CN100472303C - Display device - Google Patents
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- CN100472303C CN100472303C CNB2005100718268A CN200510071826A CN100472303C CN 100472303 C CN100472303 C CN 100472303C CN B2005100718268 A CNB2005100718268 A CN B2005100718268A CN 200510071826 A CN200510071826 A CN 200510071826A CN 100472303 C CN100472303 C CN 100472303C
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Abstract
The level of a storage capacitor line is changed between two types, an H level and an L level. As a result of this change, the voltage applied to a liquid crystal is shifted so that a sufficient voltage is applied to the liquid crystal to perform a display operation. Then, at least one of two voltage levels of the storage capacitor line is used in common with the potential of at least one of plurality of voltage levels which are used in vertical driver which drives the said selection line. Furthermore, the values of the storage capacitance and parasitic capacitance for the storage capacitor line are set within a specific range.
Description
Technical field
The present invention becomes rectangular display device about a kind of with pixel circuit configuration.
Background technology
In the past, but with the low display device of slimming, miniaturization and power consumption, liquid crystal indicator has been well-known, and is adopted to the display of machine of all kinds.This liquid crystal indicator (hereinafter referred to as LCD (Liquid Crtstal Display)) possesses: be formed with the formation of enclosing liquid crystal between the substrate of electrode and fitting in subtend face side respectively at 2.And, between electrode, apply voltage signal, and control changes the orientation of the liquid crystal of optical characteristics according to the orientation state, and then control shows whereby from the penetrance of the light of light source.
At this, when applying DC voltage between the electrode that continues the subtend face side that is formed at substrate, knownly have the problem that the liquid crystal alignment state is fixing so-called ghost and produce.Therefore, be that employing is used as in order to drive the voltage signal of liquid crystal the ac voltage signal that reference voltage is the polar cycle sex reversal in the past.
The mode that this liquid crystal drive voltage signal carries out reversal of poles is known to be had: in liquid crystal indicator with a plurality of pixels of rectangular arrangement, and the counter-rotating of each picture frame (frame), the counter-rotating of each vertical scanning (1V) unit (or 1 figure field (field) unit), the counter-rotating of each horizontal scanning (1H) unit, the counter-rotating of each pixel (1dot) unit.Wherein, 1 picture frame unit is for for example with NTSC (National Television System Committee, (U.S.) National Television System Committee (NTSC)) 1 alleged picture frame unit of signal, 1 figure field unit are the constituent parts (for example odd number figure field and even number figure field) that is equivalent to constitute a plurality of figure field of 1 picture frame.
In Japanese Patent Laid Open Publication 2003-150127 communique, to be that counter-rotating is the most difficult in the aforesaid way impact display quality the point inversion mode that carries out reversal of poles with 1 pixel (point (dot)) unit, and be preferable mode.Yet this mode has type of drive and easily is tending towards complicated problems.
In addition, in Japanese Patent Laid Open Publication 2003-150127 communique, also motion in an inversion mode, the technology contents that will be changed as the voltage of the SC line of the line of the base stage that keeps electric capacity.
Summary of the invention
For improving above-mentioned shortcoming, the invention provides a kind of display device, have the display device that is configured to rectangular image element circuit, each image element circuit possesses:
Pixel TFT, one end are connected in for the data line of data-signal is arranged, and grid is connected in selection wire, and are H level or L level by the selection signal sets with selection wire, and form conducting or not conducting;
Keep electric capacity, the one end is connected in the other end of pixel TFT, and the other end is connected in and keeps the electric capacity line, and keeps the voltage by the data-signal of data line supply; And
Liquid crystal module, one side's electrode are connected in the described other end of pixel TFT, and the opposing party's electrode remains on the common electrode current potential, and to two interelectrode liquid crystal applied voltages,
Described maintenance electric capacity line is when with described pixel TFT conducting, keeps being changed to the 2nd level by the 1st level after the electric capacity and the data-signal on the data line write, and makes the voltage shift that is applied to Liquid crystal module whereby,
Row of corresponding each image element circuit of described maintenance electric capacity line and be provided with two, a plurality of image element circuits that are configured in column direction are connected in two arbitrary of keeping the electric capacity lines, and two keep the electric capacity line traffic controls to make two kinds of current potentials simultaneously,
And the magnitude of voltage of the difference of the 1st level in the described maintenance electric capacity line and the 2nd level is variable.
