CN101840108B - Cleaning method of fragments of an alignment film of liquid crystal screen - Google Patents
Cleaning method of fragments of an alignment film of liquid crystal screen Download PDFInfo
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- CN101840108B CN101840108B CN2009100805654A CN200910080565A CN101840108B CN 101840108 B CN101840108 B CN 101840108B CN 2009100805654 A CN2009100805654 A CN 2009100805654A CN 200910080565 A CN200910080565 A CN 200910080565A CN 101840108 B CN101840108 B CN 101840108B
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- electrolyte solution
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Abstract
The invention relates to a cleaning method of fragments of an alignment film of a liquid crystal screen, which comprises the following step: cleaning the surface of a rubbed alignment film by using a cleaning solution, wherein the cleaning solution is a volatile electrolyte solution, and the electrolyte solution is used for removing static electricity on the surface of the alignment film and the fragments of the alignment film. The cleaning method of the fragments of the alignment film of the liquid crystal screen cleans the fragments of the surface of the rubbed alignment film on the substrate by using the volatile electrolyte solution with lower volatilization temperature, and thereby, the cleaning efficiency of the fragments of the alignment film can be effectively improved; after the fragments of the alignment film are cleaned, the residual electrolyte solution on the surface of the alignment film can be completely removed by drying treatment, and therefore, the inside of the liquid crystal screen can not be polluted, which is beneficial to providing guarantee for the quality of the liquid crystal screen.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly relate to a kind of cleaning method of alignment film of liquid crystal screen chip.
Background technology
LCD (Liquid Cristal Display is called for short LCD) is the main product that present graphoscope and high-end TV etc. show the field.In the manufacturing and use of LCD, " the bad point " of liquid crystal display influences the normal demonstration of image, and this is bad to be one of main Quality of puzzlement LCD producer and consumer.The reason that liquid crystal display " bad point " forms has a lot, and wherein most important reason is in the manufacture process of LCD, to have foreign material to get in the liquid crystal display.
In the process that liquid crystal display is made, need to be used for alignment film that liquid crystal is orientated, and most alignment film need rub after the processing of (Rubbing) operation, just can carry out orientation to liquid crystal.Friction process need use a kind of surface to be wrapped with the roller of friction cloth; In the roller high speed rotating; Alignment film to being coated on the substrate (as: array base palte or color membrane substrates) rubs; Wherein, friction cloth is generally processed by fiber, silk or cotton, and alignment film is processed through baking by a kind of organic solution.To being coated in alignment film on the substrate when rubbing, through forming groove, the alignment film molecule is orientated on the alignment film surface, make the alignment film molecule orientation effect arranged to liquid crystal molecule.
After friction cloth friction matching film; Alignment film surface on the substrate after friction can produce chip (comprising alignment film chip and friction measuring fiber chip etc.); These chips need be removed through matting; If the chip on alignment film surface does not clean thoroughly on the substrate, residual chip can become the impurity of introducing in the liquid crystal display manufacture process, promptly is one of reason that forms liquid crystal display " bad point ".In the chip that friction process produces, friction measuring fiber debris volume is big and very little with the adhesion of alignment film, and cleaning is easy to; But the size of alignment film chip is little and and and alignment film between adhesion very strong, make the alignment film chip cleaning comparatively the difficulty.
In the matting of prior art behind friction process, use deionized water or isopropyl alcohol (IPA) solution that the alignment film surface on the substrate is cleaned usually.Because the ion that liquid internals such as deionized water or IPA solution contain is seldom, from composition be organic alignment film surface clean when having the alignment film chip of strong static, efficient is very low.Thoroughly do not cause the liquid crystal display foreign matter bad owing to the alignment film chip cleans, become the multiple problem in the production line.At present a lot of producers make the improvement of the matting after being devoted to rub that ins all sorts of ways, but produce little effect.
Summary of the invention
The cleaning method that the purpose of this invention is to provide a kind of alignment film of liquid crystal screen chip is in order to improve the cleaning efficiency of the alignment film chip on the surface of the alignment film after friction on the liquid crystal display substrate.
