CN113204070B - Backlight module and double-vision display device - Google Patents
Backlight module and double-vision display device Download PDFInfo
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- CN113204070B CN113204070B CN202110439659.7A CN202110439659A CN113204070B CN 113204070 B CN113204070 B CN 113204070B CN 202110439659 A CN202110439659 A CN 202110439659A CN 113204070 B CN113204070 B CN 113204070B
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- 208000003164 Diplopia Diseases 0.000 title abstract description 8
- 208000029444 double vision Diseases 0.000 title abstract description 8
- 230000009977 dual effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 16
- 239000004417 polycarbonate Substances 0.000 description 7
- 208000004350 Strabismus Diseases 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- 239000004713 Cyclic olefin copolymer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000012788 optical film Substances 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 150000001925 cycloalkenes Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module, comprising: the light source device comprises a first light guide plate, a first light source, a prism sheet, a second light guide plate and a second light source, wherein the first light source is arranged on a first light inlet surface of the first light guide plate, the prism sheet is arranged on a first light outlet surface of the first light guide plate, a prism unit of the prism sheet is arranged on the first light outlet surface, the second light source is arranged on a second light inlet surface of the second light guide plate, and a second light outlet surface of the second light guide plate is arranged on the first light guide surface. The backlight module and the double-vision display device can lighten one light source or both light sources according to actual requirements, so that the display device can watch pictures at a single oblique view angle or watch different pictures at a double oblique view angle, the development of the double-vision display device is realized, convenience is brought to users, and the double-vision display device has a very good application prospect.
Description
Technical Field
The present invention relates to backlight modules, and particularly to a backlight module and a dual-view display device.
Background
The backlight module is a backlight module for providing a backlight source component in the display product, and the backlight quality determines important parameters such as brightness, uniformity of emergent light, color level and the like of the display, and determines the luminous effect of the display to a great extent. Generally, backlight modules can be divided into direct-type backlight modules and side-entry type backlight modules, and the side-entry type backlight modules are increasingly used in the existing display devices because they can make the product thinner. The side light-in type backlight module generally comprises a light guide plate, a light source positioned on the light-in surface of the light guide plate and an optical film positioned on the light-out surface of the light guide plate, wherein light beams emitted by the light source are guided into the whole light guide plate after entering the light guide plate from the light-in surface according to the principle of total reflection, and a plurality of microstructures are arranged on the bottom surface and the light-out surface of the light guide plate to destroy total reflection of the light, so that the light beams are emitted from the light-out surface of the light guide plate, and the light beams emitted from the light-out surface pass through the optical film positioned above the light guide plate to form a surface light source required by a display.
In the prior art, the backlight module can only realize the function of providing a required area light source, and is combined to the display screen, namely, only display of a single picture can be realized, so that the display screen can uniformly watch the picture from the view angle. However, when the vehicle is actually used, the user may have different use requirements according to different application scenarios, such as a requirement for displaying a navigation screen for a driver and other screens for a co-driver and passengers for a vehicle-mounted central control display screen. The backlight module in the prior art can not achieve the function of enabling the same display screen to display different pictures according to different visual angles, and can not bring convenience to users. Accordingly, there is a need for improvements in the art that overcome the shortcomings of the prior art.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a backlight module and a dual-view display device, wherein the backlight module has a dual-axis emission angle, so as to realize the display of different images by the left and right dual-view angles of the display device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a backlight module and a dual-view display device comprise:
the first light guide plate is provided with a first light-emitting surface and a first light-guiding surface which are opposite to each other, and a first light-entering surface connected between the first light-emitting surface and the first light-guiding surface, wherein a first light source is arranged on the first light-entering surface;
a prism sheet disposed on the first light-emitting surface of the first light guide plate, the prism sheet having a prism light-emitting surface and a plurality of prism units arranged opposite to the prism light-emitting surface, the prism units being disposed on the first light-emitting surface;
the second light guide plate is provided with a second light emitting surface, a second light guide surface and a second light incident surface, wherein the second light emitting surface and the second light guide surface are opposite to each other, the second light incident surface is connected between the second light emitting surface and the second light guide surface, a second light source is arranged on the second light incident surface, and the second light emitting surface is just opposite to the first light guide surface.
As a further improvement of the present invention, the prism unit has a first surface and a second surface on both sides, and an included angle formed between the first surface and the second surface is θ1, and θ1 is 50 ° or more and 60 ° or less.
