CN101424839A - LCD device - Google Patents
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- CN101424839A CN101424839A CNA200710047735XA CN200710047735A CN101424839A CN 101424839 A CN101424839 A CN 101424839A CN A200710047735X A CNA200710047735X A CN A200710047735XA CN 200710047735 A CN200710047735 A CN 200710047735A CN 101424839 A CN101424839 A CN 101424839A
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Abstract
The invention relates to a liquid crystal display device which comprises an array base plate, a colored filter base plate arranged relatively to the array base plate, a metal layer with an earth potential, and a black matrix layer positioned at one side of the colored filter base plate, wherein the array base plate and the colored filter base plate are connected by a sealant; the metal layer with an earth potential is distributed at one side of the array base plate and a conducting layer is formed on the metal layer with an earth potential; and a conducting component is formed between the conducting layer and the black matrix layer and is connected with the conducting layer and the black matrix layer. The liquid crystal display device can prevent an opening part from forming a longitudinal direct current biasing electric field and ensure enough and stable earth potential on a black matrix, thereby eliminating an afterimage in an image and improving the quality of the liquid crystal display device.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator, particularly can eliminate the liquid crystal indicator of image retention.
Background technology
Most shares that advantages such as thin-film transistor LCD device is frivolous with it, power saving, environmental protection have been captured the monitor market gradually.Along with popularizing of liquid crystal indicator, feasible performance requirement to liquid crystal indicator increases gradually, such as high brightness, high-contrast, wide angle of visibility, high chroma territory, high response speed etc.In addition, people require also more and more higher to image quality such as the Mu La of liquid crystal indicator, image retentions.
Image retention is the defective that the liquid crystal indicator size is done a highly significant of big back existence, and in transverse electric field formula liquid crystal indicator, the image retention defective is very obvious especially.Image retention is meant when LCD is long-time and shows a fixing picture that when picture was switched to next picture, original fixing picture can remain in the next picture.From the time angle, image retention is divided into long-term image retention and short-term image retention.From shaped angles, image retention is divided into face image retention and line image retention.
In liquid crystal indicator, liquid crystal molecule can not be fixed on some voltage always, and just a certain state is constant, otherwise the characteristic of liquid crystal molecule can be destroyed, and can't rotate in response to the variation of electric field again, to form different GTGs.In order to tackle this extreme case of the picture that shows same GTG always, the display voltage in the LCD just has been divided into two kinds of polarity, and one is positive polarity, and another is a negative polarity.When the voltage of show electrode is higher than public electrode voltages, just be referred to as positive polarity.And when the voltage of show electrode is lower than the voltage of public electrode, just be referred to as negative polarity.No matter be positive polarity or negative polarity, the GTG of one group of same brightness can be arranged all.So when liquid crystal panel up and down the pressure reduction absolute value of layer glass be fixedly the time, this voltage difference is similar to be a kind of alternating voltage.Under desirable AC field situation, be this defective of image retention to occur in the liquid crystal panel.
The appearance of image retention needs two pacing itemss: one is the ion-type impurity, and one is the DC voltage composition.When the DC voltage composition occurring in the panel of liquid crystal indicator, can move along this DC electric field direction for the ion-type impurity in the liquid crystal panel, and accumulate on the alignment film.DC electric field is big more, and the ion-type impurity of gathering is just many more.Same picture, the time that just same DC electric field occurs is of a specified duration more, and the ion-type impurity of gathering also can be many more.The ion that gathers together can form one with the opposite DC electric field of original DC electric field direction.This reverse DC electric field that forms when the ion concentration of assembling be enough to change liquid crystal indicator see through efficient the time, will cause the display effect of liquid crystal indicator difference to occur.That is to say, when liquid crystal indicator when a last fixed image switches to next picture, DC electric field originally disappears, but the ion that accumulates on the alignment film can't leave alignment film at once, and make this reverse DC electric field exist, to continue to keep the image of an original last picture, therefore image retention, just so-called image retention appear.
