CN100468140C - Vertical alignment type liquid crystal display device and pixel unit circuit thereof - Google Patents
Vertical alignment type liquid crystal display device and pixel unit circuit thereof Download PDFInfo
- Publication number
- CN100468140C CN100468140C CNB2006100930792A CN200610093079A CN100468140C CN 100468140 C CN100468140 C CN 100468140C CN B2006100930792 A CNB2006100930792 A CN B2006100930792A CN 200610093079 A CN200610093079 A CN 200610093079A CN 100468140 C CN100468140 C CN 100468140C
- Authority
- CN
- China
- Prior art keywords
- pixel
- liquid crystal
- voltage
- pixel cell
- coupling electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 104
- 230000008878 coupling Effects 0.000 claims abstract description 145
- 238000010168 coupling process Methods 0.000 claims abstract description 145
- 238000005859 coupling reaction Methods 0.000 claims abstract description 145
- 239000003990 capacitor Substances 0.000 claims abstract description 56
- 239000000758 substrate Substances 0.000 claims description 42
- 239000010409 thin film Substances 0.000 claims description 28
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000012212 insulator Substances 0.000 claims description 10
- 239000010408 film Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 239000011521 glass Substances 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 9
- 238000007323 disproportionation reaction Methods 0.000 description 8
- 101100006553 Mus musculus Clcn3 gene Proteins 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 101150096622 Smr2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Images
Landscapes
- Liquid Crystal (AREA)
Abstract
The disclosed vertical fit-pixel LCD with pixel cell circuit comprise: it divides every pixel cell into three sub-pixel cells; wherein, the auxiliary capacitor in the first/second/third sub-cell connects with the first coupling signal line provided the first coupling electrode signal, the co-voltage line, and the second coupling signal line, respectively; it controls the voltage and phase of coupling electrode signal to generate different pixel voltage on three sub cells. This invention can overcome the uneven brightness defect.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator, relate in particular to a kind of vertical alignment liquid crystal display device and pixel unit circuit thereof.
Background technology
Two kinds of common liquid crystal drive modes comprise twisted nematic (TN:Twisted Nematic) pattern and vertical orientation (VA:Vertically-aligned) pattern at present.
When adopting the TN pattern to drive liquid crystal, the liquid crystal of LCD is under the situation that does not add any electric field, and liquid crystal can not rotate, and makes the light source of backlight module can pass liquid crystal and Polarizer, and then cause display to present complete white picture, generally be referred to as " Normally White ".
Although it is progressive significantly that the correlation technique of TN LCD has had in recent years, and contrast and color saturation that the TN LCD is provided (for example: the cathode ray tube (CRT) display) also are better than traditional monitor.Yet the TN LCD has a critical shortcoming, and promptly the angular field of view of TN LCD is narrow, makes its application be restricted.
When adopting the VA pattern to drive liquid crystal, the liquid crystal of LCD is under the situation that does not add any electric field, and liquid crystal can not rotate, and the light source of backlight module can be stopped by liquid crystal and can not pass liquid crystal and Polarizer, display can present complete black picture, generally is referred to as " Normally Black ".When predeterminated voltage was provided, liquid crystal molecule was aligned to horizontal direction, and then display can present complete white picture.
When showing, the contrast that is provided by the VA LCD is than contrast height that TN LCD provided.In addition, the reaction time of VA LCD is also than comparatively fast, and has preferable wide viewing angle for white picture and black picture.So, a kind of new LCD of VA LCD for attracting attention at present.Yet the VA LCD can cause the brightness disproportionation at various angles of display because of the different birefringent characteristics of its each liquid crystal.
Figure 1 shows that the tint ramp synoptic diagram of existing multiregional vertical align (MVA:Multi-Domain VerticalAlignment) liquid crystal indicator, wherein D
1Be the tint ramp of existing multiregional vertical align (MVA) liquid crystal indicator, I
1Be desirable tint ramp.Comparison tint ramp D
1With tint ramp I
1Can learn that existing multiregional vertical align liquid crystal indicator has the problem of brightness disproportionation really at various angles of display, especially (for example: 120 degree), tone characteristic that existing multiregional vertical align liquid crystal indicator is presented and desirable tone characteristic differ very big at many angles of display.
Figure 2 shows that the structural representation of existing multiregional vertical align liquid crystal indicator, it has shown the structural representation of a pixel cell 1.In Fig. 2, comprise first substrate 11 and second substrate 12.Between first substrate 11 and second substrate 12, have a plurality of liquid crystal molecules 141,142,143,144.On the surface of first substrate 11, be coated with common electrode 111, and a plurality of protrusions (Protrusion) 13 are arranged on the surface of common electrode 111.On the surface of second substrate 12, be coated with pixel electrode 121, and on pixel electrode 121, have a plurality of slits (Slit) 15.
