CN109307903A - A kind of backlight of outgoing polarization light and preparation method thereof and liquid crystal display device - Google Patents
A kind of backlight of outgoing polarization light and preparation method thereof and liquid crystal display device Download PDFInfo
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- CN109307903A CN109307903A CN201710631969.2A CN201710631969A CN109307903A CN 109307903 A CN109307903 A CN 109307903A CN 201710631969 A CN201710631969 A CN 201710631969A CN 109307903 A CN109307903 A CN 109307903A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
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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
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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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
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
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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
- G02F1/133528—Polarisers
- G02F1/13355—Polarising beam splitters [PBS]
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- Optics & Photonics (AREA)
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- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
A kind of backlight of outgoing polarization light and preparation method thereof and liquid crystal display device.The backlight includes: light source；Polarisation light guide plate, the polarisation light guide plate is configured with incidence surface and light-emitting surface, the incidence surface is connected with the light-emitting surface, wherein, the light source is towards the incidence surface, and the natural light that the light source issues enters the polarisation light guide plate via the incidence surface, is projected in the form of polarised light from the light-emitting surface；Light correcting layer, the light correcting layer are consistently arranged on the polarisation light guide plate with the polarisation light guide plate substantially size, wherein the light correcting layer is made of isotropic material；And low-index layer, the low-index layer are arranged between the polarisation light guide plate and the light correcting layer.Backlight of the invention can flexibly control the distribution arrangement of outgoing polarization light, improve light extraction efficiency, increase material and select flexibility, simplify the manufacture craft of backlight and reduce production cost.
Description
Technical field
The present invention relates to liquid crystal display device, in particular to a kind of backlight of outgoing polarization light.
Background technique
Flat-panel monitor such as liquid crystal display (LCD) is the necessary parts of the electronic equipment of numerous species.As passive-type
Luminescent device, one of liquid crystal display are to carry out screen illuminating by the backlight at the display screen back side.Since liquid crystal flat-panel is aobvious
Show the display requirement of device, the light of effective use is the light of particular polarization.For the backlight of traditional outgoing natural light,
For the utilization rate of final luminous intensity often less than the 5% of original luminous intensity, light loss is very high.If the light being depleted is not repeated
It utilizes, the adverse effects such as temperature raising can be caused.
A solution is that (such as 3M is public for additional reflection formula polarizing diaphragm between natural light backlight and LCD panel
The DBEF of department), the reflection of unemployed polarised light is recovered in backlight, to be recycled.The characteristics of this film is
There is transmission function to the light of a polarization direction, and has reflection function to the light of another polarization direction normal thereto.It is anti-
The light penetrated re-enters into the light guide plate of backlight, and after depolarization, Partial Conversion to available polarization state can make axis as a result,
To brightness increase about 60%.
Another solution is the backlight for directly using a kind of capable of emitting polarised light, in conjunction with reflection as described above
Formula or scattering formula polarizing diaphragm, achieve the effect that improve light utilization efficiency.In this solution, directly in back light source structure
Using polarization separation technology, using the relevant total reflection of polarization, scattering and there is optically anisotropic liquid crystal layer to coat,
To achieve the purpose that issue polarised light.Such as the back light source system disclosed in US5729311A, the light including a special designing
Ducting layer, unpolarized light are coupled into optical waveguide via the side cross-sectional of optical waveguide and propagate forward.It is equipped in optical waveguide recessed
Chamber, wherein being filled with optically anisotropic material.Waveguide material refractive index is np, the refractive index of optical anisotropic material is
noAnd ne.For the requirement for meeting polarization state separation, noOr neIn one be equal or substantially equal to np.But this structure lacks
Point is, in fabrication, difficulty when into cavity such as filling material and wave caused by the particular/special requirement of curved cavity
The difficulty of processing of guide plate itself increases, so that manufacturing cost is higher.
The problem of patent CN100564998C is to involved in US5729311A improves, and is given based on this with layer
The backlight of shape structure, polarization separation film layer is independent from light guide plate.But since its polarised light outgoing mechanism is total reflection,
And emergent ray need to meet certain angle requirement (such as emergent ray direction need to be near normal), therefore to the ruler of micro-structure
The selection of very little, shape and material can all have significant limitation.
In addition the structure of existing polarisation backlight, although overcoming shooting angle is distributed wide feature, when polarization point
After absciss layer determines, the angular distribution of outgoing just determines therewith, it is difficult to be modulated again.To, the structure selectivity of production and can
Material selection range is all restricted.
