CN1941060A - Liquid crystal display device - Google Patents
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- CN1941060A CN1941060A CN 200610141627 CN200610141627A CN1941060A CN 1941060 A CN1941060 A CN 1941060A CN 200610141627 CN200610141627 CN 200610141627 CN 200610141627 A CN200610141627 A CN 200610141627A CN 1941060 A CN1941060 A CN 1941060A
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Abstract
Disclosed is a liquid crystal display device which includes a plurality of OCB liquid crystal pixels arrayed substantially in a matrix, and a driver circuit which cyclically writes a non-video signal and a video signal as a pixel voltage in each of the liquid crystal pixels. The liquid crystal display device further includes a control circuit which sets a first period and a second period different in length from the first period such that a total time length of the first period and the second period does not exceed one frame period, and controls the driver circuit to execute write of the non-video signal for the liquid crystal pixels in the first period and to execute write of the video signal for the liquid crystal pixels PX in the second period.
Description
Technical field
The present invention relates to be configured to the liquid crystal indicator of a plurality of pixels of rectangular in fact, relate in particular to non-video signal and vision signal and periodically be written to liquid crystal indicator in each pixels of a plurality of liquid crystal pixels as pixel voltage with the polarity driven of periodic inversion.
Background technology
In recent years, the removable product of the liquid crystal boards of packing into such as small game machine, portable PC or mobile phone is popularized fast.
LCD panel generally is that liquid crystal layer is clamped in structure between array base palte and the subtend substrate.When LCD panel was active array type, array base palte had: be configured to a plurality of pixel electrodes of rectangular in fact; Many the gate lines that dispose of going along a plurality of pixel electrodes; Many source electrode lines along the configuration of the row of a plurality of pixel electrodes; Near and a plurality of on-off elements in friendship justice position that are configured in many gate lines and many source electrode lines.Many gate lines are connected to the gate drivers that drives these gate lines, many source electrode lines are connected to the source electrode driver that drives these source electrode lines, gate drivers and source electrode driver are controlled by control circuit.Each on-off element is made of for example thin film transistor (TFT) (TFT), and with regard to conducting, the pixel voltage that is set on the corresponding source electrode line by source electrode driver just is applied on the respective pixel electrode during by gate driver drive correspondence gate line.In the subtend substrate, set common electrode and make facing to a plurality of pixel electrodes that are configured on the array base palte.A pair of pixel electrode and common electrode with a part that is positioned at these interelectrode liquid crystal layers, be that pixel region constitutes liquid crystal pixel.The driving voltage of pixel be applied on the pixel electrode pixel voltage be applied to the poor of common voltage on the common electrode, become at on-off element and also remain between pixel electrode and the common electrode after non-conduction.Utilize the electric field of this driving voltage correspondence to set the interior Liquid Crystal Molecules Alignment of pixel region, the transmitance of control pixel.The reversal of poles of driving voltage by with the common voltage be benchmark to make pixel voltage be that periodically antipolarity is realized, direction of an electric field is reversed stop the ubiquity phenomenon of liquid crystal molecule in the liquid crystal layer.
In mobile product, can work over a long time for making as the battery of power supply, be necessary to reduce backlight and power consumption driving circuit.In addition, as with the slow liquid crystal goods of TN liquid crystal the sort of response speed the time, because of dynamic image seems fuzzy, so can not obtain good watching property of dynamic image.Therefore, except that reducing power consumption, also require the raising of display quality.
In the field of large-scale LCD TV etc., adopting to have the LCD panel that dynamic image shows OCB (bending of the optical compensation) pattern of necessary high speed liquid crystal response.The state of orientation that this LCD panel makes liquid crystal molecule is transferred to curved orientation in advance and is carried out display action from spraying orientation in advance, but this curved orientation state is not through for a long time in the making alive state, or the state that approaches this state will reverse to move on to and spray orientation when continuing.In this LCD panel,, adopt black the insertion to drive (opening the 2002-202491 communique) with reference to the spy for preventing to the countertransference of spraying orientation.At this moment, drive LCD panel, make to carry out vision signal about 80% in image duration for example to show, about 20% carry out the black demonstration that driving voltage is a maximum (demonstration of non-video signal) with all the other of a frame.In addition, this black insertion drives, because the briliancy response that dynamic image is made the impulse type that approaches CRT in showing with simulating is clear for the retina image retention that observer's vision is produced, sees the motion of object smoothly, is effective.Therefore, the black insertion drives as the technology that improves watching property of dynamic image by leaps and bounds and prominent.
Insert in the display board that drives black, for example, each pixel electrode is applied writing of pixel voltage, in an image duration, carry out 2 times, write as deceiving to insert to write with vision signal.Figure 15 illustrates and uses driving grid line Y1 successively to deceiving to insert to write with writing with vision signal, Y2, and Y3 ... the moment.Drive in the example this black insertion, as black insertion scanning, gate drivers utilizes the first half of 1 horizontal scan period (1H) of vision signal, driving grid line Y1 successively, Y2, Y3 ... and write scanning as signal, utilize the latter half of 1 horizontal scan period (1H) of vision signal, driving grid line Y1 successively, Y2, Y3 ...Source electrode driver is at the first half of 1 horizontal scan period (1H), drive whole source electrode lines, the black pixel voltage Vs that inserts is write in the pixel of 1 row for example, and at the latter half of 1 horizontal scan period (1H), drive whole source electrode lines, the pixel voltage Vs of vision signal is write respectively in the pixel of other 1 row.At this moment, during the black insertion of each pixel, equal from black insert be scanned up to signal scanning during.
Here, the power consumption of source electrode driver is investigated.Figure 16 represents not carry out deceiving scanning patter and the source electrode line potential waveform that obtains in the driving always of inserting, and Figure 17 represents to deceive scanning patter and the source electrode line potential waveform that obtains in the driving always of inserting.The longitudinal axis of scanning patter is represented the vertical scanning position of driven gate line correspondence in the LCD panel, and transverse axis is represented the scanning time constantly as the vertical scanning position.
Among Figure 16, for example will put counter-rotating (or row counter-rotating) and drive when being used for LCD panel, setting source electrode line is the current potential of the pixel voltage correspondence of per 1 horizontal scan period (1H) reversal of poles.Because source electrode driver is benchmark with the common voltage with the antipolarity source electrode line that charges in per 1 horizontal scan period, so very big at the power consumption of time shaft upper integral charging current.Therefore, change to row counter-rotatings (or frame counter-rotating) when driving when a counter-rotating (or row counter-rotating) is driven, source electrode driver just per 1 image duration with the antipolarity source electrode line that charges.Be longer than 1 horizontal scan period 1 image duration significantly, therefore, compare significantly and reduced in the power consumption and the some counter-rotating (or row counter-rotating) of time shaft upper integral charging current.
