CN102799019B - Blue-phase liquid crystal display device and production method thereof - Google Patents
Blue-phase liquid crystal display device and production method thereof Download PDFInfo
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- CN102799019B CN102799019B CN201210286366.0A CN201210286366A CN102799019B CN 102799019 B CN102799019 B CN 102799019B CN 201210286366 A CN201210286366 A CN 201210286366A CN 102799019 B CN102799019 B CN 102799019B
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Abstract
The invention provides a blue-phase liquid crystal display device, which comprises a first substrate, a second substrate which is opposite to the first substrate and a blue-phase liquid crystal layer which is arranged between the first substrate and the second substrate, wherein the first substrate comprises a first transparent insulation layer, a first glass substrate and a first polarizer, the first transparent insulation layer is arranged at the side of the first glass substrate to be close to the blue-phase liquid crystal layer, and the first polarizer is arranged at the side of the first glass substrate to be away from the blue-phase liquid crystal layer; the second substrate comprises a second transparent insulation layer, a second glass substrate and a second polarizer, wherein the second transparent insulation layer is arranged at the side of the second glass substrate to be close to the blue-phase liquid crystal layer, and the second polarizer is arranged at the side of the second glass substrate to be away from the blue-phase liquid crystal layer; and the blue-phase liquid crystal display device also comprises at least two oblique electrodes, wherein the oblique electrodes are obliquely arranged between the first substrate and the second substrate and penetrate the blue-phase liquid crystal layer. The blue-phase liquid crystal display device can reach high transmittance under low driving voltage.
Description
Technical field
The present invention relates to display technique field, particularly a kind of blue phase liquid crystal display and preparation method thereof of low driving voltage high permeability.
Background technology
In recent years, along with the development of display technique, liquid crystal display is applied in the display device as the Portable movable such as smart mobile phone, panel computer electronic product more and more widely.
The liquid crystal that traditional liquid crystal display adopts is divided into nematic phase, smectic phase and cholesteric phase three kinds; for fast moving scenes; traditional liquid crystal display there will be the phenomenon such as streaking and dynamic fuzzy usually, and its main cause caused not soon due to the response time of liquid crystal molecule.
Compared with now widely used liquid crystal display liquid crystal material, blue phase liquid crystal has following four outstanding advantages: the response time of (1) blue phase liquid crystal is within the scope of sub-millisecond, it is without the need to adopting overdrive technique (Over Drive), namely can realize the high-speed driving of more than 240Hz, thus effectively can reduce the dynamic fuzzy of moving image.When adopting red-green-blue light emitting diode (RGB-LED) to do backlight, without the need to color filter film, utilize blue phase liquid crystal namely can realize the display of field sequential color sequential; (2) blue phase liquid crystal does not need the necessary oriented layer of other various display mode, not only simplifies manufacturing process, also reduces cost; (3) macroscopically, blue phase liquid crystal is optically isotropic, thus blue phase liquid crystal display device is had visual angle is wide, dark-state is good feature; (4) as long as the thick penetration depth exceeding electric field of blue phase liquid crystal box box, the change that liquid crystal cell box is thick just can be ignored the impact of transmissivity, and this characteristic is particularly suitable for manufacturing giant-screen or veneer liquid crystal indicator.
Figure 1 shows that the structural representation of existing blue phase liquid crystal display.As shown in Figure 1, in existing blue phase liquid crystal display, blue phase liquid crystal layer 16 is between top glass substrate 11 and lower glass substrate 12, lower glass substrate 12 upper surface is provided with strip shaped electric poles 13, is respectively arranged with polaroid 14 and lower polaroid 15 in the downside of the upside of top glass substrate 11 and lower glass substrate 12.In the structure of existing blue phase liquid crystal display, the transverse electric field of its strip shaped electric poles 13 upper area is very weak, space above its electrode is very little to the contribution of light penetration, therefore the penetrance of blue phase liquid crystal display mainly relies on horizontal electric field component in the electric field produced between strip shaped electric poles 13 to decide, therefore the transmitance of existing blue phase liquid crystal display is lower, generally only has about 60%.In the prior art, in order to obtain higher penetrance, the general driving voltage by improving blue phase liquid crystal display, or by reducing the spacing between strip shaped electric poles 13, improve the penetrance of blue phase liquid crystal display.
