CN101963728A - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- CN101963728A CN101963728A CN2009101616471A CN200910161647A CN101963728A CN 101963728 A CN101963728 A CN 101963728A CN 2009101616471 A CN2009101616471 A CN 2009101616471A CN 200910161647 A CN200910161647 A CN 200910161647A CN 101963728 A CN101963728 A CN 101963728A
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Abstract
The invention discloses a liquid crystal display. A pixel region is partitioned into two sub pixels; and each of the two sub pixels comprises a respective thin film transistor (TFT), a liquid crystal capacitor and storage capacitors, and the pixel is connected with the TFT of the other adjacent pixel in an inversion mode. When the liquid crystal display is driven, a high voltage is provided for a scanning line so as to open the TFT, and a data signal and a control signal are provided for a data line and a lead which is connected with each of the storage capacitors. When the high voltage of the scanning line is converted into the low voltage, the sub pixel and the adjacent sub pixel generate corresponding voltage variation values of the first sub pixel and the second sub pixel respectively; and one of the respective storage capacitance and the liquid crystal capacitance of the sub pixel and the adjacent sub pixel is adjusted, so that the data voltage is changed to different extents in two adjacent picture time intervals.
Description
Technical field
The present invention relates to LCD, and be particularly related to the high-resolution Thin Film Transistor-LCD of a kind of tool.
Background technology
Existing high resolution color display because power consumption is very low, is applicable to and uses various electronic equipments.And in order to obtain wide viewing angle (wide viewing angle), (Multi-domain Vertical Alignment MVA) can obtain the visual angles of 178 degree by many quadrants vertical orientation that Fujitsu developed.The contrast aspect is also than other wide viewing angle technology height.
And it is well known, many quadrants vertical orientation is a kind of technology of LCD optical compensation, mainly be that pixel segmentation is become four parts, and change many quadrants (Multi-Domain) method of the well azimuth of every field molecule, make view angle dependency produce homogenising and can solve the form and aspect variation issue that produces because of angle.But unfortunately, adopt the Multi-Domain method when stravismus, can produce colour cast (color washout) to the colour of skin (skin color) and blue (sky color).
From the above, Fig. 1 illustrates the gray scale voltage of the liquid crystal molecule that uses the MVA technology and the graph of a relation of transmissivity, and wherein transverse axis is represented the gray scale voltage of liquid crystal molecule, and unit is a volt (V), and the longitudinal axis is represented transmissivity (transmittance).When human eye was faced this LCD, the relation curve of its transmissivity and voltage was that when the gray scale voltage that is applied increased, its transmissivity changed thereupon with dotted line 101 expressions.Look side ways this LCD and work as human eye with an angle of inclination, the relation curve of its transmissivity and voltage is with dotted line 102 expressions, though applying voltage increases, its transmissivity also changes thereupon, but in zone 100, equivalent does not increase along with the increase that applies voltage as positive apparent time in the variation of its transmissivity, just can produce the inequality form and aspect and change, and this is the main cause that causes colour cast.
Therefore, a kind ofly solve the scarce plain of aforementioned colour cast and be suggested, mainly (also be eight quadrants (Domain), (4azimuthal * 2polar angle) these quadrants system is adjusted according to horizontal public electrode of part (common electrode) and the inferior pixel electrode (pixel electrode) that is vertical configuration with eight parts of pixel segmentation.Be stated as in more detail, shown in Fig. 2 A, this public electrode 201 comprises the first vertical component effect 201a, the second vertical component effect 201b and the first horizontal part 201c, and this time pixel electrode 202 comprises the first horizontal part 202a and vertical component effect 202b.And voltage is not when being applied to public electrode 201 and time pixel electrode 202, and Liquid Crystal Module 400 is original state.
Shown in Fig. 2 B, and when impressed voltage is applied to public electrode 201 and inferior pixel electrode 202, then the first electric field 300a and the second electric field 300b can be produced, thereby Liquid Crystal Module 400 has the situation generation that turns to along the first electric field 300a and the second electric field 300b.Along with the increase of voltage, this Liquid Crystal Module 400 can be towards the direction that axially is unanimity of this electric field that has produced.Yet, when the first electric field 300a produces the first horizontal part 202a with this time pixel electrode 202 and is 135 angles and the second electric field 300b and produces the first vertical component effect 202b with this time pixel electrode 202 and be miter angle and spend, correspondingly, this Liquid Crystal Module 400 also rearranges thereupon, this result, not because of higher voltage applies down, and cause transmissivity to reduce.
