CN102436097A - Liquid crystal display - Google Patents
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- CN102436097A CN102436097A CN2011104150998A CN201110415099A CN102436097A CN 102436097 A CN102436097 A CN 102436097A CN 2011104150998 A CN2011104150998 A CN 2011104150998A CN 201110415099 A CN201110415099 A CN 201110415099A CN 102436097 A CN102436097 A CN 102436097A
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Abstract
The invention discloses a liquid crystal display. The liquid crystal display comprises a first substrate and a second substrate, wherein the first substrate and the second substrate are performed vertical alignment process; a liquid crystal layer is clamped between the first substrate and the second substrate; the liquid crystal layer comprises liquid crystal molecules which are roughly vertical to the main surface of the first substrate when a rough non-electric field is applied to the liquid crystal layer; a plurality of gate lines and data lines are arranged on the second substrate; the gate lines and the data lines are assembled to form a plurality of matrix-arranged pixel areas; each pixel area is defined by two adjacent gate lines and two adjacent data lines; a plurality of pixel electrodes are arranged in the pixel areas; the pixel electrodes are provided with a first edge adjacent to the gate lines and a second edge adjacent to the data lines respectively; a plurality of protruding parts which are in an array arrangement are arranged on the first substrate; a plurality of narrow gaps which are in an array arrangement are arranged on the pixel electrodes; and the gaps and the protruding parts are mutually staggered and arranged.
Description
The explanation of dividing an application
The application's application number that to be the applicant propose on September 19th, 2005 is dividing an application of 200510106385.0 patented claim " LCD ".
Technical field
The present invention relates to a kind of LCD (Liquid Crystal Display), relate in particular to a kind of multiregional vertical align type (Multi-domain Vertically Aligned, MVA) LCD.
Background technology
LCD mainly comprises a LCD unit, and to have two glass substrates opposite each other and a liquid crystal layer is located in therebetween.(Vertical Aligned, VA) the type LCD is a kind of type (mode) of using negative type liquid crystal material and vertical orientation film to vertical orientation.When no-voltage was supplied, Liquid Crystal Molecules Alignment occurred blank screen demonstration (black display) in a vertical direction because of incident ray can't penetrate this LCD unit.When supplying with a predefined voltage, Liquid Crystal Molecules Alignment occurs white screen display (white display) in a horizontal direction because of incident ray can penetrate this LCD unit.
Yet when viewing angle was not the normal to screen plane, this vertical alignment type liquid crystal display device had the problem that contrast descends or contrast is reversed (contrast reversal).This is the interactive result of liquid crystal molecule in light and the LCD unit.When light with non-perpendicular incident angle when the LCD unit, it is different from when light with the interactive mode of liquid crystal molecule and passes through LCD unit with vertical incident angle.Therefore, penetrate at light and obviously to descend when state (in vain) and non-penetrates contrast between the state (deceiving) at non-perpendicular angle, thereby make these displays all can't be satisfactory in many application (for example flat-surface television screen and giant brain screen).
The field-of-view angle of known multi-region vertical nematic LCD (viewing angle) performance can be set at a plurality of different each other directions through the orientation (orientation) with liquid crystal molecule in the pixel and improves.European patent is announced multiregional vertical align type of 0884626-A2 number announcement, and (it has a plurality of zone adjustment members in order to improve the performance of its field-of-view angle for multi-domain vertically aligned, MVA) LCD.Typically; Adjustment member in this zone is through establishing a plurality of projections (protrusion) and realize wherein these projections and slit arrangement interlaced with each other establishing on the pixel electrode of thin film transistor base plate on a plurality of slits (slit) and the common electrode at colored optical filtering substrates.And the orientation of the arrangement of liquid crystal molecule is to be determined by the limit field effect (fringe field) of projection (protrusion) with pattern (pattern) generation of slit (slit).
In the driving of foregoing liquid crystal display; It must make in each pixel (pixel) pairing liquid crystal molecule rotate (rotation) through impressed voltage; And change the transmittance of each pixel through the rotation of liquid crystal molecule, so this LCD can show different brightness (brightness) for the rotation that adapts to liquid crystal molecule.
For most LCD, fixedly the time, when impressed voltage was high more, the reaction time can be fast more at initial voltage, yet, for some LCDs, and not exclusively be suitable for.
