CN216411627U

CN216411627U - Light collecting type light guide plate and backlight module

Info

Publication number: CN216411627U
Application number: CN202123139182.5U
Authority: CN
Inventors: 周民俊; 林冠廷; 房昱赋; 杨越峰
Original assignee: Taiwan Young Co ltd; Nano Precision Suzhou Co Ltd
Current assignee: Taiwan Young Co ltd; Nano Precision Suzhou Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-04-29
Anticipated expiration: 2031-12-14
Also published as: TWM634732U

Abstract

The utility model provides a light-collecting light guide plate which comprises a plate body, a strip-shaped structure and a bent prism structure. The plate body is provided with a first surface, a second surface, a third surface, a fourth surface and a light incident surface. The strip structures are formed on the first surface, extend along the first direction and are arranged along the second direction. Each strip-shaped structure comprises a first inclined plane and a second inclined plane which are respectively inclined to the first surface and opposite in inclined direction. Each bent prism structure is arranged on the strip structure, and two ends of each bent prism structure respectively extend to the first inclined plane and the second inclined plane of the strip structure. Each bending prism structure is provided with a first light receiving surface and a second light receiving surface facing the light incoming surface, and a first backlight surface and a second backlight surface facing away from the light incoming surface. In addition, a backlight module including the light collecting type light guide plate is also provided. The light-collecting light guide plate and the backlight module can concentrate the energy of light beams emitted from the light guide plate and finely control the emitting angle of the light beams.

Description

Light collecting type light guide plate and backlight module

Technical Field

The present invention relates to a light guide plate and a backlight module, and more particularly, to a light collecting light guide plate and a backlight module.

Background

In the conventional side-in backlight module, the light incident surface of the light guide plate receives a light beam from a light source, and the light beam enters the light guide plate and then passes through a geometric structure arranged on the upper surface or the lower surface of the light guide plate, so that the total reflection of the light beam is damaged, and the light beam is emitted from the upper surface of the light guide plate. And by means of the optical film group arranged on the light guide plate, the forward luminance of the side-in type backlight module is improved and the visual angle range is controlled.

In order to make the light inside the light guide plate more efficiently utilized by the optical film set, the geometric structure disposed on the upper surface or the lower surface of the light guide plate is usually optimized. However, the light beam is transmitted to the optimized geometric structure, and a certain degree of stray light is still formed, so that the energy is not concentrated enough after the light beam is refracted out of the light guide plate. Therefore, it is one of the issues that researchers have demanded to solve to make the light beam energy refracted from the light guide plate more concentrated and make the light beam more efficiently used by the optical film set.

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

SUMMERY OF THE UTILITY MODEL

The utility model provides a light-collecting light guide plate, which can concentrate the energy of light beams emitted from the light guide plate and can finely control the emitting angle of the light beams.

The utility model provides a backlight module, which applies the light-collecting type light guide plate and has high forward luminance.

Other objects and advantages of the present invention will be further understood 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 light-collecting light guide plate includes a plate body, a plurality of strip structures, and a plurality of curved prism structures. The plate body is provided with a first surface, a second surface, a third surface, a fourth surface and a light incident surface, wherein the first surface faces away from the second surface, the third surface and the fourth surface are mutually opposite and are connected with the first surface and the second surface, and the light incident surface is connected with the first surface, the second surface, the third surface and the fourth surface. The plurality of strip-shaped structures are formed on the first surface, extend along a first direction, and are arranged on the first surface along a second direction perpendicular to the first direction, wherein the first direction is perpendicular to the light incident surface. Each strip-shaped structure comprises a first inclined surface and a second inclined surface. The first inclined surface is inclined to the first surface and faces the third surface. The angle of the included angle between the first inclined surface and the first surface is greater than or equal to 5 degrees and less than or equal to 60 degrees. The second slope is inclined to the first surface and faces the fourth surface. The first inclined surface is inclined with respect to the first surface in a direction opposite to a direction in which the second inclined surface is inclined with respect to the first surface. The angle of the included angle between the second inclined surface and the first surface is greater than or equal to 5 degrees and less than or equal to 60 degrees. Each bent prism structure is arranged on one of the strip structures, and two ends of each bent prism structure respectively extend to the first inclined plane and the second inclined plane of one of the strip structures. Each curved prism structure is provided with a first light facing surface facing the light incoming surface and connected with the first inclined surface, a first backlight surface facing away from the light incoming surface and connected with the first inclined surface, a second light facing surface facing the light incoming surface and connected with the second inclined surface, and a second backlight surface facing away from the light incoming surface and connected with the second inclined surface. The angle of the included angle between the first light facing surface and the first inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees. The angle of the included angle between the second light facing surface and the second inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees. The first light-facing surface and the second light-facing surface of each curved prism structure are planes.

In order to achieve one or a part of or all of the above or other objects, a backlight module according to an embodiment of the utility model includes the light-collecting light guide plate, a light source, and at least one film. The light source is arranged on the light incident surface of the plate body of the light-collecting type light guide plate to provide light beams. The second surface of the plate body of the light-collecting light guide plate is positioned between the first surface of the plate body of the light-collecting light guide plate and the at least one film.

Based on the above, by using the strip structure and the curved prism structure, the light-collecting light guide plate not only can concentrate the energy of the light beam emitted from the light-collecting light guide plate, but also can control the emitting angle of the light beam more finely, so that the light beam can be incident at a better angle by cooperating with the film used by the backlight module, and further the forward luminance of the backlight module is improved.

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 side view of a backlight module 10 according to an embodiment of the utility model.

Fig. 2 is a schematic oblique view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 3 is a schematic top view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 4 is a partially enlarged view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 5 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 6 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 7 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Fig. 8 is a schematic oblique view of a light collecting type light guide plate 100A according to another embodiment of the present invention.

Fig. 9 is a schematic cross-sectional view of a light collecting type light guide plate 100A according to another embodiment of the utility model.

