CN101840097B - Blue phase liquid crystal display device and manufacturing method thereof - Google Patents
Blue phase liquid crystal display device and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a blue phase liquid crystal display device and a manufacturing method thereof, and the method comprises the following steps: configuring a first substrate opposite to and parallel with a second substrate, wherein the first substrate comprises a first electrode, and the second substrate comprises a second electrode; configuring a blue phase liquid crystal layer between the first substrate and the second substrate, wherein the blue phase liquid crystal layer comprises homocercal blue phase liquid crystals and polymer monomers; applying pressure on the first electrode and the second electrode to form a vertical electric field in the blue phase liquid crystal layer; and enabling a light source to irradiate in the blue phase liquid crystal layer to carry out polymerization on the polymer monomers to generate macromolecule stabilized homocercal blue phase liquid crystals. In addition, a blue phase liquid crystal display device is disclosed in the invention.
Description
Technical field
The present invention relates to a kind of display device, and relate in particular to a kind of blue phase liquid crystal display device.
Background technology
In recent years, in order to promote the display quality of liquid crystal display, the blue phase liquid crystal material of tool rapid answer characteristic comes into one's own gradually, wherein blue phase (Blue Phase) is a kind of between waiting to the liquid crystal phase between state (Isotropic) and cholesterol (Cholesteric) phase, the temperature range of its existence is very narrow, approximately only has 1 ℃ of temperature range.
Indigo plant has three kinds of out of phase existence mutually, be respectively the first blue phase (BP I), the second blue phase (BP II) and the 3rd blue phase (BPIII), wherein the first blue phase is cube structure (cubic) with the second indigo plant mutually, the 3rd blue then be unformed (amorphous) structure mutually, and the temperature that exists be three mutually in the highest one.
Fig. 1 a and Fig. 1 b are crystalline network synoptic diagram and disclination line (disclination line) synoptic diagram of the first blue phase liquid crystal.Fig. 1 c and Fig. 1 d are crystalline network synoptic diagram and the disclination line synoptic diagram of the second blue phase liquid crystal.Shown in Fig. 1 a and Fig. 1 c, the elementary cell of the first blue phase liquid crystal and the second blue phase liquid crystal structure is two cylindrical-shaped structures (double twist cylinder, DTC) 100 that reverse, and also namely wherein two cylindrical tube of reversing are orthogonal arrangement in the space.In addition, the first blue phase liquid crystal is body-centered cubic structure (body-centered cubic, BCC), and the second blue phase liquid crystal then is simple cubic structure (simple cubic, SC).In addition, the disclination line 102 of the first blue phase liquid crystal and the second blue phase liquid crystal is shown in Fig. 1 b and Fig. 1 d, be different from nematic (nematic) liquid crystal, stratose type (smectic) liquid crystal and wait to other liquid crystal phases such as type liquid crystal, the first blue phase liquid crystal and the second blue phase liquid crystal are understood the color graphics of the many platelet-like of demonstration (platelet texture) under polarizing microscope.
In addition, with the eurymeric blue phase liquid crystal, it must utilize the refraction index changing of the transverse electric field initiation of electrode generation itself, and then makes the variation that produces bright dark attitude behind the light penetration liquid crystal.Fig. 2 is the variation synoptic diagram of eurymeric blue phase liquid crystal when electrode drive.As shown in Figure 2, the eurymeric blue phase liquid crystal is not adding in the situation of transverse electric field, its perfect condition is to have optics isotropy (Isotropic), and its variations in refractive index (being Δ n) is 0, and present dark attitude (Normally Black), namely refer to when not applying a voltage to blue phase liquid crystal the situation that then blue phase liquid crystal just can't printing opacity in this alleged dark attitude.On the other hand, when adding transverse electric field in the eurymeric blue phase liquid crystal, then blue phase liquid crystal has the optical anisotropy, and therefore its refractive index can change (being Δ n＞0), so that the penetrable blue phase liquid crystal of light and present bright attitude.
Yet, with the display of present employing eurymeric blue phase liquid crystal as liquid crystal material, under actual conditions, be not perfection because blue phase liquid crystal two reverse cylindrical-shaped structure, therefore, though can cause blue phase liquid crystal to present dark attitude, the situation of the penetrable blue phase liquid crystal of light is still arranged; In other words, blue phase liquid crystal can present the similar state that is subject to bias voltage shown in Figure 2 when biasing not, thereby has the situation of dark attitude light leak.
In addition, because the problem of above-mentioned dark attitude light leak also can't solve by the transverse electric field that applies, hereat therefore the contrast of eurymeric blue phase liquid crystal display also can reduce.
Summary of the invention
A purpose of the present invention is to provide a kind of method for making of blue phase liquid crystal display device, and blue phase liquid crystal has the problem of dark attitude light leak in the blue phase liquid crystal display device so as to solving.
