CN1162828C - Liquid crystal display device - Google Patents
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- CN1162828C CN1162828C CNB001224603A CN00122460A CN1162828C CN 1162828 C CN1162828 C CN 1162828C CN B001224603 A CNB001224603 A CN B001224603A CN 00122460 A CN00122460 A CN 00122460A CN 1162828 C CN1162828 C CN 1162828C
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Abstract
In an LCD device ,a distortion compensation signal generating section obtains change values DRQ1/DRQ2 of voltages V2a/V4a based on display data D and outputs compensation values T1/T2 indicating pulse widths to compensate for induced distortion. And that a power supply circuit outputs a compensation voltage V2s to a signal side driving circuit in response to the instruction from an integrated compensation signal generating section during a first period indicated by a signal dullness compensation pulse signal S0 and the period having a length indicated by the value T1 and outputs a compensation voltage V4s during the first period and the period having a length indicated by the value T2. Thus although the circuit outputs only the voltages V2s/V4s as compensation voltages, the fluctuation of effective values caused by induced distortion and signal dullness is compensated for by the difference between the both applied periods.Therefor to make suppressible a display irregularity caused by both of them.
Description
Technical field
The present invention relates to the liquid crystal indicator of a kind of employing by the simple nematic crystal display screen of voltage method of average driving.
Background technology
In recent years along with the popularizing of personal computer, word processor, generally adopt in light weight and slim, also can battery-driven liquid crystal indicator as its display device, come the CRT that substituted volume is big, consumed power is big (cathode-ray tube (CRT)).
The simple nematic of one of this liquid crystal display apparatus driving circuit drives, and drive with active nematic and compare, because each pixel that nematic is arranged does not need nonlinear element, thereby relatively easy the manufacturing, can reduce manufacturing cost.
The liquid crystal indicator 100 that above-mentioned existing simple nematic drives, for example as shown in figure 13, a plurality of scan electrode Y1～YM and a plurality of signal electrode X1～XN with mutual cross-over configuration, when scanning selection voltage V1 that a side drive circuit 103 supplies with power circuit 105 or V5 and be added on the scan electrode Y that selects successively, the non-selection voltage V3 of power circuit 105 outputs is added to non-selected each scan electrode Y ... on.And signal one side drive circuit 102 is added to signal voltage V2 or V4 on each signal electrode X1～XN according to video data.Thus, in LCDs 101 liquid crystal between scan electrode Yj and the signal electrode Xi part (liquid crystal capacitance, pixel PIX (i, j)) add and two electrode Xi, the corresponding voltage of Yj potential difference (PD) that this part transmitance changes with the effective voltage that is added on the liquid crystal capacitance.Thereby, can be by the voltage that is added on each signal electrode X1～XN and the scan electrode Y1～YM be controlled, (N, show state M) show the image based on video data to control LCDs 1 interior all pixel PIX (1,1)～PIX.
But above-mentioned liquid crystal indicator 100 along with the increase of the capacity of display and display area, just has its drive characteristic to cause, depend on the generations such as cross (talk) of display pattern, therefore exists tendency inhomogeneous, that display quality descends takes place to show.
Specifically, one of inhomogeneous as the demonstration that relies on display pattern, having by signal electrode is the brightness irregularities of unit performance, and this brightness irregularities is divided from its reason, and following 2 kinds of situations are arranged.
First kind of demonstration inhomogeneous (brightness irregularities), because of the distortion of sweep signal waveform influence occurs, scan electrode one side that is changed to of signal voltage is responded to, have in the sweep signal waveform to rely on the differentiated waveform of its capacitive component of liquid crystal, occur above-mentioned inhomogeneous when promptly induced distortion takes place with the time constant of signal wire and its resistance components of scan electrode.
Second kind of demonstration inhomogeneous (brightness irregularities) discharges and recharges liquid crystal capacitance and to cause, when signal voltage changes, relies on above-mentioned time constant and to the result that liquid crystal capacitance discharges and recharges is the signal voltage waveform generation passivation that adds itself.
More specify, then as shown in Figure 5, when being mixed with vertical elongate pieces pattern in the image to display, signal electrode Xa all instructs white demonstration (bright) to scan electrode Yd～Yd+9, and signal electrode Xb all instructs black show (secretly) to scan electrode Yd～Yd+9.But as shown in figure 14, for the driven liquid crystal, in the time that scan electrode Yd+1 is scanned, the upset of the logic of alternating signal FR.So signal electrode Xa is changed to voltage V2 from voltage V4, signal electrode Xb is changed to voltage V4 from voltage V2.This moment, non-selected scan electrode Yc, that add on the scan electrode Yc is non-selection voltage V3.And, signal electrode X one side the add voltage upset relative with scan electrode Yc, thereby the induced distortion that has this variation in voltage to cause among the scan electrode Yc takes place.
Here, suppose when wanting displayed map 5 patterns that for example, the signal electrode number that is changed to voltage V2 from voltage V4 as signal electrode Xa is 9N/10, it is then individual for N/10 to be changed to the signal electrode number of voltage V4 from voltage V2 as signal electrode Xb.So scan electrode Yc is in more multi-direction (change direction of the more side voltage of signal electrode number that is changed), promptly voltage V3 is changed on the direction of voltage V2 has induced distortion to take place.In Figure 14 example, every 3 row, alternating signal FR upset, thereby same in the time that scan electrode Yd+4, Yd+7 are scanned, is changed on the direction of voltage V4, the direction that voltage V3 is changed to voltage V2 at voltage V3 respectively induced distortion takes place.
Therefore, added voltage waveform of pixel A (Xa-Yc) and the added voltage waveform of pixel B (Xb-Yc) are as shown in figure 14.Specifically, do not have induced distortion, although pixel A, the last added driving voltage of B are identical effective value, in fact because above-mentioned induced distortion, the driving voltage effective value of pixel A can reduce, and the driving voltage effective value of pixel B can increase.Therefore, as shown in figure 15, although be the zone that should carry out white demonstration, oblique line subregion other white regions of its brightness ratio (zone that comprises pixel A) that comprise pixel B increase to some extent, and the oblique line part can be turned white.
And as shown in Figure 8, when being mixed with each row horizontal stripe pattern in the image to display, because the induced distortion of other types, should carry out equally in the pixel A, pixel B of white demonstration, the brightness of the brightness ratio pixel B of pixel A is low.Therefore, as shown in figure 17, the oblique line part can be turned black.Specifically, during alternating signal FR polarity is not overturn, be added on the signal electrode Xa voltage Xa as shown in figure 16, scan electrode Yd～Yd+9 is being carried out scan period, every one scan clock LP, between voltage V2 and V4, overturn.Even and if signal electrode Xb scans arbitrary scan electrode Y1～YM, also owing to carried out lighting instruction, signal electrode Xb voltage still is certain value (being V2 here), does not change.
Here, above-mentioned scan electrode Yd～Yd+9 is carried out scan period, that add on the scan electrode Yc is non-selection voltage V3, but to the scanning of scan electrode Yd line feed to the scanning of scan electrode Yd+1 the time, many signal electrode X ... (electrode of 9N/10), the voltage that adds is changed to voltage V4 from voltage V2, and the electrode of last N/10, institute's voltage that adds still do not have to change for voltage V2.Therefore, scan electrode Yc goes up at voltage V3 has induced noise to take place to voltage V4 direction.Equally, to the scanning of scan electrode Yd+2 the time, scan electrode Yc goes up at voltage V3 has induced distortion to take place to voltage V2 direction to the scanning of scan electrode Yd+1 line feed.