Fig. 10 is a schematic cross-sectional view of a light collecting type light guide plate 100A according to another embodiment of the utility model.

Fig. 11 is an oblique view schematically illustrating a light collecting type light guide plate 100B according to still another embodiment of the present invention.

Fig. 12 is a schematic cross-sectional view of a light collecting type light guide plate 100B according to still another embodiment of the utility model.

Fig. 13 is a schematic diagram illustrating a cross section of the strip-shaped structures 120C and the curved prism structures 130C of the light-collecting light guide plate according to an embodiment of the utility model, the cross section being parallel to the light incident surface.

Fig. 14 is a schematic diagram illustrating a cross section of a strip-shaped structure 120D and a curved prism structure 130D of a light-collecting light guide plate according to another embodiment of the present invention, the cross section being parallel to the light incident surface.

Fig. 15 is a schematic diagram illustrating a cross section of a curved prism structure 130E of a light-collecting light guide plate perpendicular to an incident surface according to another embodiment of the present invention.

Fig. 16 is a schematic diagram illustrating a cross section of a curved prism structure 130F of a light-collecting light guide plate perpendicular to an incident surface according to still another embodiment of the present invention.

Fig. 17 is a schematic oblique view of a light-collecting light guide plate 100G according to an embodiment of the utility model.

Fig. 18 is a schematic oblique view of a light-collecting light guide plate 100H according to another embodiment of the present invention.

List of reference numerals

10 backlight module

100. 100A, 100B, 100G, 100H light-collecting light guide plate

110: plate body

110s structural surface

111 first surface

112 second surface

113 third surface

114 fourth surface

115 incident light surface

116: fifth surface

120. 120B, 120C, 120D, 120H strip structure

120x central axis

120-1: first strip structure

120-2 second strip structure

120-3 the third strip structure

120-4: fourth strip structure

121: first inclined plane

122 second inclined plane

123. 131c top surface

130. 130A, 130B, 130C, 130D, 130E, 130F, 130G, 130H curved prism structures

130e terminal

130e1 first end

130e2 second end

131a first light-facing surface

131b first backlight surface

132a second light-facing side

132b second backlight surface

200 light source

300 diaphragm

310 first prism sheet

320 second prism sheet

330 upper diffusion sheet

A1, A2, a1, a2, Z1, Z2

C1, C2, K1, K2, K1 and K2 as transversal lines

L is a light beam

l1 first ridge

l2 second ridge

l3 third margin

R is local

W, Y, b1, b2, c1, c2, E, F size

x is the second direction

y is the first direction

z is the third direction

Included angles of theta 1, theta 2, alpha 1 and alpha 2

Gamma is the angle of emergence

Angle of incidence

I-I ', II-II ', III-III ' are cut.

Detailed Description

The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the preferred embodiments, 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.

Reference will now be made in detail to exemplary embodiments of the utility model, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

For clarity, a first direction y, a second direction x and a third direction z are depicted in the drawings perpendicular to each other in the present specification.

Fig. 1 is a side view of a backlight module 10 according to an embodiment of the utility model. Fig. 2 is a schematic oblique view of a light-collecting light guide plate 100 according to an embodiment of the utility model.

Referring to fig. 1 and 2, the backlight module 10 includes a light-collecting type light guide plate 100. The light collecting type light guide plate 100 includes a plate body 110. The plate body 110 has a first surface 111, a second surface 112, a third surface 113, a fourth surface 114 and an incident surface 115, wherein the first surface 111 faces away from the second surface 112, the third surface 113 and the fourth surface 114 are opposite to each other and connect the first surface 111 and the second surface 112, and the incident surface 115 connects the first surface 111, the second surface 112, the third surface 113 and the fourth surface 114.

The backlight module 10 further includes a light source 200 disposed on the light incident surface 115 of the plate 110 to provide a light beam L. For example, in the present embodiment, the light source 200 may optionally include a light emitting diode device, but the utility model is not limited thereto.

The backlight module 10 further includes at least one film 300, wherein the second surface 112 of the board body 110 is located between the first surface 111 of the board body 110 and the at least one film 300. In the present embodiment, the first surface 111 is, for example, a bottom surface of the board body 110, and the second surface 112 is, for example, a top surface of the board body 110.

The light-collecting light guide plate 100 further includes a plurality of strip structures 120 formed on the structure surface 110s and extending along a first direction y, and arranged on the structure surface 110s along a second direction x perpendicular to the first direction y, where the first direction y is perpendicular to the light incident surface 115. In the present embodiment, the structure surface 110s on which the plurality of bar structures 120 are located is, for example, the first surface 111 of the board body 110 (or, the bottom surface of the board body 110). However, the present invention is not limited thereto, and in other embodiments, the structure surface 110s on which the plurality of bar structures 120 are located may be the second surface 112 of the board body 110 (or, the top surface of the board body 110).

Referring to fig. 2, each of the bar structures 120 includes a first inclined surface 121 and a second inclined surface 122. The first inclined surface 121 of each bar-shaped structure 120 is inclined to the first surface 111 of the board body 110 and faces the third surface 113 of the board body 110. An angle θ 1 between the first inclined surface 121 of each of the bar structures 120 and the first surface 111 of the plate body 110 is greater than or equal to 5 degrees and less than or equal to 60 degrees. The second inclined surface 122 of each bar-shaped structure 120 is inclined to the first surface 111 of the board body 110 and faces the fourth surface 114 of the board body 110. The first inclined surface 121 of each bar-shaped structure 120 is inclined with respect to the first surface 111 of the board body 110 in a direction opposite to the direction in which the second inclined surface 122 of each bar-shaped structure 120 is inclined with respect to the first surface 111 of the board body 110. The angle θ 2 between the second inclined surface 122 of each strip-shaped structure 120 and the first surface 111 of the plate body 110 is greater than or equal to 5 degrees and less than or equal to 60 degrees.

