CN1700293A - Display device - Google Patents
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- CN1700293A CN1700293A CN 200510072216 CN200510072216A CN1700293A CN 1700293 A CN1700293 A CN 1700293A CN 200510072216 CN200510072216 CN 200510072216 CN 200510072216 A CN200510072216 A CN 200510072216A CN 1700293 A CN1700293 A CN 1700293A
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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 relates to a kind of pixel circuit configuration be become rectangular display device.
Background technology
In the past, but with regard to slimming, miniaturization and display device low in energy consumption, liquid crystal indicator has been well-known, and is used to the display of machine of all kinds.Liquid crystal indicator (hereinafter referred to as LCD) possesses: be formed with the formation of enclosing liquid crystal between the substrate of electrode and fitting in subtend face side respectively at two.And, between electrode, apply voltage signal, and control changes the aligning of the liquid crystal of optical characteristics according to alignment, 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 molecule alignment is fixing so-called ghost and produce.Therefore, adopted the ac voltage signal that reference voltage is the polar cycle sex reversal to be used as in order to drive the voltage signal of liquid crystal 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 the counter-rotating of the counter-rotating of each frame, each vertical scanning (1V) unit (or one scan field unit), the counter-rotating of each horizontal scanning (1H) unit, each pixel (a bit) unit.Wherein, one frame unit is for for example with (the National Television System Committee of NTSC, NTSC) the alleged frame unit of signal, one scan field unit are equivalent to constitute the constituent parts (for example odd number scanning field and even-line interlace field) of a plurality of scanning fields of a 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 a pixel (point) unit, and be preferred 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
In the present invention, when changing to the level that keeps the electric capacity line, the current potential of at least one level is wherein shared with at least one current potential of H level that is used for data line and L level.Therefore, can reach for the circuit of the usefulness that produces supply voltage or draw purpose around the efficient activity of distribution.
In addition, will or keep the capacitance of electric capacity to be set in the particular range for the stray capacitance that keeps the electric capacity line.The stray capacitance that the maintenance electric capacity line of mode whereby, the may command circuit by not being connected in pixel own is produced is brought dysgenic situation to action, and can carry out circuit operation really.
Description of drawings
Fig. 1 represents the pie graph according to the embodiment of the invention;
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
The structure and the action diagram of the pixel of Fig. 9 (a) to (c) expression VA pattern.
Embodiment
Below with reference to the accompanying drawings, embodiments of the invention are described.
Fig. 1 represents that summary constitutes according to an embodiment of the invention.Image element circuit 1 is matrix configuration in whole viewing area.Matrix configuration also can be zigzag, rather than clathrate completely.In addition, show to can be black and white that also can be 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, an image element circuit 1 has: drain electrode is connected in the n channel pixel thin film transistors (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 connected with the gate lines G L 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 becomes counter electrode to the part of the electric capacity line SC that forms directly as a side electrode 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 delegation's (horizontal scanning line), and in horizontal scan direction, the maintenance electric capacity of each image element circuit is connected in SC-A, SC-B alternately.In the image element circuit shown in this figure left side, keep electric capacity 14 to be connected in electric capacity line SC-A, the maintenance electric capacity 14 of neighbor is 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 selected gate lines G L one by one in regular turn and is made as the H level in each horizontal period.Vertical driver 20 has shift register, receive the signal STV of the beginning of expression one vertical scanning period, and first section of shift register 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 the present embodiment, SC driver 22 receives two voltage level Vsc (H), the Vsc (L) that is supplied with from voltage generation circuit 24, controls two 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 generation Vsc (H), Vsc (L).
Setting data in the data-carrier store 26 can be rewritten 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 generation Vsc (H), Vsc (L).Therefore, setting signal be can pass through, Vsc (H), Vsc (L) set.In addition, voltage generation circuit utilizes 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 etc. by the micro computer from the outside and is stored in data-carrier store 26.
Operated by rotary motion has the adjustment button of contrast or brightness etc. in display device, decides setting signal according to its setting value, and this setting signal is stored in data-carrier store 26.
In addition, though not shown, in display device, also be provided with for example horizontal driver, in order to control the vision signal of being imported into by the line sequentially feeding for data line DL.That is, in this example according to the clock of the vision signal of each pixel, export the sampling clock of each pixel by horizontal driver, and by this sampling clock, switch is made as conducting or not conducting, and the vision signal (data-signal) of a horizontal scanning line part is latched.Then, the data-signal with each pixel of the relevant horizontal scanning line through latching is exporting data line DL to across a horizontal scan period.
