Summary of the invention
Therefore the purpose of this invention is to provide liquid crystal lens assembly and the display device thereof that a kind of 2D/3D switches, this liquid crystal lens assembly is to utilize the electric field that control electrode produced that is positioned on the electrode layer, adjust the refractive index of birefraction convex lens, to solve the problem of background technology.
The invention provides the display device that a kind of 2 dimensions/3 dimension show images switch, comprise a backlight module, a liquid crystal panel and a liquid crystal lens assembly, described backlight module is used to produce light, described liquid crystal panel is used for according to the light show image of described backlight module generation, and the light that described liquid crystal panel transmits is polarized light.Described liquid crystal lens assembly comprises the strip concavees lens of a plurality of adjacent arrangements and the strip liquid crystal convex lens of a plurality of adjacent arrangements in regular turn from exiting surface to incidence surface.The strip liquid crystal convex lens of described a plurality of adjacent arrangements, one one corresponding described a plurality of concavees lens, described a plurality of strip liquid crystal convex lens comprise a transparency carrier, one is positioned at the electrode layer on this transparency carrier, and one first liquid crystal layer, this first liquid crystal layer is sandwiched between these concavees lens and the transparency carrier.This electrode layer comprises a plurality of control electrodes, described a plurality of control electrode is used to control the orientation of liquid crystal molecule of described birefringence liquid crystal convex lens to adjust its equivalent refractive index, makes the equivalent refractive index of described liquid crystal convex lens be equal to, or greater than first refractive index of described concavees lens.
The present invention provides a kind of liquid crystal lens assembly in addition, and it comprises the strip concavees lens of a plurality of adjacent arrangements and the strip liquid crystal convex lens of a plurality of adjacent arrangements in regular turn from exiting surface to incidence surface.The strip liquid crystal convex lens of described a plurality of adjacent arrangements, one one corresponding described a plurality of concavees lens, described a plurality of strip liquid crystal convex lens comprise a transparency carrier, one is positioned at the electrode layer on this transparency carrier, and one first liquid crystal layer, this first liquid crystal layer is sandwiched between these concavees lens and the transparency carrier.This electrode layer comprises a plurality of control electrodes, described a plurality of control electrode is used to control the orientation of liquid crystal molecule of described birefringence liquid crystal convex lens to adjust its equivalent refractive index, makes the equivalent refractive index of described liquid crystal convex lens be equal to, or greater than first refractive index of described concavees lens.
According to embodiments of the invention, the refractive index of described concavees lens equals the ordinary refraction index of the liquid crystal molecule of described first liquid crystal layer.
According to embodiments of the invention, described control electrode is a strip, and its bearing of trend is consistent with described strip liquid crystal convex lens bearing of trend.This liquid crystal lens assembly cooperates linearly polarized photon to use, and described a plurality of strip liquid crystal convex lens extend along a first direction, and along second direction arrangement, this first direction is perpendicular to this second direction, and the polarization direction of described polarized light is perpendicular to first direction.Described liquid crystal convex lens comprise that further one is arranged at the alignment film on surface of close described first liquid crystal layer of described transparency carrier, and this alignment film makes the liquid crystal molecule of described first liquid crystal layer when being not applied to electric field, and optical axis is parallel to described first direction.The liquid crystal molecule of described first liquid crystal layer is that optical axis direction can be along being parallel to the positivity liquid crystal that direction of an electric field is arranged, and the liquid crystal molecule of described first liquid crystal layer is when being applied in electric field, and optical axis and first direction are angled.
According to embodiments of the invention, the extraordinary ray refractive index of the liquid crystal molecule of described first liquid crystal layer is greater than 1.2 times ordinary refraction index.
According to embodiments of the invention, described concavees lens are a pair of refraction liquid crystal concavees lens, and it comprises one second liquid crystal layer, and this liquid crystal layer comprises the liquid crystal molecule of a plurality of orientations perpendicular to described transparency carrier.
According to embodiments of the invention, described concavees lens are a pair of refraction liquid crystal concavees lens, and it comprises one second liquid crystal layer, and this liquid crystal layer comprises that a plurality of orientations are parallel to the liquid crystal molecule of described transparency carrier.
