CN101169563A - Production process control method for reducing liquid crystal bubble generation in LCD production - Google Patents
Production process control method for reducing liquid crystal bubble generation in LCD production Download PDFInfo
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Abstract
The invention discloses a control method for the technical processing which can reduce the liquid crystal bubbles during producing liquid crystal displays. The invention has the key point of the method that: through improving the aspects such as silk screen, powder injection, and planing posts, namely, the aspects of the material mixing of pads and frame pads, the type and density of pads, the unfolding width of frame rubber, and the planing pressure of a sealing opening, the invention reduces the occurrence of liquid crystal bubbles to the minimum during every producing step, thereby significantly reducing the defective occurrence of the liquid crystal bubbles in liquid crystal products, and as well as improving the uniformity of the thickness of an LCD box. The control method of the invention can improve the yield and the quality stability of LCD products.
Description
[technical field]
The present invention relates to STN, C-STN process for manufacturing liquid crystal display.
[background technology]
Liquid crystal bubbles is the critical defect of LCD, belong to stealthy bad, as the collocation of irrational liner of LCD (spacer) and frame gasket material, liner kind and density select improper, that frame glue broadening is less than normal, frame glue (seal) is selected is improper, becomes box hot pressing (temperature/time/pressure) condition improper, seal that leveling pressure is bigger than normal, filling liquid crystal condition, secondary cleaning ultrasonic power and glass FPC overlay aspects such as the post vacuum adsorption force is excessive all can directly influence, and produce bad.
Knock detection (condition: diameter of the steel ball=10mm, weight=5.5g through steel ball; Knock height: T≤7mm, H=10cm; T＞7mm, H=12cm; Beating point: four jiaos and center be totally 5 points; Steel ball knocks, inspection after 3 hours) reason of generation liquid crystal bubbles: LCD unit (cell) is subjected to external impacts, glass surface generation deformation (cell gap), liner bounce-back, produce vacuum in this position, the micro-air that is dissolved with in the liquid crystal is slowly separated out the formation liquid crystal bubbles to this vacuum place.
Cryogenic freezing detects (condition: temperature :-40 ℃; Preserved 24 hours) produce the reason of liquid crystal bubbles: at low temperatures, liner can not cause the trickle retraction volume of liquid crystal to change by adaptive temperature, changes the equilibrium system of liquid crystal molecule, and not deformation of glass itself.Vacuum degree deficiency during simultaneously as the filling liquid crystal, then gas molecule will overflow from the liquid crystal molecule system and accumulate in together, all can form liquid crystal bubbles, also is stain, has more middle part, present viewing area, as shown in Figure 2.
Cryopreservation+steel ball knock detection (condition :-40 ℃, preserved 4 hours, take out that steel ball knocks diameter of the steel ball=10mm, weight=5.5g in 5 minutes; Knock height: T≤7mm, H=10cm; T＞7mm, H=12cm; Beating point: four jiaos and center be totally 5 points; Steel ball knocks, and checks after 3 hours) produce the reason of liquid crystal bubbles comprehensive the above.
Thermal shock detects (condition :-20 ℃ of (60min) ← (5min) → 60 ℃ (60min), 10cy) produce the reason that enlarges liquid crystal bubbles: liner can not adapt to impact and cause trickle retraction volume to change, inside is contained a spot of steam and is dissolved in liquid crystal, or it is owe to irritate not complete obiteration, or very slight and promptly reproduce after dashing through high low temperature.
In addition, liquid crystal bubbles also usually can appear at LCD frame glue (seal) edge, is because liner bounce-back, due to frame glue built on the sand or the LCD sylphon vacuumizes not exclusively, as shown in Figure 3.
The liquid crystal bubbles product as through deaeration (condition: 50 ℃, 25min, 0.5Mpa) and aging (condition: 110 ℃, 60min) back disappears, and it belongs to vacuum liquid crystal bubbles, owes to irritate bad as not disappearing then to belong to.
[summary of the invention]
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of manufacturing process control method that reduces fraction defective, improves the LCD product quality is provided, and is applied in the production run of LCD product.