Another object of the present invention is that a kind of blue phase liquid crystal display device is being provided, so as to improving its image display quality.
One technology sample attitude of content of the present invention comprises about a kind of method for making of blue phase liquid crystal display device: dispose a first substrate relatively and be parallel to a second substrate, wherein first substrate comprises one first electrode, and second substrate comprises one second electrode; Dispose a blue phase liquid crystal layer and be sealed between first substrate and the second substrate, wherein blue phase liquid crystal layer comprises an eurymeric blue phase liquid crystal and a polymerization single polymerization monomer; Apply a voltage in the first electrode of first substrate and the second electrode of second substrate, so that form a vertical electric field in the blue phase liquid crystal layer perpendicular to the first electrode and the second electrode; And shine a light source in blue phase liquid crystal layer, make polymerization single polymerization monomer carry out polyreaction and produce a polymer-stabilized eurymeric blue phase liquid crystal.
Wherein, this of this first substrate the first electrode comprises one first vertical electrode, and this of this second substrate the second electrode comprises one second vertical electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode.
Wherein, this of this first substrate the first electrode comprises a subtend electrode, and this of this second substrate the second electrode comprises a pixel electrode, and this vertical electric field is formed between this counter electrode and this pixel electrode.
Wherein, this of this first substrate the first electrode comprises one first vertical electrode and a subtend electrode, this of this second substrate the second electrode comprises one second vertical electrode and a pixel electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode and between this counter electrode and this pixel electrode.
Wherein, this first substrate comprises a colored filter substrate, and this second substrate comprises a thin-film transistor array base-plate.
Wherein, put on this voltage of this first electrode and this second electrode between about 2 volts to about 100 volts.
Wherein, this vertical electric field is to form when this eurymeric blue phase liquid crystal is in the blue phase temperature range in this blue phase liquid crystal layer.
Wherein, this indigo plant phase temperature range is-10 ℃ to about 60 ℃ approximately.
Wherein, this light source comprises a ultraviolet light, a visible light, an infrared light or its combination.
Another technology sample attitude of content of the present invention is about a kind of blue phase liquid crystal display device, and it comprises a first substrate, a second substrate and a blue phase liquid crystal layer.First substrate comprises one first electrode.Second substrate is with respect to the first substrate configured in parallel, and comprises one second electrode.Blue phase liquid crystal layer comprises a polymer-stabilized eurymeric blue phase liquid crystal, be sealed between first substrate and the second substrate, wherein polymer-stabilized eurymeric blue phase liquid crystal is by an eurymeric blue phase liquid crystal and a polymerization single polymerization monomer, by the first electrode and the second electrode are applied a voltage, so that form a vertical electric field in the blue phase liquid crystal layer perpendicular to the first electrode and the second electrode, and shine a light source in blue phase liquid crystal layer, make polymerization single polymerization monomer carry out polyreaction and produce polymer-stabilized eurymeric blue phase liquid crystal.
Wherein, this first substrate comprises one first vertical electrode towards this second substrate, and this second substrate comprises one second vertical electrode towards this first substrate, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode
Wherein, this first electrode comprises a subtend electrode, and this second electrode comprises a pixel electrode, and this vertical electric field is formed between this counter electrode and this pixel electrode.
Wherein, this first electrode comprises one first vertical electrode and a subtend electrode, this second electrode comprises one second vertical electrode and a pixel electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode and between this counter electrode and this pixel electrode.
Wherein, this first substrate comprises a colored filter substrate, and this second substrate comprises a thin-film transistor array base-plate.
Wherein, this voltage that this first electrode and this second electrode is applied is between about 2 volts to about 100 volts.
Form when wherein, this vertical electric field this eurymeric blue phase liquid crystal in this blue phase liquid crystal layer is in the blue phase temperature range.
Wherein, this indigo plant phase temperature range is-10 ℃ to about 60 ℃ approximately.
Wherein, this light source comprises a ultraviolet light, a visible light, an infrared light or its combination.
According to technology contents of the present invention, application of aforementioned blue phase liquid crystal display device and preparation method thereof can make blue phase liquid crystal more level off to the tropisms such as optics under actual conditions, reducing the situation of dark attitude light leak, and promotes the contrast of showing image simultaneously.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 a and Fig. 1 b are crystalline network synoptic diagram and the disclination line synoptic diagram of the first blue phase liquid crystal;
Fig. 1 c and Fig. 1 d are crystalline network synoptic diagram and the disclination line synoptic diagram of the second blue phase liquid crystal;
Fig. 2 is the variation synoptic diagram of eurymeric blue phase liquid crystal when electrode drive;
Fig. 3 is the process flow diagram that illustrates a kind of method for making of blue phase liquid crystal display device according to the embodiment of the invention;
Fig. 4 a is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to first embodiment of the invention;
Fig. 4 b is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to second embodiment of the invention;
Fig. 4 c is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to third embodiment of the invention;
Fig. 4 d is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to fourth embodiment of the invention;
Fig. 5 be in the situation that the different vertical electric field is made according to the made blue phase liquid crystal display device of the method for Fig. 3, the variation synoptic diagram of polymer-stabilized eurymeric blue phase liquid crystal its operating voltage that applies and light transmittance in the situation of different vertical electric field wherein;
Fig. 6 is according to the made blue phase liquid crystal display device of the method for Fig. 3, wherein polymer-stabilized eurymeric blue phase liquid crystal in the situation of different vertical electric field its comparison synoptic diagram of corresponding relative contrast.