And existing Sharp (sharp) Application No. is 20050122441 employing 8-Domain technology, and as shown in Figure 3, this figure illustrates the equivalent electrical circuit of the pixel 50 (pixel) of LCD.Pixel 50 (R pixel or G pixel or B pixel) can be divided into twice pixel (sub pixel), this for the first time pixel 51 and for the second time pixel 52 comprise separately thin film transistor (TFT) 511 and thin film transistor (TFT) 512, itself and the inferior pixel electrode (pixel electrode) 513 and 514 of this thin film transistor (TFT) 511 respectively and 512 corresponding companies, the memory capacitance (storage capacitor) 515 and 516 that links to each other with this time pixel electrode 513 and 514 respectively, by this time pixel electrode 513 respectively and 514 with respectively this memory capacitance 515 and 516 liquid crystal capacitances 517 and 518 in parallel, and the counter electrode (counterelectrode) 519 and 520 that links to each other with this liquid crystal capacitance 517 and 518 respectively, also claim public electrode Vcom.By among the figure as can be known, this thin film transistor (TFT) 511 and each gate terminal of 512 also are referred to as grid bus 530 (gate busline) with a common scanning line (common scan line) and are connected, and determine to open or close state according to the common scanning signal, and each source terminal is connected with data line (data line) 531.Respectively this memory capacitance 515 and an end of 516 link to each other with this thin film transistor (TFT) 511 and 512 by corresponding time pixel electrode 513 and 514, reach the other end and then be connected with storage capacitance line (capacitor line) 532 and 533, and this memory capacitance counter electrode receives different memory capacitance subtend voltage by this storage capacitance line 532 and 533 by the memory capacitance counter electrode of this memory capacitance.
And the effect of the above-mentioned thin film transistor (TFT) of mentioning is to be used as a switch, scan each bar sweep trace in regular turn by gate drivers (Gate Driver) (not illustrating), it is from top to bottom opened in regular turn, open simultaneously at the thin film transistor (TFT) of a permutation, write data voltage by source electrode driver (Source Driver) (not illustrating) again.This memory capacitance 515 and 516 and this liquid crystal capacitance 517 and 518 parallel connections be to be used for increasing electric capacity, to keep data voltage.Wherein source electrode driver is for the demonstration particular importance of high-speed driving, high resolving power, low power consumption.Also must be attentively, the color that shows at display panel is to change the penetrance of back lighting through liquid crystal by adding data voltage, the light process chromatic filter layer of different brightness changes into R, G, the B signal synthesizes color.And be to avoid producing electrochemical reaction at the electrode surface of liquid crystal panel, the life-span of liquid crystal display cells is shortened, the driving voltage of LCD is done the polarity of voltage counter-rotating every some cycles so existing Sharp adopts the some reversal process.It below is implementation.
As shown in Figure 4, this figure is presented at the circuit description of the LCD employing point reversal process of Sharp, and wherein pixel is arranged with 8 row, 6 behaviors representatives, data line be with S-C1, S-C2, S-C3, S-C4 ..., S-Ccq is representative, sweep trace is with G-L1, G-L2, G-L3, G-Lrp is representative, and storage capacitance line is representative with CS-A and CS-B.And be noted that at Fig. 4, in proper order the voltage of pixel electrode be higher than the voltage of counter electrode be positive polarity (with+be representative), if the voltage that is lower than counter electrode then for negative polarity (with-be representative), and well known, adopt some reversal process meeting to make the polarity difference of adjacent point can reduce the generation of cross-talk (crosstalk) phenomenon.
Consult Fig. 5, it is the equivalent electrical circuit that a certain viewing area according to Sharp's LCD illustrates, wherein each pixel comprises twice pixel (with symbol A and B representative), and pixel comprises liquid crystal capacitance CLA_n separately, m and CLB_n each time, m, memory capacitance CCSA_n, m and CCSB_n, m, each liquid crystal capacitance is made up of inferior plain electrode and counter electrode ComLC, and each memory capacitance is made up of storage capacitor electrode, dielectric film and memory capacitance counter electrode ComCSA_n and ComCSB_n.Twice pixel thin film transistor (TFT) TFTA_n by separately, m and thin film transistor (TFT) TFTB_n, m and being connected with common data line (source busline) SBL_m.As thin film transistor (TFT) TFTA_n, it then is to receive scanning voltage signal by sweep trace (gate busline) GBL_n to decide that m and thin film transistor (TFT) TFTB_n, m open or close.Need be appreciated that in this pixel array circuit, memory capacitance counter electrode ComCSA_n is connected with memory capacitance line concentration CSVtypeR1, another memory capacitance counter electrode ComCSB_n then is connected with memory capacitance line concentration CSVtypeR2.
Consult Fig. 6 simultaneously, this figure is the waveform of the numbering that is used to drive liquid crystal panel (a)-(j) voltage signal that illustrates of the line of pixels column circuits that disposes according to Fig. 4.
When applying a voltage to S-C1, S-C3, S-C5 (odd number group SO) (voltage waveform (a)), apply a voltage to S-C2, S-C4, S-C6 (even number group SE) (voltage waveform (b), wherein voltage waveform (a) and voltage waveform (b) are the shows signal voltage waveform, be applied to the voltage waveform (waveform (c)) of storage capacitance line CS-A, be applied to the voltage waveform (voltage waveform (d)) of storage capacitance line CS-B, apply voltage at sweep trace G-L1～G-L6 (voltage waveform (e)～voltage waveform (j)).So when Gate Driver opened this thin film transistor switch of a permutation by G-L1～G-L6, Source Driver cooperated this row pixel data voltage of input in real time, and the display frame desired signal is provided.
