CN214954432U

CN214954432U - Optical composite film and light source module

Info

Publication number: CN214954432U
Application number: CN202120415623.0U
Authority: CN
Inventors: 简克伟
Original assignee: Taiwan Young Co ltd
Current assignee: Taiwan Young Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-11-30
Anticipated expiration: 2031-02-25

Abstract

The utility model provides a light source module, this light source module include base plate, a plurality of light emitting component and optics complex film. The substrate is provided with a bearing surface. The light-emitting elements are arranged on the bearing surface and are arranged in an array. The optical composite film is disposed beside the substrate and faces the light-emitting elements. The optical composite film includes an optical substrate and a prism sheet. The optical substrate is used for light to pass through. The prism sheet is arranged between the optical substrate and the substrate and comprises a plurality of first prism columns. The utility model discloses an optical composite film can promote the luminance degree of consistency and luminous efficiency, and the light source module that uses this optical composite film can reduce thickness.

Description

Optical composite film and light source module

Technical Field

The present invention relates to an optical film and a light source module, and more particularly to an optical composite film and a light source module using the same.

Background

In general, a liquid crystal display device includes a liquid crystal display panel and a backlight module, and since the liquid crystal display panel itself does not emit light, the backlight module is required to provide an illumination light source to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide an illumination source with high luminance and high uniformity.

The backlight module can be divided into a side-in type backlight module and a direct type backlight module. In the current direct type backlight module, with the development of the slim module and the Mini LED, the gap (i.e., the Optical Distance (OD)) between the Mini LED and other optical components can be reduced or even zero. However, it is more likely that the brightness of each region is not uniform on the display screen, and a dark-bright-dark-uneven (hotspot) phenomenon occurs in a dark region and a bright region.

In order to improve the phenomenon of uneven brightness (hotspot), the conventional solution is to use a plurality of diffusion sheets to improve the light diffusion effect, but the thickness and cost of the backlight module are increased. In addition, in order to further improve the diffusion effect, the haze of the diffusion sheet is generally increased, which leads to the decrease of the light extraction efficiency.

The background section is provided to aid in understanding the present invention, and therefore the disclosure of the background section may include some prior art that does not constitute a part of the knowledge of one skilled in the art. Furthermore, the disclosure of the "background" does not represent a representation of the disclosure or the problems that may be solved by one or more embodiments of the present invention, or of what is known or appreciated by those of ordinary skill in the art prior to filing the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides an optical composite film can promote the luminance degree of consistency and luminous efficiency.

The utility model provides a light source module can promote the luminance degree of consistency and luminous efficiency to reduce thickness.

Other objects and advantages of the present invention can be obtained from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the present invention provides an optical composite film including an optical substrate and a prism sheet. The optical substrate is used for light to pass through. The prism sheet is arranged opposite to the optical substrate and comprises a plurality of first prism columns.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the invention provides a light source module including a substrate, a plurality of light emitting elements, and an optical composite film. The substrate is provided with a bearing surface. The light-emitting elements are arranged on the bearing surface and are arranged in an array. The optical composite film is disposed beside the substrate and faces the light-emitting elements. The optical composite film includes an optical substrate and a prism sheet. The optical substrate is used for light to pass through. The prism sheet is arranged between the optical substrate and the substrate and comprises a plurality of first prism columns.

The utility model discloses in the light source module, a plurality of first prism columns of prism piece can reach dispersed light's effect for can be earlier tentatively split when the prism piece from the light that a plurality of light emitting component sent, later according to design demand adjustment optical substrate, can make it dispose prism column or diffusion particle, reach further spectral effect, and then promote the utility model discloses the luminance degree of consistency of light source module, owing to need not dispose a plurality of diffusion sheets like the light source module of background art, consequently compare in the light source module of background art, the utility model discloses a light source module can also promote luminous efficiency when maintaining the luminance degree of consistency that has promoted, and reduce thickness.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic perspective view of a light source module according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of an optical composite film according to another embodiment of the present invention.

Fig. 3 is a schematic perspective view of a light source module according to another embodiment of the present invention.

Fig. 4 is a schematic perspective view of a light source module according to another embodiment of the present invention.

Fig. 5 is a schematic perspective view of a light source module according to another embodiment of the present invention.

Fig. 6 is a schematic view of a first prism column according to another embodiment of the present invention.

