JP4703001B2 - Driving method of liquid crystal display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for driving a liquid crystal display device.
[0002]
[Prior art]
A. P. FIG. 6 shows a configuration example of a two-screen division type simple matrix type liquid crystal display device driven by the (Alt Plesko) method.
[0003]
According to the figure, a scanning side substrate in which scanning electrode patterns and an alignment film arranged in one direction are sequentially stacked, and a signal electrode pattern and an alignment film arranged in the other direction and divided at the central portion thereof. The signal-side substrates that are sequentially stacked face each other across the liquid crystal layer, and both electrode patterns intersect to form a rectangular display area, and the upper and lower two-screen split type with the total number of scanning electrodes being 2n Liquid crystal panel 1, upper screen scan electrode drive circuit 2 for driving scan electrodes on the upper screen, lower screen scan electrode drive circuit 3 for driving scan electrodes on the lower screen, and upper screen for driving signal electrodes on the upper screen The signal electrode drive circuit 4, the lower screen signal electrode drive circuit 5 that drives the signal electrodes on the lower screen, and the drive power supply circuit 6 that generates a predetermined voltage for driving the liquid crystal panel 1.
[0004]
The scanning start signal FRM, the scanning clock LP and the data latch pulse LP, the alternating signal DF, the data shift clock CP, the display data, and the display signal DISP which are control signals are supplied from the outside.
[0005]
The drive power supply circuit 6 includes scan electrode selection voltages VH and VL and non-selection voltage VM for the scan electrode drive circuit 3, and V0 corresponding to ON / OFF of signal electrode display for the signal electrode drive circuits 4 and 5. V1 and the intermediate voltage VM are supplied. The non-selection voltage VM and the intermediate voltage VM are the same voltage.
[0006]
Next, the operation of the driving circuit when the liquid crystal display device displays as shown in FIG. 6 will be described with reference to FIGS. FIG. 7 shows the timing of the control signal, and FIG. 8 shows the ideal waveform of the operation.
[0007]
After the rising edge of the scanning start signal FRM is input, the scanning electrode driving circuit 3 on each of the upper and lower screens applies a selection voltage to the first scanning electrodes X1 and X1 ′ of each screen in synchronization with the falling edge of the first scanning clock (this) (Referred to as “selection”). The selection voltage is either the voltage VH or the voltage VL according to the alternating signal DF.
[0008]
At the same time, the signal electrode drive circuit outputs one of the voltages V0 and V1 to all the electrodes Y1 to Ym according to the contents of the display data taken in and the AC signal DF, and at the same time, the next display data is data. Capture in synchronization with the shift clock CP.
[0009]
The outputs of the scan electrode drive circuit and the signal electrode drive circuit are maintained for a period until the next fall of the scan clock LP, and when the next scan clock is input, the scan electrodes X2 and X2 'are selected. The signal electrode driving circuit outputs one of the voltages V0 and V1 to all the electrodes Y1 to Ym according to the contents of the display data taken in, and then sequentially X3 and X3 ′,... Xi and Xi ′. Are selected in order. The non-selection voltage VM is applied to the other scan electrodes that are not selected.
[0010]
Then, after selecting the last scan electrodes Xn and Xn ′ of each screen, when the scan start signal FRM is inputted, the operation of sequentially selecting again from the top scan electrode of each screen is repeated. . A period from when the scanning start signal FRM is input until the next scanning start signal FRM is input is referred to as a frame period.
[0011]
When the display signal DISP is not input, the outputs of the scan electrode drive circuit and the signal electrode drive circuit are forcibly fixed to the voltage VM, but the other internal operations of the scan electrode drive circuit and the signal electrode drive circuit Is performed regardless of the presence or absence of the display signal DISP.
[0012]
From the above operation, the ideal waveform during operation of the drive circuit when the pixels on the Yj line are displayed with black circles and white circles as shown in FIG. 6 is as shown in FIG.
[0013]
[Problems to be solved by the invention]
However, since the liquid crystal panel 1 is equivalently represented by an RC distributed constant circuit composed of an ITO electrode and a liquid crystal capacitor, the actual drive waveform is distorted or rounded.
[0014]
In recent years, a simple matrix type liquid crystal display device has been proposed in which a semi-transmissive film is provided inside the liquid crystal panel so that it can be used under both sunlight and dark environments. In many cases, a dielectric material or the like is used as a material for the film, and the use of such a semi-transmissive film causes distortion and rounding in the driving waveform.