And by among Fig. 6 as can be known, the cycle of the voltage of sweep trace from low-voltage (VgL) to (VgH) between the high voltage and from the voltage of next sweep trace from low-voltage to the cycle between the high voltage, its horizontal width is 1H.And the high voltage potential that maintains of sweep trace is referred to as the selection period (PS) sometimes.Secondly, because all pixels are GTG in the middle of showing, all shows signal voltage (voltage waveform (a) and voltage waveform (b)) has the concussion waveform of constant intensity, therefore, the concussion cycle of these voltage waveform signals is the horizontal width (2H) of twice, yet, if the LCD that also comprises aforementioned Sharp (sharp) at Thin Film Transistor-LCD be will reach large scale and high resolving power target the time, the quite key and important that just seems of the capacitor charging time on the pixel-driving circuit.Because if improve resolution, must increase the scanning linear number, and will finish many scanning linear action more at a fixed time, represent that the required time of each bar scanning linear shortens, on large-sized panel, it is bigger that relative memory capacitance also can become simultaneously.
Unfortunately, when the LCD of this Sharp (sharp) is the 120Hz mode of operation in the multiplication of picture velocity of rotation, because the factor of RC-Delay, (wherein the C value of RC-Delay also refers to the capacitance (capacitance) (the big capacitance of tool) for the storage capacitance line CS-A that is connected to memory capacitance and storage capacitance line CS-B, and also referring to the resistance value (resistance) of storage capacitance line CS-A and storage capacitance line CS-B, the R value of RC-Delay makes that capacitor charging time can't corresponding apace running and increased the duration of charging (τ), as shown in Figure 7, this figure illustrates the virtual voltage waveform of storage capacitance line CS-A and storage capacitance line CS-B, its RC-Delay time is about 5us, it should be noted that, on storage capacitance line CS-B voltage waveform, be that V1 is V2 through RC-Delay, make that the voltage of pixel is different with the edge of whole front panel in the centre of whole front panel from original voltage.And the image element circuit of this Sharp's LCD needs two electric capacity line concentrations, also can cause significant RC-Delay phenomenon.
From the above mentioned, if any providing a kind of high-resolution LCD to press for.
Summary of the invention
Therefore purpose of the present invention is providing a kind of high-resolution LCD exactly, in the R pixel, this three pixel all is divided into pixel two times in G pixel and the B pixel, when being different from existing Thin Film Transistor-LCD and will reaching large scale and high resolving power target, because the factor of RC-Delay, make that capacitor charging time can't corresponding apace running and increased the duration of charging, the present invention is by pixel region being divided into twice pixel, and comprise independently thin film transistor (TFT) in the pixel each time, liquid crystal capacitance and memory capacitance, and wherein at least one memory capacitance adopts variable capacitance, providing the driving high voltage to sweep trace, when in regular turn this transistor being opened, then, and respectively provide data-signal to data line and control signal to and lead that respectively this memory capacitance was connected.This sweep trace is when high voltage is converted to low-voltage, make this time pixel and adjacent inferior pixel produce corresponding first time of pixel and the voltage change of pixel for the second time respectively, and adjust the storage capacitance value separately of this time pixel and adjacent inferior pixel, one of them of liquid crystal capacitance value, make at adjacent two pictures in the period, data voltage produces change in voltage in various degree.
Another object of the present invention is exactly that a kind of image element circuit of LCD is being provided, two thin film transistor (TFT)s that one pixel is comprised are connected by a lead (CS) with the two thin film transistor (TFT)s inversion that another adjacent pixels is comprised, the memory capacitance of comparing at existing Sharp (sharp) liquid crystal circuit then needs two leads (CS), can simplify the program of technology, reduce cost, increase aperture opening ratio, improve yield.
Another object of the present invention just provides a kind of driving method of LCD, uses row inversion driving devices (signal driver) to make picture show and has a characteristic of counter-rotating (dot inversion).
According to above-mentioned purpose of the present invention, a kind of LCD is provided, this LCD comprises first and second sweep trace and first and second data line is intersected with each other, and define first pixel and second pixel, this first pixel comprises first switch and second switch, and this second pixel comprises the 3rd switch at least, wherein this first, second and the drain electrode of the 3rd switch be coupled to the electrode tip of first, second and the 3rd memory capacitance respectively; And lead, couple this first, second and another electrode tip of the 3rd memory capacitance, and the grid of this first and second switch is coupled to this first sweep trace, the grid of the 3rd switch is coupled to this second sweep trace, and the source electrode of this first and second switch is coupled to this first data line, and the source electrode of the 3rd switch is coupled to this second data line.
