Background technology
Along with the development of technique of display, liquid-crystal display (Liquid Crystal Display, LCD) occupies dominant position in flat display field.Liquid-crystal display is divided into transmission-type (transmissive), reflective (reflective) and transflective (transflective, also referred to as half-transmission half-reflection type, Transflective) Three models.Transmissive type liquid crystal display needs to use backlight, and power consumption is large, visual poor under high light, and its advantage is visual good under darker environment.Reflective liquid-crystal display, without backlight, utilizes baffle reflection extraneous light, low in energy consumption, but visual poor under darker environment.The mode that transflective liquid crystal indicating meter utilizes transmission mode and reflective-mode to combine, to show image, therefore has the advantage of transmission-type and reflective liquid-crystal display concurrently, has very large surround lighting subject range, can use under any surround lighting.
In transflective liquid crystal panel, light passes once from the liquid crystal of transmission area, and through twice from the liquid crystal of echo area, light is different with light path by path, causes at the phase-delay quantity of transmission area and echo area variant.In order to make transmission area and echo area have identical optical delay, transflective liquid crystal panel is divided into again dual-box thick pattern and the thick pattern of single box two kinds of patterns.
Dual-box thick pattern is by adjusting the thickness of liquid crystal box of transmission area and echo area, the thick twice of echo area liquid crystal cell is designed to by thick for the liquid crystal cell of transmission area, make the optical delay of transmission area and echo area equal, but dual-box thick mode liquid crystal panel is difficult to the thick homogeneity of accurate control enclosure, and irregular at the liquid crystal aligning of transmission area and echo area intersection, easily cause light leak.
The thick pattern of single box is divided into again two kinds, and the first increases optical delay layer of compensation in transmission area to compensate the optical delay that the path difference due to transmission area and echo area causes poor, manufacturing process complexity, and cost is higher; The second is the thick pattern of the single box of mixing, do not need to make optical delay layer of compensation in box, but need to realize different tilt angles in transmission area and echo area, need in manufacturing processed to carry out repeatedly friction orientation to oriented layer, manufacturing process is complicated, and yield is lower.
Therefore, all there is complicate fabrication process in existing transflective liquid crystal panel, the technical problem that production efficiency is lower.
Summary of the invention
Embodiments provide a kind of form liquid crystal aligning layer composition, the preparation method of liquid crystal aligning layer, transflective liquid crystal panel and manufacture method, transflective liquid crystal display unit, solve existing transflective liquid crystal panel manufacturing process complicated, the technical problem that production efficiency is lower.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, the invention provides a kind of composition forming liquid crystal aligning layer, comprising polyimide (Polyimide, PI) and liquid crystal pre-polymers.
Preferably, the mass ratio of PI and liquid crystal pre-polymers is 1:0.8 ~ 1:1.
On the other hand, present invention also offers a kind of preparation method of liquid crystal aligning layer, described liquid crystal aligning layer is formed by the composition containing PI and liquid crystal pre-polymers, and described preparation method comprises:
Described composition is coated on substrate;
Carry out UV-light (UV) to the subregion of described oriented layer to irradiate;
Described liquid crystal aligning layer is heated;
Friction orientation is carried out to described liquid crystal aligning layer.
On the other hand, present invention also offers a kind of transflective liquid crystal panel, comprise first substrate and second substrate, described first substrate and second substrate comprise transmission area and echo area, are respectively arranged with oriented layer on described first substrate and second substrate,
Described oriented layer is formed by the composition containing PI and liquid crystal pre-polymers;
The tilt angle of the oriented layer on described first substrate echo area is greater than the tilt angle of the oriented layer of described first substrate transmission area;
The tilt angle of the oriented layer on described second substrate echo area and transmission area is equal with the tilt angle of the oriented layer of described first substrate transmission area.
Preferably, the mass ratio of PI and liquid crystal pre-polymers is 1:0.8 ~ 1:1.
On the other hand, present invention also offers a kind of transflective liquid crystal display unit, comprise above-mentioned transflective liquid crystal panel.
