CN1855210A - LCD and its drive circuit - Google Patents
LCD and its drive circuit Download PDFInfo
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- CN1855210A CN1855210A CN 200610073787 CN200610073787A CN1855210A CN 1855210 A CN1855210 A CN 1855210A CN 200610073787 CN200610073787 CN 200610073787 CN 200610073787 A CN200610073787 A CN 200610073787A CN 1855210 A CN1855210 A CN 1855210A
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Abstract
A liquid crystal display of this invention includes a plurality of scan lines, a plurality of data lines, and pixels provided at each intersection of the plurality of scan lines and the plurality of data lines. The liquid crystal display further includes a plurality of pixel groups constituted of the pixels provided at each intersection of the consecutive plurality of data lines and one of the plurality of scan lines, in which signals of the same polarity are outputted to all data lines included in each of the plurality of pixel groups by a time-sharing drive that sequentially outputs signals, and reversed polarity signals are outputted to the plurality of pixel groups adjacent to each other, so that signals with polarities inverted after each frame are outputted to the data lines included in the pixel groups.
Description
Technical field
The present invention relates to LCD and driving circuit thereof, it is suitable for only having in the panel one side setting of an inversion driving data line drive circuit of D/A change-over circuit.
Background technology
In well-known LCD, later by anti-phase by a plurality of voltages (after this being called pixel voltage) that TFT is added on the pixel at each predetermined period from data line.This means that pixel drives in the AC mode.The polarity here is meant the positive or negative polarity of the pixel voltage for the voltage (com voltage) of as a reference liquid crystal public electrode.A kind of like this driving method is used to prevent the degeneration of liquid crystal material.
This driving method, known have an inversion driving method and a 2H point inverting method.In an inversion driving method, the adjacent data line and the polarity of the pixel voltage on the sweep trace are by anti-phase, and therefore, adjacent pixels has the polarity that differs from one another.In 2H point inversion driving method, the polarity of the pixel voltage on the data line that each is adjacent and per two sweep traces is by anti-phase.These driving methods help to reduce flicker, thereby improve picture quality.
Japanese Patent Application No.8-129362 discloses a kind of circuit, and wherein the D/A change-over circuit drives many data lines with time-sharing format.In the disclosed driving circuit of this technology, the odd data line is connected to upper data line drive circuit, and the even data line is connected to the next data line drive circuit.In given horizontal cycle (being also referred to as the scan period), when negative polarity analog video signal during from the output of the next data line drive circuit, the positive polarity analog video signal is simultaneously from upper data line drive circuit output.Then in next horizontal cycle, when positive polarity analog video signal during from the next data line drive circuit output, the negative polarity analog video signal is simultaneously from upper data line drive circuit output.The point inversion driving method comes to this and realizes.Driving circuit further comprises initializing circuit, and it is used in the horizontal blanking cycle data line being initialized as com voltage, so that the time and the order that write with time-sharing format control.The grayscale voltage that provides from the data line drive circuit outside is anti-phase at each horizontal cycle.Therefore, constitute the switches set of selecting grayscale voltage with high voltage device.Japanese Patent Application No.2004-258485 has disclosed the configuration that a kind of RGB timesharing drives.
But we have found to exist some problems now in above-mentioned custom circuit.First problem is zone of requirement so that at the upside and the downside of plate data line drive circuit is set.This makes the size of plate become bigger.Thereby the panel number that obtains from a mother glass sheet reduces.And, be used for providing the flexible substrate distribution of signal and power supply to data line drive circuit, also need bigger region area.
Second problem is that circuit region enlarges, because be used for selecting the switches set of grayscale voltage to be made up of high voltage device.High power supply voltage requires usually with withstand voltage device forming circuit.Therefore, need thicker gate oxide film Tox and long gate length L, this also requires bigger circuit region.
Summary of the invention
According to an aspect of the present invention, provide a kind of LCD, it comprises: the multi-strip scanning line; Many data lines; The a plurality of pixels that on each intersection point of multi-strip scanning line and many data lines, are provided with; A plurality of pixel groups of forming by a plurality of pixels; With the driving circuit that drives multi-strip scanning line and many data lines, wherein, some pixels in a plurality of pixels that are provided with on the intersection point of a pixel groups by some data lines in many data lines and a sweep trace in a plurality of pixel groups are formed, and, driving circuit is with the timesharing type of drive, all data lines that comprise in each pixel groups in being included in a plurality of pixel groups are exported a kind of signal of polarity, the signal of adjacent towards each other a plurality of pixel groups output alternate polarity, inputing to the signal polarity that is included in the data line that comprises in a plurality of pixel groups is that each frame reverses once.
According to a further aspect in the invention, a kind of liquid crystal display drive circuit is provided, its data line output to LCD is the positive polarity analog video signal and the negative polarity analog video signal of opposed polarity with respect to reference voltage, wherein the positive polarity analog video signal is in the predetermined period of horizontal cycle, sequentially export more than first data line to time-sharing format, the negative polarity analog video signal sequentially exports more than second data line to time-sharing format in predetermined period.
According to another aspect of the invention, provide a kind of liquid crystal display drive circuit, it comprises: the positive polarity driving circuit, and it is formed on substrate first continuum, is used for the lead-out terminal output cathode analog video signal to display unit; The positive polarity pre-charge circuit, it is arranged between positive polarity driving circuit and the lead-out terminal, the polarity that is used at data line changes to from the positive polarity with respect to reference voltage before the negative polarity of band opposed polarity, and the data line of display unit is precharged near reference voltage; The negative polarity driving circuit, it is formed on second continuum that is different from first continuum on the substrate, is used for to lead-out terminal output negative pole analog video signal; With the negative polarity pre-charge circuit, it is arranged between negative polarity driving circuit and the lead-out terminal, is used for before the polarity of data line changes to positive polarity from negative polarity data line being precharged near reference voltage.
The present invention has reduced the size of the data line drive circuit in the LCD.
Description of drawings
Above-mentioned and other purposes, advantage and characteristic of the present invention from the explanation of doing below in conjunction with accompanying drawing, will be seen clearlyer.
Fig. 1 is the block scheme according to the LCD of first embodiment of the invention;
Fig. 2 is a detail drawing of selecting circuit 8 according to the timesharing of first embodiment of the invention;
Fig. 3 is according to the digital video signal of first embodiment of the invention and the associated diagram between the analog video signal;
Fig. 4 is the digital video signal on-off circuit detail drawing according to first embodiment of the invention;
Fig. 5 is data line drive circuit 10 block schemes according to first embodiment of the invention;
Fig. 6 is the detail drawing according to the positive D/A change-over circuit 31 of first embodiment of the invention;
Fig. 7 is the detail drawing according to the negative D/A change-over circuit 32 of first embodiment of the invention;
Fig. 8 is the synoptic diagram according to the pixel polarity of first embodiment of the invention;
Fig. 9 is the timing diagram according to first embodiment of the invention;
Figure 10 A to 10D is the detail drawing according to the precharge operation of first embodiment of the invention;
Figure 11 is the sectional view according to the SIC (semiconductor integrated circuit) of first embodiment of the invention;
Figure 12 is the detail drawing according to data line drive circuit 10 outputs of second embodiment of the invention;
Figure 13 is a detail drawing of selecting circuit 8 according to the timesharing of second embodiment of the invention;
Figure 14 is the timing diagram according to second embodiment of the invention;
Figure 15 is the block scheme according to the LCD of third embodiment of the invention;
Figure 16 is the detail drawing according to the electric charge recycling circuit 9 of third embodiment of the invention;
Figure 17 is the timing diagram according to the electric charge recovery of third embodiment of the invention.
