CN114640837A - Naked eye 3D display device - Google Patents

Naked eye 3D display device Download PDF

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Publication number
CN114640837A
CN114640837A CN202011477415.XA CN202011477415A CN114640837A CN 114640837 A CN114640837 A CN 114640837A CN 202011477415 A CN202011477415 A CN 202011477415A CN 114640837 A CN114640837 A CN 114640837A
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China
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grating
light
liquid crystal
crystal display
guide plate
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CN202011477415.XA
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CN114640837B (en
Inventor
田依杉
薛高磊
凌秋雨
孟宪芹
王维
郭宇娇
彭玮婷
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • 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
    • G02B30/26—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 autostereoscopic type
    • G02B30/30—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 autostereoscopic type involving parallax barriers
    • G02B30/31—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 autostereoscopic type involving parallax barriers involving active parallax barriers
    • 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
    • G02B30/26—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 autostereoscopic type
    • G02B30/33—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 autostereoscopic type involving directional light or back-light sources
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/356—Image reproducers having separate monoscopic and stereoscopic modes
    • H04N13/359—Switching between monoscopic and stereoscopic modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/366—Image reproducers using viewer tracking

Abstract

The invention discloses a naked eye 3D display device, which acquires the focusing positions of pupils of both eyes of a viewer and the information of the pointing positions of fingers of the viewer through a pupil tracking and gesture recognition system, judges whether the viewer needs the image information of a 3D full view display mode or the image information of a 3D local view display mode, and sends control signals to the raster regulating and controlling system and the display signal controlling system according to the image information required by the viewer, then the grating regulating and controlling system controls the working states of the first grating and the second grating according to the received control signal, and the display signal control system loads image data during 3D full-view display or loads image data during 3D partial-view display to the liquid crystal display screen according to the received control signal, so that switchable display of full-view naked-eye 3D display and partial-view naked-eye 3D display is realized.

Description

Naked eye 3D display device
Technical Field
The invention relates to the technical field of display, in particular to a naked eye 3D display device.
Background
The naked-eye 3D display can view a 3D image without a viewer wearing any viewing aid such as glasses or a helmet, and thus becomes a mainstream development of the future 3D display. Among them, the autostereoscopic 3D display technology has been considered as a naked eye 3D display technology that is most likely to be commercially popularized due to its ability to obtain dynamic, color, and large-field-angle three-dimensional display effects. The free three-dimensional (3D) display technology comprises a cylindrical lens array technology, a parallax barrier technology, a micro lens array integrated imaging technology and the like, wherein the 2D display screen and an optical element are adopted, the 2D display screen is divided in a specific mode and is used for displaying 2D images of different viewing angles, and then the 2D images are converted into 3D images seen by human eyes through a specific optical principle. The common defect of the display mode is that the angular resolution and the spatial resolution of the 3D image seen by human eyes are mutually restricted for the same 2D display screen. The result is that when the viewer sees a good stereoscopic effect, the perceived image is blurred (the pixel resolution PPI is low), and when the pixel resolution PPI of the image is increased, the stereoscopic effect of the 3D display is poor. The 2D display screen using higher PPI is an effective method to solve this problem, but due to the processing technology, the 2D display screen with higher PPI is currently difficult to obtain.
Therefore, how to realize 3D full view display with better stereoscopic effect and clearer 3D detail view display is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a naked eye 3D display device, so as to achieve a better stereoscopic effect of 3D full view display and a clearer 3D detail view display.
Therefore, an embodiment of the present invention provides a naked eye 3D display device, including:
a liquid crystal display configured to display a left-eye image and a right-eye image;
a collimated backlight configured to provide a light source to the liquid crystal display panel;
a first grating configured as a phase-type grating having a periodic variation of a refractive index in a 3D full view display mode; the first grating is configured as transparent glass in a 3D partial view display mode and a 2D display mode;
a second grating configured as a phase-type grating having a periodic variation of refractive index in a 3D partial view display mode; the second grating is configured as transparent glass in a 3D full-view display mode and a 2D display mode;
the pupil tracking and gesture recognition system is configured to determine that image information required by a viewer is 3D full-view display or 3D partial-view display according to the focusing positions of pupils of two eyes of the viewer and the finger pointing position of the viewer, and send a control signal according to the image information required by the viewer;
the grating regulating system is respectively connected with the first grating and the second grating and is configured to control the working states of the first grating and the second grating according to the control signal sent by the pupil tracking and gesture recognition system;
and the display signal control system is connected with the liquid crystal display screen and is configured to load image data during 3D full-view display or image data during 3D partial-view display to the liquid crystal display screen according to the control signal sent by the pupil tracking and gesture recognition system.
Optionally, in specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, the liquid crystal display has a plurality of display pixels distributed in an array, the first grating has a plurality of first grating pixels in one-to-one correspondence with the display pixels, and the second grating has a plurality of second grating pixels in one-to-one correspondence with the display pixels;
the first grating is divided into a plurality of first grating units, the number of first grating pixels in each first grating unit is the same, when the 3D full-view display mode is adopted, grating periods corresponding to the first grating pixels in the same first grating unit are different, and grating periods corresponding to the first grating pixels at the same positions in different first grating units are the same;
the second grating is divided into a plurality of second grating units, the number of the second grating units is smaller than that of the first grating units, the number of second grating pixels in each second grating unit is the same, and in a 3D local view display mode, grating periods corresponding to the second grating pixels in the same second grating unit are the same, and grating periods corresponding to the second grating pixels in different second grating units are different.
