CN114755752A - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN114755752A CN114755752A CN202210391429.2A CN202210391429A CN114755752A CN 114755752 A CN114755752 A CN 114755752A CN 202210391429 A CN202210391429 A CN 202210391429A CN 114755752 A CN114755752 A CN 114755752A
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- light emitting
- emitting surface
- light source
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- 230000003287 optical effect Effects 0.000 claims description 26
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 240000003380 Passiflora rubra Species 0.000 description 2
- 210000000007 bat wing Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Abstract
The invention provides a backlight module, which comprises a wedge-shaped light guide plate and a light source component, wherein the wedge-shaped light guide plate comprises a light incident surface, a first light emitting surface and a second light emitting surface which are oppositely arranged and respectively connected with the light incident surface, and a third light emitting surface which is oppositely arranged with the light incident surface and is connected with the first light emitting surface and the second light emitting surface; the first light-emitting surface and the second light-emitting surface are arranged in a relatively inclined mode. The light source assembly is arranged on one side of the light incoming surface of the wedge-shaped light guide plate and comprises a light source chip and a light ray adjusting layer, and at least one part of the light ray adjusting layer is located on one side, facing the light incoming surface, of the light source chip. According to the embodiment of the invention, the light ray adjusting layer is arranged on the light source chip and can adjust and control the light ray path, so that the light emitting quantity of the light source component to the first light emitting surface and the second light emitting surface is increased, the light emitting quantity of the light source component to the third light emitting surface is reduced, and the problem of low light utilization rate of the backlight module caused by serious light leakage of the wedge-shaped light guide plate can be solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module.
Background
In recent years, with the development of display technologies, the requirements of some display devices on viewing angle and brightness are higher and higher, such as VR display devices, peep-proof display devices, on-screen fingerprint display devices, and the like, the screen of the display device is required to have higher brightness at a small angle viewing angle. The collimating backlight can collimate the large-angle light to the front-view angle, and simultaneously improve the brightness of the front-view angle and reduce the brightness of the large-view angle. At present, a conventional collimating backlight scheme is to use a wedge-shaped light guide plate, as shown in fig. 1, the backlight module is composed of a light source 1, a wedge-shaped light guide plate 2, an inverse prism sheet 3, and a reflector sheet 4, where the wedge-shaped light guide plate 2 includes a light incident surface a, a first light emergent surface b, a second light emergent surface c, and a third light emergent surface d, where a part of light of the light source 1 on one side of the light incident surface a may be emitted perpendicularly from the third light emergent surface d, so that the wedge-shaped light guide plate generates light leakage, which results in serious light loss, where the light loss amount is related to the height ratio of the third light emergent surface d to the light incident surface a, and generally may reach 30% -50%, thereby resulting in a low light utilization rate of the backlight module.
Therefore, a technical solution is needed to solve the above problems.
Disclosure of Invention
The invention provides a backlight module which can solve the technical problem that the light utilization rate of the backlight module is low due to light leakage of a wedge-shaped light guide plate in the conventional backlight module.
In order to solve the problems, the technical scheme provided by the invention is as follows:
an embodiment of the present invention provides a backlight module, including:
the wedge-shaped light guide plate comprises a light incident surface, a first light emitting surface and a second light emitting surface which are oppositely arranged and respectively connected with the light incident surface, and a third light emitting surface which is oppositely arranged with the light incident surface and is connected with the first light emitting surface and the second light emitting surface; the first light-emitting surface and the second light-emitting surface are arranged in a relatively inclined manner;
the light source assembly is arranged on one side of the light inlet surface of the wedge-shaped light guide plate and comprises a light source chip and a light ray adjusting layer, and at least one part of the light ray adjusting layer is positioned on one side, facing the light inlet surface, of the light source chip;
at least one part of the light emitted by the light source chip and emitted to the third light emitting surface changes the path of the light through the light adjusting layer and emits to at least one of the first light emitting surface and the second light emitting surface.
Optionally, in some embodiments of the present invention, the light source assembly is disposed parallel to the light incident surface, the light beam emitted by the light source assembly includes a first light emitting area and a second light emitting area located on at least one side of the first light emitting area, an included angle between a vertical plane and a light ray emitted from the second light emitting area to the light incident surface is greater than an included angle between a vertical plane and a light ray emitted from the first light emitting area to the light incident surface, where the vertical plane is a plane perpendicular to the light incident surface and parallel to the second light emitting surface;
the light of the second light emergent area irradiates to at least one of the first light emergent surface and the second light emergent surface from the light incident surface, and the light emergent quantity of the second light emergent area is larger than that of the first light emergent area.
Optionally, in some embodiments of the present invention, an angle between the light ray emitted from the first light emitting region to the light incident surface and the vertical plane is in a range of 0 ° to 30 °, and an angle between the light ray emitted from the second light emitting region to the light incident surface and the vertical plane is in a range of 30 ° to 60 °.
Optionally, in some embodiments of the invention, the light source chip includes a front surface facing the light incident surface and a side surface located around the front surface and connected to the front surface, where the light ray adjusting layer at least covers the front surface.
Optionally, in some embodiments of the present invention, the light ray adjusting layer is an optical lens, the optical lens covers are disposed on the front surface and the side surface, and a surface of the optical lens on a side opposite to the light source chip is at least one arc surface; at least one part of light emitted by the light source chip from the first light emitting area to the third light emitting area changes the path of the light through the optical lens and deflects to the second light emitting area.