Thereby when showing pattern shown in Figure 8, scan electrode Yc repeats to take place induced distortion every 1 row.This induced distortion as shown in figure 16, the effect make the effective value of pixel A drive waveforms (Xa-Yc) reduce.In addition, reducing and increasing of the caused effective value of induced distortion alternately takes place in pixel B shown in drive waveforms among Figure 16 (Xb-Yc).Therefore, on average, effective value is close to and does not reduce.Therefore, the brightness of the brightness ratio pixel B of pixel A is little, even if be that the same white zone that shows is carried out in instruction mutually, oblique line shown in Figure 17 subregion shows secretly than all the other white viewing areas, and the oblique line part can shade.
And second kind of demonstration is inhomogeneous, and then betiding image for example shown in Figure 10, shown is the occasion that is mixed with per 1 pixel crenellation pattern.Specifically, during the polarity of alternating signal FR was not overturn, the voltage Xb that signal electrode Xb is added was carrying out scan period to scan electrode Yd～Yd+9 as shown in figure 18, overturns between voltage V2 and voltage V4 every one scan piece LP.And the voltage Xa that signal electrode Xa is added, even if the occasion that arbitrary scan electrode Y1～YM is scanned still is the bright numerical value (be V2) of expression here, and not variation.
Here, scan electrode Yc goes up above-mentioned scan electrode Yd～Yd+9 is being carried out scan period, and that add is non-selection voltage V3.And display pattern is as shown in figure 10, is per 1 pixel crenellation pattern, during the scan line line feed, and adjacent signal electrode X ... between the mutual reverse variation voltage of output, transition current is separately cancelled out each other.Therefore, scan electrode Yc goes up to be close to signal electrode X does not take place ... the caused induced distortion of change in voltage.
But compared pixels A and pixel B, voltage does not overturn among the signal electrode Xa that pixel A connected, and the signal electrode Xb that pixel B connected, and then is enter a new line each time counterpoise complex voltage upset and liquid crystal capacitance discharged and recharged of scan line.Therefore, as shown in figure 18, discharge and recharge the passivation of caused integrated waveform among the waveform Xb of signal electrode Xb.So the drive waveforms of pixel B (Xb-Yc) effective value reduces, the brightness of pixel B is compared with the brightness of pixel A, also can reduce.Therefore, carry out same white demonstration although all instruct mutually, oblique line shown in Figure 19 subregion is compared with remaining white viewing area, can show secretlyer.
For example Japanese publication communique " spy opens flat 2-89 communique " has disclosed following formation (after this being called first prior art) in (open day January 5 nineteen ninety), so that show that at above-mentioned first and second kinds first kind of demonstration of inhomogeneous central reduction is inhomogeneous.Specifically, when induced distortion causes as its effective value increase of correction object pixels, go up the correction voltage that its numerical value of superposition reduces effective voltage, export to signal electrode X1～XN in common output voltage V 2 (V4).And induced distortion is when causing effective value to reduce, and goes up the correction voltage that its numerical value of superposition increases effective value in output voltage V 2 (V4) usually.
And for example Japanese publication communique " spy opens flat 8-292744 communique " has disclosed following formation (after this being called second prior art) in (open day on November 5th, 1996), so that it is inhomogeneous to reduce by second kind of demonstration.Specifically, institute adds waveform, and passivation although effective value descends, adds the correction voltage that effective value is increased with each scan period alive variation of institute, so that can compensate the decline of this effective value.
But in above-mentioned first prior art, need to drive 2 voltages (V2, V4) setting effective value increase of usefulness with reducing to revise voltage with regard to signal electrode respectively with these 2 kinds with effective value.Therefore produce such problem, need 6 kinds of current potentials as the signal electrode output potential, so circuit scale is big, manufacturing cost rises.
In addition, above-mentioned first and second prior aries, demonstration is inhomogeneous or second kind of demonstration is inhomogeneous all only to revise first kind, thereby it is inhomogeneous to revise another kind of demonstration, is difficult to guarantee enough display qualities.In addition, inhomogeneous in order to revise first and second kinds of demonstrations, first prior art constitutes and second prior art constitutes if independently be provided with, and circuit scale is further increased, and manufacturing cost raises.
The present invention is just in order to address the above problem, and its purpose is, but by the low cost of practicability, realizes a kind of liquid crystal indicator inhomogeneous, that display quality is high that do not show.
Summary of the invention
In order to achieve the above object, liquid crystal indicator of the present invention is characterized in that, comprising: be provided with liquid crystal layer between cross one another a plurality of signal electrodes and a plurality of scan electrode, according to the LCDs of the video data driving of representing display image;
On above-mentioned each signal electrode, add the signal end drive division of above-mentioned video data institute corresponding voltage;
Generation is respectively revised one to one with corresponding described each voltage of video data and is used voltage, and each correction that is generated is substituted described each voltage with voltage, exports to the correction power supply of described signal end drive division; With
The first correction determination portion, be applied to output electrode number that voltage potential on described each signal electrode changes number and revise voltage according to described signal end drive unit and determine that each revises application time with voltage as correction, so that revise the variation of offsetting the effective voltage value that is applied to liquid crystal layer with the application time difference of voltage by each.
In the above-mentioned formation, scan electrode generation induced distortion makes to be added to the variation of the effective value on pairing each liquid crystal cell of intersection point between this scan electrode and each signal electrode, and the first correction determination portion is just adjusted with the application time of voltage each correction.Therefore, be added to the effective value on each liquid crystal cell, can be according to the pairing voltage of video data and correction with the MAD of the difference between voltage and application time with adjustment.
Here, add that above-mentioned each time set of revising with voltage is, can offset the variation that is added to the effective voltage value on the above-mentioned liquid crystal by difference separately.So, to revise one to one and use voltage although above-mentioned correction is only exported with each voltage with power supply, liquid crystal indicator can suppress each pixel intensity inhomogeneous (first kind of demonstration is inhomogeneous) that induced distortion causes.
Therefore, can provide a kind of and compare with the prior art of voltage with 2 corrections of each voltage output, circuit constitutes simply, can more low-cost manufacturing, and it is inhomogeneous to suppress first kind of demonstration that induced distortion causes, the liquid crystal indicator that can carry out the high demonstration of display quality.
Above-mentioned liquid crystal indicator, also can comprise one second correction determination portion, when in described each signal electrode during with the corresponding change in voltage of described video data, be controlled to be from described signal end drive division output described each revise and substitute this voltage with 1 in the middle of the voltage.
Utilize above-mentioned formation, during with the corresponding change in voltage of above-mentioned video data, export above-mentioned each correction with 1 in the voltage to above-mentioned each signal electrode.Therefore, even if the waveform that exports signal electrode to is the occasion of passivation with the variation of the corresponding voltage of video data, the variation of the effective voltage value that this waveform passivation causes applies with voltage and offsets by this correction, and it is inhomogeneous to suppress second kind of demonstration that the waveform passivation caused.
Therefore, do not need to make and revise the correction usefulness voltage number that can export with power supply and increase.Just can realize to carry out the liquid crystal indicator of the higher demonstration of display quality.
Other purposes of the present invention, feature and advantage can become clear by following explanation.And can understand in the middle of the explanation that rights and interests of the present invention are carried out with reference to accompanying drawing below.
