TW201539087A - Optical assembly and back light module - Google Patents

Abstract

An optical assembly including an optical lens and a light-emitting component is provided. The optical lens includes a central portion and two light-emitting portions, and thicknesses of the light-emitting portions are larger than a thickness of the central portion. The optical lens has a central axis and a light-incident region corresponding to the central axis. The central axis is located on a first reference plane and passes through the central portion. Each of the light-emitting portions has a reflecting surface, a light-emitting surface and a bottom surface. The light-emitting surface is connected with the reflecting surface and the bottom surface opposite to each other and adjacent to the central portion respectively. The light-emitting component is located on the central axis, faces to the light-incident region, and is adapted to emit a light toward the optical lens. A back light module including the optical assembly aforementioned is also provided.

Description

Optical component and backlight module

The present invention relates to an optical component, and more particularly to a backlight module to which the optical component is applied.

In recent years, as electronic products have become more and more popular, display devices that play an important role in electronic products, such as liquid crystal displays (LCDs), have been the focus of designers. The display device usually includes a display panel, and some types of display panels do not have a light-emitting function. Therefore, they are usually used together with a backlight module, wherein the backlight module is suitable as a surface light source and is set. Below the display panel, light is provided to the display panel to achieve the display function.

FIG. 1 is a schematic diagram of a conventional backlight module. Referring to FIG. 1 , a common backlight module 10 is configured with a light source 14 arranged in a two-dimensional matrix on a hollow frame 12 to form a surface light source to provide a large area of light to a display panel (not shown). Each of the light sources 14 is composed of a plurality of light-emitting elements 14a, for example, light emitting diode (LED) elements, which are sequentially disposed on a printed circuit board (PCB) 14b. In addition, the light-emitting element 14a can be placed above the demand The optical lens 14c is disposed, and the inner side of the hollow frame 12 can also be configured with a reflective module to reflect the light of the light source 14 to the outside of the hollow frame 12.

In the large-sized display device, in order to provide the backlight module 10 with a large area and a sufficient amount of light, the above-mentioned design requires a large amount of the light-emitting element 14a and the circuit board 14b. Taking a common 65-inch backlight module as an example, it requires 7 to 8 circuit boards 14b and about 144 light-emitting elements 14a. As such, the backlight module 10 is relatively expensive. Further, the conventional optical lens 14c can guide the light of the light-emitting element 14a only to one main light-emitting direction. For example, the optical lens 14c illustrated in FIG. 1 guides the light of the light-emitting element 14a toward the upper side of FIG. Therefore, if the number of the light sources 14 is reduced in order to save the manufacturing cost, the backlight module 10 may cause a problem of uneven light.

The present invention provides an optical component having a bidirectional light output function.

The invention provides a backlight module, which has a uniform light-emitting effect and can reduce the manufacturing cost thereof.

The optical assembly of the present invention includes an optical lens and a light emitting element. The optical lens includes an intermediate portion and two light exiting portions located on opposite sides of the intermediate portion, and each of the light exiting portions has a thickness greater than a thickness of the intermediate portion. The optical lens has a central axis and a light entrance region, the central axis is located on a first reference plane and passes through the intermediate portion, and the light incident region corresponds to the central axis. Each of the light exiting portions has a reflecting surface, a light emitting surface and a bottom surface. The light-emitting surface is connected to the opposite reflecting surface and the bottom surface, and the reflecting surface and the bottom surface are respectively adjacent to the middle And the bottom surface is adjacent to the light zone. The light-emitting element is located on the central axis and faces the light-in area. The illuminating element is adapted to emit a light toward the optical lens, wherein after the light enters the optical lens from the light entering region, part of the light is reflected on the corresponding reflecting surface and is emitted from the corresponding light emitting surface.

The backlight module of the present invention comprises a hollow frame, a reflective module and a plurality of optical components. The hollow frame has an accommodation space. The reflection module is disposed on the inner side of the hollow frame. The optical component is disposed on the reflective module and located in the accommodating space, and the optical components are arranged along a center line of the hollow frame. Each optical component includes an optical lens and a light emitting element. The optical lens comprises an intermediate portion and two light exiting portions located on opposite sides of the intermediate portion, and each of the light exiting portions has a thickness greater than a thickness of the intermediate portion, wherein the optical lens has a central axis and a light incident region, and the central axis is located at The first reference plane passes through the intermediate portion, and the light incident region corresponds to the central axis. Each of the light exiting portions has a reflecting surface, a light emitting surface and a bottom surface. The light-emitting surface is connected to the opposite reflecting surface and the bottom surface, and the reflecting surface and the bottom surface are respectively adjacent to the intermediate portion, and the bottom surface is adjacent to the light-incident region. The light-emitting element is located on the central axis and faces the light-in area. The illuminating element is adapted to emit a light towards the optical lens. After the light enters the optical lens from the light entering area, part of the light is reflected on the corresponding reflecting surface, and is emitted from the corresponding light emitting surface, and the light emitted from the optical lens is reflected by the reflective module and then emitted through the opening into the hollow frame.

In an embodiment of the invention, the optical lens has a recess located in the light entrance region and the light enters the optical lens from the recess.

In an embodiment of the invention, the central axis is further located on a second reference plane, and the recess has at least two sides on the second reference plane. Each side Face the corresponding light exit.

In an embodiment of the invention, the groove is symmetric along the first reference plane, and the two sides of the groove are symmetric along the central axis on the second reference plane.

In an embodiment of the invention, the two light exiting portions are symmetric along the first reference plane, and the two light exiting portions are symmetric along the central axis on the second reference plane.