Optionally, in a specific implementation, in the naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is of a side-in type, the collimated backlight includes a collimated light and a light guide plate, and the light guide plate has a bottom surface and a light-emitting surface that are oppositely disposed, and a light-in surface that connects the bottom surface and the light-emitting surface;
collimated light is located income plain noodles one side of light guide plate, first grating is located go out plain noodles one side of light guide plate, the second grating is located first grating deviates from one side of light guide plate, liquid crystal display is located the second grating deviates from one side of light guide plate.
Optionally, in a specific implementation, in the naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is of a side-in type, the collimated backlight includes a collimated light and a light guide plate, and the light guide plate has a bottom surface and a light-emitting surface that are oppositely disposed, and a light-in surface that connects the bottom surface and the light-emitting surface;
collimated light is located income plain noodles one side of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located liquid crystal display deviates from one side of light guide plate, the second grating is located first grating with between the liquid crystal display.
Optionally, in a specific implementation, in the naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is of a side-in type, the collimated backlight includes a collimated light and a light guide plate, and the light guide plate has a bottom surface and a light-emitting surface that are oppositely disposed, and a light-in surface that connects the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located play plain noodles of light guide plate with between the liquid crystal display.
Optionally, in a specific implementation, in the naked eye 3D display device provided in the embodiment of the present invention, the collimated backlight is of a side-in type, the collimated backlight includes a collimated light and a light guide plate, and the light guide plate has a bottom surface and a light-emitting surface that are arranged oppositely, and a light-in surface connecting the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located liquid crystal display deviates from one side of light guide plate.
Optionally, in a specific implementation, in the naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is of a side-in type, the collimated backlight includes a collimated light and a light guide plate, and the light guide plate has a bottom surface and a light-emitting surface that are oppositely disposed, and a light-in surface that connects the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located first grating deviates from one side of light guide plate.
Optionally, in specific implementation, in the above naked eye 3D display device provided in the embodiment of the present invention, the collimated backlight is a direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display, the naked eye 3D display device further includes a grating substrate, the first grating is located between the grating substrate and the liquid crystal display, and the second grating is located between the first grating and the liquid crystal display.
Optionally, in specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is a direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the liquid crystal display screen away from the collimated backlight, and the second grating is located between the first grating and the liquid crystal display screen.
Optionally, in a specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is a direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, which is away from the liquid crystal display screen, and the second grating is located between the collimated backlight and the liquid crystal display screen.
Optionally, in a specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is a direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, which is away from the liquid crystal display screen, and the second grating is located on one side of the liquid crystal display screen, which is away from the collimated backlight.
Optionally, in specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, the collimated backlight is a direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, which is away from the liquid crystal display screen, and the second grating is located on one side of the first grating, which is away from the liquid crystal display screen.
The embodiment of the invention has the following beneficial effects:
the naked eye 3D display device provided by the embodiment of the invention acquires the focusing positions of pupils of both eyes of a viewer and the information of the pointing positions of fingers of the viewer through a pupil tracking and gesture recognition system, judges whether the viewer needs the image information of a 3D full view display mode or the image information of a 3D local view display mode, and sends control signals to the raster regulating and controlling system and the display signal controlling system according to the image information required by the viewer, then the grating regulating and controlling system controls the working states of the first grating and the second grating according to the received control signal, and the display signal control system loads image data during 3D full-view display or loads image data during 3D partial-view display to the liquid crystal display screen according to the received control signal, so that switchable display of full-view naked-eye 3D display and partial-view naked-eye 3D display is realized.
Drawings
Fig. 1 is a schematic structural diagram of a naked-eye 3D display device according to an embodiment of the present invention;
fig. 2 to fig. 11 are schematic structural diagrams of the naked-eye 3D display device according to the embodiment of the present invention;
FIG. 12A is a schematic view of a 3D full view display mode;
fig. 12B is a panoramic view of the building corresponding to fig. 12A;
FIG. 13A is a schematic view of a 3D partial view display mode;
fig. 13B is a partial schematic view of the building corresponding to fig. 13A.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a naked-eye 3D display device and a display method thereof according to embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the components in the drawings do not reflect the true scale of a naked eye 3D display device, and are only intended to schematically illustrate the present invention.
An embodiment of the present invention provides a naked eye 3D display device, as shown in fig. 1, including:
a liquid crystal display screen 10 configured to display a left-eye image and a right-eye image; specifically, the information displayed by the adjacent pixels or sub-pixels of the liquid crystal display panel 10 comes from different parallax images, i.e., the left eye views the left eye image and the right eye views the right eye image, and thus the pixels or sub-pixels of the liquid crystal display panel 10 are required to be independently controlled;
a collimated backlight 20 configured to provide a light source to the liquid crystal display panel 10; specifically, the higher the degree of collimation of the incident light of the collimated backlight 20, the better, generally within a range of ± 3 ° is required. The collimated backlight 20 may be monochromatic light or compound color light, and may adopt an LED light source in combination with a collimating device (such as a parabolic reflector) to achieve collimation of the backlight;
a first grating 30, the first grating 30 being configured as a phase type grating having a periodic variation of refractive index in the 3D full view display mode; in the 3D partial view display mode and the 2D display mode, the first grating 30 is configured as a transparent glass;
a second grating 40, the second grating 40 being configured as a phase-type grating having a periodic variation of refractive index in the 3D partial view display mode; in the 3D full view display mode and the 2D display mode, the second grating 40 is configured as a transparent glass;
a pupil tracking and gesture recognition system 50 configured to send a control signal that an image that a viewer wants to view is a 3D full view display mode or a 3D partial view display mode according to a focusing position of pupils of both eyes of the viewer and a finger pointing position of the viewer; specifically, the pupil tracking and gesture recognition system 50 may employ an image capture device, such as a CCD camera, to capture an environmental image, calculate a pupil focusing position and a finger pointing position of the viewer through software, and comprehensively determine image information that the viewer wants to obtain; for example, if only the pupil focusing position of the viewer is determined, it indicates that the viewer wants to acquire the 3D full view display mode; if the focusing position of the pupil of the viewer is determined and the position of the viewer pointing to the liquid crystal display screen 10 is obtained for more than 2 seconds, it indicates that the viewer wants to obtain the 3D local view display mode, and feeds back a control signal of the 3D full view display mode or a control signal of the 3D local view display mode to the grating regulation and control system 60 and the display signal control system 70;
a grating regulating system 60 connected to the first grating 30 and the second grating 40, respectively, and configured to control the working states of the first grating 30 and the second grating 40 according to the control signal sent by the pupil tracking and gesture recognition system 50; specifically, the grating regulating and controlling system 60 receives a control signal sent by the pupil tracking and gesture recognizing system 50, controls the working states of the first grating 30 and the second grating 40, controls the first grating 30 to work in an in-situ grating mode in a full 3D full view display mode, and controls the second grating 40 to work in a transparent glass mode; controlling the first grating 30 to work in a transparent glass mode and the second grating 40 to work in an in-situ phase type grating mode in the 3D local view display mode;
and a display signal control system 70 connected to the liquid crystal display 10 and configured to load image data for 3D full view display or image data for 3D partial view display to the liquid crystal display 10 according to the control signal sent by the pupil tracking and gesture recognition system 50.