The present invention also provides a kind of display device, and pixel circuit configuration is become rectangular display device, and each image element circuit possesses:
Pixel TFT, one end are connected in for the data line of data-signal is arranged, and grid is connected in selection wire, and are H level or L level by the selection signal sets with selection wire, and form conducting or not conducting;
Keep electric capacity, the one end is connected in the other end of pixel TFT, and the other end is connected in and keeps the electric capacity line, and keeps the voltage by the data-signal of data line supply; And
Liquid crystal module, one side's electrode are connected in the described other end of pixel TFT, and the opposing party's electrode remains on the common electrode current potential, and to two interelectrode liquid crystal applied voltages,
Described maintenance electric capacity line is when with described pixel TFT conducting, keeps being changed to the 2nd level by the 1st level after the electric capacity and the data-signal on the data line write, and will put on the voltage shift of Liquid crystal module whereby,
Row of corresponding each image element circuit of described maintenance electric capacity line and be provided with two are connected in two arbitrary of keeping the electric capacity lines in a plurality of image element circuits that column direction disposed, and two keep the electric capacity line traffic controls to be made as two kinds of current potentials simultaneously,
And, keep the electric capacity line to be set at identical at described two with the capacitance that the position produced that described data line intersects.
According to the present invention, can be by the magnitude of voltage of the difference of the 1st level in the variable described maintenance electric capacity line and the 2nd level, and adjust contrast and picture brightness.
Therefore, need not to change supply voltage or translation data signal etc., can adjust brightness or contrast etc.
In addition, will keep the capacitance that crossover sites produced of electric capacity line and described data line to be set at roughly the same at described two.Therefore, when keeping the electric capacity lines to carry out voltage reversal for two, the change of the current potential of data line can be dwindled, and the harmful effect that causes for demonstration can be reduced.
Description of drawings
Fig. 1 represents the pie graph of example;
Fig. 2 represents the signal waveforms of electric capacity line SC-A, SC-B;
Fig. 3 represents the normal constitutional diagram that shows voltage shift under black (normally black) situation;
Fig. 4 represents the constitutional diagram of voltage shift under normal whitening (normally white) situation;
Fig. 5 remarked pixel circuit overlook pie graph;
Fig. 6 remarked pixel circuit analyse and observe pie graph;
Fig. 7 represents the permeability variations figure of TN liquid crystal and VA liquid crystal;
Fig. 8 represents the pie graph of SC driver; And
Fig. 9 represents the structure and the action diagram of the pixel of VA pattern.
[primary clustering symbol description]
1 image element circuit
10 pixel TFT
12 Liquid crystal modules
14 keep electric capacity
16 stray capacitances
18 grid capacitances
20 vertical drivers
22 SC drivers
24 voltage generation circuits
26 data-carrier stores
30 pixel electrodes
40 common electrodes
50 orientation cutting parts
60 liquid crystal molecules
100 glass substrates
102 cushions
104 oxide films
106 interlayer dielectrics
108 planarization layers
The DL data line
The GL gate line
SC, SC-A, SC-B keep the electric capacity line
The SCL semiconductor layer
The Vath threshold voltage
Vcom common electrode power supply
VDD, VSS, Vsc (H), Vsc (L) level
Embodiment
Below with reference to the accompanying drawings, example of the present invention is described.
Fig. 1 represents that the summary of this example constitutes.Image element circuit 1 is to be matrix configuration in whole viewing area.Matrix configuration also can be zigzag, but not is clathrate completely.In addition, show to can be black and white that also can be full color (full color), when being full color, pixel generally is RGB three looks, but also can optionally append the pixel of the particular color that comprises white.
As shown in the figure, 1 image element circuit 1 is to have: drain electrode is connected in the n channel pixel TFT (thin film transistor, thin film transistor (TFT)) 10 of data line DL; Be connected in the Liquid crystal module 12 of the source electrode of this pixel TFT 10; And maintenance electric capacity 14.The grid of pixel TFT 10 is the gate lines G L that are connected with by each horizontal scanning line configuration.At this, be bound to produce grid capacitance 18 between the gate-to-source of pixel TFT 10.
In addition, keep in the electric capacity 14, the part that the semiconductor layer that constitutes the source electrode of pixel TFT 10 is extended is direct electrode as a side, is to become counter electrode to the part of the electric capacity line SC that forms relatively across oxide film.Wherein, also the part of the part that becomes the electrode that keeps electric capacity 14 and pixel TFT 10 can be cut off and become indivedual semiconductor layers, and both be connected with metal wiring.
At this, electric capacity line SC has two of SC-A, SC-B etc. for 1 row (horizontal scanning line), and in horizontal scan direction, the maintenance electric capacity of each image element circuit is to be connected in SC-A, SC-B alternately.In the image element circuit shown in this figure left side, keeping electric capacity 14 is to be connected in electric capacity line SC-A, and the maintenance electric capacity 14 of neighbor is to be connected in electric capacity line SC-B.