Optionally, in some embodiments of the invention, a surface of the optical lens, which faces away from the light source chip, is an arc surface, a curvature of a side of the arc surface, which is close to the first light emitting surface, is greater than a curvature of a side of the arc surface, which is close to the second light emitting surface, and the second light emitting area is located on a side of the first light emitting area, which is close to the first light emitting surface; alternatively, the first and second liquid crystal display panels may be,
the curvature of the cambered surface on the side close to the first light-emitting surface is smaller than that of the cambered surface on the side close to the second light-emitting surface, and the second light-emitting area is located on the side, close to the second light-emitting surface, of the first light-emitting area.
Optionally, in some embodiments of the present invention, a surface of the optical lens on a side opposite to the light source chip is two intersecting arc surfaces, an intersecting line exists at an intersecting position of the two arc surfaces, and a groove is formed at the intersecting line on the surface of the optical lens on the side opposite to the light source chip;
The two cambered surfaces are arranged in an axisymmetric manner by taking the intersection line as an axis, and the second light emitting areas are arranged on two sides of the first light emitting area in an axisymmetric manner by taking the intersection line as an axis.
Optionally, in some embodiments of the invention, the light ray adjusting layer is a reflective layer, the reflective layer includes a first reflective layer and a second reflective layer, the first reflective layer is disposed on the front surface of the light source chip, and the second reflective layer is disposed on a side of the light source chip opposite to the light incident surface, where at least a part of light rays emitted by the light source chip and directed from the first light emitting area to the third light emitting area are changed in light ray path by the reflective layer and deflected toward the second light emitting area.
Optionally, in some embodiments of the invention, the light adjusting layer is a polarizing layer, and the polarizing layer is disposed on the front surface of the light source chip, wherein at least a part of the light emitted by the light source chip from the first light emitting area to the third light emitting area changes a light path through the polarizing layer and is deflected to the second light emitting area.
Optionally, in some embodiments of the invention, a distance between one end of the first light emitting surface far from the light incident surface and one end of the second light emitting surface far from the light incident surface is smaller than a distance between one end of the first light emitting surface close to the light incident surface and one end of the second light emitting surface close to the light incident surface.
Optionally, in some embodiments of the invention, a light exit microstructure is disposed on a surface of at least one of the first light exit surface and the second light exit surface, and a distribution density of the light exit microstructures is sequentially increased from the light entrance surface to the third light exit surface.
Optionally, in some embodiments of the invention, the wedge-shaped light guide plate further includes two opposite side surfaces, the light incident surface is provided with a light incident micro-prism structure, and the light incident micro-prism structure extends from one side surface of the wedge-shaped light guide plate to the other side surface or extends from the first light exit surface to the second light exit surface.
Optionally, in some embodiments of the present invention, the backlight module further includes a reverse prism film disposed on one side of the first light emitting surface and a reflective film disposed on one side of the second light emitting surface, where one surface of the reverse prism film, on which the micro-prism structure is disposed, faces the first light emitting surface.
The invention has the beneficial effects that: according to the backlight module provided by the invention, the light ray adjusting layer is arranged on the light source chip and can adjust and control the path of the light ray, at least one part of the light ray emitted by the light source chip and emitted to the third light-emitting surface can be deflected to the first light-emitting surface and the second light-emitting surface through the light ray adjusting layer, the light emitting quantity of the first light-emitting surface and the second light-emitting surface is increased, and the light emitting quantity of the third light-emitting surface is reduced, so that the problem of serious light leakage of the wedge-shaped light guide plate can be solved, and the light utilization rate of the backlight module is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a backlight module according to the prior art;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a reverse prism film according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a wedge-shaped light guide plate according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of the first light emitting surface or the second light emitting surface of the wedge-shaped light guide plate according to the first embodiment of the invention;
FIG. 6 is a top view of an individual light source module provided in accordance with one embodiment of the present invention;
FIG. 7 is a cross-sectional view of a light source module of the backlight module shown in FIG. 2;
FIG. 8 is a cross-sectional view of a light source module in a backlight module according to a second embodiment of the present invention;
fig. 9 is a cross-sectional view of a light source module in a backlight module according to a third embodiment of the invention;
Fig. 10 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present invention;
fig. 11 is a cross-sectional view of a light source module according to a fourth embodiment of the invention;
fig. 12 is a cross-sectional view of a light source module in a backlight module according to a fifth embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
Referring to fig. 2 to 12, an embodiment of the present invention provides a backlight module, which is a side-in type backlight module, and the backlight module can be used with a liquid crystal display panel, but not limited thereto. The backlight module includes a wedge-shaped light guide plate 100 and a light source assembly 200, wherein the wedge-shaped light guide plate 100 is surrounded by a light incident surface 100a, a first light emitting surface 100b, a second light emitting surface 100c, a third light emitting surface 100d and two side surfaces 100 e. The first light emitting surface 100b and the second light emitting surface 100c are oppositely arranged and are respectively connected with two ends of the light incident surface 100a, the third light emitting surface 100d is oppositely arranged with the light incident surface 100a and is connected with the first light emitting surface 100b and the second light emitting surface 100c, wherein the light incident surface 100a and the third light emitting surface 100d are arranged in parallel, and the first light emitting surface 100b and the second light emitting surface 100c are oppositely inclined.