For example, in the present embodiment, an angle θ 1 between the first inclined surface 121 of the bar-shaped structure 120 and the first surface 111 of the plate body 110 and an angle θ 2 between the second inclined surface 122 of the bar-shaped structure 120 and the first surface 111 of the plate body 110 may be selectively equal. Specifically, in the present embodiment, the bar structures 120 may be isosceles triangular columns. However, the utility model is not limited thereto, and in other embodiments, the bar-shaped structures may be columns with other shapes.

Referring to fig. 1 and 2, the light-collecting light guide plate 100 further includes a plurality of curved prism structures 130. Referring to fig. 2, each of the curved prism structures 130 is disposed on a corresponding one of the bar structures 120, and two ends 130e of each of the curved prism structures extend to the first inclined surface 121 and the second inclined surface 122 of the corresponding bar structure 120, respectively.

Referring to fig. 2, in detail, in the present embodiment, the plurality of bar structures 120 are sequentially arranged along the second direction x; the two ends 130e of each curved prism structure 130 include a second end 130e2 and a first end 130e1 sequentially arranged in the second direction x; the second end 130e2 of each curved prism structure 130 can extend to the first inclined surface 121 of the previous bar-shaped structure 120, in addition to the second inclined surface 122 of the bar-shaped structure 120; the first end 130e1 of each curved prism structure 130 can extend to the first inclined surface 121 of the bar-shaped structure 120, and can further extend to the second inclined surface 122 of the next bar-shaped structure 120.

For example, in the present embodiment, the plurality of bar structures 120 includes a first bar structure 120-1, a second bar structure 120-2, a third bar structure 120-3 and a fourth bar structure 120-4 sequentially arranged in the second direction x, and the first end 130e1 of the curved prism structure 130 disposed on the first bar structure 120-1 may further selectively extend to the second inclined plane 122 of the second bar structure 120-2, except that it extends to the first inclined plane 121 of the first bar structure 120-1; the second end 130e2 of the curved prism structure 130 disposed on the third bar-shaped structure 120-3 can be selectively extended to the first inclined surface 121 of the second bar-shaped structure 120-2, in addition to the second inclined surface 122 of the third bar-shaped structure 120-3; the first end 130e1 of the curved prism structure 130 disposed on the third bar structure 120-3 can be selectively extended to the second inclined surface 122 of the fourth bar structure 120-4 in addition to the first inclined surface 121 of the third bar structure 120-3; but the utility model is not limited thereto.

Referring to fig. 2, in the present embodiment, the plurality of curved prism structures 130 may be respectively disposed on the first bar-shaped structure 120-1 and the third bar-shaped structure 120-3, the second bar-shaped structure 120-2 and the fourth bar-shaped structure 120-4 may not be disposed with the plurality of curved prism structures 130, and the plurality of curved prism structures 130 respectively disposed on the first bar-shaped structure 120-1 and the third bar-shaped structure 120-3 are separated by the second bar-shaped structure 120-2. That is, in the present embodiment, the plurality of curved prism structures 130 may be disposed on the odd number of bar structures 120, but not disposed on the even number of bar structures 120; that is, the plurality of curved prism structures 130 may be interlaced, so that two adjacent rows of curved prism structures 130 are not easily interfered with each other.

In addition, in the present embodiment, the arrangement density of the plurality of curved prism structures 130 increases from the light incident surface 115 close to the plate body 110 to the light incident surface 115 away from the light incident surface 115 along the first direction y. In other words, in the present embodiment, the farther from the light incident surface 115, the higher the arrangement density of the plurality of curved prism structures 130; therefore, the uniformity of the light emitted from the second surface 112 of the light-collecting light guide plate 100 can be improved; but the utility model is not limited thereto.

Fig. 4 is a partially enlarged view of a light-collecting light guide plate 100 according to an embodiment of the utility model. Fig. 4 corresponds to a part R of the light-collecting light guide plate 100 of fig. 3.

Fig. 5 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model. Fig. 5 corresponds to the section line I-I' of fig. 4.

Fig. 6 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model. Fig. 6 corresponds to the section line II-II' of fig. 4.

Fig. 7 is a schematic cross-sectional view of a light-collecting light guide plate 100 according to an embodiment of the utility model. Fig. 7 corresponds to the section line III-III' of fig. 4.

Referring to fig. 2, 3 and 4, each of the curved prism structures 130 has a first light-facing surface 131a, a first light-facing surface 131b, a second light-facing surface 132a and a second light-facing surface 132b, wherein the first light-facing surface 131a faces the light-entering surface 115 of the plate body 110 and is connected to the first inclined surface 121 of the bar structure 120, the first light-facing surface 131b faces away from the light-entering surface 115 of the plate body 110 and is connected to the first inclined surface 121 of the bar structure 120, the second light-facing surface 132a faces the light-entering surface 115 of the plate body 110 and is connected to the second inclined surface 122 of the bar structure 120, and the second light-facing surface 132b faces away from the light-entering surface 115 of the plate body 110 and is connected to the second inclined surface 122 of the bar structure 120.

Referring to fig. 4 and 6, an angle α 1 between the first light-facing surface 131a of each curved prism structure 130 and the first inclined surface 121 of the bar structure 120 is greater than or equal to 5 degrees and less than or equal to 45 degrees. Referring to fig. 4 and 7, an angle α 2 between the second light-facing surface 132a of each curved prism structure 130 and the second inclined surface 122 of the bar structure 120 is greater than or equal to 5 degrees and less than or equal to 45 degrees. Referring to fig. 2, 4, 6 and 7, the first light-facing surface 131a and the second light-facing surface 132a of each curved prism structure 130 are both planar.

Referring to fig. 2, fig. 3 and fig. 4, in the present embodiment, the first light-facing surface 131a and the first backlight surface 131b of each curved prism structure 130 are connected to a first ridge line l1, the second light-facing surface 132a and the second backlight surface 132b of each curved prism structure 130 are connected to a second ridge line l2 (shown in fig. 2 and fig. 3), the first ridge line l1 and the second ridge line l2 are respectively crossed with the first direction y (i.e., the extending direction of the bar structure 120), and the first ridge line l1 is connected to the second ridge line l 2.

