KR101987799B1 - Display device and driving method thereof - Google Patents

Abstract

The present invention relates to a display apparatus and a driving method thereof. A display device according to an embodiment of the present invention includes a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gradation voltage, Wherein the pixel displays an image corresponding to one input image signal during a set of frames including two or more consecutive frames, The image displayed during the frame set is a first image along the first gamma curve and And a second image according to the second gamma curve. The luminance of the first image is not lower than the luminance of the second image, and the second image is displayed in two consecutive frames.

Description

DISPLAY DEVICE AND DRIVING METHOD THEREOF [0002]

The present invention relates to a display apparatus and a driving method thereof, and more particularly to a display apparatus and a driving method thereof that can improve visibility.

A display device such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display generally includes a display panel having a plurality of pixels including a switching element and a plurality of signal lines, And a data driver for generating a plurality of gradation voltages using the gradation reference voltage and applying a gradation voltage corresponding to the input image signal among the generated gradation voltages as data signals to the data lines.

The liquid crystal display device includes a liquid crystal layer having a dielectric anisotropy and two display panels provided with a pixel electrode and a counter electrode. The pixel electrodes are arranged in the form of a matrix and connected to a switching element such as a thin film transistor (TFT), and are supplied with a data voltage one row at a time. The counter electrode is formed over the entire surface of the display panel and receives the common voltage Vcom. A desired image can be obtained by applying a voltage to the pixel electrode and the counter electrode to generate an electric field in the liquid crystal layer and adjusting the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer.

In a vertically aligned mode liquid crystal display device in which the long axes of the liquid crystal molecules are arranged perpendicular to the upper and lower display plates in the absence of an electric field applied to the liquid crystal display device, a contrast ratio is large and a wide reference viewing angle is easy to implement. However, the liquid crystal display of the vertical alignment type may have less visibility than the front view. To solve this problem, a method of dividing one pixel into two sub-pixels and varying the voltages of two sub-pixels has been proposed. If one pixel is divided into two sub-pixels as described above, the opening through which light can pass through is reduced, and the transmittance may be lowered.

A problem to be solved by the present invention is to provide a display device and a driving method thereof that can improve the display quality by improving the transmittance and side viewability.

A display device according to an embodiment of the present invention includes a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gradation voltage, Wherein the pixel displays an image corresponding to one input image signal during a set of frames including two or more consecutive frames, The image displayed during the frame set is a first image along the first gamma curve and And a second image according to the second gamma curve. The luminance of the first image is not lower than the luminance of the second image, and the second image is displayed in two consecutive frames.

The order of the images displayed by the pixels in the first frame set and the order of the images displayed by the pixels in the second frame set subsequent to the first frame set may be opposite to each other.

The set of frames includes three or more consecutive frames, and during the first set of frames, the first image may be displayed for one frame and the second image may be displayed for two or more consecutive frames.

Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves, the pixel further displays a third image along the third gamma curve during the one frame set, The luminance of the third image may not be higher than the luminance of the first image and may not be lower than the luminance of the second image.

Wherein the display panel includes a first pixel and a second pixel that are adjacent to each other and display an image corresponding to different input video signals, and each of the first pixel and the second pixel includes two or more consecutive frames Wherein an image corresponding to one input image signal during a frame set is displayed, and an image displayed by each of the first pixel and the second pixel during the frame set includes the first image and the second image, The gamma curve of the image displayed by the first pixel and the gamma curve of the image displayed by the second pixel may be different from each other.

The set of frames may comprise three or more consecutive frames.

In the frame set, the frame in which the pixel displays the third image may be located between the frame displaying the first image and the frame displaying the second image.

The third image may be displayed in two consecutive frames.

Wherein the memory further stores gamma data for a fourth gamma curve different from the first, second and third gamma curves, and wherein the pixel further displays a fourth image along the fourth gamma curve during the one frame set And the luminance of the fourth image may not be higher than the luminance of the third image and may not be lower than the luminance of the second image.

In the frame set, the frame for displaying the fourth image may be located between the frame for displaying the third image and the frame for displaying the second image.

