CN101162340B - Pixel structure - Google Patents
Pixel structure Download PDFInfo
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- CN101162340B CN101162340B CN200710187534XA CN200710187534A CN101162340B CN 101162340 B CN101162340 B CN 101162340B CN 200710187534X A CN200710187534X A CN 200710187534XA CN 200710187534 A CN200710187534 A CN 200710187534A CN 101162340 B CN101162340 B CN 101162340B
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Abstract
The invention discloses a pixel structure which is suitable for being electrically connected with a scanning beam and a data wire. The pixel structure comprises an initiative element, a first pixel electrode, an average potential balanced circuit and a second pixel electrode, wherein, the initiative element is electrically connected with the scanning beam and the data wire, the first pixel electrode is electrically connected with initiative element, the average potential balanced circuit is also electrically connected with the scanning beam and the data wire, the second pixel electrode is electrically connected with the average potential balanced circuit, and the second pixel electrode and the first pixel electrode are electrically insulated from each other.
Description
Technical field
The present invention relates to a kind of display device, and relate in particular to a kind of LCD.
Background technology
(thin film transistor liquidcrystal display, performance requirement TFT-LCD) develop towards directions such as height contrast (high contrast ratio), the counter-rotating of no GTG (no gray scale inversion), colour cast little (little color shift), brightness height (high luminance), high color richness, high color saturation, rapid reaction and wide viewing angles existing market for film active member LCD.The technology that can reach the wide viewing angle requirement at present has stable twisted nematic liquid crystal (TN) to add view film (wide viewing film), copline suitching type (in-plane switching, IPS) LCD, a limit suitching type (fringe field switching, FFS) LCD and multidomain vertical alignment type (multi-domain vertically alignment, MVA) mode such as film active member LCD.With the multi-field vertical assigned LCD panel is example, because the orientation protrusion (al ignment protrusion) or the slit (slit) that are formed on colored optical filtering substrates or the film active component array base board can be so that liquid crystal molecule be multi-direction arrangement, and obtain a plurality of different alignments field (domains), so multi-field vertical assigned LCD panel can be reached the requirement of wide viewing angle.
Figure 1A illustrates the regular penetrance (normalized transmittance) of the multi-field vertical assigned LCD panel of prior art and the graph of a relation of GTG (gray level).Please refer to Figure 1A, horizontal ordinate is a GTG, and ordinate is regular penetrance, and wherein, the bug hole spacing is 4.2 microns.By Figure 1A as can be known, though the multi-field vertical assigned LCD panel of prior art can be reached the requirement of wide viewing angle, yet along with the visual angle of observing changes, penetrance has different curvature to the curve (transmittance-level curve) of GTG.In other words, when the visual angle of observing changed, the shown brightness meeting that goes out of the multiple domain vertical orientation type liquid crystal display of prior art changed, and then causes colour cast (color shift) or color saturation deficiency problems such as (color washout).
In order to solve the problem of colour cast, the technology of existing multiple prior art is suggested in succession.Wherein a kind of method is to form two pixel electrodes in single dot structure, and utilize capacity coupled mode, make the fixed ratio of the pixel voltage of one pixel electrode for the pixel voltage of another pixel electrode, and then make the different pixels electrode in the single pixel produce different big or small electric fields respectively, to allow the liquid crystal molecule of pixel electrode top that different arrangements is arranged respectively.Though aforesaid way can improve color offset phenomenon, owing to the phenomenon of voltage drift is arranged easily by the pixel voltage that capacitive coupling produced, and then cause the shortcoming of display frame distortion.