In an embodiment of the invention, each of the two light exiting portions extends outward from the corresponding intermediate portion along an axial direction. The axial direction is perpendicular to the corresponding central axis and the axial direction passes through the corresponding two light exiting faces.

In an embodiment of the invention, a reflecting unit is disposed on a bottom surface of each of the light emitting portions. After the light enters the optical lens from the corresponding light entering region, part of the light is reflected by the reflecting unit on the corresponding bottom surface, and is emitted from the corresponding light emitting surface.

In an embodiment of the invention, each of the reflecting surfaces is a curved surface, and each of the light emitting surfaces is a flat surface, and an edge between each of the light emitting surfaces and the corresponding reflecting surface is a smooth curve.

In an embodiment of the present invention, the thickness of each of the light-emitting portions is gradually increased from an end of each of the light-emitting portions adjacent to the corresponding intermediate portion toward the other end of each of the light-emitting portions away from the corresponding intermediate portion.

In an embodiment of the present invention, the backlight module further includes a plurality of auxiliary light-emitting elements disposed on the reflective module and located in the accommodating space, and each of the auxiliary light-emitting elements is disposed correspondingly along the center line. Between two adjacent optical components.

In an embodiment of the invention, the light-emitting elements each have a first light intensity, and the auxiliary light-emitting elements each have a second light intensity, and the first light intensity Greater than the second light intensity.

In an embodiment of the invention, the reflective module includes a bottom reflective sheet and a plurality of side reflective sheets. The bottom reflective sheet is disposed on a bottom wall of the hollow frame, and the optical component is disposed on the bottom reflective sheet. The side reflection sheets are disposed on the plurality of side walls of the hollow frame, wherein the side walls are erected on the periphery of the bottom wall and constitute an accommodation space, and the two light exit portions of the optical lenses respectively face opposite ones of the side reflection sheets.

In an embodiment of the invention, the bottom reflective sheet comprises a first material region and two second material regions. The first material region is adjacent to the optical component, and each of the second material regions is respectively located between one of the side reflection sheets and the first material region, and the specular reflection ratio of the first material region is greater than the specular reflection ratio of the second material region. .

Based on the above, the optical lens used in the optical module of the present invention includes the intermediate portion and the two light exiting portions located on opposite sides of the intermediate portion, and the thickness of each of the light exit portions is greater than the thickness of the intermediate portion. In this way, the light emitted by the light-emitting element enters the optical lens from the light-input region corresponding to the intermediate portion, so that part of the light is emitted from the light-emitting surfaces of the two light-emitting portions. Accordingly, the optical module of the present invention has a bidirectional light-emitting function. Furthermore, the backlight module of the present invention has a plurality of the above-described optical components disposed along a center line of the hollow frame on a reflective module located in the hollow frame. In this way, the light emitted by each of the light-emitting elements of the optical component can be emitted from the two light-emitting portions of the optical lens, and is reflected by the reflective module to be emitted out of the hollow frame. Accordingly, the backlight module of the present invention has a uniform light-emitting effect and can reduce the manufacturing cost thereof.

The above described features and advantages of the invention will be apparent from the following description.

10, 50, 50a‧‧‧ backlight module

12, 52‧‧‧ hollow frame

14‧‧‧Light source

14a, 120‧‧‧Lighting elements

14b, 54‧‧‧ boards

14c, 110‧‧‧ optical lens

52a‧‧‧ accommodating space

52b‧‧‧Diffuse film

52c‧‧‧ bottom wall

52d‧‧‧ side wall

53‧‧‧Reflective Module

53a‧‧‧ bottom reflection sheet

53b‧‧‧ side reflector

56‧‧‧Auxiliary light-emitting elements

100‧‧‧Optical components

112‧‧‧Intermediate

112a‧‧‧Center axis

112b‧‧‧Into the light zone

114‧‧‧Lighting Department

114a‧‧‧reflecting surface

114b‧‧‧Glossy

114c‧‧‧ bottom

116‧‧‧ Groove

116a, 116b‧‧‧ side

118‧‧‧Reflective unit

122‧‧‧Lighting surface

C1‧‧‧ center line

L11, L12, L13, L14, L31, L32, L33‧‧‧ ray paths

P‧‧‧ spacing

R1‧‧‧First Material Area

R2‧‧‧Second material area

T1, T2‧‧‧ thickness

FIG. 1 is a schematic diagram of a conventional backlight module.

2 is a perspective view of an optical component in accordance with an embodiment of the present invention.

3 is a side elevational view of the optical assembly of FIG. 2.

4A is a schematic illustration of the illumination field of the optical assembly of FIG. 2 in a first reference plane.

4B is a graphical illustration of the results of the illumination field of FIG. 4A at different viewing angles.

FIG. 5 is a perspective view of a backlight module according to an embodiment of the present invention.

6 is a side elevational view of the backlight module of FIG. 5.

FIG. 7 is a partial top plan view of a backlight module according to another embodiment of the present invention.

Figure 8 is a line graph of the pitch of the light-emitting elements of Figure 7 versus the ratio of the second light intensity to the first light intensity.

