CN114236909A - Backlight module, display element and aerial suspension display system - Google Patents
Backlight module, display element and aerial suspension display system Download PDFInfo
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- CN114236909A CN114236909A CN202111582946.XA CN202111582946A CN114236909A CN 114236909 A CN114236909 A CN 114236909A CN 202111582946 A CN202111582946 A CN 202111582946A CN 114236909 A CN114236909 A CN 114236909A
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- 239000000725 suspension Substances 0.000 title claims abstract description 27
- 238000009792 diffusion process Methods 0.000 claims abstract description 38
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 16
- 239000010408 film Substances 0.000 claims description 50
- 230000010287 polarization Effects 0.000 claims description 42
- 239000012788 optical film Substances 0.000 claims description 40
- 238000002834 transmittance Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 4
- 235000009537 plain noodles Nutrition 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 238000003384 imaging method Methods 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000003491 array Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
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- 238000009827 uniform distribution Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
- G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
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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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module, a display element and an air suspension display system, which comprise a diffusion film, a light guide component and a laser light source component, wherein the diffusion film is positioned in the light emergent direction of the light guide component; the laser light source assembly is used for emitting laser beams; the light guide assembly is used for receiving the laser beams emitted by the laser light source assembly and projecting the laser beams to the diffusion film; the diffusion film is used for receiving the laser beams projected by the light guide assembly, diffusing the laser beams to form diffused beams, and then projecting the diffused beams to a light receiving surface of the liquid crystal panel; wherein the light diffusion angle of the diffusion film is 25-35 deg. The invention improves the imaging effect of the suspension display image of the air suspension display system.
Description
Technical Field
The invention relates to the technical field of optical display, in particular to a backlight module, a display element and an air suspension display system.
Background
Floating in the air display, also known as air imaging/aerial imaging, is a technique for projecting an image onto an almost invisible air wall so that a viewer can see an image or a film floating in the air. The air suspension display is used as a novel display mode, and brings more possibilities for creative application in various fields such as living and entertainment. For example, in commercial activities, the floating display can replace the traditional entity advertisement board, and promote the product popularization and the commercial propaganda.
The prior art air suspension display system comprises three parts, namely a display element, a polarization reflection element and a reverse reflection element, wherein the display element is used for emitting linear polarization light; the polarization reflecting element is used for receiving the linearly polarized light emitted by the display element and reflecting the linearly polarized light to the reverse reflecting element; the retroreflective element is used for receiving the linear polarized light reflected by the polarization reflective element and changing the polarization direction of the linear polarized light, then the linear polarized light with the changed polarization direction is reflected according to the original path, so that the linear polarized light with the changed polarization direction is emitted through the polarization reflective element, and finally the linear polarized light is focused on one side of the polarization reflective element far away from the retroreflective element to form a suspended display image.
Since the viewing angle of a typical display device is very wide, for example, the viewing angle of an LCD panel is generally 150 to 170 degrees, and the viewing angle of an oled display panel is generally over 170 degrees. Whereas in an air-floating display system, only a small portion of the light emitted on the display element (typically around 30 degrees) is required for floating the displayed image. Therefore, redundant light can be reflected back and forth for multiple times in the air suspension display system to generate stray light, and the imaging effect of the suspension display image is influenced.
Disclosure of Invention
The invention mainly aims to provide a backlight module, a display element and an aerial suspension display system, and aims to improve the imaging effect of a suspension display image of the aerial suspension display system.
In order to achieve the above object, the present invention provides a backlight module, which comprises a diffusion film, a light guide assembly and a laser light source assembly, wherein the diffusion film is located in the light emitting direction of the light guide assembly; the laser light source assembly is used for emitting laser beams; the light guide assembly is used for receiving the laser beams emitted by the laser light source assembly and projecting the laser beams to the diffusion film; the diffusion film is used for receiving the laser beams projected by the light guide assembly, diffusing the laser beams to form diffused beams, and then projecting the diffused beams to a light receiving surface of the liquid crystal panel; wherein the light diffusion angle of the diffusion film is 25-35 deg.
