CN201314989Y - Ultrathin flexible LCD - Google Patents

Abstract

The utility model provides an ultrathin flexible LCD, which comprises a first baseplate and a second baseplate oppositely arranged to each other and a liquid crystal layer arranged between the first baseplate and the second baseplate; the first baseplate and the second baseplate are manufactured by PET conducting films, and are stuck together by epoxide resin bonding cement; a needed first electrode and a needed second electrode are curved on the opposite surfaces of the first baseplate and the second baseplate; the first electrode and the second electrode are coated with oriented films; moreover, a separating ball used for controlling the space between the two baseplates is arranged between the first baseplate and the second baseplate. The LCD has the advantages of thin thinness, flexibility, pressure resistance, not easy breaking, and vibration resistance, etc.

Description

Ultrathin flexible liquid crystal display

Technical field

The utility model relates to a kind of ultrathin flexible liquid crystal display (LCD).

Background technology

Along with the development of technology, liquid crystal display device is widely used in the vast field from the small information terminal to the large-scale projector equipment of porjection type.LCD generally includes separately to be had a pair of substrate of electrode on the surface within it and places dielectric anisotropic liquid crystals layer between the described substrate.As everyone knows, existing common liquid crystals display uses glass as baseplate material, but mainly there is following shortcoming in this display: display sizes is thicker; Glass breadks easily, thus give transportation and use and all brought a lot of inconvenience, for example, not withstand voltage, shock resistance is poor; In addition, because glass is rigidity, so LCD also is rigid plane usually, this has just limited its application, for example can not be made into different shape, can not be crooked, or the like.

For example, existing LCD all is by 0.4mm, 0.55mm, and 0.7mm, the glass of 1.1mm equal thickness is done baseplate material, so the display of producing is thicker, general thickness can not be lower than 1.2mm.This make frangible with glass as the LCD of substrate, can not be crooked, can not make different shape.

In recent years, having proposed substrate is by flexible board, for example the LCD that makes of plastic sheeting.This LCD is in light weight, thin thickness, excellent impact resistance, and such liquid crystal indicator can be installed on nonplanar surface.

Summary of the invention

Therefore, the purpose of this utility model provides a kind of new type superthin flexible liquid crystal display.

According to one side of the present utility model, a kind of ultrathin flexible liquid crystal display is provided, described flexible liquid crystal display comprises:

The 1st substrate positioned opposite to each other and the 2nd substrate, described the 1st substrate and the 2nd substrate are made by the PET conducting film, and described the 1st substrate and the 2nd substrate lump together by the epoxy bond sticker;

Be arranged on the liquid crystal layer between the 1st substrate and the 2nd substrate;

On the apparent surface of described the 1st substrate and the 2nd substrate, be carved with the 1st required electrode and the 2nd electrode;

Be coated with oriented film on described the 1st electrode and the 2nd electrode;

Between described the 1st substrate and the 2nd substrate, also evenly be provided with the separating ball that is used to control the interval between two substrates.

Wherein, the described the 1st and the thickness of the 2nd substrate be 0.045～0.188 millimeter.

Wherein, described the 1st electrode and the 2nd electrode be by the 1st substrate and the 2nd substrate are carried out resist coating, exposure, development, harsh, demoulding is made.

Wherein, described oriented film is applied by polyester imines and makes, and is 400～800 dusts with its THICKNESS CONTROL.

Wherein, described oriented film is by being heating and curing and respectively described oriented film being rubbed to obtain required liquid crystal aligning direction with flannelette.

Wherein, described the 1st electrode and/or the 2nd electrode are provided with firing point, and described firing point forms by the silk-screen conductive gold spacer.

Wherein, described separating ball evenly was sprayed on the described the 1st and/or the 2nd electrode before fitting.

Major advantage of the present utility model is: (1) ultra-thin (2) lighter (3) shockproof good (4) are withstand voltage, and non-friable (5) flexible (6) can be made into different shape.Thickness according to LCD of the present utility model (LCD) can reach 0.4～0.7 millimeter, and this compares with the glass mould LCD of prior art, and thickness has remarkable reduction.