For example, what delivered in SID in 2004 " DCCII:Novel Method for Fast Response in PVA Mode " promptly point out in the literary composition, with patterning vertical orientation (Patterned Vertical Alignment; PVA) be the LCD of display mode, under certain conditions, when adding a high voltage, the reaction time is slow more on the contrary.Similarly situation also occurs in the LCD of multiregional vertical align as display mode.
Fig. 9 A shows traditional multi-domain vertical alignment liquid crystal displays at the projection of pixel region and the arrangement plan of slit, and Fig. 9 B displayed map 9A is along the sectional view of A-A line.Please scheme with reference to 9A earlier; The pixel region 400 of LCD is to utilize a brake cable road 402 and a data line 404 to intersect and define; Pixel region 400 has a thin film transistor (TFT) 406 and is connected with brake cable road 402, data line 404, and disposes a pixel electrode 408 that is connected with thin film transistor (TFT) 406.Please refer again to 9B figure, the projection 410 that is disposed at pixel region 400 is respectively formed at colored filter substrate 414 and thin film transistor base plate 416 with slit 412.Wherein, The configuration of projection 410 and slit 412 makes the orientation of liquid crystal molecule and the penetrating shaft of Polarizer (not shown) up and down all be miter angle; Make light the time through multi-domain vertical alignment liquid crystal displays; Must present maximum GTG brightness, in case and liquid crystal molecule and Polarizer (not shown) up and down under the adjusting (regulate) of projection 410 and slit 412, still can't be the miter angle orientation time claim that promptly the arrangement of liquid crystal molecule produces unusual; Can't present maximum gray brightness when passing through LCD when light this moment.
The liquid crystal molecule in Figure 10 A to Figure 10 E simulation drawing 9A zone 418 is in identical observing time; (switching) arranged in the rotation that the limit field effect that produces because of the pattern (pattern) of projection (protrusion) and slit (slit) under the different impressed voltages causes, wherein the transverse axis of 10A-10E figure and the longitudinal axis A-A and the A-B direction that correspond to Fig. 9 A respectively.Shown in Figure 10 A and Figure 10 B, when impressed voltage during respectively at 5V and 5.5V, the liquid crystal molecule in zone 418 is the results that present normal alignment according to the assortment of limit field effect; Yet; Shown in Figure 10 C to Figure 10 E; When impressed voltage increases to 5.75V, 6.0V and 6.5V; Part liquid crystal molecule 420a, 420b in the zone 418 do not receive the assortment of limit field effect and present unusual arrangement (disclination), and the part liquid crystal molecule 420a that is especially shown like Figure 10 E, 420b arrange the most serious unusually.
Know at present; Causing one of unusual possible cause of multiple domain vertical liquid crystal molecules align is when projection 410 becomes big with slit 412 distances; Projection 410 need expend with slit 412 middle liquid crystal molecule 420a, 420b, and the time of length just is able to the assortment along with contiguous lqiuid crystal molecule tipping (tilt); So not only make the reaction time of liquid crystal molecule increase, add a little less than the liquid crystal molecule suffered limit field effect of projection 410 and slit 412 centres, and the vertical electric field that applies possibly make the multiple domain vertical liquid crystal with under the situation that direction is toppled over arbitrarily; Make toppling direction uncontrolled, and cause unusual arrangement.
In addition; The unusual origin cause of formation of arranging also possibly apply high voltage because of moment; Before the assortment, the vertical electric field that is applied earlier influences projection 410 not receiving contiguous toppling over of liquid crystal molecule as yet with slit 412 middle liquid crystal molecule 420a, 420b, and liquid crystal is toppled over any direction; And do not receive under the situation of limit field effect control at toppling direction; The unusual arrangement also thereby generation caused shown in Figure 10 C to Figure 10 E, and projection 410 is arranged with slit 412 middle liquid crystal molecule 420a, 420b unusually; And unusual liquid crystal molecule 420a, the 420b that arranges will present dim spot (gray spot) or stain (black spot) 420a, 420b among Figure 10 E under observation by light microscope, shown in the 11st schemes.
Above-mentioned ash is selected or the generation of stain is that the liquid crystal molecule of toppling over because of any direction is not due to the miter angle orientation with the penetrating shaft of polaroid up and down; The unusual liquid crystal molecule of arranging possibly receive subsequently influence and the desire of contiguous liquid crystal molecule heavily fall (retilt) return when the polaroid penetrating shaft becomes the correct angle of miter angle up and down; Then need spend the longer time; Therefore cause the reaction time to increase; Especially bad, when the drive of contiguous liquid crystal molecule can't make the liquid crystal molecule of unusual arrangement heavily fall, liquid crystal molecule will present grey point or stain and can't recover the brightness that this has.