Because all pixel cells of existing MVA liquid crystal indicator are when same gray scale states, the angle of inclination of the liquid crystal molecule of inferior pixel cell can be identical.For example: the angle of inclination of the liquid crystal molecule 141,142 among Fig. 2 is identical with the angle of inclination of liquid crystal molecule 143,144.So, will make the brightness disproportionation of panel, and make display quality reduce.
In order to address the above problem, Japanese patent application case publication number JP2004-258139 and JP2004-62146 have disclosed a kind of liquid crystal indicator, and its each pixel is divided into pixel cell two times by two pixel electrodes and two auxiliary capacitors; And for each pixel provides first operating voltage (V1 (gk)) and second operating voltage (V2 (gk)), wherein first operating voltage is different with second operating voltage, and the difference of first operating voltage and second operating voltage forms by the capacitive coupling driving method.Therefore, cut apart two pixel cells of above-mentioned Japanese patent application case utilization are offset with the angle gamma that the operating voltage of different voltages improves in the part GTG.Extremely shown in Figure 5 as Fig. 3, gamma (Gamma: the GTG penetrance) curve synoptic diagram for above-mentioned Japanese patent application case, there is shown angle gamma skew (Gamma curve by viewing angle (offset)), ordinate among the figure is penetrance (Transmittance), and horizontal ordinate is gray-scale value (Gray Level).As shown in Figure 3, for improving the angle gamma skew of low GTG, wherein the pixel cutting rate is: pixel cell is 0.3 for the first time, and pixel cell is 0.7 (Pixel Ratio 30 (H): 70 (L)) for the second time.As shown in Figure 4, for improving the angle gamma skew of high gray, wherein the pixel cutting rate is: pixel cell is 0.7 for the first time, and pixel cell is 0.3 (Pixel Ratio 70 (H): 30 (L)) for the second time.As shown in Figure 5, be the angle gamma skew of GTG in improving, wherein the pixel cutting rate is: pixel cell is 0.5 for the first time, and pixel cell is 0.5 (Pixel Ratio 50 (H): 50 (L)) for the second time.Yet above-mentioned Japanese patent application case still can't effectively be improved the angle gamma skew of all GTGs, and therefore, still can there be the problem of brightness disproportionation in the LCD that above-mentioned Japanese patent application case is provided when showing.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of vertical alignment liquid crystal display device and pixel unit circuit thereof.It can improve the visual angle problem of vertical alignment liquid crystal display device; Can improve the problem that produces brightness disproportionation in different visual angles.
The invention provides a kind of pixel unit circuit.The pixel unit circuit of described vertical alignment liquid crystal display device comprises:
One first time pixel cell comprises one first auxiliary capacitor, and an end and of described first auxiliary capacitor provides first coupling signal wire of one first coupling electrode signal to be electrically connected;
One second pixel cell comprise one second auxiliary capacitor, and an end and of described second auxiliary capacitor provides the common voltage line of a common voltage to be electrically connected;
One the 3rd pixel cell comprise one the 3rd auxiliary capacitor, and an end and of described the 3rd auxiliary capacitor provides second coupling signal wire of one second coupling electrode signal to be electrically connected.
Wherein, described first time pixel cell has a pixel voltage for the first time, described second time pixel cell has a pixel voltage for the second time, described the 3rd time pixel cell has a pixel voltage for the third time, and described first time pixel voltage, pixel voltage and pixel voltage is different respectively for the third time for the second time; Described first time the pixel voltage described first coupling electrode signal that is coupled, the described pixel voltage for the third time described second coupling electrode signal that is coupled.
Described first coupling signal wire, second coupling signal wire and common voltage line are identical with the material of one scan line.
Described first time pixel cell also comprises a first film transistor and one first liquid crystal capacitance.The transistorized source electrode of described the first film is electrically connected with a data line, and the transistorized grid of the first film is electrically connected with described sweep trace, and the first film transistor drain is electrically connected with an end of described first liquid crystal capacitance and the other end of first auxiliary capacitor.
Described data line provides a data-signal, and the pulse width of the described first coupling electrode signal and the second coupling electrode signal is 1～6 times of described data-signal.
Described second pixel cell also comprises one second thin film transistor (TFT) and one second liquid crystal capacitance.The source electrode of described second thin film transistor (TFT) is electrically connected with a data line, and the grid of second thin film transistor (TFT) is electrically connected with described sweep trace, and the drain electrode of second thin film transistor (TFT) is electrically connected with an end of second liquid crystal capacitance and the other end of second auxiliary capacitor.
Described the 3rd pixel cell also comprises one the 3rd thin film transistor (TFT) and one the 3rd liquid crystal capacitance.The source electrode of described the 3rd thin film transistor (TFT) is electrically connected with a data line, and the grid of the 3rd thin film transistor (TFT) is electrically connected with described sweep trace, and the drain electrode of the 3rd thin film transistor (TFT) is electrically connected with an end of the 3rd liquid crystal capacitance and the other end of the 3rd auxiliary capacitor.
The described first coupling electrode signal and the second coupling electrode voltage of signals are an alternating voltage, and described common voltage is a direct current voltage.