Description of drawings
Shown in Fig. 1 is one embodiment of the invention, is that the expression liquid crystal indicator is wanted the block diagram of portion.
Fig. 2 further describes the block diagram that distortion corrected signal generating unit constitutes in the above-mentioned liquid crystal indicator.
Fig. 3 is the block diagram of signal end driving circuit configuration example in the above-mentioned liquid crystal indicator of expression.
Fig. 4 is the oscillogram of the above-mentioned signal end driving circuit action of expression.
Shown in Fig. 5 is the demonstration example of above-mentioned liquid crystal indicator, is the key diagram of the shown display pattern of expression when comprising vertical elongate pieces.
Fig. 6 is the oscillogram of expression above-mentioned liquid crystal indicator action when showing above-mentioned display pattern.
Fig. 7 is the key diagram that the signal that causes of expression load difference applies wave form varies.
Shown in Fig. 8 is the demonstration example of above-mentioned liquid crystal indicator, is the key diagram of the shown display pattern of expression when comprising vertical elongate pieces.
Fig. 9 is the oscillogram of expression above-mentioned liquid crystal indicator action when showing above-mentioned display pattern.
Shown in Figure 10 is the demonstration example of above-mentioned liquid crystal indicator, is the key diagram of the shown display pattern of expression when comprising the horizontal rectangular pattern of per 1 picture point.
Figure 11 is the oscillogram of expression above-mentioned liquid crystal indicator action when showing above-mentioned display pattern.
What Figure 12 illustrated is the variation of above-mentioned liquid crystal indicator, is the key diagram that the expression signal that load difference caused applies wave form varies.
Shown in Figure 13 is conventional example, is the block diagram that the expression liquid crystal indicator wants portion to constitute.
The oscillogram of above-mentioned liquid crystal indicator action when Figure 14 is expression displayed map 5 display patterns.
Figure 15 is the key diagram that the above-mentioned liquid crystal indicator of expression shows the result of above-mentioned display pattern.
The oscillogram of above-mentioned liquid crystal indicator action when Figure 16 is expression displayed map 8 display patterns.
Figure 17 is the key diagram that the above-mentioned liquid crystal indicator of expression shows the result of above-mentioned display pattern.
The oscillogram of above-mentioned liquid crystal indicator action when Figure 18 is expression demonstration Figure 10 display pattern.
Figure 19 is the key diagram that the above-mentioned liquid crystal indicator of expression shows the result of above-mentioned display pattern.
Embodiment
According to Fig. 1 to Figure 12 one embodiment of the invention is described as follows.
The liquid crystal indicator of present embodiment is to drive simple nematic crystal display screen by the voltage method of average, according to the device of video data display image.This liquid crystal indicator comprises LCDs 1 as shown in Figure 1, signal end driving circuit (signal end drive unit) 2, scanning end driving circuit 3, control circuit 4 and power circuit (revise and use power supply) 5.
In addition, below for convenience of explanation, each electrode X1～XN, Y1～YM during assigned position or during general name, do not omit subscript and carry out reference like this according to for example signal electrode X.And during assigned position, then mark 1～N, 1～M itself, or be the arbitrary integer i in 1～N scope, the arbitrary integer j in 1～M scope, carry out reference as locative subscript.
In the above-mentioned formation, scan each scan electrode Y1～YM successively, scanning end driving circuit 3 is according to scan clock LP, alternating signal FR and the scanning start signal FLM of control circuit 4 outputs, add selection voltage V1 or the V5 that power circuit 5 provides to selected scan electrode Y, and to non-selected each scan electrode Y ... add the non-selection voltage V3 of power circuit 5 outputs.And signal end driving circuit 2, is added to signal voltage V2a or V4a on each signal electrode X1～XN according to video data D according to video data D, data shift clock CK, scan clock LP and the alternating signal FR of control circuit 4 outputs.Here, above-mentioned voltage V1～V5 is set at and sets up following inequality (1).
V1＞V2a＞V3＞V4a＞V5 …(1)
In addition, for the liquid crystal to LCDs 1 carries out AC driving, signal end driving circuit 2 is according to alternating signal FR, represents to switch output voltage V 2a or voltage V4a when effective at video data, and scanning end driving circuit 3 switches output voltage V 1 or voltage V5.
Thus, part (liquid crystal capacitance between scan electrode Yj and the signal electrode Xi in the middle of the liquid crystal of LCDs 1, pixel PIX (i, j)) adds the potential difference (PD) correspondent voltage with two electrode Xi, Yj, and this part transmitance changes according to the effective voltage that is added on the liquid crystal capacitance.So, can be added to voltage on each signal electrode X1～XN and the scan electrode Y1～YM by control, (N, show state M) show the image according to video data to all pixel PIX (1, the 1)～PIX in the control LCDs 1.In addition, below for convenience of explanation, though explanation is the situation that LCDs 1 negative-appearing image shows, promptly effective voltage becomes situation big thereby that each pixel PIX brightens and shows, also is suitable for certainly and carries out the situation that erect image shows in contrast.
Here, the liquid crystal indicator of present embodiment, for suppress first kind show inhomogeneous and second kind of demonstration inhomogeneous both, be the sweep signal waveform in scan electrode Y one side induced signal change in voltage and distortion produced that first kind of second kind of demonstration that causes this signal voltage passivation to be produced to discharging and recharging of liquid crystal capacitance that shows that inhomogeneous and signal voltage changes to cause is inhomogeneous, also have following formation.
Specifically, the voltage generating unit 51 of power circuit 5 also can generate and revise with voltage V2s, V4s except being generally used for voltage V1, V2, V3, V4, the V5 of liquid crystal drive.In addition, power circuit 5 also be provided with select among voltage V2, the V2s any with output as the switch 52 of signal voltage V2a with select among voltage V4, the V4s any with the switch 53 of output as signal voltage V4a.
Above-mentioned two switches 52,53 are as mentioned below, according to the result of determination of distortion corrected signal generating unit (first correction is determined device) 6 and control signal S1, the S2 that passivation corrected signal generating unit (second correction is determined device) 7 signals that generated are carried out 8 outputs of comprehensive comprehensive corrected signal generating unit, control conduction and cut-off.Liquid crystal indicator is poor by two switches, 52,53 conducting intervals, and increase and decrease is added to the effective voltage mean value on the above-mentioned liquid crystal capacitance.Thus, although each voltage V2, V4 only are provided with correction with voltage V2s, V4s, can suppress above-mentioned first and second kinds show inhomogeneous both.
Below, for convenience of explanation, what illustrate is to revise with voltage V2s, V4s to be set at the value that effective voltage is increased with respect to common output voltage V 2, V4, is set at the situation of V2＜V2s, V4＞V4s specifically, but also can as mentioned belowly be set at the value that effective voltage is reduced.
And above-mentioned distortion corrected signal generating unit 6 is counted DRQ1 and the output electrode number K1 that revises voltage V2s according to video data D according to V2 one side potential change, and the numerical value T1 that uses voltage V2s output time is revised in the output expression.And, according to video data D, counting DRQ2 and the output electrode number K2 that revises voltage V4s according to V4 one side potential change, the numerical value T2 that uses voltage V4s output time is revised in the output expression.In addition, the following describes above-mentioned variation and count DRQ1, DRQ2 and output electrode number K1, K2.
Specifically, in the present embodiment, make above-mentioned variation count the corresponding reference value of DRQ1, DRQ2 and be respectively VAL1, VAL2, above-mentioned modified value T1, T2 can be obtained by following formula (2) and formula (3).
