CN1957390A - Liquid crystal display device, driving method thereof, liquid crystal television having the liquid crystal display device and liquid crystal monitor having the liquid crystal display device - Google Patents

Abstract

A device is provided for setting a voltage applied to each of data signal lines so as to correct a voltage, applied to the pixel, which corresponds to a gradation data signal in each of sub-frames of a single frame. As such, voltage drop, caused by a combination of voltages of the gradation data signal in each of the sub-frames, may be partially or even fully compensated. On this account, it is possible to provide a liquid crystal display device which can lessen or even avoid an influence of the voltage drop caused by, for example, gate-drain capacitance of the thin film transistor in case of adopting time-division driving, and/or a method for driving the liquid crystal display device.

Description

Liquid crystal display, its driving method, have the LCD TV of liquid crystal display and have the LCD monitor of liquid crystal display

Technical field

The present invention relates generally to (i) liquid crystal display, (ii) the driving method of liquid crystal display (iii) has the LCD TV of liquid crystal display, and/or (iv) has the LCD monitor of liquid crystal display.

Background technology

[explanation of TFT (thin film transistor (TFT)) liquid crystal panel]

The TFT display panels uses not light-emitting component.Usually, backlight or reflecting plate are arranged on the back side of TFT liquid crystal panel, and the TFT liquid crystal panel according to brightness of backlight etc. to liquid crystal applied voltages changing the transmissivity of this liquid crystal, thereby display image.In the time will putting on the pixel of TFT liquid crystal panel corresponding to the voltage of display gradation data, the transmissivity of this pixel (liquid crystal aligning) is maintained to and applies next voltage, and gray scale intensities continues to show in single frame.

Usually, data rewrote with display image in TV etc. in each in frame period, thus in single frame in the pixel of TFT liquid crystal panel maintenance corresponding to certain brightness of these data.The CRT (cathode-ray tube (CRT)) of display mode that is called pulse mode (the wherein luminous pattern that stops immediately) with employing is different, and this TFT liquid crystal panel adopts a kind of pattern that is called the maintenance pattern.In this maintenance pattern, during the picture frame period that shows moving image, keep same show state, thereby between sight line and show state, deviation occurs.Deviation between sight line and the show state causes the image that blurs, so poor than in the pulse mode of the moving image display characteristic in the maintenance pattern.

In addition, liquid crystal molecule has anisotropy, thereby and voltage make the orientation change transmission change of liquid crystal molecule.Watching the situation of panel from frontal (from normal direction) and, there are differences with regard to transmissivity with regard to the voltage characteristic of transmissivity from watching with respect to the diagonal of frontal between the situation of panel with respect to panel surface.That is, liquid crystal panel has the viewing angle characteristic corresponding to display gray scale brightness.

In the situation of the image that in many people watch monitor resemble the TV, shows, depend on each visual angle and different picture characteristics is more worthless.On the contrary, CRT is self luminous, so it does not have this viewing angle characteristic.

Recently, the TFT liquid crystal panel has been widely used for TV etc., and has proposed the problems such as viewing angle characteristic such as the display quality and the liquid crystal panel of aforesaid moving image.

In order to attempt addressing these problems, following technology has been proposed.For example, publication number is Japanese unexamined patent (the open date: March 6 calendar year 2001) proposed a kind of driving method of 60078/2001 (Tokukai 2001-60078), in the method:, black is inserted in the single frame to improve moving image quality in order to improve response characteristic (moving image display quality).Publication number is Japanese unexamined patent (the open date: on March 19th, 1993) proposed a kind of driving method of 68221/1993 (Tokukaikei5-68221), in the method:, show that in single frame two brightness and its compound brightness are used to carry out gray scale intensities and show to improve viewing angle characteristic in order to improve viewing angle characteristic.According to these technology, different with common maintenance mode display driving, two or more brightness show in certain pixel in single frame when the single gray scale intensities of output.

[explanation of the introducing in the TFT liquid crystal panel (pull-in) (voltage drop)]

The TFT liquid crystal panel schematically is shown among Fig. 8.As shown in Figure 8, the TFT liquid crystal panel is configured to liquid crystal layer 3 and is clipped between TFT glass substrate 1 and the anti-glass substrate 2.Counter electrode 4 is arranged on a side of anti-glass substrate 2, and TFT element 6 is arranged on each pixel 5 of TFT glass substrate 1, and the drain electrode of TFT element 6 is connected with pixel electrode 7, shown in Fig. 9 (a) and 9 (b).

On TFT glass substrate 1, each bar provides the source electrode line 8 of data voltage vertically to be provided with to TFT element 6, and the gate line 9 of each bar conducting TFT element 6 flatly is provided with.Each bar source electrode line 8 is connected with the source electrode of TFT element 6 and each gate line 9 is connected with the grid line of TFT element 6.When the voltage of gate line 9 has high value, 6 conductings of TFT element, thus the voltage of source electrode line 8 is applied in the pixel electrode 7 that is positioned at drain electrode one side.When grid voltage grid when low ends, thereby the electric charge of pixel electrode 7 is kept.

As shown in Figure 10, between the grid of TFT element 6 and drain electrode, a capacitor is arranged, and pixel electrode 7 is coupled with grid 9 by capacitor Cgd.Therefore, when the grid of TFT element 6 by the time, capacitor Cgd cause pixel voltage introducing (pixel voltage is descended) thereby:

Δ V=Cgd/ (Clc+Ccs+Cgd) * Vgh, wherein Clc represents the electric capacity of liquid crystal, and Ccs represents the electric capacity of Cs, and Cgd represents the drain electrode-grid capacitance of TFT element 6, and Vgh represents the voltage difference between grid High (height) and the grid Low (low).

Therefore, as shown in figure 11, the voltage that puts on pixel electrode drops to than the low Δ V of writing voltage (being input to the voltage of data signal line).Under positive and negative polarity, pixel electrode voltage all drops to than the low Δ V of each writing voltage.In order to compensate above-mentioned voltage drop, the voltage that is used for voltage is put on the data signal wire driving circuit (source electrode driver hereinafter referred to as) of source electrode line is provided with as follows: the pixel voltage input pixel electrode of the high Δ V of voltage that in advance will be more required than each polarity, and carry out and proofread and correct with corresponding to this voltage drop.

When not carrying out timing, brightness changes between each polarity, thereby flicker occurs.This be because: the voltage corresponding to the potential difference (PD) between counter electrode voltage and the pixel electrode voltage is applied in liquid crystal layer 3, and the absolute value that puts on the voltage of liquid crystal layer 3 changes between positive polarity and negative polarity.

In addition, the value of above-mentioned liquid crystal capacitance Clc changes according to the state of liquid crystal molecular orientation.In liquid crystal display cells, the state of liquid crystal molecular orientation depends on the voltage that puts on liquid crystal and changes, and its transmission change shows to carry out gray scale intensities.Therefore, introducing voltage depends on display gray scale and changes.

As a result, shown in Figure 12 (a) and 12 (b), the increase that puts on the voltage of liquid crystal increases the specific inductive capacity of liquid crystal.Therefore, introducing voltage reduces.Notice that this relation depends on the dielectric property of liquid crystal.

As mentioned above, in the TFT liquid crystal panel, introduce voltage with respect to the change in voltage that puts on liquid crystal.Therefore, in electric current maintenance pattern, the output voltage that is used to drive the source electrode driver of liquid crystal panel changes, thereby the voltage drop of pixel electrode writing voltage is able to part even compensation fully in each gray scale.

Yet conventional liquid crystal display may have one of following point at least.

That is, in the time-division driving situation of (comprising that black inserts driving), promptly in dividing a frame with the situation that shows a certain gray scale, as shown in Figure 13, the output brightness of pixel is by the generation that repeats of two luminance states when certain gray scale intensities of output.In this case, liquid crystal aligning is by the generation that repeats of two states.

When subframe was with the back subframe before single frame is divided into, the state of liquid crystal molecular orientation was corresponding to the final state of orientation in the preceding subframe when applying back subframe voltage.In addition, before applying during subframe voltage the state of liquid crystal molecular orientation corresponding to the final state of orientation in the subframe of back.

That is, when applying pixel voltage in the subframe of back, liquid crystal capacitor Clc causes introducing voltage under the final state of orientation in preceding subframe.When applying pixel voltage in preceding subframe, liquid crystal capacitor Clc causes introducing voltage under the final state of orientation of back subframe.

Therefore, the introducing voltage Δ V that is caused by capacitor Cgd is different with the introducing voltage in the common maintenance mode activated, depends on that the liquid crystal aligning state in the last subframe of the subframe when applying voltage determines because introduce voltage Δ V.Note, in an example shown in Figure 13, in preceding subframe, carry out black display, show and in the subframe of back, carry out gray scale.

In this way, for the voltage on the pixel that puts on the TFT liquid crystal in time-division driving process, introducing voltage depends on the combination of subframe and changes.Therefore, introducing voltage should change and compensate this introducing voltage under positive polarity and the negative polarity according to the combination of subframe.

For example, in the situation of Tokukai 2001-60078, the state of liquid crystal molecular orientation is the black display state when applying signal data voltage.When applying black insertion signal voltage, this state of orientation is corresponding to the state of signal data voltage.In addition, in the situation of Tokukaihei 5-68221, state of orientation is corresponding to the state that is used to carry out another combination that gray scale shows.

Therefore, under this liquid crystal aligning state, can prepare the voltage drop that calibration equipment/method etc. is used to eliminate the introducing voltage that is caused by liquid crystal capacitor Clc.Yet Tokukai 2001-60078 and Tokukaihei5-68221 do not consider to introduce voltage.In these technology each all only applies data-signal.

Keep in the situation of pattern display driver at electric current, the introducing voltage that is caused by capacitor Cgd when applying voltage is corrected into: under each polarity about the introducing voltage of the output voltage of the input gray level signal value of the source electrode driver of TFT panel by part even compensation fully.Yet, in the situation about driving in the time-division, as mentioned above, introduce voltage and should depend on the combination of subframe and change, thereby current source electrode driver can not be provided for compensating output voltage about the introducing voltage of all output gray levels when the time-division drives.

In the situation of not carrying out the correction that is used for compensated voltage drop, a certain voltage is added to liquid crystal layer.Therefore, such as the ion (electric charge) of impurity in the liquid crystal layer etc. owing to the potential difference (PD) between the pixel electrode is shifted to an electrode.Alignment films is applied on the electrode of liquid crystal panel, and this alignment films insulate, thereby this alignment films has ion (electric charge).

Therefore, in the liquid crystal panel under being in the state that DC voltage component DC keeps for a long time, even when not applying voltage, also sustaining voltage in its pixel electrode.For example, when not calibrated halftone luminance letter with the elimination pressure drop shows for a long time with the calibrated black brightness of eliminating voltage drop, show the pixel charge charging that this is alphabetical.

As a result, even when stopping to show this letter and carrying out whole black display after long-time the demonstration, electric charge still remains in and once showed on this alphabetical pixel, thereby because the caused potential difference (PD) of this electric charge, this literal has residual slightly.Therefore, this scorification phenomenon can take place in the situation not carrying out the correction that is used for eliminating pressure drop.

Above-mentionedly be used for when the time-division drives compensation and introduce voltage method and set up as yet.Therefore, still there is at least one the problem that comprises in burning and the flicker in the TFT liquid crystal panel.

Summary of the invention

In at least one embodiment consideration the problems referred to above of the present invention at least one made.The purpose of at least one embodiment of the present invention provides: (i) liquid crystal display, can for example reduce or even avoid in the situation of taking branch to drive the caused voltage drop of gate-to-drain electric capacity by thin film transistor (TFT), (ii) the driving method of liquid crystal display (iii) has the LCD TV of liquid crystal display and/or (iv) has the LCD monitor of liquid crystal display.

In order to reduce even to solve for example one of the problems referred to above, the liquid crystal display of at least one embodiment of the present invention relates to a liquid crystal display, each pixel that thin film transistor switch is formed on the node of many data signal lines and multi-strip scanning signal wire is so that display image and single frame is divided into subframe by the time shows with the carries out image gray scale.The liquid crystal display of at least one embodiment comprises: apply voltage part be set, be used to be provided with the voltage that puts on each bar data signal line, with correction put on pixel, with each subframe of single frame in the corresponding voltage of data gray signal.Like this, just can be improved by the voltage of the data gray signal in each subframe combination voltage drop that cause, the transistorized gate-to-drain electric capacity of based thin film, even partly or entirely be compensated.

In another embodiment, liquid crystal display be used for by corresponding switching device to each of a plurality of pixels carry out via the time partial image the gray scale of subframe show.This liquid crystal display comprises that the voltage that is applied is provided with device, be suitable for to put on based on the magnitude of voltage setting of last subframe at least in part the voltage of each respective pixel, so that compensate the voltage drop of each the respective switch device that causes by electric capacity at least in part.

The method of at least one embodiment of the present invention be used for driving liquid crystal display by corresponding switching device to each of a plurality of pixels carry out via the time partial image the gray scale of subframe show.This method comprises: will put on the voltage of each respective pixel at least in part based on the magnitude of voltage setting of last subframe, so that compensate the voltage drop of each the respective switch device that is caused by electric capacity at least in part.

In addition, for in helping even addressing the above problem at least one, being used to of at least one embodiment of the present invention drives the method for liquid crystal display forms thin film transistor switch on the node of many data signal lines and multi-strip scanning signal wire each pixel, so that display image and by the time single frame is divided into subframe and shows with the carries out image gray scale.The method of this at least one embodiment may further comprise the steps: the voltage that puts on every data signal line is set, so that proofread and correct the voltage corresponding to the data gray signal in each subframe of this single frame that puts on pixel.Like this, just can be improved by the voltage of the data gray signal in each subframe combination voltage drop that cause, the transistorized gate-to-drain electric capacity of based thin film, even partly or entirely be compensated.

That is, will put on corresponding to the voltage of data gray signal in the situation of each pixel by the data signal line in each subframe of single frame, the voltage drop corresponding to the voltage of data gray signal takes place in the transistorized gate-to-drain electric capacity of based thin film.

In at least one embodiment of the present invention, apply voltage be provided with the part setting put on the voltage of data signal line so that improve, the part compensation in addition all compensation corresponding to the voltage drop of the voltage of data gray signal.

As a result, the influence that can provide (i) can reduce even avoid in adopting the situation that the time-division drives the voltage drop that the gate-to-drain electric capacity by thin film transistor (TFT) causes, and/or the (ii) driving method of liquid crystal display.