Wherein each of the first sub-pixel and the second sub-pixel includes a first sub-pixel and a second sub-pixel, each of the first sub-pixel and the second sub-pixel corresponding to the input video signal during the one frame set, And the second image displayed by one of the first sub-pixel and the second sub-pixel may be displayed in two consecutive frames.

The order of the images displayed by the first and second sub-pixels in the first frame set and the order of the images displayed by the first and second sub-pixels in the second frame set subsequent to the first frame set are opposite Lt; / RTI >

Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves, and wherein at least one of the first sub-pixel and the second sub- The third image according to the curve may further be displayed and the brightness of the third image may not be higher than the brightness of the first image and may not be lower than the brightness of the second image.

Wherein the display panel includes a first pixel and a second pixel that are adjacent to each other and display an image corresponding to a different input image signal, and each of the first pixel and the second pixel displays an image of the one input image signal Wherein each of the first pixel and the second pixel includes a first subpixel and a second subpixel for displaying an image corresponding to the one input image signal during one frame set including two or more consecutive frames A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by a gamma curve in one frame, and a second gamma curve of the first sub-pixel and the second sub- May be different from each other.

The frame in which one of the first sub-pixel and the second sub-pixel displays the third image in the frame set is located between the frame displaying the first image and the frame displaying the second image .

The order of the images displayed by the first and second sub-pixels in the first frame set and the order of the images displayed by the first and second sub-pixels in the second frame set subsequent to the first frame set are opposite Lt; / RTI >

The third image displayed by one of the first sub-pixel and the second sub-pixel may be displayed in two consecutive frames.

Wherein the display panel includes a first pixel and a second pixel that are adjacent to each other and display an image corresponding to a different input image signal, and each of the first pixel and the second pixel displays an image of the one input image signal Wherein each of the first pixel and the second pixel includes a first subpixel and a second subpixel for displaying an image corresponding to the one input image signal during one frame set including two or more consecutive frames A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by a gamma curve in one frame, and a second gamma curve of the first sub-pixel and the second sub- May be different from the gamma curve that follows the image displayed by at least one of them.

Wherein the memory further stores gamma data for a fourth gamma curve different from the first, second and third gamma curves, and wherein at least one of the first sub-pixel and the second sub- The fourth image according to the fourth gamma curve may be further displayed and the luminance of the fourth image may not be higher than the luminance of the third image and may not be lower than the luminance of the second image.

A frame in which one of the first sub-pixel and the second sub-pixel displays the fourth image in the frame set is located between a frame displaying the third image and a frame displaying the second image .

Wherein the display panel includes a first pixel and a second pixel that are adjacent to each other and display an image corresponding to different input video signals, and each of the first pixel and the second pixel includes two or more consecutive frames Wherein an image corresponding to one input image signal during a frame set is displayed, and an image displayed by each of the first pixel and the second pixel during the frame set includes the first image and the second image, The second pixel may display the second image when the first pixel displays the first image.

And a backlight unit for providing light to the display panel, wherein the frame set includes a first frame and a second frame following the first frame, the pixel displays the first image in the first frame And the backlight unit provides the light of the first luminance to the display panel in the second frame and the light of the second luminance lower than the first luminance in the second frame, As shown in FIG.

The brightness of the second image displayed in the second frame is 0, and the backlight unit is turned off during the second frame so as not to provide light to the pixel.

The backlight may be turned on for a first time in the second frame to provide light to the pixel, and the duty ratio of the first time may be less than one.

And a backlight unit for providing light to the display panel, wherein the set of frames includes a first frame and a second frame following the first frame, the pixels displaying the second image in the first frame The brightness of the light provided by the backlight unit to the pixel in the second frame may be higher than the brightness of light provided to the pixel by the backlight unit in the first frame.

The brightness of the second image displayed in the first frame may be zero or the brightness of the first image displayed in the second frame may be the maximum brightness.

Wherein the display panel further comprises a liquid crystal layer including a plurality of liquid crystal molecules, and when displaying the image of the second luminance lower than the first luminance after the pixel displays the image of the first luminance in two neighboring frames, The falling response speed of the liquid crystal molecules when the luminance of the image displayed by the pixel changes from 99% to 1% of the luminance difference between the first and second luminance images may be 4.17 ms or less when the frame frequency is 240 Hz.