Figure 1B is the equivalent circuit diagram of dot structure of a kind of multi-field vertical assigned LCD panel of prior art, and it can improve the problem of above-mentioned pixel voltage drift.Please refer to Figure 1B, dot structure 10 is suitable for and one scan line 11 and a data line 12 electrically connect, and dot structure 10 comprises second active member 50 of first active member 20 that electrically connects with sweep trace 11 and data line 12, first pixel electrode 30, one second pixel electrode 40 and 40 electric connections of one and second pixel electrode that one and first active member 20 electrically connects.Wherein, second pixel electrode 40 couples by a coupling capacitance 60 and first pixel electrode 30, and second pixel electrode 40 is by the first pixel voltage Vp of coupling capacitance 60 from first pixel electrode 30
1Induction produces one second pixel voltage Vp
2Shown in Figure 1B, second pixel electrode 40 utilizes second active member 50 to stablize the second pixel voltage Vp
2
Please continue, though second active member 50 can improve voltage drift phenomenon, because the second pixel voltage Vp with reference to Figure 1B
2Be subjected to the influence that recalcitrates voltage (kick-backvoltage) that second active member 50 is caused, so the average second pixel voltage Vp of second pixel electrode 40
2The average first pixel voltage Vp with first pixel electrode 30
1Greatly differ from each other, cause display panels to produce the phenomenon that shows flicker (flicker).Moreover when first active member 20 was unlocked and carries out the charging procedure of first pixel electrode 30, second active member 50 also can be unlocked simultaneously and carry out the charging procedure of second pixel electrode 40, at this moment, and the second pixel voltage Vp of second pixel electrode 40
2Can produce the phenomenon of drift, the original demonstration GTG that causes changes.In addition, because the element characteristic of second active member 50 is (as the width/height ratio of channel layer, W/L) closely bound up with the demonstration GTG of second pixel electrode 40, therefore when the live width (line width) of second active member 50 or aligning (alignment) have a little variation because of technologic error, will cause the exhibit stabilization of LCD not good.
Summary of the invention
Technical matters to be solved by this invention is to propose a kind of dot structure, and it can improve flicker (flicker) and ghost problems such as (image sticking).
For achieving the above object, the present invention proposes a kind of dot structure, this dot structure is suitable for electrically connecting with an one scan line and a data line, and this dot structure comprises an active member, one first pixel electrode, an average potential balancing circuitry and one second pixel electrode.Active member and sweep trace and data line electrically connect.First pixel electrode and active member electrically connect.Average potential balancing circuitry and sweep trace and data line electrically connect.Second pixel electrode and average potential balancing circuitry electrically connect, and wherein second pixel electrode and first pixel electrode are electrically insulated.
In one embodiment of this invention, capacitance coupling effect between second pixel electrode and first pixel electrode makes second pixel electrode have a current potential, and the average potential balancing circuitry makes the average potential of second pixel electrode level off to the average potential of first pixel electrode.
In one embodiment of this invention, the average potential balancing circuitry comprises a control electrode, a gate insulation layer, an active layers, one first electrode and one second electrode.Control electrode and sweep trace electrically connect.。Active layers and control electrode partly overlap, and wherein active layers has an exhaustion region, and exhaustion region and control electrode do not overlap.Gate insulation layer is disposed between control electrode and the active layers.First electrode and second electrode are disposed on the active layers, and wherein first electrode and second electrode electrically connect with the data line and second pixel electrode respectively, and the subregion at least of the exhaustion region of active layers is between first electrode and second electrode.
In one embodiment of this invention, active layers has two channel regions separated from one another, and two channel regions are connected with exhaustion region, and first electrode is connected with two channel regions respectively with second electrode.
In one embodiment of this invention, active layers has a channel region, and channel region is connected with exhaustion region, and first electrode is connected with exhaustion region and channel region respectively with second electrode.
In one embodiment of this invention, control electrode has a breach, and the position of breach is corresponding to the position of exhaustion region.In addition, active layers has two channel regions separated from one another, and two channel regions are connected with exhaustion region, and first electrode is connected with two channel regions respectively with second electrode.In another embodiment, active layers has a channel region, and channel region is connected with exhaustion region, and first electrode is connected with exhaustion region and channel region respectively with second electrode.
