CN113204070A - Backlight module and double-vision display device - Google Patents
Backlight module and double-vision display device Download PDFInfo
- Publication number
- CN113204070A CN113204070A CN202110439659.7A CN202110439659A CN113204070A CN 113204070 A CN113204070 A CN 113204070A CN 202110439659 A CN202110439659 A CN 202110439659A CN 113204070 A CN113204070 A CN 113204070A
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- emitting surface
- light guide
- prism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 208000003164 Diplopia Diseases 0.000 title description 3
- 208000029444 double vision Diseases 0.000 title description 3
- 230000009977 dual effect Effects 0.000 claims abstract description 5
- 238000009826 distribution Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 description 16
- 239000004417 polycarbonate Substances 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- 239000004713 Cyclic olefin copolymer Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012788 optical film Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000000007 visual effect Effects 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
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- 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 module 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 incoming surface of the first light guide plate, the prism sheet is arranged on a first light outgoing surface of the first light guide plate, a prism unit of the prism sheet is arranged right opposite to the first light outgoing surface, the second light source is arranged on a second light incoming surface of the second light guide plate, and a second light outgoing surface of the second light guide plate is arranged right opposite to the first light guiding surface. According to the backlight module and the dual-view display device, one light source or both light sources can be lightened according to actual needs, so that the display device can watch pictures at a single oblique viewing angle or different pictures at dual oblique viewing angles, development of the dual-view display device is realized, convenience is brought to users, and the dual-view display device has a very good application prospect.
Description
Technical Field
The invention relates to the technical field of backlight modules, in particular to a backlight module and a dual-view display device.
Background
The backlight module provides a back light source component in a display product, the backlight quality determines important parameters of the display such as brightness, emergent light uniformity, color gradation and the like, and the light emitting effect of the display is determined to a great extent. Generally, the backlight module can be divided into a direct type backlight module and a side light type backlight module, and the side light type backlight module can make the product thinner, so the side light type backlight module is increasingly used by the existing display device. The side-incident backlight module generally includes a light guide plate, a light source located at the light incident surface of the light guide plate, and an optical film located at the light emitting surface of the light guide plate, wherein a light beam emitted from the light source enters the light guide plate from the light incident surface and is guided into the entire light guide plate according to the total reflection principle, a plurality of microstructures are disposed on the bottom surface and the light emitting surface of the light guide plate to destroy the total reflection of the light, so that the light beam exits from the light emitting surface of the light guide plate, and the light beam exiting from the light emitting surface passes through the optical film located above the light guide plate to form a surface light source required by the display.
Backlight unit can only realize providing the function of required area light source among the prior art, on the combination to the display screen, can only realize the demonstration of single picture promptly for the display screen is all unified from that visual angle observation picture. However, when the user is actually used, different use requirements are met according to different application scenes, for example, for an on-vehicle central control display screen, requirements for displaying a navigation screen for a driver and displaying other screens for a passenger in a co-driver are met. The backlight module in the prior art cannot achieve the function that the same display screen can display different pictures according to different visual angles, and cannot bring convenience to users. Accordingly, there is a need for improvements in the art that overcome the deficiencies in 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 axial emitting angle, so that the display device can display different images at left and right dual oblique viewing angles.
The technical scheme adopted by the invention for solving the technical problem is as follows: a backlight module and a dual-view display device include:
the first light guide plate is provided with a first light emitting surface, a first light guiding surface and a first light incident surface, wherein the first light emitting surface and the first light guiding surface are opposite to each other, the first light incident surface is connected between the first light emitting surface and the first light guiding surface, and a first light source is arranged on the first light incident surface;
the prism sheet is arranged on the first light-emitting surface of the first light guide plate, and is provided with a prism light-emitting surface and a plurality of arranged prism units opposite to the prism light-emitting surface, and the prism units are arranged right opposite to the first light-emitting surface;
the second light guide plate is provided with a second light emitting surface, a second light guiding surface and a second light incident surface, wherein the second light emitting surface and the second light guiding surface are opposite, the second light incident surface is connected between the second light emitting surface and the second light guiding surface, a second light source is configured on the second light incident surface, and the second light emitting surface is just opposite to the first light guiding surface.