In addition, in the present embodiment, the first inclined surface 121 and the second inclined surface 122 of each of the bar-shaped structures 120 may intersect with the third ridge l3, and the third ridge l3 is parallel to the first direction y. In the present embodiment, the first edge line l1 and the second edge line l2 of each curved prism structure 130 are not parallel, and the first edge line l1 and the second edge line l2 of each curved prism structure 130 are staggered with the third edge line l3 of a corresponding one of the bar structures 120. In this embodiment, a cross section of each of the bar structures 120 parallel to the light incident surface 115 (refer to fig. 5) is triangular, and the curved prism structures 130 extend from the first inclined surfaces 121 of the bar structures 120 to the second inclined surfaces 122 through the third edge l 3.

Referring to fig. 2, 3, 4 and 5, an angle Z1 (shown in fig. 5) is formed between a sectional line C1 (shown in fig. 5) parallel to the light incident surface 115 of the plate body 110 and the second direction x of the first light-facing surface 131a of each curved prism structure 130. Referring to fig. 2, 3, 4 and 6, an angle a1 (shown in fig. 6) is formed between a sectional line K1 (shown in fig. 6) perpendicular to the light incident surface 115 of the plate body 110 and the first direction y of the first light-facing surface 131a of each curved prism structure 130. Referring to fig. 4, fig. 5 and fig. 6, in the present embodiment, the angle Z1 and the angle a1 may be different.

Referring to fig. 2, 3, 4 and 5, an angle Z2 (shown in fig. 5) is formed between a sectional line C2 (shown in fig. 5) parallel to the light incident surface 115 of the plate body 110 and the second direction x of the second light-facing surface 132a of each curved prism structure 130. Referring to fig. 2, 3, 4 and 7, an angle a2 is formed between a sectional line K2 (shown in fig. 7) perpendicular to the light incident surface 115 of the plate body 110 and the first direction y of the second light-facing surface 132a of each curved prism structure 130. Referring to fig. 4, 5 and 7, in the present embodiment, the angle Z2 and the angle a2 may be different.

Referring to fig. 2, that is, in the present embodiment, an inclination angle of the first light-facing surface 131a (and/or the second light-facing surface 132a) of the curved prism structure 130 with respect to the xz plane may be designed according to actual requirements, and an inclination angle of the first light-facing surface 131a (and/or the second light-facing surface 132a) of the curved prism structure 130 with respect to the yz plane may also be independently designed according to actual requirements, where the xz plane is a plane in which the second direction x and the third direction z are located, and the yz plane is a plane in which the first direction y and the third direction z are located. Referring to fig. 1 and fig. 2, the light-collecting light guide plate 100 not only concentrates the energy of the light beam L (indicated in fig. 1) emitted from the second surface 112, but also precisely adjusts the emission angle γ (indicated in fig. 1) of the light beam L, so that the light beam L can be incident at a better incident angle γ' in cooperation with the design of the film 300, thereby improving the forward luminance of the backlight module 10.

Referring to fig. 1 and fig. 2, for example, in the present embodiment, the number of at least one film 300 of the backlight module 10 may be selectively multiple. In the present embodiment, the plurality of films 300 may include a first prism sheet 310, a second prism sheet 320, and an upper diffusion sheet 330 stacked on the plate body 110 in the third direction z, wherein the extending direction of the prism structures of the first prism sheet 310 is staggered with the extending direction of the prism structures of the second prism sheet 320. In the present embodiment, by the strip-shaped structures 120 and the curved prism structures 130, the light-collecting light guide plate 100 can control the light energy distribution field shape on the plate body 110, so that the light beam L emitted from the plate body 110 can be guided to the front viewing direction (i.e. the third direction z) after passing through the first prism sheet 310 and the second prism sheet 320, thereby improving the front luminance of the backlight module 10. In other words, in the embodiment, by the strip structures 120 and the curved prism structures 130, the lower diffusion sheet is not selectively disposed between the plate body 110 of the light-collecting light guide plate 100 and the first prism sheet 310, thereby achieving the effect of thinning the backlight module 10.

However, the present invention is not limited thereto, and in other embodiments, the number and/or the type of the films 300 of the backlight module 10 may be designed differently according to different requirements; for example, in another embodiment, the plurality of films 300 may also include a lower diffusion sheet (not shown), a first prism sheet 310, a second prism sheet 320, and an upper diffusion sheet 330 sequentially stacked on the plate body 110 along the third direction z, and the bar structures 120 and the curved prism structures 130 of the light collecting and guiding plate 100 may also be designed for the plurality of films 300, so that the light beam L emitted from the plate body 110 is guided to the front viewing direction after passing through the lower diffusion sheet (not shown) and the first prism sheet 310, thereby improving the forward luminance of the backlight module 10.

Referring to fig. 2, 3, 4 and 5, an angle Z1 is included between a sectional line C1 parallel to the light incident surface 115 of the plate body 110 and the second direction x of the first light-facing surface 131a of each curved prism structure 130, and an angle Z2 is included between a sectional line C2 parallel to the light incident surface 115 of the plate body 110 and the second direction x of the second light-facing surface 132a of each curved prism structure 130. In the present embodiment, the angle Z1 and the angle Z2 may be optionally the same. However, the utility model is not limited thereto, and in other embodiments, the angle Z1 and the angle Z2 may be different, which will be illustrated in the following paragraphs with reference to other drawings.