Hence one can see that has a critical voltage at multi-region vertical nematic LCD when driving;, impressed voltage will produce the problem that the foregoing liquid crystal molecule abnormality is arranged when surpassing this critical voltage; Can not surpass this critical voltage so in the traditional monitor design, must limit the driving bias voltage, in order to avoid cause the increase in reaction time.And in the traditional monitor design, the spacing of projection and slit also needs to avoid unusual arrangement problems less than to a certain degree, can improve critical voltage value to increase the spendable scope of driving voltage with this.But because the pitch smaller of projection and slit; Cause projection set in the single pixel and slot number to increase; And projection and slit are all can not control the zone that liquid crystal carries out normal running; Thereby cause the aperture opening ratio (aperture ratio) of pixel region to reduce, cause the brightness of LCD to descend.
The multi-region vertical nematic LCD that is disclosed at U.S. publication US2002/0159018; Its pixel electrode has more jagged recess (jagged) at the slit place; Can accelerate the reaction time of liquid crystal, though can therefore slightly increase the spacing of projection and slit, the unusual problem of arranging of liquid crystal molecule also can't be got rid of fully; Must maintain below the certain value so its spacing is still, make that the increase degree of aperture opening ratio is limited.
Summary of the invention
One of fundamental purpose of the present invention provides a kind of multi-region vertical nematic LCD of high aperture, and it can overcome or improve at least the problem of aforementioned background art.
According to LCD of the present invention; It mainly comprises first substrate and second substrate of handling through vertical orientation; A liquid crystal layer is located between this first and second substrate, and is located at first member and second member on this first substrate and second substrate respectively.The liquid crystal molecule that this liquid crystal layer comprised is not roughly having the main surface that is approximately perpendicular to this first substrate when electric field puts on this liquid crystal layer.This first member and second member make that in order to the orientation (orientation) of adjusting this liquid crystal layer this liquid crystal molecule is tilted orientation and makes this orientation comprise a plurality of directions when voltage applies.
Aforesaid first member can be realized through the projection of a plurality of arrayed being located at this first substrate, and aforesaid second member can be realized through the slit of a plurality of arrayed is located at pixel electrode.In addition; Also can following structures realize according to first member of the present invention and second member: for example first member is for slit (for example being located on the common electrode of this first substrate) collocation second member is the structure of projection (being located on this second substrate), or first member and second member are all projection or are all the structure of slit.This first member and second member are parallel haply and be staggered.
When adopting the applicant when the driving method that is disclosed is invented in No. 93123879 patented claim of TaiWan, China of application on August 20th, 2004, (partial) spacing of the part between this first member and second member can be designed to more than or equal to 25 μ m the unusual problem of liquid crystal arrangement not to take place.Aforementioned driving method mainly is to make the driving voltage of pixel break through the restriction of critical voltage value (initial voltage value adds critical bias) with the mode that bias voltage is provided stage by stage, and reaches higher target voltage values.
Aforesaid slit is preferable to be provided with a plurality of jagged recesses that are arranged in.Inventor back after deliberation finds when use aforementionedly so that the driving method of bias voltage to be provided stage by stage, and (partial) spacing that these projections and these are provided with the part between the slit of recess can be designed to 30 μ m to 50 μ m and the unusual problem of liquid crystal arrangement can not take place.
In aforesaid multi-region vertical nematic LCD; Because projection and slit can be configured to have bigger spacing; Therefore effectively reduce the distribution density of these projections and slit, effectively increase aperture opening ratio (aperture ratio) (also getting final product the ratio of transmission region) by this and make the brightness of LCD promote.
Each projection is preferably and is provided with a plurality of branched portions (branch), and these branched portions are located at over against the position at the edge of these pixel electrodes.Each pixel electrode is separated into a plurality of partial electrodes by these slits, and per two adjacent partial electrodes are bonded together by a connecting portion.Each connecting portion has one first part and a second portion; The bearing of trend of this first part is approximately perpendicular to the bearing of trend of these projections; The bearing of trend of this second portion is roughly parallel to these data circuits, and wherein the second portion of each connecting portion branched portion complete and this projection is overlapping.