Accordingly, it is desirable to provide a kind of backlight, the backlight can outgoing polarization light, improve light utilization efficiency, while can spirit
Control living is incident and outgoing polarization light distribution direction is to be further simplified manufacture craft reduces cost, improves efficiency.
Summary of the invention
To meet the demand, the present invention propose it is a kind of can outgoing polarization light backlight, the backlight includes: light
Source, polarisation light guide plate, the polarisation light guide plate are configured with incidence surface and light-emitting surface, the incidence surface and the light-emitting surface phase
Even, wherein the light source is towards the incidence surface, and the natural light that the light source issues is via described in incidence surface entrance
Polarisation light guide plate, in a manner of polarised light from the light-emitting surface project, light correcting layer, the light correcting layer by with it is described partially
Light guide tabula rasa substantially size is consistently arranged on the polarisation light guide plate, wherein the light correcting layer is by isotropism
Material composition and low-index layer, the low-index layer be arranged on the polarisation light guide plate and the light correction
Between layer.In optional embodiment, the backlight further comprises light source regulating course, and the light source regulating course is arranged on
Between the incidence surface and the light source of the polarisation light guide plate.In preferred embodiments, the light correcting layer
Refractive index is between 1.40 to 1.65.In preferred embodiments, the low-index layer can be air layer.
In preferred embodiments, the light correcting layer is provided with arranged in parallel far from the surface of the polarisation light guide plate
Oblique triangle prism structure, wherein the oblique triangle prism structure extends along the incidence surface direction is parallel to.Optional
Embodiment in, the light correcting layer close to the surface of the polarisation light guide plate be further provided with along perpendicular to it is described enter
The groove structure that smooth surface direction extends.In preferred embodiments, the cross section of groove structure is waveform or isoceles triangle
Shape.
It can further comprise additional light correcting layer in another optional embodiment, the additional light is rectified
Positive layer is consistently arranged on the light correcting layer with the polarisation light guide plate substantially size or is arranged described
Between light correcting layer and the low-index layer, wherein the table of the additional light correcting layer far from the polarisation light guide plate
Face is provided with equidistant and arranged in parallel isosceles triangle prism structure, and the isosceles triangle prism structure is along perpendicular to described
Incidence surface direction extends.In preferred embodiments, the base angle of the isosceles triangle prism structure can be in 35 to 50 degree
Between change.
In further preferred embodiment, the distance between adjacent apex angle of the prism structure and the prism structure
The length ratio on bottom edge can change between 1 to 2.
In preferred embodiments, the polarisation light guide plate includes: base, the upper surface of the base have along with it is described
The micro-lens structure and birefringent layers that the incidence surface parallel direction of polarisation light guide plate extends, the birefringent layers
The upper surface of lower surface and the base is seamless to combine closely, and the upper surface of the birefringent layers is substantially smooth surface,
The optical axis direction of the birefringent layers is arranged essentially parallel to the extending direction of the micro-lens structure, wherein the base
Refractive index and the ordinary refraction index of the birefringent layers are substantially consistent.In alternative embodiments, the polarisation is guide-lighting
Plate further comprises the supporting layer being arranged under the base lower surface, the refractive index of the supporting layer 1.45 to 1.65 it
Between.In preferred embodiments, the birefringent layers are liquid crystal layer.In a further preferred embodiment, the liquid crystal
The extraordinary ray of layer and the refringence of ordinary light are between 0.1 to 0.35.In another preferred embodiment, the base
Thickness can change.
In preferred embodiments, the light source regulating course is provided with prism arranged in parallel close to the surface of the light source
Structure, wherein the prism structure extends along the light-emitting surface direction for being parallel to the polarisation light guide plate.In preferred implementation side
In case, any base angle of the prism structure can change between 0 to 90 degree (including 90 degree).In an optional embodiment
In, the prism structure equidistant arrangement, and the distance between adjacent apex angle of the prism structure and the prism structure bottom edge
Length ratio can change between 1 to 2.In another optional embodiment, the prism structure is Fresnel lens structure.
In optional embodiment, the light source regulating course is provided with close to the surface of the light source along perpendicular to described inclined
The light-emitting surface direction of light guide tabula rasa extends and bulge-structure arranged in parallel, and cross section is light cupuliform.