The light source assembly 200 is disposed on one side of the light incident surface 100a of the wedge-shaped light guide plate 100, the light source assembly 200 includes a light source chip 201 and a light ray adjusting layer 202, and at least a portion of the light ray adjusting layer 202 is located on one side of the light source chip 201 facing the light incident surface 100 a.
At least a part of the light emitted by the light source chip 201 and directed to the third light emitting surface 100d changes the path of the light through the light adjusting layer 202 and is directed to at least one of the first light emitting surface 100b and the second light emitting surface 100 c.
In the backlight module according to the embodiment of the invention, by designing the structure of the light source assembly 200, the light ray adjusting layer 202 is arranged on the light source chip 201, and the light ray adjusting layer 202 is used for adjusting the path of the light rays emitted into the light ray adjusting layer 202, so that at least a part of the light rays emitted by the light source chip 201 and emitted to the third light emitting surface 100d can be deflected to be emitted to the first light emitting surface 100b and the second light emitting surface 100c, thereby increasing the light emitting amount of the first light emitting surface 100b and the second light emitting surface 100c, and reducing the light emitting amount of the third light emitting surface 100d, so that the problem of serious light leakage of the wedge-shaped light guide plate can be solved, and the light utilization rate of the backlight module can be improved.
Please refer to the following embodiments. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention. The backlight assembly includes a wedge-shaped light guide plate 100, a light source assembly 200, an inverse prism film 300, and a reflection film 400. The wedge-shaped light guide plate 100 is surrounded by a light incident surface 100a, a first light emitting surface 100b, a second light emitting surface 100c, a third light emitting surface 100d, and two side surfaces 100 e. The light source assembly 200 is disposed on one side of the light incident surface 100a of the wedge-shaped light guide plate 100, the inverse prism film 300 is disposed on one side of the first light emitting surface 100b, and the reflective film 400 is disposed on one side of the second light emitting surface 100 c.
The light source assembly 200 is disposed parallel to the light incident surface 100a, and light emitted from the light source assembly 200 enters the wedge-shaped light guide plate 100 through the light incident surface 100 a. The light source assembly 200 may be a bar-shaped light source assembly, which may extend from one side surface 100e to the other side surface 100e of the wedge-shaped light guide plate 100. It should be understood that only one light source module 200 is illustrated in the drawings, and a plurality of light source modules 200 may be disposed on one side of the light incident surface 100a according to actual requirements, which is not limited herein.
The reflective film 400 is disposed parallel to the second light emitting surface 100c, the reflective film 400 is configured to reflect the light emitted from the second light emitting surface 100c and emitted to the reflective film 400, and the light reflected by the reflective film 400 is emitted into the wedge-shaped light guide plate 100 from the second light emitting surface 100c again and emitted to the first light emitting surface 100 b. In order to increase the utilization rate of the light emitted from the light source assembly 200, the area of the reflective film 400 is the same as the area of the second light emitting surface 100c, and the reflective film 400 is disposed opposite to the second light emitting surface 100c, so that the light emitted from the second light emitting surface 100c is reflected to the first light emitting surface 100b as much as possible.
Referring to fig. 2 and 3, fig. 3 is a cross-sectional view of a reverse prism film according to an embodiment of the present invention. The reverse prism film 300 has a plurality of micro-prism structures 301 on a surface of one side thereof, one side of the reverse prism film 300 having the micro-prism structures 301 faces the first light emitting surface 100b, and the reverse prism film 300 is used for adjusting the degree of collimation of the light emitted from the first light emitting surface 100b and emitted to the reverse prism film 300.
In this embodiment, the plurality of micro-prism structures 301 are arranged in parallel and extend from one side surface 100e to the other side surface 100e of the wedge-shaped light guide plate 100, and the cross-sectional shape of the micro-prism structures 301 in the arrangement direction of the plurality of micro-prism structures 301 is a triangular structure, but not limited thereto. The angle formed by one end of the microprism structure 301 close to the first light-emitting surface 100b is a vertex angle, the vertex angle of the microprism structure 301 close to one side of the light source assembly 200 is smaller than the vertex angle of the microprism structure 301 far away from one side of the light source assembly 200, as shown in fig. 3, the angle is changed in a gradient manner, so as to adjust the collimation of the light emitted from the inverse prism film 300.
Referring to fig. 2, 4 and 5, fig. 4 is a schematic perspective view of a wedge-shaped light guide plate according to an embodiment of the present invention, and fig. 5 is a schematic structural view of a first light emitting surface or a second light emitting surface of the wedge-shaped light guide plate according to an embodiment of the present invention. As shown in fig. 4, the wedge-shaped light guide plate 100 is surrounded by a light incident surface 100a, a first light emitting surface 100b, a second light emitting surface 100c, a third light emitting surface 100d, and two side surfaces 100 e. The light incident surface 100a is perpendicular to the second light emitting surface 100c, the light incident surface 100a is parallel to the third light emitting surface 100d, a plane where the first light emitting surface 100b is located and a plane where the second light emitting surface 100c is located form a wedge angle, and a plurality of light emitting microstructures 1001 are arranged on a surface of at least one of the first light emitting surface 100b and the second light emitting surface 100 c. Referring to (a) and (b) in fig. 5, the distribution density of the light emitting microstructures 1001 increases from the light incident surface 100a to the third light emitting surface 100 d. Here, taking the example that the light-emitting microstructures 1001 are disposed on the second light-emitting surface 100c as an example, the light-emitting microstructures 1001 may destroy total reflection of light in the wedge-shaped light guide plate 100, when the light enters the light-emitting microstructures 1001 distributed on the second light-emitting surface 100c, the reflected light may be scattered in various directions, so that total reflection conditions in the wedge-shaped light guide plate 100 are destroyed, and the light is emitted from the first light-emitting surface 100b of the wedge-shaped light guide plate 100, thereby improving light-emitting uniformity of the wedge-shaped light guide plate 100.
