CN108224367A - Light source switching mechanism and display device - Google Patents
Light source switching mechanism and display device Download PDFInfo
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- CN108224367A CN108224367A CN201810186881.9A CN201810186881A CN108224367A CN 108224367 A CN108224367 A CN 108224367A CN 201810186881 A CN201810186881 A CN 201810186881A CN 108224367 A CN108224367 A CN 108224367A
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- light source
- diffraction lens
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- liquid crystal
- lens unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/003—Controlling the distribution of the light emitted by adjustment of elements by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
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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
- G02F1/1313—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 specially adapted for a particular application
-
- 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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The disclosure provides a kind of light source switching mechanism and display device, is related to display technology field.The light source switching mechanism includes backlight module and light source handover module;Light source handover module includes the first diffraction lens unit and the second diffraction lens unit, and lens stop therebetween, first diffraction lens unit is located at far from backlight module, lens stop at the object space focal plane of the second diffraction lens unit close to backlight module, the second diffraction lens unit;Under first light source state, lens stop forms multiple apertures, and the first diffraction lens unit focuses to the light that backlight module is sent out at the aperture of lens stop, and the light beam regulation being emitted from the aperture of lens stop is collimated light beam by the second diffraction lens unit;Under second light source state, the light that lens stop, the first diffraction lens unit and the second diffraction lens unit control backlight module to send out is directed through.The disclosure can realize the switching between scattering backlight and collimated back, moreover it is possible to promote the collimating effect of outgoing beam.
Description
Technical field
This disclosure relates to display technology field more particularly to a kind of light source switching mechanism and include the light source switching mechanism
Display device.
Background technology
Fig. 1 diagrammatically illustrates the collimated back technical schematic diagram based on dot matrix backlight.Wherein, the array light of backlight module
Source 01 can be placed on the object space focal plane of collimator lens array, so that each array light source 01 can be fallen in collimator lens array respectively
In the object focus of lens unit 02, so as to fulfill the beam collimation in the range of lens aperture.
But the collimated back technology has the disadvantage that:First, device function is relatively single;Second, plano-convex singlet lens
Spherical aberration it is larger, it is thus possible to influence light extraction collimation;Third, each lens unit can only control the small divergence angle light in aperture
Beam collimates, and the light beam outside aperture can pass through adjacent lens unit, so as to seriously affect the collimating effect of device entirety.
It should be noted that information is only used for strengthening the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore can include not forming the information to the prior art known to persons of ordinary skill in the art.
Invention content
The disclosure is designed to provide a kind of light source switching mechanism and display device, for solving the existing collimation back of the body
The function of optical device is single and the problem of light extraction collimating effect is bad.
Other characteristics and advantages of the disclosure will be by the following detailed description apparent from or partially by the disclosure
Practice and acquistion.
According to one aspect of the disclosure, a kind of light source switching mechanism is provided, including backlight module and positioned at the back of the body
The light source handover module of optical mode group light emission side;
The light source handover module include the first diffraction lens unit and the second diffraction lens unit and positioned at the two it
Between lens stop, the first diffraction lens unit sets close to the backlight module, and the second diffraction lens unit is remote
It is set from the backlight module, and the lens stop is located at the object space focal plane of the second diffraction lens unit;
Under first light source state, the lens stop is used to form multiple apertures of array arrangement, first diffraction
Lens unit is for focusing to the light that the backlight module is sent out at the aperture of the lens stop, second diffraction lens
It is collimated light beam that unit, which is used for the light beam regulation being emitted from the aperture of the lens stop,;
Under second light source state, the lens stop, the first diffraction lens unit and second diffraction lens
The light that unit is used to that the backlight module is controlled to send out is directed through.
In a kind of exemplary embodiment of the disclosure, the axis in the aperture of the lens stop, first diffraction lens
The optical axis of the optical axis of unit and the second diffraction lens unit coincides.
In a kind of exemplary embodiment of the disclosure, the backlight module includes multiple luminous lists in dot matrix distribution
Member, the light source handover module include the multiple light sources switch unit of array arrangement, the multiple luminescence unit with it is the multiple
Light source switch unit is arranged in a one-to-one correspondence.