List of reference numerals

1. 1b, 1c, 1d light source module

10 base plate

11 bearing surface

20 light emitting element

30. 30a, 30b, 30c, 30d optical composite film

40 diffusing particles

50: cementing layer

100. 100a, 100c optical substrate

101: third surface

102 fourth surface

103 long side

110 second prism column

200. 200a, 200b prism sheet

201 first surface

202 second surface

203 short side

210. 210a first prism column

211 first side

212 second side

211a first surface

212a second surface

212b third surface

D1 first direction

D2 second direction

L is light

Angle alpha, beta, theta 3

Theta 1 first vertex angle

And theta 2 is the second vertex angle.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with 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 perspective view of a light source module according to an embodiment of the present invention. Referring to fig. 1, a light source module 1 of the present embodiment includes a substrate 10, a plurality of light emitting elements 20, and an optical composite film 30. The substrate 10 has a carrying surface 11. The light emitting elements 20 are disposed on the supporting surface 11, and the light emitting elements 20 are arranged in an array, for example. Specifically, the light emitting elements 20 are arranged in a two-dimensional array, that is, a matrix, but not limited thereto. The optical composite film 30 is disposed beside the substrate 10 and faces the light-emitting elements 20. The optical composite film 30 includes an optical substrate 100 and a prism sheet 200. The optical substrate 100 is used to transmit light. The prism sheet 200 is disposed between the optical substrate 100 and the substrate 10, and includes a plurality of first prism columns 210. The first prism columns 210 of the prism sheet 200 do not directly contact the optical substrate 100, i.e., the prism sheet 200 and the optical substrate 100 are disposed at an interval on the light source module 1.

The substrate 10 is, for example, a printed circuit board, which can be a hard board or a soft board, and is used for carrying the plurality of light emitting elements 20 and driving the plurality of light emitting elements 20 to emit light through the substrate 10.

The plurality of light emitting elements 20 are, for example, sub-millimeter light emitting diodes (mini LEDs), but are not limited thereto, and may be other types of light emitting elements. The number of the plurality of light emitting elements 20 in fig. 1 is 8, for example, but not limited thereto. It should be noted that fig. 1 is intended to present an arrangement of the plurality of light emitting elements 20, the number of the plurality of light emitting elements 20 is merely an illustration, and the present invention is not particularly limited.

According to different design requirements, the light source module 1 of the present embodiment may further include at least one optical film (not shown) disposed on a side of the optical composite film 30 away from the substrate 10. The at least one optical film is, but not limited to, a brightness enhancement film, a diffuser film, a prism sheet, or a hybrid prism sheet.

In the light source module 1 of this embodiment, the first prism columns 210 of the prism sheet 200 can achieve the effect of dispersing light, so that the light L emitted from the light emitting elements 20 can be firstly split primarily when passing through the prism sheet 200, and then the optical substrate 100 can be adjusted according to design requirements, and can be configured with prism columns or diffusion particles, so that the light L can achieve further splitting effect when passing through the optical substrate 100, and further improve the brightness uniformity of the light source module 1 of this embodiment, because it is not necessary to configure a plurality of diffusion sheets as the light source module of the background art, and therefore, compared with the light source module of the background art, the embodiment of the light source module 1 can also improve the light extraction efficiency while maintaining the improved brightness uniformity, and reduce the thickness.

Various embodiments of the optical composite film 30 will now be described in detail with reference first to FIG. 1. In the optical composite film 30 of FIG. 1, the prism sheet 200 has a first surface 201 and a second surface 202 opposite to each other, the first surface 201 faces the optical substrate 100, and the second surface 202 faces the substrate 10. The plurality of first prism columns 210 are, for example, but not limited to, disposed on the first surface 201 of the prism sheet 200 facing the optical substrate 100. In other embodiments, the first prism columns 210 may also be disposed on the second surface 202 of the prism sheet 200 facing the substrate 10, which is a conventional inverse prism sheet. In addition, in the present embodiment, the optical substrate 100 includes, for example, a plurality of second prism columns 110, but is not limited thereto. The optical substrate 100 has a third surface 101 and a fourth surface 102 opposite to each other, and the second prism columns 110 are disposed on the fourth surface 102 of the optical substrate 100 facing the prism sheet 200. The first prism columns 210 and the second prism columns 110 face each other, wherein the first prism columns 210 are arranged along the first direction D1, and the second prism columns 110 are arranged along the second direction D2. The first direction D1 is substantially perpendicular to the second direction D2. Specifically, the first prism columns 210 of the present embodiment extend along the second direction D2, and the second prism columns 110 extend along the first direction D1.

