CN100376986C

CN100376986C - Liquid crystal panel and method for manufacturing same

Info

Publication number: CN100376986C
Application number: CNB2005100004605A
Authority: CN
Inventors: 郑德胜; 杨凯能; 戴嘉萱
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2005-01-11
Filing date: 2005-01-11
Publication date: 2008-03-26
Anticipated expiration: 2025-01-11
Also published as: CN1632649A

Abstract

The invention discloses an ODF liquid crystal panel and a manufacturing method thereof, wherein the liquid crystal panel comprises an upper substrate and a lower substrate, and the method comprises the following steps: 1) the upper surface of the lower substrate and the lower surface of the upper substrate are coated with initial materials of an alignment film, including PI and PAA. 2) A hard baking step is carried out to convert the PAA into PI, and the PI content of the alignment film is 70% -90% of that of the alignment film when the alignment film is completely converted. 3) Forming a frame glue on the peripheral part of the upper surface of the lower substrate. 4) Providing at least one liquid crystal drop on the central part of the lower substrate. 5) And (4) overlapping the upper substrate and the lower substrate under the condition of low air concentration.

Description

Liquid crystal panel and manufacture method thereof

Technical field

The present invention relates to a kind of liquid crystal panel and manufacture method thereof, particularly about liquid crystal panel and the manufacture method thereof of a kind of ODF (One DropFill).

Background technology

Liquid crystal panel is the key element in the flat-panel screens, and its primary structure is to be packaged with liquid crystal (Liquid Crystal) between two plate bases.Among above-mentioned two plate bases, wherein a substrate has the pixel electrode of arrayed, in order to the anglec of rotation of control liquid crystal molecule; Another substrate then has color filter film, is used for making liquid crystal panel to be presented colored image.Liquid crystal then usually by interlayer between this two plate base, and the peripheral part between two plate bases is to utilize frame glue (sealant) to finish the encapsulation of liquid crystal.

Known LCD panel manufacturing method utilizes Figure 1A-C to illustrate.Shown in Figure 1A, at first will insert in the vacuum tank (chamber) 10 two plate bases 12 of envelope, two plate bases 12 comprise upper substrate 121 and infrabasal plate 123, pixel electrodes with arrayed wherein, another person has color filter film; This time-frame glue 13 has been looped around the peripheral part between two plate bases 12, only keeps an opening 14, so that at follow-up injection liquid crystal.At this moment, reduce the air pressure in the vacuum tank 10 by bleeding, and carry out the hot tempering of a vacuum (vacuum anneal) step, can be extracted fully to guarantee aqueous vapor.Wherein, the aperture of opening 14 is about 1cm, and the liquid crystal panel of size less (7 o'clock following) keeps an opening 14 usually, and the size liquid crystal panel of big (greater than 15 o'clock) then may keep opening 14 more than two.

Shown in Figure 1B, then then inject the step of liquid crystal, liquid crystal utensil 16 (LC boat) is aimed at above-mentioned opening 14, then then to vacuum tank 10 injecting gas (being generally the inert gas of nitrogen and so on), make the air pressure of two plate bases, 12 inside less than its outside air pressure, utilize the capillarity between this pressure reduction and two plate bases 12, the liquid crystal in the liquid crystal utensil 16 can be full of 12 of two plate bases (is that example is full of from lower to upper with Figure 1B).After the injection of finishing liquid crystal, then this opening 14 is mended frame glue, finish last encapsulation.12 of two plate bases finishing encapsulation are shown in Fig. 1 C.

Yet above-mentioned this kind utilizes pressure reduction and capillarity consuming time very huge in the step of injecting liquid crystal usually with the method for injecting liquid crystal.The less liquid crystal panel of size takes the injection of finishing liquid crystal in 3-5 hour approximately; And larger-size liquid crystal panel even may need to surpass one day time.

Therefore in known techniques, develop another and be called the liquid crystal implantttion technique of ODF (One Drop Fill).For example, the U.S. the 5th, 263, the technology that No. 888 patent disclosed is an example.With next Fig. 2 A-C brief introduction ODF technology of utilizing.

Shown in Fig. 2 A, it carries out the setting of frame glue 13 earlier for the arbitrary plate base 121 in above-mentioned two plate bases 12 (being designated hereinafter simply as " infrabasal plate 121 ").Frame glue 13 is arranged at peripheral part of infrabasal plate 121 upper surfaces.