As a further improvement of the present invention, both sides of the prism unit have a first surface and a second surface, and an included angle formed between the first surface and the second surface is θ 1, and θ 1 is 50 ° ≦ θ 1 ≦ 60 °.
As a further improvement of the present invention, a critical angle of total reflection of the first light guide plate is θ 2, light emitted by the first light source is refracted by the first light incident surface and enters the first light guide plate, and is totally reflected in the first light guide plate until a first incident angle of the light on the first light emitting surface is smaller than or equal to θ 2, the light is refracted by the first light emitting surface, and is refracted by the prism unit of the prism sheet and emitted by the prism light emitting surface to form a first light distribution, the first light distribution is deflected toward the first light source direction, and the first light distribution has a first peak with a distribution angle of θ 3 being greater than or equal to 15 ° and less than or equal to 35 ° with a perpendicular line perpendicular to the prism light emitting surface as a reference.
As a further improvement of the present invention, a critical angle of total reflection of the second light guide plate is θ 4, light emitted by the second light source is refracted by the second light incident surface and enters the second light guide plate, and is totally reflected in the second light guide plate until a second incident angle of the light on the second light emitting surface is smaller than or equal to θ 4, the light is refracted by the second light emitting surface, and is refracted by the prism units of the first light guide plate and the prism sheet in sequence, and then is emitted by the prism light emitting surface to form a second light distribution, the second light distribution is deflected toward the second light source direction, and a second peak with a distribution angle of θ 5 being smaller than or equal to-15 ° is formed in the second light distribution with a perpendicular line perpendicular to the prism light emitting surface as a reference.
As a further improvement of the present invention, a first microstructure is disposed on the first light guiding surface, the first microstructure has a plurality of first inclined surfaces arranged, and one end of the first inclined surface, which is far away from the first light source, is inclined toward the first light emitting surface.
As a further improvement of the present invention, a second microstructure is disposed on the second light guiding surface, the second microstructure has a plurality of second inclined surfaces arranged, and one end of the second inclined surface, which is far away from the second light source, is inclined toward the second light emitting surface.
As a further improvement of the present invention, the first light source and the second light source are respectively located at two opposite side ends of the backlight module.
As a further improvement of the present invention, a first lens array structure is disposed on the first light emitting surface, a second lens array structure is disposed on the second light emitting surface, and the first lens array structure and the second lens array structure are both a plurality of arranged cylindrical or conical structures.
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-vision display device which comprises the backlight module.
The invention has the beneficial effects that: the invention provides a backlight module and a double-view display device, wherein the backlight module is provided with double-layer light guide plates, namely a first light guide plate and a second light guide plate which are arranged in a superposed manner, and a prism sheet is arranged on the first light guide plate; the light emitted by the second light source on the second light incident surface of the second light guide plate can be refracted 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 an oblique angle in the angle range on the left side of the vertical line; one light source or both light sources can be lightened by switching the electric signals according to actual needs, so that the display device can watch pictures at a single oblique viewing angle or different pictures at double oblique viewing angles, the development of the double-view display device is realized, convenience is brought to users, and the double-view 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 view of a partial structure of a backlight module according to the present invention;
FIG. 3 is an enlarged view of A of FIG. 2 according to 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 by 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 a 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 emitting surface;
102-first light guide surface; 1021 — a first slope;
103-first incident surface; 2-a first light source;
3-prism sheet; 301-prism exit surface;
302-prism unit; 4-a second light guide plate;
401 — second light emitting surface; 402-second light guide surface;
4021-second bevel; 403-second incident surface;
5-a second light source; 6-reflecting sheet.
Detailed Description
A preferred embodiment of the present invention will be described in detail below 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, including: the backlight module 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 arranged in a stacked mode from top to bottom.