Embodiment
Present invention is described below with reference to illustrated embodiment.Those familiar with the art person will recognize, utilize technology of the present invention can finish many alternative embodiment, and the invention is not restricted to the illustrated embodiment that these are used for illustration purpose.
First embodiment
Fig. 1 is the block scheme of the LCD 100 of present embodiment.The LCD 100 of present embodiment comprises multi-strip scanning line 4, many data lines 3 and be configured in multi-strip scanning line 4 and each intersection point of many data lines 3 on pixel 5.LCD 100 further comprises a plurality of pixel groups of being made up of pixel 5, and pixel is arranged on each intersection point of adjacent many data lines 3 and a sweep trace in the multi-strip scanning line 4.The timesharing driving method of utilization order output signal, the signal of identical polar exports all included in each pixel groups of a plurality of pixel groups data lines to, the signal of opposite polarity exports a plurality of pixel groups adjacent one another are to, and the signal of reversal of poles exports the data line that comprises in the pixel groups to.
In other words, as shown in fig. 1, form many data lines 3 and multi-strip scanning line 4 on the substrate 2 of LCD, multi-strip scanning line 4 is arranged orthogonally with many data lines 3.On each intersection point of data line 3 and sweep trace 4, form as the TFT (thin film transistor (TFT)) of switching device and comprise the pixel 5 of liquid crystal.In pixel 5, form show electrode and the public electrode of giving liquid crystal applied voltages.The analog video signal of control pixel luminous (the luminous amount of penetrating) offers show electrode from data line 3, and the com voltage of dc voltage offers public electrode from public electrode wire 7.On substrate 2, form the scan line drive circuit 6 of driven sweep line 4 in addition and select circuit 8 with the timesharing that the analog video signal that time-sharing format provides the data line 90 from data line drive circuit 10 is changed.
In addition, 1 of driver IC is configured in a side of substrate 2, which is provided with data line drive circuit 10, signal processing circuit 11 and power circuit 12 as driving circuit.Data line drive circuit 10 responding digital vision signals provide analog video signal to data line 3 and pixel 5.As noted earlier, 10 of data line drive circuits are configured in a side of substrate 2.Consideration is from the output voltage precision (this point back will be described) of the analog video signal of D/A change-over circuit output, preferably data line drive circuit 10 being integrated in Semiconductor substrate for example has on the quite high-precision silicon substrate, preferably also signal processing circuit 11 is integrated on the Semiconductor substrate that is easy to multilayer wiring, because signal processing circuit 11 utilizes macro block to lay automatically.
Fig. 2 is the detail drawing that circuit 8 is selected in timesharing, and this circuit is the part of the driving circuit of LCD of the present invention.Lead-out terminal Xn (data line 90) is connected three lines in the data line 3 by time-shared switch 81,82 with 83.Though this is exemplified as trisection and drives, isodisperse can be four or more.But be noted that if isodisperse is four when display unit is three kinds of colors each colored rgb signal of establishment can be by separated.In this case, constitute each colored rgb signal by different paths.Because path characteristics produces nuance, make the balance among the RGB produce the space, thereby cause colored shadow.In fact the colored display unit of establishment is three kinds of colors of RGB, and the number of pixels that constitutes a display unit is 3, so preferably by 3 multiple, 6 or 9 five equilibriums for example.
In the present embodiment, select circuit 8 to assign the pixel and the data line of analog video signals, be defined as pixel groups and data line group respectively from lead-out terminal Xn output of data line drive circuit 10 and by timesharing.In Fig. 2, three data lines that are used for R1, G1 and B1 are called a data line group D_Gn, and in addition, the data line group that every line of Y1, Y2 and Y3 is used is called pixel groups P_Gm.
As mentioned above, timesharing selects circuit 8 to be formed on the substrate 2, and is controlled by the signal processing circuit 11 of driver IC 1 inside.Timesharing selects the control circuit of circuit 8 can be formed on the substrate 2, preferably directly uses the signal processing circuit 11 of driver IC 1 inside, to be convenient to synchronous between control signal and the data line drive circuit 10.
Below power circuit 12 is described in detail.Power circuit 12 produces a voltage from the DC power vd C that driver IC 1 outside provides, provide it to data line drive circuit 10 and scan line drive circuit 6.Power circuit 12 is made up of DCDC converter, regulator etc., produce positive polarity high power supply voltage VPH, the negative polarity low supply voltage VNL of data line drive circuit 10 usefulness and positive polarity high power supply voltage VPH, the negative polarity low supply voltage VNL of scan line drive circuit 6 usefulness.After this positive polarity low supply voltage of data line drive circuit 10 usefulness and negative polarity high power supply voltage are called system " (GND) ", here, and VPH=5V, VNL=-5V, VGH=10V, VGL=-10V.
Because the output impedance characteristic of power supply, power circuit 12 has higher mobility than the TFT that is formed on the substrate 2.Therefore, preferably power circuit 12 is integrated on the silicon substrate that is easy to multilayer wiring.In the present embodiment, this circuit is integrated as driver IC 1 with above-mentioned data line drive circuit 10 and signal processing circuit 11.
Com voltage can be by the buffer generating with positive polarity high voltage VPH and negative polarity low-voltage VNL operation, and the voltage of output from 2V to-2V is as com voltage.Impact damper is formed by high voltage device.Though prevent the output of GND voltage with GND and negative voltage VNL operation buffer, if do not guarantee the voltage-regulation scope to GND, voltage devices formed during then impact damper can be used.
Com voltage can be produced by the circuit of easy configuration, wherein between GND and VNL resistor voltage divider circuit is set, and connects pass capacitor at the node of resistance.
Fig. 3 illustrates the relation between positive gamma curve (positive), negative gamma curve (negative) and the com voltage.Fine tuning com voltage in-1 ± 1V scope so that positive gamma curve is not less than GND and is not more than VPH, is not less than VNL and is not more than GND and bear gamma curve.Though fine tuning scope here is interpreted as for convenience's sake ± 1,, when com voltage with GND with when negative polarity low-voltage VNL voltage produces as mentioned above, com voltage also can carry out fine tuning in that scope.Regulate the amount of boost that com voltage can reduce the DCDC converter in the power circuit 12 near GND, improve the efficient of power circuit 12, reduce power consumption at last.
Below signal processing circuit 11 is described in detail.The signal that exports signal processing circuit 11 to comprises digital video signal Dx, clock signal clk, vertical synchronizing signal Vsync and horizontal-drive signal Hsync at least, select each circuit in circuit 8, the scan line drive circuit 6 etc. for control data line drive circuit 10, timesharing, produce desirable timing signal for example commencing signal STH, latch signal STB, polar signal POL, time-shared switch control signal and vertical commencing signal STV with these signals.Because the circuit on the substrate 2 is with the supply voltage work of VGH and VGL,, provide VGH that level moves and the signal of VGL so supply with the signal of substrate 2.
10 whiles of data line drive circuit of the present invention are to each lead-out terminal Xn output cathode analog video signal and negative polarity analog video signal of data line drive circuit 10.
Here positive and negative polarity is represented the positive or negative pixel voltage for liquid crystal public electrode voltages (com voltage) as a reference.But in the present embodiment, positive and negative polarity represents that reference voltage is the positive and negative polarity of system " (GND) " pixel voltage (0V).