Then shown in Fig. 2 B, utilize distinctive duckbill dropper (nozzle tip) 20 in the ODF technology, splash into liquid crystal 22 at the upper surface of infrabasal plate 121.This kind duckbill dropper 20 can be by splashing into " one " liquid crystal 22, and make liquid crystal 22 be paved with infrabasal plate 121 upper surfaces gradually, so this kind liquid crystal implantttion technique obtains the address of ODF-One Drop Fill.

The development of ODF technology mainly is to be conceived to improve the described liquid crystal injection time of Figure 1A-C problem too consuming time, therefore when actual embodiment ODF technology, be not limited to a duckbill dropper 20 or a dropping liquid crystalline substance 22, can shown in Fig. 2 B, utilize a plurality of duckbill droppers 20 to quicken the injection of liquid crystal 22.Utilize above-mentioned technology, no matter the size of liquid crystal panel size, we can be about to finish under the required liquid crystal drop of panel in a few minutes.

At last then shown in Fig. 2 C, among infrabasal plate 121 immigration vacuum tanks 10.Other plate base 123 (hereinafter to be referred as " upper substrate 123 ") in two plate bases 12 is also inserted in the vacuum tank 10 this moment.Under low air concentration (being often referred to) less than 1pa, upper substrate 123 from top to bottom, and infrabasal plate 121 with liquid crystal 22 interlayers between the two; 13 in frame glue by infrabasal plate 121 upper surfaces can be in conjunction with upper and lower substrate 123,121.Follow-up frame glue 13 irradiating ultraviolet light and heating are made its curing.

What deserves to be mentioned is that the upper surface of the lower surface of upper substrate 123 and infrabasal plate 121 is to be coated with alignment film, directly contact, be used for controlling the orientation of molecule when not being subjected to regulating and controlling voltage of liquid crystal 22 with liquid crystal 22.Generally speaking, the alignment film of upper and lower substrate 123,121 can make liquid crystal 22 have specific directivity, in the coupling angle of alignment film of the two of need accurately harmonizing in 123,121 o'clock in conjunction with upper and lower substrate.The step of this angle adjustment (aligner) also is to influence the very huge committed step of liquid crystal panel quality.In the ODF technology, be before upper and lower substrate 123,121 combinations of Fig. 2 C, to carry out the angle alignment step; And in more known LCD panel manufacturing method, then before 12 pairs of envelopes of two plate bases shown in Figure 1A, promptly carried out the angle alignment step.

The ODF technology has a great shortcoming.Please refer to Fig. 3, Fig. 3 is the liquid crystal panel schematic perspective view that utilizes the ODF technology to make.Can occur cloud point (mura) 24 as shown in Figure 3 during liquid crystal panel 8 show images, the position that these a little cloud points 24 form just and shown in Fig. 2 B, duckbill dropper 20 is consistent in the position that infrabasal plate 121 upper surfaces splash into liquid crystal 22 drops.And this kind cloud point 24 is not exist in LCD panel manufacturing method more known shown in Figure 1A-C.The formation of therefore general inference cloud point 24 is relevant with the ODF technology, and these a little cloud points 24 are called ODF mura.

The inventor thinks be the origin cause of formation of above-mentioned ODF mura phenomenon because it is not to carry out that duckbill dropper 20 splashes into the step of liquid crystal 22 (shown in Fig. 2 B), and also do not have the hot tempering of the vacuum of imposing before splashing into liquid crystal 22 among vacuum tank 10.Therefore, having aqueous vapor partly is attached in the alignment film of infrabasal plate 121 upper surfaces.The material of alignment film is mixed by poly-inferior acyl ammonia (polyimide is commonly called as PI) and polyamic acid (polyamicacid is commonly called as PAA) usually.The chemical formulation of PI is suc as formula one:

PAA contains acid group, therefore suction easily.The chemical formulation of PAA is suc as formula two:

Though the step of Fig. 2 C is to move in the vacuum tank 10 to carry out, yet when Fig. 2 B liquid crystal droplet 22 splashed into infrabasal plate 121 upper surfaces, the part aqueous vapor was covered and can't be drained by liquid crystal 22 drops, causes above-mentioned those cloud points 24 and ODF mura phenomenon.Yet known ODF technology is not carried out the reason of the step that liquid crystal droplet splashes in vacuum tank 10, be because this step is difficult for operation in vacuum tank 10, and relevant utensil (for example the duckbill dropper 20) also is difficult for inserting among the vacuum tank 10.If ODF technology and the special vacuum tank that share does not then meet cost benefit again.