The first light guide plate 1 has a first light emitting surface 101 and a first light guiding surface 102 opposite to each other, and a first light incident surface 103 connected between the first light emitting surface 101 and the first light guiding surface 102, the first light source 2 is disposed on the first light incident surface 103, and the first light source 2 is an LED. The first light guide plate 1 is a mirror reflection type light guide plate, the first light guide plate 1 may be made of a transparent resin material, a PMMA (Polymethyl methacrylate) material, an optical material COP, a COC (copolymer of cyclic olefin copolymer) material, an optical grade PC (polycarbonate) material, or the like, and in this embodiment, the first light guide plate 1 is made of a PC material. The critical angle of the first light guide plate 1 for total reflection is θ 2, and the critical angle of total reflection is different according to the characteristics of different materials, and is expressed as:
and the refractive index of the PC material is n11.58, refractive index of air n2The critical angle θ 2 of the first light guide plate 1 was calculated to be 39.2 °. After the light emitted from 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 ° is totally reflected and propagates inside the first light guide plate 1, and when the incident angle is lower than the critical angle of 39.2 °, the light can be refracted to the outside through the first light emitting surface 101.
Referring to fig. 2 and 3, the first light guide surface 102 is provided with a first microstructure, the first microstructure has a plurality of first inclined surfaces 1021, and one end of the first inclined surfaces 1021 far away from the first light source 2 is inclined toward the first light emitting surface 101. The light emitted from the first light source 2 and entering the first light guide plate 1 is totally reflected on the first inclined surface 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 θ 2, and then the light is refracted out from the first light emitting surface 101. In addition, the included angle between the first inclined surface 1021 and the horizontal plane is θ 6, and the time for the light to reach the critical angle θ 2 can be adjusted by changing the size of θ 6, and θ 6 is set to 2 ° in this embodiment.
For ease of understanding, the upper, lower, left, and right with reference to fig. 1 are defined as an upper side, a lower side, a left side, and a right side, respectively, with respect to the side of fig. 1, a front side, and a side opposite to the front side, a rear side. The first light source 2 and the first inclined surface 1021 have a certain position corresponding relationship, 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 surface 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 surface 1021, which is far away from the first light source 2, inclines toward the first light emitting 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, the prism sheet 3 has a prism light emitting surface 301 and a plurality of prism units 302 arranged in series opposite to the prism light emitting surface 301, and the prism units 302 are disposed opposite to the first light emitting surface 101. Each prism unit 302 is arranged along 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 consistent with the extending direction of the arrangement of the first inclined surfaces 1021. The prism unit 302 has a tapered shape, and both sides thereof have a first surface and a second surface, the first surface and the second surface form an included angle θ 1, and 50 ° ≦ θ 1 ≦ 60 °, and the critical angle θ 2 of the PC material used for the first light guide plate 1 according to the present embodiment is preferably set to 52 °.
When the first light source 2 is turned on, 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, and is totally reflected in the first light guide plate 1 and continuously approaches the critical angle θ 2 until the first incident angle of the light on the first light emitting surface 101 is smaller than or equal to θ 2, the light is refracted by the first light emitting surface 101 and then emitted, and the light is refracted by the prism unit 302 of the prism sheet 3 and emitted from the prism light emitting surface 301 to form a first light distribution. According to snell's law:
sinθ1*n1＝sinθ2*n2
wherein n is2Is the refractive index of air, n1By means of the refractive index, it can be seen that the first light distribution is deflected in the direction of the first light source 2, i.e. light is refracted on the prism exit surface 301 from its normal right side, so that it is possible to obtain a light beam with a uniform distribution of light raysThe vertical line perpendicular to the prism light-emitting surface 301 is used as a reference, and the first light distribution has a first peak with a distribution angle of theta 3 being equal to or larger than 15 degrees and equal to or smaller than 35 degrees, namely, the light intensity is the maximum within the angle range of 15 degrees to 35 degrees. By adopting the technical scheme, the first light source 2 is lightened through switching of the electric signals, the light emitting angle is concentrated at 15-35 degrees, and the display device can see picture display within 15-35 degrees of the oblique viewing angle on the right side of the vertical line.