Preferably, the laser light source assembly comprises a first laser light source assembly and a second laser light source assembly, and the first laser light source assembly and the second laser light source assembly are respectively arranged at two opposite sides of the light guide assembly; the first laser light source assembly comprises a plurality of first laser alignment modules arranged in a linear array, and the second laser light source assembly comprises a plurality of second laser alignment modules arranged in a linear array, wherein N is a positive integer; the second laser collimation module is aligned with a gap between the adjacent first laser collimation modules.
Preferably, the first laser collimation module and the second laser collimation module have the same structure and respectively comprise a light source generating assembly, a color splitting assembly and a collimation assembly; the light source generating assembly comprises a red laser light source, a green laser light source and a blue laser light source which are sequentially arranged in a linear array, and the red laser light source is positioned on one side close to the collimation assembly; the color splitting assembly comprises a first color splitting element, a second color splitting element and a third color splitting element which are sequentially arranged in a linear array, wherein the first color splitting element is obliquely arranged at the light outlet end of the red laser light source so as to guide red laser emitted by the red laser light source to be reflected to the collimation assembly; the second color light splitting element is obliquely arranged at the light emitting end of the green laser light source so as to guide the green laser light emitted by the green laser light source to be reflected to the collimation assembly; the third color light splitting element is obliquely arranged at the light outlet end of the blue laser light source so as to guide the blue laser light emitted by the blue laser light source to be reflected to the collimation assembly.
Preferably, the collimating assembly comprises a polarizing beam splitting element, a concave mirror and a parabolic mirror; the concave reflector is positioned in the reflection direction of the S polarized light beam of the polarization light splitting element, and a quarter phase delay film is arranged on the concave reflecting surface of the concave reflector; the parabolic mirror is located in the transmission direction of the P polarized light beam of the polarization beam splitting element.
Preferably, the light guide assembly includes a light guide plate, the light guide plate includes a light incident surface, a reflecting surface and a light exiting surface, the light incident surface is used for receiving the laser beam emitted by the laser light source assembly, the reflecting surface is used for reflecting the laser beam incident into the light guide plate to the light exiting surface, and the light exiting surface is aligned with the light receiving surface of the diffusion film; the light guide plate comprises a light incident surface and a light emergent surface, and is characterized in that an antireflection film is arranged on the light incident surface, a reflection film is arranged on the reflection surface, an optical film and a first light deflection element are sequentially arranged on the light emergent surface, and the first light deflection element is positioned on one side, far away from the light guide plate, of the optical film.
Preferably, when the laser beam emitted by the laser light source assembly is inclined to the Z axis and enters the light guide plate, an included angle between the light incident surface and the reflecting surface is a first included angle β; when the laser beam that laser light source subassembly launched is on a parallel with or perpendicular to Z axle jets into the light guide plate, still be provided with second light deflection element on the income plain noodles, second light deflection element be used for with laser beam jets into extremely during the light guide plate, make the contained angle between laser beam and the Z axle be second contained angle alpha, wherein, second contained angle alpha equals first contained angle beta.
Preferably, the beam aperture of the laser beam emitted by the laser light source assembly is defined as W0, the interval between two adjacent laser beams emitted from the light emitting surface is defined as W2, and the thickness of the light guide plate is defined as h; when the laser beam emitted from the light guide plate is continuous and uninterrupted, namely W2 is less than or equal to 0, W0 and h satisfy the relation:
preferably, the optical film comprises a plurality of optical film sub-regions distributed in a linear array along the light-emitting surface, and the transmittance of the optical film sub-regions close to the light-entering surface is smaller than that of the optical film sub-regions far away from the light-entering surface;
wherein the transmittance of each of the subregions of the optical film satisfies the following relationship:
wherein E ismThe light energy emitted by the mth optical film subarea;
t1,t2,……tmthe transmittance of the optical film sub-area S1 … … Sm.
In order to achieve the above object, the present invention further provides a display device, which includes a liquid crystal panel and the backlight module, wherein a light emitting surface of the backlight module is aligned with a light receiving surface of the liquid crystal panel.