Description of drawings
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended graphic being described in detail as follows:
Fig. 1 illustrates the gray scale voltage of the liquid crystal molecule that uses the MVA technology and the graph of a relation of transmissivity;
The method that Fig. 2 A illustrates with 8-domains solves the scarce plain of colour cast, and wherein liquid crystal layer is in the OFF state;
The method that Fig. 2 B illustrates with 8-domains solves the scarce plain of colour cast, and wherein liquid crystal layer is in the ON state;
Fig. 3 has the image element circuit of Sharp (sharp) now;
Fig. 4 is presented at the circuit description of the LCD system employing point reversal process of Sharp;
Fig. 5 is the equivalent electrical circuit that a certain viewing area according to Sharp's LCD illustrates;
Fig. 6 is the waveform of the numbering that is used to drive liquid crystal panel (a)-(j) voltage signal that illustrates according to the line of pixels column circuits that is disposed;
Fig. 7 illustrates the waveform of actual CS-A and CS-B voltage signal;
Fig. 8 illustrates the equivalent electrical circuit schematic diagram of thin film transistor (TFT) of the present invention-LCD panel;
Fig. 9 illustrates the drive waveforms figure that drives pixel cell of the present invention;
Figure 10 illustrates the voltage waveform that memory capacitance is charged;
Figure 11 illustrates when using traditional row inversion driving device that LCD framework data line shown in Figure 8 is driven, the image data that its data line is sent;
Figure 12 illustrates the data that pixel region is stored according to the employed signal of video signal of Figure 11 to drive image element circuit of the present invention.
Embodiment
Present preferred embodiment below at length is discussed.Yet should be understood that, the invention provides many invention ideas applicatory, and these ideas can be embodied in very broad various specific concrete background.The specific specific embodiment of being discussed only is that ad hoc fashion of the present invention is used in explanation, and can not limit the scope of the invention.
First embodiment
Consult shown in Figure 8ly, this figure is the equivalent electrical circuit road diagram of LCD panel of the present invention.Need mention, the LCD chipset that LCD panel circuit of the present invention is adopted comprises to be responsible for the signal of video signal conversion and to handle, reception is from the control chip (Control IC) (not illustrating) and responsible signal of video signal output and demonstration of the signal of computing machine, output signal to chip for driving (Driver IC) two major types of LCD panel, wherein aforementioned chip for driving comprises source electrode driver (Source Driver) 80 and gate drivers (Gate Driver) 81, uses some chips to combine respectively according to the height of resolution.
Consult Fig. 8 once more, in figure as can be known, in the m bar data line (Dm) of n bar sweep trace (Gn) that is connected with this gate drivers 81 and source electrode driver 80 connections, the first sweep trace G1 and the second sweep trace G2 and the first data line D1 and the second data line D2 are intersected with each other, and define first pixel 801 and second pixel 802, wherein, arbitrary this pixel 801 and 802 all comprises pixel twice.And be stated as than detail circuits for twice pixel of aforementioned first pixel 801, for the first time pixel 803 and for the second time pixel 804 comprise first switch 8031 and the second switch 8032 of making switch with thin film transistor (TFT), this the 1 and the drain electrode of second switch 8032 be coupled to first memory capacitance 8041 and second memory capacitance 8042 (the storage capacitor respectively, Cs) electrode tip, this the 1 and the grid of second switch 8032 be coupled to this first sweep trace G1, the source electrode of this first switch 8031 and second switch 8032 is coupled to this first data line D1.This electrode tip of aforementioned the one 8041 and second memory capacitance of mentioning 8042 couples pixel electrode 8051 and pixel electrode 8052 for the first time for the second time, and this first switch 8031 couples first liquid crystal capacitance 8061 and second liquid crystal capacitance 8062 respectively with the drain electrode of second switch 8032.This first liquid crystal capacitance 8061 couples public electrode respectively with the electrode tip of this second liquid crystal capacitance 8062, and the voltage signal of these public electrodes is V
ComAnd between this drain electrode of first switch 8031 and second switch 8032 and this grid, have a zone of overlapping, so that between this drain electrode of first switch 8031 and second switch 8032 and this grid, constitute first stray capacitance 8071 and second stray capacitance 8072 (Cgd) respectively.Similarly, second pixel 802 adjacent with this first pixel 801 comprise twice pixel (being respectively pixel 810 and the 4th pixel 811 for the third time) this pixel 810 and the 4th pixel 811 comprise the 3rd switch 8101 and the 4th switch 8102 of making switch with thin film transistor (TFT) for the third time, and for electric voltage frequency is reduced by half, this second pixel 802 is joined to be inverted connected mode and this first pixel 801, and more detailed image element circuit is described as follows:
In these switches that second pixel 802 is comprised, the drain electrode of the 3rd switch 8101 and the 4th switch 8102 is coupled to an electrode tip the 3rd switch 8101 of the 3rd memory capacitance 8111 and the 4th memory capacitance 8112 respectively and the grid of the 4th switch 8102 couples this second sweep trace G2, the source electrode of the 3rd switch 8101 and the 4th switch 8102 couples the second data line D2, wherein this electrode tip of the 3rd memory capacitance 8111 and the 4th memory capacitance 8112 drain electrode of coupling pixel electrode 8121 for the third time and the 4th pixel electrode 8122, the three switch 8101 and the 4th switch 8102 couples the 3rd liquid crystal capacitance 8131 and the 4th liquid crystal capacitance 8132 respectively.The 3 8131 couples public electrode respectively with the electrode tip of the 4th liquid crystal capacitance 8132, and the voltage signal of this public electrode is V
ComAnd between this drain electrode of the 3rd switch 8101 and the 4th switch 8102 and this grid, have the zone of overlapping, so that constitute trixenie electric capacity 8141 and the 4th stray capacitance 8142 (Cgd) at this drain electrode and this grid of the 3rd switch 8101 and the 4th switch 8102.