The naked eye 3D display device provided by the embodiment of the invention acquires the focusing positions of pupils of both eyes of a viewer and the information of the pointing positions of fingers of the viewer through the pupil tracking and gesture recognition system, judges whether the viewer needs the image information of a 3D full view display mode or the image information of a 3D local view display mode, and sends control signals to the raster regulating and controlling system and the display signal controlling system according to the image information required by the viewer, then the grating regulating and controlling system controls the working states of the first grating and the second grating according to the received control signal, and the display signal control system loads image data when 3D full view display or loads image data when 3D partial view display is carried out on the liquid crystal display screen according to the received control signal, so that switchable display of full-view naked eye 3D display and partial-view naked eye 3D display is realized.
Specifically, the liquid crystal display screen provided by the embodiment of the invention is a 2D liquid crystal display screen.
Specifically, the collimated backlight provided by the embodiment of the present invention may be a side-in type collimated backlight, or a direct-out type collimated backlight.
Specifically, in the naked-eye 3D display device provided in the embodiment of the present invention, the first grating and the second grating are both controllable gratings and can be switched to a phase grating mode or a transparent glass mode, and the first grating and the second grating are preferably liquid crystal gratings or polymer dispersed liquid crystal gratings (HPDLC).
Specifically, the liquid crystal grating may include a lower polarizer, a first glass substrate, a first electrode, a liquid crystal molecule layer, a second electrode, a second glass substrate, and an upper polarizer, which are stacked. The liquid crystal grating can form a bright state and a dark state through the regulation and control action of an electric field, and the electric field can be adopted to well drive the switching of the two states, so that the liquid crystal grating is formed.
The polymer dispersed liquid crystal grating (HPDLC) is prepared by utilizing a holographic technology on the basis of Polymer Dispersed Liquid Crystal (PDLC), and the basic material comprises a mixed emulsion which is composed of a polymer monomer and liquid crystal which are main components, and a small amount of photoinitiator and cross-linking agent. During manufacturing, two beams of laser form an interference light field in a material to cause incomplete photopolymerization, monomer molecules in a bright area of the interference light field are polymerized and consumed in large quantity, and the concentration is reduced to generate a concentration gradient in a sample, so that the monomer molecules in a dark area of the light field are diffused to the bright area to supplement the consumed monomer. Since the chemical potential is to be kept in equilibrium, the liquid crystal molecules will diffuse back into the dark areas of the light field. The interdiffusion process forms a periodic arrangement of polymer rich regions and liquid rich crystal regions corresponding to interference bright and dark fringes in the material, and refractive index modulation is generated to generate a Bragg grating structure. Under the condition of no electric field, if a beam of light is incident at a Bragg angle, transmitted light is emitted along the first-order diffraction direction and an external electric field exists, liquid crystal molecules in a rich liquid crystal area are rearranged along the electric field, if the ordinary light refractive index of the liquid crystal molecules is matched with the refractive index of the polymer matrix, the grating disappears, and the incident light can be directly transmitted, namely the grating working mode and the transparent glass working mode of the HPDLC.
In specific implementation, in the naked-eye 3D display device provided in the embodiment of the present invention, the first liquid crystal grating operates in a phase grating mode in the 3D full view display mode, and the second liquid crystal grating operates in a transparent glass mode in the 3D partial view display mode. The first liquid crystal grating and the second liquid crystal grating are composed of grating pixels, each grating pixel corresponds to one pixel on the liquid crystal display screen, and the first liquid crystal grating and the second liquid crystal grating are used for regulating and controlling the light emitting direction of the pixels. Taking the collimated backlight as an example of an edge-type collimated backlight, the collimated backlight includes a collimated light source and a light guide plate, a period of each grating pixel is determined according to a grating equation nsini + sin θ ═ λ/Λ (n is a refractive index of the light guide plate, i is an incident angle, θ is a diffraction angle in air, λ is a light wavelength, and Λ is a grating period), in color display, grating periods corresponding to display pixels with the same light-emitting angle θ of different colors are different, and therefore, a grating period is designed for each pixel of each color separately. The diffraction efficiency of the grating can be controlled by optimizing the grating material, the direct type collimation backlight generally requires the higher the diffraction efficiency of the grating is, the better the direct type collimation backlight is, if the lateral type collimation backlight is adopted, the light needs to be taken out by the grating for multiple times in the transmission process in the light guide plate, the diffraction efficiency of the grating is controlled to ensure that the light is not too high every time the light taking efficiency is not high, and the light is ensured to be transmitted to the last light in the light guide plate and can be taken out.
