KR101018177B1 - Mehtod and apparatus of driving liquid crystal display - Google Patents

Abstract

The present invention relates to a method and apparatus for driving a liquid crystal display device which can prevent color distortion in the field sequential driving method.

A driving method for driving a liquid crystal cell of a liquid crystal panel by dividing one frame into three subframes of red (R), green (G), and blue (B), wherein each of the subframes generates a gate pulse and a reset pulse. And a first step of supplying data to the liquid crystal cell in response to the gate pulse, a second step of maintaining the liquid crystal cell voltage, and one of red light, green light, and blue light during the second step. Irradiating the liquid crystal cell, and supplying reset data to the liquid crystal cell in response to the reset pulse.

By this method, the present invention eliminates color distortion caused by the cumulative response characteristic of the liquid crystal.

Description

METHOD AND APPARATUS OF DRIVING LIQUID CRYSTAL DISPLAY}             

1 is a cross-sectional view showing a liquid crystal panel of a conventional liquid crystal display device.

2 is a cross-sectional view showing a liquid crystal panel of a liquid crystal display device according to a conventional field sequential driving method.

FIG. 3 is a waveform diagram illustrating a driving waveform of the liquid crystal display device according to the field sequential driving method shown in FIG. 2.

4 is a waveform diagram showing driving waveforms of a liquid crystal display for displaying yellow color according to a conventional field sequential driving method;

5 is a waveform diagram illustrating a driving waveform of a normally black liquid crystal display device according to a field sequential driving method according to an exemplary embodiment of the present invention.

FIG. 6 is a waveform diagram illustrating driving waveforms of a normally black liquid crystal display for displaying yellow color according to a field sequential driving method according to an exemplary embodiment of the present invention; FIG.

7 is a block diagram illustrating a driving device of a liquid crystal display device according to a field sequential driving method according to an exemplary embodiment of the present invention.

FIG. 8 is a waveform diagram showing a gate start pulse supplied to a gate driver from the timing controller shown in FIG.

<Description of Symbols for Main Parts of Drawings>

31: white lamp 32, 52: lower substrate

33, 53: pixel electrodes 34, 54: liquid crystal

35: color filter 36, 56: common electrode

37, 57: Upper substrate 51R, 74R: Red lamp

51G, 74G: Green lamp 51B, 74B: Blue lamp

60: liquid crystal panel 62: data driver

64: gate driver 66: timing controller

68: lamp drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for driving a liquid crystal display device, and more particularly, to a method and apparatus for driving a liquid crystal display device to prevent color distortion in a field sequential driving method.

In general, a liquid crystal display (LCD) displays an image by adjusting light transmittance of liquid crystal cells according to a video signal. An active matrix liquid crystal display device in which switching elements are formed for each liquid crystal cell is suitable for displaying moving images. As a switching element used in an active matrix liquid crystal display device, a thin film transistor (hereinafter, referred to as TFT) is mainly used.

Referring to FIG. 1, a common electrode 36 and a color filter 35 are stacked on an upper substrate 37 and a pixel electrode 33 is formed on a lower substrate 32 in a liquid crystal panel of a conventional LCD. The liquid crystal 34 is injected between the upper substrate 37 and the lower substrate 32. Under the lower substrate 32, a white lamp 31 serving as a backlight light source is installed. A black matrix (not shown) is formed on the upper substrate 37 between the red, green, and blue color filters 35. An alignment film (not shown) is formed on each of the upper substrate 37 and the lower substrate 32 on an interface in contact with the liquid crystal 34. Gate lines and data lines (not shown) are orthogonal to the lower substrate 32, and TFTs are formed at respective intersections of the gate lines and the data lines. The TFT forms a channel between the source terminal connected to the data line and the drain terminal connected to the pixel electrode 33 in response to a gate pulse applied to its gate terminal via the gate line to the pixel electrode 33. Apply data. The pixel electrode 33 is formed in the pixel area surrounded by the gate lines and the data lines.

In such a liquid crystal panel, a voltage is applied to the white lamp 31 so that white light is continuously radiated. While the white lamp 31 is turned on, the TFT is turned on by the gate pulse so that red, green and blue data are simultaneously applied to the liquid crystal cell. As a result, the white light irradiated to the liquid crystal panel passes through the liquid crystal cell and then passes through the red, green, and blue color filters 35 to change into red light, green light, and blue light. The liquid crystal panel displays a desired color by combining red light, green light and blue light.