In order to achieve the above object, the present invention provides an air suspension display system, which includes a polarization reflective element, a retroreflective element and the above display element, wherein a third included angle γ is formed between the display element and the polarization reflective element, and the retroreflective element is located in an extension region of the third included angle γ.
Compared with the prior art, the invention has the beneficial effects that:
the backlight module is formed by combining the diffusion film, the light guide assembly and the laser light source assembly, and the diffusion film is used for controlling the diffusion angle of light to be 25-35 degrees, so that the visual angle of the display element is only about 30 degrees, the requirement that only about 30 degrees of light is utilized in the air suspension display system is met, the redundant light is prevented from being reflected back and reflected for many times in the air suspension display system to generate stray light, and the imaging effect of the suspension display image is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a backlight module according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a first laser alignment module in a second embodiment of a backlight module according to the present invention;
FIG. 4 is a schematic view of a collimating assembly in a second embodiment of the backlight module of the present invention;
FIG. 5 is a first schematic view of a light guide plate according to a third embodiment of the backlight module of the present invention;
FIG. 6 is a second schematic view of a light guide plate according to a third embodiment of the backlight module of the present invention;
FIG. 7 is a third embodiment of a light guide plate according to the present invention;
FIG. 8 is a schematic view of an optical film in a third embodiment of a backlight module according to the invention;
FIG. 9 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a display device according to the present invention;
FIG. 11 is a schematic structural diagram of an airborne display system of the present invention;
the names of the components identified in the figures are as follows:
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the background art, the viewing angle of a typical display element is very wide, for example, the viewing angle of an LCD display screen is generally 150 to 170 degrees, and the viewing angle of an oled display screen is generally over 170 degrees. Whereas in an air-floating display system, only a small portion of the light emitted on the display element (typically around 30 degrees) is required for floating the displayed image. Therefore, the redundant light can be reflected back and forth for many times in the air suspension display system to generate stray light, and the imaging effect of the suspension display image is influenced.
In order to solve the above technical problem, the first embodiment discloses a backlight module, as shown in fig. 1, including a diffusion film 1, a light guide assembly 2 and a laser light source assembly 3, where the diffusion film 1 is located in a light emitting direction of the light guide assembly 2; the laser light source component 3 is used for emitting laser beams; the light guide assembly 2 is used for receiving the laser beam emitted by the laser light source assembly 3 and projecting the laser beam to the diffusion film 1; the diffusion film 1 is used for receiving the laser beam projected by the light guide assembly 2, diffusing the laser beam to form a diffused light beam, and then projecting the diffused light beam to the light receiving surface of the liquid crystal panel 20; wherein, the light diffusion angle of the diffusion film 1 is 25-35 deg.
In the first embodiment, the diffusion film 1, the light guide assembly 2 and the laser light source assembly 3 are combined to form the backlight module 21, the diffusion film 1 is used to control the diffusion angle of light to be 25-35 degrees, and then the viewing angle of the display element 24 is only about 30 degrees, so that the requirement that only about 30 degrees of light is utilized in the aerial suspension display system is met, the redundant light is prevented from being reflected back and emitting to generate stray light for multiple times in the aerial suspension display system, and the imaging effect of the suspension display image is improved.
Specifically, the diffusion film 1 may be a diffusion film, such as a 30-degree diffusion film, to realize that the outgoing light beam of the liquid crystal panel 20 is emitted at a small angle (30 degrees). Meanwhile, in general, in order to increase the uniformity of the emergent light beam, a plurality of small-angle diffuser films can be used for superposition to form a required diffuser film, for example, 3 layers of 10-degree diffuser films can be used for superposition to achieve the angle diffusion effect of a 30-degree diffuser film.
On the basis of the first embodiment, the present invention proposes a second embodiment.