Fig. 5 is the block scheme of data line drive circuit 10, describes each configuration of components below in detail.Data line drive circuit 10 is to positive polarity analog video signal and the negative polarity analog video signal of the data line of LCD 10 output with respect to the opposed polarity of reference voltage.In the period demand of horizontal cycle, data line drive circuit 10 with time-sharing format to more than first data line continuously the output cathode analog video signal time, with time-sharing format to more than second data line output negative pole analog video signal continuously.
Therefore, data line drive circuit 10 comprises at least that data latches circuit 17, positive polarity level shift circuit 21, negative polarity level shift circuit 22, positive polarity D/A change-over circuit 31, negative polarity D/A change-over circuit 32, positive polarity grayscale voltage produce that circuit 41, negative polarity grayscale voltage produce circuit 42 and as the pre-charge circuit 60 of output control part.Data line drive circuit 10 can further comprise digital video signal time-sharing circuit 50, shift-register circuit 15, data register circuit 16 and frame memory (not shown).
Data register circuit 16 comprises positive polarity data register circuit 16a and negative polarity data register circuit 16b.Positive polarity data register circuit 16a links to each other with the data bus of digital video signal Dx, and these data buss are DRo, DGo and DBo.Positive polarity data register circuit 16a response is latched from data bus DRo, DGo and the next digital video signal of DBo from the sampled signal SPn of shift-register circuit 15 inputs.Negative polarity data register circuit 16b links to each other with the data bus of digital video signal Dx, and these data buss are DRe, DGe and DBe.Negative polarity data register circuit 16b response is latched from data bus DRe, DGe and the next digital video signal of DBe from the sampled signal SPn of shift-register circuit 15 inputs.
Data register circuit 16 is connected to data latches circuit 17.Data latches circuit 17 comprises positive polarity data latches circuit 17a and negative polarity data latches circuit 17b, and it is the digital video signal Dx that latched of latch data register circuit 16 once more.Data latches circuit 17 is connected to digital video signal time-sharing circuit 50.Digital video signal time-sharing circuit 50 comprises time-shared switch 51,52 and 53, closes 51,52 and 53 when switching on and off separately, in chronological order the digital video signal Dx that is one after the other latched in the output data latch circuit 17.The time-sharing operation that digital video signal time-sharing circuit 50 is carried out is by the control signal control from signal processing circuit 11 inputs.
It is resistor voltage divider circuits that a plurality of resistance are connected in series that grayscale voltage produces circuit 41 and 42, produces desirable voltage so that the coupling gamma characteristic.In the present invention, dispose the positive polarity grayscale voltage and produce circuit 41 and negative polarity grayscale voltage generation circuit 42, it is used for exporting the negative polarity and the positive polarity analog video signal of the reverse voltage (VN0 to VN63) of the positive polarity voltage (VP0 to VP63) that has 64 grades of calibration respectively and 64 grades of calibration instantaneously, and can export a plurality of grayscale voltages that each RGB color is carried out fine tuning with time-sharing format.Have two grayscale voltages that are used for positive and negative polarity to produce circuit 41 and 42, each corrected value with the RGB color is stored to the fine tuning register, and produces the grayscale voltage of the positive and negative of fine tuning.
Positive polarity D/A change-over circuit 31 responding digital vision signal Dx, output is with respect to the positive polarity analog video signal of reference voltage.Negative polarity D/A change-over circuit 32 responding digital vision signal Dx, output is with respect to the negative polarity analog video signal of reference voltage.Voltage devices forms in positive polarity D/A change-over circuit 31 and negative polarity D/A change-over circuit 32 usefulness, and the back will be described.
Fig. 6 is the detail drawing of positive polarity D/A change-over circuit 31.Positive polarity D/A change-over circuit 31 by amplifier 33, comprise that the selector switch 35 of 64 switches and code translator 37 form, the operating voltage range of each circuit is from GND to VPL (5V).Positive polarity grayscale voltage (VP0 to VP63) offers each switch of selector switch 35 from positive polarity grayscale voltage generator 41.From 64 grades of positive polarity grayscale voltages, depend on digital video signal Dx by code translator 37 and select a grayscale voltage, then selected grayscale voltage is exported through amplifier 33.
Fig. 7 is the detail drawing of negative polarity D/A change-over circuit 32.Negative polarity D/A change-over circuit 32 by amplifier 34, comprise that the selector switch 36 of 64 switches and code translator 38 form, the operating voltage range of each circuit is that VNL is (5V) to GND.Negative polarity grayscale voltage (VN0 to VN63) produces each switch that circuit 42 offers selector switch 36 from the negative polarity grayscale voltage.Based on digital video signal Dx, from 64 grades of negative polarity grayscale voltages, select a grayscale voltage by code translator 38, then selected grayscale voltage is exported through amplifier 34.
The logical gate of signal processing circuit 11 and data latches circuit 17 etc. operate in GND to VDD (2.5V).Therefore, positive polarity level shift circuit 21 and negative polarity level shift circuit 22 are provided between data latches circuit 17 or digital video signal time-sharing circuit 50 and positive polarity D/A change-over circuit 31 and the negative polarity D/A change-over circuit 32.Positive polarity level shift circuit 21 and negative polarity level move voltage devices and high voltage device formation in voltage 22 employings, and the back will be described.
As mentioned above, timesharing selects circuit 8 by a plurality of switches, and the lead-out terminal Xn of data line drive circuit 10 is linked to each other with many data lines 3.In detail as shown in Figure 2, time-shared switch 81,82 and 83 is provided between lead-out terminal X1 and data line R1, G1 and the B1.In other words, time-shared switch 81,82 and 83 is provided between lead-out terminal Xn and data line Rn, Gn and the Bn.Timesharing selects circuit 8 to work under VGH identical with scan line drive circuit 6 and VGL supply voltage.
In order to drive the pixel of color monitor QVGA (240RGB * 320) with trisection, each 120 positive polarity D/A change-over circuits 31 and negative polarity D/A change-over circuit 32 are provided for driver IC 1.In six five equilibriums drive, need each 60 positive polarity D/A change-over circuits and negative polarity D/A change-over circuit.But, in each electric charge recovery electric capacity 67 and 68 only need be set in LCD.Therefore, by positive and negative driving circuit carries out time-sharing operation to each with time-sharing format, and, can simplify the configuration of circuit by making the reversal of poles of driven each data line group.
Below operation is described in detail.When horizontal commencing signal STH inputed to shift-register circuit 15, the sampled signal SPn synchronous with internal clock signal CK in turn produced.Response sampled signal SPn, digital video signal Dx is latching to data register circuit 16.Be latched in the input of the digital video signal Dx response latch signal STB in the data register circuit 16, be latching to concurrently in the data latches circuit 17.Data latches circuit 17 is connected to positive polarity level shift circuit 21 or negative polarity level shift circuit 22.Digital video signal Dx is by positive polarity level shift circuit 21 and negative polarity level shift circuit 22 input positive polarity D/A change-over circuit 31 or negative polarity D/A change-over circuits 32.After that, digital video signal Dx is converted into positive polarity analog video signal or negative polarity analog video signal in positive polarity D/A change-over circuit 31 or negative polarity D/A change-over circuit 32.Then, the positive or negative polarity analog video signal selects the polarity switching 70 of positive or negative polarity analog video signal and timesharing to select circuit 8 through being used to according to polar signal POL, offers each data line 3.