As described above, the liquid crystal panel of the conventional liquid crystal display device has a low luminance because light is lost to about 1/3 or less while passing through the color filter 35. Field sequential has been proposed to solve such a decrease in light efficiency.

2 is a schematic cross-sectional view of a liquid crystal panel driven by a field sequential driving method.

Referring to FIG. 2, the liquid crystal panel of the conventional field sequential driving method has no color filter and includes a red lamp 51R, a green lamp 51G, and a blue lamp 51B. A black matrix (not shown) is formed on the upper substrate 57 of the liquid crystal panel. An alignment film (not shown) is formed on each of the upper substrate 57 and the lower substrate 52 on an interface in contact with the liquid crystal 54. Gate lines and data lines (not shown) are orthogonal to the lower substrate 52, and TFTs are formed at respective intersections of the gate lines and the data lines. The TFT forms a channel between the source terminal connected to the data line and the drain terminal connected to the pixel electrode 53 in response to a gate pulse applied to its gate terminal via the gate line to the pixel electrode 53. Apply data. The pixel electrode 53 is formed in the pixel area surrounded by the gate lines and the data lines. In the field sequential driving method, a lamp driving voltage is sequentially applied to the red lamp 51R, the green lamp 51G, and the blue lamp 51B, and red light, green light, and blue light are sequentially irradiated onto the liquid crystal panel.

As described above, in the field sequential driving method, one frame (generally 16.7 ms) on the liquid crystal panel is divided into three subframes of red (R), green (G), and blue (B) as shown in FIG. Each subframe (5.56 ms based on 16.7 ms) is divided into a data writing section WT, a liquid crystal response section AT, and a lamp lighting section LT. The data is supplied to the pixel electrode 53 in response to the gate pulse GP during the data writing period WT, and the data supplied to the pixel electrode 53 is kept constant during the liquid crystal response period AT. In addition, the light from the lamp penetrates the liquid crystal to display a desired color while the data supplied to the pixel electrode 53 is maintained during the lamp lighting section LT.

In other words, the liquid crystal display according to the conventional field sequential driving method supplies a red data voltage to the liquid crystal cell using the gate pulse GP during the data writing period WT in the first subframe of one frame, and The red data supplied to the liquid crystal cell is kept constant during the response period AT, and the red lamp 51R is turned on during the lamp lighting period LT to transmit red light to the liquid crystal cell supplied with the red data. Accordingly, the red light is displayed in the liquid crystal cell supplied with the red data in the first subframe of one frame.

Then, in the second subframe of one frame, the green data voltage is supplied to the liquid crystal cell using the gate pulse GP during the data writing period WT, and the green data supplied to the liquid crystal cell during the liquid crystal response period AT. Is kept constant, and the green lamp 51G is turned on during the lamp lighting section LT so that green light is transmitted through the liquid crystal cell supplied with the green data. Accordingly, the green light is displayed in the liquid crystal cell supplied with the green data in the second subframe of one frame.

Finally, in the third subframe of one frame, the blue data voltage is supplied to the liquid crystal cell using the gate pulse GP during the data writing period WT, and the blue data supplied to the liquid crystal cell during the liquid crystal response period AT. Is kept constant, and the blue lamp 51B is turned on during the lamp lighting section LT so that blue light is transmitted through the liquid crystal cell to which blue data is supplied. Accordingly, blue light is displayed in the liquid crystal cell to which blue data is supplied in the third subframe of one frame.

In the conventional method of driving a liquid crystal display device according to the field sequential driving method, an image is displayed by time-dividing one frame into first to third subframes, and additionally mixing red light, green light, and blue light in each subframe. .

In the liquid crystal display according to the conventional field sequential driving method, when yellow and yellow are displayed by temporarily mixing red and green using human time resolution, as shown in FIG. In one sub frame period, red data is supplied to the liquid crystal cell in response to the first gate pulse GP, and then red light from the red lamp 51R is transmitted to the liquid crystal cell to which the red data is supplied. Then, in the second sub frame period of one frame, green data is supplied to the liquid crystal cell in response to the second gate pulse GP, and then green light from the green lamp 51G is transmitted to the liquid crystal cell to which the green data is supplied. Let's go. In addition, in the third sub frame period of one frame, blue data of zero voltage is supplied to the liquid crystal cell in response to the third gate pulse GP. Accordingly, the blue light from the blue lamp 51B is not transmitted to the liquid crystal cell to which the blue data of the black voltage having zero transmittance is supplied. Therefore, in the liquid crystal cell, red light of the first subframe and green light of the second subframe are additively mixed to display a yellow color.