In addition, in fact, vision signal has three kinds of RGB, and each pixel of vertical direction becomes the whole-colored pixel of arbitrary look among R, G, the B.Therefore, be set with the data-signal of the arbitrary look of RGB for data line DL.
Then, in the device of present embodiment, adopt the AC of some inversion mode to apply mode.That is, in each pixel (point) 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 public electrode and is applied.
Fig. 3 left side is depicted as the data-signal according to first polarity, and the triangle hypotenuse that is labeled as Vvideo is represented and the corresponding data-signal of brightness (writing voltage).Data-signal is by the potential difference (PD) Vb (dynamic range) of black level to white level, and the after-applied voltage to pixel electrode that is shifted is the center with Vcom, 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, become and first opposite polarity second polarity, white level is Vcom+Vb/2, and 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, more than electric capacity line SC-A, the SC-B displacement predetermined voltage Δ Vsc.In this example, liquid crystal is with the stable twisted nematic (Twisted Nematic, TN type) of normal whitening (normally white).Pixel about Fig. 3 left side is connected with electric capacity line SC-A, and Vsc is more than the higher direction shift voltage Δ Vsc of voltage.In addition, about the pixel on Fig. 3 right side, be connected with electric capacity line SC-B, Vsc is more than the lower direction shift voltage Δ Vsc of voltage.
Mode whereby, as shown in Figure 3, the data-signal displacement that is applied to pixel electrode more than the corresponding voltage of Δ Vsc, and it is put on and Vcom between.At this, Δ Vsc 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 set the dynamic range that makes after the displacement for becomes the potential difference (PD) from black level to white level in demonstration.
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 being shifted.
At this, (VerticalAlign is in the time of VA), as shown in Figure 4 when the perpendicular alignmnet 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 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 first opposite polarity second 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 the present embodiment, utilize the liquid crystal of 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 being shifted, so VB-Vb/2 promptly becomes shift voltage.
In addition, image element circuit moves 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 the present embodiment, 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, stray capacitance 16 is made as the height identical with grid, and pixel electrode between have interlayer dielectric and planarization film.By thickening this planarization film, 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.
VpixelVvideo±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, and the DIELECTRIC CONSTANT ‖ of this moment can be less than being applied with under the state of voltage, the DIELECTRIC CONSTANT ⊥ of molecule towards perpendicular to the direction of electrode the time.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 ‖.
Present embodiment utilizes the liquid crystal of 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, by changing the size of Δ Vsc, can change Va (B), Va (W) and Vb '.
In the present embodiment, 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 moves 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, in row (vertical scanning) direction, data line DL is configured in each row, (horizontal scanning) direction of being expert at keeps electric capacity line SC-A, SC-B to be configured in each row with two.
In the drawings, though data line DL is the linearity of same width, be not must be like this.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 a cut-open view that keeps the part of electric capacity line SC.As shown in the drawing, on glass substrate 100, be provided with cushion 102, and on this cushion 102, be provided with semiconductor layer SCL.Though this semiconductor layer SCL forms pixel TFT 10 etc., the part that illustrates then is to form the part that keeps electric capacity 14.On semiconductor layer SCL, be formed with oxide film 104.This oxide film 104 forms with the processing procedure identical with the grid oxidation film of pixel TFT 10.Then, on this grid oxidation film 104, form maintenance electric capacity line SC.This keeps electric capacity line SC to form with the processing procedure identical with the grid of pixel TFT 10.
Keeping being formed with interlayer dielectric 106 on the electric capacity line SC, and on this interlayer dielectric 106, be formed with data line DL.
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 provided with liquid crystal layer across aligning film on this pixel electrode 30, and disposes the subtend substrate that forms public electrode on this liquid crystal layer, and liquid crystal is given double team.
So, keep electric capacity line SC and data line DL 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 the present embodiment, can be adjusted voltage range by change Δ Vsc.