For realizing above-mentioned purpose; The invention provides a kind of cleaning method of alignment film of liquid crystal screen chip; It is characterized in that; Comprise: utilize cleaning fluid to clean the alignment film surface after friction, said cleaning fluid is a volatile electrolyte solution, and said electrolyte solution is used to remove the static on said alignment film surface and the alignment film chip.On the basis of technique scheme, volatile electrolyte solution can be carbon acid solution (H
2CO
3), ammonium formate solution (HCOONH
4) or ammonium acetate solution (CH
3COONH
4); The volatilization temperature of volatile electrolyte solution can be less than 250 ℃; The area or the said alignment film quantity of debris on the alignment film that can clean as required surface are confirmed the concentration and/or the consumption of said electrolyte solution; The time of adopting said volatile electrolyte solution to clean said alignment film surface is preferably: 1min～5min.After the alignment film surface clean, can carry out dried to the alignment film surface after cleaning, so that the electrolyte solution volatilization on alignment film surface; The mode of dried can comprise: the said alignment film surface after the heated wash, so that the electrolyte solution volatilization on alignment film surface.
On the basis of technique scheme, the said alignment film surface or the said alignment film after the dried that also can use deionized water or aqueous isopropanol to clean after said volatile electrolyte solution cleans are surperficial; And the alignment film surface after dry said use deionized water or the aqueous isopropanol cleaning.
The cleaning method of alignment film of liquid crystal screen chip of the present invention uses the low volatile electrolyte solution of volatilization temperature, and the chip that the alignment film on the cleaning base plate after friction is surperficial can effectively improve the cleaning efficiency of alignment film chip; After the alignment film chip cleans, adopt methods such as heating, can the remaining electrolyte in alignment film surface be evaporated fully, therefore, can liquid crystal display inside not polluted, help giving security for the quality of liquid crystal display.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is cleaning method embodiment one process flow diagram of alignment film of liquid crystal screen chip of the present invention;
Fig. 2 is cleaning method embodiment two process flow diagrams of alignment film of liquid crystal screen chip of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The cleaning method of alignment film of liquid crystal screen chip of the present invention mainly is to utilize volatile electrolyte solution cleaning fluid to clean the alignment film surface after friction; Removing the static on alignment film surface and the alignment film chip, thereby reach preferably cleaning performance and improved cleaning efficiency.
Fig. 1 is cleaning method embodiment one process flow diagram of alignment film of liquid crystal screen chip of the present invention.As shown in Figure 1, present embodiment comprises;
Alignment film surface on step 11, the use volatile electrolyte solution cleaning base plate after friction.
Alignment film surface on the substrate after step 12, dried are cleaned after friction is so that the electrolyte solution volatilization on alignment film surface.
In the technique scheme step 11, the volatilization temperature of the volatile electrolyte solution of selecting for use is less than 250 ℃; Adopt the time on volatile electrolyte solution cleaning alignment film surface to be preferably: 1min～5min.Available volatile electrolyte solution is like carbon acid solution (H
2CO
3), ammonium formate solution (HCOONH
4) or ammonium acetate solution (CH
3COONH
4) etc.
In the technique scheme step 12, can select the alignment film surface after friction on the substrate after the firing equipment heated wash such as heating plate for use,, make the electrolyte solution volatilization on alignment film surface so that dried is carried out on the alignment film surface after cleaning.Heating plate comprises the steel plate of electrically-heated coil and good heat conductivity.The principle of work that adopts heating plate to carry out heat treated is: steel plate is placed on the electrically-heated coil top; Then substrate is placed on the steel plate upper surface; Heat to steel plate through electrically-heated coil, and make the alignment film surface of the substrate that is placed on the steel plate reach the effect of even heating through heat conduction.Because the heating plate firing equipment needs to use in the process of alignment film baking equally, can shared a kind of equipment.
Liquid crystal display mainly comprises array base palte, color membrane substrates and the liquid crystal layer of between array base palte and color membrane substrates are to box, filling.After the preparation of accomplishing array base palte and color membrane substrates, need on array base palte and color membrane substrates, be formed for liquid crystal is carried out the groove of orientation through friction (Rubbing) operation.Form in the process of groove on the alignment film surface; At first on the viewing area of array base palte or color membrane substrates, apply one deck alignment film; Adopt the surface of high speed rotating to be wrapped with the roller friction matching film surface of friction cloth then; When roller rubs to being coated in alignment film on the substrate, the alignment film molecule is orientated the back forms groove on the alignment film surface.When array base palte and color membrane substrates to the box operation time, between array base palte and color membrane substrates, fill or dispenser method, can be orientated liquid crystal molecule through the alignment film molecule.