As mentioned above, the appearance of image retention needs two pacing itemss: one is the ion-type impurity, and one is the DC voltage composition.Eliminate any one pacing items and can eliminate image retention.The most effectual way of eliminating the ion-type impurity is exactly the cleanliness factor that improves separately.For transverse electric field formula liquid crystal indicator, the electric field that drives liquid crystal work is parallel to this plane of substrate.If in the vertical substrate in-plane DC electric field that superposeed, this vertical dc offset voltage in the liquid crystal panel will cause the image retention effects of picture under the effect of ion-type impurity so.
Fig. 1 has provided the formation mechanism of longitudinal electric field in the transverse electric field formula liquid crystal indicator.Be positioned at black matrix" 5 (the B1ack Matrix of colored filter substrate 1B one side, BM) current potential is floated, after the effect of bus potential such as data line 4, pixel electrode 2 and public electrode 3, BM5 is last can to induce and total consistent and opposite polarity current potential of line generalization current potential on being subjected to from array base palte 1A.Colored filter 6 contacts with BM5 and overlaps each other, because BM5 is charged, will induce opposite polarity current potential on the colored filter 6 aside.This DC potential that induces on colored filter 6 just forms longitudinal electric field 7 in the open area of liquid crystal indicator.
At this vertical dc offset voltage of transverse electric field formula liquid crystal indicator, existing method mainly contains two kinds: 1, use the low-resistivity liquid crystal; 2, use the liquid crystal doping techniques.Use the low-resistivity liquid crystal can reduce the voltage retention performance of liquid crystal, and cause the display quality problem of other picture flickers and so on.Use the liquid crystal doping techniques, increased manufacturing cost on the one hand, on the other hand the display quality problem that can bring the point-like nurse to draw and so in liquid crystal drop following time.Existing these two kinds of methods at vertical direct current biasing electric field can not fundamentally contact vertical direct current biasing electric field.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of liquid crystal indicator, and this liquid crystal indicator prevents that opening portion from forming vertical direct current biasing electric field.
For reaching above-mentioned purpose, the invention provides a kind of liquid crystal indicator, it comprises array basal plate, one colored filter substrate with respect to the array base palte setting, connect with sealing-in glue between two substrates, distributing in array base palte one side and to be with earthy metal level, be positioned at the black-matrix layer of colored filter substrate one side, its substantive distinguishing features is, be with formation one conductive layer on earthy metal level, form a conducting element between conductive layer and black-matrix layer, this conducting element is connected with conductive layer, black-matrix layer.
The present invention is owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and good effect: by on the black matrix" of colored filter substrate, applying a stable earth potential, guarantee that each display unit in the viewing area is no matter under the display frame of what contrast, opening portion can not form vertical direct current biasing electric field, does not more exist owing to showing the different phenomenon that causes vertical direct current biasing electric field level inequality of contrast.Under the sufficiently stable prerequisite of earth potential on the assurance black matrix", can there be the phenomenon that causes vertical direct current biasing electric field level inequality owing to the black matrix" current potential is inconsistent in the opening portion of the display unit in the viewing area on the diverse location.Because transverse electric field formula liquid crystal indicator provided by the invention can be eliminated the vertical direct current biasing electric field in the viewing area, form a requirement of image retention thereby eliminated, thereby can eliminate the image retention of picture, improve the quality of liquid crystal indicator.In addition,, just can mask the transparency conducting layer of black-matrix layer reverse side, reduce engineering cost because black-matrix layer has a stable earth potential.
Description of drawings
Fig. 1 is the structural representation of transverse electric field formula liquid crystal indicator in the prior art;
Fig. 2 is the first embodiment planimetric map of liquid crystal indicator of the present invention;
Fig. 3 is the A-A sectional view of liquid crystal indicator sealing-in glue periphery in Fig. 2;
Fig. 4 is the second embodiment synoptic diagram of liquid crystal indicator of the present invention;
Fig. 5 is the 3rd embodiment synoptic diagram of liquid crystal indicator of the present invention;
Fig. 6 is the 4th embodiment synoptic diagram of liquid crystal indicator of the present invention;
Fig. 7 is the 5th embodiment synoptic diagram of liquid crystal indicator of the present invention;
Fig. 8 is the 6th embodiment synoptic diagram of liquid crystal indicator of the present invention;
Fig. 9 is the 7th embodiment synoptic diagram of liquid crystal indicator of the present invention.