T1＝VAL1+K1×VAL3 …(2)
T2＝VAL2+K2×VAL3 …(3)
In addition, in formula (2) and the formula (3), VAL3 is a correction factor, can be set arbitrarily by parameter setting portion 9.And in the present embodiment, be set at the numerical value that the effective value that makes the driving voltage that pixel adds increases owing to revise with voltage V2s, V4s, thereby the change that above-mentioned each reference value VAL1, VAL2 are set at each variation number DRQ1, DRQ2 increases greatly.
And, distortion corrected signal generating unit 6, by in the middle of the tables of data of parameter setting portion (parameter memory storage) 9 storages, reading respectively and above-mentioned two variation number DRQ1, the corresponding numerical value of DRQ2, read above-mentioned each reference value VAL1, VAL2 and correction factor VAL3.Specifically, distortion corrected signal generating unit 6 as for example shown in Figure 2 comprises data number storage part 61, preceding line data number storage part 62, changes number test section 63, access portion 64, data number obtaining section 65 and modified value determination portion (weighting device) 66.
The video data D of 61 pairs of the data number storage parts a certain scan lines of expression (j is capable), (the data number a) to store the occurrence number of another signal voltage of its numeric representation (for example V4).Preceding 62 pairs of line data number storage parts are represented the video data D of scan line (j-1 is capable) before this, store the occurrence number (data number b) of the above-mentioned signal voltage of its numeric representation.Change number test section 63 relatively data number a, the b of two scan lines (j is capable and j-1 is capable), obtain above-mentioned two and change number DRQ1, DRQ2.Access portion 64 changes number DRQ1, DRQ2 according to two access is carried out in above-mentioned parameter configuration part 9, obtains said reference value VAL1, VAL2 and correction factor VAL3.Data number obtaining section 65 can be obtained the capable V2s output electrode of j number K1 (hereinafter claiming data number K1) and V4s output electrode number K2 (hereinafter claiming data number K2) with reference to above-mentioned data number storage part 61.Modified value determination portion 66 is obtained above-mentioned modified value T1, T2 according to above-mentioned each numerical value VAL1～VAL3, K1, K2 and above-mentioned formula (2), formula (3).
In addition, except video data D, distortion corrected signal generating unit 6 also adds its phase place than the above-mentioned alternating signal FR alternating signal FRa in leading 1 scan line cycle by control circuit 4, obtains corresponding between the scanning impulse LP of time and video data D and voltage V2, the V4 to judge expression video data D.
When above-mentioned alternating signal FRa was high level, corresponding with voltage V4 among the video data D was video data D by (secretly).Thereby the video data D that 61,62 pairs of expressions of above-mentioned two data number storage parts end counts, just can obtain the capable and j-1 of j capable in output number a, the b of voltage V4.Otherwise when alternating signal FRa was low level, the video data of conducting (bright) was corresponding with voltage V4.Thereby, the video data D that represents conducting among the video data D is counted, just can obtain output number a, the b of voltage V4.
Here, the number that the number that the number that the number that order becomes the signal electrode X of V2 level from the V2 level is Sa, become the signal electrode X of V4 level from the V2 level is Sb, become the signal electrode X of V2 level from the V4 level is Sc, become the signal electrode X of V4 level from the V4 level is the words of Sd, among each signal electrode X1～XN corresponding with before this scan electrode Yj-1, the output electrode number b of V4 level is Sc+Sd.And the output electrode number a of V4 level is Sb+Sd among next scan electrode Yj.Thereby it is Sc-Sb that DRQ1 is counted in the variation of voltage V2, specifically, is that V4 becomes the poor of the signal electrode number of V2 and signal electrode number that V2 becomes V4.Equally, to count DRQ2 be Sb-Sc in the variation of voltage V4.
Thereby above-mentioned variation is counted test section 63 and can be obtained and change number DRQ1, DRQ2 according to above-mentioned two output number a, b.But in the present embodiment, it is easy to make the access of above-mentioned parameter configuration part 9, thereby avoiding making two, to change number DRQ1, DRQ2 be negative.Specifically, shown in following formula (4) and formula (5), the actual change number is added that the setting value that the biasing N identical with the total electrode number of 1 scan line obtains is variation number DRQ1, DRQ2.
DRQ1＝N+(b-a) …(4)
DRQ2＝N+(a-b) …(5)
Thus, use when for example memory storage such as ROM, RAM is realized parameter setting portion 9, this variation can be counted DRQ1, DRQ2 as the address number that parameter setting portion 9 is carried out appointment, the time in the time of can reducing access.
In addition, in above-mentioned formula (4), the formula (5), be that signal electrode is counted N, but, also can be set at the above numerical value of N as long as DRQ1, DRQ2 are counted in above-mentioned variation to be included above-mentioned memory storage in and can obtain in the address realm with offset control.
And parameter setting portion 9 is shown in following table 1, and the storage change number (DRQ1, DRQ2) and corresponding reference value (VAL1, VAL2) both combinations with it.
(table 1)
| Change number | 0 | N/10 | 2N/10 | … | N | … | 18N/10 | 19N/10 | 2N |
| Reference value | α0 | α1 | α2 | … | α3 | … | α4 | α5 | α6 |
In the present embodiment because above-mentioned correction is set at the numerical value that makes its effective value increase of driving voltage that pixel adds with voltage V2s, V4s, thereby in the above-mentioned table 1, each reference value alpha 0～α 6 be set at α 0＜α 1＜...＜α 3＜...＜α 4＜α 5＜α 6.
And above-mentioned passivation corrected signal generating unit 7 is to signal end driving circuit 2 output corrected impulse signal S0a, inhomogeneous to suppress second kind of demonstration to comprehensive corrected signal generating unit 8 output corrected impulse signal S0.Comprehensive corrected signal generating unit 8 is therefore during output corrected impulse signal S0, revise with voltage V2s, V4s to power circuit 5 instruction outputs, simultaneously, signal end driving circuit 2 as shown in Figure 4, going up video data D according to each signal electrode X has no change, determines whether to transmit the variation of revising with voltage V2s, V4s to each signal electrode X1～XN.
The pulse width of corrected impulse signal S0 is identical with said reference value VAL1, VAL2 etc., can determine according to the modified value VAL that reads in the middle of the tables of data of above-mentioned parameter configuration part 9 storages.And selected be the occasion that signal end driving circuit 2 can't transmit variation, corrected impulse signal S0a is set at the pulse width above corrected impulse signal S0, and add simultaneously or by the time of doing sth. in advance with corrected impulse signal S0, with the change in voltage (change in voltage of corrected impulse signal S0) of the pulse width of avoiding transmitting corrected impulse signal S0.In addition, in the present embodiment, two corrected impulse signal S0, S0a can add simultaneously by mutual identical pulse width.
Here, above-mentioned signal end driving circuit 2 is for example shown in Figure 3, comprises shift register 21, A latch 22, B latch (latch cicuit) 23, output control circuit 24, level shifter 25 and output driver 26.