The light-emitting microstructure 1001 may be a protrusion or a recess, and the cross-sectional shape of the light-emitting microstructure 1001 is one or a combination of more than one of a triangle, a semicircle, a square, a trapezoid, an ellipse and a hexagon in a direction perpendicular to the first light-emitting surface 100b or the second light-emitting surface 100 c.
With reference to fig. 2, at least two light entrance micro-prism structures 1002 arranged in parallel are disposed on the light entrance surface 100a, and each light entrance micro-prism structure 1002 extends from one side surface 100e of the wedge-shaped light guide plate 100 to the other side surface 100e or extends from the first light exit surface 100b to the second light exit surface 100 c. The light entrance micro-prism structure 1002 is mainly used for adjusting the distribution of light guided into the wedge-shaped light guide plate 100, and after the light emitted from the light source assembly 200 passes through the light entrance micro-prism structure 1002, the propagation direction of the light is refracted from the original propagation direction to be deviated to the first light emitting surface 100b and the second light emitting surface 100 c.
The light entrance micro-prism structure 1002 may be convex or concave, and in a direction in which the light entrance surface 100a points to the third light exit surface 100d, the cross-sectional shape of the light entrance micro-prism structure 1002 is one or a combination of more than one of a triangle, a semicircle, a square, a trapezoid, an ellipse, and a hexagon.
In this embodiment, a distance between an end of the first light emitting surface 100b far from the light incident surface 100a and an end of the second light emitting surface 100c far from the light incident surface 100a is smaller than a distance between an end of the first light emitting surface 100b close to the light incident surface 100a and an end of the second light emitting surface 100c close to the light incident surface 100 a.
Referring to fig. 2, 6 and 7, fig. 6 is a top view of a single light source module according to an embodiment of the present invention, and fig. 7 is a cross-sectional view of the light source module of the backlight module in fig. 2.
Referring to fig. 6 and 7, in the present embodiment, the light adjusting layer 202 is an optical lens, and the optical lens may be a primary optical lens or a secondary optical lens, the primary optical lens is directly packaged or bonded on the bottom plate 203, and the secondary optical lens is packaged or bonded on the primary optical lens. Specifically, the light adjusting layer 202 is a double-headed lens 2021, i.e., two hemispherical lenses or two free-form lenses.
The surface of the double-headed lens 2021 on the side away from the light source chip 201 is two intersecting arc surfaces, an intersecting line M exists at the intersecting position between the first arc surface 202a and the second arc surface 202b, and a groove is formed on the surface of the double-headed lens 2021 on the side away from the light source chip 201 on the intersecting line M. And, the first arc surface 202a and the second arc surface 202b are disposed axisymmetrically with respect to the intersection line M.
As shown in fig. 7, in the present embodiment, the light source assembly 200 includes a base plate 203, a light source chip 201, a light adjustment layer 202, and a phosphor layer 204. The light source chip 201 includes a front surface 201a facing the light incident surface 100a and a side surface 201b located around the front surface 201a and connected to the front surface 201 a. The light source chip 201 is disposed on the bottom plate 203, the phosphor layer 204 is disposed on the front surface 201a and the side surface 201b of the light source chip 201, and the light ray adjusting layer 202 is covered on the phosphor layer 204, that is, the light ray adjusting layer 202 completely covers the phosphor layer 204 and the light source chip 201. The phosphor layer 204 may be used to increase the light emitting intensity of the light source chip 201, and it is understood that in other embodiments, the phosphor layer 204 may not be disposed, or phosphor particles may be doped into the light ray adjustment layer 202, and at this time, the light ray adjustment layer 202 may be directly covered on the front surface 201a and the side surface 201b of the light source chip 201.
The light emitted by the light source chip 201 is diverged by the exit angle through the double-head lens 2021 to form a bat-wing beam, the bat-wing beam includes a first light exit area W1 and a second light exit area W2, the first light exit area W1 is disposed in an axisymmetric manner with the intersection line M, and the second light exit area W2 is disposed on two sides of the first light exit area W1 in an axisymmetric manner with the intersection line M. A plane perpendicular to the light incident surface 100a and parallel to the second light emitting surface 100c is defined as a vertical plane P, and an included angle α 2 between a light ray emitted from the second light emitting area W2 to the light incident surface 100a and the vertical plane P is greater than an included angle α 1 between a light ray emitted from the first light emitting area W1 to the light incident surface 100a and the vertical plane P. It is understood that the included angle α 2 is an angle between any light ray emitted from the second light emitting area W2 to the light incident surface 100a and the vertical plane P, and the included angle α 1 is an angle between any light ray emitted from the first light emitting area W1 to the light incident surface 100a and the vertical plane P.