In addition, in this pixel, though do not connect electric capacity line SC-B, electric capacity line SC-B can be by in the pixel region.Therefore, will produce stray capacitance 16 between the pixel electrode of Liquid crystal module 12 and the electric capacity line SC-B.
Gate lines G L is connected with vertical driver 20, and this vertical driver 20 is to select gate lines G L one by one in regular turn and be made as the H level in each horizontal period.Vertical driver 20 is to have offset buffer (shift register), receive the signal STV of the beginning of expression one vertical scanning period, and the 1st section of offset buffer is made as the H level, afterwards, by for example clock signal, the H level is shifted one by one, can selects the gate lines G L of each horizontal scanning line in regular turn one by one whereby, and be made as the H level.At this, for example the H level of gate lines G L is the VDD current potential, and the L level is the VSS current potential, and these supply voltages VDD, VSS are supplied to vertical driver 20, and mode is set the output of vertical driver whereby, that is the H level of gate lines G L, L level.
That is in this example, SC driver 22 is to receive 2 voltage level Vsc (H), the Vsc (L) that is supplied with from voltage generation circuit 24, controls 2 voltages that keep electric capacity line SC-A, SC-B whereby.In addition, voltage generation circuit 24 is according to the setting data that is stored in data-carrier store 26, and produces Vsc (H), Vsc (L).
Setting data in the data-carrier store 26 is to rewrite according to the setting signal of supplying with from the outside, and will be stored in data-carrier store 26 with the corresponding setting data of setting signal.Voltage generation circuit 24 is according to the setting data that is stored in data-carrier store 26, and produces Vsc (H), Vsc (L).Therefore, can set Vsc (H), Vsc (L) by setting signal.In addition, voltage generation circuit is to utilize Vsc (H), Vsc (L) by VDD and VSS, and uses and to decide voltage generation circuit and produce Vsc (H), Vsc (L).Can utilize resistance to cut apart to wait and form simple formation.
In addition, setting signal can carry out serial transfer (serialtransfer) etc. by the micro computer from the outside, and is stored in data-carrier store 26.
Generally be adjustment button that is provided with contrast (contrast) or brightness etc. in display device, decide setting signal according to its setting value, and this setting signal is stored in data-carrier store 26.
In addition, though icon not also is provided with for example horizontal driver in display device, the video signal of being imported into by the line sequentially feeding for data line DL in order to control (videosignal).That is, be clock pulse (clock) in this example according to the video signal of each pixel, export the sampling clock pulse (sampling clock) of each pixel by horizontal driver, and by this sampling clock pulse, switch (switch) is made as conducting (on) or not conducting (off), and the video signal (data-signal) of a horizontal scanning line part is given breech lock (latch).Then, exporting data-signal to data line DL across a horizontal scan period through each pixel of the relevant horizontal scanning line of breech lock.
In addition, in fact, video signal is that three kinds of RGB are arranged, and each pixel of vertical direction is the whole-colored pixel that becomes arbitrary look among R, G, the B.Therefore, be the data-signal that is set with the arbitrary look of RGB for data line DL.
Then, be to adopt the AC of some inversion mode to apply mode in the device of this example.That is, in each pixel (dot) of horizontal scan direction, the voltage that is applied to the pixel electrode of Liquid crystal module 12 is made as the polarity data-signal opposite with the voltage Vcom of common electrode and is applied.
Fig. 3 left side is depicted as the data-signal according to the 1st polarity, and the triangle hypotenuse that is labeled as Vvideo is represented and the corresponding data-signal of brightness (writing voltage).Data-signal is that the after-applied voltage to pixel electrode that is shifted is to be the center with Vcom by the potential difference (PD) Vb (dynamic range (dynamic range)) of black level to white level, and voltage is white near Vcom person, is black away from Vcom person.Therefore, in this example, white level is Vcom-Vb/2, and black level is Vcom+Vb/2.In addition, in neighbor, shown in Fig. 3 right side, be to become and the 1st opposite polarity the 2nd polarity, white level is Vcom+Vb/2, black level is Vcom-Vb/2.
Then, as shown in Figure 2, with pixel TFT 10 conductings, and after data being write finish dealing with, electric capacity line SC-A, SC-B are that displacement reaches to predetermined voltage Δ Vsc.In this example, liquid crystal is to use the TN type (Twisted Nematic, stable twisted nematic) of normal whitening (normally white).About the pixel in Fig. 3 left side, be to be connected with electric capacity line SC-A, Vsc reaches to voltage Δ Vsc towards the higher direction displacement of voltage.In addition, about the pixel on Fig. 3 right side, be to be connected with electric capacity line SC-B, Vsc reaches to voltage Δ Vsc towards the lower direction displacement of voltage.