In addition, for improve in addition address the above problem at least one problem, the liquid crystal display of at least one embodiment of the present invention can comprise: based on outputing to the output voltage of pixel electrode and be applied to the potential difference (PD) between the voltage of counter electrode and change the liquid crystal display of polarity in each frame, it will be divided into two or more period of sub-frame by the time in the frame period.Can carry out brightness like this shows, thereby carry out the minimum brightness demonstration at least one period of sub-frame in two or more period of sub-frame and (reach minimum or relative minimum, or be less than the value of first value) or high-high brightness show (reach maximal value or relative maximum, or greater than the value of second value).

The liquid crystal display of at least one embodiment can comprise that second voltage produces part, it comprises one of following or both: a plurality of outputs of first brightness, be used for exporting a plurality of output voltages to pixel electrode is less than the value of first value with execution relative minimum brightness demonstration, each output voltage comprises similar potential difference (PD) between pixel electrode and counter electrode; With a plurality of outputs of second brightness, be used for exporting a plurality of output voltages to pixel electrode and show that with the relative high-high brightness that execution reaches greater than the value of second value each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

In at least one embodiment, liquid crystal display is suitable in each frame period of image coming changed polarity based on output voltage that exports pixel electrode to and the potential difference (PD) that puts between the voltage of counter electrode, this frame period is divided into two or more period of sub-frame by the time and shows to carry out brightness, thus carry out at least one period of sub-frame that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness in showing one of at least.This liquid crystal display comprises device for generating voltage.This device for generating voltage comprises one of following or both: a plurality of output units of first brightness, be suitable for a plurality of output voltages export to pixel electrode with carry out relative minimum brightness and show and the minimum brightness demonstration in one of at least, each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; With a plurality of output units of second brightness, be used for a plurality of output voltages export to pixel electrode with carry out relative high-high brightness and show and the high-high brightness demonstration one of at least, each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

In addition, for improve in addition address the above problem at least one problem, the method that being used for of at least one embodiment of the present invention drives liquid crystal display can comprise: based on outputing to the output voltage of pixel electrode at each frame and being applied to the potential difference (PD) between the voltage of counter electrode and changing polarity, it will be divided into two or more period of sub-frame by the time in the frame period, thereby so that carry out carrying out in brightness demonstration at least one period of sub-frame in two or more period of sub-frame the relative minimum brightness demonstration of the value that is less than first value, or the relative high-high brightness that reaches greater than the value of second value shows.

The method of at least one embodiment one of can comprise the following steps or both: export a plurality of output voltages to pixel electrode is less than the value of first value with execution relative minimum brightness and show that each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; And export a plurality of output voltages to pixel electrode and show that with the relative high-high brightness that execution reaches greater than the value of second value each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

In at least one embodiment, a kind of method is the method that is used to drive liquid crystal display, wherein in each frame period of image, polarity is based on outputing to the output voltage of pixel electrode and be applied to the potential difference (PD) between the voltage of counter electrode and change in each frame, this frame period is divided into two or more period of sub-frame by the time and shows to carry out brightness, thus carry out at least one period of sub-frame that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness in showing one of at least.This method comprises: with a plurality of first output voltages export to pixel electrode with carry out relative minimum brightness and show and the minimum brightness demonstration in one of at least, each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; And with a plurality of output voltages export to pixel electrode with carry out relative high-high brightness and show and the high-high brightness demonstration in one of at least, each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

According at least one embodiment of the present invention, liquid crystal display can comprise that second voltage produces part, it comprise following both or one of: a plurality of outputs of first brightness, be used for exporting a plurality of output voltages to pixel electrode is less than the value of first value with execution relative minimum brightness demonstration, each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; With a plurality of outputs of second brightness, be used for exporting a plurality of output voltages to pixel electrode and show that with the relative high-high brightness that execution reaches greater than the value of second value each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

Therefore, from minimum or relatively minimum brightness voltage or maximum or select the maximum voltage relatively with other subframe in the corresponding relative minimum brightness of output voltage (more black relatively) output voltage or high-high brightness (whiter relatively) output voltage relatively, thereby possibility compensating pole sexual deviation.

In at least one embodiment, liquid crystal display be used for by corresponding switching device to each of a plurality of pixels realize via the time partial image the gray scale of subframe show.This liquid crystal indicator comprises: will put on the voltage of each respective pixel at least in part based on the magnitude of voltage setting of last subframe, with the device of the voltage drop that compensates each the respective switch device that is caused by electric capacity at least in part; And the device that is used to apply this voltage.

In at least one embodiment, a kind of method is to be used for driving the method that liquid crystal display shows with each the gray scale of carrying out a plurality of pixels.This method comprises: image is divided into a plurality of subframes by the time; The bucking voltage of each respective pixel is set based on the magnitude of voltage of last subframe at least in part; And each respective pixel applied set voltage.

In at least one embodiment, a kind of method is to be used for driving the method that liquid crystal display shows with each the gray scale of carrying out a plurality of pixels, and each two field picture is divided into a plurality of subframes by the time.This method comprises: the bucking voltage that each respective pixel is set based on the magnitude of voltage of last subframe at least in part; And each respective pixel applied set voltage.

In at least one embodiment, liquid crystal display each the gray scale that is used for carrying out a plurality of pixels shows that each two field picture is divided into a plurality of subframes by the time.This display device comprises: controller is suitable for being provided with based on the magnitude of voltage of last subframe at least in part the bucking voltage of each respective pixel; And driving circuit, be suitable for each respective pixel is applied set voltage.

In at least one embodiment, liquid crystal display each the gray scale that is used for carrying out a plurality of pixels shows that each two field picture is divided into a plurality of subframes by the time.This display device comprises: the device that is used for being provided with based on the magnitude of voltage of last subframe at least in part the bucking voltage of each respective pixel; And the device that is used for each respective pixel is applied set voltage.

In addition, for improve in addition address the above problem at least one problem, the LCD TV of at least one embodiment of the present invention can comprise: the liquid crystal display of at least one the foregoing description; And the tuner pack that is used as the video signal source of liquid crystal display, its is selected the channel of television broadcasting signal and will select the television video frequency signal of channel to export as shows signal.

According at least one the foregoing description of the present invention, a kind of LCD TV may be provided, comprise following one of at least: (i) liquid crystal display, it can reduce even avoid in adopting the situation that the time-division drives the influence of the voltage drop that the gate-to-drain electric capacity by thin film transistor (TFT) causes; And/or the (ii) driving method of liquid crystal display.

In addition, for improve in addition address the above problem in one of at least, the LCD monitor of at least one embodiment of the present invention can comprise: the liquid crystal display of at least one the foregoing description; And the monitor signal processing section that is used as the video signal source of liquid crystal display, the monitor signal that this section processes should show on liquid crystal display, and the monitor signal that will handle is exported as vision signal.

At least one embodiment according to foregoing invention, a kind of LCD monitor may be provided, comprise following one of at least: (i) can reduce even avoid in adopting the situation that the time-division drives liquid crystal display by the influence of the caused voltage drop of gate-to-drain electric capacity of thin film transistor (TFT); And/or the (ii) driving method of this liquid crystal display.

The characteristic of various aspects and advantage illustrate in greater detail exemplary embodiment below in conjunction with accompanying drawing for a more complete understanding of the present invention.

Description of drawings

Fig. 1 (a) is the block diagram that an embodiment of liquid crystal display of the present invention is shown.

Fig. 1 (b) is the block diagram of an embodiment of drawing that the lcd controller 14 of Fig. 1 (a) is shown.

Fig. 1 (c) is the example of operation of the frame memory of Fig. 1 (b).

Fig. 2 illustrates the data of incoming video signal data gray-scale value and how to change in liquid crystal display.

Fig. 3 (a) is the oscillogram that is illustrated in the waveform of the voltage on the pixel that the time-division puts on liquid crystal display when driving.

Fig. 3 (b) is the oscillogram that is illustrated in the waveform of the shadow tone display voltage on the pixel that the time-division puts on liquid crystal display when driving.

Fig. 3 (c) is the oscillogram that is illustrated in the waveform of the black display voltage on the pixel that the time-division puts on liquid crystal display when driving.

Fig. 4 (a) is the oscillogram without the output brightness of changing display panel that liquid crystal display is shown.

Fig. 4 (b) is the oscillogram that the output brightness through changing display panel of liquid crystal display is shown.

Fig. 5 (a) is the block diagram that a kind of configuration of the LCD TV that is equipped with liquid crystal display is shown.

Fig. 5 (b) is the block diagram that a kind of configuration of the LCD monitor that is equipped with liquid crystal display is shown.

Fig. 6 (a) illustrates another embodiment of the present invention, and it is illustrated in how source electrode driver distributes output resistance under the positive polarity.

Fig. 6 (b) illustrates another embodiment of the present invention, and it is illustrated in how source electrode driver distributes output resistance under the negative polarity.

Fig. 7 is illustrated in the relation between the input gray level and output gray level in the liquid crystal display.

Fig. 8 is the viewgraph of cross-section of configuration that the display panel of liquid crystal display is shown.

Fig. 9 (a) is the planimetric map that the pixel arrangement in the display panel of liquid crystal display is shown.

Fig. 9 (b) is the synoptic diagram that the configuration of TFT element set on each pixel is shown.

Figure 10 is the planimetric map that the gate-to-drain capacitor in the pixel is shown.

Figure 11 is the oscillogram that illustrates by the caused introducing voltage of the gate-to-drain electric capacity in the pixel (voltage drop).

Figure 12 (a) illustrates the voltage that puts on liquid crystal and the curve map of the relation between the liquid crystal specific inductive capacity.

Figure 12 (b) illustrates voltage that puts on liquid crystal and the curve map of introducing the relation between the voltage.

Figure 13 is the oscillogram that is illustrated in the output brightness of time-division when exporting certain gray scale when showing.

Figure 14 (a) is illustrated in the oscillogram that puts on the grid voltage of pixel in the liquid crystal display when the time-division drives.

Figure 14 (b) is the oscillogram that is illustrated in the shadow tone display voltage that puts on pixel in the liquid crystal display when the time-division drives.

Figure 14 (c) is the oscillogram that is illustrated in the black display voltage that puts on pixel in the liquid crystal display when the time-division drives.

Figure 15 (a) illustrates the synoptic diagram of introducing the relation between voltage and the gray scale.

Figure 15 (b) is the synoptic diagram that the relation between writing voltage and the gray scale is shown.

Figure 15 (c) illustrates the voltage that puts on liquid crystal and the synoptic diagram of the relation between the gray scale.

Figure 16 (a) is illustrated in the time-division and shows that the input gray level data are the relation between waveform and the liquid crystal aligning state in the situation of shadow tone when showing.

Figure 16 (b) is illustrated in the time-division and shows that the input gray level data are the relation between waveform and the liquid crystal aligning state in the situation of black when showing.

Figure 17 (a) is that the frame that illustrates under the positive polarity of source electrode driver divides the synoptic diagram of output resistor ladder.

Figure 17 (b) is that the frame that illustrates under the negative polarity of source electrode driver divides the synoptic diagram of output resistor ladder.

Figure 18 illustrates another embodiment of the present invention, and it is the block diagram that a kind of configuration of source electrode driver is shown.

Figure 19 illustrates a kind of configuration of the resistor ladder of reference voltage generating circuit in the source electrode driver.

Figure 20 is the curve map that is illustrated in the relation between the input gray level data and output voltage in the situation of normal black.

Figure 21 is the curve map that is illustrated in the source electrode driver relation between the input gray level data and output voltage in the situation of relatively black in a large number (minimum brightness relatively) voltage of output and relatively white in a large number (relative high-high brightness) voltage.

Figure 22 is illustrated in the configuration of the resistor ladder that is positioned at relatively black (minimum brightness relatively) side in the reference voltage generating circuit of source electrode driver.

Figure 23 is illustrated in the configuration of the resistor ladder that is positioned at relatively white (high-high brightness relatively) side in the reference voltage generating circuit of source electrode driver.

Realize preferred forms of the present invention

[embodiment 1]

Below with reference to Fig. 1-5 and Fig. 8-12 one embodiment of the present of invention are described.

As shown in Figure 8, the display panel 13 of the liquid crystal display 10 of an exemplary embodiment has sandwich construction, and wherein liquid crystal layer 3 is set between TFT (thin film transistor (TFT)) glass substrate 1 and the anti-glass substrate 2.Counter electrode 4 is set on the whole surface of anti-glass substrate 2, and TFT element 6 is set on each pixel 5 in the TFT glass substrate 1 shown in Fig. 9 (a) and 9 (b), and the drain electrode of TFT element 6 is connected with pixel electrode 7.

On TFT glass substrate 1, as providing the source electrode line 8 of the data signal line of data voltage vertically to be provided with to TFT element 6, and the gate line 9 that is used as the scan signal line of conducting TFT element 6 flatly is provided with.Each bar source electrode line 8 is connected with the source electrode of TFT element 6, and each bar gate line 9 is connected with the grid of TFT element 6.When the voltage of gate line 9 has high value, 6 conductings of TFT element, thus the voltage of source electrode line 8 is applied in the pixel electrode 7 that is positioned at drain electrode one side.When grid voltage when low, grid ends, thus the electric charge of pixel electrode 7 is held.

As shown in Figure 10, pixel electrode 7 has a capacitor between the grid of TFT element 6 and drain electrode, and is connected with gate line 9 by capacitor Cgd.Therefore, when the grid of TFT element by the time, capacitor Cgd has pixel voltage to satisfy the introducing voltage of following equation:

ΔV＝Cgd/(Clc+Ccs+Cgd)×Vgh。

At this, Clc represents the electric capacity of liquid crystal, and Ccs represents the electric capacity of Cs, and Cgd represents the drain electrode-grid capacitance of TFT element 6, and Vgh represents the voltage difference between grid High and the grid Low.

Therefore, as shown in figure 11, the voltage decline Δ V that applies from source electrode line.Its polarity is that the pixel voltage of plus or minus is than the low Δ V of the voltage that puts on source electrode line.Therefore, in advance source electrode driver output voltage is arranged to high Δ V.