On the other hand, among Figure 17, when deceive insertion in a counter-rotating (or row counter-rotating) drives, source electrode driver is identical with above-mentioned situation, in per 1 horizontal scan period with the antipolarity source electrode line that charges.Because of per 1 horizontal scan period is that pixel voltage is set on benchmark antipolarity ground with the common voltage, so very big at the power consumption of time shaft upper integral charging current.In addition, when in row counter-rotatings (or frame counter-rotating) drive, deceiving insertion, though at the per 1 image duration antipolarity ground setting pixel voltage significantly longer than 1 horizontal scan period, but particularly write in the scanning overlapping period at black insertion scanning and signal, along with being the voltage reversal of benchmark with the common voltage in per 1/2 horizontal scan period, pixel voltage moves between black level and video level, therefore, in row counter-rotating (or frame counter-rotating) drives, be reduced in the power consumption of time shaft upper integral charging current can not be when not deceiving insertion significantly.
From above investigation as can be known, import black the insertion when driving in order to improve watching property of dynamic image, to the power consumption restriction the importing of slow goods such as large-scale LCD TV be easy, but be difficult to the importing of the severe portable goods of power consumption restriction.
Summary of the invention
The present invention does in view of the above-mentioned problems, and its purpose is to provide the liquid crystal indicator that can keep few power consumption and improve display quality.
According to liquid crystal indicator provided by the invention, possess: be configured to a plurality of liquid crystal pixels of rectangular in fact; As pixel voltage, periodically write the drive circuit of each pixel of a plurality of liquid crystal pixels with non-video signal and vision signal; And control circuit, this control circuit be used for setting during the 1st and with different length during the 1st the 2nd during, make the time span that adds up to be no more than for 1 image duration, and Control Driver circuit, carry out in making during the 1st the writing of the non-video signal of described a plurality of liquid crystal pixels, carry out writing in during the 2nd the vision signal of described a plurality of liquid crystal pixels.
In this liquid crystal indicator, do not write the repetition of the overlapping reversal of poles that causes that writes with vision signal because of the non-video signal, can reduce power consumption.And, also may show the ratio optimization that vision signal is shown for making the non-video signal, adjust during the 1st mutually and the length during the 2nd.Thereby, can keep few power consumption, and improve display quality.
Description of drawings
Fig. 1 roughly illustrates the circuit diagram of the liquid crystal indicator of the 1st example of the present invention;
Fig. 2 is the figure of explanation liquid crystal indicator action shown in Figure 1;
Fig. 3 is the figure of the liquid crystal indicator action of explanation the 2nd example of the present invention;
Fig. 4 is the figure of the liquid crystal indicator action of explanation the 3rd example of the present invention;
Fig. 5 is the figure that produces the reason of horizontal stripe when liquid crystal response is slow in the explanation action shown in Figure 4;
Fig. 6 illustrates a plurality of pixel electrodes of the liquid crystal indicator that is applicable to the 4th example of the present invention and the annexation figure of many gate lines;
Fig. 7 illustrates scanning patter and the source electrode line potential waveform figure that obtains in the action of liquid crystal indicator of the 5th example of the present invention;
Fig. 8 illustrates the figure as a result that all detected personnel of statistics obtain the relevant answer of the flicker number under raising frame frequency state in the 1st and the 2nd example;
Fig. 9 illustrates the driving timing figure of the liquid crystal indicator of the 6th example of the present invention;
Figure 10 for explanation the shown in Figure 9 the 1st during with the 2nd during lap in hocket with 1 horizontal cycle unit and blackly to insert scanning and signal writes scanning with scheming;
Figure 11 is as Fig. 9 and implements the block diagram of time-controlled liquid crystal indicator as shown in Figure 10;
The signal that Figure 12 is produced by the 1st and the 2nd frame memory shown in Figure 11 for explanation passes on form with scheming;
Figure 13 is illustrated in black insertion scanning and signal writes the repeatedly driven illustration of each gate line shown in Figure 11 in the scanning;
Figure 14 is illustrated in the repeatedly driven illustration of each gate line shown in Figure 11 in the interval with several horizontal cycle scopes;
Figure 15 illustrate to black insert write with and vision signal write the timing diagram that usefulness drives many gate lines successively;
Figure 16 illustrates and does not carry out the scanning patter that obtains in the black driving always of inserting and the oscillogram of source electrode line current potential;
Figure 17 is illustrated in the scanning patter that obtains in the driving always of deceiving when inserting and the oscillogram of source electrode line current potential.
Embodiment
Example 1
Below, with reference to the liquid crystal indicator of description of drawings the 1st example of the present invention.The circuit that Fig. 1 roughly illustrates this liquid crystal indicator constitutes.The liquid crystal display harness is equipped with: the LCD panel DP of ocb mode; The BL backlight of illumination display board DP; And the display control unit CNT of control display board DP and BL backlight.LCD panel DP is to be the structure of clamping liquid crystal layer 3 between array base palte 1 and the subtend substrate 2 at the pair of electrodes substrate.Liquid crystal layer 3 for example contains transfers to the liquid crystal of curved orientation as liquid crystal material from spraying orientation in advance for normal white display action., stoped to the countertransference of spraying orientation from curved orientation by will periodically being applied on the liquid crystal layer 3 corresponding to the black driving voltage that shows.
Subtend substrate 2 comprises: be configured in chromatic color filter that the dyed layer of the red, green, blue on the transparent insulation substrate of glass substrate for example etc. constitutes and be configured in common electrode CE on the chromatic color filter with a plurality of pixel electrode PE subtends.Each pixel electrode PE and common electrode CE are made of the transparent electrode material of for example ITO etc. in light transmission escope situation, use the alignment films of friction treatment to cover parallel to each other respectively, with being pixel region, constitute OCB liquid crystal pixel PX corresponding to a part from the liquid crystal layer 3 of the Liquid Crystal Molecules Alignment control of the electric field of pixel electrode PE and common electrode CE.
A plurality of OCB liquid crystal pixel PX have by pixel electrode PE; Common electrode CE; And and be clamped in the liquid crystal capacitance CLC that the liquid crystal layer 3 between pixel electrode PE and the common electrode CE constitutes.Many auxiliary capacitance line C1～Cm and the pixel electrode PE capacitive coupling of the liquid crystal pixel PX of corresponding row separately constitute auxiliary capacitor Cs.