Mode whereby, as shown in Figure 3, the data-signal that is applied to pixel electrode be displacement reach to the corresponding voltage of Δ Vsc, and it is put on and Vcom between.At this, Δ Vsc be set for corresponding to the voltage that applies the threshold voltage Vath that the corresponding penetrance of voltage begins to change of liquid crystal, and, can carry out the demonstration of being undertaken by Liquid crystal module 12 by the voltage after the displacement.In addition, the dynamic range of data-signal is to set the dynamic range that makes after the displacement for to become the potential difference (PD) from black level to white level in showing.
Wherein, in Fig. 3, Va (W) is the shift amount of the data-signal of white level, and Va (B) is the shift amount of the data-signal of black level.Therefore, these shift amounts are determined by Δ Vsc.In addition, Vb is the potential difference (PD) (dynamic range) of the black level and the white level of data-signal, and Vb ' is the dynamic range after the displacement.
At this, (VerticalAlign in the time of VA), is as shown in Figure 4 when the vertical orientation type that uses normal apparent black (normally black).As mentioned above, data-signal is the potential difference (PD) Vb (dynamic range) from black level to white level, and the after-applied voltage to pixel electrode that is shifted is to be the center with Vcom, and voltage for black, is white away from Vcom person near Vcom person.Therefore, in this example, black level is Vcom-Vb/2, and white level is Vcom+Vb/2.In addition, in neighbor, shown in Fig. 4 right side, become and the 1st opposite polarity the 2nd polarity, black level is Vcom+Vb/2, and white level is Vcom-Vb/2.
At this, the magnitude of voltage Vpixel of the pixel electrode of the Liquid crystal module 12 after the displacement is shown below.
Vpixel＝Vvideo±{(Csc-Cpa)/(Cgs+Clc+Csc+Cpa)}.ΔVsc (1)
In this example, be the liquid crystal that utilizes the normal whitening of TN type.Therefore, deceive demonstration by applying voltage.The black level voltage with respect to Vcom after displacement is VB, when writing fashionable dynamic range and being Vb, in order to deceive demonstration, must satisfy following formula.
{(Csc-Cpa)/(Cgs+Clc+Csc+Cpa)}.ΔVsc＝VB-Vb/2 (2)
That is Vb/2 is equivalent to when writing the fashionable black level voltage for Vcom, and VB is the black level voltage after the displacement, so VB-Vb/2 promptly becomes shift voltage.
In addition, image element circuit is to move according to supply voltage VDD.Therefore, to be lower than VDD be operation condition to shift voltage Δ Vsc.
ΔVsc<VDD (3)
Therefore, must form image element circuit in the mode that satisfies these (2), (3) formula.
On the other hand, if decision panel size, pixel count, the liquid crystal that utilized, then the capacitance Clc of Liquid crystal module 12 can determine.In addition, if the size of decision pixel TFT 10, then the grid capacitance Cgs of pixel TFT 10 can determine.Therefore, can not carry out bigger change in the design phase of display panel.
Therefore, in this example, be that change keeps the capacitance Csc of electric capacity 14 and the capacitance Cpa of stray capacitance 16.That is, if the capacitance Csc that keeps electric capacity 14 than the capacitance Cpa of stray capacitance 16 greater than certain more than the ratio, even if Δ Vsc is set for less, also can satisfy (2) formula, therefore also can satisfy (3) formula.Then, by reducing Δ Vsc, can reach the purpose that low power consumption quantizes.
In addition, the mode that is not more than VDD with Δ Vsc decides Cpa, can avoid being provided with special power supply whereby and be used as the Vsc voltage generation circuit.In addition, can obtain reaching low power consumption and quantize, promote advantages such as pixel aperture ratio.
In addition, be to be made as the height identical with stray capacitance 16 with grid, and pixel electrode between be to have interlayer dielectric and planarization film.By this planarization film of thickening, can reduce stray capacitance 16.On the other hand, keep electric capacity 14, can make the grid oxidation film attenuation in order to strengthen.In addition, change keeps the area of electric capacity 14, also can be easy to change the capacitance that keeps electric capacity 14.With above-mentioned gimmick, can adjust the capacitance that keeps electric capacity 14, stray capacitance 16.