In preferred embodiments, a kind of method for preparing the backlight is disclosed, including is individually formed the polarisation
Light guide plate, the light source, the light correcting layer and the low-index layer, are then combined in a manner of splicing, the splicing
The light-emitting surface including the low-index layer and the light correcting layer to be first arranged in the polarisation light guide plate is described low
The light source is arranged in the polarisation light guide plate between the light correcting layer and the polarisation light guide plate for index layer
The incidence surface, wherein the connecting method include fitting.In optional embodiment, the method further includes: solely
It is vertical to form the light source regulating course, the light source regulating course is arranged between the light source and the polarisation light guide plate.
In preferred embodiments, a kind of liquid crystal display device, including liquid crystal display panel and the backlight are disclosed,
The liquid crystal display panel is arranged on the light-emitting surface side of the backlight, and the liquid crystal display panel is close to backlight side
The light transmission shaft of polarizing film be arranged essentially parallel to the polarization direction of the backlight emergent ray.
Backlight disclosed by the invention can not only polarized light-emitting, improve the light utilization efficiency of backlight, while utilizing light
Correcting layer adjusts the angular distribution from polarization separation layer polarization emergent light, keeps the direction of polarised light symmetrical along normal, thus
The production complexity of polarization separation layer is substantially reduced, while widening the material selection range of polarization separation layer.The present invention is into one
Step adjusts incident light angle using light source regulating course and is distributed, and further increases the utilization rate of incident light.In addition, each portion of the invention
Dividing independently to make, flexibly assembled, to be further simplified the manufacture craft of backlight, reduce cost, improve efficiency.
Detailed description of the invention
The present invention may be better understood by referring to illustrating for embodiment of the present invention, in the accompanying drawings:
Fig. 1 is the structural schematic diagram of backlight according to embodiments of the present invention.
Fig. 2 is the operation principle schematic diagram of backlight according to embodiments of the present invention.
Fig. 3 is the structural schematic diagram of light correcting layer according to embodiments of the present invention.
Fig. 4 is the cross section and operation principle schematic diagram according to Fig. 3 structure.
Fig. 5 is the structure and cross-sectional of light correcting layer according to embodiments of the present invention.
Fig. 6 is the structural schematic diagram of additional light correcting layer according to embodiments of the present invention.
Fig. 7 is the cross section and operation principle schematic diagram according to Fig. 6 structure.
Fig. 8 is the structure and working principle schematic diagram of polarisation light guide plate according to embodiments of the present invention.
Fig. 9 is the schematic illustration that luminous intensity is adjusted out by changing the thickness of base.
Figure 10 is the structural schematic diagram of the polarisation light guide plate according to embodiments of the present invention including supporting layer.
Figure 11 is the structural schematic diagram of backlight according to embodiments of the present invention.
Figure 12 is the operation principle schematic diagram of light source regulating course according to embodiments of the present invention.
Figure 13 is the cross-sectional of light source regulating course according to embodiments of the present invention.
Figure 14 is the vertical view and structural schematic diagram of light source regulating course according to embodiments of the present invention.
Figure 15 is each layer joining method schematic diagram according to embodiments of the present invention.
Specific embodiment
In the following description, it in order to reach purpose of explanation to have a comprehensive understanding to the present invention, illustrates
A large amount of detail, it will be evident, however, that those skilled in the art, it can also be real without these details
The existing present invention.In other examples, well known construction and device is shown in box chart.In this respect, that is lifted is illustrative
Example embodiment only for explanation, the present invention is not caused to limit.Therefore, protection scope of the present invention is not by above-mentioned
Specific embodiment is limited, and is only subject to the range of appended claims.
With reference first to Fig. 1, there is shown with a kind of backlight of outgoing polarization light according to an embodiment of the present invention, the backlights
Source may include light source 100, the propagation of guidance light and the polarisation light guide plate that the natural light that light source 100 issues is transformed into polarised light
200, the light correcting layer 300 with polarised light exit direction correcting function, and it is located at polarisation light guide plate 200 and light correction
Low-index layer 400 between layer 300.Wherein, polarisation light guide plate 200, light correcting layer 300 and low-index layer 400 are basic
The upper consistent parallel stacked arrangement of size.Low-index layer 400 is used to be spaced polarisation light guide plate 200 and light correcting layer 300, makes
The incident light for being transformed into polarised light in polarisation light guide plate 200 can be coupled from the light-emitting surface of polarisation light guide plate 200 to be emitted.Low refraction
Rate layer 400 can be air layer, and thickness is adjustable, and the thickness of low-index layer 400 is such as adjusted using introns.