2 is a perspective view of an optical component in accordance with an embodiment of the present invention. 3 is a side elevational view of the optical assembly of FIG. 2. Referring to FIG. 2 and FIG. 3 , in the embodiment, the optical component 100 includes an optical lens 110 and a light emitting element 120 . The optical lens 110 includes an intermediate portion 112 and two light exit portions 114 located on opposite sides of the intermediate portion 112, and a thickness T1 of each of the light exit portions 114 is greater than a thickness T2 of the intermediate portion 112. The optical lens 110 has a central axis 112a and a light incident region 112b. The central axis 112a is located at the first reference plane And the second reference plane passes through the intermediate portion 112, and the light incident region 112b corresponds to the central axis 112a. Each of the light exiting portions 114 has a reflecting surface 114a, a light emitting surface 114b, and a bottom surface 114c. The light-emitting surface 114b connects the opposite reflecting surface 114a and the bottom surface 114c. The reflecting surface 114a and the bottom surface 114c respectively adjoin the intermediate portion 112, and the bottom surface 114c abuts the light incident region 112b. The light emitting element 120 is disposed below the optical lens 110 and is positioned on the central axis 112a and faces the light incident region 112b. Light emitting element 120 is adapted to emit light toward optical lens 110. Furthermore, the light-emitting element 120 is, for example, a light-emitting diode element or other suitable light-emitting element, and the light-emitting surface 122 of the light-emitting element 120 faces the light-incident region 112b, and the normal line of the light-emitting surface 122 overlaps the central axis 112a. In this manner, the light-emitting element 120 can emit light by the central axis 112a being the main light-emitting direction, and the light emitted by the light-emitting element 120 can pass through the optical lens 110 to adjust the light-emitting path thereof, thereby changing the main light-emitting direction of the optical component 100.

Specifically, in the present embodiment, if the optical component 100 is placed on the XY plane of the space coordinate system XYZ and the central axis 112a of the optical lens 110 is superposed on the Z axis, the first reference plane is XZ. In the plane, the second reference plane is the YZ plane, and the central axis 112 overlapping the Z-axis is located on the first reference plane (ie, the XZ plane) and the second reference plane (ie, the YZ plane). Thus, in the present embodiment, the two light exit portions 114 are symmetric along the first reference plane (ie, the XZ plane), and the two light exit portions 114 are symmetric along the central axis 112a on the second reference plane (ie, the YZ plane). Further, the two light exit portions 114 each extend from the intermediate portion 112 in an axial direction (for example, the Y axis), wherein the axial direction (Y axis) is perpendicular to the central axis 112a (corresponding to the Z axis), and the axial direction (Y axis) ) passes through the two exit faces 114b. Furthermore, each light exiting unit The thickness T1 of the 114 is greater than the thickness T2 of the intermediate portion 112, and the thickness T1 of each of the light exit portions 114 gradually increases from the end of each of the light exit portions 114 adjacent to the intermediate portion 112 toward the other end of each of the light exit portions 114 away from the intermediate portion 112. In other words, the optical lens 110 has a minimum thickness at the intermediate portion 112, and the middle portion (i.e., the intermediate portion 112) of the optical lens 110 assumes a neck shape. In contrast, the optical lens 110 has a maximum thickness at one end of each of the light exiting portions 114 away from the intermediate portion 112, and the opposite sides of the optical lens 110 (ie, the two light exiting portions 114) are gradually enlarged from the inside to the outside along the Y axis.

Further, in the present embodiment, the optical lens 110 has a recess 116 which is located in the light incident region 112b. The groove 116 has a structure such as a conical or similar projectile hole, but has a continuous inner surface, and the inner surface is a curved surface. Therefore, when light enters the optical lens 110 via the groove 116, the light will enter the optical lens 110 after being refracted on the inner surface of the groove 116. Specifically, since the groove 116 of the present embodiment has a structure such as a conical shape or a similar bullet hole, the groove 116 has at least two on a cross section, for example, on a second reference plane (ie, a YZ plane). Sides 116a and 116b. When the groove 116 has a conical structure, the side edges 116a and 116b are straight lines (as shown in FIG. 3), and when the groove 116 is a structure similar to a bullet hole (not shown), the side edges 116a and 116b. For the purpose of the curve, the invention is not limited thereto. Each of the side edges 116a and 116b positioned on the second reference plane (i.e., the YZ plane) faces the corresponding light exit portion 114, respectively. Each of the side edges 116a and 116b is respectively at an acute angle with the central axis 112a such that the recess 116 is retracted from the light incident region 112b away from the light emitting element 120, thereby causing the recess 116 to have a conical or bullet-like structure.

In the present embodiment, the ratio of the dimensions of the groove 116 on the X-axis and the Y-axis It is between 0.75 and 5, preferably 1.9, but the invention is not limited thereto. Thus, the light emitted by the light-emitting element 120 corresponding to the central axis 110 can enter the two light-emitting portions 114 from the groove 116 located in the light-incident region 112b, and on the inner surface of the groove 116 (for example, the side edges 116a and 116b). After being refracted, it is incident on the corresponding reflecting surface 114a. In addition, the groove 116 of the present embodiment exhibits symmetry along the first reference plane (ie, the XZ plane), and the two side edges 116a and 116b of the groove 116 are symmetric along the central axis 112a on the second reference plane (ie, the YZ plane). (As shown in Figure 3). Therefore, the amount of light entering the two light exit portions 114 from the groove 116 is substantially the same. Although the recess 116 of the present embodiment is exemplified by a conical shape and has a triangular shape in the cross-sectional view (as shown in FIG. 3), in other embodiments, the recess may be a cylindrical shape, a semi-spherical shape, or a semi-elliptical shape. A spherical or similar structure of a bullet hole, and presents a rectangle, a ladder, a circle, an ellipse, or a parabola in a cross-sectional view. The invention does not limit the shape of the recess, which can be adjusted as needed.