Preferable a plurality of " H " shape capacitance electrode that comprises in addition of aforesaid LCD is located at corresponding pixel region respectively.This capacitance electrode has through interconnected two side sections of central part.Two side sections of this of each capacitance electrode are located at the position of proximity data circuit in the corresponding pixel region respectively.These capacitance electrodes and these pixel electrodes form a storage capacitors unit.
Description of drawings
In order to let above-mentioned and other purposes of the present invention, characteristic and the advantage can be more obvious, hereinafter is special lifts the embodiment of the invention, and cooperates appended diagram, elaborates as follows.
Fig. 1 to Fig. 4: it is in order to multi-region vertical nematic LCD according to an embodiment of the invention to be described;
Fig. 5: the partial plan of the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention;
Fig. 6: the planimetric map of the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention;
Fig. 7: the planimetric map of the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention;
Fig. 8: the part cut-away view of the vertical alignment type liquid crystal display device of a preferred embodiment according to the present invention;
Fig. 9 A: traditional multi-domain vertical alignment liquid crystal displays is in the projection of pixel region and the arrangement plan of slit;
Fig. 9 B: the LCD of Fig. 9 A is along the sectional view of A-A line;
Figure 10 A to Figure 10 E: it is that the liquid crystal molecule in simulation drawing 9A zone 418 is in identical observing time; The synoptic diagram of the rotation arrangement (switching) that the limit field effect that produces because of projection and slit pattern under the different impressed voltages causes, wherein the transverse axis of Figure 10 A-10E and the longitudinal axis correspond to A-A and the A-B direction of Fig. 9 A respectively; And
The observations of liquid crystal molecule under optical microscope shown in Figure 11: the 10E figure.
The figure number explanation:
Embodiment
Though the present invention can show as multi-form embodiment; But reaching in hereinafter explaining shown in the accompanying drawing is embodiments of the invention; And please understand person disclosed herein for an example of the present invention, and be not that intention is in order to be limited to the present invention in diagram and/or the described specific embodiment.
The present invention is relevant for a kind of multi-region vertical nematic LCD; It mainly comprises first substrate and second substrate of handling through vertical orientation; A liquid crystal layer is located between this first and second substrate, and is located at first member and second member on this first substrate and second substrate respectively.The liquid crystal molecule that this liquid crystal layer comprised is not roughly having the main surface that is approximately perpendicular to this first substrate when electric field puts on this liquid crystal layer.This first member and second member make that in order to the orientation (orientation) of adjusting liquid crystal molecule in this liquid crystal layer this liquid crystal molecule is tilted orientation and makes this orientation comprise a plurality of directions when voltage applies.Therefore, according to the performance of the field-of-view angle of multi-region vertical nematic LCD of the present invention, can be set at a plurality of different each other directions through orientation (orientation) and improve liquid crystal molecule in the pixel.
LCD of the present invention for example is a kind of Thin Film Transistor-LCD (Thin film transistor liquid crystal display; TFT LCD).With reference to Fig. 8, first substrate 102 can be provided with a light and cover for example light shield layer (BM) (not being shown among Fig. 8) of array; A plurality of colored filter 102a and a common electrode 102b.
Shown in Figure 1 for being arranged on the pixel portion of aforesaid second substrate 104 (104 are not shown in Fig. 1) according to an embodiment of the invention, wherein be provided with many parallel brake cable roads (gate line) 106; Many parallel data circuits (data line) 108, it is perpendicular to this brake cable road 106; And a plurality of thin film transistor (TFT)s 109 and pixel electrode 120.This thin film transistor (TFT) 109 and pixel electrode 120 general one-tenth matrix forms are arranged in the cross section of this brake cable road 106 and data circuit 108.Generally speaking, this first substrate 102 is because it is provided with colored filter and can be described as colored optical filtering substrates, and this second substrate 104 can be described as thin film transistor base plate.First substrate 102 and 104 of second substrates generally are provided with distance piece (spacer) (not being shown among the figure) in order to define the interval (gap) between this substrate.
Referring to Fig. 1, pixel electrode 120 is located in the pixel region that is defined by two adjacent brake cable roads 106 and two adjacent data circuits 108.In this embodiment, aforesaid first member is for example realized through the projection 130 of a plurality of arrayed is located at this first substrate, and aforesaid second member is for example realized through the slit 140 of a plurality of arrayed is located at pixel electrode 120.Projection 130 and slit 140 are parallel haply and be staggered.