Figure 2 shows that the blue phase liquid crystal display of the trapezoidal electrode structure of existing employing, as shown in Figure 2, its electrode structure adopts trapezoidal electrode 23.In this blue phase liquid crystal display, because trapezoidal electrode 23 has certain altitude, so the horizontal component of electric field near top glass substrate 21 can be strengthened, thus reduce driving voltage to a certain extent.But in the blue phase liquid crystal display shown in Fig. 2, trapezoidal electrode 23 is arranged in lower glass substrate 22, and therefore, its penetrance is still lower.
Figure 3 shows that the blue phase liquid crystal display of existing employing wall shape electrode structure, as shown in Figure 3, its electrode structure adopts wall shape electrode 33.In this blue phase liquid crystal display, also there is stronger horizontal component of electric field, so effectively reduce driving voltage near top glass substrate 31 place.But, because wall shape electrode 33 runs through whole blue phase liquid crystal layer 36, so the region at wall shape electrode 33 place does not have liquid crystal molecule completely, do not have light transmission, therefore still cannot substantially improve its transmitance.
Summary of the invention
Based on the problem that driving voltage is high, transmitance is low existing in existing blue phase liquid crystal display, the invention provides one can effectively reduce its driving voltage, and it can be kept again to have blue phase liquid crystal display compared with high permeability.
The present invention proposes a kind of blue phase liquid crystal display, comprise the second substrate that first substrate and described first substrate are oppositely arranged and the blue phase liquid crystal layer be arranged between described first substrate and described second substrate, wherein, described first substrate comprises the first transparent insulating layer, the first glass substrate, the first polaroid, described first transparent insulating layer is positioned at the side of the first glass substrate near described blue phase liquid crystal layer, and described first polaroid is positioned at the side of the first glass substrate away from described blue phase liquid crystal layer; Described second substrate comprises the second transparent insulating layer, the second glass substrate, the second polaroid, described second transparent insulating layer is positioned at the side of the second glass substrate near described blue phase liquid crystal layer, and described second polaroid is positioned at the side of the second glass substrate away from described blue phase liquid crystal layer; Described blue phase liquid crystal display also comprises at least two oblique electrodes, and described oblique electrode incline to be arranged between described first substrate and described second substrate and to run through described blue phase liquid crystal layer.
Further, in described blue phase liquid crystal display, each oblique electrode comprises the first extension, the second extension, is connected to electrode section between the first extension and the second extension, described first extension of each oblique electrode is attached at the lower surface of the first transparent insulating layer, and described second extension is attached at the upper surface of the second transparent insulating layer 421.
Further, the first extension described in described blue phase liquid crystal display and the second extension and described electrode section form obtuse angle or acute angle.
Further, the spacing of described electrode section on described first substrate of two adjacent in described blue phase liquid crystal display oblique electrodes is 2 μm to 6 μm with the scope of the difference of the spacing on described second substrate.
Further, in two oblique electrodes that described blue phase liquid crystal display is adjacent, an oblique electrode tilts along first direction, and the oblique electrode of another one tilts along second direction, and first direction and second direction are relative to the direction symmetry perpendicular to first substrate or second substrate.
Further, in described blue phase liquid crystal display, each oblique electrode includes transparent electrode layer and is coated on the 3rd transparent insulating layer outside described transparent electrode layer.
Further, the thickness range of the 3rd transparent insulating layer described in described blue phase liquid crystal display is 0.3 μm to 2 μm, and the thickness range of described transparent electrode layer is 0.3 μm to 4 μm.
Further, the edge placement described in described blue phase liquid crystal display between first substrate and described second substrate is also provided with column spacer.
Present invention also offers a kind of manufacture method of blue phase liquid crystal display, it comprises:
Form at least two oblique electrodes on a substrate; At the circumfusion blue phase liquid crystal of oblique electrode, the height of the blue phase liquid crystal poured into equals the height of oblique electrode, is cured formation blue phase liquid crystal layer; Blue phase liquid crystal layer is formed another substrate.