However, in the liquid crystal display device according to the conventional field sequential driving method, the cumulative response characteristic according to the hold type driving that drives the liquid crystal using the data supplied to the pixel electrode in response to the gate pulse GP is shown. Due to this cumulative response characteristic, a distorted transmittance appears, and when the light transmitted through the liquid crystal from the red lamp 51R, the green lamp 51G, and the blue lamp 51B light source is additively mixed, the color appears distorted.

In detail, the cumulative response characteristic of the liquid crystal display according to the conventional field sequential driving method is a red data and a red lamp during the first subframe of one frame when the yellow color is displayed, for example, as shown in FIG. 4. After the red light is transmitted through the liquid crystal using the 51R, the green light is transmitted through the green data and the green lamp 51G during the second subframe to display the yellow color. However, in the second subframe, the transmittance of the liquid crystal according to the green data voltage is accumulated in the red light transmittance in the first subframe period. Therefore, the transmittance of the green light passing through the liquid crystal in the second subframe is relatively higher than the transmittance of the red light passing through the liquid crystal in the first subframe. As a result, a yellow color close to green is displayed, causing distortion of the color to be displayed.

Accordingly, an object of the present invention is to provide a method and apparatus for driving a liquid crystal display device capable of preventing color distortion in the field sequential driving method.

In order to achieve the above object, a liquid crystal display device driving method according to an embodiment of the present invention is divided into three sub-frames of the red (R), green (G) and blue (B) the liquid crystal cell of the liquid crystal panel In the driving method for driving, each of the sub-frames, generating a gate pulse and a reset pulse, a first step of supplying data to the liquid crystal cell in response to the gate pulse, and a second maintaining the liquid crystal cell voltage And irradiating any one of red light, green light, and blue light to the liquid crystal cell during the second step, and supplying reset data to the liquid crystal cell in response to a reset pulse. .

In the driving method, the reset pulse is a gate high voltage.

In the driving method, a width of each of the gate pulse and the reset pulse may be set so that the arbitrary gate pulse and the reset pulse do not overlap.

The reset data is black data which makes the transmittance of the liquid crystal cell zero.

According to an aspect of the present invention, there is provided a driving apparatus for driving a liquid crystal cell of a liquid crystal panel by dividing one frame into three subframes of red (R), green (G), and blue (B); A data driver for supplying data to the liquid crystal cell, a gate generator for supplying the data to the liquid crystal cell, and a signal generator for generating a reset pulse for resetting the data supplied to the liquid crystal cell.

The driving device includes a red lamp for generating red light; A green lamp for generating green light; A blue lamp for generating blue light; A lamp driving unit for driving the lamps sequentially.

The driving device supplies the signal generator with a first gate start pulse for generating the gate pulse and a second gate start pulse for generating the reset pulse, and drives the red lamp, the green lamp, and the blue lamp, respectively. It further comprises a timing controller for generating a ramp control signal for.

In the driving apparatus, the timing controller supplies the lamp control signal to the lamp driver before the reset pulse is supplied to the liquid crystal cell.

In the driving apparatus, the reset pulse is a gate high voltage.

The width of each of the gate pulse and the reset pulse in the driving device is set so that the arbitrary gate pulse and the reset pulse do not overlap.

The reset data which makes the transmittance of the liquid crystal cell to zero in response to the reset pulse is characterized in that the black data.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 8.

Referring to FIG. 5, a method and apparatus for driving a normally black liquid crystal display using a field sequential driving method according to an exemplary embodiment of the present invention may include one frame (typically 16.7 ms) on a liquid crystal panel (not shown) in red (R). ), Green (G) and blue (B) into three subframes. Each subframe (5.56 ms based on 16.7 ms) is divided into a data writing section WT, a liquid crystal response section AT, a lamp lighting section LT, and a reset section RT. The data is supplied to a pixel electrode (not shown) in response to the gate pulse GP during the data writing period WT, and the data supplied to the pixel electrode is kept constant during the liquid crystal response period AT. In addition, during the lamp lighting section LT, the light from the lamp passes through the liquid crystal supplied with the data to display a desired color, and during the reset section RT, the data supplied to the liquid crystal cell is reset in response to the reset pulse RP. Let's go. Here, each of the gate pulses GP and the reset pulses RP is set so that its width does not overlap between the gate pulses GP supplied to an arbitrary gate line and the reset pulses RP supplied to an arbitrary gate line. That is, the gate pulse GP and the reset pulse RP have a width smaller than that of the conventional gate pulse GP. At this time, the reset pulse RP is equal to the gate pulse GP, that is, the gate high voltage.