Display control unit CNT is to a plurality of on-off element W of row unit conducting, further possesses control circuit 5, this control circuit 5 control gate driver YD; Source electrode driver; And and the LD of backlight drive portion (transducer), wherein gate drivers YD drives many gate line Y1～Ym successively; Source electrode driver XD in conduction period, respectively outputs to many source electrode line X1～Xns with pixel voltage Vs by the driving of corresponding gate line Y at the on-off element W of each row; The LD of backlight drive portion drives BL backlight.
Constitute control circuit 5, make to change that bigger driving voltage is applied to liquid crystal layer 3, make liquid crystal molecule transfer to the initialization process of curved orientation from spraying orientation by common voltage com when power connection.Control circuit 5 according to the synchronizing signal of outside source SS input, outputs to gate drivers YD with the control signal CTY that takes place, according to the synchronizing signal of outside source SS input, with the control signal CTX that takes place; And will output to source electrode driver XD with the non-video signal, and, export the common voltage Vcom that is applied to counter electrode CE to the common electrode CE of subtend substrate CT from the vision signal or black insertion of outside source SS input.In control circuit,, in 1 image duration, set during the 1st according to the synchronizing signal of outside source SS input; And with the 1st during length different, not with the 1st during repeat the 2nd during.Be used for during the 1st a plurality of liquid crystal pixel PX input non-video signals are inserted as black, be used for to a plurality of liquid crystal pixel PX incoming video signals during the 2nd.During the 1st and the 2nd during total ascent time length equaled for 1 image duration.
Gate drivers YD utilizes the control of control signal CTY, drive many gate line Y1～Ym in during the 1st successively, make the row of selecting a plurality of liquid crystal pixel PX successively as black insertion scanning, in during following the 2nd during the 1st, drive many gate line Y1～Ym successively, make and select the row of a plurality of liquid crystal pixel PX to write scanning successively as vision signal.On the other hand, the non-video signal of output 1 row was as the pixel voltage Vs of black level during source electrode driver XD each line by gate line Y1～Ym in during the 1st was driven, and the vision signal of output 1 row drove many source electrode line X1～Xn side by side as the pixel voltage Vs of video level during each line of gate line Y1～Ym was driven in during the 2nd.Through respective pixel on-off element W, the pixel voltage Vs of 1 row is applied to the liquid crystal pixel PX of selection row.Here, to the pixel voltage Vs of all liquid crystal pixel PX, all pixel columns are set to identical polar in frame inversion driving situation.Being the influence that prevents to glimmer, in row inversion driving situation, is that benchmark is set at antipolarity with the common voltage to every pixel column.In addition, to the pixel voltage Vs of all liquid crystal pixel PX, for preventing the deterioration of liquid crystal material, to being per image duration that benchmark makes reversal of poles with the common voltage.
Liquid is in this crystal device, control by control circuit 5 generations, utilize the first half of each horizontal scan period to carry out successively the black insertion of all liquid crystal pixel PX is write, simultaneously, utilize the latter half of each horizontal scan period to carry out successively the vision signal of all liquid crystal pixel PX is write, make with control gate driver YD and source electrode driver XD and alternately repeat black to insert that to write the mode always that writes with vision signal different.That is to say that control circuit 5 utilizes and carries out successively during the 1st the black insertion of all liquid crystal pixel PX is write as shown in Figure 2, utilization is carried out the vision signal of all liquid crystal pixel PX is write during following the 2nd during the 1st successively.That is, control gate driver YD and source electrode driver XD make alternately not repeat to deceive to insert to write with vision signal and write.At this moment, as shown in Figure 2, the source electrode line current potential does not change black the insertion in the scanning at least.Among Fig. 2, the source electrode line current potential that draws writes in the scanning at signal and does not also change, but exists with ... the pixel voltage level of the different vision signal of each pixel.And, writing in the scanning at this signal, the source electrode line current potential does not change with reversal of poles yet.Therefore, can get both by the raising of deceiving the watching property of dynamic image of inserting the driving generation and the reduction of power consumption.
In addition, make during the 1st and the 2nd during total ascent time length to be no more than for 1 image duration be necessary, but as black insertion rate, the time span during the 1st can change arbitrarily the ratio of the time span of 1 image duration.Also can set make distribute respectively during the 1st and the 2nd during be the preceding half-sum latter half of 1 image duration.At this moment black insertion rate is 50%.In addition, owing to constitute control circuit 5, make by self determining during the 1st and the length during the 2nd that so write under the situation that scanning equaled for 1/4 image duration separately at black scanning and the signal of inserting, deceiving the insertion rate can be suitably variable in 25% to 75% scope.Though black insertion scanning can allow it have nothing in common with each other with the scan period that signal writes scanning, the circuit formation goes up hope makes it identical.In addition, for increasing the variable amplitude of black insertion rate, wishing that black insertion scanning is short with the scan period that signal writes scanning, is below 1/4 image duration.
For preventing countertransference effectively, the temperature variation that also can be used in combination environment changes black insertion rate, also might as well combining environmental illumination be changed.
Among Fig. 2, setting during the 1st is about 1/4 (25%) the length of 1 image duration, and setting during the 2nd is all the other length of about 3/4 (75%) of 1 image duration.Black insertion scanning is identical with the sweep velocity that signal writes scanning, black insert scanning and during the 1st, finish in (1/4 image duration), signal write about scanning initial 1/3 in during connecting the 2nd during the 1st (1 image duration 1/4 i.e. 1/4 image duration) during in finish.In in during the 2nd all the other 2/3 (be 2/4 image duration 2/4 of 1 image duration), the pixel voltage Vs of video level is held in each liquid crystal pixel PX relaying continuation of insurance.By the way, though writing scanning, signal begins after during being right after the 1st, but utilize the black black level pixel voltage Vs that scanning is written to each row liquid crystal pixel PX that inserts, be held until utilize signal write scanning the pixel voltage Vs of video level is write corresponding row liquid crystal pixel PX during.In addition, though black next time insertion begins after scanning during being right after the 2nd, but utilize signal to write the pixel voltage Vs that scanning is written to the video level of each row liquid crystal pixel PX, be held until utilize black insert liquid crystal pixel PX that scanning writes black level pixel voltage Vs corresponding row during.
The relation of (=a 75%) example only during (=25%) and the 2nd during the above-mentioned the 1st, by during making the 1st than shorter during the 2nd, can obtain higher light utilization ratio.
In addition, for make black insert scanning and signal write scanning each comfortable 1 image duration about 1/4 (25%) during finish, being necessary to make sweep velocity is always 4 times.Therefore,,, can not reduce the bore rate by for example using polysilicon (p-Si) thin film transistor (TFT) etc. as pixel switch element W, and can corresponding sweep velocity write fast.In addition, owing to take into account sweep velocity, compare the easier LCD panel that is applicable to the exploring degree (number of scanning lines is below 500) that uses in the portable goods with the LCD panel that is applicable to high-resolution.