Liquid crystal capacitance Clc in above-mentioned equation has the state of orientation that depends on liquid crystal and the value that changes.That is, when keeping the pattern display driver, the intensity of introducing voltage depends on display gray scale and acute variation usually.In this case, put on the voltage and the relation between the liquid crystal specific inductive capacity of liquid crystal and put on the voltage of liquid crystal and the relation between the voltage introduced shown in Figure 12 (a) and 12 (b).Notice that these relations are subjected to the influence of dielectric property of liquid crystal very big.

In the display panel 13 that uses TFT element 6, introducing voltage is relevant to the voltage that is applied and changes.Therefore, with maintenance mode activated liquid crystal panel the time, will be used for part even compensate the voltage of introducing voltage fully adding to writing voltage, and bucking voltage is to each grey scale change usually.That is, will be used for part even compensate the obtained voltage of introducing voltage fully being applied to panel pixel from source electrode driver by adding as writing voltage.

In addition, in the liquid crystal display 10 of an exemplary embodiment, in order to improve response (moving image display quality) characteristic and to improve such as picture qualities such as viewing angle characteristics, black can be inserted in the single frame obtaining higher picture quality, or can show in single frame that two brightness show to obtain better viewing angle characteristic its compound brightness is used to carry out gray scale intensities.In the situation of these technology, different with common maintenance pattern display device driving, can when the single gray scale intensities of output, show the two or more brightness in the single frame.

More specifically, the liquid crystal display 10 of an exemplary embodiment is normally carried out black mode and is driven, and a frame is divided into two subframes.In addition, liquid crystal display 10 is carried out time-division driving (comprising that black inserts), thereby the output brightness in the subframe is identical when output black brightness.

Notice that in one exemplary embodiment, liquid crystal display 10 is normally carried out black mode and driven.Yet this driving is not limited in this.Liquid crystal display 10 can normally be carried out white mode and drive.In addition, a frame is divided into two subframes, but the division of frame is not limited in this.A frame can be divided into a plurality of subframes, comprises more than two sub-frames.For example, a frame can be divided into three or three above subframes.In addition, needn't equally divide a frame.

In this time-division drove, a frame was divided into a plurality of subframes, and output one brightness in each subframe, and the compound brightness of all brightness in the single frame is output brightness.Therefore, shown in Figure 14 (a), in the single frame period, twice voltage is applied to pixel electrode 7 from source electrode line.

Usually, when the maintenance pattern shows, in display panel 13, show in the situation of certain gray scale, be input to the intensity of input signal gray scale of source electrode driver 11 and the relation between the voltage introduced shown in Figure 15 (a); Be input to the intensity of input signal gray scale of source electrode driver 11 and the relation between the writing voltage shown in Figure 15 (b); Be input to the intensity of input signal gray scale of source electrode driver 11 and the relation between the voltage of liquid crystal of putting on shown in Figure 15 (c).Note, in these figure, for convenience of description, be relevant to introducing voltage Vpom, writing voltage (positive polarity: Vh, the negative polarity: Vl) all proportional of gray scale with input gray level with the voltage (Vi) that puts on liquid crystal.Thereby these values are different from actual value.

Usually, according to the source electrode driver reference voltage set in advance introduce voltage Vpom, writing voltage (positive polarity: Vh, negative polarity: Vl) and put on relation between the voltage (Vi) of liquid crystal, thereby:

Positive polarity: Vh (k)=Vcom+Vpom (k)+Vi (k)

Negative polarity: Vl (k)=Vcom+Vpom (k)-Vi (k)

Wherein the source electrode driver input gray level is k.At this, inverse voltage Vcom is indicated by the magnitude of voltage of counter electrode 4, and is steady state value.

When these values were set in this way, the intermediate value between writing voltage Vh (k) and the writing voltage Vl (k) was [inverse voltage Vcom+ introduces voltage Vpom (k)].That is (Vh (k)+Vl (k))/2=Vcom+Vpom (k).

Usually, when showing that the input signal gray-scale value is Ki in the maintenance pattern shows, the following actuator input signal gray-scale value that is input to source electrode driver is ki.The output voltage of source electrode driver 11 is the values that are provided with respect to gray-scale value Ki in advance in this case, promptly when polarity be timing, output Vh (ki), and when polarity when negative, export Vl (ki).Therefore, following equation is set up:

Positive polarity: Vh (ki)=Vcom+Vpom (ki)+Vi (ki)

Negative polarity: Vl (ki)=Vcom+Vpom (ki)-Vi (ki)

Therefore, pixel voltage Vhd and Vld are as follows:

Positive polarity: Vhd (ki)=Vh (ki)-Vcom (ki)=Vcom+Vi (ki)

Negative polarity: Vld (ki)=Vl (ki)-Vcom (ki)=Vcom+Vi (ki).

Under positive polarity, voltage Vi (ki) is put on liquid crystal according to the inverse voltage of counter electrode 4.Under negative polarity, voltage-Vi (ki) is put on liquid crystal according to the inverse voltage of counter electrode 4.

Thereby the potential difference (PD) under positive polarity between pixel electrode voltage and the inverse voltage Vcom is identical with the potential difference (PD) absolute value between pixel electrode voltage and the inverse voltage under negative polarity, polarity opposite (positive and negative).That is, the DC voltage component DC that puts on the voltage of liquid crystal is 0V.The DC voltage component DC that adds to liquid crystal is 0 state, is meant that with add to the average value that applies voltage that obtained of the voltage of liquid crystal and the voltage that adds to liquid crystal under negative polarity under positive polarity be 0 state.

When the time-division of an exemplary embodiment drives, for example, the situation that drives in the time-division that is used for a frame period of five equilibrium shown in Figure 14 (a) and 14 (b), shadow tone shows that input signal gray-scale value ki is converted into preceding sub-frame drive device input signal gray-scale value p and back sub-frame drive device input signal gray-scale value k, and this gradation data is input to source electrode driver 11.Thereby with respect to showing input signal gray-scale value ki, the driver output voltage the when time-division drives in preceding subframe is as follows:

Positive polarity: Vh (p)=Vcom+Vpom (p)+Vi (p)

Negative polarity: Vl (p)=Vcom+Vpom (p)-Vi (p).

Driver output voltage is as follows in the subframe of back:

Positive polarity: Vh (k)=Vcom+Vpom (k)+V (k)

Negative polarity: Vl (k)=Vcom+Vpom (k)-V (k).

Thereby, shown in Figure 14 (a) and 14 (c), be 0 o'clock at the display input signals gray-scale value, p=k=0, thus the voltage that puts on pixel in preceding subframe is as follows:

Positive polarity: Vh (0)=Vcom+Vpom (0)+Vi (0)

Negative polarity: Vl (0)=Vcom+Vpom (0)-Vi (0).

Voltage in the subframe of back is as follows equally:

Positive polarity: Vh (0)=Vcom+Vpom (0)+Vi (0)

Negative polarity: Vl (0)=Vcom+Vpom (0)-Vi (0).

This causes the pixel electrode waveform shown in Figure 14 (c).

Then, let us considers to be input to input signal mutual different situation in a subframe and another subframe of source electrode driver 11.For example, shown in Figure 14 (b), when input signal is a shadow tone and when being output as black in the back in the subframe, input gray level signal ki is used as source electrode driver signal gray-scale value p and is used as source electrode driver signal gray-scale value 0 in the subframe of back in preceding subframe, thereby this gray-scale value is converted and is input to source electrode driver 11.The voltage that puts on pixel electrode 7 in preceding subframe is as follows:

Positive polarity: Vh (p)=Vcom+Vpom (p)+Vi (p)

Negative polarity: Vl (p)=Vcom+Vpom (p)-Vi (p).

In the subframe of back, driver output voltage is as follows:

Positive polarity: Vh (0)=Vcom+Vpom (0)+Vi (0)

Negative polarity: Vl (0)=Vcom+Vpom (0)-Vi (0).

Determine to introduce the voltage of pixel electrode 7 afterwards according to applying voltage and introducing voltage Δ V.Introduce voltage Δ V and depend on that mesomorphic state determines.Thereby, driving in the situation that changes mesomorphic state, be different from the maintenance mode activated by the time-division, introducing voltage Δ V is not the Vpom that depends on that source electrode driver input signal gray scale is determined.

That is, as mentioned above, it is as follows to introduce voltage Δ V:

ΔV＝Cgd/(Clc+Ccs+Cgd)×Vgh。

At this, Cgd represents the gate-to-drain electric capacity of TFT element 6, and Clc represents liquid crystal capacitance, and Ccs represents Cs electric capacity, and Vgh represents the voltage difference (potential difference (PD) when grid ends) between grid High and the grid Low.

Be worth to determine Δ V according to these.In these values, liquid crystal capacitance Clc depends on the liquid crystal aligning state and the value that changes, and value in addition is a constant.Therefore, introduce voltage Δ V and depend on that the mesomorphic state when applying voltage determines.

With regard to the mesomorphic state in the situation of the voltage that puts on pixel shown in Figure 14 (a)-14 (c), the liquid crystal aligning state is as shown in Figure 16 (a) and 16 (b).

That is, as shown in Figure 16 (a), when showing that the input signal gray-scale value is black (0), the liquid crystal aligning state is constant, thereby the introducing voltage of introducing the source electrode driver input gray level value (being similarly 0) in voltage Δ V and the subframe is identical, so

ΔV＝Vpom(0)。

And as shown in Figure 16 (a), showing that the input data are in the situation of shadow tone, the liquid crystal condition in the time will putting on pixel corresponding to the voltage of source electrode driver input signal gray-scale value depends on that the state of orientation after liquid crystal has responded in preceding subframe determines.That is, mesomorphic state does not depend on the source electrode driver input signal gray-scale value when applying voltage and depends on that the source electrode driver input signal gray-scale value in the border is determined between the subframe.

Therefore, when importing in preceding subframe, the introducing voltage Δ V of source electrode driver input signal gray-scale value p is as follows:

ΔV＝Vpom(0)。

When importing in the subframe of back, source electrode driver input signal gray-scale value is 0, and it is as follows to introduce voltage Δ V:

ΔV＝Vpom(p)。

Therefore, the value of introducing voltage becomes the value that depends on the source electrode driver input signal gray-scale value in other subframe of subframe combination.

As mentioned above, when showing that the input gray level value is ki, when source electrode driver input signal gray-scale value was p, and when source electrode driver input signal gray-scale value was 0, the voltage that puts on pixel was as follows in the subframe of back in preceding subframe:

In preceding subframe,

Positive polarity: Vh (p)=Vcom+Vpom (p)+Vi (p)

Negative polarity: Vl (p)=Vcom+Vpom (p)-Vi (p).

In the subframe of back,

Positive polarity: Vh (0)=Vcom+Vpom (0)+Vi (0)

Negative polarity: Vl (0)=Vcom+Vpom (0)-Vi (0).

In preceding subframe, the positive and negative polarity of introducing pixel voltage is as follows:

Positive polarity: Vhd (p)=Vh (p)-Vpom (0)

＝Vcom+Vi(p)+(Vpom(p)-Vpom(0))

Negative polarity: Vld (p)=Vl (p)-Vpom (0)

＝Vcom+-Vi(p)+(Vpom(p)-Vpom(0))

In the subframe of back, positive and negative polarity is as follows:

Positive polarity: Vhd (p)=Vh (0)-Vpom (p)

＝Vcom+Vi(p)+(Vpom(0)-Vpom(p))

Negative polarity: Vld (p)=Vl (0)-Vpom (p)

＝Vcom+-Vi(p)+(Vpom(0)-Vpom(p))

Thereby in preceding subframe, the absolute value that puts on the voltage of liquid crystal becomes higher under positive polarity so that (Vpom (p)-Vpom (0)), and becomes lower under negative polarity.In addition, in the subframe of back, the absolute value that puts on the voltage of liquid crystal becomes higher under positive polarity so that (Vpom (0)-Vpom (p)), and becomes lower under negative polarity.At this, under positive and negative polarity before all and the DC voltage component DC that puts on the voltage of liquid crystal in back period of sub-frame (two frame periods) be 0.

Yet the absolute value that puts on the voltage of liquid crystal in the subframe under positive polarity is different from the absolute value that puts on the voltage of liquid crystal in the subframe under negative polarity, and luminance difference occurs between the polarity of subframe, thereby flicker occurs.

In addition, in the situation that liquid crystal responds fully, during aforesaid two frame periods, the absolute value that puts on the voltage that puts on liquid crystal in absolute value and the subframe of voltage of liquid crystal under the negative polarity in the subframe under positive polarity is identical.Yet liquid crystal should be finished response in subframe (0-100%) when the conversion of all gray scales.Can not finish in this way in the situation of response at liquid crystal, under positive polarity, put on the absolute value of voltage of liquid crystal and the absolute value that under negative polarity, puts on the voltage of liquid crystal and differ from one another.Therefore, scorification appears as mentioned above.

In order to alleviate even to address this is that, in one exemplary embodiment, under positive and negative polarity, carry out the combination of data-switching, and be applied in panel pixel by partly even fully compensating the voltage that is obtained of introducing voltage with the response subframe.

[subframe+positive polarity/negative polarity data-switching]

Particularly, when the data input signal gray-scale value that is used for display image when the time-division drives is ki, and the input signal gray scale in preceding subframe is p, and when the input gray level signal in the back subframe is k, the output of source electrode driver voltage should be provided with as follows, so that the DC voltage component DC in the subframe of back is 0.

Positive polarity: Vh (k)=Vcom+Vpom (p)+Vi (k)

Negative polarity: Vl (k)=Vcom+Vpom (p)-Vi (k)

Thereby output voltage not only relates to source electrode driver input signal gray-scale value, but also relates to the source electrode driver input signal gray-scale value in other subframe of combination.That is, output voltage relates to p when source electrode driver input signal gray-scale value is k, is arranged to input gray level value k but only there is single output valve not export under each polarity that is arranged in the positive and negative polarity according to current source electrode driver.

The output of driver enter drive

K, polarity → Vh (k, positive polarity), Vl (k, negative polarity)

Therefore, source electrode driver input signal gray-scale value k is converted, and the source electrode driver signal gray-scale value of positive polarity is converted into k++ and the source electrode driver signal gray-scale value of negative polarity is converted into k-, thereby driver output is the voltage of expectation, and the value through conversion is input to source electrode driver 11 then.K++ in this case and k-obtain according to following equation.