(table 2)
| FR | Dj-1 | Dj | S0a | Output state | Actual output potential |
| Low level L | Low level L | Low level L | Low level L | V2a | V2 |
| High level H | HZ | V2 | |||
| High level H | Low level L | Low level L | V2a | V2 | |
| High level H | V2a | V2s | |||
| Low level L | High level H | Low level L | V4a | V4 | |
| High level H | V4a | V4s | |||
| High level H | High level H | Low level L | V4a | V4 | |
| High level H | HZ | V4 | |||
| High level H | Low level L | Low level L | Low level L | V4a | V4 |
| High level H | HZ | V4 | |||
| High level H | Low level L | Low level L | V4a | V4 | |
| High level H | V4a | V4s | |||
| Low level L | High level H | Low level L | V2a | V2 | |
| High level H | V2a | V2s | |||
| High level H | High level H | Low level L | V2a | V2 | |
| High level H | HZ | V2 |
In the above-mentioned table 2, Dj, Dj-1 represent respectively in the middle of separately the signal electrode X, for the video data D of this scan line (j is capable) and the video data D of last scan line (j-1 is capable).And " output state " expression output driver 26 is to the output state of signal electrode X, and " actual output potential " then represents result that output state is controlled, the actual current potential that exports each signal electrode X to.
In addition, transmission data that also can not near signal end driving circuit 2 are as video data D, but as the output potential data, the alternating signal FR that offers this signal end driving circuit 2 are fixed as " high level H ".During this constitutes, even if the scan line during alternating signal FR upset also can change control according to the output potential of signal electrode X and revise application time with voltage, thereby can carry out more correct corrective action.At this moment also can realize by enough simple logical circuits.
On the other hand, comprehensive corrected signal generating unit 8 is according to modified value T1, the T2 of above-mentioned distortion corrected signal generating unit 6 notices, corrected impulse signal S0 with above-mentioned passivation corrected signal generating unit 7 outputs, to two switches, 52,53 output control signal S1, S2, so that as Fig. 6, Fig. 9 and shown in Figure 11, shown in the corrected impulse signal S0 shown in time and the modified value T1 during the time of length, switch 52 equal conductings, shown in the corrected impulse signal S0 shown in time and the modified value T2 during the time of length, switch 53 equal conductings.
Here, in the middle of the control signal S1 (S2), the pairing pulse P1 of modified value T1 (T2) (P2) with the nonoverlapping words of the pairing pulse P0 of corrected impulse signal S0, can be set at random time with zero-time.If but zero-time too lags behind, when modified value T1 (T2) is maximum, just have with pulse P1 (P2) in the one scan is still unclosed may.Therefore, zero-time is controlled to be the time of doing sth. in advance to a certain degree in one scan, and pulse P1 (P2) is finished.
And above-mentioned parameter configuration part 9 is by for example custom circuits such as memory storage such as RAM, ROM, computing circuit, or their combination realizes that the outside of liquid crystal indicator can be to above-mentioned two corrected signal generating units, 6,7 instructions above-mentioned each numerical value VAL, VAL1～VAL3.
For showing that to first and second kinds uneven inhibition course of action and existing formation contrast and be described as follows in the above-mentioned formation.
Specifically, in the time of will on LCDs 1, showing display pattern shown in Figure 5, especially in the prior art of voltage not being revised, as shown in figure 14, whenever alternating signal FR upset, effective value just changes with the induction distortion, just can be as shown in figure 15, the brightness of the brightness ratio pixel A of pixel B increases, and it is inhomogeneous that first kind of demonstration takes place.
Different therewith, in the present embodiment, the video data D that adds is when representing identical display pattern, among Fig. 6, shown in d+1 for example was between the departure date, voltage V2a became to revise in during shown in the signal S1 and use voltage V2s, and voltage V4a becomes correction voltage V4s in during shown in the signal S2.So, be modified to the drive waveforms (Xa-Yc) of pixel A and the drive waveforms (Xb-Yc) of pixel B as shown in the figure.Therefore, can revise the effective value difference that induced distortion causes, the brightness of pixel A is identical with the brightness of pixel B, thereby it is inhomogeneous to suppress first kind of demonstration.
Specifically, before the scanning of scanning end driving circuit 3 beginning d+1 line scanning row, transmit the capable and capable video data D of d of d+1 to signal end driving circuit 2.And occurrence number a, the b of V4 potential level in each row is stored in data number storage part 61 shown in Figure 2 and preceding line data number storage part 62.So, change number test section 63 according to this numerical value a, b, obtain the variation of voltage V2 and V4 and count DRQ1, DRQ2, access portion 64 changes number DRQ1, DRQ2 to 9 instructions two of parameter setting portion, obtains this reference value VAL1, VAL2.
Here, comprise in the display pattern of vertical elongate pieces pattern shown in Figure 5, as shown in Figure 6, alternating signal FR is when capable and d+1 overturns between capable at d, during d is capable the signal electrode X of V4 potential level ... number (count value b) be that (9N/10) is individual, be the signal electrode X of V4 potential level during d+1 is capable ... number (count value is that (N/10) is individual a).So, change number test section 63 according to above-mentioned formula (4) and formula (5), judge that counting DRQ1 with the corresponding variation of voltage V2 is that (18N/10) is individual, counting DRQ2 with the corresponding variation of voltage V4 is that (2N/10) is individual.
Therefore, in the middle of parameter setting portion 9, read corresponding numerical value α 4, as adding the reference value VAL1 that revises with the basic interval of voltage V2s with (18N/10).Equally, read corresponding numerical value α 2, as adding the reference value VAL2 that revises with the basic interval of voltage V4s with (2N/10).In addition, passivation corrected signal generating unit 7 is according to the numerical value VAL that obtains from parameter setting portion 9, and exporting its pulse width is corrected impulse signal S0, the S0a of VAL.
And data number obtaining section 65, according to d+1 capable in the output number of times a of voltage V4, obtain (9N/10), (N/10) output number of times K1, K2 as voltage V2, V4 in this row.Modified value determination portion 66 is revised above-mentioned each basic interval according to above-mentioned formula (2) and formula (3) according to above-mentioned numerical value, from the numerical value VAL3 that parameter setting portion 9 obtains, and modified value T1, the T2 with voltage V2s, V4s application time revised in the output expression.
Then, comprehensive corrected signal generating unit 8, according to above-mentioned corrected impulse signal S0 and modified value T1, T2, output control signal S1, S2.Specifically, the control signal S1 that is formed by the pulse P1 of the pulse P0 of comprehensive corrected signal generating unit 8 output pulse width VAL and pulse width (α 4+9N/10, VAL3), and the control signal S2 that formed of the pulse P2 of output pulse P0 and pulse width (α 2+N/10, VAL3).
Here, from d capable to d+1 capable, alternating signal FR overturns, thus the voltage Xa (Xb) of each signal electrode Xa (Xb) also must the upset.So, signal end driving circuit 2 shown in above-mentioned table 2, during shown in the corrected impulse signal S0a in the output of output driver 26, be not high impedance, and control becomes voltage V2a (V4a).Therefore, during the above-mentioned pulse P0, add on the signal electrode Xa to revise and use voltage V2s, add on the signal electrode Xb to revise and use voltage V4s.So as shown in Figure 6, the drive waveforms of each pixel A, B (Xa-Yc), (Xb-Yc) are modified to, its effective value of the driving voltage that adds on the pixel during the above-mentioned pulse P0 increases.Therefore, the waveform passivation that can utilize each signal electrode Xa, Xb change in voltage to be caused makes effective value increase the part that effective value reduced, and suppresses second kind of inhomogeneous generation of demonstration that the waveform passivation is caused.