Referring to fig. 2-4, the second embodiment discloses that the laser light source assembly 3 includes a first laser light source assembly 4 and a second laser light source assembly 5, and the first laser light source assembly 4 and the second laser light source assembly 5 are respectively disposed at two opposite sides of the light guide assembly 2; the first laser light source assembly 4 comprises a plurality of linear arrays of N first laser alignment modules 401, and the second laser light source assembly 5 comprises a plurality of linear arrays of N-1 second laser alignment modules 501, wherein N is a positive integer; the second laser alignment module 501 aligns the gap between adjacent first laser alignment modules 401. So set up, consider because laser light source subassembly 3 is formed by the laser collimation module combination that a plurality of linear array arranged, because the mechanical structure of laser collimation module (like installation shell), certain interval has between the nearly collimated light beam that adjacent laser collimation module was emergent for there is banded distribution in the light beam energy who goes out from leaded light subassembly 2, and consequently reduce the homogeneity of light beam energy distribution, lead to the suspension display image definition that aerial suspension display system finally formed not high. Therefore, the present embodiment includes the laser source assembly 3 including the first laser source assembly 4 and the second laser source assembly 5, and disposed on two opposite sides of the light guide assembly 2. Therefore, the gap between the adjacent first laser collimation modules 401 on the same side can be compensated by the second laser collimation module 501 on the other side, so that the laser beams emitted from the light guide assembly 2 are uniformly distributed and cannot be in strip distribution.
Further, as shown in fig. 3, the first laser collimation module 401 and the second laser collimation module 501 have the same structure, and both include a light source generating assembly 6, a color splitting assembly 7, and a collimation assembly 8; the light source generating assembly 6 comprises a red laser light source 601, a green laser light source 602 and a blue laser light source 603 which are sequentially arranged in a linear array, and the red laser light source 601 is positioned at one side close to the collimation assembly 8; the color separation assembly 7 includes a first color separation element 701, a second color separation element 702 and a third color separation element 703 sequentially arranged in a linear array, wherein the first color separation element 701 is obliquely arranged at the light emitting end of the red laser source 601 to guide the red laser emitted by the red laser source 601 to be reflected to the collimation assembly 8 and to be transmitted to the green laser source 602 and the blue laser source 603; the second dichroic beam splitter 702 is obliquely disposed at the light emitting end of the green laser source 602 to guide the green laser emitted from the green laser source 602 to be reflected to the collimating assembly 8 and to transmit to the blue laser source 603; the third color splitter 703 is obliquely disposed at the light-emitting end of the blue laser source 603 to guide the blue laser emitted from the blue laser source 603 to be reflected to the collimator assembly 8. So set up, utilize light source to generate subassembly 6 and colour beam split subassembly 7 and cooperate and produce RBG laser beam combination, reuse collimation subassembly 8 to make an alignment to RBG laser beam combination in order to form near collimated light beam, wherein, the alignment leads to saying that just keeps being parallel between the light.
Further, as shown in fig. 4, the collimating assembly 8 includes a polarization beam splitting element 801, a concave mirror 802, and a parabolic mirror 803; the concave mirror 802 is located in the reflection direction of the S-polarized light beam of the polarization beam splitter 801, and a quarter-phase delay film (also called quarter-wave plate) is disposed on the concave reflection surface 902 of the concave mirror 802; the parabolic mirror 803 is located in the transmission direction of the P-polarized light beam of the polarization beam splitter 801. With this arrangement, one polarized light beam (e.g., S polarized light beam) of the RBG laser beam combination transmitted from the color separation element 7 is reflected by the polarization separation element 801 to the concave reflecting mirror 802, the concave reflecting surface 902 of the concave reflecting mirror 802 has a quarter-phase retardation film, the S polarized light beam is converted into one circularly polarized light beam by the quarter-phase retardation film, the circularly polarized light beam is collimated and reflected by the concave surface of the concave reflecting mirror 802, the reflected circularly polarized light beam is converted into another polarized light beam (e.g., P polarized light beam) by the quarter-phase retardation film, and the P polarized light beam is emitted through the polarization separation element 801; the other polarized light beam (P polarized light beam) of the RBG laser beam combination transmitted from the color separation element 7 transmits through the polarization beam splitter 801, continues to be transmitted to the parabolic mirror 803, is collimated, and is reflected and emitted. The P-polarized light beam reflected by the parabolic mirror 803 is parallel to the P-polarized light beam polarized by the concave mirror 802 and then projected by the polarization beam splitter 801. The laser beams emitted from the two parts have the same polarization state, so that the energy of the beams finally emitted from the liquid crystal panel 20 is close to the energy of the emitted light of the laser light source assembly 3, and the utilization rate of light energy is improved. The emergent light energy of the laser light source assembly 3 has the same polarization state after the technical means is adopted, and because the liquid crystal panel 20 is provided with two layers of polarization films, the loss such as absorption is not delayed, the emergent light energy of the laser light source assembly 3 converted into the polarization state can all pass through the first layer of polarization film of the liquid crystal panel 20, the light passing through the first layer is modulated by the liquid crystal and then converted into the second polarized light, and the second layer of polarization film can also pass through, so that the utilization rate of the light energy is improved. Without prior conversion to the polarization state, about 50% would not pass through when passing through the first polarizing film of the liquid crystal panel 20 (i.e., for example, the P-polarized beam would pass through and the S-polarized beam would not pass through), resulting in loss of light energy. Meanwhile, the light beam caliber of a single laser collimation module is enlarged by arranging the parabolic reflector 803, fewer laser collimation modules can be used, the assembly complexity of the backlight module is reduced, and the economic benefit of an enterprise is improved.
