CN101206353A - Fringe field switch type lcd device - Google Patents
Fringe field switch type lcd device Download PDFInfo
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- CN101206353A CN101206353A CNA2006101577083A CN200610157708A CN101206353A CN 101206353 A CN101206353 A CN 101206353A CN A2006101577083 A CNA2006101577083 A CN A2006101577083A CN 200610157708 A CN200610157708 A CN 200610157708A CN 101206353 A CN101206353 A CN 101206353A
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Abstract
An edge electric field switch type LCD device comprises a first basal plate, a second basal plate arranged oppositely to the first basal plate, as well as a liquid crystal layer clamped between the first basal plate and the second basal plate. A plurality of scan lines and a plurality of data lines are arranged on the second basal plate and are in insulated intersection to define a plurality of pixel units. A common electrode and a pixel electrode are stacked and arranged inside each pixel unit in an insulated mode. The common electrode is in a flat plate shape structure. A plurality of notches are alternately arranged inside the pixel electrode and distributed in a fan shape, and the angle between each notch and the scan lines gradually changes. The edge electric field switch type LCD device has higher penetration rate and better viewing angle characteristics.
Description
Technical field
The invention relates to a kind of liquid crystal indicator, particularly about a kind of fringe field switch type lcd device.
Background technology
Liquid crystal indicator is because of having characteristics such as low diathermaneity, thin thickness and power consumption be low, thus day by day extensive in the use, and along with the ripe and innovation of correlation technique, its kind is also various day by day.Usually when the user watched liquid crystal indicator from different perspectives, the contrast of picture can reduce along with the increase of viewing angle, thereby produced angle limitations.Therefore, be born from liquid crystal indicator, the wide viewing angle technology is lcd technology personnel's a important subject just always.
Fringe field switch (Fringe Field Switching, FFS) technology is one of a kind of main flow wide viewing angle LCD technology that has much advantage, propose by Hyundai company, the fringe field switching technique as a whole places pixel electrode under with transparency conducting layer public electrode, pixel electrode is made difformity and is made the Electric Field Distribution multiple domainization, and electric field is more intensive, so the fringe field switching technique has wider visual angle and the penetrance of Geng Gao.
See also Fig. 1, it is a kind of structural representation of prior art fringe field switch type lcd device.This fringe field switch type lcd device 1 comprises one first substrate 11, one and second substrate 12 that is oppositely arranged of this first substrate 11, and is sandwiched in the liquid crystal layer 10 between this first substrate 11 and this second substrate 12.These first substrate, 11 contiguous these liquid crystal layer 10 1 sides set gradually a colored filter 13 and one first alignment film 14.This second substrate 12 contiguous these liquid crystal layer 10 1 sides be cascading a public electrode 15, an insulation course 16, a pixel electrode 18 and one second both alignment layers 17.
See also Fig. 2, it is the planar structure synoptic diagram of second substrate 12 shown in Figure 1.Multi-strip scanning line 121 and many data lines 122 further are set on this second substrate 12, and this multi-strip scanning line 121 and 122 insulation of this many data lines are intersected to define a plurality of pixel cells (not indicating).This sweep trace 121 is provided with a thin film transistor (TFT) 120 with these data line 122 infalls, and this thin film transistor (TFT) 120 is as a switch control device, and this sweep trace 121 provides sweep signal, and this data line 122 provides data-signal.This pixel electrode 18 and these public electrode 15 overlaids in each pixel cell, this pixel electrode 18 is a pectination, and it comprises a plurality of straight parallel bar shaped pectination branch, and this public electrode 15 is a plate-like structure.
When between this pixel electrode 18 and this public electrode 15, applying a voltage, produce fringe field between this pixel electrode 18 and this public electrode 15, liquid crystal molecule rotates in surface level under this effect of electric field.Because this pixel electrode 18 is a pectination, this public electrode 15 is a plate-like structure, an and insulation course that alternating floor thickness is very little 16 between this pixel electrode 18 and this public electrode 15, therefore Electric Field Distribution is intensive, so this fringe field switch type lcd device 1 has high aperture opening ratio and penetrance.
