CN101840097A - 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 LCD, the blue phase liquid crystal material of tool rapid answer characteristic comes into one's own gradually, its medium blue phase (Blue Phase) is a kind of between the liquid crystal phase that waits between state (Isotropic) and cholesterol (Cholesteric) phase, the temperature range of its existence is very narrow, approximately has only 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 a cube structure (cubic) with second indigo plant mutually, the 3rd blue then be unformed (amorphous) structure mutually, and the temperature that exists be three the highest by one in mutually.
Fig. 1 a and Fig. 1 b are the crystalline network synoptic diagram and disclination line (disclination line) synoptic diagram of first blue phase liquid crystal.Fig. 1 c and Fig. 1 d are the crystalline network synoptic diagram and the disclination line synoptic diagram of second blue phase liquid crystal.Shown in Fig. 1 a and Fig. 1 c, the elementary cell of first blue phase liquid crystal and the second blue phase liquid crystal structure for two reverse cylindrical-shaped structure (double twist cylinder, DTC) 100, also promptly wherein two cylindrical tube of reversing are orthogonal arrangement in the space.In addition, first blue phase liquid crystal be body-centered cubic structure (body-centered cubic, BCC), second blue phase liquid crystal then be the simple cubic structure (simple cubic, SC).In addition, the disclination line 102 of first blue phase liquid crystal and 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, first blue phase liquid crystal and 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 under 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), promptly be meant when not applying a voltage to blue phase liquid crystal in this alleged dark attitude, then the situation that blue phase liquid crystal just can't printing opacity.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), makes the penetrable blue phase liquid crystal of light and presents bright attitude.
Yet, with the display of present employing eurymeric blue phase liquid crystal as liquid crystal material and since blue phase liquid crystal two reverse cylindrical-shaped structure under actual conditions no all roses, 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 subjected 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 is applied, 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 one first substrate relatively and be parallel to one 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 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 first electrode of first substrate and second electrode of second substrate, make to form a vertical electric field in the blue phase liquid crystal layer perpendicular to first electrode and 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 first electrode of this first substrate comprises one first vertical electrode, and this second electrode of this second substrate comprises one second vertical electrode, and this vertical electric field is formed between this first vertical electrode and this second vertical electrode.
Wherein, this first electrode of this first substrate comprises a pair of to electrode, and this second electrode of this second substrate comprises a pixel electrode, and this vertical electric field is formed between this counter electrode and this pixel electrode.
Wherein, this first electrode of this first substrate comprises one first vertical electrode and a subtend electrode, this second electrode of this second substrate 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 one first substrate, one 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 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 first electrode and second electrode are applied a voltage, make and form a vertical electric field in the blue phase liquid crystal layer perpendicular to first electrode and 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 pair of to 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 are 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 level off to tropisms such as optics more 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 the crystalline network synoptic diagram and the disclination line synoptic diagram of first blue phase liquid crystal;
Fig. 1 c and Fig. 1 d are the crystalline network synoptic diagram and the disclination line synoptic diagram of 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 under 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 wherein polymer-stabilized eurymeric blue phase liquid crystal operating voltage that it applied under the situation of different vertical electric field and light transmittance;
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 under 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: the first substrates
312: the first electrodes
320: the second substrates
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 is provided not is the scope that contains in order to restriction the present invention, and the description of structure running is non-in order to limit the order of its execution, any structure that reconfigures 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 explanation earlier 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 thereto, those skilled in the art can this making flow process cooperate other existing corresponding technology, so as to finishing the making of blue phase liquid crystal display device.
As shown in Figure 3, at first, dispose one first substrate 310 relatively and be parallel to one second substrate 320, wherein first substrate 310 comprises one first electrode, 312, the second substrates 320 and 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 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, therefore repeat no more with polymerization single polymerization monomer (monomer) 334.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 the polymer-stabilized eurymeric blue phase liquid crystal (polymer stabilized blue phase liquid crystal) 340 that the reaction back is produced can operate in broad temperature range.
The present invention applies voltage V (curing voltage) in first electrode 312 of first substrate 310 and second electrode 322 of second substrate 320, make to form a vertical electric field in the blue phase liquid crystal layer 330, and this vertical electric field is perpendicular to first electrode 312 and second electrode 322.In the present embodiment, putting on the voltage V of first electrode 312 and 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 the step of ultraviolet light polymerization (UV curing) again 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 influenced 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 preferable 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 first transparency carrier 402, first vertical electrode 404, dielectric layer 405, first pixel electrode 406 and first counter electrode 408, and colored filter substrate 424 can more comprise second transparency carrier 412, chromatic filter layer 430 and second vertical electrode 414.In addition; first transparency carrier 402 can more comprise 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 black matrix" (not illustrating) on second transparency carrier 412 in addition; 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, first transparency carrier 402 and the 412 relative configurations of second transparency carrier, first pixel electrode 406 and first counter electrode 408 are landscape configuration, first vertical electrode 404 and the 414 relative configurations of second vertical electrode, make the vertical electrode 404 of winning towards colored filter substrate 424, and second vertical electrode 414 is towards thin-film transistor array base-plate 422, and blue phase liquid crystal layer 410 is disposed between first vertical electrode 404 and second vertical electrode 414.In addition, first pixel electrode 406 and first counter electrode 408 can comprise finger electrode respectively, and adjacent one another are staggered.