Concrete example
When constituting: when Csc=320fF, Cpa=10fF, Clc=430fF, Cgs=3fF, Δ Vsc=5.58, Vb=3.5V, Vb=2.5V, the VDD=8.5V left and right sides, then become { (320-Cpa)/(3+430+320+Cpa) }. Δ Vsc=3.5-2.5/2.And, Δ Vsc＜8.5.
Therefore, can export as Cpa＜95fF about the capacitance of stray capacitance 16 this moment.
For example, when not satisfying this condition, and Cpa is when to be 95fF above, and it is not enough that shift voltage will become, and can't fully carry out and black level is shown.
In addition, the magnitude of voltage Vpixel of the pixel electrode of the Liquid crystal module after the displacement 12 represents as shown in the formula (identical with above-mentioned (1) formula).
Vpixel＝Vvideo±{(Csc-Cpa)/(Cgs+Clc+Csc+Cpa)}.ΔVsc
At this, Cgs, Cpa＜＜when Csc, Clc, Vpixel is as follows.
Vpixel≒Vvideo±Csc/(Clc+Csc).ΔVsc
In addition, the TN liquid crystal is not applying under the state of voltage, and molecule can be towards the direction that is parallel to electrode, the DIELECTRIC CONSTANT of this moment
‖Can be less than being applied with under the state of voltage, the DIELECTRIC CONSTANT of molecule towards the time perpendicular to the direction of electrode
⊥That is, ε
⊥ε
‖In addition, the capacitance Clc of Liquid crystal module decides according to the specific inductive capacity of liquid crystal material, therefore, and Clc
⊥Clc
‖
This example is the liquid crystal that utilizes the normal whitening of TN type.Therefore, deceive demonstration by applying voltage.When the black level voltage for Vcom after the displacement is VB, to write fashionable dynamic range be that the voltage shift amount of Vb, black level is the voltage shift amount of Va (B), white level when being Va (W), Va (B), Va (W) are as follows.
Va(B)＝Csc/(Clc
⊥+Csc).ΔVsc
Va(W)＝Csc/(Clc
‖+Csc).ΔVsc
Therefore, Va (W)〉Va (B).
In addition, the dynamic range Vb ' after the displacement is as follows.
Vb’＝Vb-{Va(W)-Va(B)}
Therefore, Vb '＜Vb
By above-mentioned relation as can be known, the size by changing Δ Vsc can change Va (B), Va (W) and Vb '.
In this example, as mentioned above, change Vsc (H), Vsc (L) according to setting signal, and then change both poor, that is Δ Vsc.Then, by changing this Δ Vsc, adjust brightness and contrast.That is, owing to Va (B), Va (W) change, so brightness changes; Because Vb ' changes,,, can carry out the adjustment of brightness and contrast by adjusting Δ Vsc so contrast changes.
In addition, image element circuit is to move according to supply voltage VDD.Therefore, shift voltage Δ Vsc is preferably lower than VDD, and preferably satisfies Δ Vsc＜VDD.
Formation overlooked in the summary that shows display panel among Fig. 5.As shown in the drawing, (vertical scanning) direction of being expert at is configured in each row with data line DL, in row (horizontal scanning) direction, keeps electric capacity line SC-A, SC-B to be configured in each row with two.
In figure,, be not must be like this though data line DL is the linearity of same width.When using data line DL, preferably live width is strengthened about this position for the shading between pixel.In addition, when δ (delta) type is arranged, the data line DL bending that is bound to.
In addition, among electric capacity line SC-A, the SC-B, it is broad to form the part that keeps electric capacity 14, and guarantees electric capacity.Moreover in this example, the part of neighbor also is used as keeping electric capacity 14.That is, make among the figure to form the semiconductor layer (electrode that keeps the opposition side of electric capacity line SC-A) that keeps electric capacity 14 in the pixel in left side and extend to neighbor, make between pixel whereby and the part of neighbor also is used as the maintenance electric capacity 14 of pixel own.In addition, as described later, the lower portion of data line also is used as a part that keeps electric capacity 14.
In addition, diminish, preferably only make this part dwindle live width in order to make the data line DL and the area of the cross section that keeps electric capacity line SC-A, SC-B.
Then, make these two maintenance electric capacity line SC-A and SC-B identical with the area that data line DL intersects.Mode whereby, keep electric capacity line SC-A, SC-B to become identical with the capacitance of the stray capacitance that data line DL constitutes, and when keeping electric capacity line SC-A, SC-B counter-rotating, can make the change of current potential of data line DL less, and can reduce the harmful effect that demonstration is caused.