Further, the described step forming at least two oblique electrodes on a substrate comprises:
Apply the first photoresist layer on the substrate, and cover the first mask plate, utilize ultraviolet light to carry out oblique irradiation along first direction, irradiated first photoresist layer is softened; Take off the first mask plate, cover the second mask plate, the position that second mask plate is placed with the first mask plate does not overlap, oblique irradiation is carried out along second direction with ultraviolet light, irradiated first photoresist layer is softened, and described second direction and described first direction are relative to the direction symmetry perpendicular to described substrate; Peel off the part that the first photoresist layer is softened, form the groove of inverted trapezoidal and trapezoidal projection, on remaining first photoresist layer, apply the 3rd transparent insulating layer Part I and transparent electrode layer successively; Apply the second photoresist layer, on the second photoresist layer, cover the 3rd mask plate, utilize the 3rd mask plate to expose and the lower end middle section of inverted trapezoidal groove and second photoresist layer corresponding with the upper-center region of trapezoidal protrusion; Take off the 3rd mask plate and peel off the part that the second photoresist layer is exposed, expose transparent electrode layer, etch away the transparent electrode layer be exposed out, expose the Part I of the 3rd transparent insulating layer, ultraviolet light is utilized vertically to irradiate, remaining first photoresist layer and the second photoresist layer are softened, peels off remaining second photoresist layer; Again apply the Part II of the 3rd transparent insulating layer, the Part II covering transparent electrode layer of the 3rd transparent insulating layer again applied also contacts with the Part I of the 3rd transparent insulating layer exposed; Apply the 3rd photoresist layer, cover the 4th mask plate, use ultraviolet light vertically to irradiate, irradiated 3rd photoresist layer is softened, peel off the part that the 3rd photoresist layer is softened, expose the 3rd transparent insulating layer, etch away the 3rd transparent insulating layer be exposed out; Utilize ultraviolet light vertically to irradiate, the 3rd photoresist layer is softened, peel off the first photoresist layer after softening and the 3rd photoresist layer, form oblique electrode.
Relative to prior art, the invention has the beneficial effects as follows: blue phase liquid crystal display of the present invention can reach very high transmitance under lower driving voltage.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing blue phase liquid crystal display;
Fig. 2 is the structural representation of the blue phase liquid crystal display of the trapezoidal electrode structure of existing employing;
Fig. 3 is the structural representation of the blue phase liquid crystal display of existing employing wall shape electrode structure;
Fig. 4 is the perspective view of the blue phase liquid crystal display in first embodiment of the invention;
Fig. 5 is the part section structural representation of blue phase liquid crystal display in Fig. 4;
Fig. 6 is the structural representation of the blue phase liquid crystal display in another embodiment of the present invention;
Fig. 7 to Figure 27 is the method for making schematic diagram of blue phase liquid crystal display in the present invention;
Figure 28 is the transmitance of the blue phase liquid crystal display in first embodiment of the invention when adopting single TFT to drive and driving voltage graph of a relation;
Transmitance when Figure 29 is the blue phase liquid crystal display employing double T FT driving in first embodiment of the invention and driving voltage graph of a relation.
Embodiment
Reaching for further setting forth the present invention the technological means and effect that predetermined goal of the invention takes, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of blue phase liquid crystal display proposed according to the present invention and effect, being described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can clearly present in following cooperation describes in detail with reference to graphic preferred embodiment.By the explanation of embodiment, when can to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, however institute's accompanying drawing be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Figure 4 shows that the perspective view of the blue phase liquid crystal display in first embodiment of the invention, as shown in Figure 4, in the present embodiment, this blue phase liquid crystal display comprises first substrate 41, second substrate 42, blue phase liquid crystal layer 43 and multiple oblique electrode 44.In the present embodiment, first substrate 41 and second substrate 42 be arranged in parallel.Wherein, in adjacent two oblique electrodes 44, an oblique electrode 44 tilts along first direction, the oblique electrode 44 of another one tilts along second direction, first direction is different from the direction of second direction, under preferable case, the angle of first direction and vertical direction equals the angle of second direction and vertical direction, and that is first direction and second direction are relative to the direction symmetry perpendicular to first substrate 41 or second substrate 42.
In the present invention, the quantity of oblique electrode 44 can design according to the actual needs such as display sizes, resolution.Wherein, in adjacent two oblique electrodes 44, an oblique electrode forms pixel (Pixel) electrode, and the oblique electrode of another one forms public (Common) electrode.Blue phase liquid crystal layer 43 is between first substrate 41 and second substrate 42.Oblique electrode 44 is inclined between first substrate 41 and second substrate 42 on the whole, and runs through blue phase liquid crystal layer 43.First substrate 41 can pass through together with edge banding frame glue bond (not illustrating edge banding frame glue in figure) with second substrate 42.Preferably, the material of blue phase liquid crystal layer 43 is blue phase liquid crystal polymkeric substance, and its thickness preferable range is 5 μm to 20 μm.