In above-mentioned example, though any all applicable in row inversion driving and the frame inversion driving, from the viewpoint of power consumption, the frame inversion driving is comparatively favourable.
What the frame inversion driving was favourable the reasons are as follows.
1) generally a counter-rotating with or the source electrode driver of row counter-rotating usefulness in, the power consumption (static power) that discharges and recharges beyond the necessary electric power of source electrode line load is greater than the source electrode driver of row counter-rotating or frame counter-rotating usefulness.
2) in the frame counter-rotating, each image duration, the polarity to the pixel voltage of all pixel columns was identical.In addition,, can reduce driver and move necessary voltage amplitude, reduce the power consumption of source electrode driver by the common counter-rotating that common voltage Vcom is changed to pixel voltage Vs combination.
Only doing frame when counter-rotating,, can solve by adjusting frame frequency etc. though bad flicker is often remarkable from the display quality aspect.Again, in the moment of frame counter-rotating, not necessarily per image duration is all necessary, because of the relation with flicker also might as well be every several image duration.
In addition, compromise as a counter-rotating (or row counter-rotating) and row counter-rotatings (or frame counter-rotating), also can adopt every k pixel column (k=2,3,4,5,6 ...) make the type of drive of reversal of poles.This type of drive reduces effect though can not expect the power consumption as pure row counter-rotatings (or frame counter-rotating), has the advantage that can reduce flicker.But the pixel column after being right after reversal of poles is different because of write diagnostics and other pixel columns of pixel voltage, occurs the worry of horizontal stripe in display frame.For this reason, wish to adjust the pixel voltage that is right after reversal of poles pixel column afterwards.
In this example, do not have because of writing and, therefore can reduce power consumption the non-video signal (the pixel voltage Vs of black level) of all pixel PX to the repetition of the reversal of poles of the overlapping generation between the writing of the vision signal (the pixel voltage Vs of video level) of all pixel PX.In addition, show the ratio optimization that vision signal is shown, also can adjust during the 1st mutually and the length during the 2nd in order to make the non-video signal.Thereby, can keep few power consumption, and improve display quality.
Example 2
Below, the liquid crystal indicator of the 2nd example of the present invention is described.This liquid crystal indicator constitutes identical with the 1st example except that following item.Fig. 3 illustrates scanning patter and the source electrode line potential waveform that obtains in the action of this liquid crystal indicator.In the following description, represent and Fig. 1 identical construction part with identical label, and omit detailed explanation.
In this liquid crystal indicator, control circuit 5 is synchronized with the action of LCD panel DP side, and the control backlight drive LD of portion makes to light and extinguishes BL backlight.Specifically, setting during the 1st is about 1/4 (25%) the length of 1 image duration, and setting during the 2nd is all the other length of about 3/4 (75%) of 1 image duration.Black then insertion scanning is carried out with gathering, in 1/4 image duration non-video signal (the pixel voltage Vs of black level) is applied on all liquid crystal pixel PX.Carry out signal during about 1/3 initial (be 1/4 image duration 1/4 of 1 image duration) during connecting the 2nd during the 1st and write scanning, apply each self-corresponding vision signal with liquid crystal pixel PX.The pixel voltage Vs of video level is held in each liquid crystal pixel PX relaying continuation of insurance in all the other 2/3 (were 2/4 image duration 2/4 of 1 image duration) in then during the 2nd.Then, light BL backlight i.e. 2/4 image duration during the pixel voltage Vs that keeps video level corresponding to all liquid crystal pixel PX, during in addition promptly black insert scanning and signal write scanning during, extinguish BL backlight.
Such control has following advantage.
1) because of lighting BL backlight after the pixel voltage Vs that keeps video level at all liquid crystal pixel PX, so can improve the light utilization ratio of BL backlight.Temporal smooth utilization ratio is 75% in action shown in Figure 2, is essentially 100% in action shown in Figure 3.
2) action shown in Figure 3 only makes 50% picture of 1 image duration that BL backlight extinguishes show that for black all the other 50% pictures that only made for 1 image duration are that vision signal shows.At this moment briliancy distributes, and like that only 25% picture of 1 image duration is for deceiving demonstration than action shown in Figure 2, and remaining 75% picture is the situation that vision signal shows, more approaches impulse type, can improve watching property of dynamic image.This watching property of dynamic image represents as index that with MPRT (dynamic image response time) this MPGT has reduced.
3) during the lighting of BL backlight, write scanning,, therefore can be defined as certain value in advance so needn't make the source electrode line potential change because of not carrying out signal.Thereby,, also take place hardly because of vertical cross (talk), briliancy that the capacitive coupling between source electrode line X and pixel electrode PE or the cut-off leakage current in the thin film transistor (TFT) cause such problem that tilts even if when row counter-rotatings or frame inversion driving.
4) because of BL backlight black insert scanning and signal write scanning during in extinguish, so there is no need to require black insertion to scan that to write the sweep velocity of scanning identical with signal.Therefore, might deceive all liquid crystal pixel PX as shown in Figure 3 with gathering and insert scanning, relative with it, for the pixel voltage Vs that writes video level guarantees the sufficient time, carry out signal and write scanning.So, improved the write diagnostics of the pixel voltage Vs of video level.By the way, in the action shown in Figure 2, because BL backlight is in illuminating state often, black when inserting scanning and signal and writing scanning and do not carry out with identical speed, signal in image duration is different with the place in the picture during showing, exist to be observed the worry that briliancy tilts, but do not have such problem in this example.
According to this example, the scan period that desirable signal writes scanning was 1/4 image duration, and therefore, black insertion rate can suitably change in 25% to 75% scope.And for effectively preventing countertransference, the temperature variation that also can be used in combination environment changes black insertion rate, also might as well combining environmental illumination be changed.
Example 3
Below, the liquid crystal indicator of the 3rd example of the present invention is described.This liquid crystal indicator constitutes identical with the 1st and the 2nd example except that following item.Fig. 4 illustrates scanning patter and the source electrode line potential waveform that obtains in the action of this liquid crystal indicator.In the following description, represent and Fig. 1 identical construction part with identical label, and omit detailed explanation.