{Vh(k+)+Vl(k-)}＝Vpom(p)+Vcom

{Vh(k+)Vl(k-)}＝Vi(k)

In addition, under the slower situation of the response of liquid crystal, in subframe, do not realize desired liquid crystal aligning state, thereby this state does not correspond to k+ and the k-that is calculated.In the situation of the slower liquid crystal of its response in this way (in subframe, not finishing the liquid crystal of response), determine the value of k+ and k-according to the optical measurement result.

Source electrode driver input gray level data in the preceding subframe are also changed similarly.

The process of time-division ground translation data is below schematically described.As shown in Figure 2, data input signal gray-scale value ki at first by the time-division convert subframe gray-scale value p and k to, and the source electrode driver input signal gray-scale value in preceding subframe under positive polarity and the negative polarity is converted into p+ and p-, and the source electrode driver input signal gray-scale value under positive polarity and the negative polarity is converted into k+ and k-in the subframe of back, so that become driver input gray level value.

Can source electrode driver input signal grayvalue transition be become p+ by using four conversion LUT, k+, p+-and k-come showing that input signal data ki carries out data-switching.

In one exemplary embodiment, shown in Fig. 1 (a)-1 (c), when data DATA is input to source electrode driver 11, import data DATA by tracing table LUT as the lcd controller 14 that applies the voltage setting device.The data of input tracing table LUT are data that the RGB data of its 60Hz have become the RGB data of 120Hz, and this imports with the demonstration polar signal.Tracing table LUT is the circuit that is used for the input data-switching is become the output data that is relevant to data DATA of expectation.The combination that is relevant to the output gray level of these data is stored among the tracing table LUT in advance.The value of this combination depends on polarity and subframe and changes.The input and output of tracing table LUT are by timing controller 12 controls.

Fig. 1 (b) illustrates the example of details of the cooperation of lcd controller 14 and it and LUT.As shown in Fig. 1 (b), the LUT storage is about each polarity of input gray level data and the data of each subframe.Shown in Fig. 1 (b) gradation data is imported in the situation of lcd controller 14, data convert Dual-rate Data to by frame memory shown in the use for example in this exemplary embodiment.Then, change data from frame memory according to polarity and subframe (for example as Fig. 1 (b) shown in, providing) by LUT in when output, and as shown in the figure data converted like this is exported to LUT.Frame memory can be DRAM, SDRAM, FIFO or any other storer that can carry out above-mentioned functions.

Fig. 1 (c) illustrates the example of operation of the frame memory of the lcd controller 14 as shown in Fig. 1 (b).In the situation of for example importing 128 gray scales, its signal data is input to frame memory.Export twice at data interval with the field cycle in single frame.When exporting in preceding subframe, the 128-data are transfused to LUT.For the 128-data, LUT stores four groups of data corresponding to front and back subframe and positive-negative polarity in advance.Routine as shown below, in response to the input of the positive polarity in preceding subframe, LUT is output as 1.

In addition, in the situation of the positive polarity of back in the subframe, thereby output 150 inputs to panel (source electrode driver) with double frequency.In the situation of the negative polarity in preceding subframe, thereby output 6 inputs to panel (source electrode driver) with double frequency.In the subframe of back in the situation of negative polarity, thereby output 138 inputs to panel (source electrode driver) with double frequency.The data of storing among the LUT have the value that obtains from the introducing of the voltage of source electrode driver output by estimating.

For source electrode driver, align with negative polarity in each determine 0-255 output voltage.From 255 * 2 voltages, be each subframe and each polarity calculating optimum voltage.Thereby the optical voltage that is calculated is stored among the LUT.

Example as shown above, when 128 gray scales were transfused to, each output in the preceding subframe was black voltage output (1 and negative polarity of positive polarity 6).In by the situation of pre-estimating the value that introducing obtains (for example 150 under the positive polarity and for example 138 under the negative polarity), suppose that 128 gray scales in the subframe of back will cause the black voltage output (6 under 1 and the negative polarity under the positive polarity) in the preceding subframe to be stored in advance among the LUT, then needn't store preceding subframe.

In fact, as long as being given value, one of front or rear subframe (causes for example black voltage output or voltage of white output, or known relative minimum or minimum value, or relative maximum or maximal value), then aforesaid lcd controller 14 can be known must determine other subframe (unknown front or rear subframe).In case known, then can from LUT, obtain correct information.

Yet, should understand, comprise be used for when subframe is made comparisons with LUT before and after other, reception and postpone before or after second delay memory of extra memory of comparison of subframe and LUT dispose and can selectively use, wherein the subframe value each all be stored, make comparisons with single or independent LUT then.Because each subframe at first is stored in the storer, so can simply compare with LUT.

Provide tracing table (LUT) to carry out a whole example of conversion now.Table 1 illustrates an example of simple conversion.Notice that in one exemplary embodiment, tracing table LUT is arranged as follows: a frame is divided into two subframes, and carries out the combination of subframe, thereby in a subframe, show relative minimum or minimum value or relative maximum or maximal value.

At this, brightness is a nature as minimum value or maximal value.Yet, in fact, only it is found that by making brightness just may obtain identical effect near minimum value or maximal value (for example, only brightness is arranged to be no more than the relative minimum (for example peaked 0.02%) of first value or be arranged to be no more than the relative maximum (for example peaked 80%) of second value).

Table 1

The input signal grey	Just preceding subframe	Positive back subframe	Subframe before negative	Negative back subframe
					Ki	p+	k+	p-	k-
The input example
					0	0	0	4	4
64	1	63	3	65
					128	2	128	2	128
196	3	193	1	191
					255	4	255	0	251

That is, as shown in Figure 1, when data input signal gray scale ki be for example shadow tone 64 the time, just before the gray-scale value (p+)=1 of subframe, the gray-scale value (k+)=63 of positive back subframe, negative before the gray-scale value (p-)=3 of subframe, the gray-scale value (k-)=65 of negative back subframe.Simultaneously, when data input signal gray scale ki be shadow tone 128 the time, just before the gray-scale value (p+)=2 of subframe, the gray-scale value (k+)=128 of positive back subframe, negative before the gray-scale value (p-)=2 of subframe, the gray-scale value (k-)=128 of negative back subframe.As mentioned above, in the situation of shadow tone, just before subframe gray-scale value (p+), positive back subframe gray-scale value (k+), negative before subframe gray-scale value (p-) and negative after the gray-scale value (k-) of subframe change according to data input signal gray-scale value ki.

In addition, when data input signal gray-scale value ki is black display, just before the gray-scale value (p+)=0 of subframe, the gray-scale value (k+)=0 of positive back subframe, negative before the gray-scale value (p-)=4 of subframe, the gray-scale value (k-)=4 of negative back subframe.

Like this, data are converted and data DATA is input to source electrode driver 11, thereby can improve the deviation of the DC component DC under each subframe polarity in the combination of some subframe.It is identical when as a result, the liquid crystal voltage of the liquid crystal voltage of positive polarity and negative polarity carries out black writing in subframe.Among Fig. 3 (a)-3 (c) each all illustrates the waveform of the voltage that puts on pixel in this case.

Be described improving effect aspect " before changing " and " after changing " below with reference to Fig. 4 (a) and 4 (b).

For example, shown in Fig. 4 (a), in the situation of 94 gray scale outputs, switched data are as follows under positive and negative polarity: preceding sub-frame data is 0 gray scale, and then sub-frame data is 193 gray scales.Therefore, the brightness of the brightness of output and output when negative writing differs from one another when just writing.This is because putting on the positive voltage of liquid crystal differs from one another with the negative voltage that puts on liquid crystal, thereby causes such as problems such as flickers.

Notice that the output of 94 gray scales can be based on 0 gray scale of (i) preceding sub-frame data and the (ii) back arithmetical mean of 188 gray scales of sub-frame data, but above-mentioned configuration is not based on such arithmetical mean.This is because in the situation of output, carry out γ and proofread and correct to show according to brightness execution gray scale in display panel 13.

On the contrary, after changing, data under the positive polarity and the data under the negative polarity differ from one another.Therefore, these data are converted into data DATA, thereby: sub-frame data is 0 gray scale and positive back sub-frame data is 193 gray scales just, and sub-frame data is that sub-frame data was 195 gray scales after 4 gray scales bear before negative.After this, data DATA is imported in the display panel 13.As shown in Fig. 4 (b), the panel luminance output under the positive polarity is exported with the panel luminance under the negative polarity has identical output brightness value.

In one exemplary embodiment, a side is black (minimum or relative minimum brightness) or white (maximum or relative high-high brightness), thereby has single combination and have single combination under positive polarity under negative polarity.Thereby, can come translation data by tracing table LUT.Measure optimum value in advance, thereby measured optimum value is stored among the tracing table LUT about all gray scales.No matter attention is used to show that with preceding subframe or back subframe black (minimum or relative minimum brightness) still white (maximum or relative high-high brightness) is what it doesn't matter.

As mentioned above, in lcd controller 14, the combination of subframe makes can carry out such conversion: put on the absolute value of voltage of liquid crystal with to put on the absolute value of voltage of liquid crystal with negative polarity in subframe identical with positive polarity in subframe.

As Tokukai 2001-60078, in many lines, inserting in the situation of black, can not carry out data-switching so that proofread and correct.That is, the multi-strip scanning line is chosen simultaneously, thereby the source electrode driver input gray level value in the pixel of many lines is identical.Therefore, in the situation of the driving method that this multi-strip scanning line is chosen simultaneously, in applying the subframe of black, do not carry out corresponding to the calibration shift of introducing voltage, so that choose the multi-strip scanning line simultaneously, and only the source electrode driver input gray level data in other subframe are carried out data-switching under positive polarity and the negative polarity.

In this case, thus carrying out this data-switching makes that obtaining the magnitude of voltage that comprises corresponding to the calibrated component of introducing voltage in applying the subframe of black becomes possibility.In other subframe that comprises with the corresponding calibrated component of caused introducing voltage in black output subframe, under positive polarity and negative polarity, carry out data-switching, thereby make that the mean value of the voltage that puts on liquid crystal during two frame periods is 0.By carrying out this conversion, may carry out such data-switching: the absolute value that puts on the voltage that puts on liquid crystal under absolute value and the negative polarity of voltage of liquid crystal under the positive polarity is all identical in two frame periods.

At this, as shown in Figure 1, liquid crystal display 10 comprises the video signal source 15 that is used to provide vision signal.In one exemplary embodiment, for example shown in Fig. 5 (a), video signal source 15 converts television broadcasting signal to television video frequency signal.That is, the LCD TV 20 of an exemplary embodiment not only comprises liquid crystal display 10, also comprises the tuner pack 21 that is used for selecting from television broadcasting signal channel, so that selected channel is exported as shows signal.

Notice that video signal source 15 is not limited in this.For example, shown in Figure 15 (b), video signal source 15 exportable monitor video signals.In this case, it can be configured to: LCD monitor 30 not only comprises liquid crystal display 10, but also comprises monitor signal processing section 31, so that the video monitor signal is exported as vision signal.

Like this, according to the liquid crystal display 10 of an exemplary embodiment and the method that is used to drive liquid crystal display 10 of an exemplary embodiment, in the time will putting on each pixel corresponding to the voltage of data gray signal via source electrode line 8 in each frame at single frame, the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes appears.

Therefore, in an exemplary embodiment, lcd controller 14 is used for the input gray level value of conversion source driver 11 under positive polarity and negative polarity, thereby partly or entirely compensates this voltage drop, and the voltage that puts on source electrode line is set thus.

As a result, may provide: (i) lcd controller 14, and it can alleviate even avoid in adopting the situation that the time-division drives the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes; The (ii) driving method of this lcd controller 14.

In addition, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, lcd controller 14 setting puts on the voltage of source electrode line 8 so that compensation and the corresponding voltage drop of each positive voltage that puts on each pixel and with the corresponding voltage drop of each negative voltage that puts on each pixel.Thereby, in each frame according to the inverse voltage of counter electrode 4 alternately reversed polarity so that drive in the situation of each pixel, may provide: (i) liquid crystal display 10, and it can alleviate even avoid under each polarity the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes; The (ii) driving method of this liquid crystal display 10.

In addition, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, by using tracing table LUT, the lcd controller 14 exportable source electrode driver input gray level values that obtained by the input gray level value of converted image, thus may obtain to comprise the magnitude of voltage of voltage of the voltage drop that is used for the part even compensates each subframe fully.Therefore, be input to grey scale signal data value in the source electrode driver, may proofread and correct the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes by conversion under each polarity.

In addition, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, single frame is divided into two subframes by the time, thereby may apply the voltage that is used for minimum or the maximum or relative high-high brightness demonstration of relative minimum brightness demonstration at least one subframe.

In addition, according to the driving method of liquid crystal display 10 and liquid crystal display 10, in the subframe in two subframes apply voltage be used for minimum or relatively minimum brightness show the voltage that applies of maximum or relative high-high brightness demonstration.That is, in situation minimum or the maximum or relative high-high brightness demonstration of minimum brightness demonstration (black-level demonstration) (white level demonstration) relatively, the viewing angle characteristic of the display gray scale characteristic of the display panel 13 in liquid crystal display 10 is constant.Thereby, in single frame, carry out two or more operations of writing, and carry out write operation one of at least so that show minimum or the maximum or relative high-high brightness demonstration of minimum brightness (black-level demonstrations) (white level demonstration) relatively, improve viewing angle characteristic thus.

In addition, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, the voltage that applies in a subframe of two subframes is the voltage that applies that is used for minimum or relative minimum brightness demonstration or certain brightness demonstration.That is, in each frame, show minimum or minimum brightness or certain brightness relatively, and the demonstration that therefore obtains is similar to by the demonstration that pulsed drive obtained resemble CRT, thereby may improves the moving image display performance.

In addition, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, lcd controller 14 scans each bar of many gate lines 9 simultaneously, so that apply the voltage that is used for minimum or relative minimum brightness demonstration in a subframe of two subframes.In this case, many gate lines 9 are simultaneously selected, thus be used for minimum or relatively the voltage that shows of minimum brightness be applied simultaneously in a plurality of pixels, and apply the value of voltage must be identical.Indication depends on the mesomorphic state in other subframe and determines in the value that will be used for minimum or the voltage drop that caused by capacitor C gd of the voltage that shows of the minimum brightness process that puts on panel pixel relatively when selecting many gate lines 9, thereby can not be by partly even compensate each obtained voltage of this voltage drop fully and put on the pixel electrode of choosing simultaneously on the same source electrode line 8.Thereby, when selecting many gate lines 9, apply when subframe voltage is used for minimum or minimum brightness shows relatively, can not carry out this data-switching to come part by conversion source driver input gray level data even to compensate this voltage drop fully.