In one embodiment of this invention, control electrode has an opening, and the position of opening is corresponding to the position of exhaustion region.In addition, active layers has two channel regions separated from one another, and two channel regions are connected with exhaustion region, and first electrode is connected with two channel regions respectively with second electrode.In another embodiment, active layers has a channel region, and channel region is connected with exhaustion region, and first electrode is connected with exhaustion region and channel region respectively with second electrode.
And, for achieving the above object, the present invention proposes another kind of dot structure, and this dot structure is suitable for electrically connecting with an one scan line and a data line, and this dot structure comprises an active member, one first pixel electrode, an average potential balancing circuitry and one second pixel electrode.Active member and sweep trace and data line electrically connect.First pixel electrode and active member electrically connect.Average potential balancing circuitry and sweep trace and data line electrically connect, and the average potential balancing circuitry comprises a control electrode that electrically connects with sweep trace and one and the active layers that partly overlaps of control electrode, wherein active layers has an exhaustion region, and exhaustion region and control electrode do not overlap.Second pixel electrode and average potential balancing circuitry electrically connect, and wherein second pixel electrode and first pixel electrode are electrically insulated.
Based on above-mentioned, dot structure of the present invention can be when improving colour cast, stablize current potential by the average potential balancing circuitry by capacitance coupling effect produced, so that the average potential of first pixel electrode in the dot structure equates the lifting display quality with the average potential of second pixel electrode.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Figure 1A illustrates the regular penetrance of multi-field vertical assigned LCD panel of prior art and the graph of a relation of GTG;
Figure 1B is the equivalent circuit diagram of dot structure of a kind of multi-field vertical assigned LCD panel of prior art;
Fig. 2 be a kind of dot structure of the present invention equivalent circuit diagram;
Fig. 3 A is the synoptic diagram of a kind of average potential balancing circuitry of the present invention;
Fig. 3 B is the synoptic diagram of a kind of average potential balancing circuitry of the present invention;
Fig. 3 C is the synoptic diagram of another kind of average potential balancing circuitry of the present invention;
Fig. 3 D is the synoptic diagram of another kind of average potential balancing circuitry of the present invention;
Fig. 3 E is the synoptic diagram of another average potential balancing circuitry of the present invention;
Fig. 3 F is the synoptic diagram of another average potential balancing circuitry of the present invention.
Wherein, Reference numeral:
10,100: dot structure 11,110: sweep trace
12,120: 20: the first active members of data line
50: the second active members 30,140: the first pixel electrodes
40,160: the second pixel electrodes 60,162: coupling capacitance
130: active member 150: the average potential balancing circuitry
150R: resistance 170: control electrode
180: active layers 180C: channel region
180D: exhaustion region 190A: first electrode
190B: the second electrode H: opening
N: breach Vp
1: first pixel voltage
Vp
2: the second pixel voltage V
Gh: cut-in voltage position standard
V
G1: close voltage level V
1: first current potential
V
2: second current potential
Embodiment
Fig. 2 is the equivalent circuit diagram of a kind of dot structure of the present invention.Please refer to Fig. 2, this dot structure 100 is suitable for electrically connecting with an one scan line 110 and a data line 120, and dot structure 100 comprises an active member 130, one first pixel electrode 140, an average potential balancing circuitry 150 and one second pixel electrode 160.Active member 130 electrically connects with sweep trace 110 and data line 120.First pixel electrode 140 electrically connects with active member 130.Average potential balancing circuitry 150 electrically connects with sweep trace 110 and data line 120.Second pixel electrode 160 electrically connects with average potential balancing circuitry 150, wherein second pixel electrode 160 and first pixel electrode 140 are electrically insulated, and the capacitance coupling effect between second pixel electrode 160 and first pixel electrode 140 makes second pixel electrode 160 have a current potential, and average potential balancing circuitry 150 makes the average potential of second pixel electrode 160 level off to the average potential of first pixel electrode 140.