As a further improvement of the invention, the critical angle of total reflection of the first light guide plate is theta 2, light emitted by the first light source is refracted through the first light incident surface and enters the first light guide plate, total reflection is generated in the first light guide plate until the first incident angle of the light on the first light emergent surface is smaller than or equal to theta 2, the light is refracted through the first light emergent surface and is refracted through the prism unit of the prism sheet and is emitted from the prism light emergent surface to form first light distribution, the first light distribution deflects towards the direction of the first light source, and the first light distribution has a first peak with a distribution angle of 15 DEG to theta 3 DEG to 35 DEG based on a perpendicular line perpendicular to the prism light emergent surface.
As a further improvement of the invention, the critical angle of total reflection of the second light guide plate is theta 4, the light emitted by the second light source is refracted through the second light incident surface and enters the second light guide plate, total reflection is generated in the second light guide plate until the second incident angle of the light on the second light emergent surface is smaller than or equal to theta 4, the light is refracted through the second light emergent surface and then sequentially refracted through the first light guide plate and the prism units of the prism sheet, and then is emitted from the prism light emergent surface to form second light distribution, the second light distribution deflects towards the direction of the second light source, and the second light distribution has a second peak with a distribution angle of-35 DEG to theta 5 to-15 DEG based on the perpendicular line perpendicular to the prism light emergent surface.
As a further improvement of the invention, the first light guide surface is provided with a first microstructure, the first microstructure is provided with a plurality of first inclined planes which are arranged, and one end of each first inclined plane, which is far away from the first light source, is inclined towards the first light emitting surface.
As a further improvement of the invention, the second light guide surface is provided with a second microstructure, the second microstructure is provided with a plurality of second inclined planes which are arranged, and one end of each second inclined plane, which is far away from the second light source, is inclined towards the second light emitting surface.
As a further improvement of the invention, the first light source and the second light source are respectively positioned at two opposite side ends of the backlight module.
As a further improvement of the invention, the first light-emitting surface is provided with a first lens array structure, the second light-emitting surface is provided with a second lens array structure, and the first lens array structure and the second lens array structure are columnar or conical structures which are arranged in a plurality of ways.
As a further improvement of the present invention, the light guide plate further includes a reflective sheet disposed on the second light guide surface.
The invention also provides a double-view display device which comprises the backlight module.
The beneficial effects of the invention are as follows: the invention provides a backlight module and a double-view display device, wherein the backlight module is provided with a double-layer light guide plate, namely a first light guide plate and a second light guide plate which are overlapped, a prism sheet is arranged on the first light guide plate, light emitted by a first light source positioned on a first light inlet surface of the first light guide plate can be refracted out by the prism sheet, and the light emergent angle is concentrated in a certain angle range, so that the display device can see the picture display from an oblique view angle in the angle range on the right side of a vertical line; the light emitted by the second light source on the second light incident surface of the second light guide plate can be refracted out by the prism sheet, and the light emergent angle is concentrated in an angle range, so that the display device can see another picture display from the oblique view angle of the left side of the vertical line in the angle range; one or both of the light sources can be lightened according to the actual requirement by switching the electric signals, so that the display device can watch pictures at a single strabismus angle or different pictures at a double strabismus angle, the development of the double-vision display device is realized, convenience is brought to users, and the display device has a very good application prospect.
Drawings
FIG. 1 is a front view of a backlight module according to the present invention;
FIG. 2 is a schematic diagram of a portion of a backlight module according to the present invention;
FIG. 3 is an enlarged view of FIG. 2A in accordance with the present invention;
FIG. 4 is a left side view of the backlight module of the present invention;
FIG. 5 is a schematic diagram of a path of light emitted from a first light source of the backlight module according to the present invention;
fig. 6 is a schematic diagram of a path of light emitted by the second light source of the backlight module according to the present invention.
The following description is made with reference to the accompanying drawings:
1-a first light guide plate; 101—a first light exit surface;
102—a first light guiding surface; 1021-a first bevel;
103—a first light incident surface; 2—a first light source;
3—a prism sheet; 301—a prism light-out face;
302—a prism unit; 4-a second light guide plate;
401-a second light exit face; 402—a second light guide surface;
4021—a second bevel; 403—a second light incident surface;
5—a second light source; 6-a reflector plate.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 6, the present invention provides a backlight module and a dual-view display device, comprising: the light guide plate comprises a first light guide plate 1, a first light source 2, a prism sheet 3, a second light guide plate 4, a second light source 5 and a reflecting sheet 6, wherein the prism sheet 3, the first light guide plate 1, the second light guide plate 4 and the reflecting sheet 6 are sequentially overlapped from top to bottom.