Embodiment
Below with reference to accompanying drawing liquid crystal indicator of the present invention is described in further detail.
Fig. 2 is the first embodiment planimetric map of liquid crystal indicator of the present invention.As shown in Figure 2, this liquid crystal indicator is a transverse electric field formula liquid crystal indicator, and it comprises an array basal plate 11A and a colored filter substrate 11B, and what connect array base palte 11A and colored filter substrate 11B is sealing-in glue 16.The alignment film that array base palte 11A one side comprises signal wire terminal 13, sweep trace terminal 12, viewing area PX, viewing area periphery and is covered in the viewing area.The coordination hole that on four angles of this display device, is connecting transmission electrode 14 in addition.Colored filter substrate 11B one side comprises viewing area and viewing area periphery, and the viewing area distributes and focuses on redness, green and the blue colored filter of multiple bank row, and is covered with alignment film in the top, viewing area, and is relative with the alignment film of array side.Colored filter substrate viewing area periphery is covered with complete black-matrix layer 15.Be connected with sealing-in glue 16 by transmission electrode 14 between the zero potential metal level of the black matrix" 15 of colored filter substrate 11B periphery and array base palte 11A periphery.
Fig. 3 has provided the A-A sectional view of liquid crystal indicator sealing-in glue periphery in Fig. 2.In Fig. 3, around the viewing area of array base palte 11A one side, the below that is positioned at sealing-in glue 16 metal level 20 of band earth potential (zero potential GND) that distributing.Above this ground metal layer 20, form the via hole of insulation course, and above this via hole, cover conductive layer 21 by etching technics.Above the conductive layer 21 to being that one deck is formed at the sealing-in glue 16 that is connecting colored filter substrate 11B and array base palte 11A around the panel between the colored filter substrate 11B, be mixed with the gold goal 22 of conduction usefulness in 16 li in sealing-in glue.In colored filter substrate 11B one side, that pasting sealing-in glue 16 is black-matrix layer 15 (BM), and BM layer 15 contacts with gold goal 22 in the sealing-in glue 16.By conductive layer 21 earth potential is directed on the gold goal 22, by gold goal 22 earth potential is transferred on the BM layer 15 of colored filter substrate 11B again, make BM layer 15 band earth potential.
It can also be seen that from Fig. 3 liquid crystal is sealed between colored filter substrate 11B and the array base palte 11A by sealing-in glue 16.Alignment film 18 and the alignment film 19 on the array base palte 11A on the colored filter substrate 11B distribute in opposite directions, cover simultaneously in the PX of viewing area, and maintain a segment distance with sealing-in glue 16.The colored filter 17 that between alignment film 18 and BM layer 15, also has red, green, blue three looks.In becoming the box engineering, need be with the UV UV-irradiation sealing-in glue sealing-in glue 16 that hardens.In the described earth potential transmission plan of Fig. 4, the black matrix" of colored filter substrate 11B one side 15 directly touches with the interior gold goal 22 of sealing-in glue 16 and sealing-in glue 16.At this time, the UV UV-irradiation has dual mode, and a kind of is to carry out the irradiation of UV ultraviolet light from colored filter substrate one side; A kind of is to carry out the irradiation of UV ultraviolet light from array base palte one side.When colored filter substrate one side is carried out the UV UV-irradiation, be list structure with the contacted black matrix" of sealing-in glue, perhaps be fenestral fabric.Purpose is exactly to allow the UV ultraviolet light can be from the space between the strip black-matrix layer, perhaps sees through in the space of latticed black-matrix layer to shine on the sealing-in glue.Except two kinds of above-mentioned black matrix patterns, can also adopt other various interior gold goals of black matrix" and sealing-in glue that can allow contact, again the pattern that can allow the UV ultraviolet light see through from the slit between the black-matrix layer.When array base palte one side is carried out the UV UV-irradiation, be list structure with the contacted ground metal layer of sealing-in glue, perhaps be fenestral fabric.
On the black-matrix layer 15 that the earth potential on the array base palte 11A is transferred to colored filter substrate 11B by sealing-in glue 16, can also the earth potential of array side be transferred on the black-matrix layer of colored filter substrate by the transmission electrode of silver coating slurry.Fig. 4 is the second embodiment synoptic diagram of liquid crystal indicator of the present invention, and just liquid crystal indicator is at the stereographic map of transmission electrode periphery.As shown in Figure 4, do not have transparent organic membrane to cover the BM layer at the viewing area periphery, BM layer 15 is starched with the silver in the transmission electrode 14 and is directly contacted.In Fig. 6, above the ground metal layer 20 on the array base palte one deck insulating film layer is arranged, by formation via hole 24 on the dielectric film of etching technics below transmission electrode, and there is a conductive layer 21 to be covered on this via hole 24.By this layer conductive layer 21 earth potential is directed on the silver slurry, by the silver slurry earth potential is transferred on the black matrix" BM layer 15 of colored filter substrate 11B again, make BM layer 15 band earth potential.
The black matrix" of colored filter side can generate with the chromium metal, also can generate with the resin material that contains carbon.No matter what material to generate black matrix" with, black matrix" all can conduct electricity.According to top introduction, the earth potential of array side is directed on the black-matrix layer of colored filter side after, black matrix" is just with a last stable earth potential.The bus potential size that is positioned at array side is reference potential with the earth potential, so bus potential can not induce vertical direct current biasing electric field of any size on black matrix".Equally, because black matrix" has a stable earth potential, can not induce any electric charge not of uniform size on the colored filter of black matrix" pasting, so vertical direct current biasing electric field that the electric charge that induces on the former cause colored filter forms has just disappeared yet.Just eliminated as an essential condition that forms image retention, image retention has also just been eliminated naturally.
In order to realize above-mentioned liquid crystal indicator, can finish by following method manufacturing.Below just introduce the forming process of array base palte and colored filter substrate respectively:
For array base palte, the same with the array base palte that generates common liquid crystal indicator, use technologies such as magnetron sputtering, chemical vapor deposition, etching on the glass substrate of array one side, to form thin film transistor (TFT) array and respective display unit array.On this basis, finish the peculiar structure of liquid crystal indicator provided by the invention simultaneously.
At first, on sealing-in glue position and transmission electrode position, form the metallic pattern that earthing potential is used with a certain metal level.The earth potential of these metallic patterns is introduced by signal wire terminal or sweep trace terminal.The top of metallic pattern can deposit one deck dielectric film, and its material can be a silicon nitride, also can be monox or silicon oxynitride.
Then, by the mask of insulating film layer, utilize exposure technology and etching process to form passivation layer via hole above with metallic pattern at earthing potential.
At last, on substrate, deposit a layer thickness 100
To 3000
The electrically conducting transparent layer film, its material mainly be tin indium oxide (Indium Tin Oxide, ITO).Use the transparency conducting layer mask plate,, form the conductive pattern that covers via hole by exposure technology and etching process.
For colored filter substrate, technology is simple relatively, and concrete manufacture process is as follows:
At first, at the back side of glass coating one deck ITO conductive layer.
Then, on glass substrate, form the black matrix" figure.Around the viewing area, generate black matrix" comprehensively.
Then, on black matrix", form red colored filter, green tint colo(u)r filter and blue color colo(u)r filter respectively.Colored filter only forms in the viewing area.
At last, divide not contain transparent organic membrane and contain two kinds of situations of transparent organic membrane according to the actual needs of colored filter substrate and introduce corresponding manufacturing process successively.If do not contain transparent organic membrane, color filter technology is arrived, and this finishes.If contain transparent organic membrane, transparent organic membrane only forms in the viewing area, and covers colored filter.
Before colored filter substrate and array base palte applying, around the viewing area of array base palte, be positioned at top coating one deck sealing-in glue that the ground metal layer design has via hole and transparent ITO conducting layer figure.In sealing-in glue, be mixed with the gold goal of conduction usefulness.After colored filter substrate and array base palte applying, gold goal is squeezed between black matrix" and transparent ITO conducting layer figure and closely contacts with transparent ITO conducting layer figure with black matrix" respectively.Like this, just the earth potential on the array base palte is transferred on the black-matrix layer of colored filter substrate by the gold goal in the sealing-in glue.Design sketch after colored filter substrate and array base palte are fitted as shown in Figure 3.
For the earth potential of array base palte being transferred on the black-matrix layer of colored filter substrate one side, except two kinds of methods introducing previously, can also be directed to colored filter substrate one side to the earth potential of array base palte one side by conductive gap in colored filter substrate one side.Conductive gap can be positioned at the viewing area, also can be distributed in the viewing area periphery.
Fig. 5 is the 3rd embodiment synoptic diagram of liquid crystal indicator of the present invention, and it has provided the earth potential transmission synoptic diagram of viewing area periphery conductive gap.As can be seen from Figure 5, conductive gap 25 is between BM layer 15 and conductive layer 26, and be connected with conductive layer 26 with BM layer 15, conductive layer 26 is positioned at ground metal layer 20 tops and is in contact with it connection, ground metal layer 20 is arranged in insulation course 28, insulation course 28 tops are provided with passivation layer 27, these conductive layer 26 materials mainly be tin indium oxide (Indium Tin Oxide, ITO).The transmission mode of gold goal is more approaching in earth potential transmission mode at this time and the sealing-in glue, ground metal layer 20 is transferred to earth potential on the BM layer 15 by conductive layer 26, conductive gap 25, make BM layer 15 have a stable earth potential, actual is exactly to have replaced gold goal to realize that earth potential is transferred on the black-matrix layer of colored filter side from array side with the conductive gap filial generation always.
Fig. 6 is the 4th embodiment synoptic diagram of liquid crystal indicator of the present invention, and it has provided the earth potential transmission synoptic diagram of conductive gap in the viewing area.In the viewing area, use conductive gap 25 to remove the locational alignment film 30 of conductive gap, make conductive gap 25 directly pass colored filter 29 and be connected with BM layer 15.Using conductive layer 26 that earth potential is also needed with second metal level ITO conductive layer 26 to be raised,, realize electric action well simultaneously when the first metal layer on glass extracts so that conductive layer 26 closely contacts with conductive gap 25 as ITO and so on.
Smooth as far as possible for what colored filter substrate was done, tend on colored filter substrate, cover the transparent organic membrane that one deck resin is done.Noted earlier, transparent organic membrane only is made in the viewing area, and covers colored filter, need with a mask or by the mode of all edge exposures the transparent organic membrane of viewing area periphery to be removed especially.Increase engineering cost.On colored filter substrate, cover in the transparent organic membrane, under the situation that does not increase engineering cost, can adopt design philosophy provided by the invention equally.In liquid crystal indicator provided by the invention, why can provide a stable earth potential to be because black matrix" can conduct electricity to black matrix".Equally, cover in the transparent organic membrane on colored filter substrate, wanting provides a stable earth potential just to require transparent organic membrane to want and can conduct electricity to transparent organic membrane.The transparent organic membrane that ensuing scheme just is based on conduction divides gold goal conduction and 2 kinds of situations of gap electronic conduction to describe respectively.
Fig. 7 is the 5th embodiment synoptic diagram of liquid crystal indicator of the present invention, the gold goal conduction mode when it has provided transparent organic membrane zero potential.In this conduction mode, the transparent organic membrane 31 of conduction directly is connected with gold goal 22 contacts, and colored filter one side of corresponding sealing-in glue 16 does not cover black matrix" 15.Under this this pattern, can directly shine the UV ultraviolet lights to sealing-in glue 16, sealing-in glue 16 is carried out cure process from colored filter substrate 11B one side.
Fig. 8 is the 7th embodiment synoptic diagram of liquid crystal indicator of the present invention for the 6th embodiment synoptic diagram of liquid crystal indicator of the present invention, Fig. 9.The earth potential that Fig. 8 and Fig. 9 have provided conductive gap in the earth potential transmission synoptic diagram that uses viewing area periphery conductive gap behind the transparent organic membrane and the viewing area respectively transmits synoptic diagram.As can be seen from Figure 8, gold goal conduction mode in earth potential transmission mode at this time and the sealing-in glue is more approaching, conductive gap 25 directly is connected with transparent organic membrane 31 contacts, and actual is exactly to have replaced gold goal to realize that earth potential is transferred on the black-matrix layer of colored filter side from array side with the conductive gap filial generation.Fig. 9 has provided the earth potential transmission synoptic diagram of conductive gap in the viewing area.With introduce previously the same, in the viewing area, use conductive gap 25 to remove conductive gap 25 locational alignment films 30, conductive gap 25 directly is connected with transparent organic membrane 31 contacts, simultaneously using conductive layer that earth potential is also needed with second metal level ITO conductive layer to be raised when the first metal layer on glass extracts as ITO and so on, so that the ITO conductive layer closely contacts with conductive gap, realize electric action well.Because transparent organic membrane is whole coating in colored filter one side, so, provide one stable just can guarantee that the whole plane of colored filter substrate one side all is in stable earth potential earthy the time for transparent organic membrane, can mask the electrostatic interference that comes from the outside on the one hand, also can eliminate simultaneously the vertical DC electric field in the display device, thereby eliminate image retention.
By on the black matrix" of colored filter substrate, applying a stable earth potential, guarantee that each display unit in the viewing area is no matter under the display frame of what contrast, opening portion can not form vertical direct current biasing electric field, does not more exist owing to showing the different phenomenon that causes vertical direct current biasing electric field level inequality of contrast.Under the sufficiently stable prerequisite of earth potential on the assurance black matrix", can there be the phenomenon that causes vertical direct current biasing electric field level inequality owing to the black matrix" current potential is inconsistent in the opening portion of the display unit in the viewing area on the diverse location.Because transverse electric field formula liquid crystal indicator provided by the invention can be eliminated the vertical direct current biasing electric field in the viewing area, form a requirement of image retention thereby eliminated, thereby can eliminate the image retention of picture, improve the quality of liquid crystal indicator.In addition,, just can mask the transparency conducting layer of black-matrix layer reverse side, reduce engineering cost because black-matrix layer has a stable earth potential.
That more than introduces only is based on preferred embodiment of the present invention, can not limit scope of the present invention with this.Any measurement mechanism of the present invention is done replacement, the combination, discrete of step well know in the art, and the invention process step is done well know in the art being equal to change or replace and all do not exceed exposure of the present invention and protection domain.
Claims (12)
1. liquid crystal indicator, it comprises array basal plate, one colored filter substrate with respect to the array base palte setting, connect with sealing-in glue between two substrates, distributing in array base palte one side and be with earthy metal level, be positioned at the black-matrix layer of colored filter substrate one side, it is characterized in that, being with formation one conductive layer on earthy metal level, between conductive layer and black-matrix layer, form a conducting element, this conducting element is connected with conductive layer, black-matrix layer.
2. liquid crystal indicator as claimed in claim 1 is characterized in that, described conducting element is a gold goal.
3. liquid crystal indicator as claimed in claim 2 is characterized in that described gold goal is positioned at sealing-in glue.
4. liquid crystal indicator as claimed in claim 1 is characterized in that, described conducting element is a transmission electrode.
5. liquid crystal indicator as claimed in claim 4 is characterized in that, silver coating slurry in the described transmission electrode.
6. liquid crystal indicator as claimed in claim 1 is characterized in that, described conducting element is conductive gap.
7. liquid crystal indicator as claimed in claim 1 is characterized in that, described conductive is a tin indium oxide.
8. liquid crystal indicator as claimed in claim 1 is characterized in that, described sealing-in glue is hardened by UV-irradiation.
9. liquid crystal indicator as claimed in claim 1 is characterized in that described black-matrix layer is list structure.
10. liquid crystal indicator as claimed in claim 1 is characterized in that described black-matrix layer is fenestral fabric.
11. liquid crystal indicator as claimed in claim 1 is characterized in that, transparent organic membrane is set on the described colored filter substrate covers black-matrix layer.
12. liquid crystal indicator as claimed in claim 11 is characterized in that, described transparent organic membrane is the organic membrane of conduction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710047735XA CN101424839A (en) | 2007-11-02 | 2007-11-02 | LCD device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710047735XA CN101424839A (en) | 2007-11-02 | 2007-11-02 | LCD device |
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| CN101424839A true CN101424839A (en) | 2009-05-06 |
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| CNA200710047735XA Pending CN101424839A (en) | 2007-11-02 | 2007-11-02 | LCD device |
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