In this liquid crystal indicator, control circuit 5 is identical with the 2nd example, is synchronized with the action of LCD panel DP side, and the control backlight drive LD of portion makes to light and extinguishes BL backlight.That is, keep corresponding to all liquid crystal pixel PX video level pixel voltage Vs state during i.e. 2/4 image duration, BL backlight is lighted, during in addition promptly black insert scanning and signal write scanning during extinguish BL backlight.Control circuit 5 further control gate driver YD and source electrode driver XD make the behavior the 1st of dividing a plurality of liquid crystal pixel PX at least and the 2nd group, repeat blackly to insert scanning and signal writes scanning corresponding to these groups.Here, dividing a plurality of liquid crystal pixel PX is by 1,3,5,7 ... the odd-numbered line group that the liquid crystal pixel PX of row constitutes with by 2,4,6,8 ... the even number line group that the liquid crystal pixel PX of row constitutes, black scanning and the signal of inserting writes scanning and divides separately and carry out for 2 times.
Utilize this control, gate drivers YD inserts scanning as odd-numbered line is black for the odd-numbered line of selecting a plurality of liquid crystal pixel PX in during the 1st, drive the gate line Y1 of odd number in batch, Y3, Y5, and, drive the gate line Y2 of even number in batch, Y4 for the even number line of selecting a plurality of liquid crystal pixel PX scans as black insertion of even number line, Y6 ...Source electrode driver XD is scanning driving grid line Y1 in batch by black insertion of odd-numbered line, Y3, Y5, during this time, the non-video signal of output 1 row is scanning driving grid line Y2 in batch as black level pixel voltage Vs by black insertion of even number line, Y4, Y6 ... during this time, the non-video signal of output 1 row is as making and black level pixel voltage Vs to the pixel voltage Vs antipolarity of the black level of the liquid crystal pixel PX of odd-numbered line.
In addition, gate drivers YD during connecting the 2nd during the 1st in for to select the odd-numbered line of a plurality of liquid crystal pixel PX to write scanning successively as odd line signal, drive odd number gate line Y1 successively, Y3, Y5, and, drive the gate line Y2 of even number successively, Y4 for to select the even number line of a plurality of liquid crystal pixel PX to write scanning successively as even line signal, Y6 ...Source electrode driver XD is being write each gate line Y1 of turntable driving by odd line signal, Y3, Y5, during this time, the vision signal of output 1 row is being write each gate line Y2 of turntable driving as the pixel voltage Vs of video level by even line signal, Y4, Y6 ... during this time, the vision signal of output 1 row is as making and video level pixel voltage Vs to the pixel voltage Vs antipolarity of the video level of the liquid crystal pixel PX of odd-numbered line.
In such action, do not make the change in polarity this point of source electrode line current potential be similar to the form of row counter-rotating or frame inversion driving with per 1 horizontal scan period (1H), the carrying out point of simulation or row counter-rotating are possible.
Therefore, in this example, can reduce the power consumption that discharges and recharges that is accompanied by source electrode line X, suppress flicker simultaneously.The frame inversion driving is more favourable than row inversion driving aspect the power consumption reduction in the explanation of the 1st example, but also mentions the influence that is subject to glimmer.Relative therewith, as this example, except extinguishing with lighting of the same BL backlight of the 2nd example, insert scanning and signal writes the mode that scanning is divided into 2 times respectively by adopting to deceive, can obtain showing the significant flicker inhibition effect that produces by the row counter-rotating of simulation.
Again, be not limited to the capable grouping of above-mentioned odd and even number, also the row of a plurality of liquid crystal pixel PX can be divided into by 1,25,6 with 2 row units, 9,10 ... the 1st group of constituting of the liquid crystal pixel PX of row and by 3,4,7,8,11,12 ... the 2nd group of constituting of the liquid crystal pixel PX of row carries out 2 scanning.In addition, also can be divided into by 1,4,7 ... the 1st group of constituting of the liquid crystal pixel PX of row, by 2,5,8 ... the 2nd group of constituting of the liquid crystal pixel PX of row, by 3,6,9 ... the 3rd group of constituting of the liquid crystal pixel PX of row carries out 3 scanning.
,, the 3rd example reduces the advantage that suppresses with flicker, because of horizontal stripe takes place when slack-off liquid crystal responses such as utmost point low temperature easily though having power consumption concurrently.This horizontal stripe betides situation shown in Figure 5.When for example noticing the liquid crystal pixel PX of the 1st row (odd-numbered line) and per 2 row (even number line), be offset odd line signal the zero hour with respect to writing of these pixels PX and write the mistiming that scanning and even line signal write scanning.Here, when the low-response of liquid crystal, the migration of pixel transmitance produces transmitance difference not in the preceding end of lighting of BL backlight between the pixel PX of odd-numbered line and the pixel PX of even number line, and the luminance difference that this difference produces just is observed as horizontal stripe.For not making this luminance difference conspicuous, consider to make BL backlight light constantly than moment of been scanned a little later.Yet the brightness owing to all pictures at this moment reduces, so wish the briliancy of raising BL backlight in advance.
Example 4
Below, the liquid crystal indicator of the 4th example of the present invention is described.This liquid crystal indicator constitutes identical with the 1st example except that following item.Fig. 6 illustrates suitable a plurality of pixel electrode PE of this liquid crystal indicator and the annexation of a plurality of gate line Y.In the following description, represent and Fig. 1 identical construction part with identical label, and omit detailed explanation.
In this liquid crystal indicator, control circuit 5 is identical with the situation of the 3rd example, be synchronized with the action of LCD panel DP side, the control backlight drive LD of portion makes to light and extinguishes BL backlight, further control gate driver YD and source electrode driver XD, make the behavior the 1st of dividing a plurality of liquid crystal pixel PX at least and the 2nd group, repeat blackly to insert scanning and signal writes scanning corresponding to these groups.Different with the 3rd example, the gate line Y of grid link that becomes the on-off element W that pixel electrode PE uses is opposite up and down at the adjacent column chien shih.When this formation, will be divided into odd-numbered line group and even number line group carry out staggered scanning merge be used for pixel voltage Vs polarity in the situation of all row for identical frame inversion driving, before scanning respectively, in the half-sum latter half, separately drive the pixel PX of odd-numbered line and the pixel PX of even number line up and down.In other words, even hypothesis exists because of liquid crystal response causes luminance difference slowly, also become the light and shade briliancy figure that is difficult for conspicuous criss-cross, so can improve display quality because of comparing with horizontal stripe shape.
This mode approaches to realize simultaneously that to the static power of source electrode driver XD with along with the driving of the most favourable frame counter-rotating of the power consumption of the charging of source electrode line X the point counter-rotating that can suppress to glimmer shows, is extremely excellent mode therefore.Here, be not limited to each pixel electrode PE, 2 positions of itemizing, position or 3 of itemizing of for example also can reversing to the grid link of on-off element W counter-rotating 1 position of itemizing.