Compared to prior art, display device of the present invention can see through the liquid crystal molecule rotational angle of driving voltage control liquid crystal convex lens, can change the refringence of the equivalent refractive index of liquid crystal convex lens with the refractive index of this equivalence refractive index of dynamic adjustment and concavees lens.Its purpose is to compensate eye-observation display device distance not simultaneously, the demand of anaclasis angle.In addition, allow the extraordinary ray refractive index of liquid crystal convex lens much larger than ordinary refraction index, when then liquid crystal molecule rotated a few degrees, incident polarized light just obtained bigger variations in refractive index and reaches the purpose that 3D/2D switches.This also represents and need can reach by less electric field once switching a few degrees rotation, can save the consumption of electric power indirectly.
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Embodiment
Below the explanation of each embodiment be with reference to additional graphic, can be in order to illustration the present invention in order to the specific embodiment of enforcement.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side ", " top ", " end ", " level ", " vertically " etc., only be direction with reference to annexed drawings.Therefore, the direction term of use is in order to explanation and understands the present invention, but not in order to restriction the present invention.
See also Fig. 1, Fig. 1 is the synoptic diagram of the display device 100 of demonstration 3-dimensional image of the present invention.When the user watches display device 100, can switch and watch 2D or 3D image.Display device 100 comprises backlight module 102, liquid crystal panel 110, is positioned at the polaroid of liquid crystal panel 110 both sides (polarizer film) 114,115 and liquid crystal lens assembly 120.Backlight module 102 provides uniform surface light source for this liquid crystal panel.Liquid crystal panel 110 provides liquid crystal material between a pair of transparent glass substrate, and (Indium Tin Oxide is ITO) as conductive electrode to lay transparent indium tin oxide on glass substrate.Liquid crystal panel 110 comprises the pel array of being made up of a plurality of pixels 112, the backlight illumination that produces when backlight module 102 can be adjusted the rotation direction of the liquid crystal molecule of corresponding each pixel and shows different GTGs so that adjust the intensity of ejaculation backlight by driving pixel 112 on display panels 110.Liquid crystal panel 110 is between polaroid 114,115, and polaroid 114,115 polarizing axis direction each other differs 90 °.Polaroid 114,115 can make the light of transmission only have corresponding polarizing axis direction according to the angle of its polarizing axis.It is that example describes that the present invention is parallel to the B direction with the polarization of light direction that penetrates from polaroid 115, but is not limited thereto.
See also Fig. 1 to Fig. 3, Fig. 2 is the orientation of liquid crystal molecule and the synoptic diagram of incident polarization light polarization direction.The light path synoptic diagram of polarized light when the liquid crystal molecules of liquid crystal lens assembly 120 in the sectional view of direction shown in Fig. 1 arrow A and convex lens 122 that Fig. 3 illustrates first embodiment of Fig. 1 do not change orientation.Liquid crystal lens assembly 120 from exiting surface 132 to incidence surface 130 comprise transparent glass substrate 121a in regular turn, several are parallel to each other and the strip concavees lens 124 that extend towards first direction A and several are parallel to each other and extend and the strip liquid crystal convex lens 122 of corresponding one by one chimeric concavees lens 124 towards first direction A.Liquid crystal convex lens 122 comprise that a transparency carrier 121b, is positioned at electrode layer 123 and one first liquid crystal layer on the transparent glass substrate 121b, and this first liquid crystal layer is sandwiched between concavees lens 124 and the transparent glass substrate 121b.Each strip concave lens 124 and each strip liquid crystal convex lens 122 are to arrange towards second direction B, and first direction A is perpendicular to one another with second direction B.In another embodiment, liquid crystal lens assembly 120 does not need transparent glass substrate 121a, only need get final product at the bright dipping side coating diaphragm of concavees lens 124.