In one exemplary embodiment, in this state, be different from minimum or relatively minimum brightness show in another subframe of subframe (or after minimum brightness shows subframe relatively in the preceding subframe of second frame of appearance) at the minimum of first frame, will by add top in addition fully the obtained panel pixel of component of compensated voltage drop apply signal voltage be used for minimum or relatively minimum brightness show, thereby the mean value that puts on the voltage of liquid crystal in two frame periods becomes 0.

Promptly, select at the same time after the gate line 9, do not show the correction of carrying out in the subframe based on data-switching in minimum or relative minimum brightness, and the execution data-switching, thereby in another subframe (in the preceding subframe of second frame) output by add top in addition fully the obtained pixel of component of compensated voltage drop apply voltage.In this conversion, the mean value with regard to the part even the voltage of liquid crystal that differs from one another with regard to the component of compensated voltage drop, and put in two frames fully when voltage under the positive polarity and the voltage under the negative polarity are selected many gate lines 9 at the same time becomes 0.

For this reason, scan equally at the same time to apply in an every gate line 9 and the frame in two subframes and be used for the minimum or the relative situation of the voltage that shows of minimum brightness, can alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes.

In addition, the LCD TV 20 of an exemplary embodiment comprises liquid crystal display 10 and is used as the tuner pack 21 of the video signal source 15 of liquid crystal display 10 that this tuner pack 21 selects the channel of television broadcasting signals so that the television video frequency signal of institute's selected channel is exported as shows signal.

Therefore, may provide the LCD TV 20 that is provided with liquid crystal display 10, this liquid crystal display 10 can alleviate even avoid the influence by the caused voltage drop of gate-to-drain electric capacity of TFT element 6 in the situation that adopts the time-division driving.

In addition, the LCD monitor 30 of an exemplary embodiment comprises liquid crystal display 10 and is used as the monitor signal processing section 31 of the video signal source 15 of liquid crystal display 10 that the monitor signal of representing to be presented at the video in the liquid crystal display 10 is handled in this processing section 31, the monitor signal that also will handle is exported as vision signal.Thereby, a kind of LCD monitor 31 that is provided with liquid crystal display 10 may be provided, this liquid crystal display 10 can alleviate even avoid the influence by the caused voltage drop of gate-to-drain electric capacity of TFT element 6 in the situation that adopts the time-division driving.

[embodiment 2]

Below with reference to Fig. 6-7 another embodiment of the present invention is described.Notice that except the configuration of the following stated, an exemplary embodiment is provided with in the mode identical with embodiment 1.In addition, for convenience of description, give to have the element of identical function, and omit its explanation with the element of embodiment 1 with identical label.

In order to alleviate even to avoid in adopting the situation that the time-division drives influence by the caused voltage drop of gate-to-drain electric capacity of thin film transistor (TFT), in embodiment 1 under each polarity conversion source driver input gray level value.Yet each embodiment of the present invention is not limited to this solution.May improve even address the above problem by following configuration liquid crystal display: for example, driver be designed in the subframe of front and back input source driver input signal and output is arranged to corresponding to each subframe.

That is, this source electrode driver can be designed to: when positive polarity, negative polarity, f subframe and r subframe are set for input signal gray scale ki, and output

Vp＝Vp(ki，+，f)

Vp＝Vp(ki，+，r)

Vm＝Vm(ki，-，f)

Vm＝Vm(ki，-，r)。

At this, shown in Figure 17 (a) and 17 (b), usually the reference voltage generating circuit of source electrode driver receive the input data, just/negative polarity reverse signal and the input of front and back signal, and export two voltages that its value corresponds respectively to positive polarity and negative polarity.

Shown in Figure 17 (a) and 17 (b), reference voltage generating circuit receives 10 reference voltages from reference power source, and with resistor to each reference voltage dividing potential drop, so that obtain definite output voltage corresponding to gray scale output.Under each positive polarity and each negative polarity under this output voltage be 1 output.

Simultaneously, shown in Fig. 6 (a) and 6 (b), the resistor ladder circuit of the reference voltage generating circuit 16 in the source electrode driver 11 of an exemplary embodiment is configured to: a frame is divided into A subframe and B subframe, and the gradation data when gradation data when may a kind of gradation data being set to the output of A subframe and the output of B subframe.This operation realizes by the switch (not shown).Shown in Fig. 6 (a) and 6 (b), mutually the same in aspect A subframes such as division numbers, reference voltage and B subframe, but these values can change.

In addition, each embodiment of the present invention is not limited to these values.Notice that the resistor ladder circuit of the reference voltage generating circuit 16 shown in Fig. 6 (a) and 6 (b) is as first voltage generator element of at least one embodiment of the present invention.

Shown in Fig. 6 (a) and 6 (b), in this resistor ladder circuit, output voltage has two values under each polarity, and determines output according to subframe.For example, in the A subframe, resistor R nA (n is the natural number except that 0) is used to show the shadow tone gray scale.In the B subframe, resistor R nB (n is the natural number except that 0) is inserted into, thereby may export the voltage that its level is lower than level in the A subframe.

Promptly, in one exemplary embodiment, adopt one of them frame to divide carrying out the driving method that gray scale shows, and this configuration is based on and carry out on the hypothesis of output black in the subframe (minimum or minimum brightness) relatively or white (maximum or high-high brightness) relatively by the time.

Have the situation of the panel that allows not consider the driver that subframe is provided with output voltage for use, below describe explanation how output voltage is set.

At first, should determine the combination of gray scale output.In the pattern-driven situation of common maintenance, based on liquid crystal V-T characteristic (voltage-transmission characteristics), it is that 2.2 powers of a data value are proofreaied and correct to carry out γ that the output voltage of source electrode driver 11 is confirmed as transmissivity.Be divided and determine in the situation of output (especially as at least one embodiment of the present invention, in a subframe, showing in the situation of driving of black (minimum or minimum brightness) relatively or white (maximum or high-high brightness) relatively) according to the combination of subframe at a frame, transmissivity is relevant with the response characteristic of liquid crystal, thereby can determine magnitude of voltage according to following transmission characteristics: (i) relation between minimum or relative minimum transmittance voltage and a certain voltage; The (ii) maximum or relation between maximum transmission rate voltage and a certain voltage relatively.

In addition, even be used for exporting the minimum or the subframe of minimum brightness and maximum or relative high-high brightness relatively, should depend on that also the different voltage of the array output of gray scale is as output voltage.

An example of relation between input data gray scale shown in Figure 7 and output voltage are provided with.In Fig. 7, the voltage that under positive polarity, is provided with in the uppermost dotted line indication A subframe, the voltage that under positive polarity, is provided with in the top thick line indication B subframe, and the voltage that under negative polarity, is provided with in the following thick line indication B subframe, the voltage that under negative polarity, is provided with in the following dotted line indication A subframe.

By voltage is set in this way, the absolute value that puts on the voltage that puts on liquid crystal under absolute value and the negative polarity of voltage of liquid crystal under the positive polarity is identical, thereby does not have luminance difference in panel output.Promptly, different with the routine configuration corresponding to single gray scale input with two output voltages of 11 outputs of source electrode driver wherein (positive and negative), an exemplary embodiment is configured to: source electrode driver 11 outputs with double the as many output voltage of obtained number by a plurality of output groups that make the combination that comprises that subframe is exported.

Exemplary embodiment according to the driving method of the liquid crystal display 10 of an exemplary embodiment and liquid crystal display 10, a plurality of combinations of the output voltage of source electrode driver (preceding subframe voltage and back subframe voltage and positive polarity voltage and reverse voltage) are transformed into corresponding to image input gray level value, thereby may alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes.Like this, by using hardware also may alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by TFT element 6 causes.

[embodiment 3]

Followingly another embodiment of the present invention is described with reference to Figure 18-23.Notice that except the following stated was configured to, an exemplary embodiment was provided with in the mode identical with embodiment 1.In addition, for convenience of explanation, give to have the assembly of identical function with identical label, and the descriptions thereof are omitted with the assembly of embodiment 1.

In embodiment 2, reference voltage generating circuit 16 is prepared a plurality of combinations of the output voltage of the positive polarity in the positive polarity the subframe and negative polarity and back subframe and negative polarity before corresponding respectively in the gamut of 0 gray scale to 255 gray scale.

Simultaneously, an exemplary embodiment has been described the reference voltage generating circuit of wherein exporting a large amount of black (minimum or relative minimum brightness) voltage and a large amount of white (maximum or relative high-high brightness) voltage.Figure 18 illustrates the inner structure of 8 bit digital source electrode drivers.

At first, digital source driver 11 generally includes: data-latching circuit 41, sampling memory circuit 42, the reference voltage generating circuit 46 that keeps memory circuitry 43, DA converter 44, output circuit 45 and be used as second voltage generator element as shown in figure 18.

Notice that for convenience of description, in an exemplary embodiment, 9 bit data of each RGB all are input to source electrode driver 11.In addition, source electrode driver 11 is some counter-rotating source electrode drivers, and four reference voltages under the input positive polarity and four reference voltages under the negative polarity, promptly altogether 8 (=4 * 2) individual with reference to.In fact, the input number uses in each source electrode driver 11 different according to it.That is, in an exemplary embodiment of the present invention, the data of source electrode driver 11 inputs number (8) and to export number (RGB or be not) unrestricted.

The data of single line (8 * 3) were divided and are input to successively in the source electrode driver 11 by the time.In source electrode driver 11, by data-latching circuit 41 according to the temporary transient latch data of sampling clock, divide this data storage in sampling memory circuit 42 according to the time then, so that corresponding to according to the operation of starting impulse and clock from the shift-register circuit (not shown) of lcd controller 14 displacements.Then, according to horizontal-drive signal (not shown), data are passed to maintenance memory circuitry 43 together from lcd controller 14.

The reference voltage of this data based each grey level that has been produced by reference voltage generating circuit 46 converts analog voltage to by DA converter 44.

As mentioned above, reference voltage generating circuit 46 produces the magnitude of voltage of being changed by DA converter 44.In the resistor ladder circuit 46a of reference voltage generating circuit 46, as shown in figure 19, voltage carries out resistance according to the voltage as the input of reference voltage and divides.In addition, as voltage, produce the magnitude of voltage output (256 * 2 outputs altogether) of positive polarity and negative polarity corresponding to each gray scale.

Be relevant to the output voltage of input gray level data shown in Figure 20.

In general driving method, reverse signal is reversed in each frame, and pixel electrode alternately exports positive voltage (VH) and negative voltage (VL) to display panel 13 in each frame.Therefore, in that to carry out the grayscale voltage Vn that puts on liquid crystal when the n gray scale shows as follows:

Vn＝(VHn-VLn)/2

That is the potential difference (PD) between grayscale voltage Vn indication pixel electrode and the counter electrode.

In the source electrode driver 11 of an exemplary embodiment, as in embodiment 1 and embodiment 2, the polarity that puts on the voltage of pixel changes in each frame, and a frame period is divided into two or more period of sub-frame by the time, and carries out the gray scale intensities demonstration so that black (minimum or relative minimum brightness) or white (maximum or relative high-high brightness) show at least one subframe.

In addition, in the source electrode driver 11 of an exemplary embodiment, export a large amount of black (minimum or relative minimum brightness) voltage or a large amount of white (maximum or relative high-high brightness) voltage.Therefore, it is mutually the same to put on a large amount of output voltages of liquid crystal of pixel.

Notice that above exemplary embodiment has illustrated the situation that is generally black, but each embodiment of the present invention is not limited in this.At least one embodiment of the present invention is applicable to the situation that is generally white.In this case, white can be minimum or relative minimum brightness, and black can be maximum or relative high-high brightness.

Particularly, as shown in Figure 21, prepare 5 output voltages with respect to 0 gray scale and 255 gray scales in the input gray level data.Yet, if there is no need, can be only 0 gray scale one side or only at 255 gray scale one sides preparation output voltages.

In addition, output voltage (VH) dullness that is designed under positive polarity as source electrode driver above-mentioned shown in Figure 20, general rises and the dull decline of output voltage (VL) under negative polarity.Therefore, design according to general source electrode driver, shown in 0 gray scale of the input gray level data among Figure 21, can not obtain such output voltage: the output voltage under the positive polarity (VH) with identical dull decline of slope of output voltage (VL) under the negative polarity.

This be because: the resistance value that the resistor ladder circuit 46a of general reference voltage generating circuit 46 is configured under positive polarity and the negative polarity is mutually symmetrical.

That is, this is expressed by following equation.

RH(k)＝RL(k)

Wherein the resistance value under the positive polarity is represented (n is not less than 1 natural number) by RHn and resistance value under the negative polarity is represented (n is not less than 1 natural number) by RLn.Notice that k is the natural number in the 1-n scope.

Therefore, according to the configuration of resistor ladder circuit 46a, can not obtain such output voltage: identical at (VH) its slope under the positive polarity in 0 gray scale of input gray level data and 255 gray scales with slope under negative polarity.

Therefore, in an exemplary embodiment, the resistor ladder circuit 46b in 0 gray scale (black=minimum or relative minimum brightness) adopts configuration as shown in figure 22 and is used to retrieve the unique method of output voltage.

Promptly, as shown in Figure 22, in the 3rd resistor ladder circuit of the reference voltage generating circuit 46 that is used as a resistor ladder circuit 46b minimum or many output units of minimum brightness relatively and an exemplary embodiment, the reference voltage that is received is: reference voltage input VH0 and reference voltage input VH5; And reference voltage input VL0 and reference voltage input VL5.In addition, determine the output voltage that obtained by dividing reference voltage respectively according to resistance value RH1-RH5 and resistance value RL1-RL5.According to reference voltage VH0, VH5 and reference voltage VL0, VL5, output gray level voltage V0, V1, V2, V3, V4 and V5.

When this configuration was used for routine techniques, the voltage that puts on the pixel of liquid crystal panel 7 was as follows:

Vn＝(VHn-VLn)/2

On the other hand, in an exemplary embodiment, grayscale voltage VH0, VH1, VH2, VH3, VH4, VH5 and grayscale voltage VL0, VL1, VL2, VL3, VL4, VL5 are output as the output voltage of gray scale 0.