Described first time pixel voltage, for the second time pixel voltage and for the third time pixel voltage be 0.5～2 volt.
Described first coupling electrode signal and the second coupling electrode signal inversion, 180 degree.
The aperture opening ratio of described first time pixel cell is identical with the aperture opening ratio of the 3rd pixel cell.
The aperture opening ratio of described first time pixel cell is less than the aperture opening ratio of described the 3rd pixel cell.
The present invention also provides a kind of vertical alignment liquid crystal display device.Described vertical alignment liquid crystal display device comprises:
One first substrate comprises a common conductive layer and an a plurality of protrusion, and described common conductive layer is positioned on described first substrate, and described protrusion is positioned at the part surface of common conductive layer;
One second substrate comprises a plurality of pixel electrodes, a plurality of first coupling electrode, a plurality of second coupling electrode, a plurality of common electrode and a gate insulator; Described first coupling electrode, second coupling electrode and common electrode are positioned at the part surface of described second substrate, described gate insulator is positioned at the surface of described first coupling electrode, second coupling electrode and common electrode and is positioned at the other parts surface of described second substrate, and described pixel electrode is positioned at the part surface of gate insulator.
Described first substrate and second substrate are formed with a plurality of pixel cells, and each pixel cell comprises:
One first time pixel cell comprises one first auxiliary capacitor, and one of them of described first auxiliary capacitor and described first coupling electrode is electrically connected;
One second time pixel cell comprises one second auxiliary capacitor, and one of them of described second auxiliary capacitor and described common electrode is electrically connected;
One the 3rd time pixel cell comprises one the 3rd auxiliary capacitor, and one of them of described the 3rd auxiliary capacitor and described second coupling electrode is electrically connected.
Wherein each first coupling electrode is in order to provide one first coupling electrode signal, and each second coupling electrode is in order to provide one second coupling electrode signal, and each common electrode is in order to provide a common voltage; And the pixel voltage of the pixel voltage of the pixel voltage of described first time pixel cell, second pixel cell and the 3rd pixel cell is different respectively; The pixel voltage of described first time pixel cell described first coupling electrode signal that is coupled, the pixel voltage of described the 3rd the pixel cell described second coupling electrode signal that is coupled.
The described first coupling electrode signal and the second coupling electrode voltage of signals are an alternating voltage, and described common voltage is a direct current voltage.
Described vertical alignment liquid crystal display device also comprises a liquid crystal layer, between described first substrate and second substrate.
Described first substrate also comprises a colored filter, and described colored filter is between first substrate and common conductive layer.
Described second substrate also comprises a protective seam, and described protective seam is positioned on the gate insulator, and described pixel electrode is positioned at the part surface of protective seam.
Described second substrate also comprises a homeotropic alignment layer, and described homeotropic alignment layer is positioned at the surface of pixel electrode and the other parts surface of protective seam.
Described first time pixel cell, for the second time pixel cell and for the third time the pixel voltage of pixel cell be 0.5～2 volt.
Described first coupling electrode signal and the second coupling electrode signal inversion, 180 degree.
The aperture opening ratio of described first time pixel cell is identical with the aperture opening ratio of the 3rd pixel cell.
The aperture opening ratio of described first time pixel cell is less than the aperture opening ratio of described the 3rd pixel cell.
Beneficial effect of the present invention is, can improve the visual angle problem of vertical orientation type display device; And can improve the problem that produces brightness disproportionation in different visual angles.
Description of drawings
Fig. 1 is the tint ramp synoptic diagram of existing multiregional vertical align liquid crystal indicator;
Fig. 2 is the structural representation of existing multiregional vertical align liquid crystal indicator;
Fig. 3 is a wherein gamma curve synoptic diagram of implementing of available liquid crystal display device;
Fig. 4 is the wherein gamma curve synoptic diagram of another enforcement of available liquid crystal display device;
Fig. 5 is the wherein gamma curve synoptic diagram of another enforcement of available liquid crystal display device;
Fig. 6 is the circuit diagram of the pixel cell of a preferred embodiment of the present invention;
Fig. 7 is the pixel voltage waveform synoptic diagram of inferior pixel cell included in the single pixel cell;
Fig. 8 is the cut-open view of the vertical alignment liquid crystal display device of preferred embodiment of the present invention;
Fig. 9 is the wiring diagram of the pixel cell 6 of vertical alignment liquid crystal display device of the present invention;
Figure 10 is the tint ramp synoptic diagram of existing vertical alignment liquid crystal display device;
Figure 11 is the tint ramp synoptic diagram of the direction matching type LCD device that preferred embodiment of the present invention provided.