Further, can be supported by multiple column spacer 45 between first substrate 41 and second substrate 42, the height of column spacer 45 is the thickness of blue phase liquid crystal layer 43.Preferably, column spacer 45 is positioned at the edge placement of first substrate 41 and second substrate 42, to avoid stopping to transmitted light.
Fig. 5 is the part section structural representation of blue phase liquid crystal display in Fig. 4.As shown in Figure 5, in the blue phase liquid crystal display shown in the present embodiment, first substrate 41 comprises the first transparent insulating layer 411, first glass substrate 412, first polaroid 413, first transparent insulating layer 411 is positioned at the first glass substrate 412 near the side of blue phase liquid crystal layer 43, and the first polaroid 413 is positioned at the side of the first glass substrate 412 away from blue phase liquid crystal layer 43; Second substrate 42 comprises the second transparent insulating layer 421, second glass substrate 422, second polaroid 423, second transparent insulating layer 421 is positioned at the second glass substrate 412 near the side of blue phase liquid crystal layer 43, and the second polaroid 423 is positioned at the side of the second glass substrate 412 away from blue phase liquid crystal layer 43.Namely blue phase liquid crystal layer 43 is between the first transparent insulating layer 411 and the second transparent insulating layer 421, and in the present invention, the first transparent insulating layer 411 and the second transparent insulating layer 421 all can adopt silicon dioxide (SiO
2) etc. insulation transparent material make, thickness be all preferably 0.3mm.Wherein a slice in first polaroid 413 and the second polaroid 423 is the polarizer, and another sheet is analyzer.Such as the second polaroid 423 is the polarizer, and its light transmission shaft is preferably 45 °, and the first polaroid 413 is analyzer, its light transmission shaft is preferably 135 °, certainly, the present invention is not limited with above-mentioned angle, and the first polaroid 413 is preferably mutually vertical with the light transmission shaft of the second polaroid 423.
In the present embodiment, after each oblique electrode 44 runs through blue phase liquid crystal layer 43, contact with the first transparent insulating layer 411 and the second transparent insulating layer 421 respectively.Particularly, each oblique electrode 44 electrode section 44c of including the first extension 44a, the second extension 44b and being connected between the first extension 44a and the second extension 44b.In the present embodiment, the first extension 44a, the second extension 44b and electrode section 44c of each oblique electrode 44 are tabular.And the first extension 44a of each oblique electrode 44 is attached at the lower surface of the first transparent insulating layer 411, the second extension 44b is attached at the upper surface of the second transparent insulating layer 421.In the present embodiment, the first extension 44a and the second extension 44b is that electrode section 44c provides supporting construction, to ensure that electrode section 44c can be arranged in blue phase liquid crystal layer 43 with heeling condition.In concrete enforcement, the length of the first extension 44a and the second extension 44b can be selected according to actual needs, and being as the criterion by support electrode portion 44c, the present invention is not as limit.In the present embodiment, the angle of the first extension 44a and the second extension 44b and electrode section 44c is obtuse angle.Certainly, in other embodiments of the present invention, the angle of the first extension 44a and the second extension 44b and electrode section 44c also as shown in Figure 6, can be acute angle, and the present invention is not as limit.
In the present embodiment, in adjacent two oblique electrodes 44, an oblique electrode 44 tilts along first direction, and the oblique electrode 44 of another one tilts along second direction, and first direction is different from the direction of second direction.The difference of the electrode section 44c of adjacent two oblique electrodes 44 spacing on first substrate 41 and the spacing on second substrate 42 range preferably from 2 μm to 6 μm.It should be noted that, here and two adjacent oblique electrodes 44 above-mentioned comprise following two kinds of situations, for the oblique electrode 44 of three shown in Fig. 5, the oblique electrode adjacent with being positioned at middle oblique electrode 44 not only can be oblique electrode 44 on the left of it but also can be the oblique electrode 44 on the right side of it.Be positioned at middle oblique electrode 44 if chosen and be positioned at the oblique electrode 44 in left side as adjacent two oblique electrodes, so, this is to large 2 μm to 6 μm of the spacing of gap ratio on second substrate 42 of the electrode section 44c of adjacent two oblique electrodes 44 on first substrate 41.Be positioned at middle oblique electrode 44 if chosen and be positioned at the oblique electrode 44 on right side as adjacent two oblique electrodes, so, this is little 2 μm to 6 μm to the gap ratio spacing on second substrate 42 of the electrode section 44c of adjacent two oblique electrodes 44 on first substrate 41." two adjacent oblique electrodes " described in the present invention at least comprise the wherein a kind of of above-mentioned two situations.