When making, can in photopolymerization process shown in Figure 3, apply and solidify voltage V in first vertical electrode 404 and second vertical electrode 414, make win vertical electrode 404 and second vertical electrode 414 have different potentials (as: current potential of negative value and on the occasion of current potential) respectively, and the vertical electric field perpendicular to first transparency carrier 402 and second transparency carrier 412 is formed between first vertical electrode 404 and second vertical electrode 414, 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 preferable tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character because of the formation of vertical electric field.
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, make and therefore have transverse electric field in the blue phase liquid crystal display device 400, for example be that common plane is switched (in-plane switch, 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 first pixel electrode 406 and first counter electrode 408, make win pixel electrode 406 and first counter electrode 408 have different potentials (as: current potential of negative value and on the occasion of current potential) respectively, and between first pixel electrode 406 and first counter electrode 408, form transverse electric field, make transverse electric field be parallel to first transparency carrier 402 and second transparency carrier 412, make it present bright attitude so as to the polymer-stabilized eurymeric blue phase liquid crystal of drive controlling.
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 first vertical electrode 404 and second vertical electrode 414, but colored filter film transistor (TFT) array substrate 524 comprises second pixel electrode 516 and second counter electrode 518 in addition, wherein second pixel electrode 516 and second counter electrode 518 are landscape configuration, and all be positioned at second transparency carrier 412 the inboard and in the face of first transparency carrier 402.
Shown in Fig. 4 b, second pixel electrode 516 is with respect to 508 configurations of first counter electrode, and second counter electrode 518 is with respect to 506 configurations of first pixel electrode, make win pixel electrode 506 and first counter electrode 508 all towards colored filter film transistor (TFT) array substrate 524, and second pixel electrode 516 and second counter electrode 518 are all towards thin-film transistor array base-plate 522.In addition, second pixel electrode 516 and second counter electrode 518 can comprise finger electrode respectively, 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, make win pixel electrode 506 and second counter electrode 518 have different potentials (as: current potential of negative value and on the occasion of current potential) respectively, and first counter electrode 508 and 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 first pixel electrode 506 and second counter electrode 518 perpendicular to the vertical electric field of first transparency carrier 402 and second transparency carrier 412, and be formed between first counter electrode 508 and second pixel electrode 516, 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 preferable tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character because of the formation of vertical electric field.
On the other hand, also can apply operating voltage to blue phase liquid crystal display device 500, make and 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 first pixel electrode 506 and first counter electrode 508, or apply a voltage to second pixel electrode 516 and second counter electrode 518, make it have different potentials respectively, and transverse electric field is formed between first pixel electrode 506 and first counter electrode 508, or be formed between second pixel electrode 516 and second counter electrode 518, make it present bright attitude so as to the polymer-stabilized eurymeric blue phase liquid crystal of drive controlling.
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 second pixel electrode 616 and second counter electrode 618, wherein second pixel electrode 616 and second counter electrode 618 are landscape configuration, be positioned at the inboard of second transparency carrier 412 and face first transparency carrier 402, and between second vertical electrode 614 and first vertical electrode 604.
Shown in Fig. 4 c, first vertical electrode 604 is with respect to 614 configurations of second vertical electrode, second pixel electrode 616 is with respect to 608 configurations of first counter electrode, and second counter electrode 618 is with respect to 606 configurations of first pixel electrode, make win vertical electrode 604, first pixel electrode 606 and first counter electrode 608 all towards colored filter film transistor (TFT) array substrate 624, the second vertical electrodes 614, second pixel electrode 616 and second counter electrode 618 all towards thin-film transistor array base-plate 622.In addition, second pixel electrode 616 and second counter electrode 618 also can comprise finger electrode respectively, 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, make and win between the vertical electrode 604 and second vertical electrode 614, between first pixel electrode 606 and second counter electrode 618 and between first counter electrode 608 and second pixel electrode 616, can form vertical electric field perpendicular to first transparency carrier 402 and second transparency carrier 412, 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 preferable tropisms such as optics, produce the phenomenon of dark attitude light leak with effective minimizing because of its structure self character because of the formation of vertical electric field.