Auspicious speech it, when the voltage of sweep trace 110 is the accurate V in cut-in voltage position
GhThe time, active member 130 is unlocked and carries out the charging procedure of first pixel electrode 140, via data line 120 inputs one pixel voltage to the first pixel electrode 140, makes that this pixel voltage is the first current potential V
1, and the capacitance coupling effect between second pixel electrode 160 and first pixel electrode 140 makes the first current potential V of second pixel electrode 160 via first pixel electrode 140
1Coupling produces another pixel voltage, and this another pixel voltage is the second current potential V
2As shown in Figure 2, there is a coupling condenser 162 between first pixel electrode 140 and second pixel electrode 160, can adjust capacitance coupling effect size between first pixel electrode 140 and second pixel electrode 160 by coupling condenser 162, and the second current potential V of second pixel electrode 160
2Also can therefore be adjusted.
It should be noted that when dot structure 100 charges average potential balancing circuitry 150 can suppress the second current potential V of 120 pairs second pixel electrodes 160 of data line
2Influence, and then make the average second current potential V of second pixel electrode 160
2Level off to the average first current potential V of first pixel electrode 140
1On the other hand, when the voltage of sweep trace 110 for closing voltage level V
G1The time, dot structure 100 is in the stage that current potential keeps (holding), and at this moment, average potential balancing circuitry 150 can be stablized the second current potential V of second pixel electrode 160
2Hereinafter will be to average potential balancing circuitry 150 explanation in detail.
Fig. 3 A be a kind of average potential balancing circuitry of the present invention on look synoptic diagram.Please refer to Fig. 3 A and Fig. 2, average potential balancing circuitry 150 comprises a control electrode 170, a gate insulation layer (not illustrating), an active layers 180 and the first electrode 190A and the second electrode 190B.Control electrode 170 electrically connects with sweep trace 110.Active layers 180 overlaps with control electrode 170 parts, and wherein active layers 180 has an exhaustion region 180D, and exhaustion region 180D does not overlap with control electrode 170 and 170 controls of uncontrolled electrode.In addition, gate insulation layer (not illustrating) is disposed between control electrode 170 and the active layers 180.What deserves to be mentioned is, in the present embodiment, control electrode 170 is disposed at the below of active layers 180, in other embodiments, control electrode 170 also can design in the top of active layers 180, so the present invention does not limit the configuration sequence of control electrode 170 and active layers 180.In addition, the first electrode 190A and the second electrode 190B are disposed on the active layers 180, wherein the first electrode 190A and the second electrode 190B electrically connect with the data line 120 and second pixel electrode 160 respectively, and the subregion at least of the exhaustion region 180D of active layers 180 is between the first electrode 190A and the second electrode 190B.In the present embodiment, active layers 180 has two channel region 180C separated from one another, and two channel region 180C are connected with exhaustion region 180D, and the first electrode 190A is connected with two channel region 180C respectively with the second electrode 190B.
Generally speaking, the voltage when sweep trace 110 is the accurate V in cut-in voltage position
GhThe time, the channel region 180C of the active layers 180 that overlaps with control electrode 170 is unlocked the first electrode 190A and the second electrode 190B conducting by the channel region 180C of unlatching, the transmission of the line data of going forward side by side.Specifically, the active layers 180 of the average potential balancing circuitry 150 of present embodiment have one not with control electrode 170 overlapping exhaustion region 180D, even this exhaustion region 180D is transfused to the accurate V in cut-in voltage position at control electrode 170
GhThe time, still keep closed condition, therefore the first electrode 190A and the second electrode 190B can keep independent each other, and keep its original data transmission separately.