Preferably, the scope that adjacent two oblique electrodes 44 are being positioned at the spacing on the reference surface in the middle of first substrate 41 and second substrate 42 is 4 μm to 12 μm, and this reference surface is to be positioned in the middle of first substrate 41 and second substrate 42 and to be parallel to the virtual plane of first substrate 41 and second substrate 42.
Each oblique electrode 44 is formed by the 3rd transparent insulating layer 441 and transparent electrode layer 443, and the 3rd transparent insulating layer 441 is coated on the outside surface of transparent electrode layer 443, can adopt silicon dioxide (SiO
2) etc. transparent insulation material make.
Preferably, the thickness range of the 3rd transparent insulating layer 441 is preferably 0.3 μm to 2 μm.Transparent electrode layer 443 preferably adopts indium tin oxide (Indium Tin Oxides is called for short ITO) electrode.Preferably, the thickness range of transparent electrode layer 443 is 0.3 μm to 4 μm.Wherein, the thickness of each oblique electrode 44 is preferably 2.5mm.
Be the method for making of the blue phase liquid crystal display in the present embodiment below, it should be noted that, in the present invention, the method for making of blue phase liquid crystal display can adopt but be not limited to make according to following steps.In addition, in order to clearly the present invention will be described, concrete data parameters is given in this method for making, but for a person skilled in the art, concrete data parameters in this method for making should not be construed as the restriction to method for making in the present invention, all data parameters involved in the present invention can suitably change, and repeat no more.
Fig. 7 to Figure 27 is the method for making schematic diagram of blue phase liquid crystal display in the present invention.
In the present invention, the method for making of blue phase liquid crystal display comprises:
Step 1, second substrate 41 is formed at least two oblique electrodes 44.
Wherein, step 1 comprises:
As shown in Figure 7, above the second insulation course 421 of second substrate 41, evenly apply the first photoresist layer 51, thickness is such as about 20 μm.
Then, as shown in Figure 8, the first mask plate 52 is covered on the first photoresist layer 51, first mask plate 52 comprises uniform striped-shaped mask array 521, gap width between every two adjacent striped-shaped mask is such as 8 μm, the width of each striped-shaped mask is such as 10 μm, then uses ultraviolet light (UV light) to carry out oblique irradiation along first direction, and irradiated first photoresist layer 51 is softened.
As shown in Figure 9, take off the first mask plate 52, cover the second mask plate 53, wherein, second mask plate 53 is identical with the structure of the first mask plate 52, namely the gap width in the second mask plate 53 between every two adjacent striped-shaped mask is such as also 8 μm, and the width of each striped-shaped mask is such as also 10 μm.But the second mask plate 53 is different from the position that the first mask plate 52 is placed, the placement location of itself and the first mask plate 52 staggers certain distance, such as, be 4 μm.After the second mask plate 53 has been placed, carry out oblique irradiation with UV light along second direction, irradiated first photoresist layer 51 is softened.In the present invention, first direction is different from the direction of second direction, under preferable case, the angle of first direction and vertical direction equals the angle of second direction and vertical direction, and that is first direction and second direction are relative to the direction symmetry perpendicular to first substrate 41 or second substrate 42.
Then, as shown in Figure 10, peel off the part that the first photoresist layer 51 is softened, remaining photoresist forms the inverted trapezoidal groove that upper end width is 12 μm, lower end width is 8 μm, and upper end width be 6 μm, lower end width is the trapezoidal protrusion of 10 μm.
As shown in figure 11, Part I 54 and the transparent electrode layer 55 of the 3rd transparent insulating layer is applied successively on remaining first photoresist layer, the thickness of the Part I 54 of the 3rd transparent insulating layer is such as 0.3 μm, and the thickness of transparent electrode layer 55 is such as about 0.4 μm.
As shown in figure 12, apply the second photoresist layer 56, fill up the region above transparent electrode layer 55.
As shown in figure 13, the 3rd mask plate 57 is covered on the second photoresist layer 56,3rd mask plate 57 comprises uniform striped-shaped mask array 571, gap width between every two adjacent striped-shaped mask is such as 4 μm, the width of each striped-shaped mask is such as 5 μm, each gap correspondence is arranged at the lower end middle section of inverted trapezoidal groove or the upper-center region of trapezoidal protrusion, vertically irradiates with UV light, and the second photoresist layer 56 is softened.
As shown in figure 14, take off the 3rd mask plate 57 and peel off the part that the second photoresist layer 56 is softened, exposing transparent electrode layer 55.