Further operation is described in more detail below.For more clearly explanation, the situation of 6 data lines (R1, G1, B1, R2, G2 and B2) and two sweep traces (Y1, Y2) will be considered to have, as shown in Figure 8.Use (DR1, DG1, DB1, DR2, DG2 and DB2) to represent respectively with every data line (R1, G1, B1, R2, G2 and B2) corresponding digital video signal.Further, an example will be described, wherein the rgb pixel inversion driving of being carried out make the polarity of each element on the first sweep trace Y1 become (+,+,+,-,-,-), the polarity of each element on second sweep trace become (,-,-,+,+,+).As shown in Figure 8, each pixel is driven so that is inverted in the later pixel of every frame.
Digital video signal is switched to and pixel matching to display in the signal processing circuit 11 of Fig. 4 explanation.When polar signal POL was L, digital video signal (DR1, DG1 and DB1) offered data bus (DRo, DGo and DBo), was latching to positive polarity data register circuit 16a then.Digital video signal (DR2, DG2 and DB2) offers data bus (DRe, DGe and DBe), is latching to negative polarity data register circuit 16b then.On the other hand, when polar signal POL was H, digital video signal (DR1, DG1 and DB1) provided to data bus (DRe, DGe and DBe), was latching to negative polarity data register circuit 16b then.Digital video signal (DR2, DG2 and DB2) provides to data bus (DRo, DGo and DBo), is latching to positive polarity data register circuit 16a then.
Fig. 9 uses the timing diagram of operating each parts from the control signal of signal processing circuit 11 outputs.According to timing diagram 9 and electric charge reclaimer operation synoptic diagram 10A to 10D, during the first precharge cycle T1 of first horizontal cycle, electric charge reclaims switch 61,62, polarity reversing switch 72, time-shared switch 81,82 and 83 connection (on) (shown in Figure 10 A).Then, the positive polarity electric charge that is driven to the data line (R2, G2 and B2) of positive polarity at last horizontal cycle reclaims electric capacity 67 chargings to electric charge, similarly, the negative polarity electric charge that is driven to the data line (R1, G1 and B1) of negative polarity reclaims electric capacity 68 chargings to electric charge.
Further operation is elaborated below.After adding to data line from the voltage as picture signal of positive polarity D/A change-over circuit 31 and negative polarity D/A change-over circuit 32 by lead-out terminal Xn, between the electric charge of positive polarity D/A change-over circuit 31 and negative polarity D/A change-over circuit 32 is retained in TFT the pixel 5, until precharge switch 63 and 64 closures.But, after applying the voltage of picture element signal to data line 3 by lead-out terminal Xn, polarity reversing switch 71 and 72 is kept intact, closed time-shared switch 81,82 and 83, and being further closed electric charge recovery switch 61 and 62, the electric charge that is retained in the data line 3 just can be collected into electric charge recovery electric capacity 67 and 68.
Then, during the second precharge cycle T2 of first horizontal cycle, precharge switch 63,64, polarity reversing switch 72, time-shared switch 81,82 and 83 are connected (shown in Figure 10 B).The data line 3 that is driven to positive polarity at last horizontal cycle is precharged to reference voltage (GND), and similarly, the data line 3 that is driven to negative polarity is precharged to reference voltage (GND), so that their neutralizations.At this moment, electric charge reclaim switch 61 and 62 they be in open-circuit condition, electric charge is retained in electric charge and reclaims in the electric capacity 67 and 68.
Then, during the 3rd precharge cycle T3 of first horizontal cycle, electric charge reclaims switch 61,62, polarity reversing switch 71, time-shared switch 81,82 and 83 connections (shown in Figure 10 C).So the positive polarity electric charge reclaims electric capacity 67 from electric charge and is released into the data line 3 (R1, G1 and B1) that is precharged to reference voltage among the second precharge cycle T2, similarly, the negative polarity electric charge reclaims electric capacity 68 from electric charge and is released into data line 3 (R2, G2 and B2).In other words, by polarity reversing switch 71 and 72 is switched, discharge electric charge during the first precharge cycle T1 and reclaim the collected and electric charge that keeps in the electric capacity 67 and 68, electric charge will be released into other data line 3 of the data line that is not to collect electric charge.This operation can realize that electric charge reclaims, and the required power consumption of voltage that adds to data line 3 as picture element signal for reaching the voltage that applied by positive polarity D/A change-over circuit 31 and negative polarity D/A change-over circuit 32 is reduced.
Then, during the drive cycle of first horizontal cycle, connect switch 65,66 and polarity reversing switch 71 (shown in Figure 10 D) by connecting, analog video signal exports data line 3 to.In other words, during the first drive cycle T4 of first horizontal cycle, connecting switch 65,66, polarity reversing switch 71 and time-shared switch 81 connects, the positive polarity analog video signal exports data line R1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line R2 to from lead-out terminal X2.Then, during the second drive cycle T5 of first horizontal cycle, connecting switch 65,66, polarity reversing switch 71 and time-shared switch 82 connects, the positive polarity analog video signal exports data line G1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line G2 to from lead-out terminal X2.Then, during the 3rd drive cycle T6 of first horizontal cycle, connecting switch 65,66, polarity reversing switch 71 and time-shared switch 83 connects, the positive polarity analog video signal exports data line B1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line B2 to from lead-out terminal X2.
After, during the first precharge cycle T11 of second horizontal cycle, electric charge reclaims switch 61,62, polarity reversing switch 71, time-shared switch 81,82 and 83 connections.So in first horizontal cycle, be urged to the positive polarity electric charge of the data line 3 (R1, G1 and B1) of positive polarity electric charge is reclaimed electric capacity 67 chargings, similarly, the negative polarity electric charge that is urged to the data line 3 (R2, G2 and B2) of negative polarity in first horizontal cycle reclaims electric capacity 68 chargings to electric charge.Then, during the second precharge cycle T12 of second horizontal cycle, precharge switch 63,64, polarity reversing switch 71, time-shared switch 81,82 and 83 are connected.Be precharged to reference voltage (GND) so be urged to the data line 3 (R1, G1 and B1) of positive polarity in horizontal cycle, similarly, the data line 3 (R2, G2 and B2) that is urged to negative polarity is precharged to reference voltage (GND), so that their neutralizations.Then, during the 3rd precharge cycle T13 of second horizontal cycle, electric charge reclaims switch 61,62, polarity reversing switch 72, time-shared switch 81,82 and 83 connections.Discharge to the data line 3 (R2, G2 and B2) that is precharged to reference voltage at the second precharge cycle T12 so the positive polarity electric charge reclaims electric capacity 67 from electric charge, similarly, the negative polarity electric charge reclaims electric capacity 68 from electric charge and discharges to data line 3 (R1, G1 and B1).
Then, during the first drive cycle T14 of second horizontal cycle, connecting switch 65,66, polarity reversing switch 72 and time-shared switch 81 connects, the negative polarity analog video signal exports data line R1 to from lead-out terminal X1, and the positive polarity analog video signal exports data line R2 to from lead-out terminal X2.Then, during the second drive cycle T15 of second horizontal cycle, connecting switch 65,66, polarity reversing switch 72 and time-shared switch 82 connects, the negative polarity analog video signal exports data line G1 to from lead-out terminal X1, and the positive polarity analog video signal exports data line G2 to from lead-out terminal X2.Then, during the 3rd drive cycle T16 of second horizontal cycle, connecting switch 65,66, polarity reversing switch 72 and time-shared switch 83 connects, the negative polarity analog video signal exports data line B1 to from lead-out terminal X1, and the positive polarity analog video signal exports data line B2 to from lead-out terminal X2.