Further, an included angle α 1 between the light ray emitted from the first light emitting area W1 to the light incident surface 100a and the vertical plane P ranges from 0 ° to 30 °, and an included angle α 2 between the light ray emitted from the second light emitting area W2 to the light incident surface 100a and the vertical plane P ranges from 30 ° to 60 °.
Among the light rays emitted by the light source chip 201 and emitted to the first light emitting area W1, there are light rays perpendicular to or close to the light incident surface 100a, and these light rays cannot irradiate the first light emitting surface 100b and the second light emitting surface 100c and are easily emitted from the third light emitting surface 100d, which causes a serious problem of light leakage. In this embodiment, at least a part of the light emitted from the light source chip 201 and emitted from the first light emitting area W1 to the third light emitting area 100d is changed in path by the double-headed lens 2021 and deflected toward the second light emitting area W2. It can be understood that the angle of deflection of the light emitted by the light source chip 201 after passing through the double-headed lens 2021 is related to the optical axis direction of the double-headed lens 2021, that is, by properly adjusting the optical axis direction of the double-headed lens 2021, after the light emitted by the light source chip 201 passes through the double-headed lens 2021, the light emitted to the first light emitting area W1 is reduced, and the light emitted to the second light emitting area W2 is increased. Therefore, the light exiting amount of the second light exiting region W2 is larger than that of the first light exiting region W1. The light ray of the second light emitting area W2 is emitted from the light incident surface 100a to the first light emitting surface 100b and the second light emitting surface 100 c.
That is to say, after the light emitted by the light source chip 201 passes through the double-head lens 2021, the light intensity is concentrated in the second light exiting area W2, so that the light passing through the first light exiting surface 100b and the second light exiting surface 100c is increased, thereby increasing the utilization rate of the effective light; the light intensity of the first light emitting area W1 is weaker, so that the light ray perpendicular to the light incident surface 100a is reduced, the light ray emitted from the third light emitting surface 100d is reduced, and the light leakage phenomenon is improved.
As shown in fig. 2, for example, the light rays 11 and 12 are two perpendicular light rays emitted by the light source chip 201 and directed to the first light emitting area W1, and the light rays 11 and 12 are deflected to the second light emitting areas W2 on both sides after passing through the double-headed lens 2021. The light beam 11 passes through the light incident micro-prism structure 1002 on the surface of the light incident surface 100a and is emitted to the first light emitting surface 100b, refracted out of the wedge-shaped light guide plate 100 on the first light emitting surface 100b and emitted to the inverse prism film 300, and is collimated by the inverse prism film 300 and emitted out of the backlight module. The light 12 passes through the light entrance micro-prism structure 1002 and is emitted to the second light emitting surface 100c, refracted out of the wedge-shaped light guide plate 100 on the second light emitting surface 100c and is emitted to the reflective film 400, reflected by the reflective film 400 and emitted to the first light emitting surface 100b from the second light emitting surface 100c, refracted out of the wedge-shaped light guide plate 100 on the first light emitting surface 100b and is emitted to the inverse prism film 300, and is collimated by the inverse prism film 300 and emitted out of the backlight module.
In this embodiment, the light adjusting layer 202 may deflect at least a portion of the light emitted by the light source chip 201 and directed to the third light-emitting surface 100d to the first light-emitting surface 100b and the second light-emitting surface 100c, so as to increase the light-emitting amount of the first light-emitting surface 100b and the second light-emitting surface 100c, and reduce the light-emitting amount of the third light-emitting surface 100d, thereby improving the problem of serious light leakage of the wedge-shaped light guide plate and increasing the light utilization rate of the backlight module.
In the embodiment of the invention, the method for forming the batwing-shaped light beam by the light source module comprises the step of plating a reflecting layer on each of the upper surface and the lower surface of the light source chip besides the encapsulated hemispherical lens and the free-form surface lens, and the specific explanation is as follows.
Referring to fig. 8, fig. 8 is a cross-sectional view of a light source module in a backlight module according to a second embodiment of the present disclosure. The structures of the wedge-shaped light guide plate, the inverse prism film and the reflection film in the backlight module of this embodiment are the same as those in the first embodiment, and are not described herein again. The present embodiment is different from the first embodiment only in that: the light ray adjusting layer 202 of this embodiment is a reflective layer, the reflective layer includes a first reflective layer 2022 and a second reflective layer 2023, the light source chip 201 further includes a back surface 201c opposite to the front surface 201a, the first reflective layer 2022 is disposed on the front surface 201a of the light source chip 201, and the second reflective layer 2023 is disposed on the back surface 201c of the light source chip 201.
For better light-emitting effect, the orthographic projection of the first reflecting layer 2022 on the base plate 203 is overlapped with the orthographic projection of the light source chip 201 on the base plate 203, and the orthographic projection of the light source chip 201 on the base plate 203 falls within the range of the orthographic projection of the second reflecting layer 2023 on the base plate 203. That is, the second reflective layer 2023 may be disposed corresponding to the light source chip 201, or may be disposed on the surface of the bottom plate 203 in a whole layer. Thus, the high-angle light emitted from the side surface 201b by the light source chip 201 is not affected by the first reflective layer 2022.
The first reflective layer 2022 and the second reflective layer 2023 may be semi-transparent and semi-reflective layers, or may be opaque reflective layers. In this embodiment, the first reflective layer 2022 is a transflective layer, and the second reflective layer 2023 is an opaque reflective layer.