As shown in Fig. 2, polarisation light guide plate 200 has incidence surface 201, connects the light-emitting surface of incidence surface 201 and connect out
Smooth surface and the side 202 opposite with incidence surface 201.Light source 100 is arranged towards incidence surface 201.From light source 100 issue light from
The incidence surface 201 of polarisation light guide plate 200 enters polarisation light guide plate 200, on it the continuous alternating reflex in lower surface, with waveguide
Form is propagated.During propagation, optical waveguide can be made mutually with the internal structure (being described below) of polarisation light guide plate 200
With s- polarised light therein can be separated with certain probability to be emitted from the light-emitting surface (upper surface) of polarisation light guide plate 200, and p-
Polarised light then keeps waveguide mode to propagate forward, is partially converted to the outgoing of s- polarised light.The light that can not be wherein emitted is then from inclined
The side 202 of light guide tabula rasa 200 leaks out.Generally, it depending on the internal structure and material of polarisation light guide plate 200, is led from polarisation
The exit direction of the s- polarised light of 200 upper surface of tabula rasa outgoing might not be symmetrical along the presentation of the normal of upper surface, such as
Light 211 and 212 in Fig. 2.And in the application of usual backlight, it is desirable that emergent light is symmetrical along the light-emitting surface normal of backlight
Distribution, this requires that the internal structure of polarisation light guide plate 200 and material must be it is optimal, so as to cause polarisation light guide plate
200 structure and selected materials is limited.And the effect of light correcting layer 300 is, it can be by 211 He of light of tilt distribution
212 to correct to normal symmetrical, such as light 311 and 312.Simultaneously as the material of light correcting layer 300 is isotropic
Material, can keep the polarization characteristic of transmitted ray while correcting radiation direction, i.e., the polarization direction of light 311 and 312 with
The polarization direction of light 211 and 212 is consistent, is all s- polarization, to guarantee the polarizability of backlight emergent ray.Light correction
The refractive index of layer is between 1.40 to 1.65, and light transmittance is 90% or more.
In one embodiment, the upper surface of light correcting layer 300 has a parallel and equidistant arrangement, and along be parallel into
The prism structure that 201 direction of smooth surface extends, as shown in Figure 3.The height of prism structure is 5 to 50 microns.As shown in figure 4, into
Light 321,322,323 or 324 inside to light correcting layer 300, after refraction or total reflection occur for the surface of prism again
Refraction is projected from prism surface, to form the emergent ray 331,332,333 or 334 with new direction.Prism it is crosscutting
Face is oblique triangle, can be converted the incident light 211 and 212 of tilt distribution to right by two base angles of adjusting oblique triangle
Claim the emergent light 311 and 312 of distribution.The degree at the left and right base angle of oblique triangle prism is depended on into light correcting layer 300
The inclined degree of incident polarized light, that is, the inclined degree of the polarised light from the outgoing of polarisation light guide plate 200 further take
Certainly in the structure and material of polarisation light guide plate 200.In preferred embodiments, the distance between two adjacent prism vertex angles L1
With prism bottom edge length L2Ratio can change in the range of 1 to 2.
In alternative embodiments, the lower surface of light correcting layer 300 has in parallel and equidistant arrangement simultaneously, and along
Perpendicular to the groove structure that 201 direction of incidence surface extends, as shown in Figure 5.The cross section of groove structure can be waveform, just as
Shown in Fig. 5, it is also possible to isosceles triangle, effect is to make the polarised light being emitted from polarisation light guide plate 200 laterally (with groove
The vertical direction of extending direction) total light intensity is uniform.For wavy groove structure, the distance between peaks and troughs L3And
The distance between adjacent peaks or trough L4No more than 100 microns.
It in another embodiment, further include another layer of light correcting layer 300a in addition to light correcting layer 300.Light is rectified
The upper surface of positive layer 300a has in parallel and equidistant arrangement, and along the prism structure extended perpendicular to 201 direction of incidence surface, such as
Shown in Fig. 6.The cross section of prism is isosceles triangle, and base angle can change between 35 degree to 50 degree.The height of isosceles triangle
Degree is 5 to 50 microns, and the distance between two adjacent prism vertex angles L5With prism bottom edge length L6Ratio can be 1 to 2
Variation in range.Light correcting layer 300a may be provided at the upper layer of light correcting layer 300, also can be set in light correcting layer
Between 300 and low-index layer 400.As shown in fig. 7, the large angle incidence light that light correcting layer 300a will can transversely dissipate
The emergent light of low-angle is aggregated into, to improve backlight in positive light distribution.
