WO2023159802A1

WO2023159802A1 - Beam splitting plate and backlight module having beam splitting plate

Info

Publication number: WO2023159802A1
Application number: PCT/CN2022/097736
Authority: WO
Inventors: 王钰鑫; 林炳腾
Original assignee: 富盛光电（吴江）有限公司
Priority date: 2022-02-24
Filing date: 2022-06-08
Publication date: 2023-08-31
Also published as: CN114518671A

Abstract

The present application relates to the field of light guide devices, and relates in particular to a beam splitting plate and a backlight module having the beam splitting plate. The beam splitting plate comprises a bottom plate and a plurality of beam splitting blocks; the plurality of beam splitting blocks are arranged on the bottom plate; the outlines of the surfaces facing the bottom plate of the beam splitting blocks are bottom surface outlines, the beam splitting blocks irregular triangular pyramids, and the bottom surface outlines are non-regular triangles. The backlight module comprises beam splitting plates and a light board, the beam splitting plates are arranged on the side of the light board having a light source, the beam splitting plates are arranged within an illumination range of the light board, and there at least two beam splitting plates that are stackingly arranged. The present application can overcome the problem of a light diffusion effect improving as the distance between a diffuser plate and a light source increases, and the thickness of a backlight module is reduced.

Description

A beam splitter and a backlight module with the beam splitter

technical field

The present application relates to the field of light guide devices, in particular to a beam splitter and a backlight module with the beam splitter.

Background technique

The backlight module is one of the key components of the LCD panel. Its function is to supply sufficient brightness and evenly distributed light sources so that the LCD panel can display images normally.

Traditional LED direct-lit backlight modules are set according to the spacing of a single LED lamp bead, and the illumination range of the LED lamp bead is elliptical, which leads to dark areas between the LED lamp beads. The traditional method is to use many optical elements or optical films to disperse the light source, or to further increase the distance between the optical plate or film and the LED light, so that the light of the LED light can get a better light mixing space and achieve a uniform effect of the backlight picture . The most commonly used optical plate at this stage is the diffuser plate, which uses the ability of the diffuser plate to optically atomize the light of a single LED light and then homogenize all the point light sources, transforming the point light source into a surface light source.

However, there are obvious shortcomings in the use of the diffuser plate, that is, in the process of atomizing the light source, it is necessary to keep a certain distance from the light source, and the farther the distance is, the better the atomization effect is, resulting in a larger thickness of the LED backlight module .

Contents of the invention

In order to overcome the problem that the farther the distance between the diffuser plate and the light source is, the better the atomization effect is, and to reduce the thickness of the backlight module, the present application provides a beam splitter and a backlight module with the beam splitter.

On the one hand, the present application provides a spectroscopic plate, which adopts the following technical solution:

A spectroscopic plate, comprising a base plate and a plurality of spectroscopic blocks, a plurality of spectroscopic blocks are all arranged on the base plate, and the spectroscopic blocks are in the shape of a triangular pyramid.

By adopting the above technical solution, when the light passes through the beam splitter, it is refracted and deflected to a larger angle, thereby expanding the irradiation range of the light and reducing and eliminating the dark area between the lamp beads.

In a specific embodiment, the profile of the side of the light splitting block facing the bottom plate is a bottom profile, and the bottom profile is a non-regular triangle.

By adopting the above technical solution, the shape of the beam splitting block is changed, and the light emitted from the beam splitting block is guided, so that the light can be guided conveniently so that the light rays can be gathered together, and the brightness of the beam splitting plate can be improved.

In a specific embodiment, the bottom contour is an isosceles triangle, the direction parallel to the bottom of the bottom contour is the Y direction, and the direction parallel to the midline on the bottom contour is the X direction.

By adopting the above technical solution, the shape of the surface connected to the waist of the light splitting block and the bottom contour is the same, which is convenient for guiding the light passing through the light splitting block and for eliminating dark areas by guiding the light.

In a specific implementation, the contour of the bottom surface is an obtuse-angled isosceles triangle or a right-angled isosceles triangle; the light-splitting blocks are arranged staggered along the X direction, and the adjacent light-splitting blocks arranged along the Y direction blocks, the top corners of the bottom contours of which face oppositely.

By adopting the above technical solution, the obtuse-angled isosceles right-angled triangle and the right-angled isosceles right-angled triangle have a larger active area, which enhances the effect of diffusing light.

