CN1532593A - Liquid crystal display device and its producing method - Google Patents
Liquid crystal display device and its producing method Download PDFInfo
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- CN1532593A CN1532593A CNA031140327A CN03114032A CN1532593A CN 1532593 A CN1532593 A CN 1532593A CN A031140327 A CNA031140327 A CN A031140327A CN 03114032 A CN03114032 A CN 03114032A CN 1532593 A CN1532593 A CN 1532593A
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Abstract
The present invention relates to LCD device and its making process. The device includes one pair of base boards including the first one and the second one, one sandwiched liquid crystal layer in between, several pairs of electrodes formed on the second base board, and directional film on one side of the second base board with orientation structure on the surface. The LCD device has relatively high light penetrating rate and relatively low drive voltage, and has no orientation structure on the side of the first base board resulting in simple production process and high product quality.
Description
[technical field]
The invention relates to a kind of liquid crystal indicator, particularly about a kind of in-plane change wide viewing angle liquid crystal display device (In-Plane Switching Liquid Crystal Display, IPSLCD) and preparation method thereof.
[background technology]
Liquid crystal indicator has a pair of substrate respect to one another, and the cell gap of two substrates remains definite value about making by the distribution interval dose, and has liquid crystal to inject between the substrate.When applying driving voltage, the orientation change of liquid crystal molecule, the birefringence of liquid crystal layer also changes.The characteristic of utilizing the liquid crystal layer birefringence index to change, liquid crystal indicator is finished Presentation Function.The original state of liquid crystal molecule is regularly arranged as far as possible, and the surface state of substrate surface substrate layer just can be adjusted the interaction of liquid crystal molecule and substrate like this.
At present, most widely used adjustment technology is that the alignment materials that will be used for liquid crystal alignment layer is applied to the surface of real estate to liquid crystal layer, to the material dry solidification that is applied, rub and the formation orientation texture, like this, near the liquid crystal molecule the substrate is basic identical with respect to the inclination angle (tilt angle) of substrate.
In-plane changes the wide viewing angle liquid crystal display device technology and changes the electric field perpendicular to orientation substrate of controlling liquid crystal in traditional liquid crystal indicator into be parallel to orientation substrate electric field, under the control of this electric field, liquid crystal molecule only needs to rotate in surface level, and has saved deflection in vertical direction.Yet usually all there is orientation texture in the both sides substrate, is subjected to the control of strong orientation power, and applying behind the driving voltage is not that all liquid crystal molecules all twist.Change wide viewing angle liquid crystal display device as the in-plane that is positioned at same substrate for drive electrode, liquid crystal molecule anomaly face electrode distance is bigger on the thickness of liquid crystal layer direction, its suffered electric field force is littler, molecule reverses more difficult, thereby the driving voltage of the liquid crystal indicator of parallel electric field driving is higher usually, energy consumption is bigger, and light transmittance is low.
On July 22nd, 1997, China national Department of Intellectual Property discloses a kind of parallel electric field liquid crystal indicator that only is provided with orientation texture in colored filter one side, and number of patent application is 97113223.See also Fig. 1, form colored filter 12 on the surface of a substrate 11, form an alignment film 13 on the colored filter 12, the surface of alignment film 13 is provided with orientation texture 131.Form thin film transistor (TFT) 15 on the surface of another substrate 14 and be used for applying the counter-electrodes 17 of parallel electric field, and on thin film transistor (TFT) 15 and counter-electrodes 17, form dielectric film 18, form one on the dielectric film 18 and have alignment film 19, the weak alignment capability of alignment film 19 realizes through a heat treatment process.When voltage is applied between the counter-electrodes 17, with the parallel electric field 171 that produces shown in Fig. 1 dotted line.
This parallel electric field liquid crystal indicator 1 is to form an alignment film 13 on the colored filter 12 of substrate 11 1 sides, the surface of alignment film 13 is provided with orientation texture 131, because counter-electrodes 17 is positioned at second substrate, 14 1 sides, thereby when applying electric field, the suffered electric field force of liquid crystal molecule in the liquid crystal layer 16 of colored filter 12 1 sides a little less than, and be subjected to the influence of the strong orientation power of orientation texture 131, liquid crystal molecule in the liquid crystal layer 16 of colored filter 12 1 sides is difficult to reverse, and light transmittance is lower.Simultaneously, usually the cost of colored filter 12 accounts for about 23% of entire liquid crystal display device 1 total cost, thereby, directly carrying out the orientation processing at substrate surface compares, when carrying out the orientation processing on colored filter 12 surfaces, deficient manufacturing procedure can make cost improve greatly, and carries out orientation on colored filter 12 surfaces and handle yields also to handle yields low than directly carrying out orientation at substrate surface.Moreover, dielectric film 18 sides of this parallel electric field liquid crystal indicator 1 have the alignment film 19 of a weak orientation ability, structure reaches the effect of the liquid crystal molecule easy deflection under parallel electric field drives in the liquid crystal layer 16 whereby, and it makes the structure of whole parallel electric field liquid crystal indicator 1 more complicated, cost is high.