In another embodiment, as shown in figure 8, polarisation light guide plate 200 may include base 203 and birefringent layers 204,
Have with the upper surface that birefringent layers 204 are combined closely along parallel with the incidence surface 201 of polarisation light guide plate 200 in base 203
The micro-lens structure that direction extends.Surface of the birefringent layers 204 far from base is substantially smooth surface.Birefringent layers
204 are made of the material with birefringence, have ordinary refraction index noWith extraordinary ray refractive index ne, and neGreater than no.It is double
The optical axis direction of refracting layer 204 is arranged essentially parallel to the extending direction of the micro-lens structure in base 203, such birefringent layers
204 refractive indices n is maximum in the direction orthogonal with extending direction, to improve the efficiency of polarization separation.Preferred
In embodiment, birefringent layers 204 are liquid crystal layer, extraordinary ray refractive index neWith ordinary refraction index noDifference Δ n 0.1
To between 0.35.Base 203 is made of isotropic uniform dielectric, the ordinary anaclasis of refractive index and birefringent layers 204
Rate noIt is substantially consistent.Due to the presence of birefringent layers 204, so that the light of the light of s- polarization and p- polarization is in polarisation light guide plate
200 inside have different optical paths.For example, for the light 221 of s- polarization, at the interface of micro-lens and birefringent layers 204
There is total reflection in place, the light angle after being totally reflected enters the angular range of outgoing, to no longer meet waveguide mode, from inclined
It projects the upper surface of light guide tabula rasa 200.For the light 222 of p- polarization, since it is in base 203 and birefringent layers 204
Refractive index is substantially consistent, and at its interface, there is no total reflections, original direction can be kept to continue to propagate in the form of waveguide, no
It can be projected from the upper surface of polarisation light guide plate 200, thus realize the characteristic of polarization separation, and selective outgoing s- polarization
Light.The light for the p- polarization propagated with waveguide form, by scattering or optically-active etc., is partially converted into s- polarization in communication process
Light is emitted so as to be changed again the direction of propagation from upper surface.In preferred embodiments, the thickness L of base 2037It can
To adjust, so as to adjust the intensity of polarization light projected from light-emitting surface.As shown in figure 9, the light incident with direction 113, in base 203
Interior constantly to be reflected by waveguide mode, the light of s- polarization is in reflection communication process by the micro-lens of 203 upper surface of base
Structure projects after changing direction from light-emitting surface.When the thickness of base 203 reduces, light equally incident with direction 113, identical
The number of reflection of spread length increase, so that the chance contacted with micro-lens structure increases, be finally emitted from light-emitting surface
Chance also increase, achieve the effect that enhance luminous intensity out.In preferred embodiments, the thickness of base 203 should be not less than light
The height in source 100 can make the incident light being emitted from light source 100 fully enter base 203.In preferred embodiments, base 203
Micro-lens structure height be not more than 100 microns, and the thickness of birefringent layers 204 be not less than micro-lens structure height
Degree, so that micro-lens structure is integrally incorporated in birefringent layers 204.
In alternative embodiments, polarisation light guide plate 200 may further include supporting layer 205.As shown in Figure 10, it props up
The lower surface of the upper surface and base 203 of supportting layer 205 is combined closely, and the size of contact surface is substantially consistent.Supporting layer 205 can
It is made of the homogeneous material of isotropic, refractive index is between 1.45 to 1.65；It can also be by the material with certain birefringence
Material composition, such as PET material, the light of p- polarization when propagating wherein can constantly optically-active, realize that p- polarizes the conversion polarized to s-.
The distribution arrangement for the light that polarisation light guide plate 200 is emitted depends on the refractive indices n of birefringent layers 204, and
The shape of microstructure on 203 inner surface of base.For the birefringent material of the microstructure and optimization that have set, from inclined
The light that light guide tabula rasa 200 is emitted can be symmetrical along light-emitting surface normal direction.Otherwise, the distribution arrangement of emergent light will incline
Tiltedly, to limit the selection of birefringent material.By increasing light correcting layer 300, the distribution arrangement of emergent light is corrected, is allowed to
It is symmetrical with normal direction, to reduce the restricted of material, reduce costs.