On the other hand, in the present embodiment, each of the reflecting surfaces 114a may be a curved surface to cause light to be reflected on the reflecting surface 114a, and more preferably to generate total reflection. In contrast, each of the light-emitting surfaces 114b and each of the bottom surfaces 114c may be a flat surface, and an edge between each of the light-emitting surfaces 114b and the corresponding reflective surface 114a may be a smooth curve (for example, a circular arc line). However, the invention is not limited thereto, and it can be adjusted as needed. Thus, after the light emitted by the light-emitting element 120 corresponding to the central axis 112a (Z-axis) enters the optical lens 110 from the light-incident region 112b located at the intermediate portion 112, most of the light can be on the reflective surface 114a of the light-emitting portion 114. Total reflection is generated, and is emitted from the optical lens 110 from the light-emitting surface 114 of the two light-emitting portions 114 with the Y-axis as the main light-emitting direction. Accordingly, the optical component 100 of the present embodiment can guide the light to have a bidirectional light output function.

Further, in the present embodiment, the maximum circumference of each of the light-emitting portions 114 (the length of the outer contour of each of the light-emitting surfaces 114b) is about 1.8 of the circumference of the intermediate portion 112 (the length of the outer contour of the intermediate portion 112). Doubled to 4.2 times. In addition, the ratio of the maximum dimension of the optical lens 110 on the X-axis (the length of the edge between the light-emitting surface 114b and the bottom surface 114c) to the maximum dimension of the optical lens 110 on the Z-axis (the maximum height of the light-emitting surface 114b) is Between 0.9 and 3, preferably 1.3. However, the invention is not limited thereto, and it can be adjusted as needed. Through the above design, the optical lens 110 of the present embodiment can not only guide the light emitted by the light-emitting element 120, but also the optical component 100 has the function of emitting light on both sides, and the optical lens 110 can also make the light emitted by the light-emitting element 120. A specific illuminating field pattern is formed.

For example, FIG. 4A is a schematic diagram of an illumination field of the optical component of FIG. 2 in a first reference plane, and FIG. 4B is a schematic diagram of a result of illumination field of FIG. 4A at different viewing angles, please refer to FIG. 4A and FIG. 4B. The optical lens 110 of the present embodiment can form light into a specific illumination field type, wherein FIG. 4A is a schematic diagram of the illumination field of the optical assembly 100 in a first reference plane (ie, an XZ plane), and the graph of FIG. 4B is a diagram. The result of the 4A luminescence field at different viewing angles is converted into a schematic diagram of the curve. As seen from FIG. 4A, the illuminating field type of the optical module 100 of the present embodiment has a smaller amount of light in the vertical direction (i.e., the Z-axis) than in the horizontal direction (i.e., the X-axis). In other words, the amount of light of the optical component 100 is concentrated in the horizontal direction (i.e., the X-axis). According to this, it can be seen that the light of the optical component 100 of the present embodiment has the extending direction of the light exiting portion 114 (ie, the Y axis) as the main light emitting direction, and is concentrated in a specific angular range in the horizontal direction. In addition, as seen from FIG. 4B, the horizontal axis of FIG. 4B is an optical lens. The angle of 110 in the YZ plane (from -90 degrees to 90 degrees), the vertical axis is the luminous intensity, and the four curves in Fig. 4B represent the luminous field of the optical lens 110 at 0, 45, 90 and 135, respectively. A schematic curve converted from the result of the degree of view. Through the above design, the optical lens 110 can make the full width half maximum (FWHM) of the angular distribution of the illuminating field of the light in the YZ plane smaller than 15 degrees, and the projection of the peak vector on the YZ plane with the X axis ( The inner product value corresponding to the central axis 112a) is between -0.1736 and 0.1736. Further, taking a schematic curve of a 0 degree angle of view as an example, the peak of the luminous intensity falls at an angle of -2 degrees. It can be seen that most of the light rays emitted from the optical lens 110 are deflected toward the XY plane (that is, the light is emitted downward toward both sides of the optical lens 110), and the light-emitting field pattern is flat (as shown in FIG. 4A). ). The above-described illuminating field type allows the optical component 100 to have a good light-emitting effect, but the present invention is not limited to the above numerical range.

Furthermore, referring again to FIG. 3, the optical lens 110 used in the optical component 100 of the present embodiment is a solid lens, for example, polycarbonate (PC), polyethylene (PE), methacrylic acid. Made of transparent plastic materials such as methylmethacrylate-styrene (MS), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), or glass. However, it is not limited to the above materials. In other words, the light emitted by the light-emitting element 120 is transmitted in the same medium (solid optical lens 110) from the time of entering the optical lens 110 to before exiting the optical lens 110. Accordingly, the optical lens 110 can guide the light emitted by the light-emitting element 120 to form a specific light-emitting field type (as described above), and The light can be totally reflected at the intersection of the optical lens 110 and the air (for example, the reflecting surface 114a), so that the light is continuously transmitted forward in the direction of the light exiting portion 114 until it exits the optical lens 110 through the light emitting surface 114b, as shown in FIG. The light path L11 and L12. Therefore, the optical lens 110 used in the optical component 100 of the present embodiment can make the light incident on the reflective surface 114a at a large angle, and the light emitted from the light-emitting surface 114b after being reflected by the reflective surface 114a tends to the plane where the bottom surface 114c is located ( The XY plane), and therefore, the optical component 100 does not cause a large angle of light leakage from the plane (XY plane) where the bottom surface 114c is located, as shown in the specific illumination pattern of FIG. 4A.