In a kind of exemplary embodiment of the disclosure, the first diffraction lens unit includes:
The first substrate and second substrate being oppositely arranged;
The first liquid crystal layer between the first substrate and the second substrate;
With adjacent first diffraction lens of first liquid crystal layer;
Positioned at first liquid crystal layer close to the first electrode of the first substrate side;
Positioned at first liquid crystal layer close to the second substrate side and the second electrode of mutually insulated and third electrode;
And deviate from the first polaroid of the first liquid crystal layer side positioned at the first substrate;
Wherein, first liquid crystal layer has first refractive index under the first light source state, in the second light source
There is the second refractive index, and second refractive index is identical with the refractive index of first diffraction lens under state.
In a kind of exemplary embodiment of the disclosure, the lens stop includes:
The third substrate and tetrabasal being oppositely arranged;
The second liquid crystal layer between the third substrate and the tetrabasal;
Positioned at second liquid crystal layer close to the 4th electrode of the third substrate side;
Positioned at second liquid crystal layer close to the 5th electrode of the tetrabasal side;
And deviate from the second polaroid of the second liquid crystal layer side positioned at the 4th electrode;
Wherein, the third substrate is between the first substrate and the tetrabasal.
In a kind of exemplary embodiment of the disclosure, the second diffraction lens unit includes:
The 5th substrate being oppositely arranged and the 6th substrate;
Third liquid crystal layer between the 5th substrate and the 6th substrate;
With adjacent second diffraction lens of the third liquid crystal layer;
Positioned at the third liquid crystal layer close to the 5th substrate side and the 6th electrode of mutually insulated;With the 7th electricity
Pole;
And positioned at the third liquid crystal layer close to the 8th electrode of the 6th substrate side;
Wherein, the third liquid crystal layer has third reflect rate under the first light source state, in the second light source
There is fourth refractive index, and the fourth refractive index is identical with the refractive index of second diffraction lens under state.
In a kind of exemplary embodiment of the disclosure, the second substrate is same substrate with the third substrate.
In a kind of exemplary embodiment of the disclosure, the between axlemolecules of first polaroid are saturating with second polaroid
Axis is crossed to be mutually perpendicular to.
In a kind of exemplary embodiment of the disclosure, the refractive index of first diffraction lens and second diffraction lens
Refractive index be all higher than 1.7.
According to one aspect of the disclosure, a kind of display device is provided, which is characterized in that switch dress including above-mentioned light source
It puts.
Light source switching mechanism and display device that disclosure illustrative embodiments are provided, it can be achieved that scattering backlight with
Switching between collimated back.On the one hand, multiple apertures of array arrangement are formed in lens stop for use as aperture diaphragm and the
When one diffraction lens unit and the second diffraction lens unit are both used as condenser lens, the light beam that backlight module is sent out will be by first
Diffraction lens unit is focused at each aperture of lens stop, and from each aperture be emitted focus on light beam again through the second diffraction
Lens unit will be adjusted to collimated light beam, so as to obtain collimated light source back lighting device;On the other hand, in lens stop,
When one diffraction lens unit and the second diffraction lens unit are both used as plate glass, the light beam that backlight module is sent out will be worn successively
The first diffraction lens unit, lens stop, the second diffraction lens unit are crossed, so as to obtain scattering light source back lighting device.Based on this,
The forming method of middle collimated light compared with the prior art, since this example embodiment is when forming collimated light source, backlight module
The light sent out can first be focused to aperture diaphragm and then be adjusted to collimated light beam, therefore can effectively reduce spherical aberration to outgoing
The influence of beam collimation degree, and lens stop can also eliminate the uncollimated rays other than aperture, so as to be obviously improved out
The collimating effect of irradiating light beam.
