CN109324443A - A kind of backlight module, display device and optical device - Google Patents
A kind of backlight module, display device and optical device Download PDFInfo
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- CN109324443A CN109324443A CN201811412961.8A CN201811412961A CN109324443A CN 109324443 A CN109324443 A CN 109324443A CN 201811412961 A CN201811412961 A CN 201811412961A CN 109324443 A CN109324443 A CN 109324443A
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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
-
- 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
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention provides a kind of backlight module, display device and optical device, wherein backlight module includes: backlight；Diffraction optics film, the diffraction optics film are used to the light that each point light source in the backlight projects being oriented beam splitting, form at least two pictures.A kind of backlight module, display device and optical device provided by the invention, can be thinned the thickness of display device and optical device.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of backlight modules, display device and optical device.
Background technique
(Thin Film Transistor Liquid Crystal Display, Thin Film Transistors-LCD are aobvious by TFT-LCD
Show device) in have for providing the backlight module of light source.Backlight module includes straight-down negative and side entering type, wherein has straight-down negative
The display device colour gamut of backlight module is wider, and the image effect of presentation is more natural.
With the continuous development of display technology with the selection of user's purchase, the aesthetics of the thinner presentation of display device is found more
Height is also more liked by consumer.However, down straight aphototropism mode set is bright in order to avoid occurring during display in the prior art
Striped (Hotspot phenomenon) between dark phase, needs to guarantee the enough height in light mixing area, that is, needs to guarantee between light source and diffusion sheet
Spacing distance, cause display device and the thicker problem of optical device, be unfavorable for the trend of display device ultrathin.
Summary of the invention
The embodiment of the present invention provides a kind of backlight module, display device and optical device, to solve to mix in backlight module
Light region height is higher, causes display device and the thicker problem of optical device.
It is as follows that in order to solve the above technical problem, the present invention provides technical solutions:
In a first aspect, the embodiment of the present invention provides a kind of backlight module characterized by comprising
Backlight；
Diffraction optics film, the light that the diffraction optics film is used to project each point light source in the backlight carry out
Beam splitting is oriented, at least two pictures are formed.
Further, the diffraction optics film includes spreading out for one-dimensional diffraction optical element, two-dimentional diffraction optical element, three-dimensional
Penetrate optical element, Meta Materials surface or binary optical elements.
It further, further include even smooth film, the even smooth film is set to the diffraction optics film away from the backlight
Side.
Further, the backlight is blue-light source.
It further, further include quantum dot film, the quantum dot film is set to the diffraction optics film away from the backlight
The side in source.
It further, further include at least one layer of prismatic lens, at least one layer prismatic lens are set to the quantum dot film back
Side from the backlight.
Further, the backlight includes multiple secondary millimeter light emitting diode Mini LED or miniature of array arrangement
Diode Micro LED.
Second aspect, the embodiment of the present invention also provide a kind of display device, including backlight module as described above.
The third aspect, the embodiment of the present invention also provide a kind of optical device, including backlight module as described above.
Further, the optical device includes beam expanding lens and focus lamp, and the beam expanding lens is set to the diffraction optics
Between film and the backlight, the focus lamp is set to the side that the diffraction optics film deviates from the backlight.
