, the cross sections of the first prism microstructures 304 on the upper prism sheet 300 and the second prism microstructures 404 on the lower prism sheet 400 are respectively isosceles triangles, the vertex angle α 1 of the first prism microstructures 304 is in the range of 80 to 90 degrees, and the vertex angle α 2 of the second prism microstructures 404 is in the range of 100 to 130 degrees. Therefore, the backlight module 10 can generate a brightness gain of about 30% to 80% at a front viewing angle relative to a general backlight module, and the light-emitting type viewing angle of the backlight module 10 is aligned and has a better light concentration ratio under the condition of reducing the thickness of the module. Moreover, the brightness gain of the backlight module 10 is also increased.
In the present embodiment, the pitch (pitch) P1 between the first prism microstructures 304 and the pitch P2 between the second prism microstructures 404 are the same as each other, for example, 50 micrometers (μm). Where pitch is defined as the distance between repetitions of the prismatic microstructure, e.g. the distance between the apex angles of adjacent prismatic microstructures. In order to better solve the problem of moire (moire) phenomenon caused by the same pitch between the prism microstructures, in other embodiments, the included angle between the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 is in the range of 7 to 21 degrees.
As shown in table 2, further, in other embodiments, when the first prism microstructures 304 and the second prism microstructures are designed to have the same pitches P1 and P2, and the included angle between the extending direction E1 of the first prism microstructures 304 and the extending direction E2 of the second prism microstructures 404 is designed to fall within the range of 7 to 21 degrees, the backlight module 10 generates a brightness gain of about 30% to 50%. For example, when the included angle between the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 is 7, 14, 21 degrees, 50%, 41%, and 30% of brightness gains can be generated, respectively. Specifically, the angle between the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 is 14 degrees, so that the backlight module 10 has better brightness gain, wherein the extending direction E2 of the second prism microstructure 404 is parallel to the light incident surface 100S1 and the angle between the extending direction E1 of the first prism microstructure 304 and the light incident surface 100S1 is 14 degrees, or the angle between the extending direction E2 of the second prism microstructure 404 and the light incident surface 100S1 is 7 degrees and the angle between the extending direction E1 of the first prism microstructure 304 and the light incident surface 100S1 is-7 degrees (the rotation direction is opposite to the second prism microstructure 404), and the horizontal viewing angle can be further corrected by the opposite rotation directions of the two.
In another embodiment, the pitch P1 between the first prism microstructures 304 and the pitch P2 between the second prism microstructures 404 can be different from each other, for example, the pitch P1 between the first prism microstructures 304 is larger than the pitch P2 between the second prism microstructures 404. For example, the pitch P1 between the first prism microstructures 304 is 50 microns, and the pitch P2 between the second prism microstructures 404 can be in the range of 18 to 24 microns, thus improving the mohs phenomenon. Further, when the pitches P1 and P2 are designed to be different, the angle between the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 can fall within the range of 7 to 10 degrees, which can improve the mohs phenomenon. That is, when the pitches P1 and P2 are designed to be different, the extending directions E1 and E2 only need to be adjusted to a smaller angle, so as to improve the mohs phenomenon and reduce the rotation angle of the prism sheet, thereby reducing the brightness loss caused by the rotation of the prism sheet.
In one embodiment, the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 are not parallel to the light incident surface 100S 1. That is, the included angle between the plane of the incident surface 100S1 and the extending direction E1 or E2 is greater than 0.
Fig. 2 is a schematic diagram of light emission pattern of the backlight module according to the first embodiment of the utility model. Please refer to fig. 1 and fig. 2 simultaneously. In fig. 2, the pitches P1 and P2 are selected to be 50 μm, the extending direction E1 of the first prism microstructure 304 is rotated by 7 degrees, and the extending direction E2 of the second prism microstructure 404 is rotated by-7 degrees (i.e., the incident surface 100S1 and the extending directions E1 and E2 are both 7 degrees, but the angle between the extending directions E1 and E2 is 14 degrees). Referring to fig. 2, when the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 of the backlight module 10 are designed to be not parallel to the light incident surface 100S1, the light emergent angle of the backlight module 10 is aligned and concentrated.