It should be understood that above general description and following detailed description are only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
Attached drawing herein is incorporated into specification and forms the part of this specification, shows the implementation for meeting the disclosure
Example, and for explaining the principle of the disclosure together with specification.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 schematically shows the collimated back technical schematic diagram based on dot matrix backlight in the prior art;
Fig. 2 schematically shows the structure diagram of light source switching mechanism in disclosure exemplary embodiment;
Fig. 3 schematically shows collimation light extraction schematic diagram in disclosure exemplary embodiment;
Fig. 4 schematically shows the concrete structure schematic diagram of light source switching mechanism in disclosure exemplary embodiment;
Fig. 5 schematically shows the parameter-relation chart of collimated light path in disclosure exemplary embodiment;
Fig. 6 schematically shows the structure diagram of diffraction lens in disclosure exemplary embodiment.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein;On the contrary, these embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be in any suitable manner incorporated in one or more embodiments.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.Identical attached drawing mark in figure
Note represents same or similar part, thus will omit repetition thereof.Attached some block diagrams shown in figure are work(
Can entity, not necessarily must be corresponding with physically or logically independent entity.Software form may be used to realize these work(
Entity or these functional entitys can be realized in one or more hardware modules or integrated circuit or at heterogeneous networks and/or place
These functional entitys are realized in reason device device and/or microcontroller device.
This example embodiment provides a kind of light source switching mechanism, it can be achieved that cutting between scattering backlight and collimated back
It changes.As shown in Fig. 2, the light source switching mechanism can include backlight module 10 and multiple light positioned at 10 light emission side of backlight module
Source handover module 20.The light source handover module 20 includes the first diffraction lens unit 21 and the second diffraction lens unit 22, with
And lens stop 23 positioned there between, the first diffraction lens unit 21 are set close to backlight module 10, the second diffraction lens
Unit 22 is set far from backlight module 10, and lens stop 23 is located at the object space focal plane of the second diffraction lens module 22.
Under first light source state, lens stop 23 can be used to form multiple apertures 230 of array arrangement, and the first diffraction is saturating
Mirror unit 21 can be used for focusing to the light that backlight module 10 is sent out at the aperture 230 of lens stop 23, the second diffraction lens list
It is collimated light beam that member 22, which can be used for the light beam regulation being emitted from the aperture of lens stop 23,.
Under second light source state, lens stop 23, the first diffraction lens unit 21 and the second diffraction lens unit 22 are
Plate glass can be equivalent to, be directed through for the light that control backlight module 10 is sent out and scatters outgoing.
Wherein, lens stop 23 can realize the switching between aperture diaphragm function and plate glass function, and the first diffraction
The switching between focus lens function and plate glass function can be achieved in 21 and second diffraction lens unit 22 of lens unit.
The light source switching mechanism that disclosure illustrative embodiments are provided is, it can be achieved that between scattering backlight and collimated back
Switching.On the one hand, as shown in figure 3, lens stop 23 formed array arrangement multiple apertures 230 for use as aperture diaphragm,
And first diffraction lens unit 21 and the second diffraction lens unit 22 when being both used as condenser lens, the light beam that backlight module 10 is sent out
It will be focused at each aperture 230 of lens stop 23 by the first diffraction lens unit 21, and be emitted from each aperture 230
Focus on light beam will be adjusted to collimated light beam through the second diffraction lens unit 22 again, so as to obtain collimated light source back lighting device;
On the other hand, when lens stop 23, the first diffraction lens unit 21 and the second diffraction lens unit 22 are both used as plate glass,
The light beam that backlight module 10 is sent out will sequentially pass through the first diffraction lens unit 21, lens stop 23, the second diffraction lens list
Member 22, so as to obtain scattering light source back lighting device.Based on this, the forming method of middle collimated light compared with the prior art, due to this
When forming collimated light source, light that backlight module 10 is sent out can first be focused to aperture diaphragm and then be conditioned example embodiment
For collimated light beam, therefore it can effectively reduce influence of the spherical aberration to outgoing beam collimation, and lens stop 23 can also be eliminated
Uncollimated rays other than aperture 230, so as to be obviously improved the collimating effect of outgoing beam.
The precision and the collimating effect of emergent light focused in view of light beam, this example embodiment preferred lens diaphragm
The optical axis of the axis in 23 aperture 230, the optical axis of the first diffraction lens unit 21 and the second diffraction lens unit 22 coincides.