In this case, how improving ODF mura phenomenon, make the liquid crystal panel related industry be utilized the ODF technology can shorten the advantage of liquid crystal injection time, and help the competitive power of industry, is the emphasis of current techniques development.And the Technology Need of new development meets cost benefit, so that new technology really is applied on the production line of liquid crystal panel.

Therefore, for the research staff who is engaged in the liquid crystal panel association area, there's no one who doesn't or isn't be devoted to solve the shortcoming that known techniques still has, in the hope of can further improving the quality of liquid crystal panel product, and help the development of industry.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of ODF (One Drop Fill) liquid crystal panel and manufacture method thereof, improves the ODF mura phenomenon in the known techniques.

Another object of the present invention is to provide a kind of liquid crystal panel and manufacture method thereof, make the ODF technology of new development meet cost benefit, really be applied on the production line of liquid crystal panel.

For this reason, the present invention proposes a kind of LCD panel manufacturing method, this liquid crystal panel comprises a upper substrate and an infrabasal plate, this method comprises the following steps: to be coated with the original material of an alignment film in this infrabasal plate upper surface and this upper substrate lower surface, this original material comprises poly-inferior acyl ammonia (polyimide, PI) with polyamic acid (polyamic acid, PAA); Carry out a hard roasting step (post bake) so that polyamic acid (PAA) changes into poly-inferior acyl ammonia (PI), wherein, poly-inferior acyl ammonia (PI) content that this roasting firmly step continues to this alignment film when transforming fully 70%～90%; Form a frame glue in peripheral part of this infrabasal plate upper surface; Provide at least one liquid crystal droplet on this alignment film that this frame glue centers on; And superimposed this upper substrate and this infrabasal plate are packaged in this upper and lower substrate and this frame glue institute area surrounded this liquid crystal droplet.

Preferable, the poly-inferior acyl ammonia content of the original material of this alignment film, when transforming fully 40%～65%.

Preferable, before this forms the step of this frame glue, more comprise a friction orientation step.

Preferable, before the step that this upper substrate and this infrabasal plate is superimposed, more comprise an angle (aligner) step of harmonizing.

Preferable, after this firmly roasting step, more comprise a detecting step, with the poly-inferior acyl ammonia content of definite this alignment film when transforming fully 70%～90%.

Preferable, this detecting step is utilized Fu Shi infrared spectrometer (FTIR).

Preferable, this detecting step is that this alignment film and its reference sample (reference) that transforms are fully compared; The formation condition of this reference sample is to bake (PI postbaking) about 60 minutes so that 300 degree Celsius are hard.

Preferable, this detecting step is detecting C-N key (1380cm ^-1) to phenyl ring (benzene ring, 1510cm ^-1) the light absorption ratio.

Preferable, this detecting step is detecting C=O key (1780cm ^-1) to phenyl ring (benzene ring, 1510cm ^-1) the light absorption ratio.

Preferable, the temperature of this roasting firmly step is between 180 degree～240 degree Celsius.

Preferable, under a low air concentration, that this upper substrate and this infrabasal plate is superimposed; Should low air concentration be meant less than 1Pa.

The present invention has also further proposed a kind of liquid crystal panel, comprising: an infrabasal plate; One alignment film is formed at the lower surface of this infrabasal plate upper surface and upper substrate, and wherein this alignment film comprises 70%～90% poly-inferior acyl ammonia;

One frame glue is formed at peripheral part of this alignment film upper surface; One upper substrate sees through this frame glue and is incorporated into this infrabasal plate; And a liquid crystal molecule, filling is between this upper substrate and this infrabasal plate.

Liquid crystal panel comprises a upper substrate and an infrabasal plate.ODF LCD panel manufacturing method of the present invention at first is coated with the original material of an alignment film at the infrabasal plate upper surface, comprise poly-inferior acyl ammonia (polyimide, PI) with polyamic acid (polyamic acid, PAA).Then then carry out a hard roasting step so that PAA changes into poly-inferior acyl ammonia PI.The temperature that wherein should bake step firmly is between 180 degree～240 degree Celsius.And this moment alignment film PI content when transforming fully 70%～90%.After the alignment film setting of infrabasal plate is finished, form a frame glue in peripheral part of infrabasal plate upper surface.