In the friction process, after friction cloth friction matching film, the alignment film surface on the substrate after rubbing can produce chip (comprising the alignment film chip and the measuring fiber chip etc. that rubs), and these chips need be removed through matting fully; If the chip on alignment film surface does not clean thoroughly on the substrate, residual chip can become the impurity of introducing in the liquid crystal display manufacture process, promptly is the main cause that forms liquid crystal display " bad point ".Because in the chip that friction process produces, the measuring fiber object is long-pending big and very little with the adhesion of alignment film, cleaning is easy to; But the size of alignment film chip is very little, and in friction process, produces a large amount of static, and alignment film and alignment film chip are of identical composition, and make that the adhesion between alignment film chip and the alignment film is very strong.In a word, owing to the size of alignment film chip little and and and alignment film between reasons such as adhesion is very strong, make the cleaning difficulty comparatively of alignment film chip.
The inventor finds that in realizing process of the present invention in order to make that the alignment film chip is easy to break away from from the alignment film surface, key is to remove the static on alignment film surface and the alignment film chip.Electrolyte can effectively improve the cleaning efficiency to the back alignment film chip that rubs, below can improve the cleaning efficiency of alignment film chip to the electrolyte deionized water commonly used with respect to prior art mechanism describe.
There is static in alignment film surface and the alignment film chip; Therefore; If be used for the ion that the solution of cleaning alignment film chip does not have or seldom be useful on the transmission electric charge; Then be difficult to remove the static that has in alignment film surface and the alignment film chip, therefore be difficult to make the alignment film chip to break away from, can not reach good alignment film chip cleaning performance from the alignment film surface.Because deionized water intermediate ion concentration is very low; Be usually less than the ion concentration in the tap water of common use; Adopt deionized water rinsing alignment film surface, therefore the static angle from remove the alignment film chip is considered, the cleaning performance of deionized water is not even like the cleaning performance of tap water.But the ion that contains in the tap water can't volatilize, and can bring fatal quality problem to LCD.
Electrolyte solution intermediate ion concentration is higher with respect to the deionized water ion concentration.Using electrolyte solution is to transmit electric charge and the static above the chip is eliminated in order to reach through ion, thereby makes the alignment film chip behind the removal static be prone to break away from from the alignment film surface, thereby can reach cleaning performance preferably.Below the mechanism of the ion remaval static that comprises in the electrolyte solution is described: from the principle of static; Static is not to produce new electric charge; But because positive and negative charge has been separated (as: friction process separates positive and negative charge through rubbing action, and on friction tool and rubber, produces static respectively) by certain effect.After positive and negative charge is separated, because alignment film and alignment film chip all are insulators.Suppose: the alignment film surface is positively charged under a certain situation, alignment film detritus zone negative charge; Owing to have certain distance between the positive and negative charge, can't not neutralize fast and effectively under the situation of conductor having.When using electrolyte solution to clean; Electrolyte solution serves as a kind of effect of conductor; A large amount of ions in the electrolyte solution can in the positive charge on alignment film surface and the negative charge on the alignment film chip, and electrolyte solution itself still keeps electric neutrality.Because the static on alignment film surface and the alignment film chip is removed, therefore, the alignment film chip is prone to come off from the alignment film surface, thereby improves the cleaning efficiency of alignment film chip.Further; Because the present invention selects for use volatile electrolyte solution as cleaning fluid; Therefore can thoroughly remove the electrolyte solution of the alignment film remained on surface after the flushing through modes such as heating, thereby avoid exerting an adverse impact owing to alignment film remained on surface ion pair liquid crystal display quality.
The degree of ionization of electrolyte solution is characterizing ion or the charge number that solution can provide, so the use amount of electrolyte solution, degree of ionization are corresponding with the alignment film quantity of debris that needs clean.Select suitable electrolyte solution according to actual alignment film material of selecting for use and concrete process conditions, can carry out integration test, seek suitable parameters electrolytical concentration, electrolytical consumption and the alignment film quantity of debris that needs to clean.Because the debris quantities that different friction conditions produces down is different with amount of charge; Therefore when the alignment film chip on alignment film surface cleans on to substrate, need test in advance with parameters such as the concentration of obtaining best electrolyte solution as cleaning fluid, consumptions.The concrete grammar of confirming as parameters such as the concentration of the electrolyte solution of cleaning fluid, consumptions can comprise:
With many substrates after the mantle friction of same friction condition making alignment film; The cleaning fluid of preparation variable concentrations; Carry out the cleaning test on alignment film surface on the substrate with different use amounts; Concentration and use amount method from low to high by the electrolyte solution of selecting for use are tested, to obtain the optimal parameter of electrolyte solution.Generally speaking, if adopt the electrolyte solution or the less electrolyte solution of use amount of low concentration, can not reach good cleaning performance, the use amount that can suitably improve the concentration of electrolyte solution or improve electrolyte solution is to reach cleaning performance preferably; When the concentration of electrolyte solution improves or after use amount is increased to a certain degree; If the concentration of the electrolyte solution that adopts continues to improve when perhaps the use amount of electrolyte solution continues to increase; When the cleaning performance of the alignment film chip on alignment film surface does not have further the improvement on the substrate; This concentration of electrolyte solution and use amount are most economical concentration and use amount so, adopt definite concentration or use amount as the preferred parameter of preferred electrolyte solution, can reach cleaning performance preferably.