Fig. 6 represents to dispose 1 cut-open view that keeps the part of electric capacity line SC.As shown in the drawing, be to be provided with cushion 102 on glass substrate 100, and be provided with semiconductor layer SCL in this cushion 102.Though this semiconductor layer SCL forms pixel TFT 10 etc., the part of icon then is to form the part that keeps electric capacity 14.Be to be formed with oxide film 104 on semiconductor layer SCL.This oxide film 104 is to form with the manufacture process identical with the grid oxidation film of pixel TFT 10.Then, on this grid oxidation film 104, form maintenance electric capacity line SC.This maintenance electric capacity line SC forms with the manufacture process identical with the grid of pixel TFT 10.
Keeping on the electric capacity line SC is to be formed with interlayer dielectric 106, and is formed with data line DL on this interlayer dielectric 106.
Moreover, coat data line DL and form planarization layer 108, and on this planarization layer 108, form pixel electrode 30.Wherein, though icon not is to be provided with liquid crystal layer across alignment film, and disposes the subtend substrate that forms common electrode on this liquid crystal layer, and liquid crystal is given double team on this pixel electrode 30.
So, keep electric capacity line SC and data line DL be in cross section across interlayer dielectric 106 and relative to.Therefore, can produce electric capacity in this part.Wherein, in this example, semiconductor layer SCL extends to the below of cross section, and this part also is used as a part that keeps electric capacity 14.
In addition, represent among Fig. 7 that TN liquid crystal and VA liquid crystal are for the penetrance that applies voltage.If during the TN liquid crystal, when making the voltage that is applied to liquid crystal continue to rise, the initial breakthrough rate is fixing high level (white level), but when the voltage that is applied to liquid crystal during greater than threshold voltage, penetrance promptly can begin to reduce, afterwards, penetrance promptly reduces with fixing ratio, and becomes fixing low level (black level).On the other hand, if during the VA liquid crystal, when making the voltage that is applied to liquid crystal continue to rise, the initial breakthrough rate is fixing low level (white level), but when the voltage that is applied to liquid crystal during greater than threshold voltage, penetrance promptly can begin to increase, afterwards, penetrance promptly increases with fixing ratio, and becomes fixing high level (white level).
In addition, as shown in Figure 7, in TN liquid crystal and the VA liquid crystal, show required voltage scope (dynamic range) though difference in this example, can be adjusted voltage range by change △ Vsc.
In this example, be in SC driver 22, to be used for supply voltage VDD, the VSS of vertical driver 20 or input to the voltage of panel, utilize H level voltage (Vsc (H)) and/or L level voltage (Vsc (L)) in electric capacity line SC (SC-A or SC-B).Wherein, for vertical driver 20, except VDD, VSS, also supply with the GND current potential.That is vertical driver 20 is the offset buffers that have in order to driving grid line GL, and utilizes the GND current potential in this offset buffer.Therefore, the either party that also this GND current potential can be utilized at H level voltage (Vsc (H)) or L level voltage (Vsc (L)).Moreover, so long as input to the current potential of panel, even other current potential also can be used.Therefore, in SC driver 22,, also can utilize the current potential that is used in the vertical driver 20 for H level voltage (Vsc (H)) and L level voltage (Vsc (L)) both sides.Wherein, in the following description, basically, be that to utilize VDD or VSS with the side for the H level voltage (Vsc (H)) of SC driver 22 or L level voltage (Vsc (L)) be that example is illustrated.
That is, as shown in Figure 8,, will be supplied to the control end of switch SW 1, SW2 for the display control signal of H level in supplying with the H level during the electric capacity line SC.Switch SW 1, SW2 form n channel TFT and p channel TFT formation in parallel respectively, the grid of the p channel TFT of switch SW 1 is connected with the grid of the n channel TFT of switch SW 2, supply with the signal that display control signal is reversed with phase inverter (inverter) at this, and display control signal is supplied to the grid of the p channel TFT of the grid of n channel TFT of switch SW 1 and switch SW 2.In addition, be to import for example VDD or Vsc (H) for the input point of switch SW 1, be input Vsc (L) or VSS for the input point of switch SW 2.Then, the output point of switch SW 1, SW2 is to be connected in electric capacity line SC-A or SC-B.
That is, for SC driver 22, in order to drive electric capacity line SC-A, SC-B, and 2 voltages need be arranged, and in this example, be that wherein 1 or 2 is made as VDD or the VSS that is used for vertical driver 20.For example, when utilizing Vsc (L), the H level is made as VDD, when the H level utilizes Vsc (H), then the L level is made as VSS or inputs to the voltage of panel in the L level.Therefore, in the display device, as long as produce the either party of Vsc (H) or Vsc (L), perhaps both all do not need, and therefore can simplify power circuit.In addition, SC driver 22 is closely to connect vertical driver 20 and establish, therefore, and can be shorter with being input to the VDD of vertical driver 20 or distribution that VSS inputs to SC driver 22.