Wherein, Reference numeral:
100: two cylindrical-shaped structures that reverse
102: the disclination line
310: first substrate
312: the first electrodes
320: second substrate
322: the second electrodes
330,410: blue phase liquid crystal layer
332: the eurymeric blue phase liquid crystal
334: polymerization single polymerization monomer
340: polymer-stabilized eurymeric blue phase liquid crystal
400,500,600,700: blue phase liquid crystal display device
402: the first transparency carriers
404,604,704: the first vertical electrodes
405: dielectric layer
406,506,606,706: the first pixel electrodes
408,508,608,708: the first counter electrodes
412: the second transparency carriers
414,614,714: the second vertical electrodes
422,522,622,722: thin-film transistor array base-plate
424: colored filter substrate
430: chromatic filter layer
516,616,716: the second pixel electrodes
518,618,718: the second counter electrodes
524,624,724: the colored filter film transistor (TFT) array substrate
Embodiment
Hereinafter cooperate appended accompanying drawing to elaborate for embodiment, but the embodiment that provides limits the scope that the present invention is contained, and the description of structure running is non-in order to limit the order of its execution, any structure that is reconfigured by element, the device with impartial effect that produces all is the scope that the present invention is contained.Wherein accompanying drawing is not mapped according to life size only for the purpose of description.
Fig. 3 is the process flow diagram that illustrates a kind of method for making of blue phase liquid crystal display device according to the embodiment of the invention.Wherein, a represents to apply voltage (vertical electric field); B represents radiation source, and c represents photopolymerization reaction.What this needed first explanation be, reach for convenience of description and highlight for the purpose of the technology of the present invention, embodiment shown in Figure 3 only illustrates the part of blue phase (Blue Phase) liquid crystal indicator and makes flow process, the method for making of blue phase liquid crystal display device reality is not limited to this, those skilled in the art can this making flow process cooperate other existing corresponding technique, so as to finishing the making of blue phase liquid crystal display device.
As shown in Figure 3, at first, dispose a first substrate 310 relatively and be parallel to a second substrate 320, wherein first substrate 310 comprises one first electrode 312, and second substrate 320 comprises one second electrode 322.In addition, in the present embodiment, first substrate 310 for example is a colored filter substrate, and second substrate 320 for example is a thin-film transistor array base-plate.
Then, disposing a blue phase liquid crystal layer 330 is sealed between first substrate 310 and the second substrate 320, and blue phase liquid crystal layer 330 comprises eurymeric blue phase liquid crystal 332 and polymerization single polymerization monomer (monomer) 334, be well known to those skilled in the art as for the material of eurymeric blue phase liquid crystal 332 with polymerization single polymerization monomer (monomer) 334, therefore repeat no more.Eurymeric blue phase liquid crystal 332 can by with the liquid crystal operation of normality in a specific range of temperatures and form, polymerization single polymerization monomer 334 then is to supply the follow-up polyreaction of carrying out, and makes the polymer-stabilized eurymeric blue phase liquid crystal (polymer stabilized blue phase liquid crystal) 340 that produces after the reaction can operate in broad temperature range.
The present invention applies voltage V (curing voltage) in the first electrode 312 of first substrate 310 and the second electrode 322 of second substrate 320, so that form a vertical electric field in the blue phase liquid crystal layer 330, and this vertical electric field is perpendicular to the first electrode 312 and the second electrode 322.In the present embodiment, putting on the voltage V of the first electrode 312 and the second electrode 322 can be between about 1 volt to about 100 volts.And the formed vertical electric field of voltage V forms when being preferably in eurymeric blue phase liquid crystal 332 is in a blue phase temperature range, and wherein this blue phase temperature range can be-10 ℃ to about 60 ℃ approximately.
Then, shine a light source in blue phase liquid crystal layer 330, make polymerization single polymerization monomer 334 carry out photopolymerization reaction, to produce polymer-stabilized eurymeric blue phase liquid crystal (polymer stabilized blue phase liquid crystal) 340.In the present embodiment, shine in the light source of blue phase liquid crystal layer 330 and can comprise ultraviolet light, visible light, infrared light or its combination, its mid-infrared light can be produced by a thermal source, so as to blue phase liquid crystal layer 330 being carried out the step of precuring (pre-curing), then can carry out again the step of ultraviolet light polymerization (UV curing) to blue phase liquid crystal layer 330 by ultraviolet light.