Electrode layer 123 comprises a plurality of parallel elongate control electrodes, leaves a gap between the two elongated control electrodes.The top of electrode layer 123 can be provided with an alignment film (not shown), and this alignment film is used for making liquid crystal molecule to arrange along specific direction when being not applied to electric field.Liquid crystal convex lens 122 are birefringence convex lens.First liquid crystal layer of liquid crystal convex lens 122 has the first ordinary refraction index n
oWith the first extraordinary ray refractive index n
eOptical axis direction when the polarization direction of the polarized light of incident convex lens 122 perpendicular to liquid crystal molecule, this moment, convex lens 122 had the first ordinary refraction index n for incident polarized light
oWhen the polarization direction of the polarized light of incident convex lens 122 is parallel to the optical axis direction of liquid crystal molecule, this moment, convex lens 122 had the first extraordinary ray refractive index n for incident polarized light
eIn the present embodiment, the refractive index n of concavees lens 124 equals this first ordinary refraction index n
oAs shown in Figure 3, when not bestowed driving voltage between the two elongated control electrodes of electrode layer 123, the orientation meeting of the liquid crystal molecule between this two elongated control electrode because of the effect of alignment film perpendicular to the paper direction.The polarization direction of polarized light of being injected liquid crystal convex lens 122 by polaroid 115 via incidence surface 130 is vertical with the optical axis of liquid crystal molecule.Because the refractive index n of concavees lens 124 equals the first ordinary refraction index n of these liquid crystal convex lens 122
oSo, for the polarized light of injecting liquid crystal convex lens 122, do not have refringence between liquid crystal convex lens 122 and the concavees lens 124, so light can be along rectilinear propagation, so can see the 2D image the observer of exiting surface 132 1 sides.
See also Fig. 4, Fig. 4 illustrates the light path synoptic diagram that the section of liquid crystal lens assembly 120 of first embodiment of Fig. 1 and the liquid crystal molecules in the convex lens 122 change the incident polarized light after the orientation.When being bestowed driving voltage between the two elongated control electrodes of electrode layer 123, the liquid crystal molecule between this two elongated control electrode rotates.From polaroid 115 penetrate the polarization direction of polarized light be an angle θ with the fast axle (promptly vertical direction) of liquid crystal molecule with optical axis, while liquid crystal convex lens 122 have equivalent refractive index n
EffWhen driving voltage increased, this angle θ also can be big more, equals 90 when spending up to angle θ, and for this polarized light, the refractive index of these liquid crystal convex lens 122 is this first extraordinary ray refractive index n
eIn fact, angle θ is at 0 °~90 ° equivalent refractive index n
EffEquivalent refractive index n with 90 °~180 °
EffBe corresponding, for instance, angle θ is at the equivalent refractive index n of 45 ° and 135 °
EffBe identical.That is to say the first ordinary refraction index n
o(angle θ=0 °) and the first extraordinary ray refractive index n
eThe refringence of (angle θ=90 °) is maximum.So equivalent refractive index n of liquid crystal convex lens 122
EffBe between the first ordinary refraction index n
oWith the first extraordinary ray refractive index n
eBetween.Because the equivalent refractive index n of liquid crystal convex lens 122
EffRefractive index n (=n greater than concavees lens 124
o), so this polarized light enters optically thinner medium by optically denser medium, thus the polarized light of injecting can refraction take place at the face that the connects place of liquid crystal convex lens 122 and concavees lens 124 and focus on human eye, so can see the 3D image the observer of exiting surface 132 1 sides.
In addition, present embodiment can be adjusted the driving voltage size between the two elongated control electrodes that put on electrode layer 123, the angle θ between the fast axle of the polarization direction of the feasible polarized light of injecting and liquid crystal molecule and the equivalent refractive index n of liquid crystal convex lens 122
EffAlso adjust thereupon.Thus, the equivalent refractive index n of liquid crystal convex lens 122
EffAlso can change with the refringence of the refractive index n of concavees lens 124, make that the polarized light of injecting is also slightly variant at the refractive direction of liquid crystal convex lens 122 and concavees lens 124.That is to say that the distance between observer and exiting surface 132 is respectively D1 and D2, utilize the mode of adjusting driving voltage to change the equivalent refractive index n of liquid crystal convex lens 122
EffAfter, still can watch clear and lifelike 3D image.In addition, when selecting the liquid crystal material of convex lens 122, can select the first extraordinary ray refractive index n for use
eMuch larger than the first ordinary refraction index n
oLiquid crystal, n for example
e〉=1.2 * n
oAt this moment, as long as minimum driving voltage just can produce certain electric field and rotate special angle by liquid crystal molecule, and make the bigger two-layer lens of incident polarized light process variations in refractive index to allow display device 100 reach the purpose that 2D/3D switches, the therefore consumption that can save electric power.