In detail, the LCD according to the field sequential driving method according to an exemplary embodiment of the present invention reds the liquid crystal cell in response to the first gate pulse GP1 during the data writing period WT in the first subframe of one frame. The data voltage is supplied, the red data supplied to the liquid crystal cell is kept constant during the liquid crystal response period AT, and the red light is turned on during the lamp lighting period LT so that red light is supplied to the liquid crystal cell maintained with the red data supplied. Permeate. Accordingly, the red light is displayed in the liquid crystal cell supplied with the red data in the first subframe of one frame, and is applied to the first reset pulse RP1 having a phase different from that of the first gate pulse GP1 during the reset period RT. In response, the liquid crystal cell is reset so that the light transmittance is zero. That is, when the first reset pulse RP1 is supplied to the gate line, reset data is supplied to the data line to reset the liquid crystal cell. At this time, in the normally black driving method, data of zero voltage is supplied to the liquid crystal cell, and in the normally white driving method, data of a constant voltage is supplied to the liquid crystal cell and supplied to the liquid crystal cell by the voltage difference between the liquid crystal cell and the data line. The data to be reset is reset.

Then, in the second subframe of one frame, the liquid crystal cell is responded to the liquid crystal cell in response to the second gate pulse GP2 during the data write period WT while being reset by the reset period RT of the first subframe. The green light is supplied to the liquid crystal cell that supplies the green data voltage, maintains the green data supplied to the liquid crystal cell during the liquid crystal response period AT constantly, and the green lamp is turned on during the lamp lighting period LT. Is transmitted. Accordingly, the green light is displayed in the liquid crystal cell supplied with the green data in the second subframe of one frame, and the data supplied to the liquid crystal cell is reset in response to the second reset pulse RP2 during the reset period RT. .

Lastly, in the third subframe of one frame, the liquid crystal cell is connected to the liquid crystal cell in response to the third gate pulse GP3 during the data write period WT while being reset by the reset period RT of the second subframe. The blue data voltage is supplied, the blue data supplied to the liquid crystal cell is kept constant during the liquid crystal response period (AT), and the blue lamp is turned on during the lamp lighting period LT so that the blue data is supplied and maintained. Blue light is transmitted. Accordingly, blue light is displayed in the liquid crystal cell to which blue data is supplied in the third subframe of one frame, and the data supplied to the liquid crystal cell is reset in response to the third reset pulse RP3 during the reset period RT. .

The driving method of the liquid crystal display according to the field sequential driving method according to the embodiment of the present invention time-divides one frame into first to third subframes, and additionally mixes red, green, and blue light in each subframe. An image is displayed.

As a result, in the field sequential driving method according to the embodiment of the present invention, red, green, and blue data are time-divided to 1/3 or less of one frame period and supplied to the liquid crystal cell, and time-divided time-divided red light, green light, and blue light. Divided into permeate. In addition, a reset period (RT) is provided between each time-divided subframe to reset the supplied data of the liquid crystal cell in each subframe so that the liquid crystal transmittance is zero to prevent color distortion due to the cumulative response characteristics of the liquid crystal. It becomes possible.

Referring to FIG. 6, in the normally black liquid crystal display device according to the field sequential driving method according to an exemplary embodiment of the present invention, a yellow color is displayed by temporarily mixing red light and green light using human time resolution. When described as follows.

In the first subframe of one frame, the red data voltage is supplied to the liquid crystal cell in response to the first gate pulse GP1 during the data writing period WT, and the red data supplied to the liquid crystal cell is supplied during the liquid crystal response period AT. It is kept constant and the red lamp is turned on during the lamp lighting section LT so that the red light is transmitted through the liquid crystal cell in which the red data is supplied. Accordingly, the red light is displayed in the liquid crystal cell supplied with the red data in the first subframe of one frame, and the data supplied to the liquid crystal cell is reset in response to the first reset pulse RP1 during the reset period RT. .

Then, in the second subframe of one frame, the liquid crystal cell is responded to the liquid crystal cell in response to the second gate pulse GP2 during the data write period WT while being reset by the reset period RT of the first subframe. The green light is supplied to the liquid crystal cell that supplies the green data voltage, maintains the green data supplied to the liquid crystal cell during the liquid crystal response period AT constantly, and the green lamp is turned on during the lamp lighting period LT. Is transmitted. Accordingly, the green light is displayed in the liquid crystal cell supplied with the green data in the second subframe of one frame, and the data supplied to the liquid crystal cell is reset in response to the second reset pulse RP2 during the reset period RT. .