As shown in figure 15, the transparent electrode layer 55 utilizing wet etch method to etch away to be exposed out, exposes the Part I 54 of the 3rd transparent insulating layer.
As shown in figure 16, do not use mask plate, UV light is directly utilized vertically to irradiate, remaining first photoresist layer 51 and the second photoresist layer 56 are softened, it should be noted that, because the Part I 54 of the 3rd insulation course is transparent, so UV light can be irradiated to the first photoresist layer 51 through the Part I 54 of the 3rd transparent insulating layer.
As shown in figure 17, remaining second photoresist layer 56 is peeled off.
As shown in figure 18, apply the Part II 58 of the 3rd transparent insulating layer, thickness is such as about 0.3 μm, insulation course 58 covering transparent electrode layer 55 Part I 54 in the 3rd transparent insulating layer exposed contact, therefore, transparent electrode layer 55 is coated by the Part II 58 of the Part I 54 of the 3rd transparent insulating layer and the 3rd transparent insulating layer.The Part I 54 of the 3rd transparent insulating layer and Part II 58 form the 3rd transparent insulating layer.
As shown in figure 19, coating the 3rd photoresist layer 59, fills up the region on Part II 58 top of the 3rd insulation course.
As shown in figure 20, cover the 4th mask plate 60, UV light is used vertically to irradiate, irradiated 3rd photoresist layer 59 is softened, 4th mask plate 60 and the 3rd mask plate 57 unlike, gap width between every two adjacent striped-shaped mask is such as 2 μm, and the width of each striped-shaped mask is such as 7 μm, and each gap is also corresponding is arranged at the lower end middle section of inverted trapezoidal groove or the upper-center region of trapezoidal protrusion.
As shown in figure 21, peel off the part that the 3rd photoresist layer 59 is softened, expose the Part II 58 of the 3rd transparent insulating layer.
As shown in figure 22, dry carving technology is used to carve the Part I 54 of the Part II 58 of the 3rd transparent insulating layer and the 3rd transparent insulating layer of correspondence falling to be exposed out.
As shown in figure 23, do not use mask plate, directly utilize UV light vertically to irradiate, the 3rd photoresist layer 59 and the first photoresist layer 51 are softened.
As shown in figure 24, peel off the first photoresist layer 51 after softening and the 3rd photoresist layer 59, form the oblique electrode 44 in the above embodiment of the present invention.
Step 2, at the circumfusion blue phase liquid crystal of oblique electrode, the height of the blue phase liquid crystal poured into equals the height of oblique electrode, is cured and forms blue phase liquid crystal layer 43.
In step 2, comprise, as shown in figure 25, ODF technology is utilized to drip to oblique electrode equably the blue phase liquid crystal material mixed, then, as shown in figure 26, using UV light to carry out irradiation makes blue phase liquid crystal material solidify, and forms the blue phase liquid crystal layer 43 in above-described embodiment.
Step 3, blue phase liquid crystal layer forms first substrate.
First glass substrate and the second glass substrate are carried out contraposition laminating, and seals with edge banding frame glue.Outside the first glass substrate, attach the first polaroid, outside the second glass substrate, attach the second polaroid.Obtain the blue phase liquid crystal display in the present embodiment.
Oblique electrode 44 in the present embodiment is owing to being run through blue phase liquid crystal layer 43, so when compared with low driving voltage, also very strong horizontal component of electric field can be formed near first substrate 41 place, and due to horizontal component of electric field to raising transmitance have contribution, so blue phase liquid crystal display of the present invention has higher transmitance.In addition, due to the characteristic that electrode is oblique structure, also have liquid crystal molecule in the region at oblique electrode 44 place and produce birefringence under electric field action, and oblique electrode 44 itself is transparent material, so also have light transmission in oblique electrode 44 region, especially relative to the blue phase liquid crystal display of existing wall shape electrode structure, the transmitance of entirety of the present invention can be significantly improved.
The blue phase liquid crystal display proposed below by the experimental verification embodiment of the present invention can reach very high transmitance under lower driving voltage.