The concrete structure of the light source switching mechanism is described in detail with reference to Fig. 4.Wherein, the first diffraction is saturating
The function of mirror unit 21, the second diffraction lens unit 22 and lens stop 23 under different light source states can pass through liquid
The state of brilliant control device switches to realize.The backlight module 10 can include multiple luminescence units in dot matrix distribution
100, the light source handover module 20 can include the multiple light sources switch unit 230 of array arrangement, then multiple luminescence units 100
It is arranged in a one-to-one correspondence with multiple light sources switch unit 230.On this basis, backlight module 10 can also include luminous for carrying
The underlay substrate 101 of unit 100 and the package substrate 102 for packaging light-emitting unit 100, luminescence unit 100 therein can
Think OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) array light source or micro
LED (micro Light Emitting Diode, micro- light emitting diode) array light sources or can also be other forms point
Array light source is here not construed as limiting this.
Optionally, the first diffraction lens unit 21 can include:The first substrate 211 and second substrate being oppositely arranged
212 and the first liquid crystal layer 213 therebetween;With 213 adjacent first diffraction lens 214 of the first liquid crystal layer, this first spreads out
Lens 214 are penetrated close to 211 side of first substrate and convex surface towards the first liquid crystal layer 213;Positioned at the first liquid crystal layer 213 close to first
The first electrode 215 of 211 side of substrate, the first electrode 215 can be plate electrode;Positioned at the first liquid crystal layer 213 close to
Two substrates, 212 side and the second electrode 216 of mutually insulated and third electrode 217, second electrode 216 and third electrode 217 it
Between the first insulating layer 218 can be set, and it can be to prolong along Y-direction that second electrode 216, which can be plate electrode, third electrode 217,
The strip shaped electric poles stretched;Deviate from the first polaroid 219 of 213 side of the first liquid crystal layer, first polaroid positioned at first substrate 211
219 light transmission axis direction for example can be X-direction.
Wherein, the first liquid crystal layer 213 can have first refractive index, that is, low-refraction under first light source state, in the second light
There can be the second refractive index, that is, high refractive index under the state of source, and the second refractive index should be with the refractive index phase of the first diffraction lens 214
Together, and the refractive index of the first diffraction lens 214 is preferably greater than 1.7.
Based on this, under first light source state, by powering, first electrode 215 and second electrode 216 to third electrode
217 power-off, you can control liquid crystal molecule deflects and is in first refractive index state such as low-refraction relative to incident polarized light
State, at this time the first diffraction lens unit 21 can be equivalent to condenser lens;Under second light source state, by second electrode
216 and third electrode 217 power, first electrode 215 powered off, you can control liquid crystal molecule deflection and relative to incident polarized light
In the second refractive index state such as high refractive index state, at this time since the second refractive index of the first liquid crystal layer 213 is spread out with first
The refractive index for penetrating lens 214 is identical, therefore the first diffraction lens unit 21 can be equivalent to plate glass.
Optionally, the second diffraction lens unit 22 can include:The 5th substrate 221 being oppositely arranged and the 6th substrate
222 and third liquid crystal layer 223 therebetween;With 223 adjacent second diffraction lens 224 of third liquid crystal layer, this second spreads out
Lens 224 are penetrated close to 222 side of the 6th substrate and convex surface towards third liquid crystal layer 223;Positioned at third liquid crystal layer 223 close to the 5th
221 side of substrate and the 6th electrode 225 and the 7th electrode 226 of mutually insulated, between the 6th electrode 225 and the 7th electrode 226
Second insulating layer 227 can be set, and it can be to extend in X direction that the 6th electrode 225, which can be plate electrode, the 7th electrode 226,
Strip shaped electric poles;And positioned at third liquid crystal layer 223 close to the 8th electrode 228 of 222 side of the 6th substrate, the 8th electrode
228 can be plate electrode.