Example 5
Below, the liquid crystal indicator of the 5th example of the present invention is described.This liquid crystal indicator constitutes identical with the 1st and the 2nd example except that following item.Fig. 7 illustrates scanning patter and the source electrode line potential waveform that obtains in the action of this liquid crystal indicator.Identical with Fig. 2 and action shown in Figure 3, during the 1st and in during the 2nd all liquid crystal pixel PX deceive to insert respectively and scan and signal writes scanning.
In this liquid crystal indicator, carry out 2 signals in especially during the 2nd and write scanning, write the signal that writes in the scanning with the 1st time at the 2nd time signal and write the identical signal of scanning.Source electrode driver XD carries out the output action of the vision signals that repetition connects for 2 times to the liquid crystal pixel PX of the row of gate line Y1～Ym correspondence, and the vision signal of gate drivers YD and source electrode driver XD is exported the scanning motion that synchronously carries out 2 gate line Y1～Ym of repetition.Among Fig. 7, the row of all liquid crystal pixel PX is deceived insertion scanning in batch, but also can the row of all liquid crystal pixel PX be carried out successively.
By adopting the mode of this example, can make the time for writing signal of each row be essentially 2 times, can prevent to write the harmful effect (for example decline of briliancy) that deficiency causes because of signal.Illustrated in this explanation that it may be difficult being applied to the 1st example of the present invention in the LCD panel of high-resolution, but the 5th example of the present invention very may be applied to the LCD panel of high-resolution.
Again, it must not be 2 times that signal writes scanning, repeat 3 times, and 4 times ..., also have no relations.Carry out the 2nd scanning in during the lighting of BL backlight among Fig. 7, but also can after the 2nd scanning is finished, begin lighting of BL backlight in addition.Relevant sort signal writes the number of times of scanning or lighting constantly of BL backlight, as long as adopting suitable condition just can aspect the burden of considering source drive YD or the necessary briliancy etc.
Again, about above-mentioned the 1st～the 5th example, especially when making the frame inversion driving, the polarity of pixel voltage Vs on the pixel electrode PE that applies with respect to source electrode line X, common voltage Vcom on the common electrode CE is changed with phase reversal, because of thereby the necessary voltage amplitude of the drive actions that can reduce source electrode driver XD reduces power consumption, therefore better.
Again, about the flicker of worrying in the 1st and the 2nd example, also can by improve frame frequency from general 60Hz to 90Hz or 120Hz reduce.But the sweep velocity that at this moment 6～8 times of high speeds of sweep velocity used in the driver always must be arranged.
In the reality, as object, implemented the subjective assessment of relevant flicker with 30 people's the person of being verified.These persons of being verified are viewed as the LCD panel DP of display image with the 1st and the 2nd example of the state-driven that raises from general 60Hz, and whether subjective determination finds flicker.Attach and say that having used diagonal line as LCD panel is 4.3 inches, pixel count is 480 * 272 plate.As type of drive, illustrated above and wished row counter-rotating or frame counter-rotating, selected the frame inversion mode for paying attention to power consumption here.Display image adopts the easiest medium tone grating demonstration of finding out flicker in addition.Fig. 8 illustrates from being verified the statistics of the answer that personnel obtain.Frame frequency is 70Hz when following, no matter is the LCD panel to the 1st and the 2nd example, all has the person of being verified who finds flicker.In contrast, be 75Hz when above at frame frequency, there is not the person of being verified who finds flicker.According to this statistics, judge when carrying out the frame inversion driving with the 1st and the 2nd example, wish that frame frequency is more than the 75Hz.
In addition, in the 1st～the 5th example, also because of the slow upper end row of picture and the transmitance response difference of lower end row of causing of liquid crystal response as shown in Figure 5, tilt sometimes thereby produce briliancy.Can be by per 1 image duration of counter-rotating being selected the vertical scanning direction of the row of a plurality of pixel PX, for example in odd-numbered frame from the upper end line scanning to the lower end row, the mode in even frame from the lower end line scanning to the upper end row suppresses this briliancy and tilts.
Subsidiary saying, the present invention also has the LCD panel of utilizing ocb mode can prevent that liquid crystal is from the effect of curved orientation to the countertransference of spraying orientation.
Again, for the liquid crystal mode beyond the OCB, as TN (twisted-nematic) pattern, IPS (plane internal switch) pattern, VA (homeotropic alignment) pattern even use the driving of the 1st～the 4th example, also can not get such superior the watching property of dynamic image of ocb mode.For example during the driving of Fig. 2, write the back liquid crystal aligning and shift and be stabilized to black state (promptly resetting to the liquid crystal aligning state) immediately deceiving to insert among the OCB, but in other patterns, low-response because of liquid crystal, even having arrived next signal writes and does not yet reach steady state (SS) the zero hour, just the former state signal of the liquid crystal aligning state of frame writes before spinning out, and prior image frame stays as image retention.In addition, strong dielectricity liquid crystal or anti-strong dielectricity liquid crystal have speed-sensitive switch, but because of having 2 value switches
Characteristic is so exist GTG to show the problem of difficulty.Therefore, in the 1st～the 5th example of the present invention, by using according to the big or small GTG that applies voltage to show it is possible, and response speed is fast, for example response speed (response+decline of rising) is below the 10msec, more preferably following liquid crystal such as the OCB liquid crystal of 8msec be we can say the effect that performance is maximum.Again, the OCB liquid crystal that this example is used, setting response speed (response+decline of rising) is 7msec, obtains effect of sufficient.
Again, used BL backlight in the 2nd～the 5th example, wish the such residual light of CCFL (cold cathode type fluorescent lamp) of backlight or short residual smooth type with LCD few (promptly from close to the switching of opening or from the switching of reaching the pass rising, the decline of briliancy precipitous) device.In addition, wish to possess when carrying out the driving of the 1st～the 5th example liquid crystal indicator and store the storer (frame memory) that the vision signal of 1 frame is used.This frame memory can be packed among the source electrode driver XD, among the control circuit 5 of also can packing into.
Example 6
Below, the liquid crystal indicator of the 6th example of the present invention is described.
Fig. 9 illustrates the driving timing in this liquid crystal indicator.This example is characterised in that (1) is different with the 1st～the 4th example before this, and be the zero hour that signal writes scanning (signal write during+during keeping) partly overlapping and (2) zero hour of controlling during the 2nd according to temperature during the 1st during (during black the insertion) and the 2nd.
As shown in Figure 10, during the 1st with the 2nd during lap in, hocket with 1 horizontal cycle unit and blackly to insert scanning and write scanning with signal.
The consideration method of the timing setting in the manner is as follows.