And the pulse width of above-mentioned pulse P1 then is set at longlyer than pulse P2 pulse width, thereby the correction that adds on the signal electrode Xa than adding that to signal electrode Xb the time of revising with voltage V4s is long, can be carried out bigger correction with voltage V2s to effective value.Therefore, for comprising pixel that induced distortion that non-selected scan electrode Yc produced reduces effective value, being that pixel A is in interior V2 output terminal pixel, with comprise pixel that above-mentioned induced distortion increases effective value, be that pixel B is compared in interior V4 output terminal pixel, can carry out bigger correction.
Equally, in (d+4) row that alternating signal FR overturns once more, the signal electrode Xa that is associated with pixel A adds in only during T2=α 4+9N/10, VAL3 to revise and use voltage V4s, and the signal electrode Xb that is associated with pixel B only adds correction voltage V2s in T2=α 2+N/10, the VAL3 during short by comparison.Therefore, for comprise pixel that induced distortion reduces effective value, be pixel A in interior V4 output terminal pixel, and comprise pixel that induced distortion increases effective value, be that pixel B is compared in interior V2 output terminal pixel, can carry out bigger correction.
On the other hand, for example as the situation that scan electrode Yd+2 is scanned, when alternating signal FR did not overturn, output voltage did not change, thereby it is inhomogeneous that second kind of demonstration that the waveform passivation caused do not take place.At this moment, the signal end driving circuit 2 of present embodiment during adding corrected impulse signal S0a in, guarantee that output driver 26 is output as high impedance.So although power circuit 5 outputs are during this period revised with voltage V2s, V4s, the output voltage of signal electrode Xa, Xb guarantees that still V2, V4 are constant, signal end driving circuit 2 is not revised effective value.
And when alternating signal FR did not overturn, first kind of demonstration that induced distortion caused is inhomogeneous not to be taken place yet.At this moment, in the present embodiment liquid crystal indicator, it is mutual identical numerical value (N) that voltage V2, V4 change number DRQ1, DRQ2, and above-mentioned two pulse signal P1, P2 basic interval are identical numerical value (α 3).Thereby, comprise pixel A in interior V2 output terminal pixel with comprise pixel B and carry out the correction of same size in interior V4 output terminal pixel.
Therefore, although power circuit 5 only generates V2, V2s, these 4 kinds of voltages of V4, V4s as signal electrode driving voltage, but showing as shown in Figure 5 when comprising the display pattern of vertical elongate pieces pattern, can make the brightness of the brightness of pixel A and pixel B consistent, can prevent that first kind of demonstration is inhomogeneous.
In addition, the modified value determination portion 66 of present embodiment according to the output number of times of voltage V2 and V4, is weighted above-mentioned each pulse P1, P2 basic interval (VAL1, VAL2), so that the output number of times is many more, pulse width is long more.So, to export often, the voltage signal line that capacitive load is bigger can carry out bigger correction to effective value.
Therefore, as shown in Figure 7, load is little more, and signal waveform is passivation more just, and retouch is set up effective value Z1＞Z2, thereby effective value reduces.Therefore, no matter the load size how, if add correction voltage V2s (V4s) in during same, just exists the drive waveforms effective value to change, take place the possibility of brightness irregularities because of the difference of load capacitance.
But the modified value determination portion 66 of present embodiment as mentioned above, according to the output number of times of voltage V2 and V4, to the basic interval weighting, thereby can suppress the drive waveforms effective value difference that capacitive load difference is caused.Thus, can realize that brightness irregularities is few, the liquid crystal indicator of higher display quality.
And will show display pattern shown in Figure 8 the time, the prior art of voltage not being revised especially, as shown in figure 16, whenever switched scan is capable, effective value just can be as shown in figure 17 with induction distortion change, the brightness ratio pixel B brightness of pixel A is low, so it is inhomogeneous that first kind of demonstration takes place.
Different therewith, in the present embodiment, the video data D that adds is when representing identical display pattern, d+1 as shown in for example Fig. 9 is between the departure date, according to d+1 capable in V4 current potential output number of times (count value b) be 9N/10, the V4 current potential was exported number of times (count value is 0 a) during d was capable, obtain and change number DRQ1=N/10, change number DRQ2=19N/10, V2 output number of times K1=N/10 and V4 output number of times K2=9N/10.Therefore, the control signal S1 that the pulse P0 of comprehensive corrected signal generating unit 8 output pulse width VAL and the pulse P1 of pulse width (α 1+N/10, VAL3) are formed, and export the control signal S2 that the pulse P2 of above-mentioned pulse P0 and pulse width (α 5+9N/10, VAL3) is formed.Here, the basic interval α 5 of pulse P2 sets longlyer than pulse P1 basic interval α 1.So, comprise pixel that induced distortion that non-selected scan electrode Yc produced reduces effective value, be that pixel A is in interior V4 output terminal pixel, with comprise pixel that effective value is increased, be that pixel B is compared in interior V2 output terminal pixel, can carry out bigger correction.
And, as (d+2) between the departure date shown in, when the induced distortion that non-selected scan line Yc is taken place trends towards with respect to pixel A, B that both reduce effective value, promptly when two pixel A, B add identical voltage (being V2a this moment), the induced distortion of identical size is revised.In addition, cause second kind to show uneven waveform passivation, can revise with voltage V2s or V4s by output correction in only during pulse P0 during change in voltage.
Therefore, although power circuit 5 only generates 4 kinds of voltages as signal electrode driving voltage, but when shown as shown in Figure 8 display image is mixed with the horizontal rectangular pattern of each row, can make the brightness of pixel A consistent, can prevent that first kind of demonstration is inhomogeneous with pixel B brightness.
At this moment,, basic interval is weighted by output number of times K1, K2 with identical during display pattern in the displayed map 5, thereby, can suppress to export the effective value difference that number of times K1, K2 difference are caused, can realize the liquid crystal indicator of higher display quality.
And will show display pattern shown in Figure 10 the time, the prior art of voltage not being revised especially, as shown in figure 18, voltage waveform signal passivation with the variation of signal voltage, just can be as shown in figure 19, because second kind of demonstration is inhomogeneous, the brightness ratio pixel A of pixel B is low.
Different therewith, in the present embodiment, the video data D that adds is when representing identical display pattern, d+1 as shown in for example Figure 11 is between the departure date, according to d+1 capable in V4 current potential output number of times (count value be that (N/20) is individual a), and to export number of times (count value b) be that (N/20) is individual to the V4 current potential during d was capable, obtain and change number DRQ1=N, change number DRQ2=N, V2 output number of times K1=19N/20 and V4 output number of times K2=N/20.Therefore, the control signal S1 that the pulse P0 of comprehensive corrected signal generating unit 8 output pulse width VAL and the pulse P1 of pulse width (α 3+N/20, VAL3) are formed, and export the control signal S2 that the pulse P2 of above-mentioned pulse P0 and pulse width (α 3+19N/20, VAL3) is formed.
Here, the basic interval of two pulse P1, P2 is set at mutual equal length (α 3).Thus, the voltage that each pixel A, the pairing signal electrode Xa of B, Xb add no matter be voltage V2a or voltage V4a, all carries out the correction of same size, as the correction to induced distortion.So, do not cause two pixel A, the B of luminance difference because of induced distortion, no matter be to revise with voltage V2s or correction to use voltage V4s, all there is not luminance difference to take place.