In this case, in an exemplary embodiment, output voltage is as follows:

V00＝(VH0-VL5)/2

V01＝(VH1-VL4)/2

V02＝(VH2-VL3)/2

V03＝(VH3-VL2)/2

V04＝(VH4-VL1)/2

V05＝(VH5-VL0)/2

Wherein, V00=V01=V02=V03=V04=V05.

In addition, the input tap voltage is as follows:

VH5-VH0＝VL0-VL5

Resistance value between the tap is as follows:

RH1＝RL5，RH2＝RL4，RH3＝RL3，RH4＝RL2，RH5＝RL1。

Resistance value is expressed by following equation.When under positive polarity, n resistor (n is not less than 2 natural number) being set between the input tap of first reference voltage and next reference voltage input tap and between the input tap of first reference voltage and next reference voltage input tap, n resistor being set under the negative polarity, and the resistance value of resistor is followed successively by RH (1) to RH (n) under the positive polarity, and when the resistance value of resistor is followed successively by RL (1) to RL (n) under the negative polarity

RH (k)=RL (n+1-k) (k is the natural number in the 1-n scope).

In addition, in the situation of output black in source electrode driver 11 (V00): (VH) output VH0 under positive polarity, and with lcd controller 14 control datas to export down VL5 in negative polarity (VL) or source electrode driver 11 to be configured to have the function of translation data.This condition is expressed as follows:

V00→VH0，VL5

In this case, other black (V01-V05) is expressed as follows equally:

V01→VH1，VL4

V02→VH2，VL3

V03→VH3，VL2

V04→VH4，VL1

V05→VH5，VL0

In addition, for these values, available lcd controller 14 comes control data, perhaps source electrode driver 11 can be configured to have the function that is used for translation data.

Above-mentioned relation is as described below.When under positive polarity, between the input tap of first reference voltage and next reference voltage input tap, n resistor (n is not less than 2 natural number) being set, and under negative polarity, between the input tap of first reference voltage and next reference voltage input tap, n resistor is set, the terminal voltage of resistor is followed successively by VH (0) to VH (n) under the positive polarity, and the terminal voltage of resistor is followed successively by VL (0) to VL (n) under the negative polarity, and VH (n)-VH (0)=VL (0)-VL (n), and under positive polarity output output voltage V H (k) and under negative polarity output output voltage V L (n+1-k).Notice that k is the natural number in the 0-n scope.

In addition, lcd controller 14 is come controlling and driving as same voltage output-controlling device, perhaps source electrode driver 11 is arranged to have the function that is used for translation data.

Then, Figure 23 illustrates the 4th resistor ladder circuit of the reference voltage generating circuit 46 of being used as of exemplary embodiment resistor ladder circuit 46c maximum or the many output units of high-high brightness relatively and 255 gray scales (white=maximum or relative high-high brightness) side.

As shown in Figure 23, received reference voltage is: reference voltage input VH250 and reference voltage input VH255; And reference voltage input VL250 and reference voltage input VL255.Determine by dividing the output voltage that the reference voltage input is obtained according to resistance value RH251-RH255 and resistance value RL251-RL255.According to reference voltage VH250, VH255 and reference voltage VL250, VL255, output gray level voltage V250, V251, V252, V253, V254 and V255.

When this configuration was used for routine techniques, the voltage that puts on liquid crystal panel 7 was as follows:

Vn＝(VHn-VLn)/2

On the other hand, in an example embodiment, grayscale voltage VH250, VH251, VH252, VH253, VH254, VH255 and grayscale voltage VL250, VL251, VL252, VL253, VL254, VL255 are exported as the output voltage of maximum or relative high-high brightness gray scale.

In this case, in an example embodiment, output voltage is as follows:

V255_0＝(VH250-VL255)/2

V255_1＝(VH251-VL254)/2

V255_2＝(VH252-VL253)/2

V255_3＝(VH253-VL252)/2

V255_4＝(VH254-VL251)/2

V255_5＝(VH255-VL250)/2

Wherein, VH255_0=VH255_1=VH255_2=VH255_3=VH255_4=VH255_5.

In addition, the input tap voltage is as follows:

VH255-VH250＝VL250-VL255

Resistance value between the tap is as follows:

RH251＝RL255，RH252＝RL254，RH253＝RL253，RH254＝RL252，RH255＝RL251。

Resistance value is expressed by following equation.When n resistor (n is not less than 2 natural number) being set between a reference voltage input tap in the end under positive polarity and the last reference voltage input tap and between a reference voltage input tap in the end under the negative polarity and last reference voltage input tap, n resistor being set, and the resistance value of resistor is followed successively by RH (max) to RH (max-n+1) under the positive polarity, and when the resistance value of resistor is followed successively by RL (max) to RL (max-n+1) under the negative polarity

RH (max+1-k)=RL (max-n+k) (k is the natural number in the 1-n scope).

In addition, in source electrode driver 11 in the situation of output white (V255): at positive polarity (VH) output VH250 down, and with lcd controller 14 control datas so that export VL255 down or source electrode driver 11 be configured to have the function that is used for translation data in negative polarity (VL).This condition is expressed as follows:

V255_0→VH250，VL255

In this case, other white (V255_1-V255_5) is expressed as follows equally:

V255_1→VH251，VL254

V255_2→VH252，VL253

V255_3→VH253，VL252

V255_4→VH254，VL251

V255_5→VH255，VL250

In addition,, should come control data, maybe source electrode driver 11 should be arranged to have the function that is used for translation data with lcd controller 14 for these values.

Above-mentioned relation is as follows.When n resistor (n is not less than 2 natural number) being set between a reference voltage input tap in the end under positive polarity and the last reference voltage input tap and between a reference voltage input tap in the end under the negative polarity and last reference voltage input tap, n resistor being set, and the terminal voltage of resistor is followed successively by VH (max) to VH (max-n) under the positive polarity, and the terminal voltage of resistor is followed successively by VL (max) to VL (max-n) under the negative polarity, and during VH (max)-VH (max-n)=VL (max-n)-VL (max), output output voltage V H (max-n+k) under positive polarity and under negative polarity output output voltage V L (max).Notice that max is the natural number of the ranks of last resistance of indication, and k is the natural number in the 0-n scope.

In addition, lcd controller 14 is come controlling and driving as same voltage output-controlling device, perhaps source electrode driver 11 is configured to have the function that is used for translation data.

Because these resistor ladder circuit 46b and 46c may prepare (maximum or relative high-high brightness) voltage of (minimum or relative minimum brightness) voltage output of a large amount of black or white and export.

Like this, according to the liquid crystal display 10 of an exemplary embodiment and the driving method of liquid crystal display 10, provide comprise following both or one of reference voltage generating circuit 46: resistor ladder circuit 46b, be used for and with regard to the potential difference (PD) between pixel electrode and the counter electrode, export pixel electrode to by mutually the same a plurality of output voltages, so that carry out minimum or minimum brightness demonstration relatively; With resistor ladder circuit 46c, be used for exporting a plurality of output voltages mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode to pixel electrode, so that carry out maximum or high-high brightness demonstration relatively.

Therefore, from minimum or relatively minimum brightness voltage or maximum or select the high-high brightness voltage relatively with other subframe in the corresponding minimum of output voltage or relative minimum brightness (black when being generally black) output voltage or maximum or relative high-high brightness (white when being generally black) output voltage, thereby possibility compensating pole sexual deviation.

In addition, in the liquid crystal indicator 10 of an exemplary embodiment, receive the image digitization gray-scale value and have relation by the expressed resistance value of RH (k)=RL (n+1-k) to produce resistor ladder circuit 46b corresponding to the output voltage of each polarity.The result, equally in the resistor ladder circuit, a plurality of voltages may be exported to pixel electrode to show minimum or relative minimum brightness, wherein each voltage is included in similar potential difference (PD) between pixel electrode and the counter electrode or even mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.In other words, may obtain a plurality of outputs so that to put on the voltage of liquid crystal of pixel mutually the same.

In addition, in the liquid crystal display 10 of an exemplary embodiment, carry out control, thereby: when terminal voltage is VH (n)-VH (0)=VL (0)-VL (n), output output voltage V H (k) under positive polarity and under negative polarity output output voltage V L (n+1-k), wherein n is that to be not less than 2 natural number and k be natural number in the 0-n scope.

For this reason, may export the combination of n+1 the voltage that differs from one another, wherein the potential difference (PD) between pixel electrode and the counter electrode is (VH (k)-VL (n+1-k))/2.

In addition, in the liquid crystal display 10 of an exemplary embodiment, receive the image digitization gray-scale value and have relation by the expressed resistance value of RH (max+1-k)=RL (max-n+k) to produce resistor ladder circuit 46c corresponding to the output voltage of each polarity.The result, equally in the resistor ladder circuit, a plurality of voltages may be exported to pixel electrode to show maximum or relative high-high brightness, wherein each voltage is included in similar potential difference (PD) between pixel electrode and the counter electrode or even mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.

In addition, in the liquid crystal display 10 of an exemplary embodiment, lcd controller 14 is carried out such control: when terminal voltage is VH (max)-VH (max-n)=VL (max-n)-VL (max), output output voltage V H (max-n+k) under positive polarity and under negative polarity output output voltage V L (max).

For this reason, may export n+1 the voltage combination that differs from one another, wherein the potential difference (PD) between pixel electrode and the counter electrode is (VH (max-n+k)-VL (max-k))/2.

In addition, the liquid crystal display 10 of an exemplary embodiment also can be used for LCD TV 20 described in the embodiment 1 and LCD monitor 30.

As mentioned above, the liquid crystal display of at least one embodiment of the present invention is configured to apply the voltage setting device voltage of positive polarity and negative polarity is put on data signal line, thereby so that according to the inverse voltage of the counter electrode in each frame alternately reversed polarity drive pixel, and will put on voltage drop and the voltage drop under the negative polarity that the voltage of data signal line is arranged under the positive polarity and obtain part even whole compensation.

In addition, the method that being used for of at least one embodiment of the present invention drives liquid crystal display comprises: thus with polarity be the voltage of positive and negative put on data signal line so that according to the inverse voltage of each frame counter electrode alternately reversed polarity drive pixel, and will put on voltage drop and the voltage drop under the negative polarity that the voltage of data signal line is arranged under the positive polarity and obtain part even whole compensation.

According at least one embodiment of the present invention, apply the setting of voltage setting device and put on the voltage of data signal line so that proofread and correct the voltage that puts on each pixel, this voltage is corresponding to voltage drop.Therefore, in according to each frame the inverse voltage of counter electrode alternately reversed polarity may provide: (i) alleviate even avoid depending on the influence of the voltage drop that its polarity causes with in the situation that drives pixel by the gate-to-drain capacitor of thin film transistor (TFT); And/or the (ii) driving method of liquid crystal display.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: apply the voltage setting device and comprise tracing table, thereby be used for exporting the value part of value by image input gray level value being converted to positive polarity and negative polarity or even all compensate the conversion gray-scale value that the voltage drop of each subframe obtains.

In addition, the method that is used for liquid crystal display of at least one embodiment of the present invention is configured to: tracing table is used for the conversion gray-scale value is inputed to data signal wire driving circuit partly even fully compensating the voltage drop of each subframe, and this conversion gray-scale value is by the value acquisition of value that image input gray level value is converted to positive polarity and negative polarity.

According at least one embodiment of the present invention, apply the voltage setting device and use tracing table will change gray-scale value to input to data signal line with part even compensate the voltage drop of each subframe fully, this conversion gray-scale value is by the value acquisition of value that image input gray level value is converted to positive polarity and negative polarity.Therefore, the memory storage such as tracing table is used to convert transition data value to the value of positive polarity and the value of negative polarity, thereby alleviates even avoid influence by the caused voltage drop of gate-to-drain electric capacity of thin film transistor (TFT).

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: apply the voltage setting device and comprise data signal wire driving circuit, and this data signal wire driving circuit comprises first voltage generator element that is provided with lower member: (i) be used for receiving the gradation of image value so that produce the first resistor ladder circuit that applies voltage corresponding to each polarity in a subframe; (ii) be used for producing by part even compensated voltage drop obtained fully the second resistor ladder circuit that applies voltage in the subframe that is different from this subframe.

In addition, the method that is used to drive liquid crystal display of at least one embodiment of the present invention is configured to: switch the output voltage of being arranged to correspond respectively to subframe and having been corresponded respectively to polarity by data signal wire driving circuit according to image input gray level value.

According at least one embodiment of the present invention, corresponding to the value of the source electrode driver output voltage of image input gray level value in preceding subframe positive polarity and the negative polarity in the preceding subframe between and change between positive polarity in the subframe of back and the negative polarity in the subframe of back, alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by thin film transistor (TFT) causes thus.Like this, also can be by export a plurality of voltages with data signal wire driving circuit, alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by thin film transistor (TFT) causes.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: single frame is divided at least two subframes by the time.

In addition, the method that is used to drive liquid crystal display of at least one embodiment of the present invention is configured to: single frame is divided at least two subframes by the time.

According to foregoing invention, single frame is divided at least two subframes by the time, thereby may apply the voltage that is used for minimum or the maximum or relative high-high brightness demonstration of relative minimum brightness demonstration at least one subframe.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: the voltage that applies at least one subframe of at least two subframes is used to carry out minimum or minimum brightness demonstration or maximum or high-high brightness demonstration relatively relatively.

In addition, the method that is used for driving liquid crystal display of at least one embodiment of the present invention is configured to: at least one subframe of at least two subframes apply voltage be used to carry out minimum or relatively minimum brightness show or maximum or relatively high-high brightness show.

According at least one embodiment of the present invention, the voltage that applies at least one subframe of at least two subframes is used to carry out minimum or minimum brightness demonstration or maximum or high-high brightness demonstration relatively relatively.That is, the visual angle of display panel is the wideest relatively in carrying out situation minimum or the maximum or relative high-high brightness demonstration of minimum brightness demonstration (black-level demonstration) (white level demonstration) relatively in the liquid crystal display.Therefore, in single frame, carry out two or more operations of writing, and two at least one of writing in the operation are write to operate and are implemented as minimum or minimum brightness demonstration (black-level demonstration) or maximum or high-high brightness demonstration (white level demonstration) relatively relatively, thereby improve viewing angle characteristic.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: apply the voltage that is used to carry out minimum or relative minimum brightness demonstration or a certain brightness demonstration at least in a subframe of two subframes.