Continuing provides the middle body of at least one liquid crystal droplet in infrabasal plate.It utilizes distinctive duckbill dropper (nozzle tip) in the ODF technology, splashes into liquid crystal with the upper surface at infrabasal plate.Can utilize a plurality of duckbill droppers to quicken the injection rate of liquid crystal, to shorten the processing procedure time during enforcement.

Move among the vacuum tank finishing infrabasal plate that liquid crystal injects, under low air concentration, that upper substrate and infrabasal plate is superimposed.The upper substrate lower surface has been formed with another alignment film, allows liquid crystal have specific directivity.And before upper substrate and infrabasal plate is superimposed, more comprise the step that an angle is harmonized, its under the environment of the low air concentration of vacuum tank, the coupling angle of the alignment film of the upper substrate of accurately harmonizing and the alignment film of infrabasal plate.Afterwards just by frame glue with in conjunction with upper and lower substrate, and finish the manufacturing of ODF liquid crystal panel of the present invention.Peripheral part between the upper and lower substrate is a frame glue, and liquid crystal is packaged in upper and lower substrate and the frame glue institute area surrounded.

The invention provides a kind of manufacture method of ODF liquid crystal panel, improved known ODF mura phenomenon, make the liquid crystal panel related industry be utilized the ODF technology to shorten the advantage of liquid crystal injection time, and help the competitive power of industry.And the present invention does not need special vacuum tank, can prolong with existing vacuum tank equipment, but can improve the problem of alignment film absorption aqueous vapor.Therefore, the present invention can say and meet cost benefit, and really is applied on the production line of liquid crystal panel.The present invention has reached the shortening liquid crystal panel overall process time simultaneously, met cost benefit and has promoted the liquid crystal panel quality ... wait the demand of industry development, will significantly promote the competitive power of industry.

Description of drawings

Figure 1A-C represents known LCD panel manufacturing method;

The known ODF technology of Fig. 2 A-C brief introduction;

Fig. 3 is the liquid crystal panel schematic perspective view that utilizes the ODF technology to make;

Fig. 4 A～D represents ODF LCD panel manufacturing method of the present invention;

Fig. 5 is a FTIR spectrum; And

Fig. 6 is a liquid crystal panel side diagrammatic cross-section of the present invention.

The drawing reference numeral explanation:

Liquid crystal panel 8 vacuum tanks 10

Two plate bases, 12 openings 14

Liquid crystal utensil 16 infrabasal plates 121,321

Frame glue

13,33 duckbill droppers 20,40

Liquid crystal

22,42 upper substrates 123,323

Cloud point 24

alignment films

35,37

Embodiment

Please refer to Fig. 4 A～Fig. 4 D, it represents ODF LCD panel manufacturing method of the present invention.Liquid crystal panel 32 comprises a upper substrate 323 and an infrabasal plate 321.As Fig. 4 A, it at first is coated with an alignment film 35 at infrabasal plate 321 upper surfaces original material, comprise poly-inferior acyl ammonia (polyimide, PI) with polyamic acid (polyamicacid, PAA).Then carry out a hard roasting step (post bake) and make polyamic acid (PAA) change into poly-inferior acyl ammonia (PI), suc as formula three:

The temperature that wherein should bake step firmly is between 180 degree～240 degree Celsius.And this moment alignment film 35 poly-inferior acyl ammonia (PI) content when transforming fully 70%～90%.

Please continue A,, then continue and carry out the orientation step that rubs, make alignment film 35 have a specific directivity if this moment, liquid crystal panel 32 be TN-TFT mode, IPS mode or OCB is mode with reference to Fig. 4.The friction orientation step is that for example flannelette roller is bestowed on the surface of alignment film 35, carries out the forward mechanical friction behavior of contact.Friction the energy of confession make the PI high polymer main chain forward arrange because of extension, reach the purpose of giving alignment film one certain party tropism.This step has can be in normal-temperature operation, and extremely short benefit of running time, is very beneficial for the volume production of product.Among another embodiment,, then can not handle via friction matching if liquid crystal panel 32 is VA mode.