By being had, these store electricity in each pixel used when enough voltage keeps next time frame update, be provided for receiving the lead 8200 of modulation voltage (also being a kind of control signal) between first pixel 801 and second pixel 802, this lead 8200 couples another electrode tip of this first memory capacitance 8041, second memory capacitance 8042, the 3rd memory capacitance 8111 and the 4th memory capacitance 8112.In the present embodiment, what pay special attention to is, at least one of them is a variable capacitance to this first memory capacitance 8041 in first pixel 801 with this second memory capacitance 8042, and this variable capacitance has along with the capacitance that is applied to change in voltage on time pixel electrode and the lead.
And identical with existing panel driving principle in this enforcement circuit, this gate driver drive high voltage is to n bar sweep trace, and the waveform of being sent, and in regular turn the thin film transistor (TFT) of each row is opened.This gate drivers is in the state of scanning thereupon, and source electrode driver was then exported the voltage (Gradation Voltage) with gray scale and given and m bar data line this moment.Briefly, in this enforcement liquid crystal display-driving process, this gate drivers 81 provides first sweep signal to the first sweep trace G1, so that first switch 8031 and second switch 8032 are opened, this switch respectively to the first time pixel electrode 8051 and for the second time pixel electrode 8052 do the action that discharges and recharges, have the grayscale voltage value and write behind this time pixel electrode, with the difference of the magnitude of voltage of public electrode, the then effectively control brightness that transmits light.This source electrode driver 80 provides first data-signal to this first pixel 801 by the first data line D1, makes this first memory capacitance 8041 have different capacitances with second memory capacitance 8042.
And after closing first switch 8031 and second switch 8032, this gate drivers 81 provides second sweep signal to the second sweep trace G2, so that the 3rd switch 8101 and the 4th switch 8102 are opened, this switch is done the action that discharges and recharges to pixel electrode 8121 for the third time and the 4th pixel electrode 8122 respectively and is write and have a grayscale voltage value behind this time pixel electrode, with the difference of the magnitude of voltage of public electrode, the then effectively control brightness that transmits light.This source electrode driver 80 provides second data-signal to this second pixel 802 by the second data line D2.
So far can learn, this gate drivers 81 provides this first sweep signal to the first sweep trace G1 earlier, to open first switch 8031 and second switch 8032, then provide this second sweep signal to the second sweep trace to open the 3rd switch 8101 and the 4th switch 8102 again, in other words, the opening time of the opening time of this first switch 8031 and second switch 8032 and the 3rd switch 8101 and the 4th switch 8102 differs from one another.Make these memory capacitance charge to reach predetermined magnitude of voltage by this lead 8200.
And during plate conversion face to face, in present embodiment, with the public voltage signal V of fixed voltage value
ComBe applied to the public electrode on each liquid crystal capacitance, cause the liquid crystal molecule characteristic to destroy to avoid liquid crystal molecule in the liquid crystal capacitance to be under the fixing voltage environment always.
Moreover, for not having influence on the size of storage voltage value on the memory capacitance,, also provide a kind of driving method of LCD at image element circuit of the present invention, in order to drive pixel, below be the explanation of this method to produce corresponding picture (frame).
Fig. 9 is according to one preferred embodiment of the present invention in order to drive the drive waveforms figure of pixel cell, consults Fig. 8 simultaneously.In first picture (N) that writes positive polarity data-signal (also being first data-signal), rise to high potential state VgH at period T1 sweep trace current potential, first switch 8031 and second switch 8032 are opened, positive polarity voltage data by the transmission of first data line, be assumed to be VP, can be respectively by charging via first switch 8031 and 8032 pairs first liquid crystal capacitances 8061 of second switch and second liquid crystal capacitance 8062 and first memory capacitance 8041 and second memory capacitance 8042.At period T1 at the end, the first sweep trace current potential is declined to become low-potential state VgL, and first switch 8031 and second switch 8032 are closed.This moment, the voltage at first liquid crystal capacitance 8061 and second liquid crystal capacitance, 8062 two ends was to be maintained by first memory capacitance 8041 and second memory capacitance 8042.But in first switch 8031 and 8032 pent moments of second switch, positive polarity voltage data VP, the Δ V value that can descend, stray capacitance, liquid crystal capacitance and memory capacitance between the size of this Δ V value and the gate-source of this switch all have relation.