Referring to fig. 5, for example, after the light enters the first light guide plate 1 through the first light incident surface 103 at a refraction angle of 27 °, the light 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 emitting surface 101, the light is refracted at a refraction angle of 75 °, and then is refracted by the prism units 302 of the prism sheet 3, and finally is emitted from the prism light emitting 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, wherein the second light emitting surface 401 is disposed 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 mirror reflection type light guide plate, and the material thereof may also be a transparent resin material, a PMMA material, an optical material COP, a COC material, an optical grade PC material, or the like, and in this embodiment, the second light guide plate 4 is made of a PC material. The critical angle of total reflection of the second light guide plate 4 is θ 4, and θ 4 is 39.2 °. After the light emitted from 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 ° is totally reflected and propagates inside the second light guide plate 4, and when the incident angle is lower than the critical angle of 39.2 °, the light can be refracted to the outside through the second light emitting surface 401.
The second light guide surface 402 is provided with a second microstructure, the second microstructure has a plurality of second inclined surfaces 4021 arranged, and one end of the second inclined surface 4021 far away from the second light source 5 inclines towards the second light emitting surface 401. The light emitted from the second light source 5 and entering the second light guide plate 4 is totally reflected on the second inclined surface 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 less than or equal to the critical angle θ 4, and then the light is refracted out from the second light emitting surface 401. In addition, the angle between the second inclined surface 4021 and the horizontal plane is θ 7, the time for light to reach the critical angle θ 4 can be adjusted by changing the size of θ 7, and θ 7 is set to be 4 ° in this embodiment.
In this embodiment, the extending direction of the second inclined planes 4021 is the same as the extending direction 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 from the second light source 5 is refracted by the second light incident surface 403 and enters the second light guide plate 4, and totally reflected in the second light guide plate 4 until the second incident angle of the light on the second light emitting surface 401 is smaller than or equal to θ 4, is refracted and emitted from the second light emitting surface 401, and then is refracted by the prism units 302 of the first light guide plate 1 and the prism sheet 3 in sequence, and then is emitted from the prism light emitting surface 301 to form a second light distribution, according to snell's law, the second light distribution is deflected in the direction of the second light source 5, namely, the light is refracted out from the left side of the normal on the prism light-emitting surface 301, and the second light distribution has a second peak with a distribution angle theta 5 not more than-15 degrees, namely, the light intensity is maximum in the angle range of-35 degrees to-15 degrees, with the vertical line perpendicular to the prism light-emitting surface 301 as the reference. The negative value of the second light distribution angle is expressed relative to the first light distribution angle. By adopting the technical scheme, the second light source 5 is lightened through switching of the electric signals, the light emitting angle is concentrated at minus 35 degrees to minus 15 degrees, and the display device can see picture display within minus 35 degrees to minus 15 degrees from the oblique angle on the left side of the vertical line.
Referring to fig. 6, for example, after the light enters the second light guide plate 4 through the second light incident surface 403 at a refraction angle of 24 °, the light reaches the second light guide surface 402 and is totally reflected at a reflection angle of 61 °, and the light is refracted out at the second light emitting surface 401 until the incident angle reaches 34 °, enters the first light guide plate 1, exits from the first light guide plate 1 at a refraction angle of 69 °, is refracted by the prism units 302 of the prism sheet 3, and finally exits from the prism light emitting 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 rays are distributed into the superposition of independently lighting the first light source 2 and independently lighting the second light source 5, and at the moment, the display device can see one picture display from the oblique angle of 15-35 degrees on the right side of the vertical line and can see the other picture display from the oblique angle of-35-15 degrees on the left side of the vertical line.
Referring to fig. 1, the reflective sheet 6 is disposed on the second light guide surface 402, and 3M ESRSeries is used as the reflective sheet 9, but it is needless to say that any medium having a reflective property may be used as the reflective sheet 9.