At first, write 1 pixel, determine the sufficient basic horizontal cycle (among Figure 10 with during the writing shown in the TH in order to deceive non-video signal or the vision signal of inserting usefulness.Concerning black insert to write to use to write with vision signal there is no need to be equal length during this period using, be taken as identical here for the sake of simplicity).Calculate then for black insert write or vision signal to write from top to bottom (or from bottom to up) scanning desired time of picture be 2 * TH * number of scanning lines.Among Fig. 9, be shown be i.e. 36% o'clock the example below 50% of 1 frame the sweep time of so trying to achieve.
Secondly, black insertion scanning is as follows with the relative time relation decision that signal writes scanning.Now, when being fixed in the front end of image duration as shown in Figure 9 the zero hour that will deceive insertion scanning, can change relative time relationship the zero hour that writes scanning by the change signal.Insert scanning (being the front end of image duration) to signal to write the time (supposing that it is TB) that scanning begins short more from black, can guarantee that the retention time is long more, briliancy is big more, but ought be too hour, can cause the countertransference of OCB liquid crystal.Therefore, setting TB in the scope of moving that do not take a turn for the worse is as far as possible little value.Countertransference generally at high temperature takes place easily, is difficult at low temperatures taking place, and therefore, according to temperature, TB establishes more greatly in high temperature, and TB establishes forr a short time in low temperature.Among Fig. 9, illustrating as the condition that do not take a turn for the worse and move, set at room temperature that (～20 ℃) are 13% of 1 image duration, is 1% the example of 1 image duration in low temperature (20 ℃).
Lighting of BL backlight begins to be located at the moment that signal writes the end of scan, lights the moment that the black insertion that finishes to be located at next frame begins (certainly, strict conformance not necessarily also can have departing from more or less).According to the moment of the bright beginning of temperature control point, be 100%-(36%+13%)=51% in the room temperature during backlight lightening in this example, in the low temperature 100%-(36%+1%)=63%.
Again, also can be as doing in the 5th example of the present invention, as required, during backlight lightening in, carry out the 2nd auxiliary signal and write scanning (writing and the 1st identical vision signal).Utilize the 2nd scanning can prevent to write the harmful effect (descending) that deficiency causes as briliancy because of signal.
Figure 11 is the block diagram of the liquid crystal indicator of time-controlled above-mentioned example of enforcement.The formation of this liquid crystal indicator is the development of formation shown in Figure 1, and its characteristics are that temperature information that control circuit detects according to temperature sensor TS with the said method controlling and driving regularly.Again, though do not specify that in Fig. 1 control circuit 5 is by gate drivers YD; Source electrode driver XD; The timing control part TC of the driving timing of the control backlight drive LD of portion; And the 1st and the 2nd frame memory FM1 that is used for store video information, FM2 constitutes.
Here, with Figure 12 frame memory FM1 is described, the signal of FM2 passes on.Outside source SS passes on vision signal to liquid crystal indicator with time series, and wherein 2 frame signals (note is made frame [n] and [n+1]) are shown.
At first, inside and outside signal source SS exports 1 frame video signal during the frame [n], and frame memory FM1 accepts vision signal in whole this period, the vision signal of whole 1 frames of storage among the last frame memory FM1 during frame [n].And then, i.e. initial at frame [n+1], the vision signal of frame memory FM1 is transferred to frame memory FM2 with gathering.In then during frame [n+1], with moment of the enterprising line scanning of picture synchronously, vision signal is transferred to source electrode driver XD successively from frame memory FM2, and each pixel is write the corresponding picture signal of incoming frame [n].By repeat above action with the frame period, can on picture, postpone 1 frame and show dynamic image.
In the 1st～the 4th example of the present invention, in order to separate black the insertion time that writes scanning with signal of scanning, can not will insert beginning to be set at less than deceive from top to bottom on the picture and inserting the required time of scanning of scanning from black to the time (being equivalent to the TB time Fig. 9) that signal writes the beginning of scanning, but insert scanning and signal to write scanning overlapping because of black in the 6th example, so there is not this restriction, can shortens to according to countertransference and prevent the lower limit determined.So, can win backlight lighting the time, may obtain than the higher briliancy of the 1st～the 4th example.
In addition, if can effectively use OCB in low temperature, to be difficult for the fact that takes a turn for the worse and move, then in low temperature, can more increase the backlight lightening time.In general, the briliancy of low temperature BL backlight is dark more, and response speed of liquid crystal is also slow more, so the briliancy of display image also has the tendency of deepening, but according to the 6th example, the briliancy that may compensate in this low temperature descends, and may also obtain very bright image in low temperature.
In addition, in the 6th example, as shown in figure 10, alternately black insertion scanning writes scanning with signal to each TH, about half when so the speed that the signal from frame memory FM2 to source electrode driver XD passes on can be the 1st～the 4th example, the advantage of the burden with control circuit 5 sides little (can reduce the frequency of operation of control circuit 5, can dwindle circuit scale and reduce power consumption).
Again, in the manner, because of every TH handover source driver output, so some increase of the power consumption that relevant signal wire discharges and recharges.Therefore be suitable for the requirement of power consumption correspondingly not strict and require the driving method in the high briliancy the sort of field of (comprising low temperature especially) (for example vehicle mounted display etc.).
, blackly among Figure 10 insert scanning, signal writes and scans all run-downs, only drives each gate line 1 time, can (black shown in Figure 13 insert scanning, signal writes the situation that scanning all drives 3 times) but repeatedly drive as shown in Figure 13 also.As so then can improve write diagnostics, obtain preventing because of writing the not enough briliancy that the produces the sort of advantage that descends.
In addition, as shown in figure 14, also changeable gate drivers output makes and separate output driving grid impulse in several horizontal cycles (H) scope.Do like this, can obtain because of in succession between 2 times the switching during writing of producing of liquid crystal transition response strengthen effect (liquid crystal molecule produce indicial response to voltage, the dielectric constant that applies direction of an electric field increases, also accumulate more electric charge under the voltage in identical applying, apparent going up improved write diagnostics), even if identical switching times also can obtain the write diagnostics higher than Figure 13.Generally, the increase that is directly proportional with the switching times of grid of grid power consumption, but if the mode of pressing Figure 14 then with the power consumption identical with Figure 13, just obtains higher write diagnostics.
The liquid crystal indicator of each above-mentioned example, though be that example is illustrated with the light transmission type, even also it doesn't matter for the liquid crystal indicator of semi-transmission type.
Claims (19)
1. liquid crystal indicator is characterized in that possessing:
Be configured to a plurality of OCB liquid crystal pixels (PX) of rectangular in fact;
With non-video signal and vision signal as pixel voltage, periodically write each pixel of described a plurality of liquid crystal pixel (PX) drive circuit (YD, XD); And
Control circuit (5), this control circuit (5) be used for setting during the 1st and with different length during the 1st the 2nd during, make the time span that adds up to be no more than for 1 image duration, and Control Driver circuit (YD, XD), carry out in making during the 1st the writing of the non-video signal of described a plurality of liquid crystal pixels (PX), carry out writing in during the 2nd the vision signal of described a plurality of liquid crystal pixels (PX).