Please refer to Fig. 4 B.After alignment film 35 settings of infrabasal plate 321 are finished, then form a frame glue 33 in peripheral part of infrabasal plate 321 upper surfaces.The step that continues provides at least one liquid crystal 42 drops on the infrabasal plate 321 that frame glue 33 centers on then as Fig. 4 C.It utilizes distinctive duckbill dropper (nozzle tip) 40 in the ODF technology, splashes into liquid crystal 42 with the upper surface (being alignment film 35) at infrabasal plate 321.Can shown in Fig. 4 C, utilize a plurality of duckbill droppers 40 to quicken the injection rate of liquid crystal 42 during enforcement, shorten the processing procedure time.No matter liquid crystal panel 32 sizes can be finished the injection of liquid crystal 42 in short 1-2 minute.

Please refer to Fig. 4 D.The infrabasal plate 321 that to finish liquid crystal 42 injections this moment moves among the vacuum tank 10, also upper substrate 323 is moved into this moment among the vacuum tanks 10, and is under low air concentration (below the 1pa), that upper substrate 323 and infrabasal plate 321 is superimposed.Upper substrate 323 lower surfaces have been formed with another alignment film 37, and have specific directivity.And before upper substrate 323 and infrabasal plate 321 is superimposed, more comprise the step that an angle is harmonized (aligner), its under the environment of the low air concentration of vacuum tank 10, the coupling angle of the alignment film of the upper substrate 323 of accurately harmonizing 37 and the alignment film 35 of infrabasal plate 321.Afterwards just by frame glue 33 in conjunction with upper and lower substrate 323,321, we can utilize the method for ultraviolet light irradiation to add that thermmohardening is solidified frame glue 33, to finish the manufacturing of ODF liquid crystal panel 32 of the present invention.Peripheral part between the upper and lower substrate 323,321 is a frame glue 33, and liquid crystal 42 is packaged in upper and lower substrate 323,321 and 33 area surrounded of frame glue.

Compared to known techniques, the present invention forms by alignment film 35 material wherein of control infrabasal plate 321, and makes alignment film 35 tool low water absorbables.The original material of alignment film 35 comprises PI and PAA.PI has high mechanical properties, thermotolerance is good, electric insulating quality is good, chemically-resistant solvent and radiant rays ... etc. the macromolecular material of material behavior.Therefore, even PI directly contacts with liquid crystal 42, perhaps have under the environment of heat energy and voltage when liquid crystal panel 32 operation, PI also can have good stability of material, and is enough to provide liquid crystal panel 32 stable display quality.

Yet the printing of PI is not good, is not easy directly to be coated with or to be attached to infrabasal plate 321 or upper substrate 323 surfaces.So typically the practice is PI can be mixed with PAA to help coating, afterwards just to bake step (post bake) firmly so that PAA changes into PI (formula three).But often reckoning without a large amount of side chain radicals (side chain) in the known techniques can cause the conversion ratio of PAA actual PI of aggregating into after roasting step really up to the mark not high.Then cause thus in the known techniques, aqueous vapor is contained the PAA absorption of acid group, and the known shortcoming that causes aqueous vapor to be drained after liquid crystal (Fig. 2 B label 22) splashes into, and then causes ODF mura phenomenon.

The inventor finds in experiment repeatedly, when alignment film 35 after hard roasting step, PI content wherein is when if 70% (containing) can reach it and transform (PAA changes into PI) fully the time is above, then then loses ODF mura phenomenon during the photoelectricity test of liquid crystal panel 32 before dispatching from the factory.But if 100% conversion lacks PAA and then can cause the printing of alignment film 35 and adhesion low.Therefore actual 70%～90% when being fit to transform fully for it with the PI content of avoiding ODF mura phenomenon.The embodiment that preferable effect is arranged is then between 75%～80%.

In order to keep the stable of liquid crystal panel 32 product quality, therefore in the present invention, can determine that before splashing into liquid crystal 42, the PI of alignment film 35 has reached required content by a detecting step.This detecting step is to utilize Fu Shi infrared spectrometer (FTIR) to carry out, and detects the conversion ratio of PI with detecting imidization ratio.And alignment film 35 samples (hereinafter to be referred as Sample) that the reference sample (hereinafter to be referred as Reference) that wherein utilizes employed PI to transform fully to have finished hard roasting step with Fig. 4 A compare.Reference has 100% PI, 0% PAA, and hard roasting (PI post baking) temperature of this reference PI is 300 degree Celsius 60 minutes.C-N key, phenyl ring (benzene ring) that this detecting step has utilized the molecular formula (suc as formula) of PI to be had carry out the detecting of the PI conversion ratio of Sample with the C=O key.