The first light guide plate 1 has a first light exit surface 101 and a first light guide surface 102 which are opposite to each other, a first light entrance surface 103 connected between the first light exit surface 101 and the first light guide surface 102, the first light source 2 is disposed on the first light entrance surface 103, and the first light source 2 is an LED. The first light guide plate 1 is a specular reflection type light guide plate, and the first light guide plate 1 may be made of a transparent resin material, a PMMA (Polymethyl methacrylate polymethyl methacrylate) material, an optical material COP, a COC (Copolymers of cycloolefin cyclic olefin copolymer) material, or an optical grade PC (polycarbonate) material, etc., and in this embodiment, the first light guide plate 1 is made of a PC material. The critical angle of total reflection of the first light guide plate 1 is θ2, and the value of the critical angle of total reflection is different according to the characteristics of different materials, and the critical angle is expressed as:
PC materialThe refractive index of the material is n 1 =1.58, refractive index of air n 2 =1, and the critical angle θ2 of the first light guide plate 1 is calculated to be 39.2 °. After the light emitted by the first light source 2 is refracted by the first light incident surface 103 and enters the first light guide plate 1, the light with the incident angle exceeding 39.2 ° will be totally reflected and propagated inside the first light guide plate 1, and when the incident angle is lower than the critical angle 39.2 °, the light can be refracted to the outside through the first light emergent surface 101.
Referring to fig. 2 and 3, a first microstructure is disposed on the first light guiding surface 102, and the first microstructure has a plurality of first inclined planes 1021 arranged, and one end of the first inclined plane 1021 away from the first light source 2 is inclined towards the first light emitting surface 101. The light emitted by the first light source 2 into the first light guide plate 1 is totally reflected on the first inclined plane 1021, so that the incident angle of the light is continuously reduced until the incident angle of the light on the first light emitting surface 101 is smaller than or equal to the critical angle θ2, and then the light is refracted out of the first light emitting surface 101. In addition, the first inclined plane 1021 and the horizontal plane have an angle θ6, and the time for the light to reach the critical angle θ2 can be adjusted by changing the magnitude of θ6, where θ6 is set to 2 ° in the present embodiment.
For ease of understanding, reference to fig. 1 is defined as upper, lower, left, and right, respectively, and the side opposite to the front side is the front side with respect to fig. 1. In this embodiment, the first light source 2 is located on the first light incident surface 103 on the right side of the first light guide plate 1, and when the position of the first light source 2 is located at a different first light incident surface 103 of the first light guide plate 1, the first inclined plane 1021 should be correspondingly adjusted to correspond to the first light source 2, that is, it is required to satisfy that one end of the first inclined plane 1021 away from the first light source 2 is inclined towards the first light emergent surface 101.
Referring to fig. 2, the prism sheet 3 is disposed on the first light-emitting surface 101 of the first light guide plate 1, and the prism sheet 3 has a prism light-emitting surface 301 and a plurality of prism units 302 arranged in succession opposite to the prism light-emitting surface 301, and the prism units 302 are disposed opposite to the first light-emitting surface 101. Each of the prism units 302 is disposed in the front-rear direction, and the extending direction of the arrangement of the plurality of prism units 302 is the left-right direction, which is identical to the extending direction of the arrangement of the first inclined planes 1021. The prism unit 302 is tapered, having a first surface and a second surface on both sides thereof, and an angle formed between the first surface and the second surface is θ1, and θ1 is 50 ° or more and θ1 is or less than 60 °, and the critical angle θ2 of the PC material is used for the first light guide plate 1 according to the present embodiment, and the angle θ1 of the present embodiment is preferably set to 52 °.