In specific implementation, in the above naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 2 to 11, the liquid crystal display panel 10 has a plurality of display pixels distributed in an array, the first grating 30 has a plurality of first grating pixels corresponding to the display pixels one to one, and the second grating 40 has a plurality of second grating pixels corresponding to the display pixels one to one;
the 3D full-view display mode is characterized in that the whole 3D image is displayed, and the breadth size of the 3D display image seen by the pupils of a viewer is equivalent to the size of the whole liquid crystal display screen. Since the left and right eyes of the viewer see different images, the display resolution of the 3D full view display mode is low and is inversely proportional to the number of viewpoints. For example, if the lcd panel with a pixel resolution of 1200PPI performs 3 × 3 views of 3D display, the resolution of each view image is 400 PPI. As shown in fig. 12A, taking 3 × 3 viewpoints (viewpoint 1-viewpoint 9) as an example, fig. 12A shows a schematic diagram of an arrangement manner of the first gratings 30, and the second gratings 40 are transparent glass. The first grating 30 is divided into a plurality of first grating units 01, the number of first grating pixels 011 in each first grating unit 01 is the same, for example, 3 × 3 first grating pixels 011 are one first grating unit 01, when in a 3D full view display mode, the grating periods corresponding to the first grating pixels 011 in the same first grating unit 01 are different, that is, the periods of the 3 × 3 first grating pixels 011 in each first grating unit 01 are different, the 3 × 3 first grating pixels 011 periods in each first grating unit 01 are designed according to the grating equation nsini + sin θ λ/Λ, so that diffracted light modulated by the first liquid crystal grating 30 is directed to 3 × 3 viewpoint regions (viewpoints 1 to 9), and the grating periods corresponding to the first grating pixels 011 at the same position in different first grating units 01 are the same, that is, the plurality of first grating units 01 are arranged periodically, until the display area of the whole liquid crystal display screen is full. Because the display pixels of the liquid crystal display screen correspond to the first grating pixels one by one, the display pixels of the liquid crystal display screen are also divided into a plurality of display units, and the pixels of the corresponding visual angle in each display unit display the parallax images of the corresponding visual angle. The observer can see naked eye 3D display of 3 × 3 viewpoint areas (viewpoints 1 to 9) at a certain viewing distance L, and the display image breadth is consistent with the size of the liquid crystal display screen and the resolution is 1/3 of the size of the liquid crystal display screen, as shown in fig. 12B.
The 3D local view display mode is characterized in that partial images are displayed, the requirement on display resolution is high, the requirement on the display resolution is the same as the PPI of the pixel resolution of a liquid crystal display screen, and the size of a display breadth is inversely proportional to the number of viewpoints. For example, if 3 × 3 viewpoints are made for a 3-inch lcd panel, the size of the partially displayed panel is 1 inch. Also taking 3 × 3 viewpoints as an example (it is explained herein that the number of viewpoints in the partial view display mode may be different from the number of viewpoints in the full view display mode), as shown in fig. 13A, fig. 13A shows a schematic diagram of the arrangement of the second gratings 40, and the first gratings are transparent glass. The second grating 40 is divided into a plurality of second grating units 02 (e.g., 3 × 3 second grating units 02), the number of the second grating units 02 is smaller than that of the first grating units 01, the number of second grating pixels (not shown) in each second grating unit 02 is the same, and in the 3D partial view display mode, grating periods corresponding to the second grating pixels in the same second grating unit 02 are the same (i.e., the exit angles θ are the same), and grating periods corresponding to the second grating pixels in different second grating units 02 are different (i.e., the exit angles θ are different), so that diffracted lights corresponding to the second grating pixels in different second grating units 02 are directed to different viewpoints, and diffracted lights corresponding to the second grating pixels in the same second grating unit 02 are directed to the same viewpoint. The display pixels of the lcd panel also correspond to the second grating pixels of the second grating 40 one-to-one, which requires that the display pixels of the lcd panel, the grating pixels of the first grating and the second grating have substantially the same size and dimension (pitch), and are aligned accurately. The liquid crystal display screen is also divided into 3-by-3 viewpoint regions (viewpoints 1-9), and each viewpoint region displays a parallax image of a corresponding viewpoint. The view size of the detailed 3D view seen by the viewer is 1/3 × 1/3 of the size of the liquid crystal display, and the resolution of the parallax image of the corresponding viewpoint displayed in each viewpoint area is the same as the resolution of the liquid crystal display, as shown in fig. 13B.
Therefore, it can be seen from fig. 12A and 13A that the structures of the first grating and the second grating can be reasonably set, and switchable display of full-view naked eye 3D display and partial-view naked eye 3D display is realized by controlling the working states of the first grating and the second grating.