For achieving the above object, the present invention proposes a kind of LCD and reduces the product manufacturing process control method that liquid crystal bubbles takes place in producing, and opposite liner and frame gasket material, frame glue broadening, seals leveling pressure and is optimized selection: select recovery rate less than 95%, hardness is greater than 40 gasket material; Frame glue broadening is 1.7～2.5 times; Seal the leveling pressure control in 0.45kgf/cm
2Below.
Above-mentioned product manufacturing process control method, the face liner of STN-LCD select density to be: 100～140pcs/mm
2Material, the face liner of CSTN-LCD selects density to be: 160～180pcs/mm
2Material.The face liner of STN-LCD and frame gasket material are chosen as particle diameter and differ more than 0.2 micron.The face wadding of STN-LCD is chosen as: L-11NR series, KBS etc., and the frame liner is chosen as: the PF glass fiber; The face liner of CSTN-LCD is chosen as: KBS/KBS-RX/KBS-RS series, L-S-DE series, the frame wadding is chosen as: the SI glass bead.In the secondary cleaning operation, the ultrasound wave Control current is 2.0～3.0A.The width of frame glue is set according to the size of the size of glass, non-visible area, and frame glue is positioned at outside the visible area after expanding, and covers ITO after frame glue expands.When glass FPC overlays, can hold under the prerequisite of LCD screen, during absorption LCD screen below vacuum degree control-80Mpa.
Above-mentioned product manufacturing process control method is face liner (a CV value 5%) for the ratio of the basic particle diameter of STN-LCD: frame liner: gold goal=1: 1.05: 1.1～1.15; The ratio of the basic particle diameter of CSTN is face liner (a CV value 3%): the frame liner: gold goal=frame liner particle diameter/1.05-X/2: the target box is thick+and X+0.1～0.3: frame liner particle diameter * (1.1～1.15/1.05).The width of frame glue is more than the 0.25mm, and the expansion multiplying power of frame glue calculates by 210%.
Above-mentioned product manufacturing process control method add liquid crystal in the liquid crystal boat before, is completely fixed the liquid crystal boat; In the liquid crystal boat, add liquid crystal for the first time to concordant with groove face; In irritating the liquid process, the glass frock is fixed, and first frame seals as far as possible the center at groove in the time of must contraposition.In irritating the liquid process, of short duration when bubble occurring towards nitrogen, continue then to vacuumize, repeated multiple times is till no bubble; The conical flask that to adorn the test passes liquid crystal in the deaeration process is put into simultaneously and is irritated the liquid crystal machine and carry out deaeration and handle.Filling liquid crystal room is kept humidity and is maintained at 50 ± 5%RH, and temperature maintenance is in 23 ± 2 ℃.During hot-press solidifying, the temperature maintenance stable and uniform, the actual temperature test request of glass surface is 150～180 ℃, the time kept 90 minutes at least.
The present invention adopts the effective manufacturing process control method of system, emphasis by to silk-screen, dust, flatten the post, be the collocation of face liner and frame gasket material, liner kind and density, frame glue broadening, seal aspect optimization improvement such as flattening pressure, simultaneously operations such as hot pressing, filling liquid, secondary cleaning, FPC overlay have also been done optimal control.In each production link, reduce the probability that liquid crystal bubbles takes place as far as possible, significantly reduce the bad incidence of LCD product liquid crystal bubbles, can improve the thick homogeneity of LCD box simultaneously.Make and use control method of the present invention, the yields of LCD is improved, the constant product quality raising.
[description of drawings]
Fig. 1 is the border structure synoptic diagram of LCD;
Fig. 2 is a liquid crystal bubbles synoptic diagram in the LCD unit;
Fig. 3 is a LCD frame glue edge liquid crystal bubbles synoptic diagram.
Fig. 4 is the thick exemplary plot of box.
Fig. 5 is a HC-1210 frame adhesiveness variation diagram.
Fig. 6 is the bubble incidence and seals pressure variation relation figure.
Fig. 7 is a HC-1210 frame glue hot-press solidifying thetagram.