Fig. 3 is a schematic cross-sectional view of a backlight module according to a second embodiment of the utility model. Referring to fig. 3, a backlight module 10A is similar to the backlight module 10 of fig. 1, and the main differences are: the backlight module 10A further includes a first diffusion sheet 500. In addition, in the present embodiment, the lower prism sheet 400 is disposed between the first diffusion sheet 500 and the light guide plate 100, and the upper prism sheet 300 is disposed between the first diffusion sheet 500 and the lower prism sheet 400. Among them, the haze of the first diffusion sheet 500 is preferably in the range of 30 to 60%. An included angle between the extending direction E1 of the first prism microstructure 304 and the extending direction E2 of the second prism microstructure 404 is in a range of 0 to 21 degrees, and the extending direction E2 of the second prism microstructure 404 is parallel to the light incident surface 100S 1.
In the embodiment, since the backlight module 10A further includes the first diffusion sheet 500, the brightness can be further increased by 10 to 25%, and the rainbow effect of the backlight module can be reduced. In addition, the lower the haze of the first diffusion sheet 500 is, the better the effect of the brightness gain is, but the effect of reducing the rainbow patterns is still obtained.
Fig. 4 is a schematic cross-sectional view of a backlight module according to a third embodiment of the utility model. Referring to fig. 4, a backlight module 10B is similar to the backlight module 10A of fig. 3, and the main differences are as follows. In this embodiment, the lower prism sheet 400 is disposed between the first diffusion sheet 500 'and the light guide plate 100, and the first diffusion sheet 500' is disposed between the upper prism sheet 300 and the lower prism sheet 400. The first diffusion sheet 500 has the same structure as the first diffusion sheet 500', and the backlight module 10B has the advantages similar to those of the backlight module 10A, which are not described herein again.
Fig. 5 is a schematic cross-sectional view of a backlight module according to a fourth embodiment of the utility model. Referring to fig. 5, a backlight module 10C is similar to the backlight module 10A of fig. 3, and the main differences are: the backlight module 10C further includes a second diffusion sheet 600. In this embodiment, the second diffusion sheet 600 is disposed between the upper prism sheet 300 and the lower prism sheet 400, and the lower prism sheet 400 is disposed between the second diffusion sheet 600 and the light guide plate 100. Although the two diffusion sheets 500 and 600 are disposed to slightly reduce the brightness gain effect, the overall picture of the backlight module 10C is better. The remaining advantages of the backlight module 10C are similar to those of the backlight module 10A, and are not described herein again.
FIG. 6 is a schematic cross-sectional view illustrating a lower prism sheet with an optical adhesive layer in a backlight module according to an embodiment of the utility model. FIG. 7A is a schematic cross-sectional view illustrating a lower prism sheet with pyramid microstructures according to an embodiment of the utility model. Fig. 7B is a schematic bottom view of the pyramid microstructure of fig. 7A. Referring to fig. 6, 7A and 7B, the backlight module of the embodiment of fig. 6, 7A and 7B is similar to the backlight module 10 of fig. 1, and the main differences are: the optical adhesive layer 700 (fig. 6) or the plurality of pyramid microstructures 800 (fig. 7A) are disposed on the fourth surface 400S2 of the lower substrate 402 of the lower prism sheet 400. The material of the optical adhesive layer 700 may be K-resin with a refractive index of 1.65, and the pyramid microstructures 800 preferably have a low density (e.g., a distance between each other is greater than 0 or greater than the pitch between the second prism microstructures 404). Since the backlight module has the optical adhesive layer 700 or the plurality of pyramid microstructures 800 on the lower substrate 402, the absorption between the lower prism sheet 400 and the light guide plate 100 is avoided. Compared with a backlight module without an optical adhesive layer or a plurality of pyramid microstructures, the backlight module of the embodiment can improve the brightness gain by 1 to 2 percent.
In summary, in the backlight module according to an embodiment of the utility model, since the cross sections of the first prism microstructures on the upper prism sheet and the second prism microstructures on the lower prism sheet are isosceles triangles, the vertex angle of the first prism microstructures is in a range of 80 to 90 degrees, and the vertex angle of the second prism microstructures is in a range of 100 to 130 degrees. Therefore, the light-emitting light type visual angle of the backlight module is corrected and the light concentration is better under the condition of reducing the thickness of the module. Moreover, the brightness gain value of the backlight module is also improved.
However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and the utility model is still covered by the claims and the simple equivalent changes and modifications made by the disclosure of the present invention. Furthermore, it is not necessary for any embodiment or claim of the utility model to address all of the objects, advantages, or features disclosed herein. Further, the abstract and the title (names of the utility model) are only used for assisting the retrieval of the patent documents and are not used for limiting the scope of the right of the present invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.