Suppose in the present embodiment, the spacing of two adjacent oblique electrodes 44 on first substrate 41 of blue phase liquid crystal display is 4 μm with the scope of the difference of the spacing on second substrate 42.The thickness of the transparent electrode layer 443 of each oblique electrode 44 is 0.5 μm, and the 3rd transparent insulating layer 441 thickness is 1 μm.Adjacent two oblique electrodes 44 are 8 μm what be positioned at the spacing on first substrate 41 reference surface middle with second substrate 42.The thickness of blue phase liquid crystal layer 43 is 20 μm.The material parameter of blue phase liquid crystal layer 43 is ε
//=37, ε
⊥=4, n
o=1.4744, n
e=1.7744, K=12.68nm/V
2(λ=550nm).First polaroid 413 and the second polaroid 423 all adopt G1220DU model polaroid.Second polaroid 423 is the polarizer, and its light transmission shaft is 45 °, and the first polaroid 413 is analyzer, and its light transmission shaft is 135 °.Figure 28 adopts single-film field effect transistor (Thin Film Transistor with this understanding, be called for short TFT) drive, namely on one of them oblique electrode of adjacent two oblique electrodes 44, driving voltage is applied, the transmitance that another oblique electrode obtains after zero setting and the graph of a relation of driving voltage.Figure 29 adopts double T FT to drive with this understanding, namely an oblique electrode applies positive driving voltage wherein, the transmitance obtained after another oblique ITO electrode applying negative driving voltage and the graph of a relation of driving voltage.From Figure 28 and Figure 29, blue phase liquid crystal display of the present invention (use driving voltage during single TFT driving method to be 11V, driving voltage when adopting double T FT driving method is 5.5V) under lower driving voltage just can reach very high transmitance (93%).
Above-mentioned two adjacent oblique electrodes 44 are symmetrically set and are only the present invention's preferably a kind of frame mode; but the present invention is not limited to this; as long as can make after applying external drive voltage; the liquid crystal region at oblique electrode place also has light transmission; thus the penetrance of blue phase liquid crystal display can be ensured while reducing driving voltage; protection thought all according to the invention, repeats no more.
In sum, oblique electrode in the present invention is owing to having run through blue phase liquid crystal layer, so when compared with low driving voltage, also very strong horizontal component of electric field can be formed near first substrate place, and due to horizontal component of electric field to raising transmitance have contribution, so blue phase liquid crystal display of the present invention has higher transmitance.In addition, due to the characteristic that electrode is oblique structure, also have liquid crystal molecule in oblique electrode region and produce birefringence under electric field action, and oblique electrode itself is transparent material, so also have light transmission on the direction that oblique electrode vertical projects, especially relative to the blue phase liquid crystal display of existing wall shape electrode structure, the transmitance of entirety of the present invention can be significantly improved.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (8)
1. a blue phase liquid crystal display, comprises the second substrate that first substrate and described first substrate are oppositely arranged and the blue phase liquid crystal layer be arranged between described first substrate and described second substrate, it is characterized in that,
Described first substrate comprises the first transparent insulating layer, the first glass substrate, the first polaroid, described first transparent insulating layer is positioned at the side of the first glass substrate near described blue phase liquid crystal layer, and described first polaroid is positioned at the side of the first glass substrate away from described blue phase liquid crystal layer;
Described second substrate comprises the second transparent insulating layer, the second glass substrate, the second polaroid, described second transparent insulating layer is positioned at the side of the second glass substrate near described blue phase liquid crystal layer, and described second polaroid is positioned at the side of the second glass substrate away from described blue phase liquid crystal layer;
Described blue phase liquid crystal display also comprises at least two oblique electrodes, described oblique electrode incline to be arranged between described first substrate and described second substrate and to run through described blue phase liquid crystal layer, in adjacent two oblique electrodes, an oblique electrode tilts along first direction, the oblique electrode of another one tilts along second direction, and first direction and second direction are relative to the direction symmetry perpendicular to first substrate or second substrate.
2. blue phase liquid crystal display as claimed in claim 1, it is characterized in that, each oblique electrode comprises the first extension, the second extension, is connected to electrode section between the first extension and the second extension, described first extension of each oblique electrode is attached at the lower surface of the first transparent insulating layer, and described second extension is attached at the upper surface of the second transparent insulating layer.
3. blue phase liquid crystal display as claimed in claim 2, is characterized in that, described first extension and the second extension and described electrode section form obtuse angle or acute angle.
4. blue phase liquid crystal display as claimed in claim 2, is characterized in that, the spacing of described electrode section on described first substrate of two adjacent oblique electrodes is 2 μm to 6 μm with the scope of the difference of the spacing on described second substrate.
5. the blue phase liquid crystal display according to any one of Claims 1 to 4, is characterized in that, each oblique electrode includes transparent electrode layer and is coated on the 3rd transparent insulating layer outside described transparent electrode layer.