At this moment, owing to become vertical electric field according to the voltage V-arrangement in the blue phase liquid crystal layer 330, so eurymeric blue phase liquid crystal 332 can be affected by vertical electric field and presents its perfect condition; In other words, the polymer-stabilized eurymeric blue phase liquid crystal 340 after the polymerization can have optics isotropy (Isotropic) because of the formation of vertical electric field, and presents better dark attitude, and the situation of less light leak is arranged.
It should be noted that at this, apply among the invention described above embodiment voltage V with the step that forms vertical electric field and radiation source in the step of blue phase liquid crystal layer 330, both can successively carry out or carry out simultaneously, right those skilled in the art can adjust according to the actual process situation, not as limit.
Followingly will structure and type of drive thereof by the made blue phase liquid crystal display device of said method be described with specific embodiment, right the following example only for convenience of description for the purpose of, the practical structures of blue phase liquid crystal display device and type of drive be not as limit.
Fig. 4 a is for illustrating a kind of synoptic diagram of blue phase liquid crystal display device according to first embodiment of the invention.Blue phase liquid crystal display device 400 comprise first substrate (for example: colored filter substrate 424), first substrate (for example: thin-film transistor array base-plate 422) and blue phase liquid crystal layer 410, wherein blue phase liquid crystal layer 410 is disposed between colored filter substrate 424 and the thin-film transistor array base-plate 422, and comprises by the made polymer-stabilized eurymeric blue phase liquid crystal of said method.
Particularly, thin-film transistor array base-plate 422 can more comprise the first transparency carrier 402, the first vertical electrode 404, dielectric layer 405, the first pixel electrode 406 and the first counter electrode 408, and colored filter substrate 424 can more comprise the second transparency carrier 412, chromatic filter layer 430 and the second vertical electrode 414.In addition; the first transparency carrier 402 can more comprise the thin film transistor (TFT)s (TFT) such as sweep trace, gate insulator, channel layer, data line, drain electrode and protective seam and interlock circuit structure; and can comprise in addition black matrix" (not illustrating) on the second transparency carrier 412; to define the area that corresponds to pixel region; and cover and be positioned at viewing area part in addition, avoid side light leakage.Detailed thin-film transistor array base-plate 422 is well known to those skilled in the art, and therefore repeats no more.
Shown in Fig. 4 a, the first transparency carrier 402 and the 412 relative configurations of the second transparency carrier, the first pixel electrode 406 and the first counter electrode 408 are landscape configuration, the first vertical electrode 404 and the 414 relative configurations of the second vertical electrode, so that the first vertical electrode 404 is towards colored filter substrate 424, and the second vertical electrode 414 is towards thin-film transistor array base-plate 422, and blue phase liquid crystal layer 410 is disposed between the first vertical electrode 404 and the second vertical electrode 414.In addition, the first pixel electrode 406 and the first counter electrode 408 can comprise respectively finger electrode, and adjacent one another are staggered.
When making, can in photopolymerization process shown in Figure 3, apply and solidify voltage V in the first vertical electrode 404 and the second vertical electrode 414, so that the first vertical electrode 404 and the second vertical electrode 414 have respectively different potentials (as: current potential of negative value and on the occasion of current potential), and the vertical electric field perpendicular to the first transparency carrier 402 and the second transparency carrier 412 is formed between the first vertical electrode 404 and the second vertical electrode 414, the tropisms such as optics so as to the polymer-stabilized eurymeric blue phase liquid crystal in the auxiliary compensation blue phase liquid crystal layer 410, cause polymer-stabilized eurymeric blue phase liquid crystal can have because of the formation of vertical electric field the better tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character.
On the other hand, after blue phase liquid crystal display device 400 completes, also can apply operating voltage to blue phase liquid crystal display device 400, so that therefore have transverse electric field in the blue phase liquid crystal display device 400, for example be that (in-plane switch is switched on common plane, IPS) transverse electric field of pattern, so as to the control light transmittance, and the shown image brilliance of control blue phase liquid crystal display device 400.Particularly, can apply operating voltage in the first pixel electrode 406 and the first counter electrode 408, so that the first pixel electrode 406 and the first counter electrode 408 have respectively different potentials (as: current potential of negative value and on the occasion of current potential), and between the first pixel electrode 406 and the first counter electrode 408, form transverse electric field, so that transverse electric field is parallel to the first transparency carrier 402 and the second transparency carrier 412, make it present bright attitude so as to driving the polymer-stabilized eurymeric blue phase liquid crystal of control.