Referring to fig. 4, a first lens array structure is disposed on the first light emitting surface 101, a second lens array structure is disposed on the second light emitting surface 401, and the first lens array structure and the second lens array structure are both a plurality of arranged cylindrical or conical structures, and the arrangement manner may be continuous or spaced. In this embodiment, the first lens array structure and the second lens array structure both adopt continuously arranged cylindrical structures, the independent cylindrical structures are arranged along the left-right direction, the extending direction of the arrangement of the plurality of cylindrical structures is the front-back direction, and the extending direction of the arrangement of the plurality of cylindrical structures is perpendicular to the extending direction of the arrangement of the prism units 302. The first lens array structure and the second lens array structure can gather light in the front side direction and the rear side direction, and the main purpose is to enable the light to be gathered at the center as much as possible when the lens is used for vehicle-mounted central control, and the influence on the sight caused by the reflection of the light to a windshield can be effectively avoided if the lens is used for vehicle-mounted central control.
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: any product or component with a display function, such as a vehicle-mounted central control screen, a notebook, a mobile phone, a tablet and the like.
Therefore, the backlight module and the dual-view display device are provided with the double-layer light guide plate, namely the first light guide plate and the second light guide plate which are arranged in a superposition way, and the prism lens is arranged on the first light guide plate, so that light emitted by the first light source positioned on the first light incoming surface of the first light guide plate can be refracted by the prism lens, the light outgoing angle is concentrated in a certain angle range, and the display device can see picture display from the oblique 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 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 an oblique angle in the angle range on the left side of the vertical line; one light source or both light sources can be lightened by switching the electric signals according to actual needs, so that the display device can watch pictures at a single oblique viewing angle or different pictures at double oblique viewing angles, the development of the double-view display device is realized, convenience is brought to users, and the double-view display device has a very good application prospect.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms than described herein, and therefore the invention is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A backlight module, comprising:
the light guide plate comprises a first light guide plate (1) and a second light guide plate, wherein the first light guide plate is provided with a first light emitting surface (101), a first light guide surface (102) and a first light incident surface (103) connected between the first light emitting surface (101) and the first light guide surface (102), and a first light source (2) is arranged on the first light incident surface (103);
the prism sheet (3) is arranged on the first light-emitting surface (101) of the first light guide plate (1), the prism sheet (3) is provided with a prism light-emitting surface (301) and a plurality of arrayed prism units (302) opposite to the prism light-emitting surface (301), and the prism units (302) are arranged opposite to the first light-emitting surface (101);
the second light guide plate (4) is provided with a second light emitting surface (401) and a second light guide surface (402) which are opposite to each other, and a second light incident surface (403) connected between the second light emitting surface (401) and the second light guide surface (402), wherein a second light source (5) is arranged on the second light incident surface (403), and the second light emitting surface (401) is just opposite to the first light guide surface (102).
2. A backlight module according to claim 1, wherein: the prism unit (302) 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 theta 1, and theta 1 is 50 DEG-60 deg.
3. A backlight module according to claim 1, wherein: 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 by the first light incident surface (103) and enters the first light guide plate (1), and is totally reflected in the first light guide plate (1) until the first incident angle of the light on the first light emitting surface (101) is smaller than or equal to theta 2, the light is refracted by the first light emitting surface (101) and emitted, the light is refracted by the prism unit (302) of the prism sheet (3) and emitted from the prism light emitting surface (301) to form first light distribution, the first light distribution deflects towards the first light source (2), and the first light distribution has a first peak with the distribution angle of theta 3 being larger than or equal to 15 degrees and smaller than or equal to 35 degrees on the basis of a perpendicular line perpendicular to the prism light emitting surface (301).
4. A backlight module according to claim 1, wherein: the critical angle of the second light guide plate (4) for total reflection is theta 4, 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), and totally reflecting in the second light guide plate (4) until the second incident angle of the light on the second light emitting surface (401) is less than or equal to theta 4, is refracted and emitted by the second light emitting surface (401), and is refracted by the prism units (302) of the first light guide plate (1) and the prism sheet (3) in sequence, a second light distribution is formed by the light emitting surface (301) of the prism, the second light distribution deflects towards the second light source (5), and the second light distribution has a second wave peak with a distribution angle theta 5 not more than-15 degrees and not more than-35 degrees by taking a vertical line vertical to the light-emitting surface (301) of the prism as a reference.