On the basis of the first embodiment, the present invention proposes a third embodiment.
Referring to fig. 5-8, the third embodiment discloses that the light guide assembly 2 includes a light guide plate 9, the light guide plate 9 includes a light incident surface 910, a reflecting surface 902 and a light emitting surface 903, the light incident surface 910 is configured to receive a laser beam emitted by the laser light source assembly 3, the reflecting surface 902 is configured to reflect the laser beam incident on the light guide plate 9 to the light emitting surface 903, and the light emitting surface 903 is aligned with a light receiving surface of the diffusion film 1; the light incident surface 910 is provided with an antireflection film 10, the reflection surface 902 is provided with a reflection film 11, the light exit surface 903 is provided with an optical film 12 and a first light deflection element 13 in sequence, and the first light deflection element 13 is positioned on one side of the optical film 12 far away from the light guide plate 9. In this arrangement, the first optical deflection element 13 is a diffraction element that deflects incident light by a certain angle, and may be glued to the light exit surface 903 of the light guide plate 9. The near-collimated light beam output from the laser light source unit 3 enters from the light incident surface 910 of the light guide plate 9, is totally reflected on the reflection surface 902 of the light guide plate 9, is refracted and emitted on the light emitting surface 903 of the light guide plate 9, and is deflected by the first light deflecting element 13 and emitted in a direction perpendicular to the light emitting surface 903 of the light guide plate 9.
Preferably, as shown in fig. 5, when the laser beam emitted by the laser source assembly 3 is inclined to the Z axis and enters the light guide plate 9, an included angle between the light incident surface 910 and the reflecting surface 902 is a first included angle β; as shown in fig. 6 and 7, when the laser beam emitted by the laser source assembly 3 is incident on the light guide plate 9 in parallel or perpendicular to the Z axis, the light incident surface 910 is further provided with a second light deflecting element 14, and when the second light deflecting element 14 is used for emitting the laser beam to the light guide plate 9, an included angle between the laser beam and the Z axis is a second included angle α, where the second included angle α is equal to the first included angle β. So set up, according to the position that laser light source subassembly 3 set up for leaded light subassembly 2 to carry out corresponding improvement, improve the suitability. The second included angle α is equal to the first included angle β to ensure that the transmission line of the laser beam in the light guide plate is always the same regardless of where the laser light source assembly 3 is disposed.
Preferably, the beam diameter of the laser beam emitted by the laser light source assembly 3 is defined as W0, the interval between two adjacent laser beams emitted from the light emitting surface 903 is defined as W2, and the thickness of the light guide plate 9 is defined as h; when the laser beams emitted from the light guide plate 9 are continuous, i.e. the laser beams emitted from the light emitting surface 903 at two adjacent times overlap, i.e. W2 is less than or equal to 0, W0 and h satisfy the following relation:
so set up, can guarantee from the laser beam of light guide plate 9 outgoing for continuous incessant to improve the formation of image effect of aerial suspension display image.