Wherein, third liquid crystal layer 223 can have third reflect rate, that is, low-refraction under first light source state, in the second light
There can be fourth refractive index, that is, high refractive index under the state of source, and fourth refractive index should be with the refractive index phase of the second diffraction lens 224
Together, and the refractive index of the second diffraction lens 224 is preferably greater than 1.7.
Based on this, under first light source state, by powering, the 6th electrode 225 and the 8th electrode 228 to the 7th electrode
226 power-off, you can control liquid crystal molecule deflects and is in third reflect rate state such as low-refraction relative to incident polarized light
State, at this time the second diffraction lens unit 22 can be equivalent to condenser lens;Under second light source state, by the 6th electrode
225 and the 7th electrode 226 power, the 8th electrode 228 powered off, you can control liquid crystal molecule deflection and relative to incident polarized light
In fourth refractive index state such as high refractive index state, at this time since the fourth refractive index of third liquid crystal layer 223 is spread out with second
The refractive index for penetrating lens 224 is identical, therefore the second diffraction lens unit 22 can be equivalent to plate glass.
Optionally, the lens stop 23 can include:The third substrate 231 and tetrabasal 232 that are oppositely arranged and
Therebetween the second liquid crystal layer 233;It, should positioned at the second liquid crystal layer 233 close to the 4th electrode 234 of 231 side of third substrate
4th electrode 234 can be plate electrode or be the strip shaped electric poles extended along Y-direction;Positioned at the second liquid crystal layer 233 close to
5th electrode 235 of 232 side of tetrabasal, the 5th electrode 235 can be plate electrode or be the strip extended along Y-direction
Electrode;And deviate from the second polaroid 236 of 233 side of the second liquid crystal layer, second polaroid 236 positioned at the 4th electrode 234
Light transmission axis direction be, for example, Y-direction, i.e., the between axlemolecules of the between axlemolecules of the first polaroid 219 and the second polaroid 236 are mutually hung down
Directly.Wherein, liquid crystal molecule initial orientation of second liquid crystal layer 233 close to 234 side of the 4th electrode should be with the first polaroid 219
Identical light transmission axis direction for example can be X-direction, and liquid crystal molecule of second liquid crystal layer 233 close to 235 side of the 5th electrode is initial
Orientation should identical with the light transmission axis direction of the second polaroid 236 for example can be Y-direction.Further, third substrate 231 is located at
Between first substrate 211 and tetrabasal 232, and second substrate 212 and third substrate 231 can be same substrate, in order to
Reduce device integral thickness.
Based on this, by applying different voltage to the 4th electrode 234 and the 5th electrode 235 to control the inclined of liquid crystal molecule
Turn, you can realize the switching between aperture diaphragm and plate glass.Wherein, when lens stop 23 is used as aperture diaphragm, the
In two liquid crystal layers 233 deflection state of liquid crystal molecule can correspond to aperture 230 with the liquid crystal molecule deflection state in reference chart 4
The liquid crystal molecule at place is in different states from the liquid crystal molecule at corresponding other positions.
Based on above structure, Fig. 5 shows the structural parameters relational graph of the collimated light path of a luminescence unit 100.Wherein, if
The clear aperature of first diffraction lens 214 is D1, object space focal length be f1, image space focal length be f1', the thang-kng of the second diffraction lens 224
Aperture is D2, object space focal length be f2, image space focal length be f2', the light source of luminescence unit 100 is to each between the first diffraction lens 214
The sum of layer material thickness is-L1, layers of material refractive index close is n1, between first the 214 to the second polaroid of diffraction lens 236
The sum of layers of material thickness be L2, layers of material refractive index close is n2, second the 236 to the second diffraction lens of polaroid 224 it
Between the sum of layers of material thickness be-L3, layers of material refractive index close is also n2, image space medium residing for the second diffraction lens 224
Refractive index be n0.Based on this, there is following relationship between parameters:
L3=f2
(4);
In order to ensure that the collimated light beam of light source switching mechanism outgoing is uniform, the clear aperature D of the second diffraction lens 2242
It needs equal with the interval of the i.e. luminescence unit 100 of point light source.At this point, according to D2、L1、L2、L3、n1、n2、n0F can be obtained1、f1′、
f2、f2′、D1.In a specific embodiment, above-mentioned parameter can be respectively set to:D2=100 μm, L1=-0.3mm, L2=
0.3mm、L3=-0.5mm, n1=n2=1.5, n0=1, it can thus be concluded that:f1'=150 μm, f1=-150 μm, D1=60 μm, f2'=
333.3μm、f2=-500 μm.