In addition, referring to FIG. 3, in the present embodiment, the bottom surface 114c of each light exiting portion 114 is provided with a reflecting unit 118. As described above, after the light emitted from the light-emitting element 120 enters the optical lens 110 from the light-incident region 112b, most of the light can be emitted from the light-emitting surface 114b of the two light-emitting portions 114 with the Y-axis as the main light-emitting direction. However, the above-mentioned main light-emitting direction means a direction in which the amount of light is relatively large, and the light is not limited to be emitted only by the light-emitting surface 114b of the two light-emitting portions 114 along the Y-axis. A small amount of light may be emitted from a portion other than the light-emitting surface 114b, for example, from the reflection surface 114a (such as the light path L13) of the light-emitting portion 114, the bottom surface 114c, or the intermediate portion 112. Since the brightness of the light emitted from the light-emitting surface 114b is greater than the brightness of the light emitted from the light-emitting surface 114b, the optical lens 110 can be regarded as having the two light-emitting portions 114 as the main light-emitting interface and the Y-axis as the main light-emitting direction. Accordingly, in order to increase the amount of light emitted from the light-emitting surface 114b of the two light-emitting portions 114 of the optical unit 100, in the present embodiment, the reflection unit 118 is disposed on the bottom surface 114c of each of the light-emitting portions 114. Thus, after the light enters the optical lens 110 from the light entering region 112b, part of the light is on the bottom surface 114c. It is reflected by the reflection unit 118 and emitted from the corresponding light-emitting surface 114b, such as the light path L14 of FIG. In the present embodiment, the reflecting unit 118 may be a reflective sheet attached to the bottom surface 114c or a reflective material coated on the bottom surface 114c. Alternatively, the optical lens 110 can also be fabricated directly on the bottom surface 114c. The invention does not limit the type and configuration of the reflective unit 118.

FIG. 5 is a perspective view of a backlight module according to an embodiment of the present invention. 6 is a side elevational view of the backlight module of FIG. 5. Referring to FIG. 1 , FIG. 5 and FIG. 6 , in the embodiment, the backlight module 50 includes a hollow frame 52 , a reflective module 53 , and a plurality of optical components 100 . The hollow frame 52 has an accommodation space 52a. In addition, the hollow frame 52 further has a diffusion sheet 52b (shown in FIG. 6) for shielding the accommodating space 52a. The reflection module 53 is disposed inside the hollow frame 52, for example, on the inner surface of the hollow frame 52. The optical component 100 is disposed on the reflective module 53 and located in the accommodating space 52a, and the optical components 100 are arranged along the center line C1 of the hollow frame 52. For the composition and structure of each optical component 100, please refer to the foregoing content and FIG. 1, which will not be further described herein. After the light emitted by the light-emitting element 120 of each optical component 100 enters the optical lens 110 from the light-incident region 112b of the corresponding optical lens 110, part of the light is reflected by the corresponding reflective surface 114a and is emitted from the corresponding light-emitting surface 114b. In this way, each optical component 100 can use the extending axial direction of the two light exiting portions 114 as the main light emitting direction. For example, if the backlight module 50 is placed on the XY plane of the space coordinate system XYZ and the central axis 112a of the optical lens 110 is overlapped with the Z axis, the extending directions of the two light exit portions 114 are overlapped with the Y axis. The center line C1 of the hollow frame 52 is overlapped with the X axis. As such, each optical component 100 has a Y-axis as the main light-emitting direction. Each optical component 100 After the light is emitted through the corresponding two light exit portions 114, the optical path thereof faces the opposite sides of the optical component 110 and is biased downward (ie, the XY plane). Therefore, the reflective module 53 is preferably located at the periphery and below of the optical component 100, such as the bottom reflective sheet 53a and the plurality of side reflective sheets 53b in the present embodiment, and the light emitting element 120 of the optical assembly 100 is from the optical lens. The light emitted by the light is reflected by the reflection module 53 and then emitted through the diffusion sheet 52b to exit the hollow frame 52. In this way, the backlight module 50 can form a surface light source, and has a Z-axis as a main light-emitting direction, and has a uniform light-emitting effect.

Specifically, in the embodiment, the backlight module 50 further includes a circuit board 54 disposed in the accommodating space 52a and extending along the center line C1. The light emitting element 120 of the optical component 100 is disposed on the circuit board 54 and electrically connected to the circuit board, and the optical lens 110 is disposed on the corresponding light emitting element 120. As such, the optical assembly 100 and the circuit board 54 form a light bar. The light bar is disposed on the reflective module 53 and located in the accommodating space 52a, and the light bar extends along the center line C1 (corresponding to the X axis). The backlight module 50 is adapted to drive the light-emitting element 120 to emit light through the circuit board 54 by a driving component (not shown), and the light emitted by the light-emitting component 120 is guided by the corresponding optical lens 110 to face the Y-axis as the main light-emitting direction. The opposite sides of the accommodating space 52a are emitted, and are reflected by the reflection module 53 to emit the hollow frame 52 with the Z-axis as the main light-emitting direction. In other words, since the optical component 100 used in the embodiment has the function of bidirectional light emission, the optical component 100 is disposed on the center line C1 of the hollow frame 52 and the optical component 100 is disposed in the accommodating space 52a of the hollow frame 52. The opposite sides of the light. In this manner, the light is emitted from the hollow frame 52 through the reflection of the reflection module 53, thereby forming a surface light source. So compared to the common back The backlight module 50 of the present embodiment has a low demand for the circuit board 54 and the light-emitting component 120. For example, the backlight module 50 can have only one circuit board 54, thereby reducing the backlight. The manufacturing cost of the module 50. Furthermore, the light-emitting element 120 is guided by the corresponding optical lens 110 to become an optical component 100 that emits light in both directions. Thus, the light of the optical component 100 used in this embodiment can be reflected by the reflective module 53 before being emitted from the hollow frame 52, as compared with the light-emitting component 14a of the conventional backlight module 10, which is directly emitted toward the outside of the hollow frame 10. Therefore, the light of the optical component 100 can be mixed in the accommodating space 52a, and uniformly diffused out of the hollow frame 52 through the diffusion of the diffusion sheet 52b. Accordingly, even if only one light bar is disposed in the backlight module 50 of the embodiment, a uniform light emitting effect can be obtained.