Wherein the display panel further comprises a liquid crystal layer including a plurality of liquid crystal molecules, and when displaying the image of the second luminance lower than the first luminance after the pixel displays the image of the first luminance in two neighboring frames, The falling response speed of the liquid crystal molecules when the luminance of the image displayed by the pixel changes from 99% to 1% of the luminance difference between the first and second luminance images may be 8.3 ms or less when the frame frequency is 120 Hz.

A display device according to an embodiment of the present invention includes a memory for storing gamma data for two or more gamma curves, a gradation voltage generator for generating a gradation voltage based on the gamma data, a signal for receiving an input video signal from the outside A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, And a display panel including a second pixel, wherein the first pixel and the second pixel are adjacent to each other and display an image corresponding to a different input image signal, and each of the first pixel and the second pixel includes two Corresponding to one input video signal during one frame set including more than one consecutive frame Wherein the image displayed by the first pixel and the second pixel during the frame set includes an image along the at least two gamma curves, The gamma curve and the gamma curve that the image displayed by the second pixel follow are different from each other.

Wherein each of the first pixel and the second pixel includes a first sub-pixel and a second sub-pixel for displaying an image for the one input video signal, and the first sub-pixel and the second sub- The gamma curves of at least one of the second sub-pixels and the gamma curves of at least one of the first sub-pixel and the second sub-pixel of the second pixel may be different from each other.

A display device according to an embodiment of the present invention includes a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, A display panel including a pixel for displaying an image on a frame basis and a backlight for providing light to the display panel, the pixel including a plurality of pixels corresponding to one input image signal during one frame set including two or more consecutive frames Wherein the frame set includes a first frame and a first frame, Wherein the pixel displays a first image along the first gamma curve in the first frame and a second image along the second gamma curve in the second frame, Wherein the brightness of the first image is not lower than the brightness of the second image and the backlight provides the light of the first brightness to the display panel in the first frame and the second brightness To the display panel.

The brightness of the second image displayed in the second frame is 0, and the backlight unit is turned off during the second frame so as not to provide light to the pixel.

The backlight may be turned on for a first time in the second frame to provide light to the pixel, and the duty ratio of the first time may be less than one.

A display device according to an embodiment of the present invention includes a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, A display panel including a pixel for displaying an image on a frame basis and a backlight for providing light to the display panel, the pixel including a plurality of pixels corresponding to one input image signal during one frame set including two or more consecutive frames Wherein the frame set includes a first frame and a first frame, Wherein the pixel displays a second image along the second gamma curve in the first frame and a first image along the first gamma curve in the second frame, Wherein the luminance of the first image is not lower than the luminance of the second image and the luminance of the light provided by the backlight unit to the pixel in the second frame is less than the luminance of the light provided to the pixel by the backlight unit in the first frame Respectively.

The brightness of the second image displayed in the first frame may be zero or the brightness of the first image displayed in the second frame may be the maximum brightness.

According to an embodiment of the present invention, there is provided a method of driving a display device including a memory for storing gamma data for two or more gamma curves, a gradation voltage generator for generating a gradation voltage based on the gamma data, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, Displaying a first image along the first gamma curve during a first frame of a set of frames in which the pixel comprises two or more consecutive frames, During the second frame of the set of frames, The luminance of a step, and the first video image to display is no lower than the luminance of the second image, the second image is displayed in two successive frames.

Wherein the display panel includes a first pixel and a second pixel that are adjacent to each other and display an image corresponding to different input video signals, and each of the first pixel and the second pixel includes two or more consecutive frames Wherein an image corresponding to one input image signal during a frame set is displayed, and an image displayed by each of the first pixel and the second pixel during the frame set includes the first image and the second image, The gamma curve of the image displayed by the first pixel and the gamma curve of the image displayed by the second pixel may be different from each other.

Wherein each of the first sub-pixel and the second sub-pixel includes a first sub-pixel and a second sub-pixel, each of the first sub-pixel and the second sub-pixel corresponding to the input video signal during the one frame set, And the second image displayed by one of the first sub-pixel and the second sub-pixel may be displayed in two consecutive frames.