[0015]
Hereinafter, this problem will be described in detail.
First, a liquid crystal panel provided with a semipermeable membrane will be described with reference to FIG.
This figure shows a cross-sectional view of a transflective color type liquid crystal panel.
[0016]
The scanning side substrate 8 and the signal side substrate 9 are bonded together with a seal portion 10, and a liquid crystal layer 11 is sealed in a region surrounded by the seal portion 10.
[0017]
The seal portion 10 is made of a thermosetting resin such as an epoxy type, an acrylic type, or a silicone type. In such a structure, the scanning side substrate 8 and the signal side substrate 9 are bonded via a sealant and further aligned. In this way, a seal portion 10 is formed by providing a space and heating and curing the sealant.
[0018]
When this space is provided, non-conductive spacers 12 made of resinous spheres are dispersed and dispersed between the scanning side substrate 8 and the signal side substrate 9, thereby making the distance between the substrates constant, and the liquid crystal layer therein. 11 is enclosed.
[0019]
A plurality of signal electrodes 13 are arranged in parallel on the signal substrate 9, and the arrangement pattern extends to the outside of the seal portion 10.
[0020]
A semi-transmissive film 21 is formed on the other scanning side substrate 8 and is made of a dielectric having a thickness of about 1 μm, for example. A color filter 14 and an overcoat 15 are sequentially formed thereon, and a plurality of scanning electrodes 16 are arranged in parallel thereon, and the arrangement pattern extends to the outside of the seal portion 10.
[0021]
The color filter 14 is coated with a color resin solution of each color in which red (R), green (G), and blue (B) colorants such as dyes and pigments are uniformly dispersed on a transparent resin and the like, and is patterned by a photolithography method. Formed by a dispersion method or the like.
[0022]
The overcoat 15 protects the color filter 14 and further prevents the coloring material from being eluted into the liquid crystal layer 11 and is made of a transparent resin.
[0023]
When the signal substrate 9 and the scanning side substrate 8 are bonded together, the signal electrode 13 and the scanning electrode 16 are arranged so as to be orthogonal to each other, and a region where these electrodes intersect becomes a rectangular display region.
[0024]
The signal electrode 13 and the scan electrode 16 are made of ITO (Indium Tin Oxide) or the like. The signal electrode 13 and the scan electrode 16 are covered with a polyimide resin alignment film 17.
[0025]
A signal electrode drive circuit and a scan electrode drive circuit are connected to the signal electrode 13 and the scan electrode 16 extending to the outside of the seal portion 10, respectively, and the liquid crystal panel is driven through these circuits.
[0026]
An optical compensation phase difference plate 18 and a polarizing plate 19 are disposed outside the scanning substrate 16 and the signal substrate 9, respectively, and a backlight system 20 is disposed on the scanning side substrate side of the liquid crystal panel. Then, light from the backlight system 20 is passed or blocked by ON (ON) and OFF (OFF) of the pixels in the display area, and a display state is achieved.
[0027]
In the transflective liquid crystal panel as described above, the decrease in visibility under strong light such as under sunlight in the transmissive panel can be eliminated by reflecting sunlight with the transflective film. On the other hand, display can be performed by turning on the backlight system 20 even in a dark place.
[0028]
However, the dielectric used in the semi-transmissive film 21 increases the line capacitance between the scanning electrodes of the liquid crystal panel, and each electrode is subject to noise interference due to the rise and fall of the applied voltage of the adjacent electrode when the liquid crystal display device is driven. Therefore, in actuality, a waveform during operation of the drive circuit as shown in FIG. 9 is obtained.
[0029]
In other words, the scan electrode Xi + 1 is applied with noise to the scan electrode Xi + 1 due to the rise of the selection voltage of the scan electrode Xi selected immediately before the scan electrode Xi + 1 is selected. Although only the noise accompanying the rising edge of the selection voltage is shown in the figure, the noise accompanying the falling edge is actually applied in the direction opposite to the voltage of the noise accompanying the rising edge. The rise was slowing down.