Description of drawings

Above-mentioned and/or other purpose of the present utility model and advantage will become apparent by following detailed description of preferred embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the diagrammatic cross-section according to ultrathin flexible liquid crystal display spare of the present utility model.

Embodiment

Below in conjunction with specific embodiment the utility model is described further, but should be noted that embodiment of the present utility model only is used to illustrate the technical solution of the utility model, and non-limiting the utility model.

At first, with reference to the concrete structure of Fig. 1 explanation according to ultrathin flexible liquid crystal display of the present utility model (LCD).

As shown in Figure 1, mainly comprise the 1st polaroid the 1, the 1st substrate (1PET conducting film) the 2, the 1st electrode 3, oriented layer 4, liquid crystal layer the 5, the 2nd polaroid the 6, the 2nd substrate (2PET conducting film) the 7, the 2nd electrode 8, orientedlayer 9, sealing-inlimit 10 etc. according to ultrathin flexible LCD of the present utility model.Each of described LCD layer structure is arranged in order from bottom to up according to aforementioned order, and wherein liquid crystal layer is sandwiched between two substrate layers.To below about the explanation of each several part structure, the embodiment of bonding manufacturing method makes further explanation.

According to the utility model, adopt high molecule plastic, for example, PET (polyphenyl dioctyl phthalate glycol ester) conducting film replaces glass as substrate.The benefit of doing like this be can make that LCD weight lightens, thickness attenuation and excellent impact resistance.

Preferably, can reach 0.4～0.7 millimeter according to LCD thickness of the present utility model, this compares with the glass mould LCD of prior art, and thickness has remarkable reduction.

In addition, ultrathin flexible liquid crystal indicator of the present utility model can be installed on nonplanar surface.

In addition, all be known in the prior art about the structure of LCD, no longer it is further described at this.

To further describe method below according to manufacturing ultrathin flexible liquid crystal display of the present utility model.

In this explanation, make the method for flexible base, board before with highlighting the perfusion liquid crystal, its ultimate principle is as follows:

At first, on the PET nesa coating, carve required electrode pattern, respectively upper/lower electrode is coated oriented film, and it is heating and curing, respectively the oriented film of upper/lower electrode is rubbed to obtain required liquid crystal aligning direction with flannelette.

Then, on top electrode, stamp epoxy bond glue, on bottom electrode, stamp firing point (for example, conductive gold spacer), and on bottom electrode, evenly spray separating ball, upper/lower electrode is fit together, and make the epoxy resin adhesive curing at the pressurized, heated state.So just formed the flexible base, board of fitting.

More particularly, the method according to manufacturing ultrathin flexible liquid crystal display of the present utility model mainly may further comprise the steps:

(1) PET cuts, and according to the needs of producing, the size with the PET film slitting becomes to stipulate for example becomes the PET film slitting 14 * 16 inches size.This step is used to cut the 1st and the 2nd substrate.Thickness for the PET conducting film is not done special requirement, produces needs as long as it can satisfy, and for example can select thickness for use is 0.045～0.188 millimeter PET film.

(2) PET preliminary drying is placed on the 1st and the 2nd substrate (being the PET sheet material) that cuts in 130～160 ℃ the temperature and dried 2～3 hours.

(3) PET attach to clean, because PET is very thin very soft, not easy to operate, so for example PET will be attached to 14 * 16 inches on glass, with handled easily, attach and uses double faced adhesive tape.PET sheet material after will drying after the attaching is placed in the KOH solution of 0.5～1.0wt.% and washed 5～10 minutes.

(4) PET gluing, gluing on the 1st after cleaning and 2PET sheet material, for example use roller glue spreader resist coating equably on the PET conducting film according to electrode pattern, THICKNESS CONTROL is dried glue under 80～150 ℃ temperature between 1.0～1.5 microns (μ m) then.

(5) exposure exposes the PET film that has been coated with photoresist with ultraviolet light, and the time shutter is 10～20 seconds.

(6) develop, the PET sheet material after the exposure is placed on soak in the KOH solution of 0.5～0.8wt.% and developed in 80～150 seconds.

(7) harsh, the workpiece after developing is placed in the HCL solution of 0.5～0.8wt.% harsh 80～150 seconds.