The following describes in detail a specific structure of the naked-eye 3D display device provided by the embodiment of the present invention with collimated backlight as an edge-lit type and a direct-lit type, respectively:
in a possible implementation manner, in the above naked eye 3D display device provided in the embodiment of the present invention, as shown in fig. 2, the collimated backlight may be of a side-in type, the collimated backlight includes a collimated light 21 and a light guide plate 22 with a high degree of collimation, and the light guide plate 22 has a bottom surface 221 and a light emitting surface 222 that are oppositely arranged, and a light incident surface 223 connecting the bottom surface 221 and the light emitting surface 222; specifically, the side-in collimating backlight requires that the incident angle of the collimated light 21 is sufficient for the light to propagate by total reflection (indicated by an arrow) in the light guide plate 22;
the collimated light 21 is located on the light incident surface 223 side of the light guide plate 22, the first grating 30 may be located on the light emitting surface 222 side of the light guide plate 22, the second grating 40 may be located on the side of the first grating 30 departing from the light guide plate 22, and the liquid crystal display 10 is located on the side of the second grating 40 departing from the light guide plate 22. Specifically, since the first grating 30 and the second grating 40 are both located on the light exit surface 222 side of the light guide plate 22, the first grating 30 and the second grating 40 are both transmission type diffraction gratings, and the first grating 30 or the second grating 40 transmits the diffracted light to enter the liquid crystal display panel 10 upward. Specifically, when the liquid crystal display panel operates in the 3D full view display mode, the first grating 30 is in a phase grating operating state, the second grating 40 is made of transparent glass, and the liquid crystal display panel 10 is located on a side of the second grating 40 away from the light guide plate 22, so that light emitted from the light emitting surface 222 of the light guide plate 22 firstly enters the first grating 30 for direction modulation, and then is subjected to intensity modulation through the liquid crystal display panel 10. When the liquid crystal display screen works in the 3D local view display mode, the second grating 40 is in a phase grating working state, the first grating 30 is made of transparent glass, and the liquid crystal display screen 10 is located on one side of the second grating 40, which is far away from the light guide plate 22, so that light emitted from the light emitting surface 222 of the light guide plate 22 firstly enters the second grating 40 for direction modulation, and then intensity modulation is performed through the liquid crystal display screen 10.
In a possible implementation manner, in the above naked eye 3D display device provided in the embodiment of the present invention, as shown in fig. 3, the collimated backlight may be of a side-in type, and includes a collimated light 21 and a light guide plate 22 with high collimation degree, where the light guide plate 22 has a bottom surface 221 and a light-emitting surface 222 that are oppositely arranged, and a light-in surface 223 connecting the bottom surface 221 and the light-emitting surface 222;
the collimated light 21 is located on the light incident surface 223 side of the light guide plate 22, the liquid crystal display 10 is located on the light emitting surface 222 side of the light guide plate 22, the first grating 30 may be located on a side of the liquid crystal display 10 away from the light guide plate 22, and the second grating 40 may be located between the first grating 30 and the liquid crystal display 10. Specifically, since the first grating 30 and the second grating 40 are both located on the light exit surface side of the liquid crystal display panel 10, the first grating 30 and the second grating 40 are both transmission type diffraction gratings, and the diffracted light is transmitted by the first grating 30 or the second grating 40 to enter the liquid crystal display panel 10 upwards. Specifically, when the lcd panel operates in the 3D full view display mode, the first grating 30 is in a phase grating operating state, the second grating 40 is made of transparent glass, and the liquid crystal display 10 is located between the second grating 40 and the light emitting surface 222 of the light guide plate 22, so that the light emitted from the light emitting surface 222 of the light guide plate 22 passes through the liquid crystal display 10 for intensity modulation, and then enters the first grating 30 for direction modulation. When the liquid crystal display panel works in the 3D local view display mode, the second grating 40 is in a phase grating working state, the first grating 30 is made of transparent glass, and the liquid crystal display panel 10 is located between the second grating 40 and the light-emitting surface 222 of the light guide plate 22, so that light emitted from the light-emitting surface 222 of the light guide plate 22 is subjected to intensity modulation through the liquid crystal display panel 10 and then enters the second grating 40 for direction modulation.
In a possible implementation manner, in the above naked eye 3D display device provided in the embodiment of the present invention, as shown in fig. 4, the collimated backlight may be of a side-in type, the collimated backlight includes a collimated light 21 and a light guide plate 22 with a high degree of collimation, and the light guide plate 22 has a bottom surface 221 and a light emitting surface 222 that are oppositely arranged, and a light incident surface 223 connecting the bottom surface 221 and the light emitting surface 222;
the collimated light 21 is located at the light incident surface 223 of the light guide plate 22, the liquid crystal display 10 is located at the light emitting surface 222 side of the light guide plate 22, the first grating 30 may be located at the bottom surface 221 side of the light guide plate 22, and the second grating 40 may be located between the light emitting surface 222 of the light guide plate 22 and the liquid crystal display 10. Specifically, since the first grating 30 is located on the bottom surface 221 side of the light guide plate 22, the first grating 30 is a reflection type diffraction grating, and the first grating 30 reflects the diffracted light upward to enter the liquid crystal display panel 10; since the second grating 40 is located on the light exit surface 222 side of the light guide plate 22, the second grating 40 is a transmission type diffraction grating, and the diffracted light is transmitted by the second grating 40 and enters the liquid crystal display panel 10 upward. Specifically, when the liquid crystal display panel operates in the 3D full view display mode, the first grating 30 is in a phase grating operating state, the second grating 40 is made of transparent glass, and the liquid crystal display panel 10 is located on a side of the second grating 40 away from the light guide plate 22, and the first grating 30 is located on a side of the bottom surface 221 of the light guide plate, so that light emitted from the light emitting surface 222 of the light guide plate 22 firstly enters the first grating 30 for directional modulation, and then passes through the liquid crystal display panel 10 for intensity modulation. When the liquid crystal display screen operates in the 3D local view display mode, the second grating 40 is in a phase grating operating state, the first grating 30 is made of transparent glass, and the liquid crystal display screen 10 is located on a side of the second grating 40 away from the light guide plate 22, so that light emitted from the light emitting surface 222 of the light guide plate 22 firstly enters the second grating 40 for directional modulation, and then is subjected to intensity modulation by the liquid crystal display screen 10.