Preferably, as shown in fig. 8, the optical film 12 includes a plurality of optical film sub-regions S1 … … Sm distributed in a linear array along the light exiting surface 903, and the transmittance of the optical film sub-region close to the light entering surface 901 is smaller than that of the optical film sub-region far from the light entering surface 901;
wherein the transmittance of each optical film subregion satisfies the following relationship:
wherein E ismThe light energy emitted by the mth optical film subarea;
t1,t2,……tmthe transmittance of the optical film sub-area S1 … … Sm.
In this arrangement, the optical film 12 is arranged to have a gradually changing transmittance so as to achieve uniform distribution of light energy of the laser beam emitted from the light guide plate 9, in consideration of damage to a part of the light energy when the laser beam is reflected by the light guide plate 9. In this way, the energy of the laser beam decreases in the light guide plate 9 from the light incident surface 901, but the transmittance of the optical film 12 increases in the light incident surface 901, so that the two values cancel each other out, and the light energy of the laser beam emitted from the light guide plate is approximately uniform.
The present invention proposes a fourth embodiment in combination with the second embodiment and the third embodiment on the basis of the first embodiment.
Referring to fig. 9, in the fourth embodiment, the laser light source assembly 3 includes a first laser light source assembly 4 and a second laser light source assembly 5, and the first laser light source assembly 4 and the second laser light source assembly 5 are respectively disposed at two opposite sides of the light guide assembly 2; the first laser light source assembly 4 comprises a plurality of linear arrays of N first laser alignment modules 401, and the second laser light source assembly 5 comprises a plurality of linear arrays of N-1 second laser alignment modules 501, wherein N is a positive integer; the second laser alignment module 501 aligns with a gap between adjacent first laser alignment modules 401; the light guide assembly 2 includes a light guide plate 9, the light guide plate 9 includes a light incident surface 910, a reflecting surface 902 and a light emitting surface 903, the light incident surface 910 is configured to receive the laser beam emitted by the laser light source assembly 3, the reflecting surface 902 is configured to reflect the laser beam incident on the light guide plate 9 to the light emitting surface 903, and the light emitting surface 903 is aligned with the light receiving surface of the diffusion film 1; the light incident surface 910 is provided with an antireflection film 10, the reflection surface 902 is provided with a reflection film 11, the light exit surface 903 is provided with an optical film 12 and a first light deflection element 13 in sequence, and the first light deflection element 13 is positioned on one side of the optical film 12 far away from the light guide plate 9.
The first laser collimation module 401 and the second laser collimation module 501 have the same structure and respectively comprise a light source generation assembly 6, a color splitting assembly 7 and a collimation assembly 8; the light source generating assembly 6 comprises a red laser light source 601, a green laser light source 602 and a blue laser light source 603 which are sequentially arranged in a linear array, and the red laser light source 601 is positioned at one side close to the collimation assembly 8; the color separation assembly 7 includes a first color separation element 701, a second color separation element 702 and a third color separation element 703 sequentially arranged in a linear array, wherein the first color separation element 701 is obliquely arranged at the light emitting end of the red laser source 601 to guide the red laser emitted by the red laser source 601 to be reflected to the collimation assembly 8 and to be transmitted to the green laser source 602 and the blue laser source 603; the second dichroic beam splitter 702 is obliquely disposed at the light emitting end of the green laser source 602 to guide the green laser emitted from the green laser source 602 to be reflected to the collimating assembly 8 and to transmit to the blue laser source 603; the third color splitter 703 is obliquely disposed at the light-emitting end of the blue laser source 603 to guide the blue laser emitted from the blue laser source 603 to be reflected to the collimator assembly 8.
The collimating assembly 8 includes a polarization beam splitter 801, a concave reflector 802, and a parabolic reflector 803; the concave mirror 802 is located in the reflection direction of the S-polarized light beam of the polarization beam splitter 801, and a quarter-phase delay film (also called quarter-wave plate) is disposed on the concave reflection surface 902 of the concave mirror 802; the parabolic mirror 803 is located in the projection direction of the P-polarized light beam by the polarization beam splitter 801.