Referring to fig. 2, 3, 4 and 6, an angle a1 is included between a section line K1 perpendicular to the light incident surface 115 and the first direction y of the first light-facing surface 131a of each curved prism structure 130, and an angle a1 is included between a section line K1 perpendicular to the light incident surface 115 and the first direction y of the first back-light surface 131b of each curved prism structure 130. In the present embodiment, the angle a1 and the angle a1 may be the same. However, the utility model is not limited thereto, and in other embodiments, the angle a1 and the angle a1 may be different, which will be illustrated in the following paragraphs with reference to other drawings.

Referring to fig. 2, 3, 4 and 7, the second light-facing surface 132a of each curved prism structure 130 forms an angle a2 with the first direction y at a sectional line K2 perpendicular to the light-incident surface 115, and the second backlight surface 132b of each curved prism structure 130 forms an angle a2 with the first direction y at a sectional line K2 perpendicular to the light-incident surface 115. In the present embodiment, the angle a2 and the angle a2 may be the same. However, the utility model is not limited thereto, and in other embodiments, the angle a2 and the angle a2 may be different, which will be illustrated in the following paragraphs with reference to other drawings.

Referring to fig. 2, fig. 3 and fig. 4, in the present embodiment, each of the curved prism structures 130d is arranged in a mirror symmetry manner with a central axis 120x (labeled in fig. 2) of the bar structure 120 as a symmetry axis, but the present invention is not limited thereto. In the present embodiment, the area of the first light-facing surface 131a of each curved prism structure 130 may be equal to the area of the first backlight surface 131b of the curved prism structure 130, and the area of the second light-facing surface 132a of each curved prism structure 130 may be equal to the area of the second backlight surface 132b of the curved prism structure 130. However, the present invention is not limited thereto, and in other embodiments, the area of the first light-facing surface 131a and the area of the first backlight surface 131b of each curved prism structure 130 may also be unequal, and the area of the second light-facing surface 132a and the area of the second backlight surface 132b of each curved prism structure 130 may also be unequal, which will be illustrated in the following paragraphs with reference to other drawings.

Referring to fig. 4 and 5, the bar-shaped structures 120 may have a dimension W in the second direction x, and the bar-shaped structures 120 may have a dimension Y in the third direction z. For example, in the present embodiment, 2 μm < W <500 μm, and 2 μm < Y <500 μm, but the present invention is not limited thereto.

Referring to fig. 4 and 6, a portion of the curved prism structure 130 on the first inclined surface 121 may have a dimension b1 in the first direction y, and a portion of the curved prism structure 130 on the first inclined surface 121 may have a dimension c1 in the third direction z. For example, in the present embodiment, 2 μm < b1<500 μm, and 2 μm < c1<500 μm, but the present invention is not limited thereto.

Referring to fig. 4 and 7, a portion of the curved prism structure 130 on the second inclined surface 122 may have a dimension b2 in the first direction y, and a portion of the curved prism structure 130 on the second inclined surface 122 may have a dimension c2 in the third direction z. For example, in the present embodiment, 2 μm < b2<500 μm, and 2 μm < c2<500 μm, but the present invention is not limited thereto.

It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, which will not be repeated below.

Fig. 9 is a schematic cross-sectional view of a light collecting type light guide plate 100A according to another embodiment of the utility model. Fig. 9 shows a cross section of the light-collecting light guide plate 100A perpendicular to the light incident surface 115 and passing through the first light-facing surface 131a and the first light-reflecting surface 131b of the curved prism structure 130A.

Fig. 10 is a schematic cross-sectional view of a light collecting type light guide plate 100A according to another embodiment of the utility model. Fig. 10 shows another cross section of the light collecting type light guide plate 100A perpendicular to the light incident surface 115 and passing through the second light facing surface 132a and the second light back surface 132b of the curved prism structure 130A.

The light-collecting light guide plate 100A shown in fig. 8, 9 and 10 is similar to the light-collecting light guide plate 100 shown in fig. 2, 6 and 7, and has the following differences: the curved prism structure 130A of the light collection type light guide plate 100A is different from the curved prism structure 130 of the light collection type light guide plate 100.

Referring to fig. 8 and 9, in the present embodiment, an angle a1 is included between a section line K1 perpendicular to the light incident surface 115 and the first direction y of the first light-facing surface 131a of each curved prism structure 130, an angle a1 is included between a section line K1 perpendicular to the light incident surface 115 and the first direction y of the first backlight surface 131b of each curved prism structure 130, and the angle a1 is different from the angle a 1. In other words, in the present embodiment, the first light facing surface 131a and the first backlight surface 131b of the curved prism structure 130 are asymmetric.

Referring to fig. 8 and 10, in the present embodiment, an angle a2 is included between a sectional line K2 perpendicular to the light incident surface 115 and the first direction y of the second light-facing surface 132a of each curved prism structure 130, an angle a2 is included between a sectional line K2 perpendicular to the light incident surface 115 and the first direction y of the second backlight surface 132b of each curved prism structure 130, and the angle a2 is different from the angle a 2. In other words, in the present embodiment, the second light-facing surface 132a and the second backlight surface 132b of the curved prism structure 130 are asymmetric.

Referring to fig. 8 and 9, in addition, in the present embodiment, an area of the first light-facing surface 131a of each curved prism structure 130 may be larger than an area of the first backlight surface 131b of the curved prism structure 130. Referring to fig. 8 and 10, in the present embodiment, an area of the second light-facing surface 132a of each curved prism structure 130 may be larger than an area of the second backlight surface 132b of the curved prism structure 130.