In a specific implementation, the contour of the bottom surface is an acute-angled isosceles triangle; for the adjacent beam-splitting blocks arranged along the X direction, the apex angles of the contours of the bottom surface face opposite directions, and the beam-splitting blocks along the The Y directions are arranged staggeredly.

By adopting the above technical solution, it is convenient for the light splitting blocks to be closely arranged on the bottom plate, so that more light splitting blocks can be accommodated on the bottom plate, and the light diffusion effect is improved.

In a specific implementation, the contour of the bottom surface is an acute-angled isosceles triangle; the light splitting blocks are arranged staggered along the X direction and linearly arranged along the Y direction.

In a specific embodiment, the bottom contour is a non-isosceles right triangle, the direction parallel to the longer right-angled side of the bottom contour is M direction, and the direction parallel to the other right-angled side of the bottom contour is N direction: multiple light splitting blocks are arranged staggered along the M direction, and arranged staggered along the N direction.

By adopting the above-mentioned technical scheme, the contours of the bottom surfaces of the adjacent beam splitters are spliced to form a rectangle, which facilitates the beam splitters to cover the surface of the bottom plate, reduces the occurrence of some beam splitters on the surface of the bottom plate, and improves the light diffusion effect of the beam splitter.

In a specific implementation, the thickness of the bottom plate is L, the distance between the tip of the spectroscopic block and the bottom plate is l, and 0.2mm≤l≤2L/3.

By adopting the above technical solution, the size of the beam splitting block is controlled, so that the size of the beam splitting block can be adjusted without affecting the rigidity of the beam splitting plate, and the production cost can be saved.

On the other hand, the present application also provides a backlight module, which adopts the following technical solution:

A backlight module, including the above-mentioned beam splitter, and also includes a lamp board, the beam splitter is arranged on the side of the lamp board with a light source, the beam splitter is arranged in the irradiation range of the lamp board, the At least two light splitting plates are stacked.

By adopting the above technical solution, multiple beam splitters diffuse the light emitted by the lamp panel, so that the point light source on the lamp panel is atomized into a surface light source, replacing the original diffusion plate, and reducing the thickness of the backlight module.

In a specific implementation, the angle c between the orientations of the beamsplitters on adjacent beamsplitters satisfies 0°<c<180°.

By adopting the above-mentioned technical solution, by adjusting the orientation of the beam splitting block, the diffused light is guided, the light is diffused in different directions, the dark area is reduced and eliminated, the atomization effect of the light source light is improved, and the diffuser plate is completely replaced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Use multiple beam splitters instead of diffusion plates to diffuse the point light sources on the lamp board into surface light sources and reduce the thickness of the backlight module;

2. The light splitters on the surface of the bottom plate are set into triangular pyramids of different shapes, which is convenient for atomizing the light source of the light panel according to different usage conditions and improving the atomization effect of the light source.

Description of drawings

Fig. 1 is a schematic diagram showing the structure of the lamp panel and the illumination range of the lamp bead.

Fig. 2 is a schematic diagram showing that the illumination range of the lamp bead has been diffused.

FIG. 3 is a schematic diagram embodying the structure of the beam splitter in Example 1. FIG.

FIG. 4 is a schematic diagram showing the size relationship between the beam splitter block and the bottom plate.

FIG. 5 is a schematic diagram embodying the structure of the beam splitter in Embodiment 2.

FIG. 6 is a schematic diagram embodying the structure of the beam splitter in Embodiment 3. FIG.

FIG. 7 is a schematic diagram embodying the structure of the beam splitter in Embodiment 4. FIG.

FIG. 8 is a schematic diagram showing the structure of the backlight module.

FIG. 9 is a schematic diagram showing the included angle of the direction of the beam splitter blocks on adjacent beam splitter plates.

Explanation of reference numerals: 1. Base plate; 2. Beam splitting block; 3. Bottom surface outline; 4. Light board; 41. Mounting plate; 42. Lamp bead; 10. Beam splitter.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-9.

Referring to Figures 1 and 2, a lamp panel 4 includes a mounting plate 41 and a plurality of lamp beads 42, the plurality of lamp beads 42 are arranged in a rectangular array on the mounting plate 41, and the irradiation range of the lamp beads 42 is on the mounting plate 41 The projection of is elliptical with a major and minor axis. The gaps between the illuminated ranges are the dark areas.

Example 1:

Referring to FIG. 3 , the beam splitter 10 includes a base plate 1 and multiple beam splitter blocks 2 , the multiple beam splitter blocks 2 are integrally formed on the base plate 1 , and the beam splitter blocks 2 are in the shape of triangular pyramids.