Please refer to Fig. 5, it is the FTIR spectrum of a PI alignment film.Transverse axis is a light frequency, and the longitudinal axis is first absorption intensity.Curve I represents the Sample I of low PI conversion ratio (30%).The Sample II of PI conversion ratio (80%) during curve II represents.Curve III represents the Reference (100%PI that transforms fully.Wherein at 1380cm ^-1Signal table C-N key, 1510cm ^-1Signal table phenyl ring (benzene ring), 1780cm ^-1Signal table C=O key.

Be to try to achieve the PI conversion ratio in one embodiment of the invention with following formula:

imidization ratio＝(X/Y)*100％

Wherein X represents the C-N key (1380cm of Sample ^-1) to phenyl ring (1510cm ^-1) the light absorption ratio; Y represents the C-N key (1380cm of Reference ^-1) to phenyl ring (1510cm ^-1) the light absorption ratio.By Fig. 5 and following formula as can be known, when the conversion ratio of PI is high more, then the imidization ratio value of following formula can be big more.

Try to achieve the PI conversion ratio with following formula in another embodiment of the present invention:

imidization ratio＝(Z/Y)*100％

Wherein Z represents the C=O key (1780cm of Sample ^-1) to phenyl ring (1510cm ^-1) the light absorption ratio; Y represents the C=O key (1780cmm of Reference ^-1) to phenyl ring (1510cmm ^-1) the light absorption ratio.By Fig. 5 and following formula as can be known, when the conversion ratio of PI is high more, then the imidization ratio value of following formula can be big more.

As mentioned above, the present invention detects step by this, under the situation of 70%～90% when the PI content in determining alignment film 35 transforms fully for it, continues and carries out follow-up step.Can avoid ODF mura phenomenon effectively thus, solve the shortcoming of known ODF technology.

Please refer to following table one, it is the tabular experimental data that a PAA is converted into PI:

	The PI initial content	The final content of PI	Water-intake rate	Printing	ODF mura
	The PI initial content	The final content of PI	Water-intake rate	Printing	ODF mura	Sample one	0％	30％	1.50％	Well	Obviously
Sample two	50％	80％	0.60％	Well	Do not have	Sample one	0％	30％	1.50％	Well	Obviously
Sample two	50％	80％	0.60％	Well	Do not have	Sample three	100％	100％	0.30％	Difference	Do not have

Test the result that accumulated repeatedly as can be known by table one and this case inventor, produce if 40% liquid crystal panel 32 when transforming fully has tangible ODF mura phenomenon through the PI content of the alignment film 35 of hard roasting step.If through the PI content of the alignment film 35 of hard roasting step when transforming fully 70%, the ODFmura phenomenon then can obviously be improved.

But, and consider that the temperature of baking step firmly is too high and probably can cause damage (substrate that particularly wherein has color filter film) upper and lower substrate 323,321 if will reach PI conversion ratio 70% or more; Therefore, temperature limitation is in the hard roasting step of 180 degree～240 degree Celsius, and the original material of alignment film 35 will contain the PI more than 40% at least, just is enough to reach the purpose of above-mentioned 70%PI conversion ratio.Yet the content of alignment film 35 original material PI also can not be too high, and as shown in Table 1, alignment film 35 original materials that contain 100%PI will lose printing fully, can't be coated with or be attached to infrabasal plate 321 or upper substrate 323 surfaces.Alignment film 35 original materials that contain 40%～65%PI can be taken into account printing and the effective range of improving ODF mura phenomenon when implementing.

Therefore, the invention provides a kind of liquid crystal panel 32, its technology that can utilize ODF is improved known ODF mura phenomenon to make yet have to imitate.Can be with reference to Fig. 6, Fig. 6 is a liquid crystal panel side diagrammatic cross-section of the present invention.Liquid crystal panel 32 comprises infrabasal plate 321, alignment film 35, frame glue 33, upper substrate 323 and liquid crystal molecule 42.Wherein, alignment film 35 is formed at infrabasal plate 321 upper surfaces, and wherein alignment film 35 comprises 70%～90% poly-inferior acyl ammonia.Frame glue 33 is formed at peripheral part of alignment film 35 upper surfaces.Upper substrate 323 sees through frame glue 33 and is incorporated into infrabasal plate 321, and its lower surface can be alignment film 37.42 fillings of liquid crystal molecule are in 321 of upper substrate 323 and infrabasal plates.