Referring to fig. 8, the plate body 110 of the light collecting type light guide plate 100A further has a fifth surface 116 opposite to the light incident surface 115 and connected to the first surface 111, the second surface 112, the third surface 113 and the fourth surface 114. In the present embodiment, the light beam L (refer to fig. 1) can enter the light collection type light guide plate 100A from the light incident surface 115, but does not enter the light collection type light guide plate 100A from the fifth surface 116. In other words, in the present embodiment, the backlight module including the light-collecting light guide plate 100A may be a single-side light-entering type backlight module. When the light-collecting light guide plate 100A is applied to a single-side light-entering backlight module, it is preferable that the area of the first light-facing surface 131a of the curved prism structure 130 is larger than the area of the first backlight surface 131b of the curved prism structure 130, and the area of the second light-facing surface 132a of the curved prism structure 130 is larger than the area of the second backlight surface 132b of the curved prism structure 130, but the utility model is not limited thereto. In another embodiment, when the light-collecting light guide plate 100A is applied in a dual-side light-entering backlight module (i.e., when the light beam L enters the light-collecting light guide plate 100A from the light-entering surface 115 and the fifth surface 116), it is preferable that the area of the first light-facing surface 131a of the curved prism structure 130 is equal to the area of the first backlight surface 131b of the curved prism structure 130, and the area of the second light-facing surface 132a of the curved prism structure 130 is equal to the area of the second backlight surface 132b of the curved prism structure 130, but the utility model is not limited thereto.

The light-collecting light guide plate 100B shown in fig. 11 and 12 is similar to the light-collecting light guide plate 100, and the difference between them is: the strip-shaped structures 120B and the curved prism structures 130B of the light-collecting light guide plate 100B are different from the strip-shaped structures 120 and the curved prism structures 130 of the light-collecting light guide plate 100.

Referring to fig. 11 and 12, in the present embodiment, the first inclined surface 121 and the second inclined surface 122 of the bar-shaped structure 120B are asymmetric, and the curved prism structure 130B disposed on the first inclined surface 121 and the second inclined surface 122 of the bar-shaped structure 120B is asymmetric. In detail, in the present embodiment, an angle Z1 is included between a sectional line C1 parallel to the light incident surface 115 (refer to fig. 2) and the second direction x of the first light-facing surface 131a of each curved prism structure 130B, an angle Z2 is included between a sectional line C2 parallel to the light incident surface 115 and the second direction x of the second light-facing surface 132a of each curved prism structure 130B, and the angle Z1 is different from the angle Z2. For example, in the present embodiment, the angle Z1 may be greater than the angle Z2. However, the utility model is not limited in this regard and in other embodiments, the angle Z1 may be less than the angle Z2.

Referring to fig. 13, in the present embodiment, each of the bar structures 120C further includes a top surface 123 connecting the first inclined surface 121 and the second inclined surface 122. The curved prism structure 130C extends from the first inclined surface 121 of the bar structure 120C to the second inclined surface 122 through the top surface 123. For example, in the present embodiment, a cross-section of the bar-shaped structure 120C parallel to the light incident surface 115 (refer to fig. 2) may be hexagonal. However, the present invention is not limited thereto, and in other embodiments, the shape of a cross section of the bar structures parallel to the light incident surface 115 (refer to fig. 2) may be other shapes. In addition, in the embodiment, the top surface 123 of the bar-shaped structure 120C has a dimension F in the second direction x, and 2 μm < F <500 μm, but the utility model is not limited thereto.

Fig. 14 is a schematic diagram illustrating a cross section parallel to the light incident surface of the strip-shaped structures 120D and the curved prism structures 130D of the light-collecting light guide plate according to another embodiment of the utility model.

Referring to fig. 14, in the present embodiment, each of the bar structures 120D further includes a top surface 123 connecting the first inclined surface 121 and the second inclined surface 122. The curved prism structure 130D extends from the first inclined surface 121 of the bar structure 120D to the second inclined surface 122 through the top surface 123. For example, in the embodiment, a cross section of the bar-shaped structure 120D parallel to the light incident surface 115 (refer to fig. 2) may be trapezoidal, but the utility model is not limited thereto. In addition, in the embodiment, the top surface 123 of the bar-shaped structure 120C has a dimension F in the second direction x, and 2 μm < F <500 μm, but the utility model is not limited thereto.

The curved prism structure 130E of fig. 15 is similar to the curved prism structure 130 of fig. 6, with the difference that: in the embodiment of fig. 6, a cross section of the curved prism structure 130 perpendicular to the light incident surface 115 (refer to fig. 2) is triangular in shape; in the embodiment of fig. 15, a cross-section of the curved prism structure 130E perpendicular to the light incident surface 115 (refer to fig. 2) is hexagonal in shape. In the embodiment of fig. 15, the curved prism structure 130E further includes a top surface 131c connecting the first light-facing surface 131a and the first backlight surface 131 b. In the embodiment of fig. 15, the top surface 131c has a dimension E in the first direction y, and 2 μm < E <500 μm, but the present invention is not limited thereto.

The curved prism structure 130F of fig. 16 is similar to the curved prism structure 130 of fig. 6, with the difference that: in the embodiment of fig. 6, a cross section of the curved prism structure 130 perpendicular to the light incident surface 115 (refer to fig. 2) is triangular in shape; in the embodiment of fig. 16, a cross section of the curved prism structure 130F perpendicular to the light incident surface 115 (refer to fig. 2) is trapezoidal in shape. In the embodiment of fig. 16, the curved prism structure 130F further includes a top surface 131c connecting the first light-facing surface 131a and the first backlight surface 131 b. In the embodiment of fig. 16, the top surface 131c has a dimension E in the first direction y, and 2 μm < E <500 μm, but the present invention is not limited thereto.

The light collecting type light guide plate 100G of fig. 17 is similar to the light collecting type light guide plate 100 of fig. 2, and the difference therebetween is: in the embodiment of fig. 17, the areas of the first light-facing surfaces 131a of the plurality of curved prism structures 130G are different from each other, and the areas of the second light-facing surfaces 132a of the plurality of curved prism structures 130G are different from each other.

Referring to fig. 17, in the present embodiment, in the same bar structure 120, areas of the first light-facing surfaces 131a of the plurality of curved prism structures 130G increase from the light-incident surface 115 to the light-incident surface 115 along the first direction y, and areas of the second light-facing surfaces 132a of the plurality of curved prism structures 130G on the same bar structure 120 increase from the light-incident surface 115 to the light-incident surface 115 along the first direction y.