Fig. 4 b is for illustrating a kind of synoptic diagram of blue phase liquid crystal display device according to second embodiment of the invention.Blue phase liquid crystal display device 500 comprise first substrate (for example: colored filter film transistor (TFT) array substrate 524), second substrate (for example: thin-film transistor array base-plate 522) and blue phase liquid crystal layer 410.Compared to Fig. 4 a, the blue phase liquid crystal display device 500 of present embodiment does not comprise aforesaid the first vertical electrode 404 and the second vertical electrode 414, but colored filter film transistor (TFT) array substrate 524 comprises the second pixel electrode 516 and the second counter electrode 518 in addition, wherein the second pixel electrode 516 and the second counter electrode 518 are landscape configuration, and all be positioned at the second transparency carrier 412 the inboard and in the face of the first transparency carrier 402.
Shown in Fig. 4 b, the second pixel electrode 516 is with respect to 508 configurations of the first counter electrode, and the second counter electrode 518 is with respect to 506 configurations of the first pixel electrode, so that the first pixel electrode 506 and the first counter electrode 508 be all towards colored filter film transistor (TFT) array substrate 524, and the second pixel electrode 516 and the second counter electrode 518 are all towards thin-film transistor array base-plate 522.In addition, the second pixel electrode 516 and the second counter electrode 518 can comprise respectively finger electrode, and adjacent one another are staggered.
When making, can in photopolymerization process shown in Figure 3, apply a voltage to the electrode in colored filter film transistor (TFT) array substrate 524 and the thin-film transistor array base-plate 522, so that the first pixel electrode 506 and the second counter electrode 518 have respectively different potentials (as: current potential of negative value and on the occasion of current potential), and the first counter electrode 508 and the second pixel electrode 516 have respectively different potentials (as: on the occasion of current potential and the current potential of negative value), thereby be formed between the first pixel electrode 506 and the second counter electrode 518 perpendicular to the vertical electric field of the first transparency carrier 402 and the second transparency carrier 412, and be formed between the first counter electrode 508 and the second pixel electrode 516, the tropisms such as optics so as to the polymer-stabilized eurymeric blue phase liquid crystal in the auxiliary compensation blue phase liquid crystal layer 410, cause polymer-stabilized eurymeric blue phase liquid crystal can have because of the formation of vertical electric field the better tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character.
On the other hand, also can apply operating voltage to blue phase liquid crystal display device 500, so that therefore have transverse electric field in the blue phase liquid crystal display device 500, for example be that double layer planar switches (in-plane switching, IPS) transverse electric field of pattern, so as to the control light transmittance, and the shown image brilliance of control blue phase liquid crystal display device 500.Particularly, can apply a voltage to the first pixel electrode 506 and the first counter electrode 508, or apply a voltage to the second pixel electrode 516 and the second counter electrode 518, make it have respectively different potentials, and transverse electric field is formed between the first pixel electrode 506 and the first counter electrode 508, or be formed between the second pixel electrode 516 and the second counter electrode 518, make it present bright attitude so as to driving the polymer-stabilized eurymeric blue phase liquid crystal of control.
Fig. 4 c is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to third embodiment of the invention.Blue phase liquid crystal display device 600 comprises first substrate, and (for example: colored filter film transistor (TFT) array substrate 624, second substrate are (for example: thin-film transistor array base-plate 622) and blue phase liquid crystal layer 410.Compared to Fig. 4 a, the blue phase liquid crystal display device 600 of present embodiment more comprises the second pixel electrode 616 and the second counter electrode 618, wherein the second pixel electrode 616 and the second counter electrode 618 are landscape configuration, be positioned at the inboard of the second transparency carrier 412 and face the first transparency carrier 402, and between the second vertical electrode 614 and the first vertical electrode 604.
Shown in Fig. 4 c, the first vertical electrode 604 is with respect to 614 configurations of the second vertical electrode, the second pixel electrode 616 is with respect to 608 configurations of the first counter electrode, and the second counter electrode 618 is with respect to 606 configurations of the first pixel electrode, so that the first vertical electrode 604, the first pixel electrode 606 and the first counter electrode 608 all towards colored filter film transistor (TFT) array substrate 624, the second vertical electrodes 614, the second pixel electrode 616 and the second counter electrode 618 all towards thin-film transistor array base-plate 622.In addition, the second pixel electrode 616 and the second counter electrode 618 also can comprise respectively finger electrode, and adjacent one another are staggered.
When making, can in photopolymerization process shown in Figure 3, apply a voltage to the electrode in colored filter film transistor (TFT) array substrate 624 and the thin-film transistor array base-plate 622, so that between the first vertical electrode 604 and the second vertical electrode 614, between the first pixel electrode 606 and the second counter electrode 618 and between the first counter electrode 608 and the second pixel electrode 616, can form the vertical electric field perpendicular to the first transparency carrier 402 and the second transparency carrier 412, the tropisms such as optics so as to the polymer-stabilized eurymeric blue phase liquid crystal in the auxiliary compensation blue phase liquid crystal layer 410, cause polymer-stabilized eurymeric blue phase liquid crystal can have because of the formation of vertical electric field the better tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character.