When the first light source 2 is turned on, the light emitted by the first light source 2 is refracted through the first light incident surface 103 and enters the first light guide plate 1, and total reflection occurs in the first light guide plate 1, and continuously approaches the critical angle θ2, until the first incident angle of the light on the first light emergent surface 101 is smaller than or equal to θ2, the light is refracted through the first light emergent surface 101, and then refracted through the prism unit 302 of the prism sheet 3 and emitted through the prism light emergent surface 301 to form first light distribution. According to snell's law:
sinθ 1 *n 1 ＝sinθ 2 *n 2
wherein n is 2 Refractive index of air, n 1 As the refractive index of the medium, it can be obtained that the first light distribution is deflected towards the first light source 2, that is, the light is refracted on the right side of the normal line of the prism light-emitting surface 301, and the first light distribution has a first peak with a distribution angle of 15 ° or more and θ3 or less and 35 ° based on the perpendicular line perpendicular to the prism light-emitting surface 301, that is, the light intensity is maximum in the angle range of 15 ° to 35 °. By adopting the technical scheme, the first light source 2 is lightened through the switching of the electric signals, the light emergent angle is concentrated at 15-35 degrees, and the display device can see the picture display from the right oblique view angle of the vertical line within 15-35 degrees.
Referring to fig. 5, for example, when light enters the first light guide plate 1 from the first light incident surface 103 at a refraction angle of 27 °, reaches the first light guide surface 102, and is totally reflected at a reflection angle of 58 ° until the incident angle reaches 38 ° on the first light emergent surface 101, the refraction angle is 75 °, and then is refracted by the prism unit 302 of the prism sheet 3, and finally is emitted from the prism light emergent surface 301 at a refraction angle of 31 °.
Referring to fig. 2 and 3, the second light guide plate 4 has a second light emitting surface 401 and a second light guiding surface 402 opposite to each other, and a second light incident surface 403 connected between the second light emitting surface 401 and the second light guiding surface 402, and the second light emitting surface 401 is opposite to the first light guiding surface 102. The second light source 5 is disposed on the second light incident surface 403, and the second light source 5 is an LED. The second light guide plate 4 is a specular reflection type light guide plate, and the material of the second light guide plate 4 may be a transparent resin material, a PMMA material, an optical material COP, a COC material, or an optical grade PC material, etc., and in this embodiment, the second light guide plate 4 is a PC material. The critical angle at which the second light guide plate 4 totally reflects is θ4, and θ4 is 39.2 °. After the light emitted by the second light source 5 is refracted by the second light incident surface 403 and enters the second light guide plate 4, the light with the incident angle exceeding 39.2 ° will be totally reflected and propagated inside the second light guide plate 4, and when the incident angle is lower than the critical angle 39.2 °, the light can be refracted to the outside through the second light emergent surface 401.
The second light guiding surface 402 is provided with a second microstructure, the second microstructure has a plurality of second inclined planes 4021 arranged, and one end of the second inclined plane 4021, which is far away from the second light source 5, is inclined toward the second light emitting surface 401. The light emitted by the second light source 5 into the second light guide plate 4 is totally reflected on the second inclined plane 4021, so that the incident angle of the light is continuously reduced until the incident angle of the light on the second light emitting surface 401 is smaller than or equal to the critical angle θ4, and then the light is refracted out of the second light emitting surface 401. In addition, the second bevel 4021 has an angle θ7 with the horizontal plane, and the time for the light to reach the critical angle θ4 can be adjusted by changing the magnitude of θ7, where θ7 is set to 4 ° in this embodiment.
In this embodiment, the extending direction of the arrangement of the second inclined plane 4021 is consistent with the extending direction of the arrangement of the prism units 302, and it is required to satisfy that the first light source 2 and the second light source 5 are respectively located at two opposite side ends of the backlight module, and in this embodiment, the second light source 5 is located on the second light incident surface 403 on the left side of the second light guide plate 4.
When the second light source 5 is turned on, the light emitted by the second light source 5 is refracted through the second light incident surface 403 and enters the second light guide plate 4, total reflection occurs in the second light guide plate 4, until the second incident angle of the light on the second light emergent surface 401 is smaller than or equal to theta 4, the light is refracted and emitted through the second light emergent surface 401, and then is refracted through the prism units 302 of the first light guide plate 1 and the prism sheet 3, and is emitted from the prism light emergent surface 301 to form second light distribution, according to the Snell's law, the second light distribution deflects towards the second light source 5, namely, the light is refracted at the left side of the normal line of the prism light emergent surface 301, and the second light distribution has a second peak with a distribution angle of-35 DEG to-15 DEG, namely, the maximum light intensity within an angle range of-35 DEG to-15 DEG, based on the perpendicular line perpendicular to the prism light emergent surface 301. The negative value of the second light distribution angle is expressed with respect to the first light distribution angle. By adopting the technical scheme, the second light source 5 is lightened through the switching of the electric signals, the light emergent angle is concentrated at-35 degrees to-15 degrees, and the display device can see the picture display from the left oblique view angle of the vertical line within-35 degrees to-15 degrees.