In this example embodiment, the concrete structure of the first diffraction lens 214 and the second diffraction lens 224 can be with reference chart
6, such as multiple diffraction steps can be included.In figure, the annulus of top half illustrates two stepped phase diffraction lens centers
The top partial view diagram of position, the step of lower half portion are illustrated in the phase diffractive lens of two steps, four steps and eight steps
The partial side elevation view of heart position.Wherein, the diffraction efficiency of the diffraction lens of different numbers of steps is different, and numbers of steps is more,
Diffraction efficiency is higher.The present embodiment preferably uses the phase diffractive lens of eight steps.
By taking the first diffraction lens 214 as an example, which can include first to m-th phase grating list
Member, M are positive integer.Wherein, each raster unit includes N=2mA step, m are positive integer, and the phase difference of adjacent step is 2
π/N, step height are h=(λ/N)/(n-no), λ be lambda1-wavelength (white light polychromatic light usually takes λ=587nm), n first
The refractive index of diffraction lens, noIt is liquid crystal molecule in the first liquid crystal layer 213 relative to the minimum refractive index of incident polarized light.It is based on
This, in two stepped phase diffraction lens shown in Fig. 6, if the girdle radius in j-th of raster unit is respectively rj,1And rj,2,
J is the positive integer less than or equal to M.Then according to the property of diffraction lens:
Wherein, f1And n1The respectively object space focal length of the first diffraction lens 214 and the light source of luminescence unit 100 is to first
Layers of material refractive index between diffraction lens 214.
Based on this, each step width of two step diffraction lens is:
dj,1=rj,1-rj-1,2(8);
dj,2=rj,2-rj,1 (9)。
On this basis, for N step diffraction lens, there is the platform of N-1 same widths in each raster unit
Rank, the width of remaining step is of different size with above-mentioned N-1 step, the width of continuous N-1 step in jth raster unit
For:
The width of remaining step is in jth raster unit:
For example, for eight step diffraction lens, the first raster unit can be determined according to formula (10) and (11)
In 7 identical steps width be t1,2=d1,2/ 4, the width of a remaining step is t1,1=d1,1-d1,2/2-d1,2/4;Second
The width of 7 identical steps is t in raster unit2,2=d2,2/ 4, the width of a remaining step is t2,1=d2,1-d2,2/2-
d2,2/4;The width of 7 identical steps is t in third raster unit3,2=d3,2/ 4, the width of a remaining step is t3,1=
d3,1-d3,2/2-d3,2/4。
It will be appreciated that:Can determine through the above way two, four, eight, 16 and more numbers of steps it is each
Step width no longer repeats one by one here.
In addition, the design principle for the second diffraction lens 224 is identical with the first diffraction lens 214, therefore no longer
It repeats.
This example embodiment additionally provides a kind of display device, including above-mentioned light source switching mechanism.The light source switches
Device can provide collimated light source or scattering light source according to actual needs.
It should be noted that although several modules or list for acting the equipment performed are referred in above-detailed
Member, but this division is not enforceable.In fact, according to embodiment of the present disclosure, it is above-described two or more
The feature and function of module either unit can embody in a module or unit.A conversely, above-described mould
Either the feature and function of unit can be further divided into being embodied by multiple modules or unit block.
In addition, although describing each step of method in the disclosure with particular order in the accompanying drawings, this does not really want
Asking or implying must could realize according to the particular order come the step for performing these steps or having to carry out shown in whole
Desired result.It is additional or alternative, it is convenient to omit certain steps, by multiple steps merge into a step perform and/
Or a step is decomposed into execution of multiple steps etc..