When the laser beam emitted by the laser light source assembly 3 is parallel to or perpendicular to the Z axis and enters the light guide plate 9, the second light deflecting element 14 is further disposed on the light incident surface 910, and when the second light deflecting element 14 is used for entering the laser beam into the light guide plate 9, the included angle between the laser beam and the Z axis is a second included angle α.
Wherein, the beam aperture of the laser beam emitted by the laser light source assembly 3 is defined as W0, the interval between two adjacent laser beams emitted from the light emitting surface 903 is defined as W2, and the thickness of the light guide plate 9 is defined as h; when the laser beam emitted from the light guide plate 9 is continuous, i.e. when W2 is less than or equal to 0, W0 and h satisfy the relation:
the optical film 12 includes a plurality of optical film sub-regions linearly distributed along the light exit surface 903, and since the left and right sides of the light guide plate 9 are both the light entrance surface 901 at this time, the transmittance of the optical film sub-regions is correspondingly set to be axisymmetric with the middle position of the light guide plate 9, and the transmittance of the optical film sub-region close to the light entrance surface 901 is smaller than that of the optical film sub-region far from the light entrance surface 901;
wherein the transmittance of each optical film subregion satisfies the following relationship:
wherein E ismThe light energy emitted by the mth optical film subarea;
t1,t2,……tmthe transmittance of the optical film sub-area S1 … … Sm.
With this arrangement, the fourth embodiment is obtained by combining the advantages of the second embodiment and the third embodiment with the first embodiment, so as to further improve the imaging effect of the floating display image of the floating display system.
Referring to fig. 10, the display device of the present invention further includes a liquid crystal panel 20 and the backlight module 21, wherein a light emitting surface of the backlight module 21 is aligned with a light receiving surface of the liquid crystal panel 20.
The invention provides an air suspension display system, referring to fig. 11, comprising a polarized reflective element 22, a retroreflective element 23 and the above-mentioned display element 24, wherein the display element 24 and the polarized reflective element 22 form a third included angle γ, and the retroreflective element 23 is located in an extension region of the third included angle γ.
Wherein the display element 24 is for emitting linearly polarized light; the polarization reflective element 22 is used for receiving the linear polarization light AB emitted by the display element 24 and reflecting the linear polarization light onto the reverse reflective element 23; the retroreflective element 23 is configured to receive the linearly polarized light reflected by the polarization reflective element 22 and change the polarization direction of the linearly polarized light, and then reflect the linearly polarized light with the changed polarization direction in the original path, so that the linearly polarized light with the changed polarization direction is emitted through the polarization reflective element 22, and is finally focused on the side of the polarization reflective element 22 away from the retroreflective element 23 to form a floating display image a 'B'.
It should be noted that other contents of the backlight module, the display element and the floating display system disclosed in the present invention are prior art and are not described herein again.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
Furthermore, it should be noted that the descriptions relating to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The above are only alternative embodiments of the present invention, and not intended to limit the scope of the present invention, and all the applications of the present invention in other related fields are included in the scope of the present invention.
Claims (10)
1. A backlight module is characterized in that: the LED lamp comprises a diffusion film, a light guide assembly and a laser light source assembly, wherein the diffusion film is positioned in the light emergent direction of the light guide assembly; the laser light source assembly is used for emitting laser beams; the light guide assembly is used for receiving the laser beams emitted by the laser light source assembly and projecting the laser beams to the diffusion film; the diffusion film is used for receiving the laser beams projected by the light guide assembly, diffusing the laser beams to form diffused beams, and then projecting the diffused beams to a light receiving surface of the liquid crystal panel; wherein the light diffusion angle of the diffusion film is 25-35 deg.
2. A backlight module according to claim 1, wherein: the laser light source assembly comprises a first laser light source assembly and a second laser light source assembly, and the first laser light source assembly and the second laser light source assembly are respectively arranged on two opposite sides of the light guide assembly; the first laser light source assembly comprises a plurality of first laser alignment modules arranged in a linear array, and the second laser light source assembly comprises a plurality of second laser alignment modules arranged in a linear array, wherein N is a positive integer; the second laser collimation module is aligned with a gap between the adjacent first laser collimation modules.