6. blue phase liquid crystal display as claimed in claim 5, it is characterized in that, the thickness range of described 3rd transparent insulating layer is 0.3 μm to 2 μm, and the thickness range of described transparent electrode layer is 0.3 μm to 4 μm.
7. blue phase liquid crystal display as claimed in claim 1, it is characterized in that, the edge placement between described first substrate and described second substrate is also provided with column spacer.
8. a manufacture method for blue phase liquid crystal display, is characterized in that, comprising:
Apply the first photoresist layer on a substrate, and cover the first mask plate, utilize ultraviolet light to carry out oblique irradiation along first direction, irradiated first photoresist layer is softened;
Take off the first mask plate, cover the second mask plate, the position that second mask plate is placed with the first mask plate does not overlap, oblique irradiation is carried out along second direction with ultraviolet light, irradiated first photoresist layer is softened, and described second direction and described first direction are relative to the direction symmetry perpendicular to described substrate;
Peel off the part that the first photoresist layer is softened, form the groove of inverted trapezoidal and trapezoidal projection, on remaining first photoresist layer, apply the 3rd transparent insulating layer Part I and transparent electrode layer successively;
Apply the second photoresist layer, on the second photoresist layer, cover the 3rd mask plate, utilize the 3rd mask plate to expose and the lower end middle section of inverted trapezoidal groove and second photoresist layer corresponding with the upper-center region of trapezoidal protrusion;
Take off the 3rd mask plate and peel off the part that the second photoresist layer is exposed, expose transparent electrode layer, etch away the transparent electrode layer be exposed out, expose the Part I of the 3rd transparent insulating layer, ultraviolet light is utilized vertically to irradiate, remaining first photoresist layer and the second photoresist layer are softened, peels off remaining second photoresist layer;
Again apply the Part II of the 3rd transparent insulating layer, the Part II covering transparent electrode layer of the 3rd transparent insulating layer again applied also contacts with the Part I of the 3rd transparent insulating layer exposed;
Apply the 3rd photoresist layer, cover the 4th mask plate, use ultraviolet light vertically to irradiate, irradiated 3rd photoresist layer is softened, peel off the part that the 3rd photoresist layer is softened, expose the 3rd transparent insulating layer, etch away the 3rd transparent insulating layer be exposed out;
Utilize ultraviolet light vertically to irradiate, the 3rd photoresist layer is softened, peel off the first photoresist layer after softening and the 3rd photoresist layer, form at least two oblique electrodes;
At the circumfusion blue phase liquid crystal of oblique electrode, the height of the blue phase liquid crystal poured into equals the height of oblique electrode, is cured formation blue phase liquid crystal layer;
Blue phase liquid crystal layer is formed another substrate.
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| CN103529601B (en) * | 2013-11-08 | 2016-02-03 | 河北工业大学 | The blue phase liquid crystal display of low driving voltage high permeability |
| US20170097530A1 (en) * | 2015-10-01 | 2017-04-06 | Au Optronics Corporation | Photo-conversion means for liquid crystal displays |
| CN107272294B (en) * | 2017-07-10 | 2020-08-18 | 华南师范大学 | Electric control intelligent window, preparation method and light adjusting method |
| CN114185194B (en) * | 2021-12-09 | 2023-09-15 | 中国科学院重庆绿色智能技术研究院 | Geometric phase liquid crystal space light complex amplitude modulator |
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| CN102012588A (en) * | 2010-12-16 | 2011-04-13 | 四川大学 | Single box thickness transflective blue-phase liquid crystal display |
| CN102081268A (en) * | 2011-03-09 | 2011-06-01 | 四川大学 | Single-box thick transflective blue phase liquid crystal display with low operating voltage and high optical efficiency |
| CN102135688A (en) * | 2009-12-11 | 2011-07-27 | 乐金显示有限公司 | Liquid crystal display device |
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| WO2012073798A1 (en) * | 2010-11-30 | 2012-06-07 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
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| CN102135688A (en) * | 2009-12-11 | 2011-07-27 | 乐金显示有限公司 | Liquid crystal display device |
| CN102012588A (en) * | 2010-12-16 | 2011-04-13 | 四川大学 | Single box thickness transflective blue-phase liquid crystal display |
| CN102081268A (en) * | 2011-03-09 | 2011-06-01 | 四川大学 | Single-box thick transflective blue phase liquid crystal display with low operating voltage and high optical efficiency |
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