In another embodiment, backlight may further include light source regulating course 500.As shown in figure 11, light source tune
Ganglionic layer 500 is arranged between light source 100 and polarisation light guide plate 200, and size and light source 100 and polarisation light guide plate 200 enter
Smooth surface is almost the same.General light source 100, such as the light that LED light source issues, have specific distribution curve flux, according to light and sit
The angle of parameter, the ray clasification that light source 100 issues are low-angle light 111 and high angle scattered light 112, wherein low-angle light
111 distribution arrangement leans on the normal direction of 100 light-emitting surface of close to sources, and the directional spreding of high angle scattered light 112 deviates light source 100
The normal direction of light-emitting surface, as shown in figure 12.Light 111 and 112 is propagated simultaneously in the waveguiding mode after entering polarisation light guide plate 200
After interacting with birefringent layers 204, high angle scattered light 112 meets the outgoing condition of polarisation light guide plate 200, penetrates from light-emitting surface
Out；And low-angle light 111 is then unable to satisfy the outgoing condition of polarisation light guide plate 200, continues to propagate in the waveguiding mode, finally from
The side 202 opposite with the incidence surface 201 of polarisation light guide plate 200 leaks out.For general light source, final outgoing condition can be met
High angle scattered light 112 only accounts for the 30% or less of total amount light.The light that light source regulating course 500 can issue light source 100 into
Row adjusts again, so that part low-angle light 111 is transformed into high angle scattered light 512, so that the ratio of high angle scattered light 512 increases
Add, to increase the light of 200 light-emitting surface of polarisation light guide plate coupling outgoing, to enhance the light intensity of backlight.The portion not being adjusted
Divide low-angle light 511 that can still leak out from side 202.In a preferred embodiment, by light source regulating course 500 it
Afterwards, the ratio that high angle scattered light accounts for total amount light can increase to 60% or more.
As shown in (a) in Figure 13, light source regulating course 500 has prism structure arranged in parallel, prism knot in incidence surface
Structure extends along the direction parallel with the light-emitting surface of polarisation light guide plate 200.The height of prism is 5 to 50 microns.It is adjusted into light source
The low-angle light of layer 500 is by the refraction twice with prism surface and right side plan, to generate the effect of outside deviation, shape
At the high angle scattered light in off-normal direction.Prism structure can be isosceles triangle or oblique triangle, and two base angles can be 0 to 90
Change between degree (including 90 degree).In an optional embodiment, the prism is equidistant arrangement, such as (b) in Figure 13
It is shown, and the distance between two adjacent prism vertex angles L8With prism bottom edge length L9Ratio can become in the range of 1 to 2
Change.In another optional embodiment, as shown in (c) in Figure 13, the prism structure is Fresnel lens structure.
In another optional embodiment, light source regulating course 500 has bulge-structure arranged in parallel in incidence surface,
But this bulge-structure extends along the direction of the light-emitting surface perpendicular to polarisation light guide plate 200, as shown in the top view on the left side Figure 14.
The cross section of bulge-structure is light cupuliform.The chassis size of light cup and the size of the LED chip in light source 100 match.Through light
The light that regulating course 500 incidence surface in source enters, wherein high angle scattered light in a lateral direction can be got on the side of light cup, warp
After reflection, become the light of low-angle, will to enter the light angle distribution of polarisation light guide plate horizontally narrowed to play
Function.The shape of light wall of cup can be conic section, straight line or end to end broken line.
In another embodiment, the method for preparing above-mentioned described backlight is disclosed, including is individually formed light
Source 100, polarisation light guide plate 200, light correcting layer 300 and low-index layer 400, then combine to form back in a manner of splicing
Light source.As shown in (a) in Figure 15, the going out in polarisation light guide plate 200 by light correcting layer 300 and the splicing of low-index layer 400
Smooth surface, low-index layer 400 is between light correcting layer 300 and polarisation light guide plate 200；Light source 100 is spliced and is led in polarisation
The incidence surface of tabula rasa 200.In a preferred embodiment, low-index layer 400 be air layer, light correcting layer 300 with
Do not fitted closely between polarisation light guide plate 200, but form air layer, the thickness of air layer can by addition introns come
Control.Between light source 100 and polarisation light guide plate 200, it can not also fit closely, there are air voids between adjacent two layers.?