On the other hand, present invention also offers a kind of transflective liquid crystal method for producing panel, described liquid crystal panel comprises first substrate and second substrate, described first substrate and second substrate comprise transmission area and echo area, be respectively arranged with oriented layer on described first substrate and second substrate, described manufacture method comprises:
Composition containing PI and liquid crystal pre-polymers is coated on first substrate;
Only UV-irradiation is carried out to the oriented layer of described first substrate transmission area;
Described first substrate oriented layer is heated;
Friction orientation is carried out to described first substrate oriented layer;
Described manufacture method also comprises:
Composition containing PI and liquid crystal pre-polymers is coated on second substrate;
UV-irradiation is carried out to described second substrate oriented layer;
Described second substrate oriented layer is heated;
Friction orientation is carried out to described second substrate oriented layer.
Preferably, the irradiation dose of described UV-irradiation is 500mJ/cm2above, best irradiation dose is 2000mJ/cm2.
Preferably, the Heating temperature of described heating is 200 ~ 230 DEG C, and heat-up time is 30-60 minute.
Compared with prior art, technique scheme tool provided by the present invention has the following advantages: PI has vertical orientated characteristic as the material of oriented layer, and liquid crystal pre-polymers meeting polymerization reaction take place after UV-irradiation, composition containing PI and liquid crystal pre-polymers is in the characteristic after UV-irradiation technique with horizontal alignment, after the composition coating on the first substrate containing PI and liquid crystal pre-polymers, the transmission area being subject to UV-irradiation will embody horizontal alignment characteristic; The echo area not being subject to UV-irradiation then embodies the vertical orientated characteristic of PI.Because transmission area and echo area have different orientation characteristics, after carrying out identical friction process to first substrate, transmission area and echo area will have different tilt angles.In addition, the transmission area of second substrate is identical with the tilt angle of the oriented layer of echo area, and equal the tilt angle of first substrate transmission area oriented layer, first substrate and second substrate are formed in the thick transflective liquid crystal panel of single box to box, transmission area and echo area just have different liquid crystal alignings, thus have identical optical delay.
Therefore, in technical scheme provided by the invention, do not need to place optical delay layer of compensation in liquid crystal panel, do not need to carry out repeatedly friction process yet, transmission area and echo area can be realized there is identical optical delay, solve existing transflective liquid crystal panel manufacturing process complicated, the technical problem that production efficiency is lower.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not paying creative work, all belongs to the scope of protection of the invention.
Embodiment 1:
Embodiments provide a kind of composition forming liquid crystal aligning layer, comprising polyimide (Polyimide, PI) and liquid crystal pre-polymers.As a preferred version, the mass ratio of PI and liquid crystal pre-polymers is 1:0.8 ~ 1:1.
The embodiment of the present invention additionally provides a kind of preparation method of liquid crystal aligning layer, and this liquid crystal aligning layer is formed by the composition containing the above-mentioned PI of comprising and liquid crystal pre-polymers, and this preparation method comprises:
S1: described composition is coated on substrate.
S2: UV-light (UV) is carried out to the subregion of oriented layer and irradiates.
S3: liquid crystal aligning layer is heated.
S4: friction orientation is carried out to liquid crystal aligning layer.
As shown in Figure 1, the embodiment of the present invention additionally provides a kind of transflective liquid crystal panel, comprises first substrate 1 and second substrate 2, and first substrate 1 and second substrate 2 comprise transmission area and echo area.In the present embodiment, the area ratio of transmission area and echo area is 1:1, respectively accounts for 1/2nd of pixel, certainly in other embodiments also can with other proportional distribution transmission area and echo area.
Oriented layer 11,21 is respectively arranged with on first substrate 1 and second substrate 2.The oriented layer 11 of first substrate 1 is formed by the composition of above-mentioned PI and liquid crystal pre-polymers, and wherein the mass ratio of PI and liquid crystal pre-polymers can be chosen between 1:0.8 to 1:1, the two is mixed and stirs 5-8 hour, then be cooled to room temperature namely can be used for make oriented layer.
On first substrate 1, the tilt angle of the oriented layer 11 of echo area is greater than the tilt angle of the oriented layer 11 of transmission area.The oriented layer 11 of first substrate 1 by above-mentioned PI and liquid crystal pre-polymers composition and make through above-mentioned preparation method, be wherein that UV-irradiation is carried out to the transmission area of oriented layer 11 in step S2, and UV-irradiation is not carried out in the echo area of oriented layer 11.In concrete enforcement, ultraviolet baffle plate 4 can be utilized in UV-irradiation process to shelter from echo area (as shown in Figure 2), can realize carrying out UV-irradiation separately to transmission area.The irradiation dose of UV-irradiation technique usually will at 500mJ/cm2above, in the present embodiment, irradiation dose is 2000mJ/cm2.