According to aforesaid operations, positive polarity D/A change-over circuit 31, electric charge reclaim switch 61, precharge switch 63 and are connected switch 65 and only be applied with positive polarity voltage, and negative polarity D/A change-over circuit 32, electric charge recovery switch 62, precharge switch 64 and be connected switch 66 and only be applied with reverse voltage.So voltage devices (5V) formed during these devices can be used, and will describe later on.Voltage devices in the employing uses thin gate oxide film and short grid length can reduce circuit area.
For preventing to produce flicker, the fluctuating that suppresses com voltage is an effective method.As in the present embodiment, even pixel is adjacent unlike R1 pixel and R2 pixel, equate in write-once that if be written into the total charge dosage of the positive and negative polarity analog video signal of pixel electric charge then positive and that bear is cancelled out each other, com voltage has only very trickle fluctuating.
By a series of precharge operation, the positive and negative polarity charge that is accumulate to data line can be assembled recovery, can produce 50% electric charge organic efficiency at most, also reduces power consumption simultaneously.
An example to the driving element IC1 that makes present embodiment is described in detail below.In the present embodiment, an example is by DIFFUSION TREATMENT, and manufacturing is with the low-voltage device of low-voltage (2.5V) work, with the middle voltage devices of middle voltage (5V) work and the high voltage device of working with high voltage (20V).Above-mentioned voltage only is an example, can be other voltages as long as keep low-voltage＜middle voltage＜high-tension relation.But the medium voltate device is used for voltage range positive polarity and that be used for negative polarity, and high voltage device can be used for this two kinds of ranges of charge.
Usually, for the device of transistor one class in the picture SIC (semiconductor integrated circuit), when having higher voltage, it is big that the area of device just becomes as you know.Relation in the middle of gate length Lmin, grid width Wmin, gate oxide film thickness T ox is: Lmin (voltage devices)＜Lmin (middle voltage devices)＜Lmin (high voltage device), Wmin (voltage devices)＜Wmin (middle voltage devices)＜Wmin (high voltage device), and Tox (voltage devices)＜Tox (middle voltage devices)＜Tox (high voltage device).Therefore, adopt the circuit arrangement of the least possible high voltage device can reduce the chip size of driver IC 1.
In the present embodiment, the logical block of signal processing circuit 11 and data latches circuit 17 etc. is to form with voltage devices, voltage devices forms in positive polarity D/A change-over circuit 31, negative polarity D/A change-over circuit 32 and pre-charge circuit 60 usefulness, and the part of polarity switching 70, negative polarity level shift circuit 22 and the part of signal processing circuit 11 form with high voltage device.Because control signal is input to scan line drive circuit 6 by level shift circuit and circuit 8 is selected in timesharing, high voltage device is as the part of signal processing circuit 11.
Figure 11 is the configuration sectional view of device on the substrate of SIC (semiconductor integrated circuit) and the substrate.Be called Q1n and Q1p with high voltage (20V) respectively as n transistor npn npn and p transistor npn npn with reference to formation, transistor and P transistor npn npn on the N trap-2 that forms as reference with middle voltage (5V) are called Q2n and Q2p respectively, be called Q3n and Q3p respectively and be called Q4n and Q4p respectively at n transistor npn npn on the N trap-3 and P transistor npn npn with n transistor npn npn and P transistor npn npn on the N trap-4 of low-voltage (2.5V) formation.
The voltage of substrate (Psub) usefulness is at least VGL=-10, signalization treatment circuit 11 on N trap-4, positive polarity D/A change-over circuit 31 is set on N trap-3, negative polarity D/A change-over circuit 32 is set on N trap-2, the part of polarity switching 70, negative polarity level shift circuit 22 and the part of signal processing circuit 11 then are set on Psub and N trap-1.Although the device except that transistor for example resistance, electric capacity and diode also is provided in the driver IC 1, the resistance to pressure of device is guaranteed.
Data line drive circuit 10 comprises a plurality of D/A change-over circuits that are used to drive many data lines, and each circuit is set to the continuum of each N trap according to operating voltage.Having between the N trap of different potentials needs tens μ m, so when such circuit is placed continuous N trap, can reduce to have the size of the circuit of identical voltage range.
In the present invention, polarity switching 70 usefulness high voltage devices (20V) form.Therefore, the operating voltage of polarity switching 70 can be between VGL=-10V and VPH=5V, VGL=-10V and VPH=10V, and the voltage of N trap-1 is defined as VPH=5V or VGH=10V.
Though substrate is assumed to P-type semiconductor in the present embodiment, substrate also can be a n N-type semiconductor N (Nsub).In this case, the voltage of Nsub will be VGH=10V at the most.
Second embodiment
In first embodiment, polarity switching 70 forms on driver IC 1, and timesharing selects circuit 8 to form on panel.And the selection circuit with polar switching function and timesharing translation function can form on this panel.Figure 12 is the detail drawing according to the D/A change-over circuit part and the pre-charge circuit part of the driver IC 1 of present embodiment.
In first embodiment, polarity switching 70 is provided between pre-charge circuit 60 and the lead-out terminal Xn.But in the present embodiment, pre-charge circuit 60 directly links to each other with lead-out terminal Xn.As shown in figure 13, timesharing selects circuit 8 to be made up of two switches of each data line 3.Each switch links to each other with an even number lead-out terminal with an odd number lead-out terminal, comprises the polar switching function.Therefore, forming timesharing on panel 2 selects the number of switches of circuit 8 double in first embodiment.For example, lead-out terminal X1 links to each other with three data lines (R1, G1 and B1) with 83 by switch 81,82, and links to each other with three data lines (R2, G2 and B2) with 86 by switch 84,85.The lead-out terminal X2 adjacent with lead-out terminal X1 links to each other with three data lines (R2, G2 and B2) with 83 by switch 81,82, and links to each other with three data lines (R1, G1 and B1) with 86 by switch 84,85.
In first embodiment, the positive or negative polarity analog video signal is from the lead-out terminal Xn output of driver IC 1.But in the present embodiment, the positive polarity analog video signal is from the output of odd number lead-out terminal, and the negative polarity analog video signal is exported from the even number lead-out terminal.Much less, circuit can be with such method configuration, from odd number lead-out terminal output negative pole analog video signal, from even number lead-out terminal output cathode analog video signal.
In the present embodiment, high voltage device for example power circuit 12 is formed on the panel 2, and data line drive circuit 10 and signal processing circuit 11 are formed on the driver IC 1.In first embodiment, the analog video signal that comes from positive or negative polarity D/A change-over circuit exports every data line to by three switches, and these three switches are to connect switch 65 or 66, polarity reversing switch 71 or 72 and be included in timesharing and select switch in the circuit 8.On the other hand, in the present embodiment, export analog video signal to each data line 3 by connecting switch 65 or 66 with the switch that is included in the timesharing selection circuit 8, the connection resistance of switch can reduce, thereby shortens driving time.
The high voltage device that is included in drive IC 1 only forms a part of negative level walking circuit, so the size of driver IC 1 chip can diminish.
To be similar to the mode of first embodiment, voltage devices formed during the switch of formation pre-charge circuit 60 was used.On Semiconductor substrate, make the switch of pre-charge circuit 60, make transistorized performance than on panel 2, glass substrate etc., making switch and exceed an order of magnitude, so shortened precharge time.Relatively cause long driving time short precharge time, therefore, can improve the number of five equilibrium and the number of minimizing A/D change-over circuit.