Referring to Fig. 1, each slit 140 is provided with a plurality of jagged recess (jagged) 140a that are arranged in.Two adjacent projections 130 and the spacing between the slit 140 are denoted as c, and this spacing c minimum-depth a of equaling these recesses 140a adds these recesses 140a with minimum-depth and the distance b between the projection 130.When these slits 140 are not provided with these recesses 140a and use conventional ADS driving method LCD; Spacing c between these projections 130 and these slits 140 needs less than 25 μ m, increases or makes display frame produce the problem of image delay (image retention) otherwise be positioned at reaction time that adjacent protrusions and liquid crystal molecule in the middle of the folded zone of slit be easy to occur the unusual situation of arranging of liquid crystal molecule because the instantaneous variation (bias voltage) of driving voltage is excessive and cause pixel.
When adopting the applicant to invent the driving method that is disclosed in No. 93123879 patented claim of TaiWan, China of 8 months 20 days year in 2004 application; Make the driving voltage of pixel break through the restriction of critical voltage value (initial voltage value adds critical bias) with the mode that bias voltage is provided stage by stage, and reach higher target voltage values.Specifically, aforementioned driving method provides first bias voltage less than critical bias when picture frame time t1, make original initial voltage value after adding first bias voltage, rise to an intermediate voltage value.Then, when picture frame time t2, one second bias voltage is provided again, makes driving voltage further rise to target voltage values by intermediate voltage value.Because this driving method can be broken through the restriction of critical voltage to solve the problem that the foregoing liquid crystal molecule abnormality is arranged; Thereby the spacing c between these projections 130 and these slits 140 does not need to be limited in less than 25 μ m again; (partial) spacing of part can be designed as more than or equal to 25 μ m, and the unusual problem of liquid crystal arrangement can not take place.
Because the spacing c between these projections 130 and these slits 140 can be designed as more than or equal to 25 μ m; Thereby the number of the projection 130 of single pixel region and slit 140 can reduce; Effectively increase aperture opening ratio by this, and the display quality of brightness is significantly promoted.
In addition; When these slits 140 are provided with these recesses 140a and LCD use conventional ADS driving method; Because the reaction time is very fast, so the spacing c between these projections 130 and these slits 140 generally is designed to less than 30 μ m to avoid taking place the unusual problem of liquid crystal arrangement.Relatively; Inventor back after deliberation finds when using aforementionedly so that the driving method of bias voltage to be provided stage by stage, and (partial) spacing c that these projections 130 and these are provided with between the slit 140 of recess 140a partly can be designed to more than or equal to 30 μ m the unusual problem of liquid crystal arrangement not to take place.
In addition, when these slits 140 were provided with these recesses 140a, the spacing c between these projections 130 and these slits 140 can be designed to 50 μ m at most and the unusual problem of liquid crystal arrangement can not take place.
The inventor studies the spacing d of these recesses 140a and the relation between width e (referring to the 2nd figure) and the penetrance (transmittance) in addition, shown in its result such as the following table one (spacing c is set at 35 μ m, and minimum-depth a is set at 14 μ m).
Table one
| d(μm) | e(μm) | Transmittance | d/(d+e) | (d+e) |
| 4.5 | 2.5 | ◎ | 64.3％ | 7.0 |
| 4 | 3 | ◎ | 57.1％ | 7.0 |
| 3.75 | 3.25 | ◎ | 53.6％ | 7.0 |
| 4 | 3.5 | ○ | 53.3％ | 7.5 |
| 4 | 4 | ○ | 50.0％ | 8.0 |
| 4.5 | 4 | ○ | 52.9％ | 8.5 |
| 5 | 4 | ○ | 55.6％ | 9.0 |
◎ excellent zero: good
Can know that by table one these recesses 140a preferred configuration becomes its spacing d and width e addition to equal 7～9 μ m, all can obtain good penetrance.
The inventor studies spacing d and the width e (referring to the 2nd figure) of these recesses 140a and in addition with the relation between the resulting reaction time of conventional ADS driving method (response time); Shown in its result such as the following table two (spacing c is set at 35 μ m, and minimum-depth a is set at 14 μ m).
Table two
| d(μm) | e(μm) | Reaction time |
| 4.5 | 2.5 | ○ |
| 4 | 3 | ◎ |
| 3.75 | 3.25 | ◎ |
| 4 | 3.5 | ◎ |
| 4 | 4 | ◎ |
| 4.5 | 4 | ◎ |
| 5 | 4 | △ |
◎: excellent zero: good △: bad
Can know that by table two the spacing d preferred configuration of these recesses 140a becomes to be not more than 4.5 μ m, and the width e preferred configuration of these recesses 140a becomes to be not less than 3 μ m, obtain the preferable reaction time by this.