According to the first embodiment of the present invention, first pixel 801 comprises pixel 803 and pixel 804 for the first time for the second time, therefore has two Δ V values, is respectively Δ VA and Δ VB, and makes the inferior pixel electrode 8051 and the different pressure value V of 8052 tools of this twice pixel respectively
A, nmAnd V
B, nm, wherein Δ VA is relevant with first memory capacitance 8041 with first stray capacitance 8071, first liquid crystal capacitance 8061 between source electrode with the grid of first switch 8031, wherein V
A, nmFeed through voltage swing as described below:
ΔV
A＝(V
Cshigh-V
Cslow)×C
8041/(C
8041+C
8061+C
8071)
Also be Δ V
A=Δ V
Cs* C
8041/ (C
8041+ C
8061+ C
8071)
And Δ VB is relevant with second memory capacitance 8042 with second stray capacitance 8072, second liquid crystal capacitance 8062 between source electrode with the grid of second switch 8032, wherein V
B, nmFeedthrough (feed through) voltage swing as described below:
ΔV
B＝(V
Cshigh-V
Cslow)×C
8042/(C
8042+C
8062+C
8072)
Also be Δ V
B=Δ V
Cs* C
8042/ (C
8042+ C
8062+ C
8072)
In second picture (N+1) that writes negative polarity data-signal (also being second data-signal), when the period, T2 began, the first sweep trace current potential rises to high potential state VgH, first switch 8031 and second switch 8032 are opened, reverse voltage data by the transmission of first data line, be assumed to be-VP, can be respectively charge via first switch 8031 and 8032 pairs first liquid crystal capacitances 8061 of second switch and second liquid crystal capacitance 8062 and first memory capacitance 8041 and second memory capacitance 8042.At period T2 at the end, the first sweep trace current potential is declined to become low-potential state VgL, and first switch 8031 and second switch 8032 are closed.This moment, the voltage at first liquid crystal capacitance 8061 and second liquid crystal capacitance, 8062 two ends was to be maintained by first memory capacitance 8041 and second memory capacitance 8042.But in the moment that first switch 8031 and second switch 8032 are cut off, reverse voltage data-VP, Δ V value can descend.The size of this Δ V value is relevant with the stray capacitance between source electrode, liquid crystal capacitance and memory capacitance with the grid of switch.
And for the difference in size of Δ VA and Δ VB numerical value, can be by adjusting the first memory capacitance C of pixel 803 for the first time
8041Or the first liquid crystal capacitance C
8061Or the first stray capacitance C
8071Reach the second memory capacitance C of pixel 804 for the second time
8042Or the second liquid crystal capacitance C
8062Or the second stray capacitance C
8072Arbitrary capacitance values wherein gets final product, and adjusts the size of its bucking voltage value, can make that each pixel all can be discharged into its desired voltage value on the liquid crystal panel.
With existing bigger difference, the opening time of this first switch and second switch and the opening time of the 3rd switch differ from one another, feasible this memory capacitance of charging by this lead is to reach predetermined magnitude of voltage, as shown in figure 10, the voltage waveform in the memory capacitance of this lead does not drop to Δ V with regard to not being subjected to the influence of RC-Delay
Cs, thereby make that the voltage in each pixel is little in edge's difference of the centre of whole front panel and whole front panel.
Moreover, equivalent electrical circuit according to the image element circuit of LCD of the present invention, each sweep trace is controlled these R, G, B pixel, mainly comprise two thin film transistor (TFT)s of being arranged with first direction (also referring to " making progress ") with arbitrary R, G, B pixel, and this arbitrary pixel another adjacent pixel comprise two thin film transistor (TFT)s arranged with second direction (also referring to " downwards ") and in regular turn alternatively up and down form the whole image demonstration.If the equivalent electrical circuit of thin film transistor (TFT) of the present invention-LCD panel of the data collocation Fig. 8 that transmits with row inversion driving device IC (also being signal driver).It is described as follows in more detail.
Figure 11 shows, when using column inverting method with the drive thin film transistors LCD, reaches the image pattern from each data line the sweep time of each sweep trace.By the data line D2 of even-numbered, D4, D6 and sweep trace G2, the data of defined those pixels of G3...G.m are delayed single sweep time of sweep trace in order because of using line buffer (line buffer).For instance, initial, when the second sweep trace was opened, this second data line D2 should write the image data G of the pixel of defined first display unit of D2
21Yet,, data line D2 writes the pixel image data G by this sweep trace G1 and defined first display unit of data line D2
11But data line D1 and data line D3 are still to the R of the pixel of sweep trace G2 and data line D1 and defined first display unit of D3
21And B
21Write.
In this way, data line D4 should write R
22, but write R by the pixel of sweep trace G1 and defined second display unit of data line D4
12Data line D5 writes the pixel G by sweep trace G2 and defined second display unit of data line D5
22, data line D6 should write the pixel B by sweep trace G2 and defined second display unit of data line D6
22But data line D6 writes the pixel B by sweep trace G2 and defined second display unit of data line D6
12By that analogy, follow-up ablation process is also sayed with above-mentioned institute, is not repeated them here.
If the equivalent electrical circuit of thin film transistor (TFT) of the present invention-LCD panel of the data collocation Fig. 8 that transmits with row inversion driving device IC (also being signal driver), the result then as Figure 12 show that LCD system is with an inversion mode demonstration.Moreover, when these data that changed input to image element circuit of the present invention, be formed on each sweep trace and data line (D1, D2, D3 ... Dn) thin film transistor (TFT) of those on the cross-point along more than the sweep trace that its grid connected-alternately be provided with down.Therefore, when using row inversion driving device to drive these thin film transistor (TFT)s, those data systems are stored to up and down alternately in those pixels of spread pattern.