[summary of the invention]
For solving the low and high problem of cost of prior art LCD light transmittance, the invention provides a kind of have high light penetrance and lower-cost wide viewing angle liquid crystal display device.
For solving the low problem of method for making yields of prior art LCD, the invention provides the method for making of the higher above-mentioned liquid crystal indicator of a kind of processing procedure yields.
Liquid crystal indicator of the present invention comprises: first substrate of pair of opposing and second substrate, are clipped in liquid crystal layer between this two substrates, manyly are formed on the alignment film that dielectric film and on this counter-electrodes and this thin film transistor (TFT) is formed on second substrate, one side to being formed on the counter-electrodes on second substrate, a plurality of thin film transistor (TFT), that is formed on second substrate, this alignment film surface has orientation texture, and this first substrate surface is level and smooth.
The method for making of liquid crystal indicator of the present invention may further comprise the steps: prepare first substrate and second substrate; On second substrate, form a plurality of thin film transistor (TFT)s; On second substrate, form many to counter-electrodes; On this counter-electrodes and this thin film transistor (TFT), form dielectric film; Form alignment film in second substrate, one side; Alignment film is carried out orientation handle, form orientation texture; First substrate and the second real estate opposite are placed and liquid crystal is injected therebetween.
Compared to existing technology, the advantage of liquid crystal indicator of the present invention and preparation method thereof is: only form orientation texture in second substrate, one side, near the liquid crystal molecule first substrate is not subjected to the influence of orientation power, thereby can reduce driving voltage, improves light transmittance; Owing to handle lowlyer and yields is high carrying out orientation on the substrate, thereby can reduce manufacturing cost than on colored filter, carrying out the orientation processing cost.
[description of drawings]
Fig. 1 is the cut-open view of prior art liquid crystal indicator.
Fig. 2 is the cut-open view of liquid crystal indicator of the present invention.
Fig. 3 is not liquid crystal molecular orientation synoptic diagram during making alive of liquid crystal indicator of the present invention.
[embodiment]
Please refer to Fig. 2, liquid crystal indicator 2 of the present invention comprise first substrate 21 of pair of opposing and second substrate 24, be clipped in liquid crystal layer 26, between this two substrates be located at first substrate, 21 surfaces colored filter 22, many counter-electrodes 27 and that is formed on second substrate 24 is formed on the alignment film 29 of second substrate, 24 1 sides, these alignment film 29 surfaces have orientation texture 291.
Apply voltage this many to counter-electrodes 27 between the time, produce parallel electric field 271 as shown in phantom in Figure 2 in the liquid crystal layer 26.Liquid crystal molecule can be subjected to the electric field force effect and twists in surface level in the liquid crystal layer 26.Liquid crystal molecule is bigger apart from counter-electrodes 27 distances on liquid crystal layer 26 thickness directions, and its suffered electric field force is littler, and molecule reverses more difficult.Liquid crystal indicator 2 of the present invention does not have orientation texture on the colored filter 22 of distance second substrate 24 sides far away, liquid crystal molecule in the liquid crystal layer 26 is not subjected to the anchoring energy (Anchoring Energy) of colored filter 22 and the influence of strong orientation power, under less driving voltage, can twist, and the liquid crystal molecule of many more ratios is reversed, a high proportion of more light be able to by, thereby improve light transmittance.
Seeing also Fig. 3, is the orientation synoptic diagram of the liquid crystal molecule of liquid crystal indicator of the present invention during making alive not.When not applying voltage, because second substrate, 24 1 sides have orientation texture 291, when liquid crystal molecule was arranged along the frictional direction of orientation texture 291, system capacity was minimum, be that near orientation texture 291 liquid crystal molecules trend towards arranging along the minimum direction of energy, shown in the direction of arrow among Fig. 3.Under this boundary condition, according to the non-individual body theory of minimum principle of system capacity and liquid crystal, the orientation that is positioned at the liquid crystal molecule of colored filter 22 1 sides also can be identical with near the liquid crystal molecular orientation second substrate 24.Therefore, when the liquid crystal molecule in the liquid crystal layer 26 does not apply voltage, arrange in whole thickness direction upper edge single shaft direction.
Introduce the method for making of liquid crystal indicator of the present invention below with reference to Fig. 2.Prepare first substrate 21 and second substrate 24, on second substrate 24, form a plurality of array-like thin film transistor (TFT)s 25, on second substrate 24, form many to counter-electrodes 27, on counter-electrodes 27 and thin film transistor (TFT) 25, form dielectric film 28, form alignment film 29 in second substrate, 24 1 sides, alignment film 29 is carried out orientation handle, form orientation texture 291, with the orientation of control liquid crystal layer 26 liquid crystal molecules.First substrate, 21 surface smoothings.First substrate 21 and second substrate 24 are placed face-to-face and liquid crystal is injected therebetween.The formation of alignment film 29 is mainly based on planography way.