However, the present invention does not limit the number of circuit boards 54. For example, when the size of the backlight module 50 is large, two or more circuit boards 54 may be disposed in the hollow frame 52 of the backlight module 50, and the circuit board 54 forms a light bar with the optical component 100 disposed thereon. In order to make the backlight module 50 have sufficient brightness. Taking the two circuit boards 54 as an example, the circuit board 54 and the optical component 100 disposed thereon may be disposed on the center line C1 of the hollow frame 52, for example, two light bars formed by the optical component 100 and the two circuit boards 54. Side by side on the center line C1. Moreover, in order to avoid that the optical module 100 is disposed on the center line C1 and the backlight module 50 generates a distinct bright line corresponding to the center line C1, the light strip formed by the optical component 100 and the circuit board 54 may also be slightly Adjusted to opposite sides of the center line C1, wherein the backlight module 50 can be divided into two portions that are substantially equal, and respectively correspond to one of the light bars. In this way, the backlight module can avoid forming a distinct bright line at the center line C1, and has a uniform light-emitting effect.

On the other hand, in the present embodiment, the reflection module 53 includes a bottom reflection sheet 53a and a plurality of side reflection sheets 53b. Specifically, the hollow frame 52 of the present embodiment has a bottom wall 52c and a plurality of side walls 52d, wherein the side wall 52d is erected on the periphery of the bottom wall 52c and constitutes the accommodating space 52a. The diffusion sheet 52b is disposed on the side wall 52d and faces the bottom wall 52c to shield the accommodation space 52a. The bottom reflection sheet 53a is disposed on the bottom wall 52c of the hollow frame 52. The side reflection sheet 53b is disposed on the side wall 52d of the hollow frame 52, and is erected on the periphery of the bottom reflection sheet 53a. The light strips formed by the optical component 100 and the circuit board 54 are disposed on the bottom reflective sheet 53a, and the two light exiting surfaces 114b of the optical lenses 110 respectively face opposite sides of the side reflective sheet 53b. In this manner, after the light emitted from the optical lens 110 is reflected by the bottom reflection sheet 53a and the side reflection sheet 53b, the light can be mixed in the accommodating space 52a of the hollow frame 52 and then emitted out of the hollow frame 52, as shown in FIG. The path to L33 further causes the backlight module 52 to generate a surface light source.

Further, in the present embodiment, the bottom reflection sheet 53a includes the first material region R1 and the two second material regions R2. The first material region R1 is adjacent to the optical component 100, and each of the second material regions R2 is located between one of the side reflection sheets 53b and the first material region R1. In other words, the second material region R2 is located on opposite sides of the first material region R1. Further, in the present embodiment, the specular reflection ratio of the first material region R1 is larger than the specular reflection ratio of the second material region R2. The specular reflection ratio refers to the ratio of the specularly reflected light generated by the light in the material region to the sum of the specularly reflected light and the scattered reflected light. For example, the bottom reflective sheet 53a may be composed of different materials in the first material region R1 and the second material region R2, respectively, or the bottom reflective sheet 53a may be configured with another reflective material on the first material region R1 to make the bottom reflection Specular reflection of sheet 53a in first material region R1 The ratio is larger than the specular reflection ratio of the bottom reflection sheet 53a in the second material region R2. Thus, when the light of the optical component 100 is emitted to the first material region R1, the light can be transmitted with a better specular reflection effect, such as the light path L31 of FIG. 6, and when the light is emitted to the second material region R2. At this time, the light can be preferably scattered to improve the light extraction efficiency, such as the light path L32 of FIG. In this way, the light can be better reflected by the reflection of the reflective module 53 in the hollow frame 52, so that the backlight module 50 has a uniform light-emitting effect.

FIG. 7 is a partial top plan view of a backlight module according to another embodiment of the present invention. Referring to FIG. 5 and FIG. 7 , in the embodiment, the backlight module 50 a has a similar structure and function to the backlight module 50 , and the main difference is that the backlight module 50 a of the embodiment further includes multiple auxiliary functions. Light-emitting element 56. The auxiliary light-emitting element 56 is disposed on the reflective module 53 and located in the accommodating space 52a of the hollow frame 52, and the auxiliary light-emitting element 56 is disposed between each two adjacent optical components 100 correspondingly along the center line C1. Specifically, in the present embodiment, the optical components 100 are arranged along the center line C1 and spaced apart from each other by a predetermined interval. Therefore, in order to prevent the backlight module 50a from generating a dark spot between every two adjacent optical components 100, the auxiliary light-emitting element 56 is correspondingly disposed between each two adjacent optical components 100 in this embodiment. As such, the dark spots between the optical components 100 can be compensated by the light of the auxiliary light-emitting elements 56, so that the backlight module 50a has a relatively uniform light-emitting effect.