The operation of second embodiment is described below with reference to timing diagram shown in Figure 14.During the first precharge cycle T21 of first horizontal cycle, electric charge reclaims switch 61,62, time-shared switch 84,85 and 86 is connected.So be urged to the positive polarity electric charge of the data line (R2, G2 and B2) of positive polarity at last horizontal cycle electric charge is reclaimed electric capacity 67 chargings, similarly, the negative polarity electric charge that is urged to the data line (R1, G1 and B1) of negative polarity reclaims electric capacity 68 chargings to electric charge.Then, during the second precharge cycle T22 of first horizontal cycle, precharge switch 63,64, time-shared switch 84,85 and 86 are connected.After that, be precharged to reference voltage (GND) at last horizontal cycle drive to the data line (R2, G2 and B2) of positive polarity, similarly, the data line (R1, G1 and B1) that is urged to negative polarity is precharged to reference voltage (GND), so that their neutralizations.
Then, during the period 3 of first horizontal cycle T23, electric charge reclaims switch 61,62, time-shared switch 81,82 and 83 is connected.So the positive polarity electric charge reclaims electric capacity 67 to data line 3 (R1, G1 and the B1) discharge that is charged to reference voltage at the second precharge cycle T22 from electric charge, similarly, the negative polarity electric charge reclaims electric capacity 68 from electric charge and is released into data line 3 (R2, G2 and B2).Add to the electric charge of each data line 3 as picture element signal, come to this and realize collecting and discharge.
Then, during the first drive cycle T24 of first level, connect switch 65,66 and time-shared switch 81 connections, the positive polarity analog video signal exports data line R1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line R2 to from lead-out terminal X2.Then, during the second drive cycle T25 of first horizontal cycle, connect switch 65,66 and time-shared switch 82 connections, the positive polarity analog video signal exports data line G1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line G2 to from lead-out terminal X2.Then, during the 3rd drive cycle T26 of first horizontal cycle, connect switch 65,66 and time-shared switch 83 connections, the positive polarity analog video signal exports data line B1 to from lead-out terminal X1, and the negative polarity analog video signal exports data line B2 to from lead-out terminal X2.
After that, during the first precharge cycle T31 of second level, electric charge reclaims switch 61,62, time-shared switch 81,82 and 83 is connected.So be driven to the positive polarity electric charge of the data line 3 of positive polarity at first horizontal cycle electric charge is reclaimed electric capacity 67 chargings, similarly, the negative polarity electric charge that is urged to negative polarity at first horizontal cycle reclaims electric capacity 68 chargings to electric charge.Then, during the second precharge cycle T32 of second horizontal cycle, precharge switch 63,64, time-shared switch 81,82 and 83 are connected.After that, the data line (R1, G1 and B1) that is urged to positive polarity at last horizontal cycle is precharged to reference voltage (GND), and similarly, the data line (R2, G2 and B2) that is urged to negative polarity is precharged to reference voltage (GND), so that their neutralizations.Then, during the period 3 of second horizontal cycle T33, electric charge reclaims switch 61,62, polarity reversing switch 71, time-shared switch 84,85 and 86 connections.After that, the positive polarity electric charge reclaims electric capacity 67 from electric charge and is released into the data line 3 (R2, G2 and B2) that is precharged to reference voltage at the second precharge cycle T22, similarly, the negative polarity electric charge reclaims electric capacity 68 from electric charge and is released into data line 3 (R1, G1 and B1).
Then, during the first drive cycle T34 of second horizontal cycle, connect switch 65,66 and time-shared switch 84 connections, the positive polarity analog video signal exports data line R2 to from lead-out terminal X1, and the negative polarity analog video signal exports data line R1 to from lead-out terminal X2.Then, during the second drive cycle T35 of second horizontal cycle, connect switch 65,66 and time-shared switch 85 connections, the positive polarity analog video signal exports data line G2 to from lead-out terminal X1, and the negative polarity analog video signal exports data line G1 to from lead-out terminal X2.Then, during the 3rd drive cycle T36 of second horizontal cycle, connect switch 65,66 and time-shared switch 86 connections, the positive polarity analog video signal exports data line B2 to from lead-out terminal X1, and the negative polarity analog video signal exports data line B1 to from lead-out terminal X2.As shown in Figure 8, drive each pixel, cause pixel inversion after every frame.
In first and second embodiment, for convenience of description, the write sequence of pixel is R → G → B.But, be preferably in and write G for example R → B → G or B → R → G at last, because form time-shared switch 81,82 and at 83 o'clock, consider the leakage current of TFT with TFT, G's (green) is highly sensitive in R (red) and B (indigo plant).Also having, though the number of five equilibrium is illustrated as 3, must not be 3.But in this case, the number of five equilibrium is 3 multiple preferably, because RGB is three kinds of colors.For example, if be divided into 6, then preferably the pixel of same color is for example write in the D/A change-over circuit with the order of R1 → R2 → B1 → B2 → G1 → G2 together.Write perhaps by the order of R1 → B1 → G1 → R2 → B2 → G2 and can cause the demonstration shade, because when B1 that between R1 and R2, writes and G1, because the leakage current of the time-shared switch that forms with TFT makes the voltage of pixel R1 rise and fall to some extent.
Although along with more five equilibrium can reduce the number of D/A change-over circuit, the demonstration shade of panel is also found out easily.In order to address this problem, preferably in frame, change the write sequence of same colored pixels, with four frames as a unit.An example application of write sequence for example is: first and second frames are for (R1 → R2 → B1 → B2 → G1 → G2), third and fourth frame are (R2 → R1 → B2 → B1 → G2 → G1).
The 3rd embodiment
In a second embodiment, the selection circuit with polar switching function and timesharing translation function is formed on the panel.Electric charge recycling circuit can be formed on the panel.
Figure 15 is the block scheme of LCD 200 of the present invention.Electric charge recycling circuit 9 further forms on liquid crystal panel substrate 2.Electric charge recycling circuit 9 is subjected to the signal controlling of signal processing circuit 11 outputs.Below with reference to Figure 16 electric charge recycling circuit 9 is described in detail.In electric charge recycling circuit 9, two electric charges reclaim switch 91 and 92 and offer data line 3 concurrently, and the other end that electric charge reclaims switch 91 and 92 is connected to the other bus bar 95 or 96 of each data line group.Bus bar 95 and 96 is connected to electric charge respectively and reclaims electric capacity 93 and 94.During first precharge cycle of horizontal cycle, electric charge reclaims switch 91 and 92 and controlled by polar signal POL.Electric charge recycling circuit 9 is also selected to utilize VGH and the operation of VHL supply voltage the circuit 8 as scan line drive circuit 6 and timesharing.
Below with reference to timing Figure 17 the electric charge reclaimer operation is described in detail.At first horizontal cycle, polar signal POL is H.During the first precharge cycle T41 of first horizontal cycle, switch 81,82 and 83 disconnects, and switch 92 is connected, and makes the electric charge that is accumulated in the data line 3 move to electric charge and reclaims electric capacity 93, to collect electric charge.Then, during the second precharge cycle T42 of first horizontal cycle, switch 92 disconnects, and switch 81,82 and 83 is connected, and precharge switch 63,64 is connected, so be precharged to reference voltage.Then, during the 3rd precharge cycle T43 of first horizontal cycle, precharge switch 63,64 disconnects, and switch 81,82 and 83 disconnects, and switch 91 is connected, and moves to data line 3 so make electric charge reclaim electric capacity 94 from electric charge, to reclaim electric charge.