Fig. 8 is the complete flow sheet of LCD.
[embodiment]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Please refer to shown in Figure 8, whole production flow process for LCD production, present embodiment with silk-screen, dust, leveling etc. attaches most importance to and optimizes the operation of improving, i.e. face liner and frame gasket material collocation, liner kind and density, frame glue broadening, seal leveling pressure etc. and be optimized control; Operations such as hot pressing, filling liquid, secondary cleaning, FPC overlay have also been done optimal control.
As shown in Figure 1, the common structure of the liquid crystal cells of LCD comprises: ito glass 1, face wadding (L-11NR or KBS etc.) 2, gold goal (AU ball etc.) 5, frame wadding (PF glass fiber or SI ball) 4, frame glue 6, colored filter (CF) glass 3.
Wadding particle diameter method for selecting: decision target box is thick, selected frame liner particle diameter, and decision face liner and gold goal particle diameter carry out process optimization.
Ratio for the basic particle diameter of STN-LCD is: L-11NR etc. (CV value 5%): PF: AU=1: 1.05: 1.1～1.15.CV value representation particle size uniformity precision.
If the CV of liner is under the situation below 5%, the particle diameter ratio that needs is above-mentioned bigger; Under the situation of chromatic colour optical filter (CF) (CSTN-LCD product), must carry out following correction to the result that said method obtains:
Usually the thickness X of colored filter is 1～2um, but because softer, need consider the situation that the particle pressurized is recessed.Recessed situation it is generally acknowledged that with the material of colored filter and the different difference that have of pressure thick influence is that the thick value of former box own is made an appointment with half to actual box.
The ratio of the basic particle diameter of CSTN-LCD is:
KBS etc. (CV value 3%): SI: AU=SI/1.05-X/2: the target box is thick+X+0.1～0.3: SI* (1.1～1.15/1.05).As the thick homogeneity exemplary plot 4 of box.
General selection liner is L-11NR series (STN), L-S-DE series, KBS/KBS-RX/KBS-RS series (CSTN); Liner density is generally 100～140pcs/mm according to the material different choice
2(STN), 160～200pcs/mm
2(CSTN).
Gasket material fundamental characteristics contrast table
| Gasket material | Recovery rate % | Hardness H | Precision Cv |
| L-11NR series | 83％ | 65 | Below 5% |
| SP series | 92％ | 46 | Below 5% |
| L-S-DE series | 88％ | 69 | Below 3% |
| KBS/KBS-RX/KBS-RS series | 93％ | 59 | Below 3% |
Frame glue principle of design: the width of frame glue is according to the size of glass, and the size of non-visible area is come fixed, generally is designed to more than the 0.25mm, and the expansion multiplying power of frame glue calculates by 210%, and frame glue can not enter visible area after expanding, and frame glue will cover ITO after expanding.
As the most of CSTN use HC-1210 of company frame glue.HC-1210 frame adhesiveness variation diagram please refer to Fig. 4, HC-1210 frame glue characteristic such as following table:
Seal leveling pressure control 0.45kgf/cm
2Below.Please refer to shown in Figure 6, when seal the leveling pressure greater than 0.45kgf/cm
2More than, the easier generation liquid crystal bubbles of the compressed bounce-back of wadding.
Please refer to HC-1210 frame glue hot-press solidifying thetagram shown in Figure 7.Temperature maintenance stability and homogeneity in the hot-press solidifying stove, the actual temperature test request of glass surface: 150～180 ℃, the time is 90min at least.
It is 50 ± 5%RH that humidity is kept in filling liquid crystal room, and temperature is 23 ± 2 ℃, selects suction and time according to Different L CD unit.Can be after filling and liquid crystal bubbles complete obiteration are owed in filling liquid room to sealing the post.