The cleaning method of alignment film chip of the present invention can be selected the good electrolyte solution of volatility for use.This is because liquid crystal display is very responsive for the ion that inside exists; After alignment film is cleaned completion; Usually need carry out array base palte and color membrane substrates to box operation and liquid crystal injection process; If the ion that in the alignment film cleaning process, produces can not be removed, will have a strong impact on the quality of liquid crystal display.Include ion in the electrolyte solution, therefore after the alignment film chip cleans completion, need remove the electrolyte solution of substrate remnants on the alignment film surface after the friction fully, in order to avoid the ion in the remaining electrolyte solution influences the quality of liquid crystal display.Remove electrolyte solution remaining on the alignment film surface for ease and thoroughly; Can in alignment film chip cleaning process, select volatile electrolyte solution for use; And make remaining electrolyte solution volatilization on the alignment film surface through methods such as heating alignment film surfaces, thoroughly remove the purpose of electrolyte solution remaining on the alignment film surface from reaching.
Solution such as common a lot of organic salts, organic acid all have volatile electrolyte; For avoiding in the electrolyte solution heating process that makes the alignment film surface, alignment film being caused damage; The present invention need select the lower electrolyte solution of volatilization temperature for use; Preferably, the volatilization temperature of electrolyte solution is lower than 250 ℃.The available electrolyte solution of the present invention is for example: carbon acid solution, ammonium formate solution, ammonium acetate solution etc.Owing to produce toxic gas in the electrolyte solution volatilization process needs are improved (as: requiring external unit to have sealing avoids toxic gas to leak) to external unit for avoiding accordingly, can select carbon acid solution for use.
Select for use the alignment film surface on carbon acid solution array substrate or the color membrane substrates to carry out in the cleaning process, also can not corrode other rete on array base palte or the color membrane substrates.This is that alignment film forms protective effect to the rete of its below owing to most zones on array base palte that needs the formation groove or the color membrane substrates are coated with alignment film.The fraction zone that on substrate, does not have alignment film is dielectric film (as: silicon nitride) or ITO (tin indium oxide) film; These two kinds of films all possess certain corrosion resistance; Carbon acid solution only after acting on for a long time, could form certain corrosivity to these two kinds of films.Using carbon acid solution to clean, (1min～5min), therefore, the corrosive attack that other rete of carbon acid solution array substrate or color membrane substrates causes can be ignored because scavenging period is short.
The cleaning method of alignment film of liquid crystal screen chip of the present invention uses the low volatile electrolyte solution of volatilization temperature, and the chip that the alignment film on the cleaning base plate after friction is surperficial can effectively improve the cleaning efficiency of alignment film chip; After the alignment film chip cleans, adopt methods such as heating, can the remaining electrolyte in alignment film surface be evaporated fully, therefore, can liquid crystal display inside not polluted, help giving security for the quality of liquid crystal display.
Fig. 2 is cleaning method embodiment two process flow diagrams of alignment film of liquid crystal screen chip of the present invention.As shown in Figure 2, present embodiment comprises:
Step 21, use volatilization temperature less than 250 ℃ volatile electrolyte solution, the surperficial 1min～5min of the alignment film on the cleaning base plate after friction.
Step 22, the alignment film surface of using washed with de-ionized water step 21 to handle.
Alignment film surface after step 23, drying steps 22 are handled, for example available air-flow dries up the deionized water on alignment film surface.
Alignment film surface after step 24, heating steps 23 are handled is so that the electrolyte solution volatilization on alignment film surface.
Step 25, the alignment film surface of using washed with de-ionized water step 24 to handle.
Alignment film surface after step 26, drying steps 25 are handled, for example available air-flow dries up the deionized water on alignment film surface.