In second horizontal cycle, polar signal POL becomes L.During the first precharge cycle T51 of second horizontal cycle, switch 81,82 and 83 disconnects, and switch 91 is connected, and makes the electric charge that is accumulated in the data line 3 move to electric charge and reclaims electric capacity 94, to collect electric charge.Then, during the second precharge cycle T52 of second horizontal cycle, switch 91 disconnects, and switch 81,82 and 83 is connected, and connects in the precharge switch 63,64 of driver IC 1 inside, so be precharged to reference voltage.Then, during the 3rd precharge cycle T53 of second horizontal cycle, precharge switch 63,64 disconnects, and switch 81,82 and 83 disconnects, and switch 92 is connected, and moves to data line 3 so make electric charge reclaim electric capacity 93 from electric charge, to reclaim electric charge.The operation of drive cycle (T44 to T46 and T54 to T56) is identical with first embodiment.
Identical with first and second embodiment, present embodiment can have such configuration, and the driving circuit that contains the D/A change-over circuit only is configured in a side of panel, thereby can reduce the size of data line drive circuit.Only can add to positive polarity D/A change-over circuit 31, also have only reverse voltage can add to negative polarity D/A change-over circuit 32 simultaneously in polar voltages.Therefore, level voltage (5V) formed during these devices can be used, and compared with utilizing high voltage device, and thin gate oxide film can be arranged, and short gate length can have less circuit area at last.
In the present embodiment, provide electric charge recycling circuit 9, can be reduced to the noise of driver IC 1 inner GND, and can prevent the power circuit of noise diffusion, therefore can obtain stable com voltage and satisfied demonstration to driver IC 1 inside in driver IC 1 outside.
Though in first, second and the 3rd embodiment the supposition reference voltage be system " ", reference voltage be not be necessary for system " ".The wrong feed of TFT (thin film transistor (TFT)) can be the voltage that shifts.More particularly, if the wrong feed of TFT be-1V, reference voltage is the virtual GND of driver IC 1, so com voltage will be system " ", the reference voltage of driver IC 1 will be 1V.In other words, can stipulate: positive polarity high power supply voltage VPH=6V, positive polarity low supply voltage (virtual GND)=1V, positive polarity high power supply voltage (virtual GND)=1V, negative polarity low supply voltage VNL=-4V.
Clearly, the invention is not restricted to the foregoing description, under the situation of the scope and spirit that do not break away from claim of the present invention, can make modifications and variations.
Claims (30)
1. LCD is characterized in that comprising:
The multi-strip scanning line;
Many data lines;
Be arranged on a plurality of pixels on each intersection points of multi-strip scanning line and many data lines;
A plurality of pixel groups of forming by a plurality of pixels; With
Drive the driving circuit of multi-strip scanning line and many data lines;
Wherein, pixel groups is made up of some pixels in the described a plurality of pixels on the intersection point that is arranged on some data lines in described many data lines and a sweep trace in a plurality of pixel groups, and
Driving circuit is with the timesharing type of drive, all data lines that comprise in each pixel groups in a plurality of pixel groups are exported a kind of signal of polarity, the signal of adjacent towards each other a plurality of pixel groups output alternate polarity, the polarity that inputs to the signal that is included in the data line in a plurality of pixel groups is that each frame reverses once.
2. LCD according to claim 1 is characterized in that further comprising:
The charge storage part, it carried out charge charging to data line before the reversing of data line.
3. LCD according to claim 1 is characterized in that: each data line that comprises in pixel groups is connected to signal wire selectively, and described signal wire offers time signal the data line that comprises in pixel groups.
4. LCD according to claim 1 is characterized in that: the number of the data line that comprises in each pixel groups of a plurality of pixel groups is the integral multiple that constitutes the number of pixels of display unit.
5. the driving circuit of a LCD is characterized in that comprising:
The data latches circuit, it latchs digital video signal;
Level shift circuit, its digital video signal that data latch circuit is latched carries out level and moves;
The D/A change-over circuit, it will carry out the digital video signal that level moves by level shift circuit and be converted to analog video signal; With
Output control part, it has the positive analog video signal and the negative analog vision signal of opposed polarity based on the output of D/A converter to the data line output and the reference voltage of LCD;
Wherein, output control part sequentially exports positive analog video signal to more than first data line with time-sharing format in the cycle of the regulation of horizontal cycle, sequentially the negative polarity analog video signal is exported to more than second data line with time-sharing format in the cycle of described regulation.
6. the driving circuit of LCD according to claim 5 is characterized in that: output control part was precharged near described reference voltage data line before the reversing of data line.
7. the driving circuit of LCD according to claim 5, it is characterized in that: output control part was precharged to described reference voltage to data line before the data line reversing.
8. the driving circuit of LCD according to claim 5 is characterized in that D/A converter comprises:
The positive polarity D/A converter, it is operated in the first voltage range of reference voltage and the first voltage defined that is higher than reference voltage, and output is with respect to the positive polarity analog video signal of reference voltage; With
The negative polarity D/A converter, it is operated in reference voltage and is lower than in second voltage range of the second voltage defined of reference voltage, and output with respect to the negative polarity analog video signal of reference voltage and
Output control part comprises:
Circuit is selected in timesharing, it is arranged between positive polarity D/A converter and the data line, and between negative polarity D/A converter and the data line, be operated in the tertiary voltage scope of voltage that is higher than first voltage and the voltage defined that is lower than second voltage, selectively the lead-out terminal of positive polarity D/A converter is linked to each other with a data line in more than first data line, and selectively the lead-out terminal of negative polarity D/A converter is linked to each other with a data line in more than second data line; With
Pre-charge circuit, it is arranged on positive and negative polarity D/A converter and timesharing is selected between the circuit, before the reversing of data line, data line is precharged near described reference voltage.
9. the driving circuit of LCD according to claim 6, it is characterized in that: output control part is before the reversing of data line, and the control data line is precharged to reference voltage.
10. the driving circuit of LCD according to claim 8 is characterized in that further comprising: polarity switching, it is operated in the tertiary voltage scope, and selects positive polarity analog video signal or negative polarity analog video signal based on polar voltages.
11. the driving circuit of LCD according to claim 10 is characterized in that: pre-charge circuit comprises a plurality of switches, first and second electric capacity,
Wherein, pre-charge circuit is controlled a plurality of switches, circuit or polarity selecting circuit are selected in timesharing, be used for period 1 at precharge cycle, first electric capacity is linked to each other with more than first data line, simultaneously second electric capacity is linked to each other with more than second data line, in the second round of precharge cycle, more than first data line and more than second data line are precharged near described reference voltage, with in the period 3 of precharge cycle, first electric capacity is linked to each other with more than second data line, simultaneously second electric capacity is linked to each other with more than first data line.
12. the driving circuit of LCD according to claim 8, it is characterized in that further comprising: positive and negative polarity gray scale voltage generation circuit, it links to each other with positive and negative polarity D/A converter, and can adjust for each color that constitutes colour cell.
13. the driving circuit of LCD according to claim 8 is characterized in that: timesharing select circuit to be formed on the panel substrate that is provided with data line and
Positive polarity D/A converter, negative polarity D/A converter and pre-charge circuit are formed on the Semiconductor substrate that is different from the panel substrate.
14. the driving circuit of LCD according to claim 8 is characterized in that: timesharing select circuit and pre-charge circuit to be formed on the panel substrate that is provided with data line and
Positive polarity D/A converter and negative polarity D/A converter are formed on the Semiconductor substrate that is different from the panel substrate.