(8) exposure, carry out harsh after, carry out single exposure again, conditions of exposure is identical with (5).

Steps such as top resist coating, exposure, development are generally speaking for being used for carving required electrode pattern on the PET nesa coating.

(9) demoulding is placed on the workpiece after the exposure in the KOH solution of 0.5～0.8wt.% and soaked 80～150 seconds.

(10) clean before the PI, adopt ultrasonic method for example workpiece to be placed in the KOH solution of 0.5～1.0wt.% and cleaned 5～10 minutes.

(11) be coated with PI (polyester-imide), for example with the PI solution of 1.8～2.5wt.% workpiece is coated with PI in this step by screen plate printing method, promptly respectively upper/lower electrode (being respectively the electrode on the 1st and the 2nd substrate) is coated oriented film, afterwards under 80～150 ℃ temperature with workpiece preliminary drying 1.5～2.5 minutes.The thickness of oriented film preferably is controlled to be 400～800 dusts in this step.

(12) PI solidifies, and the workpiece that was coated with PI is cured in 140～160 ℃ temperature, and be 2～3 hours set time.This step is for example carried out in known curing oven.In this step, preferably adopt low temperature PI, for example, and PI2100, its solidification temperature is about 150 ℃, and prior art processes adopts 250 ℃.

(13) rubbing is for example to utilize that rubbing machine carries out rubbing to oriented film in this step.Specifically, on described rubbing machine, comprise the roller that has flannelette,, respectively the oriented film of upper/lower electrode is rubbed obtaining required liquid crystal aligning direction with flannelette in when operation, 0.3～0.5 millimeter of friction depth, rotating speed is controlled at 800～1000 to be changeed.Above-mentioned rubbing machine is known in the art.In addition,, those skilled in the art should understand that also and can not adopt rubbing machine, for example take manual mode though be that example describes with the rubbing machine in this step.

(14) silk-screen frame sets binding material on the predetermined position of at least one substrate (for example the 1st substrate).Binding material is representational to be to have concurrently to prevent the binding material of liquid crystal material from the sealing property of leaking between a pair of substrate.Encapsulant invests the substrate circumference usually and leaves a mouth that is used to pour into liquid crystal, and the width of mouth is 1～3mm.Encapsulant can adopt epoxy bond glue.In this step, adopt the accurate contraposition of CCD (contraposition camera) camera lens, position deviation is controlled at ± 0.2 millimeter between.

(15) frame preliminary drying, under 70～80 ℃ temperature with frame preliminary drying 15～30 minutes.

(16) silk-screen firing point, this step is the silk-screen conductive gold spacer on the electrode of the 1st and the 2nd substrate, and (for example on a substrate, spray the interval powder, adopting model is the interval powder of SP-207), in this step, adopt the CCD contraposition with the accurate contraposition of cam lens, position deviation is controlled at ± 0.2 millimeter between.

(17) fit, will fit through the 1st and the 2nd substrate of above-mentioned processing.In this step, make the 1st substrate and the 2nd baseplate-laminating by binding material, binding material is configured between the 1st and the 2nd substrate, by interval powder control basal plate interval (thickness of liquid crystal).In this step, require maximum allowable offset less than 0.05 millimeter, just adopt the accurate contraposition of CCD camera lens, position deviation is controlled at ± 0.05 millimeter between.

(18) hot-press solidifying pressurizes to the 1st and the 2nd substrate of fitting with air bag, and it was solidified under 130～150 ℃ isoperibol 3～5 hours.

(19) cut according to the product size requirement, utilizes laser cutting device that workpiece is cut, position deviation is controlled at ± 0.1 millimeter between.

(20) the perfusion liquid crystal pours into liquid crystal under the condition of vacuum, and for example, TN (twisted-nematic) or STN (supertwist is to row) type liquid crystal requires vacuum tightness less than 2Pa (handkerchief).Liquid crystal material also can for example wait by instiling and provide to substrate.Because methods such as priming by vacuum liquid crystal are known in the prior art, so omitted detailed description thereof at this.