Lastly, in the third sub frame period of one frame, the black voltage is applied to the liquid crystal cell using the third gate pulse GP3 during the data writing period WT while being reset by the reset period RT of the second sub frame. The blue data of the black voltage supplied to the liquid crystal cell during the liquid crystal response section (AT), and the blue data of the black voltage supplied to the liquid crystal cell during the liquid crystal response period (AT), and the blue lamp is turned on during the lamp lighting period (LT) Blue light from the light is transmitted. At this time, blue light from the blue lamp is not transmitted to the liquid crystal cell to which the blue data of the black voltage is supplied. In addition, the data supplied to the liquid crystal cell is reset in response to the third reset pulse RP3 during the reset period RT.                     

Therefore, in the liquid crystal cell, red light of the first subframe and green light of the second subframe are additively mixed to display a yellow color.

Referring to FIG. 7, a driving device of a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel 60 and a data line of a liquid crystal panel 60 in which a data line and a gate line cross each other and a TFT is formed at an intersection thereof. A data driver 62 for supplying data to the data source, a gate driver 64 for supplying a gate pulse to the gate line of the liquid crystal panel 60, and timing at which digital video data and a synchronization signal (H, V) are supplied. The controller 66 and a lamp driver 68 for driving the red lamp 74R, the green lamp 74G and the blue lamp 74B are provided.

In the liquid crystal panel 60, liquid crystal is injected between two glass substrates. The TFT formed at the intersection of the data lines and the gate lines of the liquid crystal panel 60 supplies the data on the data lines to the liquid crystal cell in response to a scanning pulse from the gate driver 64. The source electrode of this TFT is connected to the data line, and the drain electrode is connected to the pixel electrode of the liquid crystal cell. The gate electrode of the TFT is connected to the gate line.

The timing controller 66 divides one frame (typically 16.7 ms) into three subframes of red (R), green (G), and blue (B), and provides a control signal for driving the liquid crystal panel 60 to the data driver. And the gate driver 64. At this time, each subframe is divided into a data writing section, a liquid crystal response section, a lamp lighting section and a reset section.

To this end, the timing controller 66 rearranges the digital video data supplied from the digital video card (not shown) for each of red (R), green (G), and blue (B). The data RGB rearranged by the timing controller 66 is supplied to the data driver 62. In addition, the timing controller 66 generates a data control signal and a gate control signal at a frequency required for the field sequential driving method by using the horizontal / vertical synchronization signals H and V input thereto. The data control signal is supplied to the data driver 62 including a dot clock Dclk, a source shift clock SSC, a source enable signal SOE, a polarity inversion signal POL, and the like. The gate control signal is supplied to the gate driver 64 including a gate start pulse GSP, a gate shift clock GSC, a gate output enable GOE, and the like. In addition, the timing controller 66 controls the lamp driver 68 so that the red lamp 74R, the green lamp 74G, and the blue lamp 74B are sequentially driven when the data is completely supplied to the liquid crystal cell.

The gate start pulse GSP supplied to the gate driver 64 in the timing controller 66 is the first pulse supplied at the data supply time A for supplying data to the liquid crystal cell as shown in FIG. 8. And a second pulse supplied to the liquid crystal response section B for keeping the data supplied to the liquid crystal cell constant and a third pulse supplied to the reset section C for resetting the data supplied to the liquid crystal cell.

The data driver 62 samples the data according to the data control signal from the timing controller 66, and then latches the sampled data by one line and converts the latched data into an analog gamma voltage from a gamma voltage supply (not shown). do.

The gate driver 64 includes a shift register which sequentially generates gate pulses in response to the gate start pulse GSP among the gate control signals from the timing controller 66, and a voltage suitable for driving the liquid crystal cell with the gate pulse voltage. It includes a level shifter for shifting to a level. The gate driver 64 generates a gate pulse in response to the first pulse of the gate start pulse GSP from the timing controller 66, and generates a reset pulse in response to the third pulse of the gate start pulse GSP. RP). Accordingly, the gate driver 64 supplies the gate pulse GP as shown in FIG. 7 to the gate line to turn on the TFT, so that the video data on the data line is supplied to the liquid crystal cell, and the gate start pulse GSP. The data supplied to the liquid crystal cell is kept constant in response to the second pulse, and the reset pulse RP is supplied to the gate line to reset the data supplied to the liquid crystal cell. That is, the gate driver is a signal generator for generating the gate pulse GP and the reset pulse RP. At this time, the gate pulse GP and the reset pulse RP have the same voltage as the gate high voltage.