Before in the liquid crystal boat, adding liquid crystal, the liquid crystal boat must be completely fixed, as long as the overfill that can not add when adding liquid crystal for the first time in the liquid crystal boat is concordant with groove face; In irritating the liquid process, the glass frock must be fixed.First frame seals the center (vacuumizing complete) at groove in the time of must contraposition.Irritate liquid condition correlation parameter following (for reference):
In irritating the liquid process, when finding bubble is arranged, need be of short duration towards nitrogen, continue then to vacuumize, repeated multiple times (is used the qi of chong channel ascending adversely valve) during deaeration till no bubble.The conical flask that to adorn the test passes liquid crystal in the deaeration process is also put into simultaneously and is irritated the liquid crystal machine and carry out deaeration and handle.
Automatic deaeration condition (for reference, as in the actual job process,, but to need thorough the removing till the liquid crystal bubble) with different model and the change to some extent of different liquid crystal series:
| Initial deaeration vacuum tightness | Deaeration T.T. | The deaeration gap | Remarks |
| 1000pa | 100S±50S | 10S±5S | Adopt big flow during deaeration |
The secondary cleaning ultrasonic power is excessive, and (electric current: 4A), the LCD unit is in easy non-steady state, and liner deformation produces liquid crystal bubbles, secondary cleaning ultrasound wave Control current: 2.0～3.0A.
Vacuum degree control-80Mpa following (under the prerequisite that can hold the LCD screen) when FPC overlays post suction LCD screen.
In sum, present embodiment adopts the effective manufacturing process management-control method of a kind of system, can significantly reduce the bad incidence of LCD product liquid crystal bubbles.The main emphasis of the present invention by to silk-screen, dust, flatten the post, be the collocation of face liner and frame gasket material, face liner kind and density, frame glue broadening, seal aspect optimization improvement such as flattening pressure, improve the reliability of LCD screen, thereby it is bad to reduce LCD product liquid crystal bubbles, can improve the thick homogeneity of LCD box etc. simultaneously.
Claims (13)
1. reduce the product manufacturing process control method that liquid crystal bubbles takes place during a LCD produces, it is characterized in that, to gasket material selections, frame glue broadening, seal leveling pressure and be optimized selection: the selection recovery rate less than 95%, hardness is greater than 40 gasket material; Frame glue broadening is 1.7～2.5 times; Seal the leveling pressure control in 0.45kgf/cm
2Below.
2. product manufacturing process control method as claimed in claim 1 is characterized in that, the liner of STN-LCD selects density to be: 100～140pcs/mm
2Material, the liner of CSTN-LCD selects density to be: 160～200pcs/mm
2Material.
3. product manufacturing process control method as claimed in claim 1 is characterized in that: the face liner of STN-LCD and frame gasket material are chosen as particle diameter and differ more than 0.2 micron.
4. product manufacturing process control method as claimed in claim 1 is characterized in that, the face wadding of STN-LCD is chosen as: L-11NR series, KBS, and the frame liner is chosen as: the PF glass fiber; The face liner of CSTN-LCD is chosen as: KBS/KBS-RX/KBS-RS series, L-S-DE series, the frame wadding is chosen as: the SI glass bead.
5. product manufacturing process control method as claimed in claim 1 is characterized in that: in the secondary cleaning operation, the ultrasound wave Control current is 2.0～3.0A.
6. product manufacturing process control method as claimed in claim 1 is characterized in that: the width of frame glue is set according to the size of the size of glass, non-visible area, and frame glue is positioned at outside the visible area after expanding, and covers ITO after frame glue expands.
7. product manufacturing process control method as claimed in claim 1 is characterized in that: when glass FPC overlays, can hold under the prerequisite of LCD screen, during absorption LCD screen below vacuum degree control-80Mpa.
8. product manufacturing process control method as claimed in claim 1 is characterized in that: the ratio for the basic particle diameter of STN-LCD is face liner (a CV value 5%): frame liner: gold goal=1: 1.05: 1.1～1.15; The ratio of the basic particle diameter of CSTN is face liner (a CV value 3%): the frame liner: gold goal=frame liner particle diameter/1.05-X/2: the target box is thick+and X+0.1～0.3: frame liner particle diameter * (1.1～1.15/1.05).
9. product manufacturing process control method as claimed in claim 6 is characterized in that: the width of frame glue is more than the 0.25mm, and the expansion multiplying power of frame glue calculates by 210%.