15. the driving circuit of LCD according to claim 8, it is characterized in that further comprising: power circuit, its be used to produce voltage adjusting range for be lower than system " " and be higher than the dc voltage of the low-voltage of negative polarity D/A converter, perhaps be higher than system " " and be lower than the high-tension dc voltage of positive polarity D/A converter, and dc voltage is offered the public electrode of LCD.
16. the driving circuit of a LCD is characterized in that comprising:
The positive polarity driving circuit, its first continuum on substrate forms, and is used for the positive polarity analog video signal is exported to the lead-out terminal of display unit;
The positive polarity pre-charge circuit, it is arranged between positive polarity driving circuit and the lead-out terminal, the polarity that is used at data line changes to from the positive polarity with respect to reference voltage before the negative polarity of opposed polarity, and the data line of display unit is precharged near reference voltage;
The negative polarity driving circuit, its second continuum that is different from first continuum on substrate forms, and is used for exporting the negative polarity analog video signal to lead-out terminal; With
The negative polarity pre-charge circuit, it is arranged between negative polarity driving circuit and the lead-out terminal, is used for before the polarity of data line changes to positive polarity from negative polarity data line being precharged near reference voltage.
17. the driving circuit of LCD according to claim 16 is characterized in that further comprising: polarity switching, it is selected between positive polarity analog video signal and negative polarity analog video signal based on polar signal.
18. the driving circuit of LCD according to claim 17 is characterized in that:
Positive polarity driving circuit and positive pre-charge circuit are formed on first continuum, work in satisfying first voltage＞first voltage of reference voltage relation and the voltage range of reference voltage defined.
Negative polarity driving circuit and negative pre-charge circuit are formed on second continuum, in the voltage range of second voltage that satisfies reference voltage＞second voltage relationship and reference voltage defined work and
Polarity switching is formed on the 3rd continuum, works in the voltage range of a voltage that is higher than first voltage and a voltage defined that is lower than second voltage.
19. the driving circuit of LCD according to claim 18 is characterized in that: first continuum, second continuum and the 3rd continuum respectively have the MOS transistor that is formed at wherein and
The gate oxide film thickness of the MOS transistor of gate oxide thin film thickness in the 3rd continuum of the MOS transistor in first continuum and second continuum.
20. the driving circuit of LCD according to claim 18 is characterized in that: first continuum, second continuum and the 3rd continuum respectively have the MOS transistor that is formed at wherein and
The gate length of the MOS transistor in first continuum and second continuum is shorter than the gate length of the MOS transistor in the 3rd continuum.
21. the driving circuit of LCD according to claim 16, it is characterized in that also comprising: power circuit, its be used to produce voltage adjusting range be lower than system " " and be higher than the dc voltage of the low-voltage of negative polarity driving circuit, perhaps be higher than system " " and be lower than the high-tension dc voltage of positive polarity driving circuit, and dc voltage is offered the public electrode of LCD.
22. the driving circuit of a LCD is characterized in that comprising:
The positive polarity driving circuit, first continuum that it is formed on substrate is used for exporting the positive polarity analog video signal to export to display unit data line lead-out terminal;
The negative polarity driving circuit, it is formed on second continuum that is different from first continuum on the substrate, is used for being different from the negative polarity analog video signal of positive polarity with respect to reference voltage polarity, exports the lead-out terminal to data line output to;
The positive polarity pre-charge circuit, it links to each other with data line, is used for before the polarity of data line changes to negative polarity from positive polarity data line being precharged near reference voltage; With
The negative polarity pre-charge circuit, it links to each other with data line, is used for before the polarity of data line changes to positive polarity from negative polarity data line being precharged near reference voltage.
23. the driving circuit of LCD according to claim 22 is characterized in that further comprising: polarity switching, it is selected between positive polarity analog video signal and negative polarity analog video signal based on polar signal.
24. the driving circuit of a LCD is characterized in that comprising:
Data line drive circuit, it comprises the D/A converter that digital signal is converted to analog video signal; With
Power circuit, it is used to provide the power supply of data line drive circuit,
Wherein, data line drive circuit will have the positive polarity analog video signal of opposed polarity and the data line that the negative polarity analog video signal exports LCD to respect to reference voltage, it forms on Semiconductor substrate, and has an output control part, this output control part is with than the voltage range of positive and negative polarity analog video signal wide range of voltages more, and the circuit that forms on the substrate that is being different from described Semiconductor substrate provides control signal.
25. the driving circuit of LCD according to claim 24, it is characterized in that: being different from the described circuit that forms on the described substrate of described Semiconductor substrate is that circuit is selected in timesharing, and it is used for time-sharing format selecting from the continuous analog vision signal of the identical polar of described data line drive circuit output and exporting it to data line.
26. the driving circuit of LCD according to claim 24, it is characterized in that: being different from the described circuit that forms on the described substrate of described Semiconductor substrate is electric charge recycling circuit, it was used for before the reversing of data line, with the accumulation of data line to the charge storage part.
27. the driving circuit of a LCD, it is used for a horizontal cycle is divided into m five equilibrium at least, and will have the positive and negative polarity analog video signal of opposed polarity to export the data line of display unit to respect to reference voltage, comprising:
The positive polarity impact damper, it is used for the output cathode vision signal;
Data line, its quantity are 2 * m bar;
First switch, it is arranged between positive polarity impact damper and the data line;
The negative polarity impact damper, it is used for the output negative pole vision signal;
Second switch, it is arranged on the negative polarity impact damper and quantity is between the data line of 2 * m.
28. the driving circuit of LCD according to claim 27 is characterized in that: it is that the control signal of 2m is controlled that first and second switches are subjected to quantity.
29. the driving circuit of LCD according to claim 28 is characterized in that: positive and negative polarity impact damper forms on first substrate, and first and second switches form being different from second substrate of first substrate.
30. the driving circuit of LCD according to claim 27 is characterized in that:
The positive polarity impact damper is operated in the first voltage range of reference voltage and the first voltage defined that is higher than reference voltage,
The negative polarity impact damper be operated in reference voltage and be lower than in second voltage range of the second voltage defined of reference voltage and
First and second switches are operated in the tertiary voltage scope of voltage that is higher than first voltage and the voltage defined that is lower than second voltage.
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|---|---|---|---|
| JP2005119818 | 2005-04-18 | ||
| JP2005119818 | 2005-04-18 | ||
| JP2005346689 | 2005-11-30 |
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| CN1855210A true CN1855210A (en) | 2006-11-01 |
| CN100511399C CN100511399C (en) | 2009-07-08 |
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| CNB200610073787XA Expired - Fee Related CN100511399C (en) | 2005-04-18 | 2006-04-17 | LCD and drive circuit thereof |
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| CN101408700B (en) * | 2007-10-08 | 2011-07-13 | 中华映管股份有限公司 | Plane display |
| CN101740582B (en) * | 2008-11-26 | 2011-07-27 | 财团法人工业技术研究院 | Transistor array lower plate |
| WO2013143119A1 (en) * | 2012-03-28 | 2013-10-03 | 深圳市华星光电技术有限公司 | Liquid crystal display device, driving circuit, and driving method for same |
| CN106157906A (en) * | 2015-05-15 | 2016-11-23 | 瑞鼎科技股份有限公司 | Source electrode driver and How It Works thereof |
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| CN106526998A (en) * | 2016-12-13 | 2017-03-22 | 厦门天马微电子有限公司 | Array substrate, liquid crystal display panel and display device |
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