In technical solution provided by the invention, by diffraction optics film by backlight each point light source project light
It is oriented beam splitting, forms at least two pictures, to enhance each irradiant mixability of point light source in backlight, is reduced mixed
The height in light area achievees the effect that the thickness of thinned backlight module.Therefore, display can be thinned in technical solution provided by the invention
The thickness of device and optical device.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the backlight module that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides backlight module in diffraction optics membrane orienting beam splitting structural schematic diagram；
Fig. 3 a is the beam pattern in a kind of backlight module of salt free ligands optical film；
Fig. 3 b is the corresponding image of light beam in Fig. 3 a；
Fig. 3 c is the display renderings of the corresponding display device of Fig. 3 b；
Fig. 4 a be another embodiment of the present invention provides backlight module in beam pattern；
Fig. 4 b is the corresponding image of light beam in Fig. 4 a；
Fig. 4 c is the display renderings of the corresponding display device of Fig. 4 b；
Fig. 5 a is a kind of image of the backlight module of salt free ligands optical film；
Fig. 5 b is the image for the backlight module that one embodiment of the invention provides；
Fig. 6 be another embodiment of the present invention provides backlight module in row's point light source image；
Fig. 7 be another embodiment of the present invention provides backlight module in the structure of micro-structure of two-dimentional diffraction optical element show
One of be intended to；
Fig. 8 be another embodiment of the present invention provides backlight module in the structure of micro-structure of two-dimentional diffraction optical element show
The two of intention；
Fig. 9 is the cross-sectional view of the micro-structure of two-dimentional diffraction optical element in Fig. 7；
Figure 10 a be another embodiment of the present invention provides backlight module in diffraction optics film include one-dimensional diffraction optical element
When beam splitting effect picture；
Figure 10 b be another embodiment of the present invention provides backlight module in diffraction optics film include two-dimentional diffraction optical element
When beam splitting effect picture；
Figure 11 a is the image of the backlight module of salt free ligands optical film；
Figure 11 b be another embodiment of the present invention provides backlight module in diffraction optics film include two-dimentional diffraction optical element
When image；
Figure 12 be another embodiment of the present invention provides backlight module in binary optical elements beam splitting schematic diagram；
Figure 13 be another embodiment of the present invention provides backlight module structural schematic diagram；
Figure 14 is the structural schematic diagram for the optical device that one embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Down straight aphototropism mode set needs to guarantee to mix in the prior art in order to avoid there is Hotspot phenomenon during display
The enough height in light area need to guarantee the spacing distance between light source and diffusion sheet, cause the problem that display device is thicker, no
Conducive to the trend of display device ultrathin.
Therefore, the embodiment of the present invention provides a kind of backlight module, display device and optical device, can reduce backlight module
The height in middle light mixing area, and then reduce the thickness of display device and optical device.
As shown in Figure 1, the embodiment of the present invention provides a kind of backlight module 100, comprising: backlight 101；Diffraction optics film
102, the diffraction optics film 102 is used to the light that each point light source in the backlight 101 projects being oriented beam splitting,
Form at least two pictures.
In technical solution provided by the invention, each point light source in backlight 101 is projected by diffraction optics film 102
Light be oriented beam splitting, at least two pictures are formed, to enhance each irradiant mixing journey of point light source in backlight 101
Degree, can reduce the height in light mixing area, achievees the effect that the thickness of thinned backlight module.Therefore, technical side provided by the invention
The thickness of display device and optical device can be thinned in case.
Above-mentioned backlight module is down straight aphototropism mode set.Display device colour gamut with down straight aphototropism mode set is wider, is in
Existing image effect is more natural.
Above-mentioned backlight includes the point light source of multiple array arrangements, has certain spacing distance between adjacent point light source,
Specific spacing distance can be between 3-4mm, preferably 3.5mm.
The light that point light source issues is oriented beam splitting using diffraction principle by diffraction optics film, as shown in Fig. 2, by pair
The setting of diffraction optics film parameters enable to a point light source issue light beam splitting be multi beam, at certain light mixing distance
Multiple pictures are formed in visual effect.Beam pattern in the backlight module of salt free ligands optical film is as shown in Figure 3a, and Fig. 3 b is in Fig. 3 a
The corresponding image of light beam, Fig. 3 c are the display renderings of the corresponding display device of Fig. 3 b；There is the backlight module of diffraction optics film
As shown in fig. 4 a, Fig. 4 b is the corresponding image of light beam in Fig. 4 a to interior beam pattern, and Fig. 4 c is the corresponding display device of Fig. 4 b
Display renderings.It can be seen that the Hotspot phenomenon in Fig. 3 c is obviously many compared to Fig. 4 c.
By taking the light that diffraction optics film projects a point light source is oriented beam splitting 3 pictures of formation as an example: 3 point light sources
It forms 3 pictures (as shown in Figure 5 a) originally at certain light mixing distance, is capable of forming 9 by 3 point light sources after diffraction optics film
A picture (as shown in Figure 5 b).
Each point light source can form at least two pictures in backlight, to increase between the light that each point light source issues
Mixability, backlight module can be reduced under the premise of avoiding the occurrence of Hotspot phenomenon to the requirement for height in light mixing area, from
And realizing reduces light mixing area height, achievees the effect that thinned backlight module thickness, and then reaches thinned display device and optics is set
The effect of standby thickness.