Description of reference numerals:
10. 10A, 10B, 10C backlight module
100 light guide plate
100S1 incident surface
100S2 light emitting surface
200 light source
300 upper prism sheet
300S1 first surface
300S2 second surface
302 upper base plate
304 first prism microstructure
400 lower prism sheet
400S1 third surface
400S2 fourth surface
402 lower substrate
404 second prism microstructure
500. 500' first diffusion sheet
600 second diffusion sheet
700 optical adhesive layer
800 pyramid microstructure
E1 and E2 extending directions
L is a light beam
P1, P2 pitch
Alpha 1 and alpha 2 are vertex angles.
Claims (10)
1. A backlight module comprises a light guide plate, a light source, an upper prism sheet and a lower prism sheet, wherein:
the light guide plate is provided with a light incident surface and a light emergent surface, and the light incident surface is connected with the light emergent surface;
the light source is arranged on one side of the light incident surface of the light guide plate and used for emitting a plurality of light beams;
the upper prism sheet is arranged on one side of the light emergent surface of the light guide plate, and comprises an upper substrate and a plurality of first prism microstructures, wherein:
the upper substrate is provided with a first surface and a second surface which are opposite; and
the plurality of first prism microstructures are arranged on the first surface of the upper substrate, the cross sections of the plurality of first prism microstructures are isosceles triangles, and the vertex angles of the plurality of first prism microstructures are within the range of 80-90 degrees; and
the lower prism sheet is arranged between the light guide plate and the upper prism sheet, and comprises a lower substrate and a plurality of second prism microstructures, wherein:
the lower substrate is provided with a third surface and a fourth surface which are opposite, and the third surface and the second surface are opposite; and
the plurality of second prism microstructures are arranged on the third surface of the lower substrate, the cross sections of the plurality of second prism microstructures are isosceles triangles, and the vertex angles of the plurality of second prism microstructures are within the range of 100-130 degrees.
2. The backlight module of claim 1, wherein a pitch between the plurality of first prism microstructures and a pitch between the plurality of second prism microstructures are the same as each other.
3. The backlight module of claim 1, wherein an included angle between the extending direction of the first plurality of prism microstructures and the extending direction of the second plurality of prism microstructures is in a range of 7 to 21 degrees.
4. The backlight module of claim 3, wherein the extending directions of the first prism microstructures and the second prism microstructures are not parallel to the light incident surface.
5. The backlight module of claim 1, wherein a pitch between the first plurality of prismatic microstructures is different from a pitch between the second plurality of prismatic microstructures.
6. The backlight module of claim 5, wherein an included angle between the extending direction of the first plurality of prism microstructures and the extending direction of the second plurality of prism microstructures is in a range of 7 to 10 degrees.
7. The backlight module of claim 1, further comprising:
and a first diffusion sheet, wherein the lower prism sheet is disposed between the first diffusion sheet and the light guide plate.
8. The backlight module of claim 7, wherein an included angle between an extending direction of the first prism microstructures and an extending direction of the second prism microstructures is in a range of 0 to 21 degrees, and the extending directions of the second prism microstructures are parallel to the light incident surface.
9. The backlight module of claim 7, further comprising:
and a second diffusion sheet disposed between the upper prism sheet and the lower prism sheet, the upper prism sheet being disposed between the first diffusion sheet and the second diffusion sheet.
10. The backlight module of claim 1, wherein an optical adhesive layer or a plurality of pyramid microstructures are disposed on the fourth surface of the lower substrate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122008337.5U CN215769109U (en) | 2021-08-25 | 2021-08-25 | Backlight module |
| TW110214373U TWM629699U (en) | 2021-08-25 | 2021-12-02 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122008337.5U CN215769109U (en) | 2021-08-25 | 2021-08-25 | Backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215769109U true CN215769109U (en) | 2022-02-08 |
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ID=80078175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122008337.5U Active CN215769109U (en) | 2021-08-25 | 2021-08-25 | Backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN215769109U (en) |
| TW (1) | TWM629699U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051048A1 (en) * | 2022-09-05 | 2024-03-14 | 瑞仪光电(南京)有限公司 | Backlight module and display apparatus |
-
2021
- 2021-08-25 CN CN202122008337.5U patent/CN215769109U/en active Active
- 2021-12-02 TW TW110214373U patent/TWM629699U/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051048A1 (en) * | 2022-09-05 | 2024-03-14 | 瑞仪光电(南京)有限公司 | Backlight module and display apparatus |
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| Publication number | Publication date |
|---|---|
| TWM629699U (en) | 2022-07-21 |
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