Wherein, circuit shown in Figure 8 is to be provided with 1 for 1 electric capacity line SC (SC-A or SC-B), and for VDD decision Vsc (L), or for VSS decision Vsc (H), so that for example the difference of H level and L level is Δ Vsc.
Then, according to the circuit of this Fig. 8, when display control signal was the H level, switch SW 1 was conducting, and exported for example Vsc (H); And when display control signal was the L level, then switch SW 2 was conducting, and exported for example Vss.
At this, the structure and the action of the pixel of the VA mode display device that uses the VA liquid crystal are described according to Fig. 9 (a) to (c).
Fig. 9 (a) and (b) figure represents to use the general profile chart of the VA mode LCD (LCD) of VA liquid crystal, and expression is along having the example of analysing and observe structure of A-A line that the LCD of structure overlooked in summary shown in Fig. 9 (c).In this LCD, alignment film generally is to adopt not bestow the non-the friction type that (rubbing treatment) handled in friction.Therefore, the initial stage orientation of liquid crystal is not tilted (pre-tilt) in advance, applies under the state in that voltage is non-, and the long axis direction of liquid crystal molecule is towards the substrate normal direction and orientation.The initial stage orientation becomes the liquid crystal molecule 60 of vertical direction shown in Fig. 9 (a) and Fig. 9 (b), when beginning to apply voltage between for the common electrode 40 of LCD and pixel electrode 30, the weak electric field (line of electric force that is represented by dotted lines in reference to figure (electric line of force)) that is produced under the lower state of initial voltage is the oblique inclinations such as end at pixel electrode 30, and stipulate along with voltage rises the orientation that liquid crystal molecule falls down thereupon by this oblique electric field.
Wherein, for example in 1 pixel region, as shown in the figure, orientation cutting part 50 is set respectively earlier, can in the multizone in 1 pixel region, be divided into different respectively orientation whereby.At 9 figure (a) to the example of (c), this orientation cutting part 50 is can be by on zone (window) or electrode jut not being set at electrode and constituting, and to be the pattern (pattern) that polyline shaped extends and to be formed on common electrode 40 and pixel electrode 30 both sides in the vertical direction of picture respectively.In addition, be not limited to above-mentioned pattern, for example also can be by in 1 pixel region, the upper end of long side direction and lower end are divided into the patterns of 2 forks and electrode is set does not constitute at zone (window) or jut.By above-mentioned orientation cutting part 50, shown in 9 figure (a), Fig. 9 (b), be the border in the LCD alignment orientation in 1 pixel to be fixed on this cutting part 50, to drive sequential in each pixel or each all inequality and cause and show the harmful effect that causes for display quality such as uneven for the boundary position of orientation in pixel and can prevent liquid crystal molecule to fall down.
In addition, in this example, can be used in following arbitrary type LCD: only show, all adopt tin indium oxide (indium tin oxide, the infiltration type LCD of the transparent property led electrode such as ITO) for pixel electrode and common electrode both sides with the light that is disposed at panel light source behind etc.; Use the reflective metals electrode as pixel electrode, and will be reflected from the light of outer light and the reflection type LCD that shows; Moreover when using light source, be the pattern of penetrating, the semi-transmission type LCD that when closing light source, then plays a role for reflective-mode.In reflection type LCD or semi-transmission type LCD etc., though can reach the lifting of better contrast etc., shown in this example, by carrying out reversal of poles, even be the reflection-type or the semi-transmission type LCD of for example ecb mode, can also be very high to recently showing.
Claims (8)
1. display device has and is configured to rectangular image element circuit, and each image element circuit possesses:
Pixel TFT, one end are connected in for the data line of data-signal is arranged, and grid is connected in selection wire, and are H level or L level by the selection signal sets with selection wire, and form conducting or not conducting;
Keep electric capacity, the one end is connected in the other end of pixel TFT, and the other end is connected in and keeps the electric capacity line, and keeps the voltage by the data-signal of data line supply; And
Liquid crystal module, one side's electrode are connected in the described other end of pixel TFT, and the opposing party's electrode remains on the common electrode current potential, and to two interelectrode liquid crystal applied voltages,
When with described pixel TFT conducting, and the data-signal on the data line write keep after the electric capacity, described maintenance electric capacity line is changed to the 2nd level by the 1st level, the voltage that is applied to Liquid crystal module is shifted reaches to predetermined voltage Δ V
Sc,
Row of corresponding each image element circuit of described maintenance electric capacity line and be provided with two, a plurality of image element circuits that are configured in column direction are connected in two arbitrary of keeping the electric capacity lines, and two keep the electric capacity line traffic controls to make two kinds of current potentials simultaneously,
And by changing described the 1st level and/or the 2nd level that respectively keeps in the electric capacity line, the described predetermined voltage Δ V of variable difference as the 1st level and the 2nd level
Sc
2. display device according to claim 1, wherein, described display device has: the voltage generation circuit that produces the voltage of the 1st level of described maintenance electric capacity line and the 2nd level; And in order to the data-carrier store of the value that stores the voltage produced,
And described voltage generation circuit is according to the data by data-carrier store output, decides the value of the voltage of the 1st level that produced and the 2nd level.