In sum, this case provides a kind of image element circuit and driving method thereof, can be applicable to liquid crystal indicator or other display device, by adjusting the duration of charging length that bucking voltage value or adjustment apply bucking voltage, so that each pixel all can be by charge/discharge to its desired voltage value on the liquid crystal panel.Can solve high resolving power or large scale liquid crystal panel, when the high frequency state of operation, for example in the time of 120 hertz, the problem of charge/discharge deficiency, and on the solution liquid crystal panel,, and make the charge/discharge of each pixel can't all reach the problem of desired voltage because of RC delay (delay) situation is remarkable.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (31)
1. LCD comprises:
First and second sweep trace and first and second data line are intersected with each other, and define first pixel and second pixel, described first pixel comprises first switch and second switch, and described second pixel comprises the 3rd switch at least, and the drain electrode of wherein said first, second and the 3rd switch is coupled to the electrode tip of first, second and the 3rd memory capacitance respectively; And
Lead, couple another electrode tip of described first, second and described the 3rd memory capacitance, and the grid of described first and second switch is coupled to described first sweep trace, the grid of described the 3rd switch is coupled to described second sweep trace, and the source electrode of described first and second switch is coupled to described first data line, and the source electrode of described the 3rd switch is coupled to described second data line.
2. LCD as claimed in claim 1, wherein said lead couples control signal, reach described first data line and couple data-signal, and the switching frequency of described control signal and described data-signal is mutually the same.
3. LCD as claimed in claim 2, wherein said control signal are modulation voltage.
4. LCD as claimed in claim 1, wherein said lead are arranged between described first sweep trace and described second sweep trace.
5. LCD as claimed in claim 1, the capacitance of wherein said first memory capacitance and described second memory capacitance differs from one another.
6. LCD as claimed in claim 1, one of wherein described at least first memory capacitance and described second memory capacitance are variable capacitance.
7. LCD as claimed in claim 1, the drain electrode of wherein said first and second switch couple first liquid crystal capacitance and second liquid crystal capacitance respectively.
8. have at least the capacitance of the capacitance of an electric capacity and remaining electric capacity different in the LCD as claimed in claim 7, wherein said first memory capacitance, described second memory capacitance, described first liquid crystal capacitance and described second liquid crystal capacitance.
9. LCD as claimed in claim 1, the opening time of the opening time of wherein said first and second switches and described the 3rd switch differs from one another.
10. LCD as claimed in claim 1, the described electrode tip of wherein said first, second and the 3rd memory capacitance couple first, second and pixel electrode for the third time respectively.
11. LCD as claimed in claim 1, wherein said first and second switch is opened by described first sweep trace, and described first pixel is write first picture by described first data line, and described the 3rd switch is opened by described second sweep trace, and described second pixel is write second picture by described second data line, make that the polarity of described first and second picture is opposite each other.
12. LCD as claimed in claim 1, wherein said first and second switch is opened by described first sweep trace, and by the described first data line transmission of data signals to described first pixel, so that described first and second memory capacitance has different capacitances.
13. LCD as claimed in claim 1, the described electrode tip of wherein said first, second memory capacitance couples first and second time pixel electrode respectively, and, make that the voltage change of described first and second time pixel electrode is unequal by importing described data-signal to described first and second time pixel electrode.
14. LCD as claimed in claim 1, the described electrode tip of wherein said first, second memory capacitance couples first and second time pixel electrode respectively, and described first and second switch is opened by described first sweep trace, and by the described first data line transmission of data signals to described first pixel, make that the voltage change of described first and second time pixel electrode is unequal.
15. LCD as claimed in claim 7, the electrode tip of wherein said first liquid crystal capacitance and described second liquid crystal capacitance is coupled to public electrode, and described public electrode couples public voltage signal.
16. LCD as claimed in claim 15, wherein said public voltage signal are fixed voltage value.
17. the driving method of a LCD, described LCD comprises first pixel and lead, described first pixel comprises first switch and second switch, described first and second switch is coupled to the electrode tip of first and second memory capacitance respectively, and the electrode tip that is coupled to first and second liquid crystal capacitance respectively, another electrode tip of described first and second memory capacitance is coupled to described lead, and the grid of described first and second switch is coupled to first sweep trace, and the source electrode of described first and second switch is coupled to first data line, have at least the capacitance of an electric capacity different with the capacitance of remaining electric capacity in wherein said memory capacitance and the described liquid crystal capacitance, described method comprises:
Provide first sweep signal to described first sweep trace, to open described first and described second switch; And
First data-signal is provided respectively and controls signal to described first data line and described lead, the switching frequency of wherein said first data-signal and described control signal is mutually the same.
18. driving method as claimed in claim 17, wherein said first differs from one another with the capacitance of described second memory capacitance.
19. driving method as claimed in claim 17, the described electrode tip of wherein said first, second memory capacitance couples first and second time pixel electrode respectively, and described method also comprises: by with described first data signal transmission to described first and second time pixel electrode, make that the voltage change on described first and second time pixel electrode is unequal.
20. driving method as claimed in claim 17, wherein said LCD also comprises second pixel adjacent with described first pixel, described second pixel comprises the 3rd switch and the 3rd memory capacitance at least, the grid of described the 3rd switch and source electrode couple second sweep trace and second data line respectively, and the electrode tip of described the 3rd memory capacitance couples described lead, and described driving method also comprises:
After described first sweep signal is provided, provide second sweep signal to described second sweep trace, opening described the 3rd switch, and
Provide second data-signal to described second data line.