[0030]
More specifically, when the liquid crystal display device is driven, the number of scanning electrodes and the driving duty ratio of one screen are usually the same. If the number of scanning electrodes is n, the driving duty ratio is 1 / n. For example, in the case of an 800 × 600 dot two-screen split type liquid crystal display device, the number of scanning electrodes in one screen in two screens is 300, and the drive duty ratio is 1/300. In the control signal, 300 scan clocks LP exist within one frame period.
[0031]
However, in an electronic device equipped with a liquid crystal display device, not only the liquid crystal display device but also a CRT may be displayed at the same time, or the liquid crystal display device and the CRT may be switched and displayed. In many cases, both the display device and the CRT can be operated. Therefore, as shown in FIG. 11, the scanning start signal FRM of the control signal and the scanning clock LP do not have the same number of scanning clocks LP every time within one frame period, and n pulses and n + α pulses alternate (α is A positive integer, n is the same as the number n of scanning electrodes for one screen in FIG.
[0032]
This is called a simultaneous scan, but is a technique used when a CRT and a liquid crystal display device are operated simultaneously.
[0033]
For example, when n = 300 and n + α = 302, the drive duty ratio alternates between 1/300 and 1/302. In the frame period in which the scan clock LP is 302 pulses, the first scan electrode to the 300th scan electrode are sequentially selected from 1 to 300 pulses, but the 301st and 302th scan electrodes are selected in the 301st and 302nd pulses. Therefore, all lines are not selected during this period.
[0034]
In some cases, the scanning clock has n + α pulses each time, and in this case, the driving duty is 1/302.
[0035]
However, when the liquid crystal panel is operated by the above-described simultaneous scan or the like, there are the following problems. This problem will be described with reference to FIGS. 12A and 12B when the selection voltage is VH.
[0036]
As shown in FIG. 12A, in the period in which n scan clocks LP exist, after the scan electrode Xn selected at the end of the upper screen in one frame period is selected, the scan of the lower screen immediately adjacent thereto is performed. Scan electrode X1 ′, which is the starting electrode, is selected, so all scan electrodes are selected immediately after the adjacent scan electrodes are selected, and all scan electrodes are subject to noise interference from the adjacent scan electrodes, It can be said that the size is the same and there is no influence.
[0037]
However, since the scan electrode X1 ′ is not selected immediately after the scan electrode Xn is selected during the period in which the n + α pulse scan clock exists, the scan electrode X1 ′ is adjacent to the other scan electrodes. Of the noise interference received from the electrode (= scanning electrode Xn), especially due to the fall of the selection voltage does not overlap with the rise of the selection voltage as shown in FIG. However, the rise of the selection voltage becomes steep. Therefore, a larger voltage is applied to the pixels on the scan electrode X1 ′ than on the pixels on the other scan electrodes, and the pixels on the scan electrode X1 ′ are lit whiter than the surroundings and look like white stripes. It was.
[0038]
In addition, when there are n + α pulses each time the scanning clock is present, the noise interference received from the scanning electrode Xn of the scanning electrode X1 ′ is different from the other lines every frame period. It turned whiter than the surroundings and looked like white stripes.
[0039]
Accordingly, the present invention has been completed in view of the above description, and an object of the present invention is to drive a liquid crystal display device in which a white line-like streak generated at the boundary between both screens is eliminated in a two-screen division type simple matrix type liquid crystal display device. It is to provide a method.
[0040]
[Means for Solving the Problems]
Method for driving a liquid crystal display device of the present invention, opposed to the scanning side substrate scan electrode patterns run in one direction are arranged, and a signal side substrate signal electrode patterns are arranged in the other direction through the liquid crystal layer together is not formed with both the electrode pattern by intersecting table display region and the signal electrode pattern is divided into two, the number of scanning electrodes and the split-screen type liquid crystal panel in which a 2n present, of the scanning electrodes On the other hand with one screen scanning electrode driving circuit for driving the screen, and other screens scan electrode driving circuit that drives the other screen of the scan electrodes, and the one-screen signal electrode driving circuit for driving the one screen of the signal electrode, wherein the other screen signal electrode driving circuit for driving the other screen of the signal electrodes, a liquid crystal display device and the driving power supply circuit for generating a predetermined voltage for driving the liquid crystal panel, and have a, whereas the screen run of Scanning the other screen selected at the beginning of the frame period immediately after the 1 / (n + α) duty drive is performed when the drive duty is 1 / (n + α) for the number of electrodes n during the selection period of the electrode, relative to the other screen of the scanning electrodes selected in the first, while applying only a voltage in the non-selected short predetermined period of time than the selection period, whereas with respect to the scanning electrode number n of the screen When the duty driving with the driving duty of 1 / n is performed, the first selection is made during the scanning electrode selection period of the other screen selected at the beginning of the frame period immediately after the 1 / n duty driving is performed. The voltage at the time of non-selection is not applied to the scan electrodes of the other screen selected at the time of a predetermined period shorter than the selection period .