Please be simultaneously with reference to Fig. 2 and Fig. 3 A, the first electrode 190A of Fig. 3 A is connected with the data line 120 of Fig. 2, and the second electrode 190B of Fig. 3 A is connected with second pixel electrode 160 of Fig. 2.When the voltage of sweep trace 110 is the accurate V in cut-in voltage position
GhThe time, first pixel electrode 140 is via the active member 130 inputs first current potential V that opens
1The control electrode 170 of average potential balancing circuitry 150 is also opened the channel region 180C of active layers 180 simultaneously at this moment, but because not Be Controlled electrode 170 unlatchings of the exhaustion region 180D of active layers 180, in Fig. 2, be equal to the resistance 150R in the equivalent electrical circuit, therefore, this moment data line 120 the first current potential V
1Can't cause second pixel electrode 160 and seriously influence.Make second pixel electrode 160 continue to keep the second current potential V
2Therefore, average potential balancing circuitry 150 be different from prior art second active member 50 (being illustrated in Figure 1B), can be when first pixel electrode 140 charges, suppress the second current potential V of 120 pairs second pixel electrodes 160 of data line
2Influence, therefore and suppress to recalcitrate the generation of voltage, make the average second current potential V of second pixel electrode 160
2Level off to the average first current potential V of first pixel electrode 140
1, and then make display panels when showing, can effectively reduce the problem of flicker, and improve the demonstration ghost problem under the long-time operation.
Please continue simultaneously with reference to Fig. 2 and Fig. 3 A, when the voltage level of sweep trace 110 for closing voltage level V
G1The time, first pixel electrode 140 and second pixel electrode 160 are in the state that current potential keeps, because average potential balancing circuitry 150 itself has leakage current generating, therefore second pixel electrode 160 promptly can be stablized the second current potential V by the leakage current in the average potential balancing circuitry 150
2The problem of drift.
It should be noted that the present invention does not limit the distribution form of the active layers 180 of average potential balancing circuitry 150, Fig. 3 B be another kind of average potential balancing circuitry on look synoptic diagram.Please refer to Fig. 3 B, active layers 180 also can be to have a channel region 180C who is connected with exhaustion region 180D, and the first electrode 190A is connected with exhaustion region 180D and channel region 180C respectively with the second electrode 190B.Certainly, the position of the first electrode 190A and the second electrode 190B also can exchange, and in other words, the first electrode 190A is connected with channel region 180C and exhaustion region 180D respectively with the second electrode 190B.
In addition, the deviser can be in response to layout space, aperture opening ratio or other design requirement of dot structure 100, and further the shape at the control electrode 170 of average potential balancing circuitry 150 adjusts.Fig. 3 C looks synoptic diagram on the another kind of average potential balancing circuitry of the present invention.Please refer to Fig. 3 C, control electrode 170 has a breach N, and the position of breach N is corresponding to the position of exhaustion region 180D.Active layers 180 has two channel region 180C separated from one another, and two channel region 180C are connected with exhaustion region 180D, and the first electrode 190A is connected with two channel region 180C respectively with the second electrode 190B.Certainly, active layers 180 also can only have a channel region 180C who is connected with exhaustion region 180D, and the distribution form that is connected with exhaustion region 180D and channel region 180C respectively of the first electrode 190A and the second electrode 190B, shown in Fig. 3 D.With above-mentioned, the position of the first electrode 190A and the second electrode 190B also can exchange, so the present invention does not limit shape, quantity and the allocation position of the breach N of the distribution form of active layers 180 and control electrode 170.
Hold above-mentionedly, Fig. 3 E looks synoptic diagram on another average potential balancing circuitry of the present invention.Please refer to Fig. 3 E, control electrode 170 has an opening H, and the position of opening H is corresponding to the position of exhaustion region 180D.Active layers 180 has two channel region 180C separated from one another, and two channel region 180C are connected with exhaustion region 180D, and the first electrode 190A is connected with two channel region 180C respectively with the second electrode 190B.Certainly, active layers 180 also can be the form that is illustrated as Fig. 3 F, and active layers 180 has a channel region 180C who is connected with exhaustion region 180D, and the first electrode 190A is connected with exhaustion region 180D and channel region 180C respectively with the second electrode 190B.With above-mentioned, the position of the first electrode 190A and the second electrode 190B also can exchange, so the present invention does not limit shape, quantity and the allocation position of the opening H of the distribution form of active layers 180 and control electrode 170.