On the other hand, also can apply operating voltage to blue phase liquid crystal display device 600, make and 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 first pixel electrode 606 and first counter electrode 608, or be formed between second pixel electrode 616 and second counter electrode 618, make it present bright attitude so as to the polymer-stabilized eurymeric blue phase liquid crystal of drive controlling.
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, 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 first vertical electrode 704, second vertical electrode 714, first pixel electrode 706, first counter electrode 708, second pixel electrode 716 and second counter electrode 718, all different with the voltage that applied among Fig. 4 c.Specifically, the current potential of first counter electrode 708 and second counter electrode 718 can be set at 0 volt, the current potential of first vertical electrode 704 and first pixel electrode 706 can be set on the occasion of, and the current potential of first vertical electrode 704 is less than the current potential of first pixel electrode 706, and for example the current potential of the current potential of first vertical electrode 704 and first pixel electrode 706 is respectively 5 volts and 10 volts.In addition, the current potential of second vertical electrode 714 and second pixel electrode 716 can be set at negative value, and the current potential of second vertical electrode 714 is greater than the current potential of second pixel electrode 716, and for example the current potential of the current potential of second vertical electrode 714 and second pixel electrode 716 is respectively-5 volts and-10 volts.
Thus, between first vertical electrode 704 and second vertical electrode 714, between second pixel electrode 716 and first counter electrode 708, and second between counter electrode 718 and first pixel electrode 706, just can form vertical electric field respectively equally, and between first vertical electrode 704 and first counter electrode 708, between second vertical electrode 714 and second counter electrode 718, between first pixel electrode 706 and first counter electrode 708, and can form transverse electric field respectively equally between second pixel electrode 716 and second counter electrode 718.
The material of the electrode in the foregoing description can comprise tin indium oxide (ITO), indium zinc oxide transparent conductive materials such as (IZO) according to actual demand, or poly-dioxoethyl plug fen conducting polymers such as (PEDOT), but, also be that in fact the electrode of the embodiment of the invention can comprise any material with satisfactory electrical conductivity not as limit.
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 controlling the penetrance of polymer-stabilized eurymeric blue phase liquid crystal in the blue phase liquid crystal layer 410 effectively, and reduce the phenomenon of dark attitude light leak.
Fig. 5 be under 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 wherein polymer-stabilized eurymeric blue phase liquid crystal operating voltage that it applied under the situation of different vertical electric field and light transmittance.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, with operating voltage 0V is example, polymer-stabilized eurymeric blue phase liquid crystal is under unguyedization voltage condition, 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 solidifies voltages and 25 volts and solidifies under the voltage condition applying 5 volts, its situation that produces dark attitude light leak just improve gradually (as: light transmittance T with solidify voltage increase lower).In addition, as shown in the figure, even if polymer-stabilized eurymeric blue phase liquid crystal is applied operating voltage and operates, applying under 25 volts of curing voltage condition, 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 promptly 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 be along with the intensity of solidifying the vertical electric field that voltage produced increases and reduce.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 increase along with the intensity of vertical electric field and reduce.For instance, the light transmittance of blue phase liquid crystal is to reduce 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 as can be known by the data after the normalization shown in Figure 5, 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 under 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 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 tropisms such as perfect optics, and then cause blue phase liquid crystal to have dark attitude light leak, and reduce the contrast of show image simultaneously.
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, make blue phase liquid crystal in the photopolymerization process, be subjected to the effect of vertical electric field simultaneously, can make polymer-stabilized eurymeric blue phase liquid crystal under actual conditions, level off to tropisms such as optics more so as to compensation, reducing the situation of dark attitude light leak, and promote the contrast of showing image simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, 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 one first substrate relatively and be parallel to one 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 a voltage in this first electrode of this first substrate and this second electrode of this second substrate, make to form a vertical electric field perpendicular to this first electrode and this second electrode in this blue phase liquid crystal layer; And
Shine a light source in this blue phase liquid crystal layer, 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 first electrode of this first substrate comprises one first vertical electrode, and this second electrode of this second substrate 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 first electrode of this first substrate comprises a pair of to electrode, and this second electrode of this second substrate 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 first electrode of this first substrate comprises one first vertical electrode and a subtend electrode, this second electrode of this second substrate 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, this voltage that puts on this first electrode and this second electrode is between about 2 volts to about 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 about 60 ℃ approximately.
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 voltage, make and 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, make this polymerization single polymerization monomer carry out polyreaction and produce this polymer-stabilized eurymeric blue phase liquid crystal.
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 pair of to 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 voltage that this first electrode and this second electrode are applied is between about 2 volts to about 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 about 60 ℃ approximately.
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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