In a possible implementation manner, in the above naked eye 3D display device provided in the embodiment of the present invention, as shown in fig. 5, the collimated backlight may be of a side-in type, the collimated backlight includes a collimated light 21 and a light guide plate 22 with a high degree of collimation, and the light guide plate 22 has a bottom surface 221 and a light exit surface 222 that are oppositely arranged, and a light incident surface 223 connecting the bottom surface 221 and the light exit surface 222;
the collimated light 21 is located at the light incident surface 223 of the light guide plate 22, the liquid crystal display 10 is located at the light emitting surface 222 side of the light guide plate 22, the first grating 30 may be located at the bottom surface 221 side of the light guide plate 22, and the second grating 40 may be located at the side of the liquid crystal display 10 away from the light guide plate 22. Specifically, since the first grating 30 is located on the bottom surface 221 side of the light guide plate 22, the first grating 30 is a reflection type diffraction grating, and the light diffracted by the first grating 30 is reflected upward and enters the liquid crystal display panel 10; since the second grating 40 is located on the light output surface side of the liquid crystal display panel 10, the second grating 40 is a transmission type diffraction grating, and the diffracted light is transmitted by the second grating 40 and enters the liquid crystal display panel 10 upward. Specifically, when the lcd panel operates in the 3D full view mode, the first grating 30 is in a phase grating operating state, the second grating 40 is made of transparent glass, and the liquid crystal display panel 10 is located on one side of the light exit surface 222 of the light guide plate 22, and the first grating 30 is located on one side of the bottom surface 221 of the light guide plate, so that light emitted from the light exit surface 222 of the light guide plate 22 firstly enters the first grating 30 for directional modulation, and then passes through the liquid crystal display panel 10 for intensity modulation. When the lcd panel works in the 3D local view display mode, the second grating 40 is in a phase grating working state, the first grating 30 is made of transparent glass, and the liquid crystal display 10 is located between the second grating 40 and the light-emitting surface 222 of the light guide plate 22, so that the light emitted from the light-emitting surface 222 of the light guide plate 22 passes through the liquid crystal display 10 to be subjected to intensity modulation, and then enters the second grating 40 to be subjected to direction modulation.
In a possible implementation manner, in the above naked eye 3D display device provided in the embodiment of the present invention, as shown in fig. 6, the collimated backlight may be of a side-in type, the collimated backlight includes a collimated light 21 and a light guide plate 22 with a high degree of collimation, and the light guide plate 22 has a bottom surface 221 and a light exit surface 222 that are oppositely arranged, and a light incident surface 223 connecting the bottom surface 221 and the light exit surface 222;
the collimated light 21 is located at the light incident surface 223 of the light guide plate 22, the liquid crystal display 10 is located at the light emitting surface 222 side of the light guide plate 22, the first grating 30 may be located at the bottom surface 221 side of the light guide plate 22, and the second grating 40 may be located at the side of the first grating 30 away from the light guide plate 22. Specifically, since the first grating 30 and the second grating 40 are both located on the bottom surface 221 side of the light guide plate 22, the first grating 30 and the second grating 40 are both reflection type diffraction gratings, and the first grating 30 or the second grating 40 reflects the diffracted light upward to enter the liquid crystal display panel 10. Specifically, when the display panel operates in the 3D full view display mode, the first grating 30 is in a phase grating operating state, the second grating 40 is made of transparent glass, and the liquid crystal display panel 10 is located on a side of the light guide plate 22 away from the first grating 30, so that light emitted from the light guide plate 22 firstly enters the first grating 30 to be modulated in direction, and then is modulated in intensity through the liquid crystal display panel 10. When the display panel works in a 3D local view display mode, the second grating 40 is in a phase grating working state, the first grating 30 is transparent glass, and the liquid crystal display screen 10 is positioned on one side of the light guide plate 22, which is far away from the first grating 30, so that light emitted from the light guide plate 22 firstly enters the second grating 40 to be subjected to direction modulation, and then is subjected to intensity modulation through the liquid crystal display screen 10.
In a possible implementation manner, in the above-mentioned naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 7, the collimated backlight 20 may be a direct type, the collimated backlight 20 is located on one side of the light incident surface of the liquid crystal display panel 10, the naked-eye 3D display device further includes a grating substrate 50, the first grating 30 may be located between the grating substrate 50 and the liquid crystal display panel 10, and the second grating 40 may be located between the first grating 30 and the liquid crystal display panel 10. Specifically, the incident angle of the direct type collimating backlight 20 can be determined according to the required exit angle and the grating equation, and the direct type collimating backlight 20 can be shaped by using a point light source or a line light source plus an optical element. The grating substrate 50 is used as a carrier of optical transmission and optical elements, and is required to be transparent and have high transmittance, the upper surface and the lower surface have good parallelism and flatness, and the grating substrate 50 is preferably a glass substrate.
Specifically, as shown in fig. 7, since the first grating 30 and the second grating 40 are both located on the light exit surface side of the collimated backlight 20, the first grating 30 and the second grating 40 are both transmission type diffraction gratings, and the diffracted light is transmitted by the first grating 30 or the second grating 40 to enter the liquid crystal display panel 10 upward.