Referring to fig. 6, for example, when light enters the second light guide plate 4 from the second light incident surface 403 at a refraction angle of 24 °, reaches the second light guide surface 402, and then is totally reflected at a reflection angle of 61 ° until reaching 34 ° at the second light incident surface 401, enters the first light guide plate 1, then exits the first light guide plate 1 at a refraction angle of 69 °, is refracted by the prism unit 302 of the prism sheet 3, and finally exits from the prism light exit surface 301 at a refraction angle of-28 °.
When the first light source 2 and the second light source 5 are simultaneously lighted, the light distribution is the superposition of independently lighting the first light source 2 and independently lighting the second light source 5, at this time, the display device can see one picture display within 15-35 degrees from the right oblique view angle of the vertical line, and can see the other picture display within-35-15 degrees from the left oblique view angle of the vertical line.
Referring to fig. 1, the reflection sheet 6 is disposed on the second light guide surface 402, and the reflection sheet 9 is not limited to 3M ESRSeries, and any medium having reflection characteristics may be used as the reflection sheet 9.
Referring to fig. 4, a first lens array structure is disposed on the first light emitting surface 101, and a second lens array structure is disposed on the second light emitting surface 401, where the first lens array structure and the second lens array structure are cylindrical or conical structures arranged in several rows, and the arrangement manner may be continuous or intermittent. In this embodiment, the first lens array structure and the second lens array structure each adopt a continuously arranged cylindrical structure, the independent cylindrical structures are all arranged along the left-right direction, and the extending directions of the plurality of cylindrical structures are the front-back directions, and the extending directions of the arrangements are perpendicular to the extending directions of the arrangements of the prism units 302. The first lens array structure and the second lens array structure can gather light in the front-back side direction, and the main purpose of the lens array structure is to enable the light to be gathered in the center as much as possible when the lens array structure is used, for example, the lens array structure is used for vehicle-mounted central control, and the influence of light reflection on a windshield on the sight can be effectively avoided.
The embodiment also provides a dual-view display device, which comprises the backlight module, and the specific structure of the backlight module refers to the embodiment. It should be noted that, the dual-view display device in this embodiment may be: and any product or part with a display function such as a vehicle-mounted central control screen, a notebook, a mobile phone and a tablet.
Therefore, the backlight module and the double-vision display device are provided with the double-layer light guide plates, namely the first light guide plate and the second light guide plate which are overlapped, the first light guide plate is provided with the prism sheet, light emitted by the first light source positioned on the first light inlet surface of the first light guide plate can be refracted out by the prism sheet, the light emitting angle is concentrated in a certain angle range, and the display device can see the picture display from the oblique view angle in the angle range on the right side of the vertical line; the light emitted by the second light source on the second light incident surface of the second light guide plate can be refracted out by the prism sheet, and the light emergent angle is concentrated in an angle range, so that the display device can see another picture display from the oblique view angle of the left side of the vertical line in the angle range; one or both of the light sources can be lightened according to the actual requirement by switching the electric signals, so that the display device can watch pictures at a single strabismus angle or different pictures at a double strabismus angle, the development of the double-vision display device is realized, convenience is brought to users, and the display device has a very good application prospect.
In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only of a preferred embodiment of the invention, which can be practiced in many other ways than as described herein, so that the invention is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.