3. display device according to claim 2, wherein, described data-carrier store is output data according to the setting signal of being imported.
4. display device according to claim 3, wherein, described setting signal is according to the display brightness of display device or contrast and determine.
5. display device according to claim 1, wherein, in described two kinds of current potentials, when a side current potential was shifted by just past negative direction or by negative past positive direction, the opposing party's current potential was past its reverse direction displacement.
6. display device according to claim 1 wherein, keeps the electric capacity line to be set at identical with the capacitance that the position produced that described data line intersects at described two.
7. display device according to claim 1, wherein, described two keep the electric capacity line identical with the area of the crossover sites of described data line.
8. display device according to claim 1, wherein, described two keep the electric capacity line, and in being connected with the pixel inside of image element circuit, its area is through enlarging.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004152485 | 2004-05-21 | ||
| JP2004152489 | 2004-05-21 | ||
| JP2004152485 | 2004-05-21 | ||
| JP2004152493 | 2004-05-21 | ||
| JP2004152497 | 2004-05-21 |
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| CN1700078A CN1700078A (en) | 2005-11-23 |
| CN100472303C true CN100472303C (en) | 2009-03-25 |
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| CNB2005100718268A Expired - Fee Related CN100472303C (en) | 2004-05-21 | 2005-05-20 | Display device |
| CN2008100088356A Expired - Fee Related CN101241286B (en) | 2004-05-21 | 2005-05-23 | Display device |
| CNB200510072216XA Expired - Fee Related CN100437731C (en) | 2004-05-21 | 2005-05-23 | Display device |
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| CN2008100088356A Expired - Fee Related CN101241286B (en) | 2004-05-21 | 2005-05-23 | Display device |
| CNB200510072216XA Expired - Fee Related CN100437731C (en) | 2004-05-21 | 2005-05-23 | Display device |
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| CN100389357C (en) * | 2006-04-21 | 2008-05-21 | 友达光电股份有限公司 | LCD device |
| CN101354870B (en) * | 2007-07-24 | 2010-06-02 | 北京京东方光电科技有限公司 | TFT-LCD control method |
| CN101770750B (en) * | 2008-12-26 | 2012-01-25 | 北京京东方光电科技有限公司 | Liquid crystal display and control method thereof |
| CN102222456B (en) * | 2010-04-16 | 2013-05-29 | 北京京东方光电科技有限公司 | Common electrode driving method, circuit and liquid crystal displayer |
| JP2012195509A (en) * | 2011-03-17 | 2012-10-11 | Canon Inc | Semiconductor device and manufacturing method of the same |
| KR102099262B1 (en) | 2012-07-11 | 2020-04-09 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Liquid crystal display device and method for driving the same |
| CN103698927B (en) | 2013-12-31 | 2017-05-10 | 敦泰电子有限公司 | touch display device, drive circuit and drive method |
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| JPH09113933A (en) * | 1995-10-19 | 1997-05-02 | Matsushita Electric Ind Co Ltd | Thin-film transistor liquid crystal display element |
| JP2000081606A (en) * | 1998-06-29 | 2000-03-21 | Sanyo Electric Co Ltd | Method for driving liquid crystal display element |
| JP2001188217A (en) * | 1999-10-20 | 2001-07-10 | Sharp Corp | Active matrix liquid crystal display device, and driving method and manufacturing method therefor |
| JP2004046180A (en) * | 2000-04-28 | 2004-02-12 | Sharp Corp | Display device and electronic device provided therewith |
| JP3960780B2 (en) * | 2001-11-15 | 2007-08-15 | 三洋電機株式会社 | Driving method of active matrix display device |
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| CN101241286A (en) | 2008-08-13 |
| CN100437731C (en) | 2008-11-26 |
| CN101241286B (en) | 2010-06-09 |
| CN1700078A (en) | 2005-11-23 |
| CN1700293A (en) | 2005-11-23 |
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