Furthermore, in the present embodiment, the light-emitting elements 120 of the optical component 100 each have a first light intensity, and the auxiliary light-emitting elements 56 each have a second light intensity, wherein the first light intensity is greater than the second light intensity, and the second light The ratio of the intensity to the first light intensity has an upper and lower limit. Specifically, since the auxiliary light-emitting element 56 of the present embodiment is used to reduce the probability of dark spot generation, the main light-emitting element of the backlight module 50a is still the optical component 100, and accordingly, the first light of the light emitted by the light-emitting element 120 The intensity is greater as the primary illuminating element, and the second light intensity of the light emitted by the auxiliary illuminating element 56 is less to provide light between the optical components 100, thereby reducing the generation of dark spots. Wherein, in this embodiment, the ratio of the second light intensity to the first light intensity is: Where P is the spacing (unit: millimeter (mm)) between each two adjacent light-emitting elements 120, and S is the size (unit: inch) of the backlight module 50a.

Figure 8 is a line graph of the pitch of the light-emitting elements of Figure 7 versus the ratio of the second light intensity to the first light intensity. Referring to FIG. 7 and FIG. 8 , for example, the 42 吋 backlight module 50 a is taken as an example. If the pitch P of the illuminating elements 120 is 80 mm, the second light intensity of each auxiliary illuminating element 56 may be a illuminating element. The first light intensity of 120 is 0.024 times to 0.026 times. In other words, if the first light intensity of each of the light-emitting elements 120 is 200 lumens, the second light intensity of the auxiliary light-emitting elements 56 is between 4.8 lumens and 5.2 lumens. In addition, taking the 55-inch backlight module 50a as an example, if the pitch P of the light-emitting elements 120 is 100 mm, the second light intensity of each of the auxiliary light-emitting elements 56 may be 0.022 times the first light intensity of the light-emitting elements 120. 0.024 times. In other words, if the first light intensity of each of the light-emitting elements 120 is 250 lumens, the second light intensity of the auxiliary light-emitting elements 56 is between 5.5 lumens and 6 lumens. Therefore, for the backlight module 50a of different sizes, the first light intensity of the light-emitting element 120 and the auxiliary light-emitting element The second light intensity of the member 56 can be selected according to needs in different ranges. In addition, since the auxiliary light-emitting element 56 can reduce the probability of dark spot generation, even if the pitch P between the optical components 100 is adjusted, for example, the pitch P between the optical components 100 is increased, the light-emitting element 120 and the auxiliary light-emitting element 56 can still be Adjust the brightness of the light within the corresponding range. Accordingly, even if the pitch P between the optical components 100 is increased in the backlight module 50a of the same size, and the number of the optical components 100 is reduced, thereby reducing the manufacturing cost of the backlight module 50a, the backlight module 50a can maintain uniformity. The light effect.

In summary, the optical lens used in the optical module of the present invention includes two intermediate portions and two light exiting portions on opposite sides of the intermediate portion, and the thickness of each of the light exit portions is greater than the thickness of the intermediate portion. In this manner, the light emitted by the light-emitting element enters the optical lens from the light-incident region corresponding to the intermediate portion, and part of the light is reflected by the reflecting surface of the two light-emitting portions, and then the optical lens is emitted from the light-emitting surface of the two light-emitting portions. Accordingly, the optical module of the present invention has a bidirectional light-emitting function. Furthermore, the backlight module of the present invention has a plurality of the above-described optical components disposed on the reflective module along the center line of the hollow frame. In this way, the light emitted by each of the light-emitting elements of the optical component can be emitted from the two light-emitting portions of the optical lens, and reflected by the reflective module and then emitted out of the hollow frame to form a surface light source. Accordingly, the above design can reduce the manufacturing cost of the backlight module of the present invention. In addition, since the optical component of the present invention can emit light in both directions, the light is emitted outside the hollow frame after the light is mixed in the hollow frame, and the backlight module of the present invention can also be configured with auxiliary light between adjacent optical components according to requirements. Components to reduce the chance of dark spots. Accordingly, the backlight module of the present invention has a uniform light-emitting effect.

Although the present invention has been disclosed above by way of example, it is not intended to limit the present invention. The scope of the present invention is defined by the scope of the appended claims, which are defined by the scope of the appended claims, without departing from the spirit and scope of the invention. quasi.

100‧‧‧Optical components

110‧‧‧ optical lens

112‧‧‧Intermediate

112a‧‧‧Center axis

112b‧‧‧Into the light zone

114‧‧‧Lighting Department

114a‧‧‧reflecting surface

114b‧‧‧Glossy

114c‧‧‧ bottom

116‧‧‧ Groove

116a, 116b‧‧‧ oblique sides

118‧‧‧Reflective unit

120‧‧‧Lighting elements

L11, L12, L13, L14‧‧‧ ray path

T1, T2‧‧‧ thickness

Claims (22)

