CN108646466A - Backlight module, LCD display and virtual reality show the helmet - Google Patents
Backlight module, LCD display and virtual reality show the helmet Download PDFInfo
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- CN108646466A CN108646466A CN201810700319.3A CN201810700319A CN108646466A CN 108646466 A CN108646466 A CN 108646466A CN 201810700319 A CN201810700319 A CN 201810700319A CN 108646466 A CN108646466 A CN 108646466A
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- Prior art keywords
- panel
- extension panel
- plane
- light
- extension
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Classifications
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
Abstract
The present invention relates to display screen and technical field of virtual reality, and the helmet is shown in particular to a kind of backlight module, LCD display and virtual reality.The backlight module includes light source module group, the first extension panel, the second extension panel and orientation diffusion module.First extension panel has had the diffraction micro structural or holographic structure of transmission diffraction effect in the plane close to the second extension panel side, and the first extension panel extended separate second panel side plane be coated be totally reflected film layer orThe collimation or nearly collimated illumination light beam of light source module group offer are respectively after the first extension panel and the second extension panel progress vertically and horizontally are transmitted and extended, orientation diffusion module vertically and horizontally controls the emergent light beam angle of output light according to being preset in, to which the efficiency of light energy utilization of backlight module greatly improved, reduce energy consumption and reduce the generation of stray light.The LCD display and virtual reality show that the helmet includes above-mentioned backlight module.
Description
Technical field
The present invention relates to display screen and technical field of virtual reality, are shown in particular to a kind of backlight module, LCD
Screen and virtual reality show the helmet.
Background technology
The virtual content of the virtual reality display helmet, which is shown, to be mainly made of display screen and optical amplifier microscope group, normal conditions
Under, display screen is generally LCD display.The display effect of LCD display has wide viewing angle characteristics, can generally reach 160~170
Degree.When the display screen with wide viewing angle shows the helmet for virtual reality, in 30~50 degree of visual angles usually only therein
Light beam can be received by user.As shown in Figure 1, the P1 points and P2 points on LCD display only have the light light of A and B area respectively
Beam can be received by human eye.And space internal cause scattering that the light beam in remaining visual angle is constituted in display screen and optical amplifier microscope group,
Catadioptric acts on forming stray light, influences reception of the user to virtual reality content.Also, the display screen energy profit of wide viewing angle
Inefficiencies can lead to the increase of power consumption.
Invention content
In view of this, the purpose of the present invention is to provide a kind of backlight module, LCD displays with smaller visible angle
And virtual reality shows the helmet, to solve the above problems.
To achieve the above object, the present invention provides the following technical solutions：
Present pre-ferred embodiments provide a kind of backlight module, including light source module group, the first extension panel, the second expanding surface
Plate and orientation diffusion module；
The light source module group is located in the input path that described first extends panel, and the second extension panel is located at described
On the emitting light path of first extension panel, the orientation diffusion module is located on the emitting light path that described second extends panel；
The first extension panel has had transmission diffraction work in the plane S131 for extending panel side close to described second
Diffraction micro structural or holographic structure, and the first extension panel is in the plane for extending panel side far from described second
S132 be coated with total reflection film layer orWherein, β 1 is the collimation of light source module group outgoing or nearly collimation
The angle of light beam and plane S131, ns are the described first refractive index for extending material possessed by panel, plane S131 and plane
S132 is parallel；
The second extension panel has had transmission diffraction work in the plane S151 for spreading module side close to the orientation
Diffraction micro structural or holographic structure, and the second extension panel is in the plane S152 platings far from orientation diffusion module side
Have total reflection film layer orWherein, β 2 is the collimation of the first expanding surface board group outgoing or nearly collimation
The angle of light beam and plane S151, ns ' are the described second refractive index for extending material possessed by panel, plane S151 and plane
S152 is parallel；
The collimation or nearly collimated illumination light beam that the light source module group provides extend panel and second by described first respectively
Extension panel progress vertically and horizontally is transmitted and after extension, forms collimation angle pencil of ray or closely collimate angle pencil of ray, institute
Orientation diffusion module is stated according to the emergent light beam angle for being preset in vertically and horizontally control output light.
Optionally, the plane S131 of the first extension panel is divided into multiple regions in the Y direction, the plane S131's
The transmission potential in each region tends to be identical, and the transmission potential of all areas of the plane S131 and tend to light source module group
Outgoing total light energy and the plane S131 each region reflectivity and transmittance and be 1.