On the other hand, also can apply operating voltage to blue phase liquid crystal display device 600, so that therefore have transverse electric field in the blue phase liquid crystal display device 600, for example be that fringing field switches (fringe field switch, FFS) transverse electric field of pattern, so as to the control light transmittance, and the shown image brilliance of control blue phase liquid crystal display device 600.Particularly, can apply operating voltage to form transverse electric field between the first pixel electrode 606 and the first counter electrode 608, or be formed between the second pixel electrode 616 and the second counter electrode 618, make it present bright attitude so as to driving the polymer-stabilized eurymeric blue phase liquid crystal of control.
Fig. 4 d is the synoptic diagram that illustrates a kind of blue phase liquid crystal display device according to fourth embodiment of the invention.With the embodiment of the invention, the second substrate of blue phase liquid crystal display device 700 (for example: thin-film transistor array base-plate 722) and first substrate (for example: colored filter film transistor (TFT) array substrate 724), put on the voltage of the first vertical electrode 704, the second vertical electrode 714, the first pixel electrode 706, the first counter electrode 708, the second pixel electrode 716 and the second counter electrode 718, all different from the voltage that applies among Fig. 4 c.Specifically, the current potential of the first counter electrode 708 and the second counter electrode 718 can be set as 0 volt, the current potential of the first vertical electrode 704 and the first pixel electrode 706 can be set as on the occasion of, and the current potential of the first vertical electrode 704 is less than the current potential of the first pixel electrode 706, and for example the current potential of the current potential of the first vertical electrode 704 and the first pixel electrode 706 is respectively 5 volts and 10 volts.In addition, the current potential of the second vertical electrode 714 and the second pixel electrode 716 can be set as negative value, and the current potential of the second vertical electrode 714 is greater than the current potential of the second pixel electrode 716, and for example the current potential of the current potential of the second vertical electrode 714 and the second pixel electrode 716 is respectively-5 volts and-10 volts.
Thus, between the first vertical electrode 704 and the second vertical electrode 714, between the second pixel electrode 716 and the first counter electrode 708, and second between counter electrode 718 and the first pixel electrode 706, just can form respectively vertical electric field equally, and between the first vertical electrode 704 and the first counter electrode 708, between the second vertical electrode 714 and the second counter electrode 718, between the first pixel electrode 706 and the first counter electrode 708, and can form respectively transverse electric field equally between the second pixel electrode 716 and the second counter electrode 718.
The material of the electrode in above-described embodiment can comprise according to actual demand the transparent conductive materials such as tin indium oxide (ITO), indium zinc oxide (IZO), or the conducting polymer such as poly-dioxoethyl plug fen (PEDOT), but not as limit, also be that in fact the electrode of the embodiment of the invention can comprise any material with satisfactory electrical conductivity.
Hence one can see that, embodiment shown in Fig. 4 a～Fig. 4 d is the design that utilizes edged electrode, make in the blue phase liquid crystal layer 410 and can produce transverse electric field and vertical electric field, so as to effectively controlling the penetrance of polymer-stabilized eurymeric blue phase liquid crystal in the blue phase liquid crystal layer 410, and reduce the phenomenon of dark attitude light leak.
Fig. 5 be in the situation that the different vertical electric field is made according to the made blue phase liquid crystal display device of the method for Fig. 3, the variation synoptic diagram of polymer-stabilized eurymeric blue phase liquid crystal its operating voltage that applies and light transmittance in the situation of different vertical electric field wherein.As shown in the figure, in the photopolymerization process unguyedization voltage, apply 5 volts and solidify voltages and apply 25 volts and solidify under three kinds of situations such as voltages, take operating voltage 0V as example, polymer-stabilized eurymeric blue phase liquid crystal is in the situation of unguyedization voltage, and the situation that produces dark attitude light leak is (as: the two is higher than other for light transmittance T) comparatively obviously; Relatively, polymer-stabilized eurymeric blue phase liquid crystal is in the situation that applies 5 volts of curing voltages and 25 volts of curing voltages, and its situation that produces dark attitude light leak is just improved (as: light transmittance T lowers with solidifying the voltage increase) gradually.In addition, as shown in the figure, even if polymer-stabilized eurymeric blue phase liquid crystal is applied operating voltage and operates, in the situation that applies 25 volts of curing voltages, light transmittance is still more unguyedization voltage and applies 5 volts of two kinds of situations such as curing voltage and also will come lowly, also namely can avoid producing the situation of dark attitude light leak.