Comprehensive the above, the invention provides a kind of manufacture method of ODF liquid crystal panel, improved known ODF mura phenomenon, make the liquid crystal panel related industry be utilized the ODF technology to shorten the advantage of liquid crystal injection time, and help the competitive power of industry.And the present invention does not need special vacuum tank, can prolong with existing vacuum tank equipment, but can improve the problem of alignment film absorption aqueous vapor.Therefore, the present invention can say and meet cost benefit, and really is applied on the production line of liquid crystal panel.The present invention has reached the shortening liquid crystal panel overall process time simultaneously, conformed to cost benefit and has promoted the liquid crystal panel quality ... wait the demand of industry development, will significantly promote the competitive power of industry.

Though the present invention illustrates as above with preferred embodiments, so it is not in order to limit the present invention's spirit and invention entity, only to terminate in the foregoing description that.To being familiar with this operator, when understanding and utilize other element or mode to produce identical effect easily.Be with, the modification of being done in not breaking away from spirit of the present invention and scope all should be included in the claim.

Claims

1. A liquid crystal panel manufacturing method, the liquid crystal panel comprises an upper substrate and a lower substrate, the method may further comprise the steps:

Coating an initial material of an alignment film on the upper surface of the lower substrate and the lower surface of the upper substrate, the initial material includes polyimide and polyamic acid;

Carrying out a hard-baking step to convert polyamic acid into polyimide, wherein the hard-baking step continues until the polyimide content of the alignment film is 70% to 90% of the fully converted polyimide;

forming a frame glue on the surrounding portion of the upper surface of the lower substrate;

providing at least one liquid crystal droplet on the alignment film surrounded by the sealant; and

The upper substrate and the lower substrate are laminated so that the liquid crystal droplet is encapsulated in the area surrounded by the upper and lower substrates and the sealant.

2 . The method for manufacturing a liquid crystal panel according to claim 1 , wherein the polyimide content of the starting material of the alignment film is 40% to 65% of the fully converted polyimide. 3 .

3 . The method for manufacturing a liquid crystal panel as claimed in claim 1 , further comprising a rubbing orientation step before the step of forming the sealant. 4 .

4. The method for manufacturing a liquid crystal panel as claimed in claim 1, further comprising an angle adjustment step before the step of stacking the upper substrate and the lower substrate.

5. The method for manufacturing a liquid crystal panel as claimed in claim 1, further comprising a detection step after the hard-baking step to determine that the polyimide content of the alignment film is between 70% of the fully converted ~90%.

6. The method for manufacturing a liquid crystal panel as claimed in claim 5, wherein the detecting step utilizes a Fourier infrared spectrometer.

7. The manufacturing method of a liquid crystal panel as claimed in claim 6, wherein the detection step is to compare the alignment film with a reference sample that has been fully transformed.

8 . The method for manufacturing a liquid crystal panel as claimed in claim 7 , wherein the reference sample is formed by hard-baking at 300° C. for about 60 minutes.

9. The method for manufacturing a liquid crystal panel as claimed in claim 6, wherein the detection step is to detect the light absorption ratio of the C-N bond to the benzene ring.

10. The method for manufacturing a liquid crystal panel as claimed in claim 6, wherein the detection step is to detect the light absorption ratio of the C=O bond to the benzene ring.

11. The method for manufacturing a liquid crystal panel as claimed in claim 1, wherein the temperature of the hard baking step is between 180°C and 240°C.

12. The method for manufacturing a liquid crystal panel as claimed in claim 1, wherein the upper substrate and the lower substrate are laminated under a low air concentration.

13. The method for manufacturing a liquid crystal panel as claimed in claim 12, wherein the low air concentration is less than 1Pa.

14. A liquid crystal panel, comprising:

Look at the substrate;

An alignment film is formed on the upper surface of the lower substrate and the lower surface of the upper substrate, wherein the alignment film includes 70% to 90% polyimide;

A frame glue is formed on the peripheral portion of the upper surface of the alignment film;

An upper substrate, bonded to the lower substrate through the sealant; and

A liquid crystal molecule is filled between the upper substrate and the lower substrate.