For example, in the present embodiment, the area ratio between the first light-facing surface 131a and the first backlight surface 131b and the area between the second light-facing surface 132a and the second backlight surface 132b of the curved prism structure 130G may be changed, so that the area of the first light-facing surface 131a and the area of the second light-facing surface 132a are gradually increased from the light-entering surface 115 to the light-entering surface 115 along the first direction y. However, the utility model is not limited thereto, and in other embodiments, other manners may be adopted to increase the areas of the first light-receiving surface 131a and the second light-receiving surface 132a gradually from the light incident surface 115 to the light incident surface 115 along the first direction y; for example, in another embodiment, the overall size of the curved prism structure 130G may gradually increase from the light incident surface 115 to the light incident surface 115, so that the area of the first light facing surface 131a and the area of the second light facing surface 132a gradually increase from the light incident surface 115 to the light incident surface 115 along the first direction y.

The light-collecting light guide plate 100H of fig. 18 is similar to the light-collecting light guide plate 100 of fig. 2, and the difference therebetween is: in the embodiment of fig. 2, the bar structures 120 protrude from the board body 110, and the curved prism structures 130 protrude from the bar structures 120; in the embodiment of fig. 18, the stripe structures 120H are recessed into the plate body 110, and the curved prism structures 130H are recessed into the stripe structures 120H.

In summary, the light collecting type light guide plate according to an embodiment of the utility model includes a plate body, a plurality of strip structures, and a plurality of curved prism structures. Each strip-shaped structure comprises a first inclined surface and a second inclined surface which are opposite in inclined direction. Each bent prism structure is arranged on one of the corresponding strip structures, and two ends of each bent prism structure respectively extend to the first inclined plane and the second inclined plane of the strip structure. Each bent prism structure is provided with a first light receiving surface facing the light incoming surface of the plate body and connected with the first inclined surface, a first backlight surface facing the light incoming surface and connected with the first inclined surface, a second light receiving surface facing the light incoming surface and connected with the second inclined surface, and a second backlight surface facing the light incoming surface and connected with the second inclined surface. The angle of the included angle between the first light facing surface and the first inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees. The angle of the included angle between the second light facing surface and the second inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees. The first light-facing surface and the second light-facing surface are planes.

By means of the strip-shaped structure and the bent prism structure, the light-collecting light guide plate not only can concentrate the energy of light beams emitted from the light guide plate, but also can control the emitting angle of the light beams more finely, so that the light beams can be incident at a better incident angle by matching with a diaphragm used by the backlight module, and further the forward luminance of the backlight module is improved.

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 content 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 utility model to achieve all of the objects or advantages or features disclosed herein. Furthermore, the abstract and the title of the specification are provided to assist 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 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.

Claims

1. The light collecting type light guide plate is characterized by comprising a plate body, a plurality of strip-shaped structures and a plurality of bent prism structures, wherein the bent prism structures

The plate body is provided with a first surface, a second surface, a third surface, a fourth surface and a light incident surface, wherein the first surface faces away from the second surface, the third surface and the fourth surface are opposite to each other and are connected with the first surface and the second surface, and the light incident surface is connected with the first surface, the second surface, the third surface and the fourth surface;

the plurality of strip-shaped structures are formed on the first surface, extend along a first direction, and are arranged on the first surface along a second direction perpendicular to the first direction, wherein the first direction is perpendicular to the light incident surface, and each of the plurality of strip-shaped structures comprises a first inclined surface and a second inclined surface, wherein

The first inclined surface is inclined to the first surface and faces the third surface, wherein an included angle between the first inclined surface and the first surface is greater than or equal to 5 degrees and less than or equal to 60 degrees; and

the second inclined surface is inclined to the first surface and faces the fourth surface, wherein the direction in which the first inclined surface is inclined with respect to the first surface is opposite to the direction in which the second inclined surface is inclined with respect to the first surface, and the angle of the included angle between the second inclined surface and the first surface is greater than or equal to 5 degrees and less than or equal to 60 degrees; and

each of the plurality of curved prism structures is disposed on one of the plurality of bar structures and has two ends respectively extending to the first inclined plane and the second inclined plane of the one of the plurality of bar structures, each of the plurality of curved prism structures has a first light-facing surface facing the light-in surface and connected to the first inclined surface, a first backlight surface facing away from the light-in surface and connected to the first inclined surface, a second light-facing surface facing the light-in surface and connected to the second inclined surface, and a second backlight surface facing away from the light-in surface and connected to the second inclined surface, the angle of the included angle between the first light facing surface and the first inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees, the angle of the included angle between the second light facing surface and the second inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees, and the first and second light-facing surfaces of each of the plurality of curved prism structures are planar surfaces.

2. The light collecting light guide plate according to claim 1, wherein the first light receiving surface and the first backlight surface of each of the plurality of curved prism structures intersect with a first edge line, the second light receiving surface and the second backlight surface of each of the plurality of curved prism structures intersect with a second edge line, the first edge line and the second edge line intersect with the first direction, respectively, and the first edge line and the second edge line are connected.

3. The light collecting light guide plate according to claim 2, wherein the first inclined surface and the second inclined surface of each of the plurality of stripe structures intersect at a third ridge, and the third ridge is parallel to the first direction.

4. The light collecting light guide plate according to claim 1, wherein each of the plurality of stripe structures further comprises a top surface,

the top surface connects the first inclined surface and the second inclined surface, wherein each of the plurality of curved prism structures extends from the first inclined surface of the one of the plurality of stripe structures to the second inclined surface through the top surface.

5. The light collecting light guide plate according to claim 1, wherein the plurality of stripe structures comprise a first stripe structure, a second stripe structure and a third stripe structure sequentially arranged in the second direction, the plurality of curved prism structures are respectively disposed on the first stripe structure and the third stripe structure, the second stripe structure is not disposed with the plurality of curved prism structures, and the plurality of curved prism structures respectively disposed on the first stripe structure and the third stripe structure are separated by the second stripe structure.