In Fig. 3, Fig. 4, liquid crystal convex lens 122 adopt the positivity liquid crystal, that is to say that when two elongated control electrodes of electrode layer 123 produced the electric field of direction shown in the arrow B (that is Fig. 1 arrow B) of Fig. 3, the liquid crystal arrangement direction of liquid crystal convex lens 122 was to be parallel to direction of an electric field.In another embodiment, liquid crystal convex lens 122 also can adopt negative liquid crystal.In this embodiment, arranging along the A direction of slender electrode extended along the B direction.
See also Fig. 5, the light path synoptic diagram of polarized light when Fig. 5 illustrates the section of liquid crystal lens assembly 220 of second embodiment and the liquid crystal molecules in the convex lens 222 and do not change orientation.Liquid crystal lens assembly 220 from exiting surface 230 to incidence surface 232 comprise transparent glass substrate 221a in regular turn, several are parallel to each other and the strip liquid crystal concavees lens 224 that extend to extend towards first direction A and several are parallel to each other and extend and the strip liquid crystal convex lens 222 of corresponding one by one chimeric liquid crystal concavees lens 224 towards first direction A.Liquid crystal convex lens 222 comprise a transparency carrier 221b, are positioned at electrode layer 223 and one first liquid crystal layer on the transparent glass substrate 221b, and this first liquid crystal layer is sandwiched between liquid crystal concavees lens 224 and the transparent glass substrate 221b.Each strip liquid crystal concave lens 224 and each strip liquid crystal convex lens 222 are to arrange towards second direction B, and first direction A is perpendicular to one another with second direction B.Be that with the liquid crystal lens assembly 220 difference parts of previous embodiment liquid crystal concavees lens 224 have one second liquid crystal layer.When the optical axis direction of the liquid crystal molecule of this second liquid crystal layer is parallel to the direction of propagation (that is perpendicular to transparency carrier 221b) of incident light, it has the second ordinary refraction index n
O2Liquid crystal convex lens 222 are birefringence convex lens.Birefringence liquid crystal convex lens 222 have the first ordinary refraction index n
O1With the first extraordinary ray refractive index n
E1The second ordinary refraction index n of liquid crystal concavees lens 224
O2Equal this first ordinary refraction index n
O1As shown in Figure 5, when not bestowed driving voltage between the two elongated control electrodes of electrode layer 223, the orientation meeting of the liquid crystal molecule between this two elongated control electrode is perpendicular to the paper direction.This moment is vertical with the optical axis of liquid crystal molecule by the polarization direction of the polarized light that polaroid 115 is injected via incidence surface 230.Because the first ordinary refraction index n of liquid crystal convex lens 222
O1Equal the second ordinary refraction index n of liquid crystal concavees lens 224
O2So, for injecting the polarized light of liquid crystal convex lens 222, do not have refringence between liquid crystal convex lens 222 and the liquid crystal concavees lens 224, so light can be along rectilinear propagation, so can see the 2D image the observer of exiting surface 232 1 sides.
See also Fig. 6, Fig. 6 illustrates the light path synoptic diagram that the section of liquid crystal lens assembly 220 of second embodiment and the liquid crystal molecules in the convex lens 222 change the incident polarized light after the orientation.When being bestowed driving voltage between the two elongated control electrodes of electrode layer 223, the liquid crystal molecule between this two elongated control electrode rotates.The polarization direction of the polarized light that penetrates from polaroid 115 is an angle θ with the fast axle of liquid crystal molecule, and while liquid crystal convex lens 222 have equivalent refractive index n
EffWhen driving voltage increased, this angle θ also can be big more, equals 90 when spending up to angle θ, and for this polarized light, the refractive index of these liquid crystal convex lens 222 is this first extraordinary ray refractive index n
E1The equivalent refractive index n of liquid crystal convex lens 222
EffBe between the first ordinary refraction index n
O1With the first extraordinary ray refractive index n
E1Between.Because the equivalent refractive index n of liquid crystal convex lens 222
EffThe second ordinary refraction index n greater than liquid crystal concavees lens 224
O2(=n
O1), so this polarized light enters optically thinner medium by optically denser medium, thus the polarized light of injecting can take place at the face that the connects place of liquid crystal convex lens 222 and liquid crystal concavees lens 224 refraction and and in to human eye, so can see the 3D image the observer of exiting surface 232 1 sides.