In step 22 or the step 25, except using deionized water rinsing alignment film surface, also can select for use other neutral solution (as: IPA solution, alcohol etc.) that the alignment film surface is cleaned in the technique scheme.
It will be understood by those skilled in the art that the alignment film surface after technique scheme also can be according to actual needs only handled back or step 24 and handled step 21 carry out the further cleaning and the dried of neutral solution.
Present embodiment washes in the alignment film surface process in neutral solutions such as adopting deionized water; Can the friction measuring fiber chip that produce in the friction process process be removed; Simultaneously; Also can most electrolyte solutions remaining on the alignment film surface be taken away, help shortening the follow-up time that makes the electrolyte solution volatilization handle required use.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging embodiment of the invention technical scheme of relevant art scheme.
Claims (7)
1. the cleaning method of an alignment film of liquid crystal screen chip; It is characterized in that; Comprise and utilize cleaning fluid to clean the alignment film surface after friction, said cleaning fluid is a volatile electrolyte solution, and said electrolyte solution is used to remove the static on said alignment film surface and the alignment film chip; Alignment film surface after dried is cleaned is so that the electrolyte solution volatilization on alignment film surface.
2. the cleaning method of alignment film of liquid crystal screen chip according to claim 1 is characterized in that, said volatile electrolyte solution is carbon acid solution, ammonium formate solution or ammonium acetate solution.
3. the cleaning method of alignment film of liquid crystal screen chip according to claim 1 is characterized in that, the volatilization temperature of said volatile electrolyte solution is less than 250 ℃.
4. the cleaning method of alignment film of liquid crystal screen chip according to claim 1 is characterized in that, the time of adopting said volatile electrolyte solution to clean said alignment film surface is: 1min～5min.
5. the cleaning method of alignment film of liquid crystal screen chip according to claim 1 is characterized in that, the alignment film surface after said dried is cleaned comprises: the said alignment film surface after the heated wash, so that the electrolyte solution volatilization on alignment film surface.
6. according to the cleaning method of the described alignment film of liquid crystal screen chip of the arbitrary claim of claim 1～4, it is characterized in that, also comprise:
The said alignment film surface or the said alignment film after the dried that use deionized water or aqueous isopropanol to clean after said volatile electrolyte solution cleans are surperficial;
Alignment film surface after dry said use deionized water or aqueous isopropanol clean.
7. the cleaning method of alignment film of liquid crystal screen chip according to claim 1; It is characterized in that; Utilize said volatile electrolyte solution to clean said alignment film surface; Comprise: the area or the said alignment film quantity of debris on the alignment film surface of cleaning as required, confirm the concentration and/or the consumption of said electrolyte solution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100805654A CN101840108B (en) | 2009-03-20 | 2009-03-20 | Cleaning method of fragments of an alignment film of liquid crystal screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100805654A CN101840108B (en) | 2009-03-20 | 2009-03-20 | Cleaning method of fragments of an alignment film of liquid crystal screen |
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| CN101840108A CN101840108A (en) | 2010-09-22 |
| CN101840108B true CN101840108B (en) | 2012-02-29 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570496B (en) * | 2015-02-04 | 2017-05-10 | 京东方科技集团股份有限公司 | Method for cleaning substrate formed with oriented film |
| CN105204233B (en) * | 2015-10-26 | 2019-03-15 | 京东方科技集团股份有限公司 | Display base plate friction orientation method and device, display base plate preparation method and system |
| CN106226945A (en) * | 2016-07-29 | 2016-12-14 | 信利（惠州）智能显示有限公司 | Colored filter and preparation method thereof, display module and display device |
| CN106646968B (en) * | 2016-11-15 | 2020-05-08 | 上海中航光电子有限公司 | Display substrate, manufacturing method, liquid crystal display panel and liquid crystal display device |
| CN107884962A (en) * | 2017-09-30 | 2018-04-06 | 江西合力泰科技有限公司 | A kind of manufacture craft of electronic price computing board display screen |
| JP6709314B2 (en) * | 2018-06-13 | 2020-06-10 | シャープ株式会社 | Liquid crystal substrate manufacturing method and liquid crystal substrate processing apparatus |
| CN110068962A (en) * | 2019-06-17 | 2019-07-30 | 京东方科技集团股份有限公司 | Display base plate and its friction orientation method, preparation method |
| CN110687703B (en) * | 2019-10-16 | 2022-05-31 | 深圳市华星光电半导体显示技术有限公司 | Repairing device and method for liquid crystal alignment film |
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