Optionally, the first extension panel for being extended incident beam in the Y direction, the second extension panel
For being extended in X-direction to incident beam, then W=2*H*COS β 1；
Wherein, W is light source module group along the beam size on the direction vertical with light beam incident direction；H is the first extension
Spacing between the lower planes of panel along the X direction；β 1 is that the parallel or close collimated light beam of light source module group output and first are expanded
The angle of the plane S131 of developable surface plate.
Optionally, it is described first extension panel vertical direction control output light emergent light beam angle be 0 ° to 30 ° it
Between, it is described second extension panel control in the horizontal direction output light emergent light beam angle be 0 ° to 30 ° between.
Optionally, it is described first extension panel vertical direction control output light emergent light beam angle be 0 ° to 20 ° it
Between, it is described second extension panel control in the horizontal direction output light emergent light beam angle be 0 ° to 40 ° between.
Optionally, the orientation diffusion module is bidirectional oriented diffusion barrier, or is orthogonally located bicylinder lens array,
Or it is orthogonally located unidirectional orientation diffusion barrier.
Optionally, the orientation diffusion module fits with the second extension panel.
Another preferred embodiment of the present invention provides a kind of LCD display, including liquid crystal display panel and above-mentioned backlight module.
Optionally, the liquid crystal display panel, orientation diffusion module and the second extension panel are bonded to each other.
Another preferred embodiment of the present invention provides a kind of virtual reality display helmet, including above-mentioned LCD display.
The backlight module that present pre-ferred embodiments provide passes through to light source module group, the first extension panel, the second expanding surface
The integrated and design of plate and orientation diffusion module, the light that light source module group is exported using the first extension panel and the second extension panel
The extension of Shu Jinhang vertically and horizontally beam sizes of both direction, therefore light source module group is without exporting collimation angle pencil of ray or close accurate
Straight angle pencil of ray so that the optical system structure of light source module group is simpler, meanwhile, output light is controlled using orientation diffusion module
Emergent light beam angle is smaller, to which the efficiency of light energy utilization of backlight module greatly improved, reduce energy consumption and reduce the generation of stray light.
The LCD display and virtual reality that present pre-ferred embodiments provide show that the helmet includes above-mentioned backlight module, because
And there is similar advantageous effect.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described.It should be appreciated that the following drawings illustrates only certain embodiments of the present invention, therefore it is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the wide viewing angle display schematic diagram for the display screen that existing virtual reality shows the helmet.
Fig. 2 is a kind of structural schematic diagram for backlight module that present pre-ferred embodiments provide.
Fig. 3 is a kind of structural schematic diagram for light source module group that present pre-ferred embodiments provide.
Fig. 4 is the structural schematic diagram for another light source module group that present pre-ferred embodiments provide.
Fig. 5 is the schematic diagram that the first extension panel shown in Fig. 2 is transmitted light and extends.
Fig. 6 is the schematic diagram that the second extension panel shown in Fig. 2 is transmitted light and extends.
Fig. 7 is that subregional number is schemed in the Y direction by the plane S131 of the first extension panel.
Fig. 8 is that the angle β 3 between the plane of incidence S323 of the second extension panel and its plane S321 is notSignal
Figure.
When Fig. 9 is that the first extension panel is unsatisfactory for condition, there are the schematic diagrames of no light zone between the light beam of output.
When Figure 10 is that the first extension panel is unsatisfactory for condition, there are the schematic diagrames of overlay region between the light beam of output.
Figure 11 is a kind of structural schematic diagram for LCD display that present pre-ferred embodiments provide.
Icon:10- backlight modules；11- light source module groups；13- first extends panel；15- second extends panel；17- is oriented
Spread module；111- lighting sources；113- beam shaping bundling devices；1111- red LED light sources；1112- green LED light sources；
1113- blue led light sources；1131- collimator and extender shaping components；1133- combined beam units；11311- the first collimator and extender shaping lists
Member；11312- the second collimator and extender shaping units；11313- third collimator and extender shaping units；114- light emitting units；115-
Optical collimator；116- combiner devices；117- couples optical fiber；118- collimates microscope group；119- dissipation spot devices；1-LCD display screens；
19- liquid crystal display panels.
Specific implementation mode
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 describes.Obviously, described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment of the present invention, people in the art
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.In description of the invention
In, term " first ", " second ", " third ", " the 4th " etc. are only used for distinguishing description, and should not be understood as only or imply opposite
Importance.