2. liquid crystal indicator as claimed in claim 1 is characterized in that,
Constitute described control circuit (5), make described a plurality of liquid crystal pixels (PX) are reversed with row counter-rotating and frame in the reverse polarity of described pixel voltage of at least a mode.
3. liquid crystal indicator as claimed in claim 2 is characterized in that,
Constitute described control circuit (5), make and to set during the described the 2nd during following the described the 1st, and in during the described the 2nd to described a plurality of liquid crystal pixels (PX) all finish the writing of vision signal after, set during the maintenance of described pixel voltage.
4. liquid crystal indicator as claimed in claim 3 is characterized in that,
Described a plurality of liquid crystal pixels (PX) are provided with back light portion, and (BL LD), and constitutes described control circuit (5), makes that (BL lights during the pixel voltage in LD) being controlled to only during the described the 2nd keeps with described back light portion.
5. liquid crystal indicator as claimed in claim 4 is characterized in that,
Constitute described control circuit (5), make enforcement writing with gathering the non-video signal of described a plurality of liquid crystal pixels (PX).
6. liquid crystal indicator as claimed in claim 5 is characterized in that,
Constitute described control circuit (5), make to utilize per at least 2 row units skip the row of a plurality of liquid crystal pixels (PX) and the repetition of the scanning carried out along a direction, implement writing of each described non-video signal and writing of described vision signal.
7. liquid crystal indicator as claimed in claim 6 is characterized in that,
(YD XD) constitutes the row of selecting described a plurality of liquid crystal pixels (PX) through many gate lines (Y), and connects into and utilize gate line opposite up and down between adjacent column (Y) to select described a plurality of liquid crystal pixels (PX) with described drive circuit.
8. liquid crystal indicator as claimed in claim 1 is characterized in that,
Constitute described control circuit (5), make the direction of scanning of row of selected a plurality of liquid crystal pixel (PX) of reversing in the writing of non-video signal and vision signal per image duration.
9. liquid crystal indicator as claimed in claim 3 is characterized in that,
Constitute described control circuit (5), carry out writing of vision signal more than 2 times in making during the described the 2nd, in the 2nd later vision signal writes, write with the 1st vision signal and write identical vision signal.
10. liquid crystal indicator as claimed in claim 4 is characterized in that,
Constitute described control circuit (5), make with the form of frame counter-rotating polarity, and frame frequency is more than the 75Hz the described pixel voltage of described a plurality of liquid crystal pixels (PX) counter-rotating.
11. a liquid crystal indicator is characterized in that possessing:
Be configured to a plurality of liquid crystal pixels (PX) of rectangular in fact,
With non-video signal and vision signal as pixel voltage, periodically write each pixel of described a plurality of liquid crystal pixel (PX) drive circuit (YD, XD); And
Control described drive circuit (YD, XD) action control circuit (5) regularly,
Constitute described control circuit (5), make in 1 image duration set be shorter than described 1 image duration the 1st during, with be shorter than simultaneously with overlapping during the 1st described 1 image duration the 2nd during, and Control Driver circuit (YD, XD), carry out writing in making during the 1st to the non-video signal of described a plurality of liquid crystal pixels (PX), carry out writing in during the 2nd to the vision signal of described a plurality of liquid crystal pixels (PX), during the described the 1st and in the overlapping period during the 2nd, with one or more horizontal cycle unit hocket writing of non-video signal and writing of vision signal.
12. liquid crystal indicator as claimed in claim 11 is characterized in that,
Constitute described control circuit (5), make described a plurality of liquid crystal pixels (PX) are reversed with row counter-rotating and frame in the reverse polarity of described pixel voltage of at least a mode.
13. liquid crystal indicator as claimed in claim 12 is characterized in that,
Constitute described control circuit (5), make during the described the 2nd in to described a plurality of liquid crystal pixels (PX) all finish the writing of vision signal after, set during the maintenance of described pixel voltage.
14. liquid crystal indicator as claimed in claim 13 is characterized in that,
Described a plurality of liquid crystal pixels (PX) are provided with back light portion, and (BL LD), and constitutes described control circuit (5), makes that (BL LD) only is controlled to and lights during described pixel voltage keeps with described back light portion.
15. liquid crystal indicator as claimed in claim 14 is characterized in that,
Temperature sensor (TS) is set, and constitutes described control circuit (5), make according to temperature sensor (TS) sensing in 1 image duration during the 2nd the temperature of the zero hour control.
16. liquid crystal indicator as claimed in claim 15 is characterized in that,
Constitute described control circuit (5), carry out writing of vision signal more than 2 times in making during the described the 2nd, in the 2nd later vision signal writes, write with the 1st vision signal and write identical vision signal.
17. liquid crystal indicator as claimed in claim 16 is characterized in that,
Constitute described control circuit (5), make to write scanning or vision signal writes at least a of scanning, select each gate line (Y) more than 2 times 1 scanning with the non-video signal.
18. liquid crystal indicator as claimed in claim 17 is characterized in that,
With the interval more than 1 horizontal cycle, carry out the selection more than 2 times of each gate line (Y).
19. a liquid crystal indicator is characterized in that possessing:
Be configured to rectangular in fact, and have a plurality of liquid crystal pixels (PX) of the following liquid crystal response speed of 10msec,
With non-video signal and vision signal as pixel voltage, periodically write each pixel of described a plurality of liquid crystal pixel (PX) drive circuit (YD, XD); And
Control circuit (5), this control circuit (5) be used for setting during the 1st and with different length during the 1st the 2nd during, make the time span that adds up to be no more than for 1 image duration, and Control Driver circuit (YD, XD), carry out in making during the 1st the writing of the non-video signal of described a plurality of liquid crystal pixels (PX), carry out writing in during the 2nd the vision signal of described a plurality of liquid crystal pixels (PX).
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| JP2005281822 | 2005-09-28 | ||
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| JP2006254251 | 2006-09-20 |
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| TW546624B (en) * | 2001-03-30 | 2003-08-11 | Matsushita Electric Ind Co Ltd | Display device |
| US7030848B2 (en) * | 2001-03-30 | 2006-04-18 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display |
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- 2006-09-28 CN CN2008101787095A patent/CN101409060B/en not_active Expired - Fee Related
- 2006-09-28 CN CNB2006101416274A patent/CN100514437C/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100514437C (en) | 2009-07-15 |
| CN101409060B (en) | 2011-11-09 |
| CN101409060A (en) | 2009-04-15 |
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