Those skilled in the art will readily occur to the disclosure its after considering specification and putting into practice invention disclosed herein
His embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Adaptive change follow the general principle of the disclosure and including the undocumented common knowledge in the art of the disclosure or
Conventional techniques.Description and embodiments are considered only as illustratively, and the true scope and spirit of the disclosure are by claim
It points out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claim.
Claims (10)
- A kind of 1. light source switching mechanism, which is characterized in that the light including backlight module and positioned at the backlight module light emission side Source handover module;The light source handover module includes the first diffraction lens unit and the second diffraction lens unit and positioned there between Lens stop, the first diffraction lens unit are set close to the backlight module, and the second diffraction lens unit is far from institute Backlight module setting is stated, and the lens stop is located at the object space focal plane of the second diffraction lens unit;Under first light source state, the lens stop is used to form multiple apertures of array arrangement, first diffraction lens Unit is for focusing to the light that the backlight module is sent out at the aperture of the lens stop, the second diffraction lens unit Light beam regulation for will be emitted from the aperture of the lens stop is collimated light beam;Under second light source state, the lens stop, the first diffraction lens unit and the second diffraction lens unit The light for being used to that the backlight module is controlled to send out is directed through.
- 2. light source switching mechanism according to claim 1, which is characterized in that the axis in the aperture of the lens stop, institute The optical axis of optical axis and the second diffraction lens unit for stating the first diffraction lens unit coincides.
- 3. light source switching mechanism according to claim 1, which is characterized in that the backlight module includes being distributed in dot matrix Multiple luminescence units, the light source handover module includes the multiple light sources switch unit of array arrangement, the multiple luminous list It is first to be arranged in a one-to-one correspondence with the multiple light source switch unit.
- 4. according to claim 1-3 any one of them light source switching mechanisms, which is characterized in that the first diffraction lens unit Including:The first substrate and second substrate being oppositely arranged;The first liquid crystal layer between the first substrate and the second substrate;With adjacent first diffraction lens of first liquid crystal layer;Positioned at first liquid crystal layer close to the first electrode of the first substrate side;Positioned at first liquid crystal layer close to the second substrate side and the second electrode of mutually insulated and third electrode;And deviate from the first polaroid of the first liquid crystal layer side positioned at the first substrate;Wherein, first liquid crystal layer has first refractive index under the first light source state, in the second light source state There is down the second refractive index, and second refractive index is identical with the refractive index of first diffraction lens.
- 5. light source switching mechanism according to claim 4, which is characterized in that the lens stop includes:The third substrate and tetrabasal being oppositely arranged;The second liquid crystal layer between the third substrate and the tetrabasal;Positioned at second liquid crystal layer close to the 4th electrode of the third substrate side;Positioned at second liquid crystal layer close to the 5th electrode of the tetrabasal side;And deviate from the second polaroid of the second liquid crystal layer side positioned at the 4th electrode;Wherein, the third substrate is between the first substrate and the tetrabasal.
- 6. light source switching mechanism according to claim 5, which is characterized in that the second diffraction lens unit includes:The 5th substrate being oppositely arranged and the 6th substrate;Third liquid crystal layer between the 5th substrate and the 6th substrate;With adjacent second diffraction lens of the third liquid crystal layer;Positioned at the third liquid crystal layer close to the 5th substrate side and the 6th electrode of mutually insulated;With the 7th electrode;And positioned at the third liquid crystal layer close to the 8th electrode of the 6th substrate side;Wherein, the third liquid crystal layer has third reflect rate under the first light source state, in the second light source state There is down fourth refractive index, and the fourth refractive index is identical with the refractive index of second diffraction lens.
- 7. light source switching mechanism according to claim 5, which is characterized in that the second substrate is with the third substrate Same substrate.
- 8. light source switching mechanism according to claim 5, which is characterized in that the between axlemolecules of first polaroid with it is described The between axlemolecules of second polaroid are mutually perpendicular to.
- 9. light source switching mechanism according to claim 6, which is characterized in that the refractive index of first diffraction lens and institute The refractive index for stating the second diffraction lens is all higher than 1.7.
- 10. a kind of display device, which is characterized in that including claim 1-9 any one of them light source switching mechanisms.
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