Therefore, the dark attitude light leak situation of polymer-stabilized eurymeric blue phase liquid crystal at add operation voltage not with apply under the state of operating voltage, all can reduce along with the strength increase that solidifies the vertical electric field that voltage produces.In other words, at add operation voltage not with apply under the state of operating voltage, the nonideality light transmittance of blue phase liquid crystal all can reduce along with the strength increase of vertical electric field.For instance, the light transmittance of blue phase liquid crystal is to be down to 0.05% along with the increase of vertical electric field by 0.6%, and experimental data afterwards can be as shown in Figure 5 through normalization (Normalized).Because the contrast of display element is that display element is at the brightness ratio of the most light attitude with dark attitude, therefore by the data after the normalization shown in Figure 5 as can be known, contrast (the contrast ratio of the blue phase liquid crystal display device that unguyedization voltage in the photopolymerization process (as: applying 0 volt of voltage) is made, CR) be 6.81, in same process, apply 25 volts of curing voltages and then can be promoted to 25.46 to form made its contrast of blue phase liquid crystal display device of vertical electric field.
Fig. 6 is according to the made blue phase liquid crystal display device of the method for Fig. 3, wherein polymer-stabilized eurymeric blue phase liquid crystal in the situation of different vertical electric field its comparison synoptic diagram of corresponding relative contrast.As shown in the figure, if with in the photopolymerization process not the relative contrast of the made blue phase liquid crystal display device of biasing (applying 0 volt of voltage) be decided to be 1, then in same process, apply 25 volts of voltages and can promote about 3.7 times with the relative contrast that forms the made blue phase liquid crystal display device of vertical electric field.
On the other hand, for the operating temperature range that makes liquid crystal enlarges, and add response type monomer (reactivemonomer) in liquid crystal layer, so that form the mode such as polymer-stabilized eurymeric blue phase liquid crystal in the photopolymerization process, often make the eurymeric blue phase liquid crystal when making alive not, can't present the tropisms such as perfect optics, and then cause blue phase liquid crystal to have dark attitude light leak, and reduce simultaneously the contrast of show image.
Yet, by the embodiment of the invention described above as can be known, the electrode of blue phase liquid crystal layer both sides is to be applied in voltage in the photopolymerization process, so that blue phase liquid crystal is subject to the effect of vertical electric field simultaneously in the photopolymerization process, can be so as to compensation so that polymer-stabilized eurymeric blue phase liquid crystal levels off to the tropisms such as optics more under actual conditions, reducing the situation of dark attitude light leak, and promote simultaneously the contrast of showing image.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (18)
1. the method for making of a blue phase liquid crystal display device is characterized in that, comprises:
Dispose a first substrate relatively and be parallel to a second substrate, this first substrate comprises one first electrode, and this second substrate comprises one second electrode;
Dispose a blue phase liquid crystal layer, be sealed between this first substrate and this second substrate, wherein this blue phase liquid crystal layer comprises an eurymeric blue phase liquid crystal and a polymerization single polymerization monomer;
Apply one and solidify voltage in this first electrode of this first substrate and this second electrode of this second substrate, so that form a vertical electric field in this blue phase liquid crystal layer perpendicular to this first electrode and this second electrode; And
Shine a light source in this blue phase liquid crystal layer, under this vertical electric field, make this polymerization single polymerization monomer carry out polyreaction and produce a polymer-stabilized eurymeric blue phase liquid crystal.
2. method for making according to claim 1, it is characterized in that, this of this first substrate the first electrode comprises one first vertical electrode, and this of this second substrate the second electrode comprises one second vertical electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode.
3. method for making according to claim 1 is characterized in that, this of this first substrate the first electrode comprises a subtend electrode, and this of this second substrate the second electrode comprises a pixel electrode, and this vertical electric field is formed between this counter electrode and this pixel electrode.
4. method for making according to claim 1, it is characterized in that, this of this first substrate the first electrode comprises one first vertical electrode and a subtend electrode, this of this second substrate the second electrode comprises one second vertical electrode and a pixel electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode and between this counter electrode and this pixel electrode.
5. method for making according to claim 1 is characterized in that, this first substrate comprises a colored filter substrate, and this second substrate comprises a thin-film transistor array base-plate.
6. method for making according to claim 1 is characterized in that, puts on this curing voltage of this first electrode and this second electrode between 2 volts to 100 volts.
7. method for making according to claim 1 is characterized in that, this vertical electric field is to form when this eurymeric blue phase liquid crystal is in the blue phase temperature range in this blue phase liquid crystal layer.
8. method for making according to claim 7 is characterized in that, this indigo plant phase temperature range is-10 ℃ to 60 ℃.
9. method for making according to claim 1 is characterized in that, this light source comprises a ultraviolet light, a visible light, an infrared light or its combination.