But, a plurality of pectinations of the pixel electrode 18 of this fringe field switch type lcd device 1 branch into the vertical bar shaped that is parallel to each other, the electric field that itself and public electrode 15 produce is a single direction, liquid crystal molecule also only rotates to single direction, so this fringe field switch type lcd device 1 is single domain (Single Domain) fringe field switch type lcd device.This fringe field switch type lcd device 1 is observed on different visual angles and can be produced colour cast, and promptly the visual angle is narrower, influences display effect.
For solving the narrower problem in above-mentioned single domain fringe field switch type lcd device 1 visual angle, industry proposes another kind of electrode arranging structure.
See also Fig. 3, it is the planar structure synoptic diagram of second substrate 22 of the fringe field switch type lcd device 2 of another kind of prior art.The pixel electrode 250 of this second substrate 22 has a plurality of strip cut 260, these a plurality of otch 260 can be divided into first's otch 261 and second portion otch 262, this first's otch 261 is parallel to each other and is provided with 221 one-tenth one pitch angle of sweep trace, this second portion otch 262 also is parallel to each other and is provided with 221 one-tenth another pitch angle of sweep trace, and the part in the middle of this first's otch 261 and this second portion otch 262 contiguous these pixel electrodes 250 intersects, and forms the bending part of "＜" shape.When voltage puts between this pixel electrode 250 and this public electrode 280, the electric field of this pixel electrode 250 and 280 formation of this public electrode mainly is distributed on the both direction, promptly form two territory electric fields, liquid crystal molecule rotates on this both direction, one pixel cell is divided into two zones, these two zones have different viewing angle characteristics, so this fringe field switch type lcd device 2 is two territories (Two Domain) fringe field switch type lcd devices.This fringe field switch type lcd device 2 can be eliminated the narrower problem in single domain fringe field switch type lcd device 1 visual angle to a certain extent, thereby improves display effect.
But, otch 260 in the middle of the pixel electrode 250 of this pair territory fringe field switch type lcd device 2 is bending shape (i.e. "＜" shape), has sharp-pointed bending place (i.e. the drift angle place of "＜" shape), in this sharp-pointed bending place, direction of an electric field is unusual, the liquid crystal deflecting element at this place is unordered, causes swing offset (Disclination) phenomenon easily, reduces the penetrance and the display effect of this fringe field switch type lcd device 2.
Summary of the invention
In order to overcome the low and narrower problem in visual angle of penetrance that the prior art fringe field switch type lcd device is caused by swing offset, be necessary to provide the higher and viewing angle characteristic of a kind of penetrance fringe field switch type lcd device preferably.
A kind of fringe field switch type lcd device, it comprises one first substrate, one second substrate that is oppositely arranged with this first substrate, an and liquid crystal layer that is sandwiched between this first substrate and this second substrate, multi-strip scanning line and many data lines are set on this second substrate, this multi-strip scanning line and this many data lines insulate to intersect and define a plurality of pixel cells, this pixel cell inner stacks and insulation are provided with public electrode and pixel electrode, this public electrode is plate-like structure, a plurality of otch are set in this pixel electrode at interval, these a plurality of otch are fan-shaped distribution, and each otch and this sweep trace angulation gradually change.
Compared to prior art, the advantage of fringe field switch type lcd device of the present invention is: a plurality of otch that are fan-shaped distribution are set on this pixel electrode at interval, because this otch is spaced apart, avoid this otch to intersect and the generation bending shape, and then the elimination swing offset, improve penetrance.Simultaneously, the otch of fan-shaped distribution has the angle that gradually changes, the direction that electric field is had gradually change, and liquid crystal molecule is arranged along the direction that gradually changes, therefore for multiple domain shows, the viewing angle characteristic of raising all directions.
Description of drawings
Fig. 1 is the structural representation of prior art fringe field switch type lcd device.
Fig. 2 is the planar structure synoptic diagram of second substrate of fringe field switch type lcd device shown in Figure 1.
Fig. 3 is the planar structure synoptic diagram of second substrate of the fringe field switch type lcd device of another kind of prior art.
Fig. 4 is the structural representation of fringe field switch type lcd device first embodiment of the present invention.