3. A backlight module according to claim 2, wherein: the first laser collimation module and the second laser collimation module have the same structure and respectively comprise a light source generating assembly, a color splitting assembly and a collimation assembly;
the light source generating assembly comprises a red laser light source, a green laser light source and a blue laser light source which are sequentially arranged in a linear array, and the red laser light source is positioned on one side close to the collimation assembly; the color splitting assembly comprises a first color splitting element, a second color splitting element and a third color splitting element which are sequentially arranged in a linear array, wherein the first color splitting element is obliquely arranged at the light outlet end of the red laser light source so as to guide red laser emitted by the red laser light source to be reflected to the collimation assembly; the second color light splitting element is obliquely arranged at the light emitting end of the green laser light source so as to guide the green laser light emitted by the green laser light source to be reflected to the collimation assembly; the third color light splitting element is obliquely arranged at the light outlet end of the blue laser light source so as to guide the blue laser light emitted by the blue laser light source to be reflected to the collimation assembly.
4. A backlight module according to claim 3, wherein: the collimation assembly comprises a polarization beam splitting element, a concave reflector and a parabolic reflector; the concave reflector is positioned in the reflection direction of the S polarized light beam of the polarization light splitting element, and a quarter phase delay film is arranged on the concave reflecting surface of the concave reflector; the parabolic mirror is located in the transmission direction of the P polarized light beam of the polarization beam splitting element.
5. A backlight module according to claim 1, wherein: the light guide assembly comprises a light guide plate, the light guide plate comprises a light incident surface, a reflecting surface and a light emergent surface, the light incident surface is used for receiving the laser beams emitted by the laser light source assembly, the reflecting surface is used for reflecting the laser beams incident into the light guide plate to the light emergent surface, and the light emergent surface is aligned with the light receiving surface of the diffusion film; the light guide plate comprises a light incident surface and a light emergent surface, and is characterized in that an antireflection film is arranged on the light incident surface, a reflection film is arranged on the reflection surface, an optical film and a first light deflection element are sequentially arranged on the light emergent surface, and the first light deflection element is positioned on one side, far away from the light guide plate, of the optical film.
6. A backlight module according to claim 5, wherein:
when the laser beam emitted by the laser light source component inclines to the Z axis and enters the light guide plate, the included angle between the light incident surface and the reflecting surface is a first included angle beta;
when the laser beam that laser light source subassembly launched is on a parallel with or perpendicular to Z axle jets into during the light guide plate, still be provided with second light deflection element on the income plain noodles, second light deflection element be used for with laser beam jets into extremely during the light guide plate, make the contained angle between laser beam and the Z axle be second contained angle alpha, wherein, second contained angle alpha equals first contained angle beta.
7. A backlight module according to claim 6, wherein: defining the beam aperture of the laser beam emitted by the laser light source component to be W0, the interval between the laser beams emitted from the light emitting surface twice in the adjacent time to be W2, and the thickness of the light guide plate to be h;
when the laser beam emitted from the light guide plate is continuous and uninterrupted, namely W2 is less than or equal to 0, W0 and h satisfy the relation:
8. a backlight module according to claim 5, wherein:
the optical film comprises a plurality of optical film subregions which are distributed along the straight line array of the light-emitting surface, and the transmittance of the optical film subregions close to the light-in surface is smaller than that of the optical film subregions far away from the light-in surface;
wherein the transmittance of each of the subregions of the optical film satisfies the following relationship:
wherein E ismThe light energy emitted by the mth optical film subarea;
t1,t2,……tmthe transmittance of the optical film sub-area S1 … … Sm.
9. A display element characterized by: comprising a liquid crystal panel and a backlight module as claimed in any one of claims 1 to 8, a light exit surface of the backlight module being aligned with a light receiving surface of the liquid crystal panel.
10. An air suspension display system, characterized in that: comprising polarizing reflective elements, retroreflective elements and a display element according to claim 9, the display element and the polarizing reflective elements forming a third angle γ therebetween, the retroreflective elements being located in the extension of the third angle γ.
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