Referring to FIG. 2, Fig. 2 is a kind of schematic diagram for backlight module 10 that present pre-ferred embodiments provide.Such as Fig. 2 institutes
Show, the backlight module 10 includes：Light source module group 11, first extends panel 13, second and extends panel 15 and orientation diffusion module
17。
Light source module group 11 is located in the input path of the first extension panel 13, is that the first extension panel 13 provides collimation or close
Collimated illumination light beam.Light source module group 11 can be mainly by LED (Light Emitting Diode light emitting diodes) light sources or LD
(Laser Diode laser diodes) light source is constituted with collimation lens set, can also be mainly by optical fiber source and collimation lens set
It constitutes.
For example, as shown in figure 3, when light source module group 11 is mainly by LED (Light Emitting Diode light emitting diodes)
When light source is constituted with collimation lens set, light source module group 11 may include lighting source 111 and beam shaping bundling device 113.Illumination
Laser light source, LED light source etc. may be used in light source 111.Optionally, in the present embodiment, which is LED light
Source, the LED light source may include red LED light source 1111, green LED light source 1112 and blue led light source 1113.In another reality
It applies in mode, the color of each LED can be configured according to actual needs in LED light source, to meet the needs of actual conditions,
It is not limited herein.Beam shaping bundling device 113 is set in the light path of lighting source 111, for being sent out to lighting source 111
Light beam carry out collimator and extender shaping, close beam processing.Optionally, in the present embodiment, beam shaping bundling device 113 includes standard
Direct expansion beam shaping component 1131 and combined beam unit 1133.Collimator and extender shaping component 1131 includes the first collimator and extender shaping unit
11311, the second collimator and extender shaping unit 11312 and third collimator and extender shaping unit 11313.Wherein, the first collimator and extender
Shaping unit 11311 is used to carry out collimator and extender Shape correction to the light beam that red LED light source 1111 is sent out.Second collimator and extender
Shaping unit 11312 is used to carry out collimator and extender Shape correction to the light beam that green LED light source 1112 is sent out.Third collimator and extender
Shaping unit 11313 is used to carry out collimator and extender Shape correction to the light beam that blue led light source 1113 is sent out.Under normal conditions,
First collimator and extender shaping unit 11311, the second collimator and extender shaping unit 11312 and third collimator and extender shaping unit
11313 alignment precision may be required in several milliradians.Combined beam unit 1133 will be for that will pass through the first collimator and extender shaping list
First 11311, second collimator and extender shaping unit 11312 and 11313 collimator and extender Shape correction of third collimator and extender shaping unit
Light beam afterwards synthesizes single beam.Optionally, combined beam unit 1133 is x-cube type light-combining prisms.
For example, as shown in figure 4, when light source module group 11 is mainly made of optical fiber source and collimation lens set, light source module group
11 may include light emitting unit 114, optical collimator 115, combiner device 116, coupling optical fiber 117 and collimation microscope group 118.Light is sent out
It penetrates unit 114 and laser light source, LED light source etc. may be used.Optionally, in the present embodiment, which swashs for LD
Radiant, such as generating device of laser.The laser beam emitting device can wrap fast red laser transmitter unit, green laser transmitter unit
With blue laser light emission unit.In other embodiments, the color of each laser emission element can be in generating device of laser
It is configured, to meet the needs of actual conditions, is not limited herein according to actual needs.Optical collimator 115 can select public affairs
Know in technology to be optical collimation lens, the angle of divergence for reducing the light beam emitted by generating device of laser.Combiner device 116
The light-combining prism in known technology can be selected, is not illustrated herein.It can be multimode fibre or single mode to couple optical fiber 117
Optical fiber.The input terminal of coupling optical fiber 117 can melt globe lens, the laser beam that can be coupled for increasing coupling optical fiber 117
Bore so that the combined beam light beam after combiner device 116 is easy to be coupled into coupling optical fiber 117.Couple the defeated of optical fiber 117
Outlet can process tapered, and the waist radius for reducing output end outgoing beam increases the numerical aperture of outgoing beam, makes
The light beam that optical fiber 117 exports the big angle of emergence of small light spot must be coupled.Collimate the small light that microscope group 118 is used to export coupling optical fiber 117
The light beam of the big angle of emergence of spot is collimated, to obtain the preferable collimated light beam of directionality or nearly collimated light beam.Under normal conditions, it passes through
After crossing collimation microscope group 118, collimated light beam or nearly collimated light beam of the shooting angle within the scope of 0 °~0.5 ° can be obtained.Specific
In implementation, the with a tight waist focal plane position for being located at collimation microscope group 118 of light beam that setting coupling optical fiber 117 exports or nearby, thus
Obtain collimated light beam or nearly collimated light beam.When light emitting unit 114 is laser light source, light source module group 11 can also include dissipating
Spot device 119.Dissipation spot device 119 by change laser instantaneous phase to interfere the coherence of laser beam, to cut
Speckle effect existing for weak laser so that the beam energy that light source module group 11 provides is more evenly distributed.Dissipation spot device 119 can be with
The liquid crystal phase modulator or vibration phase plate in known technology are selected, is not limited herein.