Embodiment
Relevant preferred embodiment of the present invention is with reference to image element circuit synoptic diagram shown in Figure 6.In Fig. 6, single pixel cell 6 comprises a plurality of pixel cells (inferior pixel cell 61, inferior pixel cell 62 and inferior pixel cell 63), data line (Vs1) 64, sweep trace (Vg) 65, first coupling signal wire (Vcs1) 66, common voltage line (Vcs) 67 and second coupling signal wire (Vcs2) 68.Wherein time pixel cell 61 comprises thin film transistor (TFT) 611, liquid crystal capacitance 612 and auxiliary capacitor 613; Inferior pixel cell 62 comprises thin film transistor (TFT) 621, liquid crystal capacitance 622 and auxiliary capacitor 623; Inferior pixel cell 63 comprises thin film transistor (TFT) 631, liquid crystal capacitance 632 and auxiliary capacitor 633.
In the present embodiment, the material of first coupling signal wire 66, common voltage line 67 and second coupling signal wire 68 is identical with sweep trace 65.In the present embodiment, first coupling signal wire 66 is in order to provide the first coupling electrode signal, and second coupling signal wire 68 is in order to provide the second coupling electrode signal.In addition, the first coupling electrode signal and the second coupling electrode signal all are AC signal, the first coupling electrode signal and the second coupling electrode signal inversion 180 degree, and 1～6 times of the data-signal that provided for data line 64 of the deration of signal of the first coupling electrode signal and the second coupling electrode signal.The voltage signal that common voltage line 67 is provided is a d. c. voltage signal.
The above-mentioned first coupling electrode signal and the second coupling electrode signal have first voltage level and second voltage level respectively.For example: in the present embodiment, first voltage level is a low-voltage position standard, and second voltage level is a high voltage level.In other embodiments, first voltage level can be high voltage level, and second voltage level can be low-voltage position standard.Because the first coupling electrode signal is spent with the second coupling electrode signal inversion 180, so when the first coupling electrode signal was high voltage level, the second coupling electrode signal was a low-voltage position standard.
Because first coupling signal wire 66 is electrically connected with first auxiliary capacitor 613, common voltage line 67 is electrically connected with second auxiliary capacitor 623, and second coupling signal wire 68 is electrically connected with the 3rd auxiliary capacitor 633.And first coupling signal wire 66 provides voltage, the common voltage line 67 to inferior pixel cell 61 to provide to the voltage of inferior pixel cell 62 and second coupling signal wire 68 and provides all different to the voltage of inferior pixel cell 63, and the pixel voltage of pixel cell 61,62,63 will difference in proper order in institute.
The pixel voltage of above-mentioned pixel cell 61,62,63 can obtain according to following formula:
Vp1＝(Cs1/(Cs1+Clc1+Cgd1))*Vcs1+Vsig
Vp2＝Vsig
Vp3＝(Cs3/(Cs3+Clc3+Cgd3))*Vcs3-Vsig
Wherein, Vp1 is the pixel voltage of time pixel cell 61, Vp2 is the pixel voltage of time pixel cell 62, Vp3 is the pixel voltage of time pixel cell 63, the operating voltage that Vsig is provided for data line 64, the first coupling electrode voltage of signals position standard that Vcs1 is provided for first coupling signal wire 66, the second coupling electrode voltage of signals position standard that Vcs3 is provided for second coupling signal wire 68, Cs1 is an auxiliary capacitor 613, Clc1 is a liquid crystal capacitance 612, and Cgd1 is the electric capacity of the grid leak interpolar of thin film transistor (TFT) 611, and Cs3 is an auxiliary capacitor 633, Clc3 is a liquid crystal capacitance 632, and Cgd3 is the electric capacity of the grid leak interpolar of thin film transistor (TFT) 631.
Because present embodiment provides different pixel voltages (Vp1, Vp2, Vp3) for different inferior pixel cell 61,62,63, the angle of inclination of affiliated liquid crystal molecule can differ from one another in the following pixel cell 61,62,63 of institute.For example: the angle of inclination of the liquid crystal molecule under the angle of inclination of the liquid crystal molecule under the inferior pixel cell 61 and time pixel cell 62 is different, and the angle of inclination of the liquid crystal molecule that the angle of inclination of the liquid crystal molecule under the inferior pixel cell 62 and inferior pixel cell 63 are affiliated is different.Therefore, the phase delay that the phase delay (Phase Retardation) that in the inferior pixel cell 61,62,63 one of them time pixel cell is produced just can be produced by other time pixel cell in the inferior pixel cell 61,62,63 compensates, thereby can improve all GTG visual angles, and improve the gamma characteristic of display panel.In the present embodiment, the pixel voltage of each time pixel cell 61,62,63 is preferably 0.5 volt～2 volts.
Figure 7 shows that the pixel voltage waveform synoptic diagram of described time included in single pixel cell pixel cell.Relevant its explanation is in the lump with reference to Fig. 6.In Fig. 7, A1 is the waveform of the pixel voltage of time pixel cell 61, the waveform of the first coupling electrode signal that A2 is provided for first coupling signal wire 66; B1 is the waveform of the pixel voltage of time pixel cell 62, and the voltage level of common voltage line 67 common voltage that provides is provided B2; C1 is the waveform of the pixel voltage of time pixel cell 63, the waveform of the second coupling electrode signal that C3 is provided for second coupling signal wire 68.