Claims (3)
1. A backlight module, comprising: a first light guide plate (1) having a first light exit surface (101) and a first light guide surface (102) which are opposite to each other, and a first light entrance surface (103) connected between the first light exit surface (101) and the first light guide surface (102), wherein a first light source (2) is arranged on the first light entrance surface (103); a prism sheet (3) disposed on the first light-emitting surface (101) of the first light guide plate (1), the prism sheet (3) having a prism light-emitting surface (301) and a plurality of prism units (302) arranged opposite to the prism light-emitting surface (301), the prism units (302) being disposed on the first light-emitting surface (101); a second light guide plate (4) having a second light-emitting surface (401) and a second light-guiding surface (402) which are opposite to each other, and a second light-entering surface (403) connected between the second light-emitting surface (401) and the second light-guiding surface (402), wherein a second light source (5) is arranged on the second light-entering surface (403), and the second light-emitting surface (401) is arranged opposite to the first light-guiding surface (102);
the two sides of the prism unit (302) are provided with a first surface and a second surface, an included angle formed between the first surface and the second surface is theta 1, and theta 1 is more than or equal to 50 degrees and less than or equal to 60 degrees;
the critical angle of total reflection of the first light guide plate (1) is theta 2, light emitted by the first light source (2) is refracted through the first light incident surface (103) and enters the first light guide plate (1), total reflection occurs in the first light guide plate (1), after a first incident angle of the light on the first light emergent surface (101) is smaller than or equal to theta 2, the light is refracted through the first light emergent surface (101), and then refracted through the prism unit (302) of the prism sheet (3) and emitted out of the prism light emergent surface (301) to form first light distribution, the first light distribution deflects towards the direction of the first light source (2), and the first light distribution has a first peak with a distribution angle of 15 degrees to theta 3 degrees to 35 degrees based on a vertical line perpendicular to the prism light emergent surface (301);
the critical angle of total reflection of the second light guide plate (4) is theta 4, light emitted by the second light source (5) is refracted through the second light incident surface (403) and enters the second light guide plate (4), total reflection occurs in the second light guide plate (4), the light is refracted through the second light emergent surface (401) until a second incident angle of the light on the second light emergent surface (401) is smaller than or equal to theta 4, and then is refracted through the prism units (302) of the first light guide plate (1) and the prism sheet (3) in sequence, and then is emitted through the prism light emergent surface (301) to form second light distribution, the second light distribution deflects towards the direction of the second light source (5), and the second light distribution has a second peak with a distribution angle of-35 DEG theta-15 DEG based on a perpendicular line perpendicular to the prism light emergent surface (301);
the first light guide surface (102) is provided with a first microstructure, the first microstructure is provided with a plurality of first inclined planes (1021) which are arranged, and one end of each first inclined plane (1021) far away from the first light source (2) is inclined towards the first light emitting surface (101);
the second light guide surface (402) is provided with a second microstructure, the second microstructure is provided with a plurality of second inclined planes (4021) which are arranged, and one end of each second inclined plane (4021) far away from the second light source (5) is inclined towards the second light emitting surface (401); the first light source (2) and the second light source (5) are respectively positioned at two opposite side ends of the backlight module;
the first light-emitting surface (101) is provided with a first lens array structure, the second light-emitting surface (401) is provided with a second lens array structure, and the first lens array structure and the second lens array structure are cylindrical or conical structures which are arranged in a plurality of ways.
2. A backlight module according to claim 1, wherein: the light guide plate further comprises a reflecting sheet (6), and the reflecting sheet (6) is arranged on the second light guide surface (402).
3. A dual view display device, comprising: the backlight module according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110439659.7A CN113204070B (en) | 2021-04-23 | 2021-04-23 | Backlight module and double-vision display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110439659.7A CN113204070B (en) | 2021-04-23 | 2021-04-23 | Backlight module and double-vision display device |
Publications (2)
| Publication Number | Publication Date |
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| CN113204070A CN113204070A (en) | 2021-08-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251674A (en) * | 2007-02-19 | 2008-08-27 | 三菱电机株式会社 | Backlight device and transmissive display device |
| CN105487292A (en) * | 2016-01-15 | 2016-04-13 | 京东方科技集团股份有限公司 | Backlight module, display device and driving method thereof |
| CN111176016A (en) * | 2020-01-07 | 2020-05-19 | 京东方科技集团股份有限公司 | Backlight module and display device |
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| TWI421590B (en) * | 2010-09-17 | 2014-01-01 | Au Optronics Corp | Display device with switchable view angle and the backlight module thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251674A (en) * | 2007-02-19 | 2008-08-27 | 三菱电机株式会社 | Backlight device and transmissive display device |
| CN105487292A (en) * | 2016-01-15 | 2016-04-13 | 京东方科技集团股份有限公司 | Backlight module, display device and driving method thereof |
| CN111176016A (en) * | 2020-01-07 | 2020-05-19 | 京东方科技集团股份有限公司 | Backlight module and display device |
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