First extension panel 13 for being extended the light beam transmitted from light source module group 11 in the Y direction.Second expanding surface
Plate 15 is used to be extended the light beam transmitted from the first extension panel 13 in X-direction.Finally, light source module group 11 is by the first extension
It is to collimate or closely collimate angle pencil of ray that panel 13 and second, which extends 15 co-extensive of panel,.
It is respectively the tablet made with certain refraction materials that first extension panel 13 and second, which extends panel 15,.Such as figure
Shown in 5, the first extension panel 13 has diffraction micro structural, the diffraction micro- in the plane S131 close to the second 15 side of extension panel
Structure has transmission diffraction effect to incident beam.First extension panel 13 is in the plane far from the second 15 side of extension panel
S132 can be coated with total reflection film layer, and β 1, which can also be arranged, makes it meet condition：Wherein β 1 is light source
The angle of collimation or nearly collimated light beam and plane S131 that module 11 is emitted, i.e. incidence angle；Ns is had by the first extension panel 13
The refractive index of some materials.Plane S131 is parallel with plane S132.Similarly, as shown in fig. 6, the second extension panel 15 is close to fixed
To the plane S151 of 17 side of diffusion module there is diffraction micro structural, the diffraction micro structural to make with transmission diffraction to incident beam
With.Second extension panel 15 can be coated with total reflection film layer in the plane S152 far from 17 side of orientation diffusion module, can also
Setting β 2 makes it meet condition：β 2 is the collimation of first extension 13 groups of outgoing of panel or nearly collimated light
The angle of beam and plane S151, i.e. incidence angle；Wherein, ns ' is the refractive index of material possessed by the second extension panel 15.Plane
S151 is parallel with plane S152.
Due to second extension panel 15 with first extension panel 13 it is similar or identical, for saving length, below only with
It illustrates, has for the second extension panel 15 same or analogous with the first extension panel 13 for first extension panel 13
Conclusion.
As shown in fig. 7, there is the plane S131 of the first extension panel 13 different transmission diffractions to imitate for subregion in the Y direction
Rate and zero order reflection diffraction efficiency.First region close to 11 side of light source module group is denoted as part1, along Y negative direction sequences
Remember each region be respectively part2, part3 ..., parti ... ..., and be by the reflection diffraction efficiency in arti region of pth
Ri, transmission diffraction efficiency Dti, does not consider absorption loss herein, and the transmission potential that can release arti region of pth is Ei=R1*
R2* ... * Ri-1*Dti*E, wherein E are the total light energy being emitted from light source module group 11, to make the first extension panel 13 be emitted
Light beam obtain higher uniformity and higher capacity usage ratio, the reflection diffraction efficiency and transmission diffraction efficiency of multiple regions
Following condition need to be met：
Ei-Ej → 0, i ≠ j, i=1：N, j=1：n (1)
Dti+Ri=1, i=1：n (3)
Wherein, n indicates a total of n region in the Y direction plane S131 of the first extension panel 13.
That is, the transmission potential of each subregion of the plane S131 of the first extension panel 13 tends to be identical, and described the
One extension panel 13 plane S131 transmission potential and tend to light source module group 11 outgoing total light energy and plane S131
Each subregion reflectivity and transmittance and be 1.
Referring to Fig. 6, when the angle between the plane of incidence S153 and its plane S151 of the second extension panel 15 isWhen, and from first extension panel 13 be emitted light beam with extension panel S131 it is vertical when, first extend panel 13
Exit plane S131 it is parallel with the second extension plane of incidence S153 of panel 15, and can have a gap or two between the two
Person is bonded.
As shown in figure 8, when the angle β 3 between the plane of incidence S323 and its plane S321 of the second extension panel 15 is notWhen, but from first extension panel 13 be emitted light beam it is vertical with plane S131 when, first extend panel 13 exit plane
There is an angle beta 4 between the plane of incidence S153 of the extension panels 15 of S131 and second,
Ns ' is had the refractive index of material by the second extension panel 15.