Diffraction optics film is periodic continuous structure, therefore point light source is not necessarily to align with diffraction optics film and be arranged, as long as
Point light source is located at the incident side of diffraction optics film, and diffraction optics film can reach the light beam orientation beam splitting projected to point light source
Effect.
Further, above-mentioned diffraction optics film may include one-dimensional diffraction optical element, two-dimentional diffraction optical element, three-dimensional
Diffraction optical element, Meta Materials surface or binary optical elements.
Diffraction optical element can be produced on the modeling of poly terephthalic acid class by semiconductor technology or nanometer embossing
Expect on (PET), to form diffraction optics film.
Wherein, one-dimensional diffraction optical element can carry out diffraction to light in one dimension, and one-dimensional diffraction element can
To carry out the modulation of shooting angle according to the grating equation of formula 1:
M λ=d (sin α ± sin β)；(formula 1)
Wherein, m is diffraction time；λ is the wavelength value of incident beam；D is screen periods；α is that light injects entering for grating
Firing angle degree；β is that light passes through the shooting angle after optical grating diffraction.
It therefore, can be by adjusting screen periods, i.e., after recognizing the irradiant wavelength of point light source and incident angle
It is modulated to obtain desired shooting angle.
Two-dimentional diffraction optical element can carry out diffraction to light on two dimensions, be respectively with two dimension directions
X-direction and Y-direction, and for X-direction is vertical with Y-direction, with reference to following formula:
Wherein, m1 and m2 is diffraction time and is integer, such as: 0, ± 1, ± 2 etc.；λ is the wavelength value of incident beam；
α is the angle of emergent ray and X-axis；β is the angle of emergent ray and Y-axis；γ is the angle of emergent ray and Z axis；L is to receive
Identity distance is with a distance from optical grating diffraction face；A is the period of grating in the X direction；B is the period of grating in the Y direction.
From formula 2 and formula 3 it can be seen that X and Y is directly proportional to distance L, so adjustment distance L can only be such that diffraction is formed
As zooming in or out, and the ratio λ/a and λ/b of wavelength and screen periods can determine the geometric shape for the picture that diffraction is formed, when
A, after b, λ and L are determined, the specific value of m1 and m2 is substituted into the center that formula can calculate the picture of diffraction formation.
Assuming that point light source arrangement is that rectangular array is arranged, 3.5mm is divided between arrangement, the size of each point light source is 0.38*
0.38mm, wherein (solid-line rectangle indicates that script point light source is formed to the picture formed after row's point light source diffraction in Fig. 6 as shown in Figure 6
Picture, dashed rectangle indicates the diffraction image because increasing generation after diffraction optics film diffraction), each point light source diffraction around it produces
Raw diffraction image, is equivalent to and produces two pictures between original point light source, is equivalent to point light source arrangement interval at this time and narrows down to
1.166mm, to enhance the light mixing degree between each point light source.According to required backlight module thickness, convolution 2 and formula
3 can calculate the period of corresponding two-dimentional diffraction optical element.It is right when 2mm, 2.5mm when mould group thickness is respectively 1.5mm
The two-dimensional grating period answered is respectively 733.7nnm, 893.7nm, 1065nm.Preferably, the period of two-dimensional grating can choose
900nm。
By coating certain thickness photoresist on substrate, then passes through exposure technology, expose set out on a photoresist
Corresponding two-dimensional grating pattern is counted, then by developing process, obtains designing corresponding two-dimensional grating micro-structure (two-dimentional diffraction light
The micro-structure for learning element is periodicity arrangement in X-direction and Y-direction, and the shape of micro-structure can be made according to actual needs
The shapes such as rectangle, taper, sinusoidal can be interval setting between micro-structure and set as shown in fig. 7, being also possible to be bound up
Set as shown in Figure 8), finally by transfer printing process, two-dimensional grating structure is transferred on the substrate of corresponding thickness.In addition, please join
Read Fig. 9, for the cross-sectional view of two-dimentional diffraction optical element, by change micro-structure design parameter (such as: the quantity of step, platform
Whether rank depth, step are symmetrical) it can change the number of beams of beam splitting.