10. as each described product manufacturing process control method among the claim 1-9, it is characterized in that: before in the liquid crystal boat, adding liquid crystal, the liquid crystal boat is completely fixed; In the liquid crystal boat, add liquid crystal for the first time to concordant with groove face; In irritating the liquid process, the glass frock is fixed, and first frame seals as far as possible the center at groove in the time of must contraposition.
11., it is characterized in that as each described product manufacturing process control method among the claim 1-9: of short duration when bubble occurring in irritating the liquid process towards nitrogen, continue then to vacuumize, repeated multiple times is till no bubble; The conical flask that to adorn the test passes liquid crystal in the deaeration process is put into simultaneously and is irritated the liquid crystal machine and carry out deaeration and handle.
12. as each described product manufacturing process control method among the claim 1-9, it is characterized in that: irritate liquid crystal room humidity and be maintained at 50 ± 5%RH, temperature maintenance is in 23 ± 2 ℃.
13., it is characterized in that as each described product manufacturing process control method among the claim 1-9: during hot-press solidifying, the temperature maintenance stable and uniform, the actual temperature test request of glass surface is 150～180 ℃, the time kept 90 minutes at least.
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| CN101571651B (en) * | 2009-06-01 | 2011-09-07 | 深圳晶华显示器材有限公司 | Method for eliminating liquid crystal bubbles from LCD |
| CN101710218B (en) * | 2009-03-13 | 2011-11-30 | 深超光电（深圳）有限公司 | Display panel for preventing vacuum envelopes from accumulating in corner area |
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| CN101571651B (en) * | 2009-06-01 | 2011-09-07 | 深圳晶华显示器材有限公司 | Method for eliminating liquid crystal bubbles from LCD |
| CN103395974B (en) * | 2013-08-09 | 2015-11-04 | 句容骏成电子有限公司 | A kind of glass frame and preparation method thereof and utilize the hot-press method of glass frame |
| CN103395974A (en) * | 2013-08-09 | 2013-11-20 | 句容骏成电子有限公司 | Glass frame, making method thereof, and hot pressing method utilizing glass frame |
| CN103400804A (en) * | 2013-08-12 | 2013-11-20 | 句容骏成电子有限公司 | COG product preparation method |
| CN103400804B (en) * | 2013-08-12 | 2015-11-18 | 句容骏成电子有限公司 | A kind of preparation method of COG product |
| CN104570499A (en) * | 2014-12-30 | 2015-04-29 | 深圳市华星光电技术有限公司 | Liquid crystal panel and manufacturing method thereof and liquid crystal display device |
| CN104570501A (en) * | 2014-12-30 | 2015-04-29 | 深圳市华星光电技术有限公司 | Liquid crystal panel and manufacturing method thereof and liquid crystal display device |
| WO2016106848A1 (en) * | 2014-12-30 | 2016-07-07 | 深圳市华星光电技术有限公司 | Liquid crystal panel, manufacturing method thereof, and liquid crystal display apparatus |
| CN104570499B (en) * | 2014-12-30 | 2018-01-09 | 深圳市华星光电技术有限公司 | Liquid crystal panel and its manufacture method and liquid crystal display device |
| CN104570501B (en) * | 2014-12-30 | 2018-01-09 | 深圳市华星光电技术有限公司 | Liquid crystal panel and its manufacture method and liquid crystal display device |
| CN108363223A (en) * | 2018-01-19 | 2018-08-03 | 精电(河源)显示技术有限公司 | A kind of liquid crystal display production method for reducing bubble and generating |
| CN109164621A (en) * | 2018-09-12 | 2019-01-08 | 东莞通华液晶有限公司 | A kind of high-flatness liquid crystal display structure production method |
| CN111290180A (en) * | 2020-02-27 | 2020-06-16 | 亚世光电股份有限公司 | Technological method for producing large-size LCD (liquid Crystal display) in perfusion mode |
| CN111290180B (en) * | 2020-02-27 | 2022-10-11 | 亚世光电股份有限公司 | Technological method for producing large-size LCD in perfusion mode |
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