In the present embodiment, 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 has the shift register in order to driving grid line GL, and utilizes the GND current potential in this shift register.Therefore, also this GND current potential can be utilized as the either party of 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 supplying with the H level during the electric capacity line SC.Switch SW 1, SW2 form the n channel TFT formation in parallel with the p channel TFT 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 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, import for example VDD or Vsc (H), for the input point input Vsc (L) or the VSS of switch SW 2 for the input point of switch SW 1.Then, the output point of switch SW 1, SW2 is 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 two voltages need be arranged, and in the present embodiment, one of them or two are 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 at 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 provided with one for an 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 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, is expression 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, the non-the friction type that (rubbing treatment) handled in friction is not bestowed in the general employing of aligning film.Therefore, the initial stage of liquid crystal does not aim to tilt (pre-tilt) in advance, applies under the state in that voltage is non-, and the long axis direction of liquid crystal molecule is aimed at towards the substrate normal direction.Initial stage is aligned to 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 public 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) that is produced under the lower state of initial voltage is in the oblique inclinations such as end of 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 a pixel region, as shown in the figure, be provided with respectively earlier and aim at cutting part 50, whereby can a plurality of zones in a pixel region in, be divided into different respectively orientation.At Fig. 9 (a) to the example of (c), this aligning cutting part 50 can constitute by on zone (window) or electrode jut not being set at electrode, and to be the pattern that polyline shaped extends and to be formed on public 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 a pixel region, the pattern that the upper end of long side direction and lower end divaricate and electrode is set not in zone (window) or jut and constituting.By above-mentioned aligning cutting part 50, shown in Fig. 9 (a), Fig. 9 (b), the border in the liquid crystal alignment orientation in one pixel can 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 the present embodiment, 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 public 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 lifting of better contrast etc., as shown in this embodiment, by carrying out reversal of poles, even be the reflection-type or the semi-transmission type LCD of for example ecb mode, also can be very high to recently showing.
Claims (7)
1. a display device is that pixel circuit configuration is become rectangular display device, and each image element circuit possesses:
Pixel TFT, one end are connected in accepts the data line that data-signal is supplied with, and grid is connected in selection wire, and is H level or L level by the selection signal sets with selection wire, and forms 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, in order to keep the voltage by the data-signal of data line supply; And
Liquid crystal module, one side's electrode are connected in the aforementioned other end of pixel TFT, and the opposing party's electrode remains on the public electrode current potential, and to two interelectrode liquid crystal applied voltages,
Aforementioned maintenance electric capacity line is when with aforementioned pixel TFT conducting, keeps being changed to second level by first level after the electric capacity and the data-signal on the data line write,
And at least one side of aforementioned first level and second level is with shared in order to a voltage level in employed a plurality of voltage levels in the vertical driver that drives aforementioned selection wire.
2. display device according to claim 1 wherein, is that supply is two kinds of opposite data-signals with respect to aforementioned public electrode polarities of potentials for the aforementioned data line,
Corresponding the going of each image element circuit of aforementioned maintenance electric capacity line and be provided with two, a plurality of image element circuits that are configured in line direction are connected in two arbitrary of keeping the electric capacity lines, and simultaneously aforementioned two keep the electric capacity lines to be controlled so as to two kinds of current potentials,
The current potential of aforementioned two maintenance electric capacity lines is in each image element circuit, sets according to the aforementioned data signal of being supplied with.
3. display device according to claim 2, wherein, in aforementioned two kinds of current potentials, when a side current potential by just toward negative direction, or by negative during toward positive direction displacement, the opposing party's current potential is toward its reverse direction displacement.
4. display device according to claim 2, wherein, aforementioned two each image element circuits that keeps the electric capacity line to be connected in line direction alternately.