[0041]
The driving method of another liquid crystal display device of the present invention, when the driving dynamic duty was duty driving is 1 / (n + α), 1 / (n + α) of the first frame period immediately after the duty driving the beginning or end of the selected period of the other screen of the scan electrodes being selected, relative to the other screen of the scanning electrodes selected in the first, applying only the voltage at the non-selected short predetermined period of time than the selection period It is preferable.
[0042]
According to another driving method of the liquid crystal display device of the present invention, when duty driving with a driving duty of 1 / (n + α) is performed on the scanning electrode number n of one screen in two screens, The voltage at the time of non-selection is applied for a predetermined period shorter than the selection period of one line at the end of the selection period of the scan electrode of the other screen selected at the beginning of the frame period immediately after the (n + α) duty driving. In other words, since the timing for applying the non-selection voltage during the selection period is different from the above, the voltage applied to the pixel on the scan electrode X1 ′ can be similarly reduced by an increase. As a result, the pixels on the scanning electrode X1 ′ are also displayed in the same manner as the surrounding pixels, and as a result, white line-like streaks occurring at the boundary between the two screens can be eliminated.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Example 1)
FIG. 1 is a diagram schematically showing a liquid crystal display device according to the present invention. The same parts as those in the conventional liquid crystal display device shown in FIG.
[0044]
A scanning side substrate in which scanning electrode patterns and alignment films arranged in one direction are sequentially laminated, and a signal side in which signal electrode patterns and alignment films arranged in the other direction and divided in the center are sequentially laminated. A substrate is placed opposite to the liquid crystal layer, and both electrode patterns are crossed to form a rectangular display region.
[0045]
Upper screen scanning which is a liquid crystal panel 1 of the upper and lower two screen division type in which the total number of scanning electrodes is 2n, and the one screen scanning electrode driving circuit for driving the scanning electrode of the upper screen corresponding to the one screen among the scanning electrodes. The electrode driving circuit 2, the lower screen scanning electrode driving circuit 3 that is the other screen scanning electrode driving circuit for driving the scanning electrode for the lower screen that is the other screen, and the signal electrode for driving the upper screen among the signal electrodes On the other hand, to drive the upper screen signal electrode drive circuit 4 that is the screen signal electrode drive circuit, the lower screen signal electrode drive circuit 5 that is the other screen signal electrode drive circuit that drives the signal electrode on the lower screen, and the liquid crystal panel 1 A driving power source circuit 6 for generating a predetermined voltage, a scanning start signal FRM and a scanning clock LP, and a count circuit 7 for outputting a display signal CDISP according to the result. .
[0046]
The scanning start signal FRM, the scanning clock LP and the data latch pulse LP, the alternating signal DF, the data shift clock CP, the display data, and the display signal DISP which are control signals are supplied from the outside.
[0047]
The upper screen scan electrode drive circuit 2 and the lower screen scan electrode drive circuit 3 receive the scan start signal FRM, the scan clock LP, and the alternating signal DF, and the upper screen scan electrode drive circuit 2 receives the display signal DISP. The lower screen scan electrode drive circuit 3 is supplied with a display signal CDISP which is an output of a count circuit described later.
[0048]
Display data, data shift clock CP, data latch pulse LP (same as scanning clock), and display signal DISP are input to upper screen signal electrode drive circuit 4 and lower screen signal electrode drive circuit 5.
[0049]
The display signals DISP and CDISP are signals for controlling the scan electrode driving circuit and the signal electrode driving circuit to which the signals are input to the voltage VM.
[0050]
The count circuit 7 counts the scan start signal FRM and the scan clock. If the display signal DISP is ON, the count circuit 7 outputs the display signal CDISP of the lower screen scan electrode drive circuit 3 according to the count result.