On second substrate 2, the tilt angle of the oriented layer 21 on echo area and transmission area is equal, and equal with the tilt angle of the oriented layer 11 of first substrate 1 transmission area.The oriented layer 21 of second substrate 2 is also made up of the composition of above-mentioned PI and liquid crystal pre-polymers, preparation process is also similar with the oriented layer 11 of above-mentioned first substrate 1, just in step s 2 all UV-irradiation is carried out to the echo area of oriented layer 21 and transmission area, thus make echo area equal with the tilt angle of the oriented layer 21 of transmission area, and equal the tilt angle of the oriented layer 11 of first substrate 1 transmission area.
In the transflective liquid crystal panel that the embodiment of the present invention provides, PI has vertical orientated characteristic as the material of oriented layer, and liquid crystal pre-polymers meeting polymerization reaction take place after UV-irradiation, composition containing PI and liquid crystal pre-polymers is in the characteristic after UV-irradiation technique with horizontal alignment, after the composition coating on first substrate 1 containing PI and liquid crystal pre-polymers, the transmission area being subject to UV-irradiation will embody horizontal alignment characteristic; The echo area not being subject to UV-irradiation then embodies the vertical orientated characteristic of PI.Because transmission area and echo area have different orientation characteristics, after carrying out identical friction process to first substrate 1, the oriented layer 11 of transmission area and echo area will have different tilt angles.In addition, the transmission area of second substrate 2 is identical with the tilt angle of the oriented layer 21 of echo area, and equal the tilt angle of first substrate 1 transmission area oriented layer 11, first substrate 1 and second substrate 2 pairs of boxes and formed in the thick transflective liquid crystal panel of single box, transmission area and echo area just have different liquid crystal alignings, form the arrangement form of liquid crystal molecule 3 as shown in Figure 1, thus there is identical optical delay.
Therefore, the transflective liquid crystal panel that the embodiment of the present invention provides, do not need to place optical delay layer of compensation in liquid crystal panel, do not need to carry out repeatedly friction process yet, transmission area and echo area can be realized there is identical optical delay, solve existing transflective liquid crystal panel manufacturing process complicated, the technical problem that production efficiency is lower.
Should be noted that, liquid crystal panel is become box-like with array substrate by color membrane substrates usually, owing to only improving oriented layer in the present embodiment, therefore both can using color membrane substrates as the first substrate in the present embodiment, array substrate is as the second substrate in the present embodiment; Also can using array substrate as the first substrate in the present embodiment, color membrane substrates is as the second substrate in the present embodiment.
Embodiment 2:
The embodiment of the present invention provides a kind of transflective liquid crystal display unit, and can be specifically TV, computer, mobile phone etc., this transflective liquid crystal display unit comprises the transflective liquid crystal panel provided in embodiment 1.
The transflective liquid crystal display unit provided due to the embodiment of the present invention has identical technical characteristic with the transflective liquid crystal panel that embodiment 1 provides, so also can produce identical technique effect, solves identical technical problem.
Embodiment 3:
Embodiments provide a kind of manufacture method of transflective liquid crystal panel, this liquid crystal panel comprises first substrate and second substrate, first substrate and second substrate comprise transmission area and echo area, are respectively arranged with oriented layer on first substrate and second substrate.This manufacture method comprises:
S11: by the composition coating containing PI and liquid crystal pre-polymers on the first substrate.
In composition in the present embodiment, the mass ratio of PI and liquid crystal pre-polymers can be chosen between 1:0.8 to 1:1, the two is mixed and stirs 5-8 hour, then is cooled to room temperature and is namely coated on first substrate by transfer plate, so that the making of follow-up oriented layer.
S12: only UV-irradiation is carried out to the oriented layer of first substrate transmission area.
As shown in Figure 2, utilize UV-light baffle plate 4 to shelter from the echo area of each pixel on first substrate 1, the distance vertical range between UV-light baffle plate 4 and first substrate 1 between 0.5-1mm, then can carry out UV-irradiation.The irradiation dose of UV-irradiation usually will at 500mJ/cm2above, in the present embodiment, irradiation dose is 2000mJ/cm2.