10. a blue phase liquid crystal display device is characterized in that, comprises:
One first substrate comprises one first electrode;
One second substrate, with respect to this first substrate configured in parallel, this second substrate comprises one second electrode; And
One blue phase liquid crystal layer, comprise a polymer-stabilized eurymeric blue phase liquid crystal, be sealed between this first substrate and this second substrate, this polymer-stabilized eurymeric blue phase liquid crystal is by an eurymeric blue phase liquid crystal and a polymerization single polymerization monomer, by this first electrode and this second electrode are applied a curing voltage, so that form a vertical electric field in this blue phase liquid crystal layer perpendicular to this first electrode and this second electrode, and make this polymerization single polymerization monomer carry out polyreaction and produce this polymer-stabilized eurymeric blue phase liquid crystal in this blue phase liquid crystal layer at irradiation one light source under this vertical electric field.
11. blue phase liquid crystal display device according to claim 10, it is characterized in that, this first substrate comprises one first vertical electrode towards this second substrate, this second substrate comprises one second vertical electrode towards this first substrate, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode.
12. blue phase liquid crystal display device according to claim 10 is characterized in that, this first electrode comprises a subtend electrode, and this second electrode comprises a pixel electrode, and this vertical electric field is formed between this counter electrode and this pixel electrode.
13. blue phase liquid crystal display device according to claim 10, it is characterized in that, this first electrode comprises one first vertical electrode and a subtend electrode, this second electrode comprises one second vertical electrode and a pixel electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode and between this counter electrode and this pixel electrode.
14. blue phase liquid crystal display device according to claim 10 is characterized in that, this first substrate comprises a colored filter substrate, and this second substrate comprises a thin-film transistor array base-plate.
15. blue phase liquid crystal display device according to claim 10 is characterized in that, this curing voltage that this first electrode and this second electrode are applied is between 2 volts to 100 volts.
16. blue phase liquid crystal display device according to claim 10 is characterized in that, forms when this vertical electric field this eurymeric blue phase liquid crystal in this blue phase liquid crystal layer is in the blue phase temperature range.
17. blue phase liquid crystal display device according to claim 16 is characterized in that, this indigo plant phase temperature range is-10 ℃ to 60 ℃.
18. blue phase liquid crystal display device according to claim 10 is characterized in that, this light source comprises a ultraviolet light, a visible light, an infrared light or its combination.
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| TWI418905B (en) * | 2010-12-29 | 2013-12-11 | Au Optronics Corp | Blue phase liquid crystal display panel and driving method thereof |
| CN102707511A (en) * | 2011-05-20 | 2012-10-03 | 京东方科技集团股份有限公司 | Blue phase liquid crystal display device and manufacturing method thereof |
| CN102937757B (en) * | 2011-08-15 | 2015-07-08 | 群康科技(深圳)有限公司 | Blue-phase liquid crystal display device and drive method thereof |
| CN102681195A (en) * | 2011-11-11 | 2012-09-19 | 京东方科技集团股份有限公司 | Polarized light transformational structure and display device |
| CN105589242B (en) * | 2012-04-12 | 2019-07-05 | 群康科技(深圳)有限公司 | Dot structure substrate and the liquid crystal display panel for applying it |
| TWI472854B (en) * | 2012-06-27 | 2015-02-11 | Au Optronics Corp | Blue phase liquid crystal display panel and fabricating method thereof |
| CN103543552B (en) * | 2012-07-10 | 2016-07-06 | 群康科技(深圳)有限公司 | Display panels, its driving method and comprise its liquid crystal display |
| CN103576387B (en) * | 2012-07-24 | 2016-08-10 | 群康科技(深圳)有限公司 | Liquid crystal panel and UV curing method thereof |
| TWI518414B (en) * | 2014-12-05 | 2016-01-21 | 友達光電股份有限公司 | Display panel and manufacturing method thereof |
| EP3115436A1 (en) * | 2015-07-08 | 2017-01-11 | Essilor International (Compagnie Generale D'optique) | Method for obtaining a material comprising a liquid crystal mix with a stabilized blue phase and optical article comprising this material |
| JP6488950B2 (en) * | 2015-08-28 | 2019-03-27 | 東芝ライテック株式会社 | LCD panel manufacturing equipment |
| JP2017106986A (en) * | 2015-12-07 | 2017-06-15 | 東芝ライテック株式会社 | Manufacturing apparatus of liquid crystal panel and manufacturing method of liquid crystal panel |
| CN105425496A (en) * | 2016-01-06 | 2016-03-23 | 上海交通大学 | Blue phase liquid crystal phase modulator and polarization non-independent method thereof |
| CN106094381A (en) | 2016-08-25 | 2016-11-09 | 深圳市华星光电技术有限公司 | A kind of Thin Film Transistor-LCD |
| CN108845441A (en) * | 2018-06-22 | 2018-11-20 | 惠科股份有限公司 | Display panel and its manufacturing method |
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