According to an embodiment of the present invention, there is provided a method of driving a display device, including: a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve; A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, And a backlight unit for supplying light to the display panel, wherein the pixel includes a first frame of a frame set including two or more consecutive frames, Displaying a first image along the first gamma curve during a frame, and Wherein the pixel displays a second image along the second gamma curve during a second frame of the frame set, the brightness of the first image is not lower than the brightness of the second image, and the backlight Wherein the first frame provides light of a first luminance to the display panel and the second frame provides light of a second luminance lower than the first luminance to the display panel.

The brightness of the second image displayed in the second frame is 0, and the backlight unit is turned off during the second frame so as not to provide light to the pixel.

The backlight may be turned on for a first time in the second frame to provide light to the pixel, and the duty ratio of the first time may be less than one.

According to an embodiment of the present invention, there is provided a method of driving a display device, including: a memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve; A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, And a backlight unit for supplying light to the display panel, wherein the pixel includes a first frame of a frame set including two or more consecutive frames, Displaying a second image along the second gamma curve during the frame, and Wherein the pixels display a first image along the first gamma curve during a second frame of the frame set, wherein the brightness of the first image is not less than the brightness of the second image, The luminance of the light provided by the backlight unit to the pixel in the frame is higher than the luminance of light provided to the pixel by the backlight unit in the first frame.

The brightness of the second image displayed in the first frame may be zero or the brightness of the first image displayed in the second frame may be the maximum brightness.

According to the embodiment of the present invention, the transmittance and lateral visibility of the display device can be improved and the display quality of the display device can be improved.

1 is a block diagram of a display device according to an embodiment of the present invention,
2 is a simplified circuit diagram of one pixel of a display device according to an embodiment of the present invention,
3 is a graph showing a gamma curve of a display device according to an embodiment of the present invention,
4, 5A, 5B, 5C, and 6 are diagrams illustrating the brightness of one pixel of the display device according to an embodiment of the present invention in frame order,
7 is a view showing two sub-pixels included in one pixel of a display device according to an embodiment of the present invention,
8 is an equivalent circuit diagram of one pixel of a display device according to an embodiment of the present invention,
9 is a plan view of one pixel of a display device according to an embodiment of the present invention,
10 is a cross-sectional view taken along line XX of the display device of FIG. 9,
11 is an equivalent circuit diagram of one pixel of a display device according to an embodiment of the present invention,
12A and 12B are plan views of one pixel of a display device according to an embodiment of the present invention,
13 is a cross-sectional view cut along the line XIII-XIII of the display device of Fig. 12A,
FIGS. 14, 15 and 16 are equivalent circuit diagrams of one pixel of a display device according to an embodiment of the present invention,
17 is a graph showing a gamma curve of a display device according to an embodiment of the present invention,
18A, 18B, 19A, 19B, 20A, 20B, 21A, 21B, 21C, 21D, 22A and 22B are schematic diagrams of a display device according to an embodiment of the present invention. The luminance along the gamma curve applied to the pixel is shown in frame order,
23 is a graph showing a gamma curve of a display device according to an embodiment of the present invention,
24A, 24B, 24C, 24D, 25A, 25B, 26A, 26B, 27A, 27B, 28A, 28B, 29A, 29B, 30A, FIG. 4 is a diagram illustrating a luminance according to a gamma curve applied to one pixel of a display device according to an embodiment of the present invention in frame order,
31A, 31B, 32A, 32B, 33A, and 33B are diagrams illustrating the luminance along the applied gamma curve of one pixel of the display device shown in FIG. 2 in frame order,
FIG. 34 is a diagram showing luminance according to a gamma curve applied to two neighboring pixels of a display device according to an embodiment of the present invention, in frame order, and FIG.
FIGS. 35 and 36 are diagrams illustrating luminance along a gamma curve applied to four neighboring pixels of a display device according to an embodiment of the present invention, in frame order,
37 is a graph showing a gamma curve of a display device according to an embodiment of the present invention,
38 and 39 are timing charts showing a driving method of a backlight unit of a display device according to an embodiment of the present invention,
FIGS. 40 and 41 are diagrams showing the gradation of the image and the brightness of the backlight portion, which the display device displays according to the input image signal, according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Now, a display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a display device according to an embodiment of the present invention.