After the pixel voltage of inferior pixel cell 61 charges to the voltage level of the data-signal that data line 64 provided, the pixel voltage of inferior pixel cell 61 can be slightly toward descending, then see through the first coupling electrode signal that coupling first coupling signal wire 66 is provided, the pixel voltage of feasible time pixel cell 61 rises (voltage up) and the voltage level of the data-signal that approaching data line 64 is originally provided, shown in A1.
After the pixel voltage of inferior pixel cell 62 charges to the voltage level of the data-signal that data line 64 provided, the pixel voltage of inferior pixel cell 62 can be slightly toward descending, and the voltage level of the common voltage that the pixel voltage of the inferior pixel cell 62 after reducing and common pressure-wire 67 are provided much at one, shown in B1.Therefore, the pixel voltage of inferior pixel cell 62 is different with the pixel voltage of time pixel cell 61.
After the pixel voltage of inferior pixel cell 63 charges to the voltage level of the data-signal that data line 64 provided, the pixel voltage of inferior pixel cell 63 can be slightly toward descending, then see through the second coupling electrode signal that coupling second coupling signal wire 68 is provided, make the pixel voltage of time pixel cell 63 reduce (voltage down) again, shown in C1.The pixel voltage of the pixel voltage of the pixel voltage of inferior pixel cell 63, inferior pixel cell 62 and time pixel cell 61 is all different.
Next, will illustrate how to form foregoing image element circuit.
Figure 8 shows that the cut-open view of preferred embodiment vertical alignment liquid crystal display device of the present invention.It comprises glass substrate 811 and glass substrate 812, and includes negative sense liquid crystal layer 82 between glass substrate 811 and glass substrate 812.Wherein negative sense liquid crystal layer 82 comprises a plurality of liquid crystal molecules 821,822,823,824,825,826 with different phase of negative permittivity.
One deck colored filter 83 is arranged on glass substrate 811, one common conductive layer 84 is then arranged on colored filter 83, and have additional a plurality of protrusions 851,852,853 on common conductive layer 84, wherein protrusion 851,852,853 is positioned on the part surface of common conductive layer 84.
Gate insulator 86 is arranged, cloth matcoveredn 87 then on gate insulator 86 on glass substrate 812.Wherein have additional first coupling electrode 881, common electrode 882 and second coupling electrode 883 on glass substrate 812, wherein first coupling electrode 881, common electrode 882 and second coupling electrode 883 are positioned on the part surface of glass substrate 812; And first coupling electrode 881 is electrically connected with auxiliary capacitor 613, and common electrode 882 is electrically connected with auxiliary capacitor 623, and second coupling electrode 883 is electrically connected with auxiliary capacitor 633.Wherein first coupling electrode 881 is in order to provide the first coupling electrode signal, and common electrode 882 is in order to provide common voltage, and second coupling electrode 883 is in order to provide the second coupling electrode signal.That is, first coupling electrode 881 can be formed at first coupling signal wire 66 among Fig. 6, and common electrode 882 can be formed at common voltage line 67, the second coupling electrodes 883 among Fig. 6 can be formed at second coupling signal wire 68 among Fig. 6.
Because Fig. 8 has only shown the cut-open view of single pixel, so Fig. 8 has only shown single first coupling electrode 881, single common electrode 882 and single second coupling electrode 883.Under actual conditions, the surface of glass substrate 812 is provided with a plurality of first coupling electrodes, a plurality of common electrode and a plurality of second coupling electrode.
In addition, be furnished with a plurality of pixel electrodes 891,892,893,894,895,896 on the above-mentioned protective seam 87.Wherein pixel electrode 891,892,893,894,895,896 is positioned on the part surface of protective seam 87, and homeotropic alignment layer 80 is positioned on the other parts surface of the surface of pixel electrode 891,892,893,894,895,896 and protective seam 87.In addition, between the pixel electrode 891,892,893,894,895,896, have a plurality of slits 801,802,803.
In single pixel cell 6, the aperture opening ratio of first time pixel cell 61 is less than or equal to the aperture opening ratio of the 3rd pixel cell 63.The auxiliary capacitor 613 of first time pixel cell 61 be connected by first coupling electrode, 881 formed first coupling signal wire 66, the auxiliary capacitor 623 of second time pixel cell 62 be connected by common electrode 882 formed common voltage lines 67, the auxiliary capacitor 633 of the 3rd inferior pixel cell 63 be connected by second coupling electrode, 883 formed second coupling signal wire 68.Therefore, can utilize coupling electrode signal that first coupling signal wire 66 and second coupling signal wire 68 provide out of phase, and keep the pixel voltage of second pixel cell 62 to auxiliary capacitor 613,633.So that the pixel voltage of the pixel voltage of the pixel voltage of first time pixel cell 61, second pixel cell 62 and the 3rd pixel cell 63 is all different.So that the liquid crystal molecule 821,822 under first time pixel cell 61; Liquid crystal molecule 825, liquid crystal molecule 826 under second time pixel cell 62; The angle of inclination that reaches the 3rd liquid crystal molecule 823,824 under the pixel cell 63 is all different, to improve the problem of vertical alignment liquid crystal display device brightness disproportionation.