When in use, the side of the base plate 1 provided with the spectroscopic block 2 faces away from the lamp panel 4, and the light emitted by the lamp beads 42 on the mounting plate 41 enters the spectroscopic block 2 through the base plate 1 and radiates outward from the spectroscopic block 2. The beam splitting block 2 can deflect the absorbed light when passing through the beam splitting block 2 through its inclined side wall, so as to realize the diffusion of light and improve the irradiation range of the light.

Referring to Fig. 3, the profile of the side of the light splitting block 2 facing the bottom plate 1 is the bottom profile 3, the bottom profile 3 is an acute-angled isosceles triangle, the Y direction is parallel to the bottom of the bottom profile 3, and the center line on the bottom of the bottom profile 3 What is parallel is the X direction. In this embodiment, the X direction is parallel to the width direction of the base plate 1 , and the Y direction is parallel to the length direction of the base plate 1 . Adjacent spectroscopic blocks 2 arranged along the X direction have opposite apex angles of their bottom contours 3 , and the spectroscopic blocks 2 are arranged staggeredly in the Y direction, and the waists of the bottom contours 3 of adjacent spectroscopic blocks 2 overlap. This arrangement enables the light splitting blocks 2 to be arranged as closely as possible on the bottom plate 1, and as many light splitting blocks 2 as possible are arranged on the bottom plate 1, so as to improve the collection effect of the light splitting plate 10 and the light diffusion effect.

Referring to Fig. 4, the thickness of the bottom plate 1 is L, the distance between the tip of the spectroscopic block 2 not connected to the bottom plate 1 is l, and 0.2mm≤l≤2L/3. For example, the thickness of the bottom plate 1 is 1 mm, and the distance from the tip of the spectroscopic block 2 to the side of the spectroscopic block 2 facing the bottom plate 1 is between 0.2 mm and 0.66 mm. Since the spectroscopic plate 10 is molded by injection molding, by limiting the size of the spectroscopic block 2, the use of materials can be reduced without affecting the rigidity of the spectroscopic plate 10, and the production cost can be saved.

Example 2:

Referring to FIG. 5 , the difference between Embodiment 2 and Embodiment 1 is that the spectroscopic blocks 2 are arranged in a staggered manner along the X direction and arranged linearly along the Y direction. The arrangement of the beam splitter 2 determines the divergence direction of the light after passing through the beam splitter 2. By changing the arrangement of the beam splitter 2 on the base plate 1, the divergence direction of the light can be adjusted to facilitate adaptation to different lamp panels. 4.

Example 3:

Referring to FIG. 6 , the difference between Embodiment 3 and Embodiment 1 is that: the bottom profile 3 of the spectroscopic block 2 is an obtuse-angled isosceles triangle or an isosceles right-angled triangle. In the following, an isosceles obtuse triangle will be used for illustration.

Referring to Fig. 6, the light splitting blocks 2 are arranged in a staggered manner along the X direction, and the waists of the bottom surface contours 3 of adjacent light splitting blocks 2 overlap, the light splitting blocks 2 are arranged linearly along the Y direction, and the bottom surface contours 3 of adjacent light splitting blocks 2 The apex angles are opposite, and the bottom lines of the bottom contours 3 of two adjacent spectroscopic blocks 2 coincide, so that the adjacent bottom contours 3 are spliced into a rhombus.

Under the same specification, the beam splitter 2 whose bottom profile 3 is an obtuse-angled isosceles triangle can be regarded as a combination of two acute-angled isosceles triangle beam-splitters 2 whose bottom profile 3 is an obtuse-angled isosceles triangle. With a larger active area, it can diverge light more efficiently and have a better divergence effect. The effect of eliminating dark areas between the lamp beads 42 is better.

Example 4:

Referring to Fig. 7, the difference between Embodiment 4 and Embodiment 1 is that: the bottom surface profile 3 of the beam splitting block 2 is a non-isosceles right triangle, and the direction parallel to the longer right-angled side of the bottom surface profile 3 is the M direction, and the bottom surface profile 3 is parallel to the bottom surface profile 3. The other right-angled side is parallel to the N direction. The spectroscopic blocks 2 are arranged staggered along the M direction and along the N direction. The bottom contours 3 of the adjacent spectroscopic blocks 2 are spliced into a rectangle, and the long sides or short sides of the adjacent rectangles overlap.