The lamp driver 68 controls the red lamp 74R, the green lamp 74G, and the blue lamp during the liquid crystal response period, which is a time point at which data is completely supplied to the liquid crystal cell within each subframe by the control of the timing controller 66. Any one of 74B is turned on, and is turned off in each sub frame reset section C. FIG. That is, the red lamp 74R is turned on in the reset section C after the red lamp 74R is turned on in the liquid crystal response section B in which red data is completely supplied to the liquid crystal cell as shown in FIG. The green lamp 74G is turned on in the liquid crystal response section B in which green data is completely supplied to the liquid crystal cell as shown in FIG. 4, and then is turned off in the reset section C. As shown in FIG. The blue lamp 74B lights up in the liquid crystal response section B in which blue data is completely supplied to the liquid crystal cell as shown in FIG. 4, and then turns off in the reset section C.                     

As described above, the driving device of the liquid crystal display according to the embodiment of the present invention resets the gate pulse for supplying data to the liquid crystal cell, the second pulse for holding the data supplied to the liquid crystal cell, and the data supplied to the liquid crystal cell. The gate start pulse GSP divided by the third pulse is supplied to the gate driver 64. The gate driver 64 supplies a gate pulse to the liquid crystal panel 60 using a first pulse to supply data to the liquid crystal cell, and supplies a reset pulse to the liquid crystal panel 60 using a third pulse. The liquid crystal cell is reset. Therefore, the present invention eliminates color distortion caused by the cumulative response characteristics of liquid crystals between subframes.

As described above, the driving method of the liquid crystal display according to the exemplary embodiment of the present invention supplies the reset pulse to the gate line after the lamp lighting section in the field sequential driving type. Accordingly, the present invention eliminates the color distortion caused by the cumulative response characteristics of the liquid crystal.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (11)

In a driving method for driving a liquid crystal cell of a liquid crystal panel by dividing one frame into three subframes of red (R), green (G), and blue (B), Each of the subframes, Generating a gate pulse in response to the first pulse of the gate start pulse; A first step of supplying a data voltage to the liquid crystal cell in response to the gate pulse; A second step of maintaining a data voltage supplied to the liquid crystal cell in response to a second pulse of the gate start pulse; Irradiating any one of red light, green light and blue light to the liquid crystal cell during the second step; Generating a reset pulse in response to a third pulse of the gate start pulse; Supplying reset data which is black data to zero the transmittance of the liquid crystal cell to the liquid crystal cell in response to the reset pulse; The gate pulse and the reset pulse are gate high voltages, And any one of the red light, the green light, and the blue light is turned on during the second step, and the lit light is turned off at the step of supplying the reset data. delete delete delete A first step of driving a liquid crystal cell of a liquid crystal panel by dividing one frame into three subframes, each of the subframes comprising: a first step of supplying data to the liquid crystal cell, and a second step of holding data supplied to the liquid crystal cell; And irradiating any one of red light, green light and blue light to the liquid crystal cell during the second step, and supplying reset data, which is black data to zero the transmittance of the liquid crystal cell, to the liquid crystal cell. In the driving device of the liquid crystal display device, A data driver for supplying the data and reset data to the liquid crystal cell; A signal generator for generating a gate pulse for supplying the data to the liquid crystal cell and a reset pulse for resetting the data supplied to the liquid crystal cell; A red lamp, a green lamp, and a blue lamp for generating the red light, the green light, and the blue light, respectively; A lamp driver for sequentially driving the lamps; A timing controller for supplying a first gate start pulse for generating the gate pulse and a second gate start pulse for generating the reset pulse to the signal generator and generating a ramp control signal for driving the respective lamps; The lamp control signal is supplied to the lamp driver before the reset pulse resets the data supplied to the liquid crystal cell, the gate pulse and the reset pulse are gate high voltages, The red lamp, the green lamp, and the blue lamp are turned on while data supplied to the liquid crystal cell is maintained in response to the first gate start pulse, and reset data is supplied to the liquid crystal cell in response to the reset pulse. A drive device for a liquid crystal display device, which is turned off at a time point. delete delete delete delete delete delete

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