Based on above-mentioned, dot structure of the present invention can be stablized second current potential that passes through second pixel electrode, the film flicker when avoiding showing by the average potential balancing circuitry when improving the colour cast problem of display panels.Simultaneously under long-time operation, the ghost problem that the present invention can avoid first pixel electrode and second pixel electrode to derive because of average potential is different.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (11)
1. a dot structure is suitable for electrically connecting with an one scan line and a data line, it is characterized in that this dot structure comprises:
One active member electrically connects with this sweep trace and this data line;
One first pixel electrode electrically connects with this active member;
One average potential balancing circuitry, electrically connect with this sweep trace and this data line, this average potential balancing circuitry comprises a control electrode and an active layers, this control electrode and this sweep trace electrically connect, this active layers and this control electrode partly overlap, wherein this active layers has an exhaustion region, and this exhaustion region and this control electrode do not overlap; And
One second pixel electrode electrically connects with this average potential balancing circuitry, and wherein this second pixel electrode and this first pixel electrode are electrically insulated.
2. dot structure according to claim 1, it is characterized in that, capacitance coupling effect between this second pixel electrode and this first pixel electrode makes this second pixel electrode have a current potential, and this average potential balancing circuitry makes the average potential of this second pixel electrode level off to the average potential of this first pixel electrode.
3. dot structure according to claim 1 is characterized in that, this average potential balancing circuitry also comprises:
One gate insulation layer is disposed between this control electrode and this active layers; And
One first electrode and one second electrode, be disposed on this active layers, wherein this first electrode and this data line electrically connect, and this second electrode and this second pixel electrode electrically connect, and the subregion at least of this exhaustion region of this active layers is between this first electrode and this second electrode.
4. dot structure according to claim 3 is characterized in that, this active layers has two channel regions separated from one another, and this two channel region is connected with this exhaustion region, and this first electrode is connected with this two channel region respectively with this second electrode.
5. dot structure according to claim 3 is characterized in that this active layers has a channel region, and this channel region is connected with this exhaustion region, and this first electrode is connected with this exhaustion region and this channel region respectively with this second electrode.
6. dot structure according to claim 3 is characterized in that this control electrode has a breach, and the position of this breach is corresponding to the position of this exhaustion region.
7. dot structure according to claim 6 is characterized in that, this active layers has two channel regions separated from one another, and this two channel region is connected with this exhaustion region, and this first electrode is connected with this two channel region respectively with this second electrode.
8. dot structure according to claim 6 is characterized in that this active layers has a channel region, and this channel region is connected with this exhaustion region, and this first electrode is connected with this exhaustion region and this channel region respectively with this second electrode.
9. dot structure according to claim 3 is characterized in that this control electrode has an opening, and the position of this opening is corresponding to the position of this exhaustion region.
10. dot structure according to claim 9 is characterized in that, this active layers has two channel regions separated from one another, and this two channel region is connected with this exhaustion region, and this first electrode is connected with this two channel region respectively with this second electrode.
11. dot structure according to claim 9 is characterized in that, this active layers has a channel region, and this channel region is connected with this exhaustion region, and this first electrode is connected with this exhaustion region and this channel region respectively with this second electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710187534XA CN101162340B (en) | 2007-11-21 | 2007-11-21 | Pixel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710187534XA CN101162340B (en) | 2007-11-21 | 2007-11-21 | Pixel structure |
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| CN101162340A CN101162340A (en) | 2008-04-16 |
| CN101162340B true CN101162340B (en) | 2010-06-02 |
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| CN200710187534XA Active CN101162340B (en) | 2007-11-21 | 2007-11-21 | Pixel structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852955B (en) * | 2009-04-02 | 2011-11-16 | 华映视讯（吴江）有限公司 | Liquid crystal display device capable of eliminating afterimages and method thereof |
| CN102130136B (en) * | 2010-11-25 | 2013-04-10 | 华映视讯（吴江）有限公司 | Pixel structure and bigrid pixel structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000019559A (en) * | 1998-07-01 | 2000-01-21 | Canon Inc | Liquid crystal element |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000019559A (en) * | 1998-07-01 | 2000-01-21 | Canon Inc | Liquid crystal element |
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