[0051]
Next, the operation during the drive circuit operation when displaying with black circles and white circles as shown in FIG. 1 will be described with reference to FIGS. FIG. 2 shows the timing of the control signal, and FIG. 3 shows the actual operation waveform.
[0052]
The count circuit 7 counts the number of pulses of the scanning clock LP within the frame period after the pulse of the scanning start signal FRM is inputted. When the number of scan clocks LP counted within the frame period is the same as the number of scan electrodes on one screen, the output display signal CDISP continues to be turned on. On the other hand, when the number of scan clocks LP counted in one frame period is larger than the number of scan electrodes on one screen, the display signal CDISP is set to a predetermined value immediately after counting the first scan clock LP in the next frame period. Turn off only for a period. These are illustrated in FIG.
[0053]
When the display signal DISP is OFF, the display signal CDISP is OFF in any case.
[0054]
With the above operation, the drive waveform of the lower screen scan electrode drive circuit 3 is the same as the conventional one as shown in FIG. 3A when the scan clock LP is the same as the number of scan electrodes of one screen. When the scanning clock LP is larger than the number of scanning electrodes, as shown in FIG. 3B, only the top scanning electrode on the lower screen outputs the non-selection voltage VM for a predetermined period within the selection period. The
[0055]
For example, in the case of the above-mentioned 800 × 600 dot two-screen division type liquid crystal display device, the display signal CDISP is not turned off immediately after a period of 300 scanning clocks within one frame period, and scanning is performed within one frame period. When the number of clocks is more than 300 pulses, such as 302 pulses, only the uppermost scanning electrode of the lower screen selected at the beginning of the next frame period of that frame period displays a predetermined period display signal CDISP during the selected period. A non-selection voltage is output by turning OFF.
[0056]
The OFF period of the display signal CDISP is determined each time by the liquid crystal display device. Specifically, the pixels on the scan electrode X1 ′ may be equivalent to the display of surrounding pixels.
[0057]
Thus, in the liquid crystal display device of the present invention, the pixels on the scanning electrode X1 ′ are displayed in the same manner as the surrounding pixels by such an operation, and the white line-like streak generated at the boundary between the two screens as in the prior art is eliminated. And the border of the lower screen disappeared, and a high-quality display could be obtained.
[0058]
(Example 2)
Next, another driving method of the present invention will be described. This example will be described with the liquid crystal display device shown in FIG.
[0059]
FIG. 4 is a control signal diagram thereof, and FIG. 5 is a waveform diagram thereof.
In this example, the scanning start signal FRM and the scanning clock LP are counted and the display signal CDISP of the lower screen scanning electrode driving circuit is output, which is the same as in Example 1, but the period during which the display signal CDISP is stopped is the scanning electrode. Instead of the beginning of the selection period of X1 ′, it is at the end. Other than that, the pixel on the scanning electrode X1 ′ was displayed in the same manner as the surrounding pixels as in (Example 1), and as a result, a high-quality display without a boundary between the upper screen and the lower screen could be obtained.
[0060]
(Preferred example 1)
As described above, in the simple-matrix liquid crystal display device of the two-screen division type, the white line-like streak that occurs at the boundary between the two screens can be eliminated by the driving method of the present invention. The liquid crystal panel provided with the semipermeable membrane used by the body and the like has a remarkable effect.
[0061]
The liquid crystal panel provided with the semi-transmissive film of this example is the same as the configuration shown in FIG.
[0062]
(Preferred example 2)
Further, as described above, in an electronic device equipped with a liquid crystal display device, not only the liquid crystal display device but also a CRT may be displayed at the same time, or the liquid crystal display device and the CRT may be switched and displayed. The control circuit is configured to operate both the liquid crystal display device and the CRT, and the simultaneous scan technique is used for this structure. However, the control circuit is most suitable for such a technique, and a white line-like streak generated at the boundary between two screens is used. Was able to be resolved most effectively.
[0063]
It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements can be made without departing from the scope of the present invention. For example, in the above embodiment, the liquid crystal panel is a two-screen type on the upper and lower sides.