When orientation is handled, the cylinder surface twisting cohesion of orientation equipment (figure does not show) has friction cloth, during the cylinder revolution, its surperficial cloth material promptly produces wiping to the alignment film on second substrate 24 29, form fine orientation texture 291 on alignment film 29 surfaces, make the liquid crystal molecule in the liquid crystal layer 26 form predetermined orientation.The material of alignment film 29 be polyimide (Polyimide, PI).
The method for making of liquid crystal indicator of the present invention also can be done other change design.As: can further form a colored filter 22 on first substrate, 21 surfaces, these colored filter 22 surfaces do not have alignment film, do not carry out orientation and handle; The formation of orientation texture 291 is not limited to traditional friction matching, can also adopt such as ultraviolet ray irradiation orientation (UVAlignment) and lithography orientation (Lithographic Technique of Alignment) to get; The material of alignment film 29 can also be tygon, polystyrene, polyamide (Polyamide) and polyvinyl alcohol (PVA) etc.
Claims (10)
1. liquid crystal indicator, comprise first substrate of pair of opposing and second substrate, be clipped in liquid crystal layer between this two substrates, many to be formed on the counter-electrodes on second substrate, a plurality of thin film transistor (TFT) and that is formed on second substrate is formed on the dielectric film on this counter-electrodes and this thin film transistor (TFT), it is characterized in that: this second substrate, one side has an alignment film, this alignment film surface has orientation texture, and this first substrate surface is level and smooth.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: this first substrate surface is provided with a colored filter, this colored filter surface smoothing.
3. liquid crystal indicator as claimed in claim 1 or 2 is characterized in that: the material of this alignment film is polyimide, polyamide, tygon, polystyrene or polyvinyl alcohol (PVA).
4. the method for making of a liquid crystal indicator, it may further comprise the steps: prepare first substrate and second substrate; On second substrate, form a plurality of thin film transistor (TFT)s; On second substrate, form many to counter-electrodes; On this counter-electrodes and this thin film transistor (TFT), form dielectric film; Form alignment film in second substrate, one side; Alignment film is carried out orientation handle, form orientation texture; First substrate and the second real estate opposite are placed and liquid crystal is injected therebetween.
5. the method for making of liquid crystal indicator as claimed in claim 4 is characterized in that: this method for making also is included in the step that first substrate surface forms colored filter.
6. as the method for making of claim 4 or 5 described liquid crystal indicators, it is characterized in that: the material of this alignment film is polyimide, polyamide, tygon, polystyrene or polyvinyl alcohol (PVA).
7. as the method for making of claim 4 or 5 described liquid crystal indicators, it is characterized in that: it is that friction matching is handled that this orientation is handled.
8. as the method for making of claim 4 or 5 described liquid crystal indicators, it is characterized in that: it is that ultraviolet ray irradiation orientation is handled that this orientation is handled.
9. as the method for making of claim 4 or 5 described liquid crystal indicators, it is characterized in that: it is that the lithography orientation is handled that this orientation is handled.
10. as the method for making of claim 4 or 5 described liquid crystal indicators, it is characterized in that: the generation type of this alignment film is a planography way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114032 CN1292297C (en) | 2003-03-22 | 2003-03-22 | Liquid crystal display device and its producing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114032 CN1292297C (en) | 2003-03-22 | 2003-03-22 | Liquid crystal display device and its producing method |
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| Publication Number | Publication Date |
|---|---|
| CN1532593A true CN1532593A (en) | 2004-09-29 |
| CN1292297C CN1292297C (en) | 2006-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03114032 Expired - Fee Related CN1292297C (en) | 2003-03-22 | 2003-03-22 | Liquid crystal display device and its producing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7787090B2 (en) | 2005-12-23 | 2010-08-31 | Chimei Innolux Corporation | In plane switching LCD and fringe field switching LCD |
| CN102693030A (en) * | 2011-03-21 | 2012-09-26 | 奇美电子股份有限公司 | Method for manufacturing touch display panel |
| CN103135286A (en) * | 2011-11-23 | 2013-06-05 | 三星显示有限公司 | Alignment layer |
| CN104007580A (en) * | 2013-02-26 | 2014-08-27 | 群创光电股份有限公司 | Display device |
-
2003
- 2003-03-22 CN CN 03114032 patent/CN1292297C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7787090B2 (en) | 2005-12-23 | 2010-08-31 | Chimei Innolux Corporation | In plane switching LCD and fringe field switching LCD |
| CN102693030A (en) * | 2011-03-21 | 2012-09-26 | 奇美电子股份有限公司 | Method for manufacturing touch display panel |
| CN103135286A (en) * | 2011-11-23 | 2013-06-05 | 三星显示有限公司 | Alignment layer |
| CN104007580A (en) * | 2013-02-26 | 2014-08-27 | 群创光电股份有限公司 | Display device |
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| Publication number | Publication date |
|---|---|
| CN1292297C (en) | 2006-12-27 |
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Granted publication date: 20061227 Termination date: 20170322 |