Fig. 5 is the planar structure synoptic diagram of second substrate shown in Figure 4.
Fig. 6 is the initial orientation synoptic diagram of liquid crystal molecule in the pixel cell shown in Figure 5.
Fig. 7 is the deflection synoptic diagram of liquid crystal molecule in the pixel cell shown in Figure 5.
Fig. 8 is the graph of a relation of angle, pixel cell penetrance and the pixel cell driving voltage of otch and sweep trace.
Fig. 9 is the second board structure synoptic diagram of fringe field switch type lcd device second embodiment of the present invention.
Embodiment
See also Fig. 4, it is the structural representation of fringe field switch type lcd device first embodiment of the present invention.This fringe field switch type lcd device 3 comprise one first substrate 310, one second substrate 320 that is oppositely arranged and be sandwiched in this first substrate 310 and this second substrate 320 between liquid crystal layer 300, this liquid crystal layer 300 comprises a plurality of liquid crystal molecules 301.
This first substrate 310 is provided with one first polaroid 314 away from the surface of liquid crystal layer 300 1 sides, the surface of this first substrate 310 contiguous these liquid crystal layer 300 1 sides be cascading a colored filter 311 and one first alignment film 312.This second substrate 320 is provided with one second polaroid 325 away from the surface of liquid crystal layer one side, the surface of this second substrate 320 contiguous these liquid crystal layers 300 be cascading a public electrode 321, an insulation course 322, a pixel electrode 323 and one second alignment film 324.
See also Fig. 5, it is the planar structure synoptic diagram of second substrate 320 shown in Figure 4.Many data lines 331 and multi-strip scanning line 332 further are set on this second substrate 320, and these many data lines 331 and 332 insulation of this multi-strip scanning line are intersected to define a plurality of pixel cells (not indicating).This data line 331 is provided with a thin film transistor (TFT) 333 with the intersection of this sweep trace 332, this sweep trace 332 is connected with the grid of this thin film transistor (TFT) 333 to transmit sweep signal, sweep signal is in order to control the switch of this thin film transistor (TFT) 333, this data line 331 is connected with data signal with the source electrode of this thin film transistor (TFT) 333, and the drain electrode of this thin film transistor (TFT) 333 and this pixel electrode 323 electrically connect.This pixel electrode 323 and these public electrode 321 overlaids in each pixel cell, these public electrode 321 integral body are plate-like structure.
This pixel electrode 323 is tabular, and its internal interval is provided with a plurality of otch 350, and these a plurality of otch 350 are fan-shaped and are distributed in this pixel electrode 323, and each otch 350 comprises two parallel bases and two relative waists.These a plurality of otch 350 comprise an isosceles trapezoidal cut 351 and a plurality of inclined ladder shape otch 352, and this isosceles trapezoidal cut 351 is arranged at this pixel electrode 323 center sections, and these a plurality of inclined ladder shape otch 352 are symmetricly set on the both sides of 351 two waists of this isosceles trapezoidal cut.Two bases of this isosceles trapezoidal cut 351 are parallel with this data line 331 respectively, and two waists and this sweep trace 332 of this isosceles trapezoidal cut 351 form an angle.These a plurality of inclined ladder shape otch 352 are symmetricly set on the both sides of 351 two waists of this isosceles trapezoidal cut.Two bases of these a plurality of inclined ladder shape otch 352 are parallel with this data line 331, two waists of these a plurality of inclined ladder shape otch 352 distribute with 332 one-tenth different angles of this sweep trace respectively, this angle is by increasing gradually to both sides in the middle of the pixel electrode 323, promptly the inclined ladder shape otch 352 of contiguous isosceles trapezoid otch 351 is less with the angle of sweep trace 332, increases gradually away from the inclined ladder shape otch 352 of isosceles trapezoid otch 351 and the angle of sweep trace 332.The waist of these a plurality of otch 350 is parallel with the waist of adjacent cut 350 respectively, and has equal spacing between these a plurality of otch 350.