On the other hand, above-mentioned comprehensive corrected signal generating unit 8 is not only exported above-mentioned induced distortion correction with pulse P1 (P2), also exports with the passivation correction of corrected impulse signal S0a same pulse width and uses pulse P0 as control signal S1 (S2).So, when signal end driving circuit 2 changes as signal electrode Xa during for example d+1 is capable at output voltage, the output of output driver 26 is not high impedance in being controlled to be shown in above-mentioned table 2 during shown in the corrected impulse signal S0a, but voltage V2a (V4a).Otherwise, when output voltage does not change as signal electrode Xa during d+1 is capable, during shown in the corrected impulse signal S0a in the output of output driver 26 keep high impedance, keep output voltage before this.Therefore, the current potential of signal electrode Xa keeps current potential V2 constant during the above-mentioned pulse P0, and signal electrode Xb adds correction voltage V4s.Thus, the drive waveforms of pixel B (Xb-Yc) is modified to that effective value increases during the above-mentioned pulse P0 as shown in figure 11, thereby the mean value of effective value increases that part of that effective value reduces by the waveform passivation.
Therefore, can make two pixel A, B brightness unanimity as shown in figure 10, suppress second kind of inhomogeneous generation of demonstration that the waveform passivation causes.Moreover, be by the correction identical with the waveform distortion correction with voltage V2s, V4s, passivation is revised to waveform, thereby revises with the occasion of voltage and compare with both are set respectively, can dwindle the circuit scale of power circuit 5.
And, at this moment with displayed map 5 in identical during display pattern, also basic interval is weighted by output number of times K1, K2, thereby, can suppress to export the effective value difference that number of times K1, K2 difference are caused, can realize the liquid crystal indicator of higher display quality.
Here, be induced distortion or waveform passivation to occur and show that uneven display patterns are example for caused first and second kinds with the easiest, illustrate that two kinds show what inhomogeneous inhibition was moved, but as mentioned above, because it is inhomogeneous to eliminate two kinds of demonstrations that induced distortion, waveform passivation caused, even if it is inhomogeneous also can to reduce above-mentioned two kinds of demonstrations for other patterns, can realize the liquid crystal indicator that display quality is high.
In addition, present embodiment is to revise that to be set at the situation that effective voltage is increased with voltage V2s, V4s be that example illustrates with each, makes effective voltage reduce also can obtain same effect but be set at.At this moment, in the above-mentioned table 1, each reference value alpha 0～α 6 be set at α 0＞α 1＞α 2＞...＞α 3＞...＞α 4＞α 5＞α 6.And, for example logic of output control circuit 24 is changed etc., signal end driving circuit 2 carries out action shown in the following table 3 and gets final product to substitute above-mentioned table 2.
(table 3)
| FR | Dj-1 | Dj | S0a | Output state | Actual output potential |
| Low level L | High level H | Low level L | Low level L | V2a | V2 |
| High level H | HZ | V2 | |||
| Low level L | Low level L | Low level L | V2a | V2 | |
| High level H | V2a | V2s | |||
| High level H | High level H | Low level L | V4a | V4 | |
| High level H | V4a | V4s | |||
| Low level L | High level H | Low level L | V4a | V4 | |
| High level H | HZ | V4 | |||
| With level H | High level H | Low level L | Low level L | V4a | V4 |
| High level H | HZ | V4 | |||
| Low level L | Low level L | Low level L | V4a | V4 | |
| High level H | V4a | V4s | |||
| High level H | High level H | Low level L | V2a | V2 | |
| High level H | V2a | V2s | |||
| Low level L | High level H | Low level L | V2a | V2 | |
| High level H | HZ | V2 |
In addition, identical with Fig. 7 occasion as shown in figure 12 when each correction is set at the minimizing effective voltage with voltage V2s, V4s, when load is big, apply the more passivation of waveform.But different with occasion shown in Figure 7, retouch is set up effective value Z3＜Z4.So when at this moment 66 pairs of basic intervals of modified value determination portion were revised, output number of times K1, K2 were few more, load is few more, on augment direction weighted volumes is revised more, just can prevent the generation of the brightness irregularities that load capacitance difference is caused.
And the distortion corrected signal generating unit 6 of present embodiment, explanation be the situation of the V4 level being counted every the scan line cycle, but can certainly count the V2 level.But at this moment exchange above-mentioned formula (4) and formula (5), for example change number DRQ1 and obtain by formula (5) the right.
In addition, in the present embodiment, configuration example as distortion corrected signal generating unit 6 and parameter setting portion 9, be to be the situation that directly read from this address the address to change number+be offset, promptly changing number, to get the situation of N kind numerical value be that example describes, but when requiring parameter setting portion 9 memory capacity to cut down, but also can be to for example changing number divided by setting etc., narrow down to and fully to reduce to show uneven degree changing the obtained scope of number.
And, present embodiment, be that to read the situation that reference value VAL1, VAL2 obtain modified value T1, T2 in the middle of the tables of data of parameter setting portion 9 storage with distortion corrected signal generating unit 6 be that example describes, as long as but can suitably increase and decrease modified value T1, T2 according to the increase and decrease that changes number, also can obtain by arithmetic expression.In addition, even if comparable data expression shape also can not read reference value VAL1, VAL2 itself, and read correction factor etc. in order to obtain the numerical value of reference value VAL1, VAL2.
But most of occasions, determine difficulty of suitable arithmetic expression, thereby, for example change number with regard to each, the limit changes modified value T1, T2, and the demonstration that limit observation LCDs 1 takes place is inhomogeneous etc., obtain the modified value T1, the T2 that show inhomogeneous minimum, this modified value T1, T2 are stored in the method in the tables of data, and available more ball bearing made using constitutes, and more suitably reduces to show inhomogeneous.Same reason, to correction factor VAL3 or pulse width VAL, the method for comparable data table, also available more ball bearing made using constitutes, and obtains more suitably to eliminate to show uneven numerical value.
In addition, in the present embodiment, two switches 52,53 of power circuit 5 have 2 times (pulse P0 two edges) to switch to second kind of inhomogeneous correction purposes of demonstration, have 2 times (pulse P1 (P2) two edges) to switch to first kind and show inhomogeneous correction purposes, but be not limited thereto.For example, comprehensive corrected signal generating unit 8 also can generate the single pulse that control signal S1 meets as pulse P0, P1, generates the single pulse that control signal S2 meets as pulse P0, P2.Even if this situation uses the application time of voltage V2s, V4s identical as long as revise, just can obtain same effect.In addition, during this constituted, the power supply switching times reduced to 2 times from 4 times, thereby, can reduce the consumed power of logic and power circuit part.
Liquid crystal indicator of the present invention, be a kind of liquid crystal indicator that drives above-mentioned LCDs according to above-mentioned video data, constitute except above-mentioned signal end drive unit and revise with the power supply, comprise that also first correction determines device, the number of times of exporting pairing each voltage of above-mentioned video data according to above-mentioned signal end drive unit changes, as correction, with indivedual application times of determining respectively pairing correction with voltage.
Utilize this formation, above-mentioned each correction can change respectively according to each self-corresponding voltage output number of times with the voltage application time to be determined.Therefore, even if scan electrode generation induced distortion, added effective value changes on pairing each liquid crystal cell of intersection point of this scan electrode and each signal electrode and will make, and also can offset the effective value variation that induced distortion causes by the difference of above-mentioned each application time.So, identical with above-mentioned liquid crystal indicator, simple although circuit constitutes, can by more low-cost manufacturing, but can realize that a kind of can to suppress first kind of demonstration that induced distortion causes inhomogeneous, the liquid crystal indicator that can carry out the high demonstration of display quality.