1, a display device according to an exemplary embodiment of the present invention includes a display panel 300, a gate driver 400 and a data driver 500 connected to the display panel 300, a data driver 500, An associated gray scale voltage generator 800, a signal controller 600 for controlling the gray scale voltage generator 800, and a memory 650 connected to the signal controller 600.

The display panel 300 includes a plurality of signal lines connected to an equivalent circuit and a plurality of pixels PX arranged in the form of a matrix. When the display device according to an embodiment of the present invention is a liquid crystal display device, the display panel 300 includes a lower and upper panel (not shown) facing each other and a liquid crystal layer ). ≪ / RTI >

The signal line includes a plurality of gate lines (not shown) for transferring gate signals (also referred to as "scan signals") and a plurality of data lines (not shown) for transferring data signals.

The gate driver 400 is connected to the gate line to apply a gate signal Vg, which is a combination of the gate-on voltage Von and the gate-off voltage Voff, to the gate line.

The memory 650 is connected to the signal controller 600 to store the gamma data for the gamma curve, and then outputs the gamma data to the signal controller 600. The gamma curve is a curve showing the luminance or transmittance with respect to the gradation of the input image signal IDAT and can determine the gradation voltage or the reference gradation voltage based on the curve. The gamma data stored in the memory 650 may include gamma data for two or more different gamma curves. 1, the memory 650 may be included in the signal controller 600 or the gradation voltage generator 800, or may be included in the data driver 500. Referring to FIG.

The gradation voltage generator 800 generates the total gradation voltage related to the transmittance of the pixel PX or a limited number of gradation voltages (referred to as a reference gradation voltage). (Reference) gradation voltage may have a positive value and a negative value with respect to the common voltage Vcom. The gradation voltage generator 800 receives the gamma data from the signal controller 600 and generates the (reference) gradation voltage based on the gamma data.

The gradation voltage generator 800 may be included in the data driver 500.

The data driver 500 is connected to the data line and selects the gray scale voltage from the gray voltage generator 800 and applies it to the data line as a data voltage. However, when the gradation voltage generator 800 does not provide all of the gradation voltages but only provides a limited number of reference gradation voltages, the data driver 500 divides the reference gradation voltages to generate gradation voltages for all gradations It is also possible to select the data voltage among these.

The signal controller 600 controls operations of the gate driver 400 and the data driver 500 and the like. The signal controller 600 may further include a frame memory 660 that can store the input image signal IDAT in units of frames.

The display device according to an embodiment of the present invention may further include a backlight unit 900 and a backlight control unit 950 for providing light to the display panel 300 as shown in FIG.

The backlight control unit 950 receives the backlight control signal CONT4 from the signal controller 600 and controls the backlight unit 900 based on the backlight control signal CONT4. The backlight control signal CONT4 may include a PWM control signal for controlling the on time of part or all of the backlight unit 900. [

The display operation of such a display device will now be described.

The signal control unit 600 receives an input video signal IDAT and an input control signal ICON for controlling the display thereof. The input image signal IDAT contains the luminance information of each pixel PX and the luminance has a predetermined number, for example, 1024 (= 2 ¹⁰ ), 256 (= 2 ⁸ ), or 64 (= ²⁶ ) It has gray. Examples of the input control signal ICON include a vertical synchronization signal, a horizontal synchronization signal, a main clock signal, and a data enable signal.

The signal controller 600 processes the input video signal IDAT based on the input video signal IDAT and the input control signal ICON and converts the input video signal IDAT into an output video signal DAT and outputs the gate control signal CONT1, The control signal CONT2 and the gamma control signal CONT3. The signal controller 600 outputs the gate control signal CONT1 to the gate driver 400 and outputs the data control signal CONT2 and the output video signal DAT to the data driver 500. The gamma control signal CONT3, And outputs it to the voltage generator 800.