Wherein, in exposure and imaging technical process, need to control time for exposure and developing time, by control this two
A time regulates and controls the duty ratio of two-dimensional grating, thus to regulate and control diffraction energy in the distribution accounting of each level, so that diffraction
Energy can be divided equally to the greatest extent on 0 and ± 1 grade of diffracted beam, and better even light effect is reached.Preferably, duty ratio exists
Between 0.7 to 08.
The beam splitting effect picture of one-dimensional diffraction optical element as shown in Figure 10 a, the beam splitting effect picture of two-dimentional diffraction optical element
As shown in fig. lob, it can be seen that compared to diffraction optical device two-dimentional for one-dimensional diffraction optical element light mixing effect more preferably.
Furthermore it is possible to which 1000 diffraction periods are arranged in every millimeter of diffraction optics film, i.e., the size in each diffraction period is 1 micro-
Rice, so as to the thickness for making diffraction optics film reach relatively thin.In addition, in a specific embodiment, the backlight of salt free ligands optical film
The image of mould group as shown in fig. 11a, after adding two-dimentional diffraction optical element, the image of the backlight module of diffraction optics film
As shown in figure 11b.
Three dimensional diffraction optical element can carry out diffraction, diffraction principle and one-dimensional diffraction light to light in three dimensions
It is identical with two-dimentional diffraction optical element to learn element, to avoid repeating no longer specific herein discuss.
Binary optical elements refer to the diffraction theory based on light wave, using CAD, and with ultra-large collection
At (VLSI) circuit production technique, in chip base or Traditional optics surface etch generates the embossment of at least two step depths
Structure forms pure phase position, coaxial reproduction, a kind of diffraction optical element with high diffraction efficiency, such as: Fresnel Lenses,
Darman raster.
The diffraction of binary optical elements is as shown in figure 12, binary optical elements may be implemented for 1 beam light to be beamed into 9 beams,
16 beams even 64 beams.Binary optical elements be by bits of modulation mutually come change light propagation path, specifically how to change light
Propagation path refer to following formula:
Wherein, M is diffraction time；N is the order of phase function；AiIt is distributed for the initial amplitude of light field；ρ is the first of light field
Beginning phase mehtod；ξ (ρ) is the optical field distribution obtained after being modulated by binary optical elements.
Therefore, A is distributed in the initial amplitude for recognizing light fieldi, light field initial phase mehtod ρ and demand optical field distribution
It afterwards, can be that is, modulated to obtain desired beam splitting quantity and shooting angle by the order N of adjusting phase function.
According to the spacing distance that pointolite array is arranged, the binary optical of parameter corresponding with pointolite array arrangement is produced
After element, be produced in PET base material, the light beam that the diffraction optics film of formation issues point light source according to design beam splitting direction and
Quantity is split, and as shown in Figs. 4a and 4b, to play the role of improving even light effect, reduces light mixing area height.
It is identical that Meta Materials surface and binary optical elements change the principle of light propagation path, and by bits of modulation mutually come
Change light propagation path, to avoid repeating no longer specific herein discuss.
Further, the backlight module further includes even smooth film, and the even smooth film, which is set to the diffraction optics film, to deviate from
The side of the backlight.So as to which light after light mixing is carried out Homogenization Treatments, the even light effect of backlight module is improved.
In some alternative embodiments, the backlight can be blue-light source, the wavelength for the light that blue light source projects
It can be between 450-490nm.
Further, as shown in figure 13, the backlight module 1300 can also include quantum dot film 1303, the quantum dot
Film is set to the side that the diffraction optics film 1302 deviates from the backlight 1301.
Quantum dot film 1303 can convert blue light into white light.Quanta point material in quantum dot film 1303 is similar to fluorescence
Powder and a kind of luminescence generated by light effect.Quantum dot is a kind of semiconductor of Nano grade, by this nano semiconductor material
Apply certain electric field or optical pressure, they will issue the light of specific frequency, and the frequency of the light issued can partly be led with nanometer
The size of body changes and changes, thus the size by adjusting Nano semiconductor can control the color of the light of its sending.It is logical
All it is often short wavelength light excitation, by Stokes shift, the long glistening light of waves is generated, therefore, in blue light of the wavelength between 450-490nm
Under excitation, Nano semiconductor can launch the light of green band and red band, the light mixing of three kinds of colors of final RGB
Generate white light.