Further consider penetrance and reaction time two factors simultaneously and can know that these recesses 140a preferred configuration becomes its spacing d and width e addition to equal 7～8.5 μ m.
Shown in Figure 3 is the pixel portion of multi-region vertical nematic LCD according to another embodiment of the present invention; Its preferable being provided with of each pixel region " H " the shape capacitance electrode (storage capacitance electrode) 150 of illustrative LCD, capacitance electrode 150 has two side sections 150a and connects mutually through a central part 150b.As shown in Figure 3, two side sections 150a of this capacitance electrode 150 are located at the position of proximity data circuit 108 in the pixel region.Capacitance electrode with respect to conventional liquid crystal generally is designed to only have aforesaid central part 150b, and two the side sections 150a and the pixel electrode 120 overlaid places of this capacitance electrode 150 can provide additional storing electric capacity.This capacitance electrode 150 generally is to be formed by a lock metal layer patternization with brake cable road 106 and gate electrode.Therefore, in Fig. 3, this capacitance electrode 150 is understood with help with shadow representation with brake cable road 106.Because the lock metal level generally is with for example aluminium (aluminum), chromium (chromium), tantalum (tantalum) or molybdenum (molybdenum) formation of lighttight conducting metal, so two side sections 150a of this capacitance electrode 150 can be used as a fill-in light shielding layer and are used for covering light leak.
Fig. 1 each projection 130 of illustrative LCD have a plurality of branched portion 130a and be located at over against the position at the edge of pixel electrode 120.Because the major axis of liquid crystal molecule can be arranged along the vertical direction of branched portion 130a and slit 140; Therefore the angle of this branched portion 130a and slit 140 is remained on and be less than or equal to 45 degree, make near the orientation difference of major axis of the liquid crystal molecule branched portion 130a and slit 140 boundaries significantly be reduced to maximum 45 by this and spend.This effective unusual arrangement of inhibition (disclination) occurs in the adjacent domain of the boundary, edge of slit 140 and pixel electrode 120.Yet because projection 130 and pixel electrode 120 are respectively formed on the different substrate; Therefore the bit errors between different substrate usually can cause branched portion 130a can't accurately be located at over against the edge of pixel electrode 120, causes the unusual deepening zone of arranging of liquid crystal molecule to appear at the adjacent domain of slit 140 and boundary, pixel electrode edge on the contrary.
Like Fig. 1 and shown in Figure 4, this pixel electrode 120 is separated into four partial electrode 120A, 120B, 120C and 120D by these slits 140.Per two adjacent partial electrodes are at least a connecting portion 122 and are bonded together.Each connecting portion 122 has one first partly a 122a and a second portion 122b (referring to Fig. 4); The bearing of trend of this first part 122a is perpendicular to the bearing of trend of these projections 130, and the bearing of trend of this second portion 122b is parallel to these data circuits 108.In this embodiment, the second portion 122b of each connecting portion 122 fully not overlapping (also i.e. the complete vertical projection of this second portion 122b and this branched portion 130a identical zone on base plan) with the branched portion 130a of this projection 130.The back after deliberation situation of finding can not appear deepening (darkened) of inventor with this branched portion 130a overlapping areas at aforementioned second portion 122b.And in this presented dark zone, it had found that the orientation of liquid crystal molecule changes very slowly when imposing voltage.This will reduce contrast and reaction time, thereby display quality is worsened.And if the two substrates contraposition produces error, make this second portion 122b and this branched portion 130a produce dislocation and together underlapped, its dislocation zone also can produce the situation of deepening.
Shown in Figure 5 is the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention.Except the second portion 122b of each connecting portion 122 overlapping with the branched portion 130a of this projection 130 fully (also i.e. this second portion 122b and this branched portion 130a vertical projection in zone identical on the base plan), LCD shown in Figure 5 is roughly identical with Fig. 1 and LCD shown in Figure 4.Inventor's design of this embodiment of back discovery after deliberation can effectively dwindle the aforementioned zone that presents deepening.And when two substrates was created in that the contraposition of above-below direction is unusual among Fig. 5, so design also can effectively reduce the zone that produces deepening.