Fig. 3 by different irradiation dose lower the graphic representation of simultaneous test of tilt angle of formation oriented layer.As can be seen from Figure 3, be not subject to UV-irradiation, the tilt angle of formed oriented layer of directly carrying out heating and rub is 88.5 °.Through 500mJ/cm2above irradiation dose, then carry out heating process and friction process, the tilt angle of the oriented layer formed starts considerable change occurs, when irradiation dose is 2000mJ/cm2time, the tilt angle of the oriented layer formed reaches minimum value 4.4-4.6 °.Irradiation dose continues to increase again, and the tilt angle of the oriented layer formed also can not significantly reduce again, for cost and the consideration of process time, there is no need to increase irradiation dose again, therefore 2000mJ/cm in the UV-irradiation technique of reality2irradiation dose be the preferred embodiment of the present embodiment.
S13: first substrate oriented layer is heated.
Sent into by first substrate in process furnace, heat oriented layer, usual Heating temperature is between 200-230 DEG C, and heat-up time is 30-60 minute.Heating temperature in the present embodiment is 200 DEG C, and heat-up time is 40 minutes, solidifies to make first substrate oriented layer.
S14: friction orientation is carried out to first substrate oriented layer.
Carry out friction orientation to the oriented layer after solidification, the present embodiment selects CFT-053 friction cloth, and the rotating speed of friction roller is 1000rpm, and the travelling speed of base station is 40mm/sec, and friction cloth depression depths is 0.5mm.
The manufacture method of the thick transflective liquid crystal panel of this single box also comprises:
S21: the composition containing PI and liquid crystal pre-polymers is coated on second substrate.
S22: UV-irradiation is carried out to described second substrate oriented layer.
UV-irradiation process and above-mentioned steps S12 are substantially identical, and difference is, do not arrange UV-light baffle plate, and all carry out UV-irradiation to the oriented layer of second substrate transmission area and echo area in this step.
S23: second substrate oriented layer is heated.
S24: friction orientation is carried out to second substrate oriented layer.
The step S21, S23 with S24 that carry out second substrate are identical with step S11, S13 with S14 carried out first substrate, repeat no more herein.
After the oriented layer of first substrate and second substrate completes, can be undertaken box packaging process by first substrate and second substrate, form liquid crystal panel, wherein the box of liquid crystal cell is thick is 4.1 μm.As shown in Figure 1, the tilt angle of the transmission area in liquid crystal panel formed like this is 4.4-4.6 °, the tilt angle of echo area is 88.5 ° simultaneously, thus the optical delay achieving transmission area is λ/2, then the optical delay that light once produces through transmission area is λ/2; Simultaneously the optical delay of echo area is λ/4, then the optical delay that light produces behind echo area twice is also λ/2, thus the optical delay that light is produced in transmission area and echo area is equal.
In the manufacture method of the transflective liquid crystal panel that the embodiment of the present invention provides, PI has vertical orientated characteristic as the material of oriented layer, and liquid crystal pre-polymers meeting polymerization reaction take place after UV-irradiation, composition containing PI and liquid crystal pre-polymers is in the characteristic after UV-irradiation technique with horizontal alignment, after the composition coating on the first substrate containing PI and liquid crystal pre-polymers, the transmission area being subject to UV-irradiation will embody horizontal alignment characteristic; The echo area not being subject to UV-irradiation then embodies the vertical orientated characteristic of PI.Because transmission area and echo area have different orientation characteristics, after carrying out identical friction process to first substrate, the oriented layer of transmission area and echo area will have different tilt angles.In addition, second substrate is without UV-irradiation, and directly carry out heating process and friction process, so transmission area is identical with the tilt angle of the oriented layer of echo area, and equaling the tilt angle of first substrate transmission area oriented layer, first substrate and second substrate are formed box in the thick transflective liquid crystal panel of single box, and transmission area and echo area just have different liquid crystal alignings, form the arrangement form of liquid crystal molecule as shown in Figure 1, thus there is identical optical delay.
Therefore, the transflective liquid crystal panel made by the manufacture method in the embodiment of the present invention, do not need to place optical delay layer of compensation in liquid crystal panel, do not need to carry out repeatedly friction process yet, transmission area and echo area can be realized there is identical optical delay, solve existing transflective liquid crystal panel manufacturing process complicated, the technical problem that production efficiency is lower.
It should be noted that step S11-S14 in the embodiment of the present invention and step S21-S24 carries out first substrate and second substrate respectively, the sequencing that therefore step S11-S14 and step S21-S24 is unfixing.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.