5. display device according to claim 2, wherein, if: the capacitance of aforementioned maintenance electric capacity is Csc, capacitance in the stray capacitance that node produced of aforementioned maintenance electric capacity line that is connected in neighboring pixel circuits and aforementioned pixel electrode is Cpa, capacitance in the grid capacitance that node produced of the grid of aforementioned pixel TFT and aforementioned pixel electrode is Cgs, the capacitance of foregoing liquid crystal assembly is Clc, the magnitude of voltage that is shifted in aforementioned maintenance electric capacity line is Δ Vsc, the black level voltage of aforementioned data signal and the potential difference (PD) of white level voltage are Vcont, black level voltage after the voltage shift is VB, when supply makes the supply voltage of power supply of the electric power of image element circuit action be VDD, satisfy following (i), (ii) formula:
{(Csc-Cpa)/(Cgs+Clc+Csc+Cpa)}·ΔVsc＝VB-Vcont/2 (i)
ΔVsc＜VDD (ii)。
6. a display device is that pixel circuit configuration is become rectangular display device, and each image element circuit possesses:
Pixel TFT, one end are connected in accepts the data line that data-signal is supplied with, and grid is connected in selection wire, and is H level or L level by the selection signal sets with selection wire, and forms 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, in order to keep the voltage by the data-signal of data line supply; And
Liquid crystal module, one side's electrode are connected in the aforementioned other end of pixel TFT, and the opposing party's electrode remains on the public electrode current potential, and to two interelectrode liquid crystal applied voltages,
Aforementioned maintenance electric capacity line is when with aforementioned pixel TFT conducting, keeps being changed to second level by first 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,
Aforementioned maintenance electric capacity line is provided with two corresponding to going of each image element circuit, a plurality of image element circuits that are disposed at line direction are connected in two arbitrary of keeping the electric capacity line, and two keep the electric capacity line traffic control to be made as two kinds of current potentials simultaneously,
And establish: the capacitance of aforementioned maintenance electric capacity is Csc, capacitance in the stray capacitance that node produced of aforementioned maintenance electric capacity line that is connected in neighboring pixel circuits and aforementioned pixel electrode is Cpa, capacitance in the grid capacitance that node produced of the grid of aforementioned pixel TFT and aforementioned pixel electrode is Cgs, the capacitance of foregoing liquid crystal assembly is Clc, the magnitude of voltage that is shifted in aforementioned maintenance electric capacity line is Δ Vsc, the black level voltage of aforementioned data signal and the potential difference (PD) of white level voltage are Vcont, black level voltage after the voltage shift is VB, when supply makes the supply voltage of power supply of the electric power of image element circuit action be VDD, satisfy following (i), (ii) formula:
{(Csc-Cpa)/(Cgs+Clc+Csc+Cpa)}·Δ?Vsc＝VB-Vcont/2 (i)
ΔVsc＜VDD (ii)。
7. display device according to claim 6, wherein, in aforementioned two kinds of current potentials, when a side current potential by just toward negative direction, or by negative during toward positive direction displacement, the opposing party's current potential is shifted in the other direction toward it.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
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| JP2004152497 | 2004-05-21 | ||
| JP2004152485 | 2004-05-21 | ||
| JP2004152485 | 2004-05-21 | ||
| JP2004152493 | 2004-05-21 | ||
| JP2004152489 | 2004-05-21 |
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| CN2008100088356A Division CN101241286B (en) | 2004-05-21 | 2005-05-23 | Display device |
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| CN100437731C CN100437731C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100718268A Expired - Fee Related CN100472303C (en) | 2004-05-21 | 2005-05-20 | Display device |
| CNB200510072216XA Expired - Fee Related CN100437731C (en) | 2004-05-21 | 2005-05-23 | Display device |
| CN2008100088356A Expired - Fee Related CN101241286B (en) | 2004-05-21 | 2005-05-23 | Display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683367A (en) * | 2011-03-17 | 2012-09-19 | 佳能株式会社 | Semiconductor apparatus and method of manufacturing the same |
| CN103698927A (en) * | 2013-12-31 | 2014-04-02 | 敦泰科技有限公司 | Touch display device, drive circuit and drive method |
| US9953595B2 (en) | 2012-07-11 | 2018-04-24 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and method for driving the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
-
2005
- 2005-05-20 CN CNB2005100718268A patent/CN100472303C/en not_active Expired - Fee Related
- 2005-05-23 CN CNB200510072216XA patent/CN100437731C/en not_active Expired - Fee Related
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683367A (en) * | 2011-03-17 | 2012-09-19 | 佳能株式会社 | Semiconductor apparatus and method of manufacturing the same |
| US9953595B2 (en) | 2012-07-11 | 2018-04-24 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and method for driving the same |
| TWI630443B (en) * | 2012-07-11 | 2018-07-21 | 日商半導體能源研究所股份有限公司 | Liquid crystal display device and method for driving the same |
| CN103698927A (en) * | 2013-12-31 | 2014-04-02 | 敦泰科技有限公司 | Touch display device, drive circuit and drive method |
| CN103698927B (en) * | 2013-12-31 | 2017-05-10 | 敦泰电子有限公司 | touch display device, drive circuit and drive method |
| US10073562B2 (en) | 2013-12-31 | 2018-09-11 | Focaltech Electronics, Ltd. | Touch display apparatus, driving circuit, and driving method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1700078A (en) | 2005-11-23 |
| CN100437731C (en) | 2008-11-26 |
| CN101241286B (en) | 2010-06-09 |
| CN101241286A (en) | 2008-08-13 |
| CN100472303C (en) | 2009-03-25 |
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