In a possible implementation manner, in the above naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 8, the collimated backlight 20 may be a direct type, the collimated backlight 20 is located on a light incident surface side of the liquid crystal display 10, the first grating 30 may be located on a side of the liquid crystal display 10 away from the collimated backlight 20, and the second grating 40 may be located between the first grating 30 and the liquid crystal display 10. Specifically, since the first grating 30 and the second grating 40 are both located on the light exit surface side of the liquid crystal display panel 10, the first grating 30 and the second grating 40 are both transmission type diffraction gratings, and the diffracted light is transmitted by the first grating 30 or the second grating 40 to enter the liquid crystal display panel 10 upwards.
In a possible implementation manner, in the above naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 9, the collimated backlight 20 may be a direct type, the collimated backlight 20 is located on a light incident surface side of the liquid crystal display panel 10, the first grating 30 may be located on a side of the collimated backlight 20 away from the liquid crystal display panel 10, and the second grating 40 may be located between the collimated backlight 20 and the liquid crystal display panel 10. Specifically, since the first grating 30 is located on the side of the light exit surface away from the collimated backlight 20, the first grating 30 is a reflection type diffraction grating, and the light diffracted by the first grating 30 is reflected upwards to enter the liquid crystal display screen 10; since the second grating 40 is located on the light emitting surface side of the collimated backlight 20, the second grating 40 is a transmissive diffraction grating, and the second grating 40 transmits the diffracted light upward to enter the liquid crystal display panel 10.
In a possible implementation manner, in the above naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 10, the collimated backlight 20 may be a direct type, the collimated backlight 20 is located on a light incident surface side of the liquid crystal display 10, the first grating 30 may be located on a side of the collimated backlight 20 away from the liquid crystal display 10, and the second grating 40 may be located on a side of the liquid crystal display 10 away from the collimated backlight 20. Specifically, since the first grating 30 is located on the side of the light exit surface away from the collimated backlight 20, the first grating 30 is a reflection type diffraction grating, and the light diffracted by the first grating 30 is reflected upwards to enter the liquid crystal display screen 10; since the second grating 40 is located on the light output surface side of the liquid crystal display panel 10, the second grating 40 is a transmission type diffraction grating, and the diffracted light is transmitted by the second grating 40 and enters the liquid crystal display panel 10 upward.
In a possible implementation manner, in the above naked-eye 3D display device provided in the embodiment of the present invention, as shown in fig. 11, the collimated backlight 20 may be a direct type, the collimated backlight 20 is located on a light incident surface side of the liquid crystal display 10, the first grating 30 may be located on a side of the collimated backlight 20 away from the liquid crystal display 10, and the second grating 40 may be located on a side of the first grating 30 away from the liquid crystal display 10. Specifically, since the first grating 30 and the second grating 40 are both located on the side of the light exit surface away from the collimated backlight 20, the first grating 30 and the second grating 40 are both reflective diffraction gratings, and the diffracted light is reflected by the first grating 30 or the second grating 40 to enter the liquid crystal display panel 10 upwards.
It should be noted that the principle of modulating light by the first grating 30, the second grating 40 and the liquid crystal display screen 10 in fig. 7 is the same as that in fig. 2, the principle of modulating light by the first grating 30, the second grating 40 and the liquid crystal display screen 10 in fig. 8 is the same as that in fig. 3, the principle of modulating light by the first grating 30, the second grating 40 and the liquid crystal display screen 10 in fig. 9 is the same as that in fig. 4, the principle of modulating light by the first grating 30, the second grating 40 and the liquid crystal display screen 10 in fig. 10 is the same as that in fig. 5, and the principle of modulating light by the first grating 30, the second grating 40 and the liquid crystal display screen 10 in fig. 11 is the same as that in fig. 6, which will not be described in detail.
In specific implementation, as shown in fig. 2 to 11, the liquid crystal display panel 1 may satisfy the requirement of monochrome display to realize gray scale display, and may include a lower polarizer, a TFT array substrate, a liquid crystal layer, and an upper polarizer, for example. The color display is added with a color film. The liquid crystal display pixels and the raster pixels are required to be in a one-to-one correspondence. In color display, each display pixel is divided into three RGB sub-pixels, and each raster pixel is also divided into RGB raster sub-pixels, which are respectively in one-to-one correspondence. The periods of the sub-pixels under the same grating pixel are different, so that the light emitting directions of the RGB sub-pixels are kept consistent. And therefore each grating sub-pixel is designed separately. In addition, in order to prevent crosstalk between display pixels with different viewing angles, the distance between the liquid crystal display panel 10 and the first and second gratings 30 and 40 needs to be as low as possible.
In summary, the naked-eye 3D display devices shown in fig. 2 to 11 provided by the embodiments of the present invention can realize switchable display of full-view naked-eye 3D display and partial-view naked-eye 3D display by controlling the working states of the first grating and the second grating according to the requirements of the viewer.
Specifically, the naked-eye 3D display device provided by the embodiment of the present invention may be applied to various scenes, for example, the device is suitable for desktop display of products, and customers need to acquire the full view of the products and also want to know some detailed information. For example, in a building exhibition, a customer can observe the entire view of the whole cell in a full view mode, and the customer can observe the specific environment around the house or even the specific layout inside the house, which needs a high-resolution display, in a detail view mode; and so on.