5. A backlight module according to claim 1, wherein: the first light guide surface (102) is provided with a first microstructure, the first microstructure is provided with a plurality of first inclined surfaces (1021) which are arranged, and one end, far away from the first light source (2), of each first inclined surface (1021) inclines towards the first light emitting surface (101).
6. A backlight module according to claim 1, wherein: the second light guide surface (402) is provided with a second microstructure, the second microstructure is provided with a plurality of second inclined surfaces (4021) which are arranged, and one end, far away from the second light source (5), of each second inclined surface (4021) inclines towards the second light emitting surface (401).
7. A backlight module according to claim 1, wherein: the first light source (2) and the second light source (5) are respectively positioned at two opposite side ends of the backlight module.
8. A backlight module according to claim 1, wherein: the light source comprises a first light emitting surface (101), a second light emitting surface (401), a first lens array structure and a second lens array structure, wherein the first light emitting surface is provided with the first lens array structure, the second light emitting surface is provided with the 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 rows.
9. 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).
10. A dual view display device, comprising: a backlight module according to any one of claims 1 to 9.
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 |
|---|---|
| CN113204070A true CN113204070A (en) | 2021-08-03 |
| CN113204070B CN113204070B (en) | 2023-11-03 |
Family
ID=77028065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110439659.7A Active CN113204070B (en) | 2021-04-23 | 2021-04-23 | Backlight module and double-vision display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113204070B (en) |
Citations (4)
| 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 transmission type display apparatus |
| US20120069550A1 (en) * | 2010-09-17 | 2012-03-22 | Au Optronics Corporation | Display Device with Switchable Viewing Angle and Backlight Module Thereof |
| 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 |
-
2021
- 2021-04-23 CN CN202110439659.7A patent/CN113204070B/en active Active
Patent Citations (4)
| 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 transmission type display apparatus |
| US20120069550A1 (en) * | 2010-09-17 | 2012-03-22 | Au Optronics Corporation | Display Device with Switchable Viewing Angle and Backlight Module Thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113204070B (en) | 2023-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5291469B2 (en) | Backlight structure | |
| JP6098064B2 (en) | Display device and lighting device | |
| KR20200141459A (en) | Optical waveguide for directional backlight | |
| US8582055B2 (en) | Backlight device and display apparatus | |
| CN109496258A (en) | Wide-angle image directional backlight | |
| US7855763B2 (en) | Backlight device and transmission type display apparatus | |
| CN108323187A (en) | Wide-angle image directional backlight | |
| CN108431670A (en) | Surface features for being imaged directional backlight | |
| CN108732823B (en) | Backlight system of head-up display device | |
| US9508291B2 (en) | Image display apparatus | |
| CN106461819A (en) | Optical systems having variable viewing angles | |
| US8054554B2 (en) | Display apparatus | |
| CN112889105A (en) | Light filling module, display screen, display device and terminal | |
| JP6921327B2 (en) | HUD lighting system, head-up display device and implementation method | |
| CN101661188A (en) | Liquid crystal display | |
| CN110730926B (en) | Optical structure and display device | |
| US10073207B2 (en) | Display device having liquid crystal layer sealed between sealing member, first substrate, and second substrate | |
| EP3034935A1 (en) | Backlight apparatus and display apparatus having the same | |
| CN111176016A (en) | Backlight module and display device | |
| US11828974B2 (en) | Backlight module and display apparatus | |
| US20010006574A1 (en) | Plane light source unit and liquid-crystal display device | |
| CN214954193U (en) | Double-shaft emergent angle backlight module | |
| CN108463667A (en) | Wide-angle image directional backlight | |
| US8023194B2 (en) | Display apparatus | |
| CN113156570A (en) | Backlight module and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |