CN100426101C - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN100426101C CN100426101C CNB2005100355902A CN200510035590A CN100426101C CN 100426101 C CN100426101 C CN 100426101C CN B2005100355902 A CNB2005100355902 A CN B2005100355902A CN 200510035590 A CN200510035590 A CN 200510035590A CN 100426101 C CN100426101 C CN 100426101C
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Abstract
The present invention relates to a liquid crystal display. The liquid crystal display comprises a first, a second substrate corresponding to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate, wherein a plurality of data lines are arranged on the first substrate, a plurality of light sensing spacers are arranged on the first substrate and the second substrate, and the light sensing spacers are positioned above the data lines and overlapped with at least a part of the data lines. Coupling capacitance value between the data lines and a pixel electrode is low since the dielectric constant of the light sensing spacers is lower than that of the liquid crystal layer in the liquid crystal display, and light sensing spacers are overlapped with at least a part of the data lines. Therefore, the influence of cross interference is reduced, and image quality is favorable when the liquid crystal display works.
Description
[technical field]
The present invention relates to a kind of LCD.
[background technology]
Seeing also Fig. 1, is a kind of cut-open view of prior art LCD.This LCD 1 comprises first substrate 11, second substrate 12 relative with this first substrate 11, be positioned at colored filter 15 on this first substrate 11, be positioned at the liquid crystal layer 13 and the interval dose 14 of 12 of this first substrate 11 and second substrates.Wherein this interval dose 14 transparent ball normally is used to support first substrate 11, thereby forms the clearance space of filling liquid crystal layer 13 between first substrate 11 and second substrate 12.In this LCD 1, because interval dose 14 is randomly dispersed on second substrate 12 by special-purpose spreading machine usually, its material is glass or plastics normally, may cause problems such as diffraction, contrast decline or gravity disorder.
For addressing the above problem, industry proposes another kind of LCD shown in Figure 2.This LCD 2 comprises first substrate 21, second substrate 22 relative with this first substrate 21 and is positioned at this first substrate 21 and the liquid crystal layer 23 of 22 of second substrates.
This first substrate 21 is provided with colored filter 26 and black matrix" 25; this black matrix" 25 and colored filter 26 tops are disposed with a diaphragm 241 and tin indium oxide (Indium Tin Oxide; ITO) layer 240; these indium tin oxide layer 240 tops are arranged at intervals with sensitization separation material (Photospacer) 24; this sensitization separation material 24 is fixedly installed on certain or some position on first substrate 21 usually; be used to support first substrate 21, thereby between first substrate 21 and second substrate 22, form the clearance space of filling liquid crystal layer 23.Equally, this sensitization separation material 24 is transparent materials.Adopt this sensitization separation material 24, can increase the uniformity coefficient in crack between first substrate 21 and second substrate 22, thereby improve the resistance to impact of this LCD 2; In addition, adopt this structure, can also improve the contrast of this LCD 2 and reduce light leak.
In this structure, because this sensitization separation material 24 is positioned at this indium tin oxide layer 240 tops, after first substrate 21 and second substrate 22 were fitted, this sensitization separation material 24 only was used to support first substrate 21, to form the space of a filling liquid crystal layer 23 between first substrate 21 and second substrate 22.But in large-sized this kind LCD, because resolution is higher relatively, the quantity of its corresponding pixel electrode, public electrode, data line and concentric line is comparatively huge, gap each other is less, when LCD is in running order, various signals are transmission simultaneously between different circuits and electrode, owing to all there is the electric current that flows in different circuits and the electrode, produces coupling capacitance.This coupling capacitance is a stray capacitance, can cause unnecessary signal disorder usually, industry be referred to as to crosstalk (Crosstalk).Crosstalking that coupling capacitance causes can cause signal transmission errors, and for example, what the coupling capacitance between data line and the pixel electrode caused crosstalks, and usually causes the LCD picture quality seriously to descend.
[summary of the invention]
For overcoming the bigger defective of prior art LCD coupling capacitance, provide a kind of and have the LCD of less coupling capacitance in fact for necessary.
The technical scheme that a kind of embodiment technical solution problem is adopted is: provide a kind of LCD to comprise: first substrate, second substrate that is oppositely arranged with first substrate, liquid crystal layer between this first substrate and second substrate, one side of this liquid crystal layer of vicinity of this second substrate is provided with many data lines and pixel electrode, one side of this liquid crystal layer of vicinity of one of this first substrate and second substrate is provided with a plurality of sensitization separation materials, and described sensitization separation material is positioned at this data line and this pixel electrode top and overlapping with at least a portion of this data line and this pixel electrode.
A kind of improvement as above-mentioned embodiment also comprises public electrode, and this public electrode and described pixel electrode are positioned on the same substrate, and this sensitization separation material is positioned at this public electrode top and overlapping with at least a portion of this public electrode.
Compared with prior art, in this LCD, because the specific inductive capacity of sensitization separation material permittivity ratio liquid crystal layer is little, and this sensitization separation material cover data line is all or part of, coupling capacitance between data line and the pixel electrode is less, thereby this LCD is when work, and the influence of crosstalking reduces greatly, and picture quality is better.
[description of drawings]
Fig. 1 is a kind of cut-open view of prior art LCD.
Fig. 2 is the cut-open view of another kind of prior art LCD.
Fig. 3 is the cut-open view of the LCD of first embodiment of the invention.
Fig. 4 be in the LCD shown in Figure 3 coupling capacitance between data line and the pixel electrode along with the synoptic diagram of the change in dielectric constant of sensitization separation material.
Fig. 5 be in the LCD shown in Figure 3 coupling capacitance between data line and the public electrode along with the synoptic diagram of the change in dielectric constant of sensitization separation material.
Fig. 6 is the cut-open view of the LCD of second embodiment of the invention.
Fig. 7 be in the LCD shown in Figure 6 coupling capacitance between data line and the pixel electrode along with the synoptic diagram of the change in dielectric constant of sensitization separation material.
Fig. 8 be in the LCD shown in Figure 6 coupling capacitance between data line and the public electrode along with the synoptic diagram of the change in dielectric constant of sensitization separation material.
Fig. 9 is the cut-open view of the LCD of third embodiment of the invention.
[embodiment]
Seeing also Fig. 3, is the LCD cut-open view of first embodiment of the invention.This LCD 3 comprises first substrate 31, second substrate 32 and the liquid crystal layer 34 between this first substrate 31 and second substrate 32.Contiguous liquid crystal layer 34 1 sides are coated with insulation course 321, many data lines spaced apart 322, passivation layer 323 and a plurality of pixel electrodes spaced apart 324 on this second substrate 32.Wherein data line 322 is spaced apart with pixel electrode 324.Contiguous liquid crystal layer 34 1 sides are provided with a plurality of sensitization separation materials 36 and a plurality of public electrode spaced apart 312 on first substrate 31, and this sensitization separation material 36 is positioned at directly over the corresponding data line 322 and covers the whole of this data line 322.Sensitization separation material 36 is mainly used between first substrate 31 and second substrate 32 and plays a supportive role, thereby forms the space that holds liquid crystal layer 34 between this first substrate 31 and second substrate.
When LCD 3 work, data line 322 all alives with pixel electrode 324, there is electric field E between the two, and sensitization separation material 36 is between the two, with passivation layer 323 jointly as dielectric layer, data line 322 and two electrodes of pixel electrode 324 as capacitor constitute a capacitor C.Owing to there is following capacitance computing formula
In the formula (1), C represents capacitance, and ε represents to be positioned at the specific inductive capacity of the dielectric layer between first capacitance electrode and second capacitance electrode, and A represents the useful area of this first capacitance electrode and second capacitance electrode, and d represents the thickness of this dielectric layer.Therefore, this capacitance is directly proportional with the useful area A of capacitor, is inversely proportional to the thickness d of dielectric layer.
In sum, when the useful area A of thickness d, first capacitance electrode and second capacitance electrode of dielectric layer was constant, the capacitance C that change this capacitor can realize by the DIELECTRIC CONSTANT that reduces capacitor.
In this LCD 3, sensitization separation material 36 is positioned at directly over the corresponding data line 322 and covers this data line 322, and the DIELECTRIC CONSTANT of sensitization separation material 36
PSDIELECTRIC CONSTANT less than liquid crystal layer 34
LC, promptly the specific inductive capacity of the combination layer of sensitization separation material 36 and passivation layer 321 compositions is less than the specific inductive capacity of liquid crystal layer 34 with the combination layer of passivation layer 321 compositions.According to formula (1), compare with the LCD of prior art, in the LCD 3, the coupling capacitance C between data line 322 and the pixel electrode 324
3Less, thus this LCD 3 in when work, the influence of crosstalking reduces greatly, picture quality is better.
The relative dielectric constant of supposing liquid crystal layer 34 is 8, and the thickness of liquid crystal layer 34 is 4 μ m, and Pixel Dimensions is 200 μ m
2, the relative dielectric constant of sensitization separation material 36 is 3.5～2.5, test result is as shown in Figure 4.As seen from Figure 4, when adopting specific inductive capacity to be the liquid crystal layer 34 of 2.5 sensitization separation material 36 surrogate data method lines 322 tops, coupling capacitance in the LCD 3 between data line 322 and the pixel electrode 324 has reduced by 8.8%, and capacitance reduces along with the reducing of specific inductive capacity of dielectric layer.
In addition, under these conditions, the coupling capacitance between public electrode 312 and the data line 322 with the variation between the specific inductive capacity of dielectric layer as shown in Figure 5.As seen from Figure 5, when adopting specific inductive capacity to be the liquid crystal layer 34 of 2.5 sensitization separation material 36 surrogate data method lines 322 tops, the coupling capacitance in the LCD 3 between data line 322 and the public electrode 312 has reduced by 62.3%.That is, in LCD 3, the coupling capacitance between coupling capacitance between data line 322 and the pixel electrode 324 and data line 322 and the public electrode 312 can reduce simultaneously.
Seeing also Fig. 6, is the cut-open view of the LCD 6 of second embodiment of the invention.This LCD 6 comprises first substrate 61, second substrate 62 and the liquid crystal layer 63 between this first substrate 61 and second substrate 62.Contiguous liquid crystal layer 63 1 sides are coated with insulation course 621, many data lines spaced apart 622, passivation layer 623 and a plurality of pixel electrodes spaced apart 624 and public electrode 626 on this second substrate 62.Wherein data line 622 is positioned at different layers, and public electrode 626 is positioned at one deck and spaced apart with pixel electrode 624.Contiguous liquid crystal layer 63 1 sides are provided with a plurality of sensitization separation materials 66 on first substrate 61, and this sensitization separation material 66 is positioned at directly over corresponding data line 622 and the public electrode 626, and cover half of whole and public electrode 626 of this data line 622.Sensitization separation material 66 is mainly used between first substrate 61 and second substrate 62 and plays a supportive role, thereby in space that liquid crystal layer 63 is held in this first substrate 61 and 62 formation of second substrate.
According to formula (1), in this LCD 6, sensitization separation material 66 is positioned at directly over the corresponding data line 622 and covers this data line 622, and the DIELECTRIC CONSTANT of sensitization separation material 66
PSDIELECTRIC CONSTANT less than liquid crystal layer 63
LC, promptly the specific inductive capacity of the combination layer of sensitization separation material 66 and passivation layer 621 compositions is less than the specific inductive capacity of liquid crystal layer 63 with the combination layer of passivation layer 621 compositions.Thereby, compare with the LCD of prior art, in the LCD 6, the coupling capacitance C between data line 622 and the pixel electrode 624
3Less, thus this LCD 6 in when work, the influence of crosstalking reduces greatly, picture quality is better.
The relative dielectric constant of supposing liquid crystal layer 63 is 8, and the thickness of liquid crystal layer 63 is 4 μ m, and Pixel Dimensions is 200 μ m
2, the relative dielectric constant of sensitization separation material 66 is 3.5～2.5, test result is as shown in Figure 7.As seen from Figure 7, when adopting specific inductive capacity to be the liquid crystal layer 63 of 2.5 sensitization separation material 66 surrogate data method lines 622 tops, coupling capacitance in the LCD 6 between data line 622 and the pixel electrode 624 has reduced by 8.6%, and capacitance reduces along with the reducing of specific inductive capacity of dielectric layer.
In addition, the coupling capacitance between public electrode 626 and the data line 622 with the relation between the specific inductive capacity of dielectric layer as shown in Figure 8.As seen from Figure 8, when the relative dielectric constant of supposing liquid crystal layer 63 is 8, the relative dielectric constant of sensitization separation material 66 is 3.5～2.5, simulation result shows, when adopting specific inductive capacity to be the liquid crystal layer 63 of 2.5 sensitization separation material 66 surrogate data method lines 622 tops, the coupling capacitance in the LCD 6 between data line 622 and the public electrode 626 has reduced by 36.2%.That is, in LCD 6, the coupling capacitance between coupling capacitance between data line 622 and the pixel electrode 624 and data line 622 and the public electrode 626 can reduce simultaneously.
Seeing also Fig. 9, is the cut-open view of the LCD 9 of third embodiment of the invention.This LCD 9 comprises first substrate 91, second substrate 92 and the liquid crystal layer 93 between this first substrate 91 and second substrate 92.Contiguous liquid crystal layer 63 1 sides are coated with insulation course 921, many data lines spaced apart 922, passivation layer 923 and a plurality of pixel electrodes spaced apart 924 and public electrode 926 on this second substrate 92.Wherein data line 922 is positioned at different layers, and public electrode 926 is positioned at one deck and spaced apart with pixel electrode 924.Contiguous liquid crystal layer 93 1 sides are provided with a plurality of sensitization separation materials 96 on first substrate 91, and this sensitization separation material 96 is positioned at directly over corresponding data line 922 and the pixel electrode 924, and covers the part of the whole and pixel electrode 924 of this data line 922.Certainly, this sensitization separation material 96 also can cover the whole of this pixel electrode 924.Sensitization separation material 96 is mainly used between first substrate 91 and second substrate 92 and plays a supportive role, thereby in space that liquid crystal layer 93 is held in this first substrate 91 and 92 formation of second substrate.
The invention is not restricted to the described liquid crystal display device structure of above-mentioned embodiment.Described sensitization separation material also can be positioned on second substrate.Described sensitization separation material also can only cover the part of this data line, can cover all or part of of public electrode or pixel electrode, also can cover whole pixel electrode and public electrode.Described sensitization separation material is cover data line and pixel electrode whole fully.Described pixel electrode and public electrode can adopt tin indium oxide or indium zinc oxide, and (Indium Zinc Oxide IZO) waits transparent conductive material to make, and insulation course and passivation layer can adopt materials such as silicon nitride or monox to make.
Claims (9)
1. a LCD comprises: first substrate, and first substrate second substrate, the liquid crystal layer between this first substrate and second substrate that are oppositely arranged, one side of this liquid crystal layer of vicinity of this second substrate is provided with many data lines and pixel electrode, one side of this liquid crystal layer of vicinity of one of this first substrate and second substrate is provided with a plurality of sensitization separation materials, it is characterized in that: described sensitization separation material is positioned at this data line and this pixel electrode top and overlapping with at least a portion of this data line and this pixel electrode.
2. LCD as claimed in claim 1 is characterized in that: also comprise being positioned at first substrate and second substrate public electrode on one of them.
3. LCD as claimed in claim 2 is characterized in that: described sensitization separation material is positioned at this public electrode top and overlapping with at least a portion of this public electrode.
4. LCD as claimed in claim 3 is characterized in that: described sensitization separation material and this pixel electrode are overlapping fully.
5. LCD as claimed in claim 1 is characterized in that: also comprise public electrode, described sensitization separation material is positioned at this public electrode top and overlapping with at least a portion of this public electrode.
6. LCD as claimed in claim 1 is characterized in that: described sensitization separation material is positioned on first substrate.
7. LCD as claimed in claim 1 is characterized in that: described sensitization separation material is positioned on second substrate.
8. LCD as claimed in claim 1 is characterized in that: also comprise pixel electrode, described pixel electrode adopts tin indium oxide or indium zinc oxide to make.
9. LCD as claimed in claim 1 is characterized in that: also comprise public electrode, described public electrode adopts tin indium oxide or indium zinc oxide to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100355902A CN100426101C (en) | 2005-06-25 | 2005-06-25 | Liquid crystal display device |
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| CNB2005100355902A CN100426101C (en) | 2005-06-25 | 2005-06-25 | Liquid crystal display device |
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| CN1885137A CN1885137A (en) | 2006-12-27 |
| CN100426101C true CN100426101C (en) | 2008-10-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101221962B (en) * | 2008-01-23 | 2010-09-22 | 友达光电股份有限公司 | Display backlight module including photo-sensing device, LCD panel and display equipment |
| CN108803179A (en) * | 2018-07-26 | 2018-11-13 | 京东方科技集团股份有限公司 | A kind of display panel and display device |
| CN109240008A (en) * | 2018-10-29 | 2019-01-18 | 惠科股份有限公司 | Display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641974A (en) * | 1995-06-06 | 1997-06-24 | Ois Optical Imaging Systems, Inc. | LCD with bus lines overlapped by pixel electrodes and photo-imageable insulating layer therebetween |
| US20040125301A1 (en) * | 2002-12-30 | 2004-07-01 | Lee Jae Kyun | In-plane switching mode liquid crystal display device |
| CN1576970A (en) * | 2003-06-27 | 2005-02-09 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and method of fabricating the same |
-
2005
- 2005-06-25 CN CNB2005100355902A patent/CN100426101C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641974A (en) * | 1995-06-06 | 1997-06-24 | Ois Optical Imaging Systems, Inc. | LCD with bus lines overlapped by pixel electrodes and photo-imageable insulating layer therebetween |
| US20040125301A1 (en) * | 2002-12-30 | 2004-07-01 | Lee Jae Kyun | In-plane switching mode liquid crystal display device |
| CN1576970A (en) * | 2003-06-27 | 2005-02-09 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and method of fabricating the same |
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