The naked eye 3D display device provided by the embodiment of the invention acquires the focusing positions of pupils of both eyes of a viewer and the information of the pointing positions of fingers of the viewer through a pupil tracking and gesture recognition system, judges whether the viewer needs the image information of a 3D full view display mode or the image information of a 3D local view display mode, and sends control signals to the raster regulating and controlling system and the display signal controlling system according to the image information required by the viewer, then the grating regulating and controlling system controls the working states of the first grating and the second grating according to the received control signal, and the display signal control system loads image data during 3D full-view display or loads image data during 3D partial-view display to the liquid crystal display screen according to the received control signal, so that switchable display of full-view naked-eye 3D display and partial-view naked-eye 3D display is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A naked eye 3D display device, comprising:
a liquid crystal display configured to display a left-eye image and a right-eye image;
a collimated backlight configured to provide a light source to the liquid crystal display panel;
a first grating configured as a phase-type grating having a periodic variation of a refractive index in a 3D full view display mode; the first grating is configured as transparent glass in a 3D partial view display mode and a 2D display mode;
a second grating configured as a phase-type grating having a periodic variation of refractive index in a 3D partial view display mode; the second grating is configured as transparent glass in a 3D full-view display mode and a 2D display mode;
the pupil tracking and gesture recognition system is configured to send a control signal that an image that a viewer wants to view is in a 3D full view display mode or a 3D partial view display mode according to the focusing positions of pupils of two eyes of the viewer and the pointing position of a finger of the viewer;
the grating regulating system is respectively connected with the first grating and the second grating and is configured to control the working states of the first grating and the second grating according to the control signal sent by the pupil tracking and gesture recognition system;
and the display signal control system is connected with the liquid crystal display screen and is configured to load image data during 3D full-view display or image data during 3D partial-view display to the liquid crystal display screen according to the control signal sent by the pupil tracking and gesture recognition system.
2. The naked eye 3D display device according to claim 1, wherein the liquid crystal display screen has a plurality of display pixels distributed in an array, the first raster has a plurality of first raster pixels in one-to-one correspondence with the display pixels, and the second raster has a plurality of second raster pixels in one-to-one correspondence with the display pixels;
the first grating is divided into a plurality of first grating units, the number of first grating pixels in each first grating unit is the same, when the 3D full-view display mode is adopted, grating periods corresponding to the first grating pixels in the same first grating unit are different, and grating periods corresponding to the first grating pixels at the same positions in different first grating units are the same;
the second grating is divided into a plurality of second grating units, the number of the second grating units is smaller than that of the first grating units, the number of second grating pixels in each second grating unit is the same, and in a 3D local view display mode, grating periods corresponding to the second grating pixels in the same second grating unit are the same, and grating periods corresponding to the second grating pixels in different second grating units are different.
3. The naked eye 3D display device of claim 1, wherein the collimated backlight is of a lateral type, the collimated backlight comprises a collimated light and a light guide plate, and the light guide plate is provided with a bottom surface, a light emitting surface and a light incident surface, the bottom surface and the light emitting surface are arranged oppositely, and the light incident surface is connected with the bottom surface and the light emitting surface;
collimated light is located income plain noodles one side of light guide plate, first grating is located go out plain noodles one side of light guide plate, the second grating is located first grating deviates from one side of light guide plate, liquid crystal display is located the second grating deviates from one side of light guide plate.
4. The naked-eye 3D display device of claim 1, wherein the collimated backlight is of a lateral type, the collimated backlight comprises a collimated light and a light guide plate, the light guide plate is provided with a bottom surface and a light-emitting surface which are oppositely arranged, and a light-incident surface connecting the bottom surface and the light-emitting surface;
collimated light is located income plain noodles one side of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located liquid crystal display deviates from one side of light guide plate, the second grating is located first grating with between the liquid crystal display.
5. The naked-eye 3D display device of claim 1, wherein the collimated backlight is of a lateral type, the collimated backlight comprises a collimated light and a light guide plate, the light guide plate is provided with a bottom surface and a light-emitting surface which are oppositely arranged, and a light-incident surface connecting the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located play plain noodles of light guide plate with between the liquid crystal display.
6. The naked-eye 3D display device of claim 1, wherein the collimated backlight is of a lateral type, the collimated backlight comprises a collimated light and a light guide plate, the light guide plate is provided with a bottom surface and a light-emitting surface which are oppositely arranged, and a light-incident surface connecting the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located liquid crystal display deviates from one side of light guide plate.
7. The naked-eye 3D display device of claim 1, wherein the collimated backlight is of a lateral type, the collimated backlight comprises a collimated light and a light guide plate, the light guide plate is provided with a bottom surface and a light-emitting surface which are oppositely arranged, and a light-incident surface connecting the bottom surface and the light-emitting surface;
collimated light is located the income plain noodles of light guide plate, liquid crystal display is located play plain noodles one side of light guide plate, first grating is located bottom surface one side of light guide plate, the second grating is located first grating deviates from one side of light guide plate.
8. The naked eye 3D display device of claim 1, wherein the collimated backlight is direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the naked eye 3D display device further comprises a grating substrate, the first grating is located between the grating substrate and the liquid crystal display screen, and the second grating is located between the first grating and the liquid crystal display screen.
9. The naked-eye 3D display device of claim 1, wherein the collimated backlight is direct-lit, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the liquid crystal display screen, the side of the liquid crystal display screen is away from the collimated backlight, and the second grating is located between the first grating and the liquid crystal display screen.
10. The naked-eye 3D display device of claim 1, wherein the collimated backlight is direct-lit, the collimated backlight is located on one side of an incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, the side of the collimated backlight being away from the liquid crystal display screen, and the second grating is located between the collimated backlight and the liquid crystal display screen.
11. The naked eye 3D display device of claim 1, wherein the collimated backlight is direct type, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, which is far away from the liquid crystal display screen, and the second grating is located on one side of the liquid crystal display screen, which is far away from the collimated backlight.
12. The naked-eye 3D display device of claim 1, wherein the collimated backlight is direct-lit, the collimated backlight is located on one side of the light incident surface of the liquid crystal display screen, the first grating is located on one side of the collimated backlight, which is far away from the liquid crystal display screen, and the second grating is located on one side of the first grating, which is far away from the liquid crystal display screen.
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