In addition, present embodiment can be adjusted the driving voltage size between the two elongated control electrodes that put on electrode layer 223, the angle θ between the fast axle of the polarization direction of the feasible polarized light of injecting and liquid crystal molecule and the equivalent refractive index n of liquid crystal convex lens 222
EffAlso adjust thereupon.Thus, the equivalent refractive index n of liquid crystal convex lens 222
EffThe second ordinary refraction index n with liquid crystal concavees lens 224
O2Refringence also can change, make that the polarized light inject is also slightly variant at the refractive direction of liquid crystal convex lens 222 and liquid crystal concavees lens 224.That is to say that the distance between observer and exiting surface 232 is respectively D1 and D2, utilize the mode of adjusting driving voltage to change the equivalent refractive index n of liquid crystal convex lens 222
EffAfter, still can watch clear and lifelike 3D image.In addition, when selecting the liquid crystal material of convex lens 222, can select the first extraordinary ray refractive index n for use
E1Much larger than the first ordinary refraction index n
O1Liquid crystal, n for example
E1〉=1.2 * n
O1At this moment, as long as minimum driving voltage just can produce certain electric field and rotate special angle by liquid crystal molecule, incident polarized light just through the bigger two-layer lens of variations in refractive index allowing display device 100 reach the purpose that 3D/2D switches, the therefore consumption that can save electric power.
In Fig. 5, Fig. 6, liquid crystal convex lens 222 adopt the positivity liquid crystal, that is to say that when two elongated control electrodes of electrode layer 223 produced the electric field of direction shown in the arrow B (that is Fig. 1 arrow B) of Fig. 5, the liquid crystal arrangement direction of liquid crystal convex lens 222 was to be parallel to direction of an electric field.In another embodiment, liquid crystal convex lens 222 also can adopt negative liquid crystal, and in this embodiment, arranging along the A direction of slender electrode extended along the B direction.
See also Fig. 7 and Fig. 8, the light path synoptic diagram of polarized light when Fig. 7 illustrates the section of liquid crystal lens assembly 320 of the 3rd embodiment and the liquid crystal molecules in the convex lens 222 and do not change orientation.Fig. 8 illustrates the light path synoptic diagram that the section of liquid crystal lens assembly 320 of the 3rd embodiment and the liquid crystal molecules in the convex lens 222 change the incident polarized light after the orientation.The assembly that Fig. 7 and Fig. 8 indicated and Fig. 5 and Fig. 6 have same numeral person, its function is identical, does not give unnecessary details in addition at this.Second liquid crystal layer of the birefringence liquid crystal concavees lens 224 of liquid crystal lens assembly 320 comprises that a plurality of orientations are parallel to the liquid crystal molecule of transparency carrier 221b, and just the optical axis direction of liquid crystal molecule is parallel to the polarization of incident light direction.For this polarized light, it has the second extraordinary ray refractive index n
E2Liquid crystal lens assembly 320 is that with the difference of liquid crystal lens assembly 220 refractive index of the liquid crystal concavees lens 224 of liquid crystal lens assembly 320 is fixed as this second extraordinary ray refractive index n
E2When showing stereopsis, as long as select the first ordinary refraction index n of liquid crystal convex lens 222
O1Equal the second extraordinary ray refractive index n
E2, adjust the equivalent refractive index n of liquid crystal convex lens 222 afterwards
EffBetween the first ordinary refraction index n
O1With the first extraordinary ray refractive index n
E1Between get final product.That is to say, as the equivalent refractive index n of liquid crystal convex lens 222
EffBe matched with the second extraordinary ray refractive index n of liquid crystal concavees lens 224
E2, then do not have refringence between liquid crystal convex lens 222 and the liquid crystal concavees lens 224, so light can be along rectilinear propagation, so can see the 2D image the observer of exiting surface 232 1 sides.Equivalent refractive index n when liquid crystal convex lens 222
EffThe second extraordinary ray refractive index n greater than liquid crystal concavees lens 224
E2The time, this polarized light enters optically thinner medium by optically denser medium, and refraction can take place at the face that the connects place of liquid crystal convex lens 222 and liquid crystal concavees lens 224 and focus on human eye in the polarized light of injecting, so can see the 3D image the observer of exiting surface 232 1 sides.
In sum; though the present invention discloses as above with preferred embodiment; but this preferred embodiment is not in order to restriction the present invention; the those of ordinary skill in this field; without departing from the spirit and scope of the present invention; all can do various changes and retouching, so protection scope of the present invention is as the criterion with the scope that claim defines.