Shown in Figure 6 is the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention.In this embodiment, aforesaid first member is realized through the projection 230 of a plurality of arrayed is located at this first substrate, and aforesaid second member is realized through the slit 240 of a plurality of arrayed is located at this pixel electrode 220.The arrangement interlaced with each other haply of these projections 230 and these slits 240, the slit 240 that wherein is located in two adjacent protrusions 230 is bent into " it " font.As shown in the figure, this pixel electrode 220 is separated into three partial electrode 220A, 220B and 220C by these slits 240.Per two adjacent partial electrodes are at least a junction and are bonded together.These partial electrodes 220A, 220B and 220C respectively have a plurality of teats 224, and the bearing of trend of these teats 224 is perpendicular to the bearing of trend of these projections 230.It should be noted that these projections 230 be not provided with the branched portion (branch) of any panel data circuit over against this pixel electrode near the position at the edge of data circuit, so can effectively reduce the deepening zone that the branched portion bit errors is caused.
Shown in Figure 7 is the pixel portion of multi-region vertical nematic LCD in accordance with another embodiment of the present invention.Compared to Fig. 1-6 illustrative multi-region vertical nematic LCD; Display shown in Figure 7 only is provided with second member that the slit 340 by a plurality of arrayed is constituted, and can not reach the purpose of improving the field-of-view angle performance and do not need at first substrate aforesaid first member to be set.As shown in the figure, this pixel electrode 320 has a cruciform main body (cross-shaped main body) 320a and a plurality of teat 320b is extended by this cruciform main body 320a.In display shown in Figure 7; Each pixel comprises four zones (domain) A, B, C and D; The orientation of liquid crystal molecule wherein (orientation) is set to four different each other directions respectively, effectively improves the field-of-view angle performance of LCD by this.
In LCD shown in Figure 7, each pixel region is preferable to be provided with a capacitance electrode 350 with a cruciform central part 350a and two side sections 350b.This cruciform central part 350a roughly is formed on over against the position of this cruciform main body 320a of this pixel electrode 320.These two side sections 350b connect mutually through this cruciform central part 350a, and these two side sections 350b are located at the position of proximity data circuit 108 in the pixel region respectively.Generally be designed to only have the lateral part of aforesaid cruciform central part 350a with respect to the capacitance electrode of conventional liquid crystal, the longitudinal component of the central part 350a of this capacitance electrode 350 and two side sections 350b can provide additional storing electric capacity.This capacitance electrode 350 is generally formed by a lock metal layer patternization with brake cable road 106 and gate electrode.Therefore, in Fig. 7, this capacitance electrode 350 is understood with help with shadow representation with brake cable road 106.Since the lock metal level generally be with lighttight conducting metal for example aluminium, chromium, tantalum or molybdenum form, so the longitudinal component of the central part 350a of this capacitance electrode 350 and two side sections 350b can be used as a fill-in light shielding layer and are used for covering light leak.
Though in the display shown in Fig. 1-6; This first member is realized through the projection of a plurality of arrayed being located at this first substrate; And second member is realized through the slit of a plurality of arrayed is located at this pixel electrode, yet also can following structures be realized according to first member of the present invention and second member.For example first member is that slit (for example being located on the common electrode of this first substrate) collocation second member is the structure of projection (being located on this second substrate), or first member and second member are all projection or are all the structure of slit.Then, narrate as follows in order to the processing procedure that forms these projections.When these projections will be formed on colored optical filtering substrates, earlier a photoresistance is coated the colored optical filtering substrates surface, shift one and preestablish pattern (with reference to the projection pattern shown in Fig. 1-7), develop then and form these projections.This processing procedure can be implemented through conventional art easily.In addition, these slits conventional pixel electrode capable of using forms step and forms with pixel electrode.
Though the present invention discloses with previous embodiment, so it is not that any those of ordinary skills are not breaking away from the spirit and scope of the present invention, when doing various changes and modification in order to qualification the present invention.Therefore protection scope of the present invention is as the criterion when looking the accompanying Claim scope person of defining.