A part of the light emitted from the light source chip 201 is reflected by the first reflective layer 2022 and the second reflective layer 2023, and then emitted from the side surface 201b of the light source chip 201 to form a batwing-shaped light beam, where the batwing-shaped light beam includes a first light exit area W1 and a second light exit area W2. At least a part of the light emitted from the light source chip 201 from the first light exiting region W1 to the third light exiting surface 100d changes the light path through the first reflective layer 2022 and the second reflective layer 2023 and is deflected toward the second light exiting region W2. That is, after the light emitted from the light source chip 201 passes through the first reflective layer 2022 and the second reflective layer 2023, the light intensity is concentrated in the second light exiting region W2, so that the light passing through the first light exiting surface 100b and the second light exiting surface 100c is increased, thereby increasing the utilization rate of the effective light; the light intensity of the first light emitting area W1 is weak, so that the light perpendicular to the light incident surface 100a is reduced, the light emitted from the third light emitting surface 100d is reduced, and the light leakage phenomenon is improved.
It is to be understood that the angular ranges of the first light exiting region W1 and the second light exiting region W2 of the present embodiment may be the same as those of the first embodiment, or may be specifically set according to actual situations. The light leakage improving principle of the backlight module of this embodiment is the same as that of the first embodiment, and is not described herein again.
In the embodiment of the present invention, the method for forming the batwing-shaped light beam by the light source module further includes disposing a polarizing layer on the front surface of the light source chip, which is specifically described as follows.
Referring to fig. 9, fig. 9 is a cross-sectional view of a light source module in a backlight module according to a third embodiment of the present invention. The structures of the wedge-shaped light guide plate, the reverse prism film and the reflective film in the backlight module of this embodiment are the same as those in the first embodiment, and are not described herein again. The present embodiment is different from the first embodiment only in that: the light adjusting layer 202 of this embodiment is a first polarizing layer 2024, and the first polarizing layer 2024 is disposed on the front surface 201a of the light source chip 201, wherein an orthographic projection of the first polarizing layer 2024 on the bottom plate 203 coincides with an orthographic projection of the light source chip 201 on the bottom plate 203.
The light emitted from the light source chip 201 is emitted through the first polarization layer 2024 to form a batwing-shaped light beam, which includes a first light exit area W1 and a second light exit area W2. The first polarizing layer 2024 itself is a prism structure, and includes a first prism structure 2024a and a second prism structure 2024b arranged in a mirror image, and top ends of the first prism structure 2024a and the second prism structure 2024b are respectively inclined to a direction approaching the second light exiting area W2. Therefore, the light emitted from the light source chip 201 is deflected toward the second light exiting region W2 by the first prism structure 2024a and the second prism structure 2024 b. That is to say, in the backlight module of this embodiment, at least a portion of the light emitted by the light source chip 201 from the first light emitting area W1 to the third light emitting area 100d is changed in path by the first polarizing layer 2024 and deflected to the second light emitting area W2, so that the light intensity is concentrated in the second light emitting area W2, and the light of the second light emitting area W2 is emitted from the light incident surface 100a to the first light emitting surface 100b and the second light emitting surface 100c, thereby increasing the utilization rate of the effective light; the light intensity of the first light emitting area W1 is weak, so that the light perpendicular to the light incident surface 100a is reduced, the light emitted from the third light emitting surface 100d is reduced, and the light leakage phenomenon is improved.
In the embodiment of the present invention, the light source module may also form a side-wing beam, that is, the light beam emitted by the light source module is deflected toward the first light emitting surface or the second light emitting surface, so as to increase the light emitting amount of the first light emitting surface or the second light emitting surface and reduce the light emitting amount of the third light emitting surface, which is described in detail below.
Referring to fig. 10 and 11, fig. 10 is a schematic structural diagram of a backlight module according to a fourth embodiment of the disclosure, and fig. 11 is a cross-sectional view of a light source module according to a fourth embodiment of the disclosure. The structures of the wedge-shaped light guide plate, the reverse prism film and the reflective film in the backlight module of this embodiment are the same as those in the first embodiment, and are not described herein again. In this embodiment, the light source assembly 200 includes a base plate 203, a light source chip 201, a light adjusting layer 202, and a phosphor layer 204. The present embodiment is different from the first embodiment only in that: in the light source module 200 of this embodiment, the light ray adjusting layer 202 is a side-biased lens 2025, that is, a free-form lens with an optical axis biased to one side, and light emitted from the light source chip 201 passes through the side-biased lens 2025 to form a side-wing beam. Specifically, the surface of the side-deflecting lens 2025 facing away from the light source chip 201 is an arc surface, and the curvature of the arc surface on the side close to the first light emitting surface 100b is greater than the curvature of the arc surface on the side close to the second light emitting surface 100c, so that the side-airfoil light beam deflects to the first light emitting surface 100 b; or the curvature of the arc surface on the side close to the first light-emitting surface 100b is smaller than the curvature of the arc surface on the side close to the second light-emitting surface 100c, so that the side wing-shaped light beam deflects to the side of the second light-emitting surface 100 c.