(21) UV seals, and seals with ultraviolet ray (UV) cured resin glue (for example, 3342 type UV bonded adhesivess), forms the complete sealing-in limit 10 (as shown in Figure 1) of LCD thus.Be to carry out UV to seal under the situation of giving the LCD pressurization that forms with air bag in this step, the method for air bag pressurization just makes LCD thickness even, and will flatten pressure control is 0.2～0.5kg/cm for this reason²

Can make according to ultrathin flexible liquid crystal display of the present invention by top method.Generally, before dispatching from the factory, also to carry out following cleaning, detection, packaging and other steps to LCD.For example:

Clean, steam the liquid crystal on the method cleaning workpiece surface of washing with the 141B clean-out system.

Whether range estimation has breakage, cut, stain etc. on range estimation platform inspection surface.

Electrical measurement, with electrical measurement machine test whether have lack draw, defective products such as short circuit.

Paste polaroid, stick polaroid for the qualified product upper and lower surface of above detection with trundle.

QA inspects product at last by random samples, guarantees quality.

The packing shipment.

Note, above several steps be the subsequent technique of making LCD, they are not to make the necessary step of LCD.

So far, the method for producing ultrathin flexible liquid crystal display has been described.According to the present invention, can obtain following advantage: (1), can reach 0.5～0.7 millimeter with the thickness of the flexible liquid crystal display of high molecule plastic manufacturing, than thin many of glass mould display; (2), flexible, therefore can be applied on nonplanar surface, and can be made into different shape; (3), withstand voltage, non-friable, thereby be convenient to the transportation; (4) shockproof.

Because the ultrathin flexible liquid crystal display that makes according to the present invention has many-sided advantage as above, therefore ultrathin flexible liquid crystal display according to the present invention can be applied to various fields: (1), show for example has the credit card, VIP card of Presentation Function etc.; (2), wrist-watch, for example special-shaped wrist-watch, the crooked wrist-watch etc. that shows; (3), price list, as marked price display card of using in the market etc.; (4), display, the file display; Various machine instrument displays; (5), handicraft, for example display on the Wan Qu handicraft surface etc.; (6) be used to make various billboards.

Though be described with reference to the accompanying drawings the present invention above, those of ordinary skill in the art are to be appreciated that above-mentioned explanation only is that the signal of embodiment is set forth, and scope of the present invention is not restricted to above-mentioned specific embodiment.By instruction of the present invention, those skilled in the art can make variations and modifications to the present invention, and these variations and modification are also within protection scope of the present invention.

Claims (6)

1, a kind of flexible liquid crystal display is characterized in that, described flexible liquid crystal display comprises:

The 1st substrate positioned opposite to each other and the 2nd substrate, described the 1st substrate and the 2nd substrate are made by the PET conducting film, and described the 1st substrate and the 2nd substrate lump together by the epoxy bond sticker;

Be arranged on the liquid crystal layer between the 1st substrate and the 2nd substrate;

On the apparent surface of described the 1st substrate and the 2nd substrate, be carved with the 1st required electrode and the 2nd electrode;

Be coated with oriented film on described the 1st electrode and the 2nd electrode;

Between described the 1st substrate and the 2nd substrate, also evenly be provided with the separating ball that is used to control the interval between two substrates.

2, flexible liquid crystal display as claimed in claim 1 is characterized in that, the described the 1st and the thickness of the 2nd substrate be 0.045～0.188 millimeter.

3, flexible liquid crystal display as claimed in claim 1 is characterized in that, the thickness of described oriented film is 400～800 dusts, and described oriented film is by being heating and curing and respectively described oriented film being rubbed to obtain required liquid crystal aligning direction with flannelette.

4, flexible liquid crystal display as claimed in claim 1 is characterized in that, described the 1st electrode and/or the 2nd electrode are provided with firing point, and described firing point forms by the silk-screen conductive gold spacer.

5, flexible liquid crystal display as claimed in claim 1 is characterized in that, described separating ball was evenly sprayed before fitting to be arranged on the described the 1st and/or the 2nd electrode.

As the arbitrary described flexible liquid crystal display of claim 1～5, it is characterized in that 6, the thickness of described LCD is 0.4～0.7 millimeter.

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