See also Fig. 6, it is the initial orientation synoptic diagram of liquid crystal molecule 301 in the pixel cell shown in Figure 5.The liquid crystal molecule 301 of this pixel cell combines with first polaroid 314 and second polaroid 325 and controls the throughput of light, thereby realizes the control of these fringe field switch type lcd device 3 light and shade states.When there not being voltage to be carried between this pixel electrode 323 and this public electrode 321, liquid crystal molecule 301 is arranged along alignment direction in this liquid crystal layer 300, and light can not pass through liquid crystal layer 300, is shown as dark attitude.
See also Fig. 7, it is the deflection synoptic diagram of liquid crystal molecule 301 in the pixel cell shown in Figure 5.When applying voltage between this pixel electrode 323 and this public electrode 321, produce electric field between this pixel electrode 323 and this public electrode 321, the major axis of this liquid crystal molecule 301 is arranged along direction of an electric field, and this fringe field switch type lcd device 3 is in bright attitude.Because a plurality of otch 350 in this pixel electrode 323 are fan-shaped array, electric field also forms fan-shaped distribution, thereby makes the arrangement of liquid crystal molecule 301 consistent with the electric field arrangement, is fan-shaped distribution.
Because the otch 350 space certain distances of this pixel electrode 323, there is not bending part in each otch 350 each interval, thereby avoids producing the swing offset phenomenon, can effectively improve the penetrance of pixel cell, reduces the dark space; In addition, the otch 350 of this pixel electrode 323 is fan-shaped distribution, has the angle that gradually changes between each otch 350 and this sweep trace 332, electric field is also by the angular distribution that gradually changes, form the multiple domain field, this liquid crystal molecule 301 is along the different directions rotation, so this fringe field switch type lcd device 3 is the multiple domain fringe field switch type lcd device.The display effect of this pixel cell is the summation of all liquid crystal molecule 301 deflecting actions, multiple domain is synthetic jointly, make when observing this fringe field switch type lcd device 3 from different perspectives, can both know and see display image, thereby realize higher image display quality.
See also Fig. 8, it is the graph of a relation of angle, pixel cell penetrance and the pixel cell driving voltage of otch 350 and sweep trace 332.Through experimental verification, the angle of the penetrance of pixel cell and pixel electrode 323 otch 350 has much relations, when showing bright attitude picture, the angle difference of pixel electrode 323 otch 350, the penetrance of pixel cell is also different, it is more little with the angle of this sweep trace 332 to be embodied in this otch 350, and penetrance is big more, and near the variation the penetrance summit is big more with the variation of driving voltage; This otch 350 is big more with the angle of this sweep trace 332, and penetrance is more little, and near the variation the penetrance summit is more little with the variation of driving voltage.In picture shows, not only require the higher penetrating rate but also require bright attitude picture that stable image output is arranged, but in the real work, the normal generation among a small circle of bright attitude picture driving voltage fluctuateed, for guaranteeing picture quality, require bright attitude picture to reduce the image quality reduction that causes because of the driving voltage fluctuation as far as possible, comprehensive foregoing, and it is definite through testing, when the otch 350 of pixel electrode 323 and the angular range between this sweep trace 332 were 0 °-20 °, existing higher penetrating rate can guarantee the stable output of picture again.
See also Fig. 9, it is the structural representation of second substrate 420 of fringe field switch type lcd device second embodiment of the present invention.Fringe field switch type lcd device 3 differences of this fringe field switch type lcd device 4 and first embodiment are: these pixel electrode 423 center sections are provided with two right-angled trapezium otch 451, the setting that keeps at a certain distance away of these two right-angled trapezium otch 451, the right-angle side of these two right-angled trapezium otch 451 is adjacent and be parallel to each other.
Claims (10)
1. fringe field switch type lcd device, it comprises one first substrate, one second substrate that is oppositely arranged with this first substrate, an and liquid crystal layer that is sandwiched between this first substrate and this second substrate, multi-strip scanning line and many data lines are set on this second substrate, this multi-strip scanning line and this many data lines insulate to intersect and define a plurality of pixel cells, this pixel cell inner stacks and insulation are provided with public electrode and pixel electrode, this public electrode is plate-like structure, a plurality of otch are set in this pixel electrode at interval, it is characterized in that: these a plurality of otch are fan-shaped distribution, and each otch and this sweep trace angulation gradually change.