Figure 9 shows that the wiring diagram of the pixel cell 6 of vertical alignment liquid crystal display device of the present invention, it comprises time pixel cell 61,62,63; Thin film transistor (TFT) 611,621,631; First coupling electrode 881; Common electrode 882; Second coupling electrode 883; Sweep trace (grid bus wiring) 651,652; And data line 64.
Described pixel cell 61,62,63; Thin film transistor (TFT) 611,621,631; First coupling electrode 881; Common electrode 882; Second coupling electrode 883; Sweep trace 651,652; And data line 64 all is in the layout of on the glass substrate 812 among Fig. 8.And first coupling electrode 881 is parallel with sweep trace 651,652.
Figure 10 is to the comparison synoptic diagram that Figure 11 shows that vertical alignment liquid crystal display device provided by the present invention and existing vertical alignment liquid crystal display device.Wherein Figure 10 is the tint ramp synoptic diagram of existing vertical alignment liquid crystal display device, and Figure 11 is the tint ramp synoptic diagram of the direction matching type LCD device that preferred embodiment of the present invention provided.Angle gamma skew (Gammacurve by viewing angle (offset)) has been shown in Figure 10 and Figure 11, and the ordinate among the figure is penetrance (Transmittance), and horizontal ordinate is gray-scale value (Gray Level).In Figure 10, the tint ramp P of existing vertical alignment liquid crystal display device (for example: its each pixel cell is not divided into other time pixel cell)
1When 60 degree visual angles, with desirable tint ramp I
1Distance is very far away, and existing tint ramp P
1Be not sufficiently oily yet.In Figure 11, the tint ramp Q of direction matching type LCD device provided by the present invention
1When 60 degree visual angles, with desirable tint ramp I
1Distance is very approaching, and when other visual angle also very near desirable tint ramp I
1
In addition, the present invention is not only applicable to the panel module of vertical orientation (VA) type, can be used in the panel module of twisted nematic (TN) type yet, so that multiple domain (Multi-Domain) compensate function to be provided.
By above explanation as can be known, the present invention is divided into pixel cell three times with each pixel cell, the auxiliary capacitor of first time pixel cell is electrically connected with first coupling signal wire that the first coupling electrode signal is provided, the auxiliary capacitor of second pixel cell is electrically connected with the common voltage line that common voltage is provided, and the auxiliary capacitor of the 3rd pixel cell is electrically connected with second coupling signal wire that the second coupling electrode signal is provided.With phase place and voltage level, and utilize common voltage to keep the pixel voltage of second pixel cell, make that the pixel voltage of described pixel cell is all different by the control first coupling electrode signal and the second coupling electrode signal.And then make the angle of inclination of the liquid crystal molecule under described pixel cell differ from one another, to improve the problem of brightness disproportionation under the different visual angles situation.
The foregoing description only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (21)
1. the pixel unit circuit of a vertical alignment liquid crystal display device is characterized in that, comprising:
One first time pixel cell comprises one first auxiliary capacitor, and an end and of described first auxiliary capacitor provides first coupling signal wire of one first coupling electrode signal to be electrically connected;
One second pixel cell comprise one second auxiliary capacitor, and an end and of described second auxiliary capacitor provides the common voltage line of a common voltage to be electrically connected; And
One the 3rd pixel cell comprise one the 3rd auxiliary capacitor, and an end and of described the 3rd auxiliary capacitor provides second coupling signal wire of one second coupling electrode signal to be electrically connected;
Wherein, described first time pixel cell has a pixel voltage for the first time, described second time pixel cell has a pixel voltage for the second time, described the 3rd time pixel cell has a pixel voltage for the third time, and described first time pixel voltage, pixel voltage and pixel voltage is different respectively for the third time for the second time; Described first time the pixel voltage described first coupling electrode signal that is coupled, the described pixel voltage for the third time described second coupling electrode signal that is coupled.
2. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, described first coupling signal wire, second coupling signal wire and common voltage line are identical with the material of one scan line.
3. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 2 is characterized in that, described first time pixel cell also comprises a first film transistor and one first liquid crystal capacitance;
The transistorized source electrode of described the first film is electrically connected with a data line, and the transistorized grid of the first film is electrically connected with described sweep trace, and the first film transistor drain is electrically connected with an end of described first liquid crystal capacitance and the other end of first auxiliary capacitor.
4. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 3, it is characterized in that, described data line provides a data-signal, and the pulse width of the described first coupling electrode signal and the second coupling electrode signal is 1～6 times of described data-signal.
5. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 2 is characterized in that, described second pixel cell also comprises one second thin film transistor (TFT) and one second liquid crystal capacitance;
The source electrode of described second thin film transistor (TFT) is electrically connected with a data line, and the grid of second thin film transistor (TFT) is electrically connected with described sweep trace, and the drain electrode of second thin film transistor (TFT) is electrically connected with an end of second liquid crystal capacitance and the other end of second auxiliary capacitor.
6. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 2 is characterized in that, described the 3rd pixel cell also comprises one the 3rd thin film transistor (TFT) and one the 3rd liquid crystal capacitance;
The source electrode of described the 3rd thin film transistor (TFT) is electrically connected with a data line, and the grid of the 3rd thin film transistor (TFT) is electrically connected with described sweep trace, and the drain electrode of the 3rd thin film transistor (TFT) is electrically connected with an end of the 3rd liquid crystal capacitance and the other end of the 3rd auxiliary capacitor.
7. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, the described first coupling electrode signal and the second coupling electrode voltage of signals are an alternating voltage, and described common voltage is a direct current voltage.
8. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, described first time pixel voltage, for the second time pixel voltage and for the third time pixel voltage be 0.5～2 volt.
9. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, described first coupling electrode signal and the second coupling electrode signal inversion, 180 degree.
10. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, the aperture opening ratio of described first time pixel cell is identical with the aperture opening ratio of the 3rd pixel cell.
11. the pixel unit circuit of vertical alignment liquid crystal display device according to claim 1 is characterized in that, the aperture opening ratio of described first time pixel cell is less than the aperture opening ratio of described the 3rd pixel cell.
12. a vertical alignment liquid crystal display device is characterized in that, comprising:
One first substrate comprises a common conductive layer and an a plurality of protrusion, and described common conductive layer is positioned on described first substrate, and described protrusion is positioned at the part surface of common conductive layer; And
One second substrate comprises a plurality of pixel electrodes, a plurality of first coupling electrode, a plurality of second coupling electrode, a plurality of common electrode and a gate insulator; Described first coupling electrode, second coupling electrode and common electrode are positioned at the part surface of described second substrate, described gate insulator is positioned at the surface of described first coupling electrode, second coupling electrode and common electrode and is positioned at the other parts surface of described second substrate, and described pixel electrode is positioned at the part surface of gate insulator;
Described first substrate and second substrate are formed with a plurality of pixel cells, and each pixel cell comprises:
One first time pixel cell comprises one first auxiliary capacitor, and one of them of described first auxiliary capacitor and described first coupling electrode is electrically connected;
One second time pixel cell comprises one second auxiliary capacitor, and one of them of described second auxiliary capacitor and described common electrode is electrically connected; And
One the 3rd time pixel cell comprises one the 3rd auxiliary capacitor, and one of them of described the 3rd auxiliary capacitor and described second coupling electrode is electrically connected;
Wherein each first coupling electrode is in order to provide one first coupling electrode signal, and each second coupling electrode is in order to provide one second coupling electrode signal, and each common electrode is in order to provide a common voltage; And the pixel voltage of the pixel voltage of the pixel voltage of described first time pixel cell, second pixel cell and the 3rd pixel cell is different respectively; The pixel voltage of described first time pixel cell described first coupling electrode signal that is coupled, the pixel voltage of described the 3rd the pixel cell described second coupling electrode signal that is coupled.
13. vertical alignment liquid crystal display device according to claim 12 is characterized in that, the described first coupling electrode signal and the second coupling electrode voltage of signals are an alternating voltage, and described common voltage is a direct current voltage.
14. vertical alignment liquid crystal display device according to claim 12 is characterized in that, also comprises a liquid crystal layer, between described first substrate and second substrate.
15. vertical alignment liquid crystal display device according to claim 12 is characterized in that, described first substrate also comprises a colored filter, and described colored filter is between first substrate and common conductive layer.
16. vertical alignment liquid crystal display device according to claim 12 is characterized in that, described second substrate also comprises a protective seam, and described protective seam is positioned on the gate insulator, and described pixel electrode is positioned at the part surface of protective seam.
17. vertical alignment liquid crystal display device according to claim 16 is characterized in that, described second substrate also comprises a homeotropic alignment layer, and described homeotropic alignment layer is positioned at the surface of pixel electrode and the other parts surface of protective seam.
18. vertical alignment liquid crystal display device according to claim 12 is characterized in that, the pixel voltage of described first time pixel cell, second pixel cell and the 3rd pixel cell is 0.5～2 volt.
19. vertical alignment liquid crystal display device according to claim 12 is characterized in that, described first coupling electrode signal and the second coupling electrode signal inversion, 180 degree.
20. vertical alignment liquid crystal display device according to claim 12 is characterized in that, the aperture opening ratio of described first time pixel cell is identical with the aperture opening ratio of the 3rd pixel cell.