In optional embodiment, the preparation method of backlight further includes being individually formed light source regulating course 500, and light source regulating course 500 is spelled
It connects between light source 100 and polarisation light guide plate 200, as shown in (b) in Figure 15.Light source regulating course 500 can be bonded with glue 600
It is spliced on light source regulating course 500 onto the incidence surface of polarisation light guide plate 200, then by light source 100 by the above method.
In another the embodiment of the present invention, a kind of liquid crystal display device is provided, including is appointed in the embodiment above
Backlight and liquid crystal display panel described in one, liquid crystal display panel are arranged on the light-emitting surface side of backlight, and liquid crystal
Display panel is arranged essentially parallel to the polarization side of above-mentioned backlight emergent ray close to the light transmission shaft of the polarizing film of backlight side
To.Therefore the light that above-mentioned backlight provides is the linearly polarized light with particular polarization, by liquid crystal display panel
Down polaroid when, since its polarization direction is consistent with the axis of homology of down polaroid, have very high transmitance, ideally
It can achieve substantially 100% to pass through, to improve the light utilization efficiency of backlight, save energy consumption.Simultaneously because the backlight
Emergent light intensity and angular distribution have passed through design, make final display uniform intensity, display angular is controllable, has very
Good display effect.
Although having been described above with the several exemplary implementation schemes of datail description, disclosed embodiment is only
Exemplary and those skilled in the art will readily appreciate that and not restrictive, a lot of other in an exemplary embodiment
It is possible for modifying, changing and/or replacing, and the novel teachings and advantage of the disclosure are deviateed without essence.Therefore, all these
Modification, change and/or replacement are intended to be included in the scope of the present disclosure as defined by the appended claims.
Claims (25)
1. a kind of backlight of outgoing polarization light, the backlight include:
Light source；
Polarisation light guide plate, the polarisation light guide plate are configured with incidence surface and light-emitting surface, the incidence surface and the light-emitting surface phase
Even, wherein the light source is towards the incidence surface, and the natural light that the light source issues is via described in incidence surface entrance
Polarisation light guide plate is projected in a manner of polarised light from the light-emitting surface；
The polarisation is consistently arranged in the polarisation light guide plate substantially size in light correcting layer, the light correcting layer
On light guide plate, wherein the light correcting layer is made of isotropic material；And
Low-index layer, the low-index layer are arranged between the polarisation light guide plate and the light correcting layer.
2. backlight as described in claim 1, wherein the backlight further comprises light source regulating course, the light source is adjusted
Layer is arranged between the incidence surface and the light source of the polarisation light guide plate.
3. backlight as claimed in claim 1 or 2, wherein the light correcting layer is set far from the surface of the polarisation light guide plate
It is equipped with oblique triangle prism structure arranged in parallel, the oblique triangle prism structure edge is parallel to the incidence surface direction and prolongs
It stretches.
4. backlight as claimed in claim 3, wherein the light correcting layer is close to the surface of the polarisation light guide plate into one
Step is provided with groove structure, and the groove structure extends along perpendicular to the incidence surface direction.
5. backlight as claimed in claim 4, wherein the cross section of the groove structure is waveform.
6. backlight as claimed in claim 4, wherein the cross section of the groove structure is isosceles triangle.
7. backlight as claimed in claim 3, wherein the backlight further comprises additional light correcting layer, it is described attached
The light correcting layer added be consistently arranged on the light correcting layer with the polarisation light guide plate substantially size or
It is arranged between the light correcting layer and the low-index layer, wherein the additional light correcting layer is far from the polarisation
The surface of light guide plate is provided with equidistant and arranged in parallel isosceles triangle prism structure, isosceles triangle prism structure edge
Extend perpendicular to the incidence surface direction.
8. backlight as claimed in claim 7, wherein the base angle of the isosceles triangle prism structure can be at 35 degree to 50
Change between degree.
9. the backlight as described in claim 3,6 or 7, wherein the distance between adjacent apex angle of the prism structure with it is described
The length ratio on prism structure bottom edge can change between 1 to 2.
10. backlight as claimed in claim 1 or 2, wherein the refractive index of the light correcting layer is between 1.40 to 1.65.
11. backlight as claimed in claim 1 or 2, wherein the polarisation light guide plate includes:
Base, the upper surface of the base have a micro-lens structure, the extending direction of the micro-lens structure and it is described partially
The incidence surface of light guide tabula rasa is parallel；And
Birefringent layers, the upper surface of the lower surface of the birefringent layers and the base is seamless to combine closely, the birefringent layers
Upper surface be substantially smooth surface, the optical axis direction of the birefringent layers is arranged essentially parallel to the micro-lens structure
Extending direction,
Wherein, the refractive index of the base and the ordinary refraction index of the birefringent layers are substantially consistent.