An optical component comprising: an optical lens comprising an intermediate portion and two light exiting portions on opposite sides of the intermediate portion, and each of the light exiting portions has a thickness greater than a thickness of the intermediate portion, wherein the optical lens has a center a shaft and an incident light region, the central axis is located on a first reference plane and passes through the intermediate portion, and the light incident region corresponds to the central axis, and each of the light exiting portions has a reflecting surface, a light emitting surface and a a bottom surface, the light-emitting surface is connected to the oppositely disposed reflective surface and the bottom surface, the reflective surface and the bottom surface respectively adjoin the intermediate portion, and the bottom surface is adjacent to the light-incident region; and a light-emitting element is located on the central axis Facing the light entrance region, the light emitting element is adapted to emit a light toward the optical lens, wherein after the light enters the optical lens from the light entering region, part of the light is reflected on the corresponding reflective surface, and corresponding to The light exit surface is emitted. The optical component of claim 1, wherein the optical lens has a recess in the light entrance region, and the light enters the optical lens from the recess. The optical component of claim 2, wherein the central axis is further located on a second reference plane, the groove having at least two side edges on the second reference plane, each side of the side facing Corresponding to the light exiting portion. The optical component of claim 3, wherein the groove is symmetrical along the first reference plane, and the two sides of the groove are symmetric along the central axis on the second reference plane. The optical component of claim 1, wherein the two light exiting portions Symmetrical along the first reference plane, and the two light exiting portions are symmetric along the central axis on the second reference plane. The optical component of claim 1, wherein the two light exiting portions each extend outwardly from the intermediate portion along an axial direction, the axial direction being perpendicular to the central axis, and the axial direction passing through the two light exiting surfaces. The optical component of claim 1, wherein the bottom surface of each of the light exiting portions is provided with a reflecting unit, and after the light enters the optical lens from the light entering region, part of the light passes through the reflective surface at the corresponding bottom surface. The unit reflects and exits from the corresponding light exit surface. The optical component of claim 1, wherein each of the reflecting surfaces is a curved surface, each of the light emitting surfaces is a plane, and an edge between each of the light emitting surfaces and the corresponding reflecting surface is a smooth curve. . The optical component according to claim 1, wherein the thickness of each of the light-emitting portions gradually increases from an end of each of the light-emitting portions adjacent to the intermediate portion toward the other end of the light-emitting portion away from the intermediate portion. A backlight module includes: a hollow frame having an accommodating space; a reflective module disposed on the inner side of the hollow frame; and a plurality of optical components disposed on the reflective module and located in the accommodating space And the optical components are arranged along a center line of the hollow frame, each of the optical components comprising: an optical lens comprising an intermediate portion and opposite sides of the intermediate portion The two light exiting portions, and each of the light exiting portions has a thickness greater than a thickness of the intermediate portion, wherein the optical lens has a central axis and a light incident region, the central axis being located on a first reference plane and passing through the intermediate portion And the light-incident region corresponds to the central axis, and each of the light-emitting portions has a reflective surface, a light-emitting surface and a bottom surface, and the light-emitting surface is connected to the oppositely disposed reflective surface and the bottom surface, and the reflective surface and the bottom surface are respectively Adjacent to the intermediate portion, the bottom surface abuts the light entrance region; and a light emitting element located on the central axis and facing the light incident region, the light emitting element being adapted to emit a light toward the optical lens, wherein the light is from After the light entering region enters the optical lens, part of the light is reflected on the corresponding reflective surface, and is emitted from the corresponding light emitting surface, and the light rays emitted from the optical lenses are reflected by the reflective module. The hollow frame is shot out. The backlight module of claim 10, wherein each of the optical lenses has a groove located in the corresponding light entrance region, and each of the light rays enters the corresponding optical lens from the corresponding groove. The backlight module of claim 11, wherein each of the central axes is further located on a second reference plane, and each of the grooves has at least two sides on the corresponding second reference plane, each of which The side faces respectively face the corresponding light exiting portions. The backlight module of claim 12, wherein each of the grooves is symmetric along the corresponding first reference plane, and the two sides of each of the grooves are along the corresponding second reference plane The corresponding central axis appears symmetric. The backlight module of claim 10, wherein each of the opticals The two light exiting portions of the lens are symmetric along the corresponding first reference plane, and the two light exiting portions of each of the optical lenses are symmetric along the corresponding central axis on the corresponding second reference plane. The backlight module of claim 10, wherein the two light exiting portions of each of the optical lenses extend outward from the corresponding intermediate portion along an axial direction, the axial direction being perpendicular to the corresponding central axis, and The axial direction passes through the corresponding two light exiting faces. The backlight module of claim 10, wherein the bottom surface of each of the light exiting portions is provided with a reflecting unit, and each of the light rays enters the corresponding optical lens from the corresponding light entering region, and the corresponding portion of the light The corresponding bottom surface is reflected by the corresponding reflecting unit and emitted from the corresponding light emitting surface. The backlight module of claim 10, wherein each of the reflecting surfaces is a curved surface, each of the light emitting surfaces is a plane, and an edge between each of the light emitting surfaces and the corresponding reflecting surface is smoothed. curve. The backlight module of claim 10, wherein the thickness of each of the light-emitting portions is gradually increased from an end of each of the light-emitting portions adjacent to the corresponding intermediate portion toward the other end of the light-emitting portion away from the corresponding intermediate portion. . The backlight module of claim 10, further comprising: a plurality of auxiliary light-emitting elements disposed on the reflective module and located in the accommodating space, and each of the auxiliary illuminating elements along the center line Correspondingly arranged between every two adjacent optical components. The backlight module of claim 19, wherein the light-emitting elements each have a first light intensity, and the auxiliary light-emitting elements each have a second Light intensity, and the first light intensity is greater than the second light intensity. The backlight module of claim 10, wherein the reflective module comprises: a bottom reflective sheet disposed on a bottom wall of the hollow frame, and the optical components are disposed on the bottom reflective sheet; a plurality of side reflection sheets are disposed on the plurality of side walls of the hollow frame, wherein the side walls are erected on the periphery of the bottom wall and constitute the accommodating space, and the two light exit portions of the optical lenses are respectively surfaced The opposite of the side reflection sheets. The backlight module of claim 21, wherein the bottom reflective sheet comprises a first material region and two second material regions, the first material region being adjacent to the optical components, and each of the second material regions respectively Positioned between one of the side reflection sheets and the first material region, and the specular reflection ratio of the first material region is larger than a specular reflection ratio of the second material regions.