21. driving method as claimed in claim 20, the switching frequency of wherein said second data-signal and described control signal is mutually the same.
22. driving method as claimed in claim 20, the polarity of wherein said first data-signal and described second data-signal is opposite each other.
23. driving method as claimed in claim 17, wherein said control signal are modulation voltage.
24. driving method as claimed in claim 17, another electrode tip of first, second of wherein said LCD and the 3rd memory capacitance couples first, second and pixel electrode for the third time respectively, and described method also comprises by described first data line described first pixel is write first picture, and by described second data line described second pixel is write second picture, and the polarity of described first and second picture is opposite each other.
25. the driving method of a LCD, described LCD comprises first pixel and a lead, described first pixel comprises first switch and second switch, described first and second switch is coupled to the electrode tip of first and second memory capacitance respectively, and the electrode tip that is coupled to first and second liquid crystal capacitance respectively, another electrode tip of described first and second memory capacitance is coupled to described lead, and the grid of described first and second switch is coupled to first sweep trace, and the source electrode of described first and second switch is coupled to first data line, wherein described at least first with described second memory capacitance in one of be variable capacitance, described method comprises:
Provide first sweep signal to described first sweep trace, to open described first and described second switch; And
First data-signal is provided respectively and controls signal to described first data line and described lead, the switching frequency of wherein said first data-signal and described control signal is mutually the same.
26. driving method as claimed in claim 25 also comprises described first data-signal of transmission to described first pixel, makes described first and second memory capacitance have different capacitances.
27. driving method as claimed in claim 25, the described electrode tip of wherein said first, second memory capacitance couples first and second time pixel electrode respectively, and described method also comprises: by the transmission of described first data-signal, make that the voltage change on described first and second time pixel electrode is unequal.
28. driving method as claimed in claim 25, wherein said LCD also comprises second pixel adjacent with described first pixel, described second pixel comprises the 3rd switch and the 3rd memory capacitance at least, the grid of described the 3rd switch and source electrode couple second sweep trace and second data line respectively, and the electrode tip of described the 3rd memory capacitance couples described lead, and described driving method also comprises:
After described first sweep signal is provided, provide second sweep signal to described second sweep trace, opening described the 3rd switch, and
Provide second data-signal to described second data line.
29. driving method as claimed in claim 28, the switching frequency of wherein said second data-signal and described control signal is mutually the same.
30. driving method as claimed in claim 28, the polarity of wherein said first data-signal and described second data-signal is opposite each other.
31. driving method as claimed in claim 25, wherein said control signal are modulation voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101616471A CN101963728A (en) | 2009-07-24 | 2009-07-24 | Liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101616471A CN101963728A (en) | 2009-07-24 | 2009-07-24 | Liquid crystal display |
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| CN101963728A true CN101963728A (en) | 2011-02-02 |
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| CN2009101616471A Pending CN101963728A (en) | 2009-07-24 | 2009-07-24 | Liquid crystal display |
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| CN104795035A (en) * | 2015-04-24 | 2015-07-22 | 昆山龙腾光电有限公司 | Common voltage generation circuit, array substrate and liquid crystal display device |
| CN105405424A (en) * | 2015-12-16 | 2016-03-16 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, driving circuit, and display apparatus |
| CN106940505A (en) * | 2017-05-08 | 2017-07-11 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104795035A (en) * | 2015-04-24 | 2015-07-22 | 昆山龙腾光电有限公司 | Common voltage generation circuit, array substrate and liquid crystal display device |
| CN104795035B (en) * | 2015-04-24 | 2017-10-20 | 昆山龙腾光电有限公司 | Public voltage generating circuit, array base palte and liquid crystal display device |
| CN105405424A (en) * | 2015-12-16 | 2016-03-16 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, driving circuit, and display apparatus |
| US10049634B2 (en) | 2015-12-16 | 2018-08-14 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, driving circuit, display device |
| CN105405424B (en) * | 2015-12-16 | 2018-12-28 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, driving circuit, display device |
| CN106940505A (en) * | 2017-05-08 | 2017-07-11 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN109949762A (en) * | 2017-12-21 | 2019-06-28 | 咸阳彩虹光电科技有限公司 | A kind of picture element matrix driving method and display device |
| CN109949765A (en) * | 2017-12-21 | 2019-06-28 | 咸阳彩虹光电科技有限公司 | A kind of picture element matrix driving method and display device |
| CN109949762B (en) * | 2017-12-21 | 2022-06-14 | 咸阳彩虹光电科技有限公司 | Pixel matrix driving method and display device |
| CN109949765B (en) * | 2017-12-21 | 2022-09-16 | 咸阳彩虹光电科技有限公司 | Pixel matrix driving method and display device |
| CN109410838A (en) * | 2018-12-29 | 2019-03-01 | 云谷（固安）科技有限公司 | A kind of pixel circuit and display device |
| CN111916033A (en) * | 2020-08-19 | 2020-11-10 | 惠科股份有限公司 | Display device and driving method thereof |
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