Referring to Fig. 5, as W=2*H*COS (β 1), after the first extension panel 13 extends the light beam that exports have compared with
High optical uniformity and be not in light beam saltus step.Wherein, W is light source module group 11 along the direction vertical with light beam incident direction
On beam size；H is the spacing between the lower planes of the first extension panel 13 along the X direction；β 1 is that light source module group 11 is defeated
The angle of the plane S131 of the parallel or close collimated light beam gone out and the first extension panel 13.
As shown in figure 9, working as W<When 2*H*COS (β 1), the parallel or close collimated light beam that the first extension panel 13 exports occurs
Continuous light energy saltus step, region shown in B1 are beam exit area, and region shown in B2 is no light zone.
As shown in Figure 10, work as W>When 2*H*COS (β 1), the parallel or close collimated light beam that the first extension panel 13 exports occurs
Continuous light energy overlay region, region shown in B3 are beam exit area, and region shown in B4 is light beam overlay region.In this overlay region meeting
There is the increase of light energy, the final uniformity for influencing output beam.
Above in addition to diffraction micro structural, holographic structure can also be.That is, the first extension panel 13 is close to the second expanding surface
The extension panels 15 of the plane S131 of 15 side of plate and second are in the plane S151 by 17 side of near orientation diffusion module in addition to having
Outside diffraction micro structural, holographic structure can also be.
Orientation diffusion module 17 is arranged on the emitting light path of the second extension panel 15, to have specific angle to incident beam
Spend the optical film material of diffusion.Orientation diffusion module 17 is for expanding outgoing beam in two mutually orthogonal directions
It dissipating, emergent ray is after orientation diffusion module 17 is spread, between the diffusion angle in vertical direction Y-direction is 0 ° to 30 °,
The diffusion angle in X-direction is 0 ° to 30 ° in the horizontal direction, can also be that diffusion angle in two directions is different, e.g.,
It is bigger in vertical direction Y motion range than pupil in horizontal X direction motion range for pupil of human, orientation diffusion module can be set
17 diffusion angle in vertical direction Y-direction be 0 ° to 20 °, while in the horizontal direction the diffusion angle in X-direction be 0 ° extremely
40°.Orientation spreads the bicylinder lens array or bidirectional oriented diffusion barrier or orthogonally located that module 17 can be orthogonally located
Unidirectional orientation diffusion barrier.Unidirectional orientation diffusion barrier can be had on film substrate in certain fractions distribution or sequence
It is placed with the film of microtrabeculae lens arrangement, the semicircle bulb diameter of microlens structure can be between a few micrometers to hundred microns.It is two-way
Orientation diffusion barrier is usually the film that there is in certain fractions distribution or sequence to be placed with microlens structure on film substrate,
The semicircle bulb diameter of microlens structure can be between a few micrometers to hundred microns.
In order to reduce volume, orientation diffusion module 17 can be bonded with the second extension panel 15.
The backlight module 10 that present pre-ferred embodiments provide to light source module group 11, first by extending panel 13, second
The integrated and design for extending panel 15 and orientation diffusion module 17 extends panel 15 to light using the first extension panel 13 and second
The light beam that source module 11 exports carries out the extension of the vertically and horizontally beam size of both direction, therefore light source module group 11 is without defeated
Going out to collimate angle pencil of ray or closely collimates angle pencil of ray so that the optical system structure of light source module group 11 is simpler, meanwhile, expanded using orientation
The emergent light beam angle for dissipating the control output light of module 17 is smaller, to which the efficiency of light energy utilization, the drop of backlight module 10 greatly improved
Low energy consumption and the generation for reducing stray light.
Please refer to Fig.1 1, another preferred embodiment of the present invention also provides a kind of LCD display 1, including liquid crystal display panel 19 and
Above-mentioned backlight module 10.
Liquid crystal display panel 19 is usually made of polaroid, colored filter, liquid crystal molecule, thin film transistor (TFT), polaroid.
In order to reduce volume, liquid crystal display panel 19, orientation diffusion module 17 and second extend panel 15 can two-by-two or three
It is bonded to each other.
The LCD display 1 that present pre-ferred embodiments provide includes above-mentioned backlight module 10, thus with similar beneficial
Effect.
LCD display 1 provided in an embodiment of the present invention can be applied in the lower occasion of field angle to LCD display 1.
For example, virtual reality shows that the LCD display 1 in the helmet does not need higher field angle, thus the LCD display 1 can answer
The helmet is shown for virtual reality.