Since the beam splitters 2 are spliced together, the bottom surface outline 3 is rectangular as a whole, it is more convenient to spread the beam splitters 2 over the entire base plate 1, reduce the situation that only part of the beam splitters 2 appear on the edge of the base plate 1, and expand the action area of the beam splitter 10. Diffusion of light.

Referring to FIG. 8 and FIG. 9 , the embodiment of the present application also discloses a backlight module, including a lamp panel 4 and any one of the above-mentioned beam splitters 10 , the beam splitter 10 is arranged above the lamp panel 4 , and the beam splitter 10 is placed on the lamp panel. 4, the side of the beam splitter 10 with the beam splitter block 2 faces away from the lamp board 4. Two beam splitters 10 are provided, and the two beam splitters 10 are stacked up and down. The angle between the spectroscopic blocks 2 on the two bottom plates 1 is c, where 0°<c<180°, and in this embodiment, c=90°. By changing the orientation of the light splitter block 2 on the light splitter plate 10 , the light is diffused in different directions, and the dark area between the lamp beads 42 is eliminated.

Since the distance between the beam splitter 10 and the lamp bead 42 has little influence on the light diffusion effect of the beam splitter 10, by replacing the diffusion plate with two beam splitters 10, the distance between the beam splitter 10 and the lamp panel 4 can be as close as possible. The spacing is reduced, thereby reducing the overall thickness of the backlight module.

The implementation principle of the embodiment of the present application is: use the light splitter 10 that requires a smaller distance from the light source to replace the diffusion plate, and at least two light splitters 10 to diffuse the light emitted by the lamp board 4, and the light on the lamp board 4 The point light source is atomized into a surface light source, which effectively reduces the thickness of the backlight module.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims

A spectroscopic plate, characterized in that it comprises a bottom plate (1) and multiple spectroscopic blocks (2), the multiple spectroscopic blocks (2) are all arranged on the bottom plate (1), and the spectroscopic blocks (2) In the shape of a triangular pyramid.
The spectroscopic plate according to claim 1, characterized in that: the contour of the side of the spectroscopic block (2) facing the bottom plate (1) is a bottom contour (3), and the bottom contour (3) is a non-equal triangle .
The beam splitter according to claim 1, characterized in that: the bottom contour (3) is an isosceles triangle, the direction parallel to the bottom of the bottom contour (3) is the Y direction, and the direction parallel to the bottom contour (3) ) parallel to the midline on the bottom edge is the X direction.
The spectroscopic plate according to claim 3, characterized in that: the bottom surface profile (3) is an obtuse-angled isosceles triangle or a right-angled isosceles triangle; the spectroscopic blocks (2) are arranged staggered along the X direction, along the The apex angles of the bottom contours (3) of the adjacent spectroscopic blocks (2) arranged in the Y direction are opposite.
The beam splitter according to claim 3, characterized in that: the bottom profile (3) is an acute-angled isosceles triangle; the adjacent beam splitter blocks (2) arranged along the X direction have the bottom profile (3) have opposite apex angles, and the spectroscopic blocks (2) are arranged in a staggered manner along the Y direction.
The spectroscopic plate according to claim 3, characterized in that: the bottom profile (3) is an acute-angled isosceles triangle; the spectroscopic blocks (2) are arranged staggered along the X direction and linearly arranged along the Y direction.
The beam splitter according to claim 1, characterized in that: the bottom profile (3) is a non-isosceles right triangle, and the direction parallel to the longer right-angled side of the bottom profile (3) is the M direction, which is parallel to the bottom profile (3). The other right-angled side of the bottom profile (3) is parallel to the N direction; a plurality of the light splitting blocks (2) are arranged staggered along the M direction, and arranged staggered along the N direction.
The spectroscopic plate according to claim 1, characterized in that: the thickness of the base plate (1) is L, the distance between the tip of the spectroscopic block (2) and the base plate (1) is l, 0.2mm≤l≤2L /3.
A backlight module, characterized in that it includes a beam splitter according to any one of claims 1 to 8, and also includes a lamp panel (4), and the beam splitter is arranged on the side of the lamp panel (4) with a light source. On one side, the beam splitter is arranged within the irradiation range of the lamp panel (4), and at least two of the beam splitters are stacked.
The backlight module according to claim 9, characterized in that: the included angle c between the orientations of the light splitter blocks (2) on adjacent said light splitter plates satisfies 0°<c<180°.