The shapes of the optical substrate 100 and the prism sheet 200 of the present invention are, for example, but not limited to, rectangular. In other embodiments, the shapes of the optical substrate 100 and the prism sheet 200 may be polygonal. The first direction D1 is, for example, parallel to the short side 201 of the prism sheet 200, and the second direction D2 is, for example, parallel to the long side 101 of the optical substrate 100, but is not limited thereto. Fig. 2 is a schematic diagram of an optical composite film according to another embodiment of the present invention. Referring to FIG. 2, in another embodiment of an optical composite film 30a, the optical substrate 100a and the prism sheet 200a are rectangular, for example. The plurality of first prism columns 210 are arranged along the first direction D1, and an angle α between the first direction D1 and the short side 203 of the prism sheet 200a is 0 ° to 90 °. The second prism columns 110 are arranged along the second direction D2, and the angle β between the second direction D2 and the long side 103 of the optical substrate 100 is 0 ° to 90 °. It should be noted that the first direction D1 in fig. 2 is still substantially perpendicular to the second direction D2, so as to achieve better light splitting effect.

Referring to fig. 1 again, in order to achieve a better light splitting effect, the first prism columns 210 and the second prism columns 110 of the present embodiment have the following designs, for example: the first prism columns 210 are triangular prism shaped. Each of the first prism columns 210 has a first apex angle θ 1, which is, for example, in the range of 50 ° to 150 °. The plurality of second prism columns 110 are triangular prism shaped. Each of the second prism columns 110 has a second apex angle θ 2, which is, for example, in the range of 50 ° to 150 °.

The light source module 1 of the present embodiment further includes, for example, a plurality of diffusion particles 40, but is not limited thereto. In another embodiment, for example, the diffusion particles 40 may not be included. The diffusion particles 40 are disposed on a second surface 202 (light incident surface of the optical composite film 30) of the prism sheet 200 facing the substrate 10 and/or a third surface 101 (light emitting surface of the optical composite film 30) of the optical substrate 100 facing away from the prism sheet 200. The plurality of diffusion particles 40 in fig. 1 are illustrated as spherical particles disposed on the third surface 101. The light L can be further dispersed by the arrangement of the diffusion particles 40, so as to improve the brightness uniformity of the light source module 1. Specifically, the particle diameter of the diffusion particles 40 is, for example, 1 μm to 30 μm. The shape of these diffusion particles includes, for example, a solid sphere, a hollow sphere, a porous sphere, or a long strip, but is not limited thereto.

Fig. 3 is a schematic perspective view of a light source module according to another embodiment of the present invention. Referring to fig. 3, the light source module 1b of the present embodiment has a similar structure and advantages to the light source module 1 described above, but the difference is that in the optical composite film 30b of the light source module 1b of the present embodiment, the plurality of first prism columns 210 are disposed on the second surface 202 of the prism sheet 200b facing the substrate 10, i.e. the conventional inverse prism structure. In the present embodiment, the first direction D1 of the first prism columns 210 and the second direction D2 of the second prism columns 110 are still substantially perpendicular. According to the geometric optical calculation, when the light L directly irradiates the first prism columns 210, the light L is divided into refracted light and reflected light, and the refracted light and the reflected light are respectively emitted from different positions of the prism sheet 200b, so as to achieve the light splitting effect.

Fig. 4 is a schematic perspective view of a light source module according to another embodiment of the present invention. Referring to fig. 4, the light source module 1c of the present embodiment has a similar structure and advantages to the light source module 1 described above, but the difference is that in the optical composite film 30c of the light source module 1c of the present embodiment, the optical substrate 100c does not include a plurality of second prism columns, that is, the third surface 101 of the side of the optical substrate 100c away from the prism sheet 200 is configured with the diffusion particles 40, but the fourth surface 102 of the side facing the prism sheet 200 is not configured with a plurality of second prism columns. Although the second prism columns are not included, the optical substrate 100c of the present embodiment can also achieve the effect of dispersing light by diffusing the particles 40.