Claims (7)
1. LCD, it comprises:
First substrate and second substrate through the vertical orientation processing;
A liquid crystal layer is located between said first and second substrate, and said liquid crystal layer comprises the liquid crystal molecule that is approximately perpendicular to the main surface of said first substrate when electric field puts on said liquid crystal layer when roughly not having;
Many brake cable roads and data circuit are located on said second substrate, and said brake cable road and data circuit are configured to form the pixel region of a plurality of arranged, and said each pixel region is to be defined by two adjacent brake cable roads and two adjacent data circuits;
A plurality of pixel electrodes are located at said pixel region, and said pixel electrode has near first limit on brake cable road and near second limit of data circuit;
The projection of a plurality of arrayed is located at said first substrate; And
The slit of a plurality of arrayed is located at said pixel electrode, said slit and the arrangement interlaced with each other of said projection, and the slit that wherein is located in two adjacent protrusions is bent into " it " font;
Each said pixel electrode is separated into a plurality of partial electrodes by said slit, and each said partial electrode has a plurality of teats, and the bearing of trend of said teat is perpendicular to the bearing of trend of said projection;
Said projection is not provided with any branched portion in the position over against said pixel electrode second limit.
2. LCD, it comprises:
First substrate and second substrate through the vertical orientation processing;
A liquid crystal layer is located between said first and second substrate, and said liquid crystal layer comprises the liquid crystal molecule that is approximately perpendicular to the main surface of said first substrate when electric field puts on said liquid crystal layer when roughly not having;
Many brake cable roads and data circuit are located on said second substrate, and said brake cable road and data circuit are configured to form the pixel region of a plurality of arranged, and said each pixel region is defined by two adjacent brake cable roads and two adjacent data circuits;
A plurality of pixel electrodes are located at said pixel region;
The slit of a plurality of arrayed is located at said pixel electrode makes each said pixel electrode have a cruciform main body and a plurality of teat is extended by said cruciform main body; And
A plurality of capacitance electrodes are located at corresponding pixel region respectively; Each said capacitance electrode has a cruciform central part and two side sections; Said cruciform central part roughly is formed on over against the position of the said cruciform main body of respective pixel electrode; Said two side sections connect mutually through said cruciform central part, and said two side sections are located at the position of proximity data circuit in the corresponding pixel region respectively
Wherein said capacitance electrode and said pixel electrode form a storage capacitors unit.
3. LCD, it comprises:
First substrate and second substrate through the vertical orientation processing;
A liquid crystal layer is located between said first and second substrate, and said liquid crystal layer comprises the liquid crystal molecule that is approximately perpendicular to the main surface of said first substrate when electric field puts on said liquid crystal layer when roughly not having;
Many brake cable roads and data circuit are located on said second substrate, and said brake cable road and data circuit are configured to form the pixel region of a plurality of arranged, and said each pixel region is defined by two adjacent brake cable roads and two adjacent data circuits;
A plurality of pixel electrodes are located at said pixel region;
First member and second member are located at respectively on said first substrate and second substrate in order to the orientation of adjusting said liquid crystal layer and are made that said liquid crystal molecule is tilted orientation and makes said orientation comprise a plurality of directions when voltage applies, and said first member and second member are parallel haply and be staggered;
Many capacitance electrode lines are arranged between two said brake cable roads, form a storage capacitors unit with said pixel electrode; And
At least one conductor lines is arranged between said pixel electrode and the corresponding said data circuit, and said conductor lines and said pixel electrode part are overlapping, and are one of the forming with said capacitance electrode line.
4. LCD according to claim 3, the projection that wherein said first member comprises a plurality of arrayed is located at said first substrate, and the projection that said second member comprises a plurality of arrayed is located at said second substrate.
5. LCD according to claim 3, the projection that wherein said first member comprises a plurality of arrayed is located at said first substrate, and the slit that said second member comprises a plurality of arrayed is located at said pixel electrode.
6. LCD according to claim 3, the slit that wherein said first member comprises a plurality of arrayed is located at said first substrate, and the projection that said second member comprises a plurality of arrayed is located at said second substrate.
7. LCD according to claim 3, the slit that wherein said first member comprises a plurality of arrayed is located at said first substrate, and the slit that said second member comprises a plurality of arrayed is located at said pixel electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104150998A CN102436097A (en) | 2005-09-19 | 2005-09-19 | Liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104150998A CN102436097A (en) | 2005-09-19 | 2005-09-19 | Liquid crystal display |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101063850A Division CN1936677B (en) | 2005-09-19 | 2005-09-19 | Liquid crystal display |
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| CN102436097A true CN102436097A (en) | 2012-05-02 |
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| CN2011104150998A Pending CN102436097A (en) | 2005-09-19 | 2005-09-19 | Liquid crystal display |
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