And above-mentioned each above-mentioned first correction that constitutes is determined device, also can constitute to comprise a weighting device, according to exporting the signal electrode number of above-mentioned each correction with voltage, adjusts the application time of above-mentioned each correction with voltage.
Utilize this formation, each revises the application time with voltage, is that the load size is adjusted according to each signal electrode number of revising with voltage of output.Thereby, when load is big, for the drive waveforms of revising each liquid crystal when applying with voltage, even if the signal passivation that is taken place than load hour big occasion, but the effective voltage value that is also added on the caused liquid crystal of offseting signal passivation.Therefore, can realize a kind ofly also suppressing the brightness irregularities that load difference causes, and then can carry out the liquid crystal indicator of the high demonstration of display quality.
And in the middle of above-mentioned each formation, above-mentioned signal end drive unit also can constitute and comprise: the latch cicuit of storing the video data of 1 scan line cycle scale, with according to the output of this latch cicuit, determine the output control circuit of the voltage that applies on each signal electrode, above-mentioned first correction determines that the signal and the phase place in the leading 1 scan line cycle of alternating signal that device is used than driven liquid crystal with reference to phase place export the video data in leading 1 scan line cycle than above-mentioned latch cicuit, determines to export corresponding correction with above-mentioned latch cicuit.
Utilize this formation, can obtain with latch cicuit and export corresponding correction, thereby first correction determine that device can instruct and the synchronous correction of video data according to phase place than leading video data and the alternating signal of latch cicuit output.Therefore, can realize a kind ofly can carrying out more certain correction, can carry out the liquid crystal indicator of the higher demonstration of display quality.
And above-mentioned during each constitutes, above-mentioned first correction determines that device also can constitute and comprises a parameter memory storage that the modified value or the correction factor of above-mentioned each application time time institute reference determined in storage.
Utilize this formation, first correction determines that device passes through modified value or the correction factor with reference to the parameter memory storage, each application time of revising with voltage can be set at optimal values.So, compare with the situation of only obtaining application time by computing, can realize a kind of liquid crystal indicator that constitutes easily, can carry out the higher demonstration of display quality.
Embodiment that elaborates among the present invention or embodiment are the part that the technology of the present invention content is understood after all; be not considered as only limiting to this concrete example with not answering narrow sense; can essence of the present invention and below in the protection domain of the claim put down in writing, make various modifications and implemented.
Claims (10)
1. liquid crystal indicator, the video data according to expression LCDs display image drives this LCDs that is provided with liquid crystal layer between cross one another a plurality of signal electrodes and a plurality of scan electrode, it is characterized in that, comprising:
On described each signal electrode, add signal end drive unit with corresponding each voltage of described video data;
Generation is respectively revised one to one with corresponding described each voltage of video data and is used voltage, and each correction that is generated is substituted described each voltage with voltage, exports to the correction power supply of described signal end drive unit; With
First correction is determined device, be applied to output electrode number that voltage potential on described each signal electrode changes number and revise voltage according to described signal end drive unit and determine that each revises application time with voltage as correction, so that revise the variation of offsetting the effective voltage value that is applied to liquid crystal layer with the application time difference of voltage by each.
2. liquid crystal indicator as claimed in claim 1 is characterized in that, described first correction determines that device comprises a weighting device, according to the signal electrode number of described each correction of output with voltage, described respectively the correction is adjusted with the application time of voltage.
3. liquid crystal indicator as claimed in claim 1, it is characterized in that, comprise that one second correction determines device, when in described each signal electrode during with the corresponding change in voltage of described video data, be controlled to be from described signal end drive unit output described each revise and substitute this voltage with 1 in the middle of the voltage.
4. liquid crystal indicator as claimed in claim 1 is characterized in that, described signal end drive unit comprises: the latch cicuit of storing 1 scan line cycle scale video data; With the output control circuit of the voltage of determining according to the output of this latch cicuit to add to each signal electrode,
Described first correction is determined device, the signal and the phase place in the leading 1 scan line cycle of using than driven liquid crystal with reference to phase place of alternating signal are exported the video data in leading 1 scan line cycle than described latch cicuit, determine to export corresponding correction with described latch cicuit.
5. liquid crystal indicator as claimed in claim 1 is characterized in that, also comprises a parameter setting portion, stores modified value or correction factor that described each application time is determined time institute's reference.
6. liquid crystal indicator as claimed in claim 3, it is characterized in that, comprise with first correction and determine that the device and second correction determine the comprehensive corrected signal generating means that device is connected, determine that by first correction determined application time of device and second correction determine the timing that device instructs, export a control signal with the described correction voltage of instruction output with power supply to described correction.
7. liquid crystal indicator as claimed in claim 1 is characterized in that, according to alternating signal, makes signal that the signal electrode in LCDs applies and the signal that applies on scan electrode carry out driven, thereby to described LCDs driven.
8. liquid crystal indicator as claimed in claim 5 is characterized in that, it changes number and sets according to the number of output and corresponding each voltage of video data for the modified value of described parameter setting portion storage or correction factor.
9. liquid crystal indicator as claimed in claim 5, it is characterized in that, described first correction is determined device, according to the correction that obtains from described parameter memory storage or correction factor and with corresponding each voltage output number of video data, determine described each revise application time with voltage.
10. liquid crystal indicator as claimed in claim 3, it is characterized in that, according to alternating signal, make signal that the signal electrode in LCDs applies and the signal that on scan electrode, applies carry out driven, thereby the described LCDs of driven, described second correction determines that device is controlled to be, and according to the rotary movement of the alternating signal that LCDs added, exports described correction voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP217781/1999 | 1999-07-30 | ||
| JP21778199A JP3473748B2 (en) | 1999-07-30 | 1999-07-30 | Liquid crystal display |
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| CN1282950A CN1282950A (en) | 2001-02-07 |
| CN1162828C true CN1162828C (en) | 2004-08-18 |
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| CNB001224603A Expired - Lifetime CN1162828C (en) | 1999-07-30 | 2000-07-31 | Liquid crystal display device |
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| JP (1) | JP3473748B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006047510A (en) * | 2004-08-02 | 2006-02-16 | Oki Electric Ind Co Ltd | Display panel driving circuit and driving method |
| CN100449364C (en) * | 2004-10-01 | 2009-01-07 | 罗姆股份有限公司 | Method of supplying power to scan line driving circuit, and power supply circuit |
| JP4974623B2 (en) * | 2006-09-14 | 2012-07-11 | ルネサスエレクトロニクス株式会社 | Driving circuit and data driver for flat display device |
| JP5276812B2 (en) * | 2007-08-24 | 2013-08-28 | 新日本無線株式会社 | Driving circuit for liquid crystal display device |
| TWI377553B (en) * | 2008-03-18 | 2012-11-21 | Chimei Innolux Corp | Liquid crystal display and driving method thereof |
| WO2016140158A1 (en) * | 2015-03-05 | 2016-09-09 | シャープ株式会社 | Display device |
| CN105930305B (en) * | 2016-04-14 | 2017-07-21 | 清华大学深圳研究生院 | A kind of three pulses are intersected close to method of guidance |
| US11145269B2 (en) * | 2019-08-02 | 2021-10-12 | Sakai Display Products Corporation | Display apparatus accurately reducing display non-uniformity |
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1999
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| JP3473748B2 (en) | 2003-12-08 |
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