Fig. 5 is a schematic perspective view of a light source module according to another embodiment of the present invention. Referring to fig. 5, the light source module 1d of the present embodiment has a similar structure and advantages to the light source module 1 described above, and only the main differences of the structure will be described below. The light source module 1d of the present embodiment further includes, for example, a glue layer 50 disposed between the optical substrate 100 and the prism sheet 200 of the optical composite film 30 d. The adhesive layer 50 serves to bond the optical substrate 100 and the prism sheet 200. Since the first prism columns 210 face the optical substrate 100 and the second prism columns 110 face the prism sheet 200, the first prism columns 210 and the second prism columns 110 are located in the adhesive layer 50 after being bonded, thereby reducing the probability of scratching and damaging the first prism columns 210 and the second prism columns 110. The design of the present embodiment is also applicable to the light source module 1c, i.e. the embodiment in which the optical substrate 100 does not include the second prism column 110.

The adhesive layer 50 includes, for example, an optical adhesive, a transparent adhesive, and the like, but is not limited thereto as long as it has a light-transmitting function. In addition, in order to achieve a better light splitting effect, the refractive index of the glue layer 50 is, for example, respectively smaller than the refractive index of the optical substrate 100 and the refractive index of the prism sheet 200, so that the density of the medium on the transmission path of the light L is dense (prism sheet 200), sparse (glue layer 50), and dense (optical substrate 100) in sequence, which has a similar effect to the air gap between the optical substrate 100 and the prism sheet 200 in the above embodiments of the light source modules. The refractive indexes of the adhesive layer 50, the optical substrate 100 and the prism sheet 200 are, for example, between 1.4 and 1.7.

In the light source module 1d of the present embodiment, the plurality of diffusion particles 40 are, for example, uniformly distributed in the glue layer 50, but not limited thereto. The diffusion particles 40 may be disposed on the second surface 202 of the prism sheet 200 facing the substrate 10 (light incident surface of the optical composite film 30 d) and/or the third surface 101 of the optical substrate 100 facing away from the prism sheet 200 (light emitting surface of the optical composite film 30 d).

Fig. 6 is a schematic view of a first prism column according to another embodiment of the present invention. Referring to fig. 6, the first prism column 210a of the present embodiment has similar advantages to the first prism column 210, and only the main differences of the structure will be described below. The first prism column 210a of the present embodiment has a first side 211 and a second side 212 opposite to each other. The first side 211 has a first surface 211 a. The second side 212 has a second surface 212a and a third surface 212 b. The second surface 212a is connected between the first surface 211a and the third surface 212 b. Specifically, the included angle θ 1 between the first surface 211a and the second surface 212a is, for example, greater than the included angle θ 3 formed by the extending intersection of the first surface 211a and the third surface 212 b. The included angle theta 1 is the same as the first vertex angle theta 1, and the angle range is 50-150 degrees. The angle range of the included angle θ 3 is, for example, 45 ° to 150 °. The first prism column 210a of the present embodiment can be replaced with the first prism column 210 of any of the above embodiments, and the present invention is not particularly limited.

To sum up, the utility model discloses in the light source module, a plurality of first prism columns of prism piece can reach dispersed light's effect for light that sends from a plurality of light emitting component can tentatively divide light earlier when the prism piece, later according to design demand adjustment optical substrate, can make it dispose prism column or diffusion particle, let light can reach further beam split effect when optical substrate, and then promote the luminance degree of consistency of the light source module of this embodiment, owing to need not dispose a plurality of diffusion sheets like the light source module of background art, consequently compare in the light source module of background art, the utility model discloses the light source module can also promote luminous efficiency when maintaining the luminance degree of consistency that has promoted, and reduce thickness.

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 all the simple equivalent changes and modifications made according to the claims and the contents of the specification should be included in the scope of the present invention. Moreover, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. Furthermore, the abstract and the title of the specification are provided only for assisting the retrieval of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description and in the claims are used for naming elements (elements) or distinguishing between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.

Claims

1. An optical composite film comprising an optical substrate and a prism sheet, wherein

The optical substrate is used for enabling light to pass through; and

the prism sheet is arranged opposite to the optical substrate and comprises a plurality of first prism columns, wherein the prism sheet and the optical substrate are arranged at intervals.

2. An optical composite film according to claim 1, wherein the first prism columns are disposed on a side of the prism sheet facing the optical substrate.

3. An optical composite film according to claim 2, wherein the optical substrate comprises a plurality of second prism columns disposed on a side of the optical substrate facing the prism sheet.

4. An optical composite film as recited in claim 3, wherein the first plurality of prism columns are aligned along a first direction and the second plurality of prism columns are aligned along a second direction, the first direction being substantially perpendicular to the second direction.