Referring to fig. 11, the light emitted from the light source chip 201 is deflected to one side by the side deflecting lens 2025, so as to form a side-wing light beam, where the side-wing light beam includes a first light emitting area W1 and a second light emitting area W2, and a plane perpendicular to the light incident surface 100a and parallel to the second light emitting surface 100c is a vertical plane, and an included angle between a light emitted from the second light emitting area W2 to the light incident surface 100a and the vertical plane is greater than an included angle between a light emitted from the first light emitting area W1 to the light incident surface 100a and the vertical plane.
Further, an angle between a light ray, which is emitted from the first light exiting region W1 toward the light incident surface 100a, and the vertical plane may range from 0 ° to 30 °, and an angle between a light ray, which is emitted from the second light exiting region W2 toward the light incident surface 100a, and the vertical plane may range from 30 ° to 60 °.
If the light source module 200 is disposed in such a manner that the side profile light beam is deflected to one side of the first light emitting surface 100b, the second light emitting area W2 is located on one side of the first light emitting area W1 close to the first light emitting surface 100 b; if the light source module 200 is disposed in such a manner that the side profile light beam is deflected to one side of the second light emitting surface 100c, the second light emitting area W2 is located on one side of the first light emitting area W1 close to the second light emitting surface 100 c.
In this embodiment, the side wing light beam formed by the light source module 200 is deflected to the first light emitting surface 100 b. After the light emitted by the light source chip 201 passes through the side-bias lens 2025, at least a portion of the light originally emitted to the first light emitting area W1 changes the light path and deflects toward the second light emitting area W2, so that the light intensity is concentrated on the second light emitting area W2, the light emitting amount of the first light emitting surface 100b is increased, and the light intensity of the first light emitting area W1 is weaker, thereby reducing the light perpendicularly incident to the light incident surface 100 a.
As shown in fig. 10, for example, the light ray 13 is a vertical light ray emitted by the light source chip 201 and emitted toward the first light emitting area W1, the light ray 13 passes through the lateral shift lens 2025 and then is deflected to be close to the first light emitting surface 100b, the light ray 13 passes through the light incident micro-prism structure 1002 on the surface of the light incident surface 100a and is emitted toward the first light emitting surface 100b, the light ray 13 is refracted out of the wedge-shaped light guide plate 100 at the first light emitting surface 100b and emitted toward the inverse prism film 300, and the light ray is collimated by the inverse prism film 300 and then emitted out of the backlight module.
In this embodiment, at least a part of the light emitted from the light source chip 201 from the first light exiting region W1 to the third light exiting surface 100d is changed in light path by the side-polarizing lens 2025 and deflected toward the second light exiting region W2. It can be understood that the angle of the light emitted by the light source chip 201 after passing through the side-bias lens 2025 is related to the optical axis direction of the side-bias lens 2025, and by properly adjusting the optical axis direction of the side-bias lens 2025, the light emitted by the light source chip 201 after passing through the side-bias lens 2025 is reduced in the light emitted to the first light-emitting area W1, and at the same time, the light emitted to the second light-emitting area W2 is increased.
In an embodiment of the present invention, the method for forming a side-wing light beam by using the light source module further includes disposing a polarizing layer on a front surface of the light source chip, which is specifically described below.
Referring to fig. 12, fig. 12 is a cross-sectional view of a light source module in a backlight module according to a fifth embodiment of the present invention. The structures of the wedge-shaped light guide plate, the reverse prism film and the reflective film in the backlight module of this embodiment are the same as those in the first embodiment, and are not described herein again. The present embodiment is different from the first embodiment only in that: the light adjusting layer 202 of this embodiment is a second polarizing layer 2026, and the second polarizing layer 2026 is disposed on the front surface 201a of the light source chip 201, wherein an orthogonal projection of the second polarizing layer 2026 on the bottom plate 203 coincides with an orthogonal projection of the light source chip 201 on the bottom plate 203.
The light emitted by the light source chip 201 passes through the second polarizing layer 2026 and then forms a side-profile light beam, which includes a first light exiting region W1 and a second light exiting region W2. The second polarizing layer 2026 itself is a prism structure including a third prism structure 2026a, and a tip of the third prism structure 2026a is inclined toward the second light exiting region W2. Therefore, the light emitted from the light source chip 201 is deflected toward the second light exiting region W2 through the third prism structure 2026 a. That is to say, in the backlight module of this embodiment, at least a portion of the light emitted by the light source chip 201 from the first light emitting area W1 to the third light emitting area 100d is changed in path by the third polarizer 2026 and deflected to the second light emitting area W2, so that the light intensity is concentrated in the second light emitting area W2, and the light of the second light emitting area W2 is emitted from the light incident surface 100a to the first light emitting surface 100b or the second light emitting surface 100c, thereby increasing the utilization rate of the effective light; the light intensity of the first light emitting area W1 is weak, so that the light perpendicular to the light incident surface 100a is reduced, that is, the light emitted from the third light emitting surface 100d is reduced, and the light leakage phenomenon is improved.
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the description of the above embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (13)
1. A backlight module, comprising:
the wedge-shaped light guide plate comprises a light incident surface, a first light emitting surface and a second light emitting surface which are oppositely arranged and respectively connected with the light incident surface, and a third light emitting surface which is oppositely arranged with the light incident surface and is connected with the first light emitting surface and the second light emitting surface; the first light-emitting surface and the second light-emitting surface are arranged in a relatively inclined manner;
the light source assembly is arranged on one side of the light inlet surface of the wedge-shaped light guide plate and comprises a light source chip and a light ray adjusting layer, and at least one part of the light ray adjusting layer is positioned on one side, facing the light inlet surface, of the light source chip;
at least one part of light emitted by the light source chip and emitted to the third light-emitting surface changes the path of the light through the light adjusting layer and emits the light to at least one of the first light-emitting surface and the second light-emitting surface.