Therefore, another preferred embodiment of the present invention also provides a kind of virtual reality display helmet, including above-mentioned LCD is shown
Screen 1.
The virtual reality that present pre-ferred embodiments provide shows that the helmet includes above-mentioned LCD display 1, thus with similar
Advantageous effect, that is, improve the efficiency of light energy utilization, reduce energy consumption and reduce stray light generation.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of backlight module, which is characterized in that expand including light source module group, the first extension panel, the second extension panel and orientation
Dissipate module；
The light source module group is located in the input path that described first extends panel, and the second extension panel is located at described first
On the emitting light path for extending panel, the orientation diffusion module is located on the emitting light path that described second extends panel；
The first extension panel has had transmission diffraction effect in the plane S131 for extending panel side close to described second
Diffraction micro structural or holographic structure, and the first extension panel is in the plane S132 platings for extending panel side far from described second
Have total reflection film layer orWherein, β 1 is the collimation or nearly collimated light beam and put down that the light source module group is emitted
The angle of face S131, ns are the described first refractive index for extending material possessed by panel, and plane S131 is parallel with plane S132；
The second extension panel has had transmission diffraction effect in the plane S151 for spreading module side close to the orientation
Diffraction micro structural or holographic structure, and the second extension panel is in the plane S152 platings for spreading module side far from the orientation
Have total reflection film layer orWherein, β 2 is the collimation of the first expanding surface board group outgoing or nearly collimation
The angle of light beam and plane S151, ns ' are the described second refractive index for extending material possessed by panel, plane S151 and plane
S152 is parallel；
The collimation or nearly collimated illumination light beam that the light source module group provides extend panel and the second extension by described first respectively
Panel progress vertically and horizontally is transmitted and after extension, forms collimation angle pencil of ray or closely collimate angle pencil of ray, described fixed
To diffusion module according to the emergent light beam angle for being preset in vertically and horizontally control output light.
2. backlight module according to claim 1, which is characterized in that the plane S131 of the first extension panel is in the side Y
To multiple regions are divided into, the transmission potential in each region of the plane S131 tends to be identical, and the institute of the plane S131
Have the transmission potential in region and tending to each region of total light energy and the plane S131 that light source module group is emitted anti-
Penetrate than with transmittance and be 1.
3. backlight module according to claim 1, which is characterized in that the first extension panel is for existing to incident beam
Y-direction is extended, and the second extension panel is used to be extended incident beam in X-direction, then W=2*H*COS β 1；
Wherein, W is light source module group along the beam size on the direction vertical with light beam incident direction；H is the first extension panel
The spacing between lower planes along the X direction；β 1 is the parallel or close collimated light beam and the first expanding surface of light source module group output
The angle of the plane S131 of plate.
4. backlight module according to claim 1, which is characterized in that the first extension panel controls defeated in vertical direction
Between the emergent light beam angle for going out light is 0 ° to 30 °, the second extension panel controls the outgoing of output light in the horizontal direction
Between beam angle is 0 ° to 30 °.
5. backlight module according to claim 1, which is characterized in that the first extension panel controls defeated in vertical direction
Between the emergent light beam angle for going out light is 0 ° to 20 °, the second extension panel controls the outgoing of output light in the horizontal direction
Between beam angle is 0 ° to 40 °.
6. according to claim 1-5 any one of them backlight modules, which is characterized in that the orientation diffusion module is two-way fixed
To diffusion barrier, or it is orthogonally located bicylinder lens array, or is orthogonally located unidirectional orientation diffusion barrier.
7. according to claim 1-5 any one of them backlight modules, which is characterized in that the orientation diffusion module and second expands
Developable surface plate fits.
8. a kind of LCD display, which is characterized in that including liquid crystal display panel and claim 1-7 any one of them backlight modules.
9. LCD display according to claim 8, which is characterized in that the liquid crystal display panel, orientation spread module and second
Extension panel is bonded to each other.
10. a kind of virtual reality shows the helmet, which is characterized in that including LCD display according to any one of claims 8.
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| CN201810700319.3A CN108646466A (en) | 2018-06-29 | 2018-06-29 | Backlight module, LCD display and virtual reality show the helmet |
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| CN201810700319.3A CN108646466A (en) | 2018-06-29 | 2018-06-29 | Backlight module, LCD display and virtual reality show the helmet |
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| CN108646466A true CN108646466A (en) | 2018-10-12 |
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| CN201810700319.3A Pending CN108646466A (en) | 2018-06-29 | 2018-06-29 | Backlight module, LCD display and virtual reality show the helmet |
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