[0064]
【The invention's effect】
As described above, according to the driving method of the liquid crystal display device of the present invention, in the simple matrix type liquid crystal display device of the two-screen division type, the driving duty is 1 / scanning electrode number n per screen in two screens. When the duty drive of (n + α) is performed, one line is selected at the beginning of the scan electrode selection period of the other screen selected at the beginning of the frame period immediately after the 1 / (n + α) duty drive is performed. The voltage at the time of non-selection is applied for a predetermined period shorter than the selection period, or the scan electrode of the other screen selected at the beginning of the frame period immediately after the 1 / (n + α) duty drive is performed. At the end of the selection period, by applying the voltage at the time of non-selection for a predetermined period shorter than the selection period of one line, it is possible to eliminate white line streaks that occur at the boundary between the two screens, and to display a high quality display. Crystal display device is able to provide.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of a liquid crystal display device according to the present invention.
FIG. 2 is a diagram showing timings of control signals in the driving method of the present invention.
FIG. 3 is a diagram showing actual waveforms when a scan electrode driving circuit is driven by the driving method of the present invention.
FIG. 4 is a diagram showing timings of control signals in the driving method of the present invention.
FIG. 5 is a diagram showing actual waveforms when a scan electrode driving circuit is driven by the driving method of the present invention.
FIG. 6 is an explanatory diagram showing an outline of a conventional liquid crystal display device.
FIG. 7 is a diagram illustrating timings of control signals in a conventional driving method.
FIG. 8 is a diagram showing an ideal waveform when a scan electrode driving circuit is driven by a conventional driving method.
FIG. 9 is a diagram showing actual waveforms when a scan electrode driving circuit is driven by a conventional driving method.
FIG. 10 is a schematic cross-sectional view showing the structure of a transflective color liquid crystal panel.
FIG. 11 is an explanatory diagram of waveforms related to a simultaneous scan.
FIG. 12 is a diagram showing drive waveforms at the time of simultaneous scan.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 2 screen division type liquid crystal panel 2 ... Upper screen scanning electrode drive circuit 3 ... Lower screen scanning electrode drive circuit 4 ... Upper screen signal electrode drive circuit 5 ... Lower screen scanning electrode drive circuit 6 ... Drive power supply circuit 7 ... Count circuit DESCRIPTION OF SYMBOLS 8 ... Scanning side substrate 9 ... Signal side substrate 10 ... Seal part 11 ... Liquid crystal layer 12 ... Spacer 13 ... Signal electrode 14 ... Color filter 15 ... Overcoat 16 ... Scanning electrode 17 ... Alignment film 18 ... Phase difference plate 19 ... Polarizing plate 20 ... Backlight system 21 ... Semi-permeable membrane

Claims (2)

A scanning side substrate scan electrode patterns run in one direction are arranged, and a signal signal-side substrate electrode patterns are arranged by oppositely arranged with the liquid crystal layer by intersecting both of the electrode patterns in the other direction Table A two-screen split-type liquid crystal panel in which the signal electrode pattern is divided into two and the number of scanning electrodes is 2n, and one screen scanning electrode that drives one screen of the scanning electrode pattern a drive circuit, and the other screen scanning electrode driving circuit for driving the other screen of the scanning electrode pattern, and the one-screen signal electrode driving circuit for driving the one screen of the signal electrode pattern, the other screens of the signal electrode pattern a liquid crystal display device which possess the other screen signal electrode driving circuit for driving, and a driving power supply circuit for generating a predetermined voltage for driving the liquid crystal panel,
On the other hand, when the number n of scanning electrodes on the screen is driven with a duty of 1 / (n + α), it is selected at the beginning of the frame period immediately after the duty driving of 1 / (n + α). during the selection period of the other screen of the scan electrodes, relative to the other screen of the scanning electrodes selected in the first, while applying only a voltage in the non-selected short predetermined period of time than the selection period,
On the other hand, when the number n of scanning electrodes on the screen is driven with a duty of 1 / n, the scanning of the other screen selected at the beginning of the frame period immediately after the 1 / n duty driving is performed. A method for driving a liquid crystal display device, wherein a voltage during non-selection is not applied to a scanning electrode of the other screen that is initially selected during the electrode selection period for a predetermined period shorter than the selection period . When driving dynamic duty was duty driving is 1 / (n + α), 1 / (n + α) in the selection period of the first to the other screen of the scan electrodes that are selected in the frame period immediately after the duty drive of the beginning or end, to another screen of the scanning electrodes selected in the first, applying a short predetermined duration voltage when not selected than the selection period, the driving method of the liquid crystal display device according to claim 1 .

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