In addition, the method that is used for driving liquid crystal display of at least one embodiment of the present invention is configured to: be used to carry out minimum or minimum brightness shows or a certain brightness shows relatively voltage and apply in a subframe of at least two subframes.

According at least one embodiment of the present invention, in a subframe of two subframes, apply the voltage that is used to carry out minimum or relative minimum brightness demonstration or a certain brightness demonstration at least.That is, show state is similar to such as the show state in the pulsed drive of CRT etc., and it alternately shows in each frame: (i) corresponding to the brightness of input signal brightness; (ii) minimum or minimum brightness or a certain brightness are relatively improved the moving image display performance thus.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: provide a kind of device, be used for apply be used for subframe carry out minimum or relatively minimum brightness show, or a certain brightness show voltage the time (for example apply voltage to many lines (scan signal line or data signal line) simultaneously, this device is operated according to the drive unit of being quoted among the Tokukai 2001-60078), and in other subframe, carry out be different from minimum or relatively minimum brightness show or a certain brightness gray-scale displayed brightness when showing, apply by part in addition compensate fully carry out minimum or relatively minimum brightness show or the voltage that voltage drop obtained of a certain brightness when showing.

In addition, the method that being used for of at least one embodiment of the present invention drives liquid crystal display is configured to: apply be used for a subframe carry out minimum or relatively minimum brightness show, or a certain brightness show voltage the time apply voltage to many lines (scan signal line or data signal line) simultaneously, and execution is different from minimum or minimum brightness demonstration relatively in other subframe, or a certain brightness gray-scale displayed brightness is when showing, apply by part in addition compensate fully carry out minimum or relatively minimum brightness show or the voltage that voltage drop obtained of a certain brightness when showing.

According at least one embodiment of the present invention, apply and apply the voltage that is used for minimum or relative minimum brightness demonstration in the subframe of voltage setting device at least two subframes, thereby in single frame, apply voltage to many lines (scan signal line or data signal line).In this case, the voltage that will be used for minimum or minimum brightness demonstration relatively puts on a plurality of pixels simultaneously, thereby the value of each voltage must be mutually the same.And the output brightness in pixel is in other subframe in the different situation, indication apply be used for minimum or relatively minimum brightness show voltage the time the value difference of voltage drop.Therefore, next part of impossible voltage even compensated voltage drop fully with minimum or relative minimum brightness demonstration.

According at least one embodiment of the present invention, in order to alleviate even to address this is that, be different from minimum or relatively minimum brightness show in another subframe of subframe (or after minimum brightness shows subframe relatively in the preceding subframe of second frame of appearance) at the minimum of first subframe, applying signal voltage by the panel pixel that component obtained that adds part even whole compensated voltage drops is output, be used for minimum or minimum brightness demonstration relatively, thereby the mean value that puts on the voltage of liquid crystal in two frame periods becomes 0.Promptly, select at the same time after the gate line 9 minimum or relatively minimum brightness show and do not carry out in the subframe based on the correction of data-switching but carry out data-switching, thereby in another subframe (in the preceding subframe at second frame) output by add partly in addition fully the pixel that component obtained of compensated voltage drop apply voltage.

Owing to this reason, even scan the multi-strip scanning line at the same time, also can alleviate even avoid the influence of the voltage drop that the gate-to-drain electric capacity by thin film transistor (TFT) causes so that in a subframe of at least two subframes, apply and be used for minimum or relatively under the situation of the voltage that shows of minimum brightness.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: second voltage generator element minimum or relatively the many output units of minimum brightness have and be used to receive the view data gray-scale value to produce separately the 3rd resistor ladder circuit corresponding to a plurality of output voltages of each polarity, and the 3rd resistor ladder circuit has n the resistor that is provided with under the positive polarity between the input tap of first reference voltage and next reference voltage input tap, and n the resistor that between the input tap of first reference voltage and next reference voltage input tap, is provided with under the negative polarity, and under the positive polarity resistance value of resistor be followed successively by RH (1) to RH (n) and under the negative polarity resistance value of resistor be followed successively by RL (1) to RL (n), and the relation of resistance value is expressed by following equation:

RH(k)＝RL(n+1-k)

Wherein n is not less than 2 natural number and k is the natural number in the 1-n scope.

According at least one embodiment of the present invention, has the resistance value of expressing by RH (k)=RL (n+1-k) with the 3rd resistor ladder circuit minimum or a plurality of output units of minimum brightness relatively that applies voltage that produces corresponding to each polarity as receiving the view data gray-scale value.The result, this resistor ladder circuit can also export a plurality of voltages to pixel electrode to carry out minimum or minimum brightness demonstration relatively, and wherein these a plurality of voltages outputs comprise the similar phase differential between pixel electrode and the counter electrode separately even are mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: the minimum or relative a plurality of output units of minimum brightness have identical voltage output-controlling device, be used to make the 3rd resistor ladder circuit retrieves to put on the output voltage of pixel electrode, wherein these a plurality of output voltages are included in the similar phase differential between pixel electrode and the counter electrode separately, even it is mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode, and this identical voltage output-controlling device is carried out such control: the terminal voltage of n resistor is followed successively by VH (0) to VH (n) under positive polarity, and when the terminal voltage of n resistor is followed successively by VL (0) to VL (n) and VH (n)-VH (0)=VL (0)-VL (n) under the negative polarity, output voltage V H (k) exports under positive polarity and output voltage V L (n+1-k) exports under negative polarity, and wherein n is not less than 2 natural number and k is the natural number in the 0-n scope.

According at least one embodiment of the present invention, identical voltage output-controlling device is carried out such control: when VH (n)-VH (0)=VL (0)-VL (n), and output voltage V H (k) (k is the natural number in the 0-n scope) output and output voltage V L (n+1-k) exports under negative polarity under positive polarity.

Owing to this reason, may export n+1 the voltage combination that differs from one another, in these combinations, the potential difference (PD) between pixel electrode and the counter electrode is (VH (k)-VL (n+1-k))/2.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: second voltage generator element maximum or relatively a plurality of output units of high-high brightness have and receive the image digitization gray-scale value to produce separately the 4th resistor ladder circuit corresponding to the output voltage of each polarity, and the 4th resistor ladder circuit has under the negative polarity n the resistor that is provided with between a reference voltage input tap in the end and the last reference voltage input tap, and n the resistor that is provided with between reference voltage input tap in the end and the last reference voltage input tap under the negative polarity, and the resistance value of resistor is followed successively by RH (max) to RH (max-n+1) under positive polarity, and the resistance value of resistor is followed successively by RL (max) to RL (max-n+1) under negative polarity, and the relation between the resistance value is expressed by following equation:

RH(max+1-k)＝RL(max-n+k)

Wherein n is not less than 2 natural number and k is the natural number in the 1-n scope.

According at least one embodiment of the present invention, have by RH (max+1-k)=expressed resistance value of RL (max-n+k) with the 4th resistor ladder circuit maximum or the many output units of high-high brightness relatively that produces separately corresponding to the output voltage of each polarity as receiving the image digitization gray-scale value.The result, this resistor ladder circuit can also export a plurality of voltages to pixel electrode to carry out maximum or high-high brightness demonstration relatively, these a plurality of voltages are included in the approximate potential difference (PD) between pixel electrode and the counter electrode separately, even mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.

In addition, the liquid crystal display of at least one embodiment of the present invention is configured to: the maximum or relative a plurality of output units of high-high brightness have identical voltage output-controlling device, be used to make the 4th resistor ladder circuit retrieves to put on the mutually the same brightness output voltage with regard to the potential difference (PD) between pixel electrode and the counter electrode of pixel electrode, and this identical voltage output-controlling device is carried out such control: the terminal voltage of n resistor is followed successively by VH (max) to VH (max-n) under positive polarity, and when the terminal voltage of n resistor is followed successively by VL (max) to VL (max-n) and VH (max)-VH (max-n)=VL (max-n)-VL (max) under the negative polarity, output voltage V H (max-n+k) exports under positive polarity, and output voltage V L (max) exports under negative polarity, wherein n is not less than 2 natural number, and max is the natural number of ranks of last resistor of indication and k is the natural number in the 0-n scope.

According at least one embodiment of the present invention, identical voltage output-controlling device is carried out such control: when VH (max)-VH (max-n)=VL (max-n)-VL (max), output voltage V H (max-n+k) exports under positive polarity and output voltage V L (max) exports under negative polarity.

Owing to this reason, may export n+1 the voltage combination that differs from one another, the potential difference (PD) between pixel electrode and the counter electrode is (VH (max-n+k)-VL (max-k))/2 in these combinations.

Describe the present invention like this, it is conspicuous that same mode can change with many modes.These variations are not regarded as deviating from the spirit and scope of the present invention, and all these can be that conspicuous modification is intended to be included in the scope of following claims for those skilled in the art.

Industrial applicibility

The display device of at least one embodiment of the present invention and the driving method of at least one embodiment of the present invention can be used in the active matrix liquid crystal display device.In addition, this display device and driving method can also be used for being equipped with separately the LCD TV and the LCD monitor of active matrix liquid crystal display device.

Claims (79)

1. liquid crystal display, be used for by corresponding switching device to each of a plurality of pixels carry out via the time partial image the gray scale of subframe show that described liquid crystal display comprises:

Apply voltage device is set, be suitable for to put on based on the magnitude of voltage setting of last subframe at least in part the voltage of each respective pixel, so that compensate the voltage drop of each the respective switch device that causes by electric capacity at least in part.

2. liquid crystal display as claimed in claim 1, it is characterized in that, describedly apply the voltage setting device to be suitable for polarity be the data signal line that the voltage of positive and negative puts on described display device, thereby reversed polarity drives pixel to come alternately according to the inverse voltage of counter electrode in each frame, and be suitable for being provided with the voltage that puts on data signal line, thereby voltage drop under the positive polarity and the voltage drop under the negative polarity are compensated at least in part.

3. liquid crystal display as claimed in claim 1, it is characterized in that, the described voltage setting device that applies comprises tracing table, is used for exporting by image input gray level value being converted to value under the positive polarity and the value under the negative polarity to compensate the conversion gray-scale value that voltage drop was obtained of each subframe at least in part.

4. liquid crystal display as claimed in claim 2, it is characterized in that, the described voltage setting device that applies comprises data signal wire driving circuit, and wherein said data signal wire driving circuit comprises first voltage generator element, and described first voltage generator element comprises:

The first resistor ladder circuit is suitable for receiving gradation of image value in the subframe producing the voltage that applies corresponding to each polarity, and

The second resistor ladder circuit, be suitable for producing by compensation at least in part be different from the subframe of described subframe voltage drop obtained applies voltage.

5. liquid crystal display as claimed in claim 3, it is characterized in that, the described voltage setting device that applies comprises data signal wire driving circuit, and wherein said data signal wire driving circuit comprises first voltage generator element, and described first voltage generator element comprises:

The first resistor ladder circuit is suitable for receiving gradation of image value in the subframe producing the voltage that applies corresponding to each polarity, and

The second resistor ladder circuit, be suitable for producing by compensation at least in part be different from the subframe of described subframe voltage drop obtained applies voltage.

6. liquid crystal display as claimed in claim 1, it is characterized in that, described respective switch device is corresponding thin film transistor (TFT), and wherein said voltage drop is based on the gate-to-drain electric capacity of described thin film transistor (TFT), and described voltage drop is that the combination by the voltage of the data gray signal in each subframe causes.

7. liquid crystal display as claimed in claim 1 is characterized in that, a frame of image is divided at least two subframes by the time.

8. liquid crystal display as claimed in claim 7, it is characterized in that, at least one subframe of described at least two subframes apply voltage be used to carry out that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness shows one of at least.

9. liquid crystal display as claimed in claim 7 is characterized in that, the described voltage setting device that applies comprises tracing table.

10. liquid crystal display as claimed in claim 1 is characterized in that, in described at least one subframe apply voltage be used to carry out that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness shows one of at least.

11. liquid crystal display as claimed in claim 7 is characterized in that, applies the voltage one of at least that is used to obtain minimum and relative minimum brightness at least in a subframe of described two subframes.

12. liquid crystal display as claimed in claim 7 is characterized in that, applies the voltage one of at least that is used to obtain maximum and relative high-high brightness at least in a subframe of described two subframes.

13. liquid crystal display as claimed in claim 11 is characterized in that, also comprises:

Be used for the device that is used for when subframe is carried out the minimum relatively or minimum voltage that shows, simultaneously voltage being put on many lines applying, and wherein be different from the voltage that voltage drop obtained that applies when minimum relatively at least one other subframe or the brightness of minimum brightness gray-scale displayed show when carrying out minimum relatively or minimum brightness and show by compensation at least in part in execution.

14. liquid crystal display as claimed in claim 12 is characterized in that, also comprises:

Be used for the device that is used for when subframe is carried out the maximum relatively or maximum voltage that shows, simultaneously voltage being put on many lines applying, and wherein be different from the voltage that voltage drop obtained that applies when maximum relatively at least one other subframe or the brightness of high-high brightness gray-scale displayed show when carrying out maximum relatively or high-high brightness and show by compensation at least in part in execution.

15. one kind be used for driving liquid crystal display by corresponding switching device to each of a plurality of pixels carry out via the time partial image the gray scale of subframe show that described method comprises:

To put on the voltage of each respective pixel at least in part based on the magnitude of voltage setting of last subframe, to compensate the voltage drop of each the respective switch device that causes by electric capacity at least in part.

16. method as claimed in claim 15, it is characterized in that, with polarity is that the voltage of positive and negative puts on described data signal line, thereby coming alternately reversed polarity to drive pixel according to the inverse voltage of counter electrode in each frame, and the wherein said voltage that puts on data signal line is configured to voltage drop under the positive polarity and the voltage drop under the negative polarity is compensated at least in part.

17. method as claimed in claim 15, it is characterized in that, tracing table is used to the conversion gray-scale value is inputed to the data-signal driving circuit compensating the voltage drop in each subframe at least in part, and described conversion gray-scale value obtains by image input gray level value being converted to value under the positive polarity and the value under the negative polarity.

18. method as claimed in claim 15 is characterized in that, switches the output voltage that is configured to correspond respectively to subframe and corresponds respectively to polarity according to image input gray level value.

19. method as claimed in claim 15 is characterized in that, single frame is divided at least two subframes by the time.

20. method as claimed in claim 15, it is characterized in that, described at least one subframes of at least two subframes apply voltage be used to carry out that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness shows one of at least.