In addition, as shown in figure 13, the backlight module 1300 can also include at least one layer of prismatic lens 1304, it is described at least
One layer of prismatic lens 1304 are set to the side that the quantum dot film 1303 deviates from the backlight 1301.
Prismatic lens 1304, which can be the prism structure made of acrylic resin and be produced in PET base material, to be fabricated.Back
When passing through prismatic lens 1304, only light of the incident light within a certain angular range can just lead to the light that light source 1301 projects
Superrefraction effect outgoing, remaining light are reflected back light source by prismatic lens 1304 due to being unsatisfactory for refracting condition, then by light source bottom
Reflector plate effect and be emitted again.In this way, the light in backlight 1301 is under the action of prismatic lens 1304, it is continuous to recycle
It utilizes, for the light dissipated originally to all directions after through prismatic lens 1304, being controlled to can only be from preset angular range
Interior injection, to achieve the effect that enhance 1300 emitting brightness of backlight module.
In some alternative embodiments, above-mentioned backlight includes multiple secondary millimeter light emitting diode Mini of array arrangement
LED or microdiode Micro LED.
It is about current mainstream LED that Micro LED, which is by LED structure design progress filming, microminiaturization and array, volume,
The 1% of size, each picture element can addressing, individually shine, by the point of picture element away from drop the order of magnitude as low as micron.
In order to reduce technical difficulty and cost, point light source can also select Mini LED, the size of the Mini LED of selection
At 100 μm or more.
The embodiment of the invention also provides a kind of display devices, including backlight module as described above.
Display device can be display, mobile phone, tablet computer, television set, wearable electronic, navigation display equipment
Deng.
The embodiment of the present invention also provides a kind of optical device, including backlight module as described above.
Further, as shown in figure 14, the optical device includes beam expanding lens 1401 and focus lamp 1402, the beam expanding lens
1401 are set between the diffraction optics film 1403 and the backlight 1404, and the focus lamp 1402 is set to the diffraction
Optical film 1403 deviates from the side of the backlight.
Beam expanding lens 1401 is for changing the diameter of light beam and the lens subassembly of the angle of divergence, to expand the angle of divergence of light
Degree.Focus lamp 1402 is for being focused the light after binary optical elements diffraction, so as to form more visible picture.This
Optical device in embodiment can be spectrometer or applied to the optical device in holographic technique.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (10)
1. a kind of backlight module characterized by comprising
Backlight；
Diffraction optics film, the diffraction optics film are used to for the light that each point light source in the backlight projects being oriented
Beam splitting forms at least two pictures.
2. backlight module according to claim 1, which is characterized in that the diffraction optics film includes one-dimensional diffraction optics member
Part, two-dimentional diffraction optical element, three dimensional diffraction optical element, Meta Materials surface or binary optical elements.
3. backlight module according to claim 1, which is characterized in that further include even smooth film, the even smooth film is set to institute
State the side that diffraction optics film deviates from the backlight.
4. backlight module according to claim 1, which is characterized in that the backlight is blue-light source.
5. backlight module according to claim 4, which is characterized in that it further include quantum dot film, the quantum dot film setting
Deviate from the side of the backlight in the diffraction optics film.
6. backlight module according to claim 5, which is characterized in that it further include at least one layer of prismatic lens, described at least one
Layer prismatic lens are set to the side that the quantum dot film deviates from the backlight.
7. backlight module according to claim 1, which is characterized in that the backlight includes multiple millis of array arrangement
Rice light emitting diode Mini LED or microdiode Micro LED.
8. a kind of display device, which is characterized in that including backlight module such as of any of claims 1-7.
9. a kind of optical device, which is characterized in that including backlight module such as of any of claims 1-7.
10. optical device according to claim 9, which is characterized in that the optical device includes beam expanding lens and focus lamp,
The beam expanding lens is set between the diffraction optics film and the backlight, and the focus lamp is set to the diffraction optics film
Away from the side of the backlight.
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| CN201811412961.8A CN109324443A (en) | 2018-11-23 | 2018-11-23 | A kind of backlight module, display device and optical device |
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| CN201811412961.8A CN109324443A (en) | 2018-11-23 | 2018-11-23 | A kind of backlight module, display device and optical device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908183A (en) * | 2019-11-12 | 2020-03-24 | 惠州市华星光电技术有限公司 | Display device |
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