2. The backlight module according to claim 1, wherein the light source module is parallel to the light incident surface, the light beam emitted by the light source module includes a first light emitting area and a second light emitting area located at least on one side of the first light emitting area, an included angle between a vertical plane and a light ray emitted from the second light emitting area to the light incident surface is larger than an included angle between a vertical plane and a light ray emitted from the first light emitting area to the light incident surface, and the vertical plane is a plane perpendicular to the light incident surface and parallel to the second light emitting surface;
the light of the second light emergent area irradiates to at least one of the first light emergent surface and the second light emergent surface from the light incident surface, and the light emergent quantity of the second light emergent area is larger than that of the first light emergent area.
3. The backlight module according to claim 2, wherein an angle between a light ray emitted from the first light emitting region to the light incident surface and the vertical plane is in a range of 0 ° to 30 °, and an angle between a light ray emitted from the second light emitting region to the light incident surface and the vertical plane is in a range of 30 ° to 60 °.
4. The backlight module according to claim 2, wherein the light source chip comprises a front surface facing the light incident surface and a side surface located around the front surface and connected to the front surface, wherein the light ray adjusting layer covers at least the front surface.
5. The backlight module according to claim 4, wherein the light adjusting layer is an optical lens, the optical lens covers are disposed on the front surface and the side surfaces, and a surface of the optical lens facing away from the light source chip is at least one arc surface; at least one part of light emitted by the light source chip from the first light emitting area to the third light emitting area changes the path of the light through the optical lens and deflects to the second light emitting area.
6. The backlight module according to claim 5, wherein a surface of the optical lens facing away from the light source chip is an arc surface, a curvature of the arc surface on a side close to the first light emitting surface is larger than a curvature of the arc surface on a side close to the second light emitting surface, and the second light emitting area is located on a side of the first light emitting area close to the first light emitting surface; alternatively, the first and second liquid crystal display panels may be,
the curvature of one side, close to the first light-emitting surface, of the cambered surface is smaller than that of one side, close to the second light-emitting surface, of the cambered surface, and the second light-emitting area is located on one side, close to the second light-emitting surface, of the first light-emitting area.
7. The backlight module according to claim 5, wherein the surface of the optical lens facing away from the light source chip is two intersecting curved surfaces, an intersecting line exists between the two curved surfaces at the intersecting position, and a groove is formed at the intersecting line on the surface of the optical lens facing away from the light source chip;
The two cambered surfaces are arranged in an axisymmetric mode by taking the intersection line as an axis, and the second light-emitting areas are arranged on two sides of the first light-emitting area in an axisymmetric mode by taking the intersection line as an axis.
8. The backlight module according to claim 4, wherein the light adjusting layer is a reflective layer, the reflective layer comprises a first reflective layer and a second reflective layer, the first reflective layer is disposed on a front surface of the light source chip, and the second reflective layer is disposed on a side of the light source chip opposite to the light incident surface, wherein at least a portion of the light emitted from the light source chip and directed from the first light emitting area to the third light emitting area is changed in path by the reflective layer and deflected toward the second light emitting area.
9. The backlight module according to claim 4, wherein the light adjusting layer is a polarizing layer disposed on the front surface of the light source chip, and at least a portion of the light emitted from the light source chip and directed from the first light emitting area to the third light emitting area is changed in path by the polarizing layer and deflected toward the second light emitting area.
10. The backlight module as claimed in claim 1, wherein a distance between an end of the first light emitting surface away from the light incident surface and an end of the second light emitting surface away from the light incident surface is smaller than a distance between an end of the first light emitting surface close to the light incident surface and an end of the second light emitting surface close to the light incident surface.
11. The backlight module according to claim 1, wherein a light exit microstructure is disposed on a surface of at least one of the first light exit surface and the second light exit surface, and a distribution density of the light exit microstructures is sequentially increased from the light entrance surface to the third light exit surface.
12. The backlight module as claimed in claim 1, wherein the wedge-shaped light guide plate further comprises two oppositely disposed side surfaces, and the light incident surface is provided with light incident micro-prism structures extending from one side surface of the wedge-shaped light guide plate to the other side surface or extending from the first light emergent surface to the second light emergent surface.
13. The backlight module as claimed in claim 1, further comprising a reverse prism film disposed on one side of the first light emitting surface and a reflective film disposed on one side of the second light emitting surface, wherein one side of the reverse prism film on which the micro-prism structure is disposed faces the first light emitting surface.
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| CN206234698U (en) * | 2016-08-16 | 2017-06-09 | 合肥京东方显示光源有限公司 | A kind of backlight module and display device |
| CN111552119A (en) * | 2020-06-02 | 2020-08-18 | 深圳创维－Rgb电子有限公司 | Lens film, light source assembly, backlight module and display device |
| CN113238314A (en) * | 2021-05-06 | 2021-08-10 | 苏州晶智科技有限公司 | Wedge-shaped light guide plate for collimating backlight module and collimating backlight module thereof |
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