5. The optical composite film according to claim 2, further comprising a glue layer disposed between the optical substrate and the prism sheet.

6. An optical composite film according to claim 5, wherein the refractive index of the glue layer is smaller than the refractive index of the optical substrate and the refractive index of the prism sheet.

7. An optical composite film according to claim 5 further comprising a plurality of diffusing particles uniformly distributed within the glue layer.

8. An optical composite film according to claim 7 wherein the plurality of diffusing particles have a particle size of 1 to 30 μm and the shape of the plurality of diffusing particles includes a solid sphere, a hollow sphere, a porous sphere or a strip.

9. The optical composite film according to claim 1, further comprising a plurality of diffusing particles disposed on one side of the prism sheet away from the optical substrate or one side of the optical substrate away from the prism sheet.

10. An optical composite film according to claim 9 wherein the plurality of diffusing particles have a particle size of 1 to 30 μm and the shape of the plurality of diffusing particles includes a solid sphere, a hollow sphere, a porous sphere or a strip.

11. An optical composite film as recited in claim 1, wherein the first plurality of prism columns are triangular prism shaped, each of the first plurality of prism columns having a first apex angle in the range of 50 ° to 150 °.

12. An optical composite film as recited in claim 1, wherein each of the first plurality of prism columns has opposing first and second sides, the first side has a first surface, the second side has a second surface and a third surface, the second surface is connected between the first and third surfaces, and the included angle between the first and second surfaces is greater than the included angle formed by the extended intersection of the first and third surfaces.

13. A light source module comprises a substrate, a plurality of light emitting elements and an optical composite film

The substrate is provided with a bearing surface;

the light-emitting elements are configured on the bearing surface and are arranged in an array; and

the optical composite film is arranged beside the substrate and faces the light-emitting elements, and comprises an optical substrate and a prism sheet

The optical substrate is used for enabling light to pass through; and

the prism sheet is arranged between the optical substrate and the substrate and comprises a plurality of first prism columns, wherein the prism sheet and the optical substrate are arranged at intervals.

14. The light source module of claim 13, wherein the first prism columns are disposed on a side of the prism sheet facing the optical substrate.

15. The light source module of claim 14, wherein the optical substrate comprises a plurality of second prism columns disposed on a side of the optical substrate facing the prism sheet.

16. The light source module of claim 15, wherein the first plurality of prism columns are aligned along a first direction and the second plurality of prism columns are aligned along a second direction, the first direction being substantially perpendicular to the second direction.

17. The light source module of claim 14, further comprising a glue layer disposed between the optical substrate and the prism sheet.

18. The light source module of claim 17, wherein the refractive index of the glue layer is less than the refractive index of the optical substrate and the refractive index of the prism sheet.

19. The light source module of claim 17, further comprising a plurality of diffusing particles uniformly distributed within the glue layer.

20. The light source module according to claim 19, wherein the plurality of diffusion particles have a particle size of 1 μm to 30 μm, and a shape of the plurality of diffusion particles includes a solid sphere, a hollow sphere, a porous sphere, or a long strip.

21. The light source module of claim 13, wherein the first plurality of prism columns are disposed on a side of the prism sheet facing the substrate, and the optical substrate comprises a second plurality of prism columns disposed on a side of the optical substrate facing the prism sheet.

22. The light source module of claim 21, wherein the first plurality of prism columns are aligned along a first direction and the second plurality of prism columns are aligned along a second direction, the first direction being substantially perpendicular to the second direction.

23. The light source module of claim 13, further comprising a plurality of diffusion particles disposed on a side of the prism sheet facing the substrate or a side of the optical substrate away from the prism sheet.

24. The light source module according to claim 23, wherein the plurality of diffusion particles have a particle size of 1 μm to 30 μm, and a shape of the plurality of diffusion particles includes a solid sphere, a hollow sphere, a porous sphere, or a long strip.

25. The light source module of claim 13, wherein the plurality of first prism columns are triangular prism shaped, each of the plurality of first prism columns having a first apex angle in a range of 50 ° to 150 °.

26. The light source module of claim 13, wherein each of the first prism columns has a first side and a second side opposite to each other, the first side has a first surface, the second side has a second surface and a third surface, the second surface is connected between the first surface and the third surface, and an included angle between the first surface and the second surface is larger than an included angle formed by extension and intersection of the first surface and the third surface.