12. backlight as claimed in claim 11, wherein the birefringent layers are liquid crystal layer.
13. backlight as claimed in claim 12, wherein the extraordinary ray of the liquid crystal layer and the refringence of ordinary light exist
Between 0.1 to 0.35.
14. backlight as claimed in claim 11, wherein the thickness of the base can change.
15. backlight as claimed in claim 11, wherein the polarisation light guide plate further comprises supporting layer, the supporting layer
It is arranged under the lower surface of the base, the refractive index of the supporting layer is between 1.45 to 1.65.
16. backlight as claimed in claim 2, wherein the light source regulating course is provided in parallel close to the surface of the light source
The prism structure of arrangement, the prism structure extend along the light-emitting surface direction for being parallel to the polarisation light guide plate.
17. backlight as claimed in claim 16, wherein any base angle of the prism structure can be not more than 90 degree
Variation in range.
18. backlight as claimed in claim 17, wherein the prism structure equidistant arrangement, the adjacent top of the prism structure
The distance between angle and the length ratio on the prism structure bottom edge can change between 1 to 2.
19. backlight as claimed in claim 16, wherein the prism structure is Fresnel lens structure.
20. backlight as claimed in claim 2, wherein the light source regulating course is provided in parallel close to the surface of the light source
The bulge-structure of arrangement, the bulge-structure extend along the light-emitting surface direction perpendicular to the polarisation light guide plate.
21. backlight as claimed in claim 20, wherein the cross section of the bulge-structure is light cupuliform.
22. backlight as claimed in claim 1 or 2, wherein the low-index layer is air layer.
23. a kind of method for preparing backlight as claimed in claim 1 or 2, which comprises
It is individually formed the polarisation light guide plate, the light source, the light correcting layer and the low-index layer,
It is combined in a manner of splicing, the splicing includes that first the low-index layer and the light correcting layer are arranged described
The light-emitting surface of polarisation light guide plate, the low-index layer between the light correcting layer and the polarisation light guide plate,
The light source is arranged in the incidence surface of the polarisation light guide plate,
Wherein, the mode of the splicing includes fitting.
24. method as claimed in claim 23, the method further includes:
It is individually formed the light source regulating course,
The light source regulating course is arranged between the light source and the polarisation light guide plate.
25. a kind of liquid crystal display device, the liquid crystal display device includes liquid crystal display panel and as claimed in claim 1 or 2
Backlight, the liquid crystal display panel is arranged on the light-emitting surface side of the backlight, and the liquid crystal display panel is close
The light transmission shaft of the polarizing film of backlight side is arranged essentially parallel to the polarization direction of the backlight emergent ray.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631969.2A CN109307903B (en) | 2017-07-28 | 2017-07-28 | Backlight source for emitting polarized light, preparation method thereof and liquid crystal display device |
| PCT/CN2018/094520 WO2019019888A1 (en) | 2017-07-28 | 2018-07-04 | A polarizing backlight unit, method of manufacturing the same and liquid crystal display device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631969.2A CN109307903B (en) | 2017-07-28 | 2017-07-28 | Backlight source for emitting polarized light, preparation method thereof and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109307903A true CN109307903A (en) | 2019-02-05 |
| CN109307903B CN109307903B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710631969.2A Active CN109307903B (en) | 2017-07-28 | 2017-07-28 | Backlight source for emitting polarized light, preparation method thereof and liquid crystal display device |
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| Country | Link |
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| CN (1) | CN109307903B (en) |
| WO (1) | WO2019019888A1 (en) |
Cited By (3)
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| CN111983740A (en) * | 2019-05-24 | 2020-11-24 | 宁波激智科技股份有限公司 | Dimming layer, light-splitting dimming layer and visual angle modulation component |
| CN112882148A (en) * | 2021-03-17 | 2021-06-01 | 江苏集萃智能液晶科技有限公司 | Backlight source structure |
| WO2021119882A1 (en) * | 2019-12-16 | 2021-06-24 | 重庆康佳光电技术研究院有限公司 | Display device capable of changing direction of light |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109307903B (en) | 2020-05-12 |
| WO2019019888A1 (en) | 2019-01-31 |
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