6. The light-collecting light guide plate according to claim 5, wherein the plurality of curved prism structures respectively disposed on the first strip-shaped structures and the third strip-shaped structures extend to the second inclined planes and the first inclined planes of the second strip-shaped structures.

7. The light collecting light guide plate according to claim 1, wherein the first light facing surface of each of the plurality of curved prism structures encloses an angle Z1 with the second direction at a sectional line parallel to the light incident surface, the first light facing surface of each of the plurality of curved prism structures encloses an angle a1 with the first direction at a sectional line perpendicular to the light incident surface, and the angle Z1 is different from the angle a 1.

8. The light collecting light guide plate according to claim 7, wherein the second light facing surface of each of the plurality of curved prism structures encloses an angle Z2 with the second direction at a sectional line parallel to the light incident surface, the second light facing surface of each of the plurality of curved prism structures encloses an angle a2 with the first direction at a sectional line perpendicular to the light incident surface, and the angle Z2 is different from the angle a 2.

9. The light collecting light guide plate according to claim 1, wherein the first light facing surface of each of the plurality of curved prism structures forms an angle Z1 with the second direction at a sectional line parallel to the light incident surface, the second light facing surface of each of the plurality of curved prism structures forms an angle Z2 with the second direction at a sectional line parallel to the light incident surface, and the angle Z1 is different from the angle Z2.

10. The light collecting light guide plate according to claim 1, wherein the first light facing surface of each of the plurality of curved prism structures encloses an angle a1 with the first direction at a sectional line perpendicular to the light incident surface, the first backlight surface of each of the plurality of curved prism structures encloses an angle a1 with the first direction at a sectional line perpendicular to the light incident surface, and the angle a1 is different from the angle a 1.

11. The light collecting light guide plate according to claim 10, wherein the second light facing surface of each of the plurality of curved prism structures makes an angle a2 with the first direction at a sectional line perpendicular to the light incident surface, the second backlight surface of each of the plurality of curved prism structures makes an angle a2 with the first direction at a sectional line perpendicular to the light incident surface, and the angle a2 is different from the angle a 2.

12. The light collecting light guide plate according to claim 1, wherein areas of the first light facing surfaces of the curved prism structures are different from each other, and areas of the second light facing surfaces of the curved prism structures are different from each other.

13. The light collecting light guide plate according to claim 1, wherein the number of the plurality of curved prism structures on the one of the plurality of bar structures is plural, the areas of the first light facing surfaces of the plurality of curved prism structures on the one of the plurality of bar structures gradually increase from near the light incident surface to far from the light incident surface along the first direction, and the areas of the second light facing surfaces of the plurality of curved prism structures gradually increase from near the light incident surface to far from the light incident surface along the first direction.

14. The light collecting light guide plate according to claim 1, wherein the arrangement density of the plurality of curved prism structures increases from near the light incident surface to far from the light incident surface along the first direction.

15. The light collecting light guide plate according to claim 1, wherein an area of the first light facing surface of each of the plurality of curved prism structures is greater than or equal to an area of the first backlight surface of each of the plurality of curved prism structures, and an area of the second light facing surface of each of the plurality of curved prism structures is greater than or equal to an area of the second backlight surface of each of the plurality of curved prism structures.

16. The light-collecting light-guiding plate according to claim 1, wherein each of the plurality of curved prism structures is arranged in mirror symmetry with a central axis of each of the plurality of stripe structures as a symmetry axis.

17. The light collecting light guide plate according to claim 1, wherein an angle of an included angle between the first inclined plane and the first surface is equal to an angle of an included angle between the second inclined plane and the first surface.

18. The light collecting light guide plate according to claim 1, wherein the plurality of stripe structures are recessed into the plate body.

19. The light collecting light guide plate according to claim 1, wherein the plurality of stripe structures protrude from the plate body.

20. A backlight module comprises a light-collecting light guide plate, a light source and at least one film

The light-collecting light guide plate comprises a plate body, a plurality of strip structures and a plurality of bent prism structures, wherein

the plurality of strip-shaped structures are formed on a structure surface, extend along a first direction and are arranged on the structure surface along a second direction perpendicular to the first direction, wherein the structure surface is the first surface or the second surface, the first direction is perpendicular to the light incident surface, and each strip-shaped structure comprises a first inclined surface and a second inclined surface, wherein each strip-shaped structure comprises a first inclined surface and a second inclined surface

The first inclined surface is inclined to the structural surface and faces the third surface, wherein an included angle between the first inclined surface and the structural surface is greater than or equal to 5 degrees and less than or equal to 60 degrees; and

the second inclined plane is inclined to the structural plane and faces the fourth surface, wherein the direction in which the first inclined plane is inclined with respect to the structural plane is opposite to the direction in which the second inclined plane is inclined with respect to the structural plane, and the angle of the included angle between the second inclined plane and the structural plane is greater than or equal to 5 degrees and less than or equal to 60 degrees; and

each of the plurality of curved prism structures is disposed on one of the plurality of bar structures and has two ends respectively extending to the first inclined plane and the second inclined plane of the one of the plurality of bar structures, each of the plurality of curved prism structures has a first light-facing surface facing the light-in surface and connected to the first inclined surface, a first backlight surface facing away from the light-in surface and connected to the first inclined surface, a second light-facing surface facing the light-in surface and connected to the second inclined surface, and a second backlight surface facing away from the light-in surface and connected to the second inclined surface, the angle of the included angle between the first light facing surface and the first inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees, the angle of the included angle between the second light facing surface and the second inclined surface is greater than or equal to 5 degrees and less than or equal to 45 degrees, and the first and second light-facing surfaces of each of the plurality of curved prism structures are planar surfaces;

the light source is arranged on the light incident surface of the plate body to provide light beams; and

wherein the second surface is located between the first surface and the at least one diaphragm.