21. vertical alignment liquid crystal display device according to claim 12 is characterized in that, the aperture opening ratio of described first time pixel cell is less than the aperture opening ratio of described the 3rd pixel cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100930792A CN100468140C (en) | 2006-06-20 | 2006-06-20 | Vertical alignment type liquid crystal display device and pixel unit circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100930792A CN100468140C (en) | 2006-06-20 | 2006-06-20 | Vertical alignment type liquid crystal display device and pixel unit circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1866350A CN1866350A (en) | 2006-11-22 |
| CN100468140C true CN100468140C (en) | 2009-03-11 |
Family
ID=37425358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100930792A Expired - Fee Related CN100468140C (en) | 2006-06-20 | 2006-06-20 | Vertical alignment type liquid crystal display device and pixel unit circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100468140C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101636690B (en) * | 2007-03-15 | 2013-07-03 | 夏普株式会社 | Liquid crystal display device |
| JP4989309B2 (en) | 2007-05-18 | 2012-08-01 | 株式会社半導体エネルギー研究所 | Liquid crystal display |
| KR101542220B1 (en) * | 2007-10-12 | 2015-08-06 | 삼성디스플레이 주식회사 | Liquid crystal display panel |
| US8587739B2 (en) * | 2008-07-15 | 2013-11-19 | Sharp Kabushiki Kaisha | Display device |
| JP2010256420A (en) * | 2009-04-21 | 2010-11-11 | Sony Corp | Liquid crystal display and driving method therefor |
| US8896512B2 (en) * | 2011-08-04 | 2014-11-25 | Sharp Kabushiki Kaisha | Display device for active storage pixel inversion and method of driving the same |
| KR102159682B1 (en) * | 2013-12-13 | 2020-10-15 | 삼성디스플레이 주식회사 | Liquid crystal display |
| US20190206894A1 (en) * | 2017-12-28 | 2019-07-04 | a.u. Vista Inc. | Display systems with non-display areas |
| JP6564503B2 (en) * | 2018-07-30 | 2019-08-21 | 株式会社半導体エネルギー研究所 | Liquid crystal display |
| CN109584840B (en) * | 2019-01-30 | 2020-12-29 | 惠科股份有限公司 | Driving method and device of display panel |
| CN109599075B (en) | 2019-01-30 | 2020-12-15 | 惠科股份有限公司 | Driving method and driving device of display panel and display equipment |
| CN109658893B (en) * | 2019-01-30 | 2021-05-28 | 惠科股份有限公司 | Driving method and driving device of display panel and display equipment |
| JP2019191609A (en) * | 2019-07-25 | 2019-10-31 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| JP6895574B2 (en) * | 2019-07-25 | 2021-06-30 | 株式会社半導体エネルギー研究所 | Transmissive liquid crystal display device |
| JP7201742B2 (en) * | 2020-09-18 | 2023-01-10 | 株式会社半導体エネルギー研究所 | liquid crystal display |
-
2006
- 2006-06-20 CN CNB2006100930792A patent/CN100468140C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1866350A (en) | 2006-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100468140C (en) | Vertical alignment type liquid crystal display device and pixel unit circuit thereof | |
| US7916108B2 (en) | Liquid crystal display panel with color washout improvement and applications of same | |
| CN100461253C (en) | LCD and its driving method | |
| US8031287B2 (en) | Display panel and liquid crystal display including the same | |
| CN100381897C (en) | Vertical oriented liquid crystal display device and its pixel unit circuit | |
| US8537084B2 (en) | Liquid crystal panel and display apparatus including liquid crystal panel | |
| US7830346B2 (en) | Liquid crystal display panel with color washout improvement by scanning line coupling and applications of same | |
| US7319448B2 (en) | Liquid crystal display device and method for driving the same | |
| US8810491B2 (en) | Liquid crystal display with color washout improvement and method of driving same | |
| CN101535883B (en) | Liquid crystal display device | |
| US7764329B2 (en) | MVA LCD device and pixel circuit thereof | |
| CN101281310B (en) | Crystal display device and driving method thereof | |
| US11488555B2 (en) | Display panel, driving method thereof and display apparatus | |
| US8665387B2 (en) | Liquid crystal display | |
| US20110316894A1 (en) | Liquid crystal display device | |
| CN102621730A (en) | Liquid crystal panel | |
| CN101183196A (en) | Pixel structure | |
| US6738107B2 (en) | Liquid crystal display device | |
| JP3054913B2 (en) | Active matrix liquid crystal display | |
| US8766888B2 (en) | In plane switching mode liquid crystal display device | |
| US20100321366A1 (en) | Display device and driving method of the same | |
| US20080122775A1 (en) | Display apparatus | |
| US10796650B2 (en) | Liquid crystal display device and driving method therefor | |
| CN201156137Y (en) | Pixel circuit for vertically oriented schema LCD apparatus | |
| CN217655405U (en) | Array substrate, display panel and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: YOUDA PHOTOELECTRIC CO., LTD. Free format text: FORMER OWNER: GUANGHUI ELECTRONIC CO., LTD. Effective date: 20071130 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20071130 Address after: Hsinchu city of Taiwan Province Applicant after: AU OPTRONICS Corp. Address before: Taoyuan County of Taiwan Province Applicant before: QUANTA DISPLAY INCORPORATION |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 |