2. fringe field switch type lcd device as claimed in claim 1 is characterized in that: these a plurality of otch comprise an isosceles trapezoidal cut and a plurality of inclined ladder shape otch, and each otch comprises two parallel bases and two relative waists.
3. fringe field switch type lcd device as claimed in claim 2 is characterized in that: this isosceles trapezoidal cut is positioned in the middle of this pixel electrode.
4. fringe field switch type lcd device as claimed in claim 3 is characterized in that: trapezoidal two bases of these isosceles are parallel with this data line, and trapezoidal two waists and this sweep trace of these isosceles forms an angle.
5. fringe field switch type lcd device as claimed in claim 3 is characterized in that: these a plurality of inclined ladder shape otch are symmetrically distributed in this isosceles trapezoidal cut both sides.
6. fringe field switch type lcd device as claimed in claim 1 is characterized in that: these a plurality of otch comprise two right-angled trapezium otch and a plurality of inclined ladder shape otch.
7. fringe field switch type lcd device as claimed in claim 6 is characterized in that: these two right-angled trapezium otch are positioned in the middle of this pixel electrode, and two right-angle sides of these two right-angled trapezium are adjacent and parallel.
8. fringe field switch type lcd device as claimed in claim 7 is characterized in that: these a plurality of inclined ladder shape otch are symmetrically distributed in this two right-angled trapezium both sides, and the base of these a plurality of inclined ladder shape otch is parallel with this data line.
9. as claim 5 or 8 described fringe field switch type lcd devices, it is characterized in that: the waist of these a plurality of inclined ladder shape otch has angle with sweep trace respectively, and this angle is with this otch and trapezoidal distance increase and the increase gradually of this isosceles.
10. fringe field switch type lcd device as claimed in claim 9 is characterized in that: the scope of this angle is 0 °-20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101577083A CN100573285C (en) | 2006-12-20 | 2006-12-20 | Fringe field switch type LCD device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101577083A CN100573285C (en) | 2006-12-20 | 2006-12-20 | Fringe field switch type LCD device |
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| Publication Number | Publication Date |
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| CN101206353A true CN101206353A (en) | 2008-06-25 |
| CN100573285C CN100573285C (en) | 2009-12-23 |
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| CNB2006101577083A Expired - Fee Related CN100573285C (en) | 2006-12-20 | 2006-12-20 | Fringe field switch type LCD device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926753A (en) * | 2013-10-18 | 2014-07-16 | 厦门天马微电子有限公司 | TFT (thin film transistor) array substrate and display panel |
| CN110673406A (en) * | 2019-09-17 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Liquid crystal display panel with switchable viewing angle and driving method thereof |
| CN111627332A (en) * | 2020-05-20 | 2020-09-04 | 武汉华星光电半导体显示技术有限公司 | Display substrate, display panel and display panel manufacturing method |
| WO2021261054A1 (en) * | 2020-06-22 | 2021-12-30 | 株式会社ジャパンディスプレイ | Polarization conversion element |
-
2006
- 2006-12-20 CN CNB2006101577083A patent/CN100573285C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926753A (en) * | 2013-10-18 | 2014-07-16 | 厦门天马微电子有限公司 | TFT (thin film transistor) array substrate and display panel |
| CN103926753B (en) * | 2013-10-18 | 2017-05-03 | 厦门天马微电子有限公司 | TFT (thin film transistor) array substrate and display panel |
| CN110673406A (en) * | 2019-09-17 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Liquid crystal display panel with switchable viewing angle and driving method thereof |
| CN111627332A (en) * | 2020-05-20 | 2020-09-04 | 武汉华星光电半导体显示技术有限公司 | Display substrate, display panel and display panel manufacturing method |
| WO2021261054A1 (en) * | 2020-06-22 | 2021-12-30 | 株式会社ジャパンディスプレイ | Polarization conversion element |
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| Publication number | Publication date |
|---|---|
| CN100573285C (en) | 2009-12-23 |
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Granted publication date: 20091223 Termination date: 20191220 |