21. method as claimed in claim 19 is characterized in that, the described voltage setting device that applies comprises tracing table.

22. method as claimed in claim 15 is characterized in that, described at least one subframe apply voltage be used to carry out that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness shows one of at least.

23. method as claimed in claim 19 is characterized in that, applies the voltage one of at least that is used to obtain minimum and relative minimum brightness at least in a subframe of two subframes.

24. method as claimed in claim 19 is characterized in that, applies the voltage one of at least that is used to obtain maximum and relative high-high brightness at least in a subframe of two subframes.

25. method as claimed in claim 23 is characterized in that, also comprises:

Be used for when subframe is carried out the minimum relatively or minimum voltage that shows, simultaneously voltage being put on many lines applying, and wherein when execution is different from minimum relatively at least one other subframe or the brightness of minimum brightness gray-scale displayed and shows, apply the voltage that voltage drop obtained when carrying out minimum relatively or minimum brightness and show by compensation at least in part.

26. method as claimed in claim 24 is characterized in that, also comprises:

Be used for when subframe is carried out the maximum relatively or maximum voltage that shows, simultaneously voltage being put on many lines applying, and wherein when execution is different from maximum relatively at least one other subframe or the brightness of high-high brightness gray-scale displayed and shows, apply the voltage that voltage drop obtained when carrying out maximum relatively or high-high brightness and show by compensation at least in part.

27. liquid crystal display, be fit to based in each frame period of image, exporting the output voltage of pixel electrode to and putting on the potential difference (PD) between the voltage of counter electrode and change polarity, to the frame period be divided into two or more period of sub-frame by the time shows to carry out brightness, thereby carry out at least one period of sub-frame that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show or high-high brightness shows one of at least, described liquid crystal display comprises:

Voltage generator element, described voltage generator element comprise following one or more:

The a plurality of outputs of first brightness, be suitable for a plurality of output voltages export to pixel electrode with carry out that relative minimum brightness and minimum brightness show one of at least, described each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; And

The a plurality of outputs of second brightness, be suitable for a plurality of output voltages export to pixel electrode with carry out that relative high-high brightness and high-high brightness show one of at least, described each output voltage is included in the similar potential difference (PD) between pixel electrode and the counter electrode.

28. liquid crystal display as claimed in claim 27 is characterized in that, a plurality of output voltages one of at least of a plurality of output units of described first and second brightness are mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.

29. liquid crystal display as claimed in claim 27; It is characterized in that; The a plurality of output devices of described the first brightness comprise for receiving the image digitization gray value to produce separately the resistor ladder circuit corresponding to a plurality of output voltages of each polarity; Described resistor ladder circuit comprises under the positive polarity under n the resistor that arranges between the input tap of the first reference voltage and next reference voltage input tap and negative polarity inputs n the resistor that arranges between the tap in the input tap of the first reference voltage and next reference voltage

Wherein the resistance value of resistor is followed successively by RH (1) to RH (n) under the positive polarity, and the resistance value of resistor is followed successively by RL (1) to RL (n) under the negative polarity, and

The relation of wherein said resistance value is expressed as:

RH(k)＝RL(n+1-k)

Wherein, n is not less than 2 natural number and k is the natural number in 1 to the n scope.

30. liquid crystal display as claimed in claim 29 is characterized in that,

The a plurality of output units of described first brightness comprise identical voltage output-controlling device, be used to make described resistor ladder circuit retrieves to put on pixel electrode, mutually the same output voltage with regard to the potential difference (PD) between pixel electrode and counter electrode, and described identical voltage output-controlling device is carried out such control: the terminal voltage of n resistor is followed successively by VH (0) to VH (n) under positive polarity, and when the terminal voltage of n resistor is followed successively by VL (0) to VL (n) and VH (n)-VH (0)=VL (0)-VL (n) under the negative polarity, output voltage V H (k) exports under positive polarity and output voltage V L (n+1-k) exports under negative polarity, and wherein n is not less than 2 natural number and k is the natural number in 0 to the n scope.

31. liquid crystal display as claimed in claim 29 is characterized in that, a plurality of output units of described second brightness comprise:

The second resistor ladder circuit is used to receive the image digitization gray-scale value producing separately the output voltage corresponding to each polarity,

The wherein said second resistor ladder circuit has under the positive polarity under n resistor being provided with between a reference voltage input tap in the end and the last reference voltage input tap and the negative polarity reference voltage input tap in the end and last reference voltage and imports n the resistor that is provided with between the tap

Wherein the resistance value of resistor is followed successively by RH (max) to RH (max-n+1) under the positive polarity, and the resistance value of resistor is followed successively by RL (max) to RL (max-n+1) under the negative polarity,

The relation of wherein said resistance value is expressed by following equation:

RH(max+1-k)＝RL(max-n+k)

Wherein, n is not less than 2 natural number and k is the natural number in 1 to the n scope.

32. liquid crystal display as claimed in claim 31, it is characterized in that, the a plurality of output units of described second brightness comprise identical voltage output-controlling device, be used to make the described second resistor ladder circuit retrieves to put on the mutually the same brightness output voltage with regard to the potential difference (PD) between pixel electrode and the counter electrode of pixel electrode, and described identical voltage output-controlling device is carried out such control: the terminal voltage of n resistor is followed successively by VH (max) to VH (max-n) under positive polarity, and when the terminal voltage of n resistor is followed successively by VL (max) to VL (max-n) and VH (max)-VH (max-n)=VL (max-n)-VL (max) under the negative polarity, output voltage V H (max-n+k) exports under positive polarity and output voltage V L (max) exports under negative polarity, wherein n is not less than 2 natural number, max be the indication last resistor ranks natural number and k is the natural number in 0 to the n scope.

33. method that is used to drive liquid crystal display, it is characterized in that, in each frame period of image, polarity is based on exporting the output voltage of pixel electrode to and be applied to the potential difference (PD) between the voltage on the counter electrode and change in each frame, the described frame period is divided into two or more period of sub-frame by the time and shows to carry out brightness, thereby carry out at least one period of sub-frame that relative minimum brightness shows, minimum brightness shows, relatively high-high brightness show and high-high brightness shows one of at least, described method comprises:

Export a plurality of first output voltages to pixel electrode, with carry out that relative minimum brightness shows and the minimum brightness demonstration one of at least, described each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode; And

Export a plurality of output voltages to pixel electrode, with carry out that relative high-high brightness shows and the high-high brightness demonstration one of at least, described each output voltage comprises the similar potential difference (PD) between pixel electrode and the counter electrode.

34. method as claimed in claim 33 is characterized in that, described a plurality of first and second output voltages one of at least mutually the same with regard to the potential difference (PD) between pixel electrode and the counter electrode.

35. a LCD TV comprises:

Liquid crystal display as claimed in claim 1; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

36. a LCD TV comprises:

Liquid crystal display as claimed in claim 27; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

37. a LCD monitor comprises:

Liquid crystal display as claimed in claim 1; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

38. a LCD monitor comprises:

Liquid crystal display as claimed in claim 27; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

39. a LCD TV comprises:

Liquid crystal display as claimed in claim 2; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

40. a LCD TV comprises:

Liquid crystal display as claimed in claim 28; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

41. a LCD monitor comprises:

Liquid crystal display as claimed in claim 2; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

42. a LCD monitor comprises:

Liquid crystal display as claimed in claim 28; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

43. a LCD TV comprises:

Liquid crystal display as claimed in claim 3; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

44. a LCD monitor comprises:

Liquid crystal display as claimed in claim 3; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

45. one kind be used for by corresponding switching device to each of a plurality of pixels carry out via the time partial image the liquid crystal display that shows of the gray scale of subframe, comprising:

Be used for to put on the voltage of each respective pixel based on the magnitude of voltage setting of last subframe, with the device of the voltage drop that compensates each the respective switch device that causes by electric capacity at least in part to small part; And

Be used to apply the device of described voltage.

46. liquid crystal display as claimed in claim 45, it is characterized in that, the described device that is used for applying is used for according to the inverse voltage of each frame counter electrode thereby polarity being the voltage of the positive and negative signal wire that puts on described display device, driving pixel with reversed polarity alternately, and the described device that is used to be provided with is used to be provided with the voltage that puts on described data signal line, to compensate voltage drop under the positive polarity and the voltage drop under the negative polarity at least in part.

47. liquid crystal display as claimed in claim 45, it is characterized in that, the described device that is used to be provided with comprises tracing table, is used for exporting by image input gray level value being converted to value under the positive polarity and the value under the negative polarity to compensate the conversion gray-scale value that voltage drop was obtained of each subframe at least in part.

48. a LCD TV comprises:

Liquid crystal display as claimed in claim 45; And

Be used as the tuner pack of the video signal source of described liquid crystal display, described tuner pack is selected the channel of television broadcasting signal and the television video frequency signal of institute's selected channel is exported as shows signal.

49. a LCD monitor comprises:

Liquid crystal display as claimed in claim 45; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

50. one kind is used for driving liquid crystal display and carries out the method that each gray scale of a plurality of pixels shows, described method comprises:

Image is divided into a plurality of subframes by the time;

The bucking voltage of each respective pixel is set based on the magnitude of voltage of last subframe at least in part; And

Set voltage is put on each respective pixel.

51. method as claimed in claim 50, it is characterized in that, thereby polarity is the voltage of positive and negative to be put on the signal wire with reversed polarity alternately according to the inverse voltage of counter electrode in each frame and drives pixel, and the voltage that puts on described data signal line is configured to compensate at least in part voltage drop under the positive polarity and the voltage drop under the negative polarity.

52. method as claimed in claim 51, it is characterized in that, tracing table is used for being input to data signal wire driving circuit by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

53. method as claimed in claim 52, it is characterized in that, tracing table is used for being input to data signal wire driving circuit by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

54. method as claimed in claim 50, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that wherein puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

55. method as claimed in claim 51, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that wherein puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

56. method as claimed in claim 52, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that wherein puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

57. method as claimed in claim 53, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that wherein puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

58. one kind is used for driving liquid crystal display and shows that with each the gradation of image of carrying out a plurality of pixels each frame of described image all is divided into a plurality of subframes by the time, described method comprises:

The bucking voltage of each respective pixel is set based on the magnitude of voltage of last subframe at least in part; And

Set voltage is put on each respective pixel.

59. method as claimed in claim 58, it is characterized in that, thereby polarity is the voltage of positive and negative to be put on the signal wire with reversed polarity alternately according to the inverse voltage of counter electrode in each frame and drives pixel, and the voltage that puts on described data signal line is configured to compensate at least in part voltage drop under the positive polarity and the voltage drop under the negative polarity.

60. method as claimed in claim 58, it is characterized in that, tracing table is used for being input to data signal wire driving circuit by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

61. method as claimed in claim 59, it is characterized in that, tracing table is used for being input to data signal wire driving circuit by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

62. method as claimed in claim 58, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that wherein puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

63. the liquid crystal display that each the gray scale that is used for carrying out a plurality of pixels shows, each two field picture all is divided into a plurality of subframes by the time, and described display device comprises:

Controller is suitable for being provided with based on the magnitude of voltage of last subframe at least in part the bucking voltage of each respective pixel; And

Driving circuit is suitable for set voltage is put on each respective pixel.

64. as the described display device of claim 63, it is characterized in that, thereby polarity is the voltage of positive and negative to be put on the signal wire with reversed polarity alternately according to the inverse voltage of counter electrode in each frame and drives pixel, and the voltage that puts on described data signal line is configured to compensate at least in part voltage drop under the positive polarity and the voltage drop under the negative polarity.

65. as the described display device of claim 63, it is characterized in that, also comprise:

Tracing table, being used for data signal line to driving circuit provides the conversion gray-scale value compensating the voltage drop of each subframe at least in part, and described conversion gray-scale value obtains by image input gray level value being converted to value under the positive polarity and the value under the negative polarity.

66. as the described display device of claim 64, it is characterized in that, also comprise:

Tracing table, being used for data signal line to driving circuit provides the conversion gray-scale value compensating the voltage drop of each subframe at least in part, and described conversion gray-scale value obtains by image input gray level value being converted to value under the positive polarity and the value under the negative polarity.

67. as the described display device of claim 63, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

68. as the described display device of claim 64, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

69. as the described display device of claim 65, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

70. as the described display device of claim 66, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

71. a LCD TV comprises:

As the described liquid crystal display of claim 63; And

Be used as the tuner pack of the video signal source of described liquid crystal display, channel of its selection television broadcasting signal and the general television video frequency signal of selected channel export as shows signal.

72. a LCD monitor comprises:

As the described liquid crystal display of claim 63; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

73. the liquid crystal display that each the gray scale that is used for carrying out a plurality of pixels shows, each two field picture all is divided into a plurality of subframes by the time, and described display device comprises:

Be used for being provided with based on the magnitude of voltage of last subframe at least in part the device of the bucking voltage of each respective pixel; And

Be used for set voltage is put on the device of each respective pixel.

74. as the described display device of claim 73, it is characterized in that, thereby polarity is the voltage of positive and negative to be put on signal wire according to the inverse voltage of counter electrode in each frame and drives pixel with reversed polarity alternately, and the voltage that puts on described data signal line is configured to compensate at least in part voltage drop under the positive polarity and the voltage drop under the negative polarity.

75. as the described display device of claim 73, it is characterized in that, the described device that is used to be provided with comprises tracing table, being used for data signal line to driving circuit provides by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

76. as the described display device of claim 74, it is characterized in that, tracing table is used for being input to data signal wire driving circuit by image input gray level value being converted to value under the positive polarity and the conversion gray-scale value that value obtained under the negative polarity, to compensate the voltage drop in each subframe at least in part.

77. as the described display device of claim 73, it is characterized in that, in a plurality of pixels each comprises corresponding switching device, and the voltage that puts on each respective pixel is configured to compensate at least in part the voltage drop of each the respective switch device that is caused by electric capacity.

78. a LCD TV comprises:

As the described liquid crystal display of claim 73; And

As the tuner pack of the video signal source of described liquid crystal display, its select television broadcasting signal channel, and the television video frequency signal of selected channel export as shows signal.

79. a LCD monitor comprises:

As the described liquid crystal display of claim 73; And

As the monitor signal processing section of the video signal source of described liquid crystal display, its is handled the monitor signal that should show, and treated described monitor signal is exported as vision signal in described liquid crystal display.

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