The gamma control signal CONT3 may include gamma data stored in the memory 650. [

The signal controller 600 may further generate the backlight control signal CONT4 and may control the backlight controller 900 to control the backlight controller 900 and the backlight controller 950. In this case, Can be exported.

The gradation voltage generator 800 generates a gradation voltage or a limited number of reference gradation voltages according to the gamma control signal CONT3 and outputs the gradation voltage to the data driver 500. [ The gradation voltages may be provided for different gamma curves, and a gradation voltage may be generated for the selected gamma curve through a separate selection process.

The data driver 500 receives the digital video signal DAT for the pixel PX of one row in accordance with the data control signal CONT2 from the signal controller 600 and outputs the digital video signal DAT corresponding to each digital video signal DAT Converts the digital video signal DAT to an analog data voltage Vd by selecting the gradation voltage, and applies it to the corresponding data line.

The frame frequency (also referred to as an input frequency or gamma frequency) at which the data driver 500 outputs the data voltage Vd to the data line and displays one image in each pixel PX is a video image May be different from an image frequency (also referred to as an output frequency) in units of two or more consecutive frames (referred to as a frame set) representing a frame. Specifically, the image frequency may be 1 / n (n is a natural number of 2 or more) of the frame frequency. For example, when the frame frequency is 120 Hz, the image frequency may be 60 Hz, and when the frame frequency is 240 Hz, the image frequency may be 60 Hz, 80 Hz, 120 Hz, and the like.

The gate driver 400 applies a gate-on voltage Von to the gate line according to the gate control signal CONT1 from the signal controller 600 and turns on a switching element connected to the gate line. Then, the data voltage applied to the data line is applied to the corresponding pixel PX through the turned-on switching element. When a data voltage is applied to the pixel PX, the pixel PX can display the luminance corresponding to the data voltage through the various optical conversion elements. For example, in the case of a liquid crystal display device, the degree of tilt of liquid crystal molecules in the liquid crystal layer can be controlled to adjust the polarization of light to display the luminance corresponding to the gradation of the input image signal IDAT. At this time, part or all of the backlight unit 900 may be turned on or off under the control of the backlight control unit 950 to provide light to the display panel 300.

This process is repeated in units of one horizontal period (also referred to as "1H ", which is the same as one cycle of the horizontal synchronization signal Hsync and the data enable signal DE) And applies a data voltage Vd to all the pixels PX to display an image of one frame.

When one frame ends, the next frame starts and the state of the inverted signal included in the data control signal CONT2 can be controlled so that the polarity of the data voltage applied to each pixel PX is opposite to the polarity in the previous frame ( Frame inversion). The polarity of the data voltage flowing through one data line may be periodically changed or the polarity of the data voltage applied to the data line of one pixel line may be different depending on the characteristics of the inverted signal even in one frame.

Hereinafter, a display apparatus and a driving method thereof according to an embodiment of the present invention will be described with reference to FIG. 1 and FIG. 2 to FIG.

FIG. 2 is a simplified circuit diagram of a pixel of a display device according to an embodiment of the present invention. FIG. 3 is a graph illustrating a gamma curve of a display device according to an embodiment of the present invention. FIGS. 4, 5A, 5B, 5C, and 6 are diagrams showing the brightness of one pixel of the display device according to the example in frame order. And luminance in accordance with the frame order.

2, a pixel PX included in a display device according to an exemplary embodiment of the present invention includes a switching element Q connected to a data line 171 and a gate line 121, (191). The switching element Q may be controlled according to a gate signal transmitted from the gate line 121 and may transmit the data voltage Vd transferred by the data line 171 to the pixel electrode 191. [

3, the gamma data included in the memory 650 or the data driver 500 of the display device according to an exemplary embodiment of the present invention includes a first gamma curve GH and a second gamma curve GL Gamma data. Here, the brightness of the image according to the first gamma curve GH may be higher than or equal to the brightness of the image according to the second gamma curve GL. One pixel PX is divided into a data voltage Vd and a second gamma curve GL according to the first gamma curve GH during one frame set consisting of two or more consecutive frames for one input video signal IDAT. (Vd) according to the data voltage (Vd). Therefore, as described above, the image frequency can be 1 / n (n is a natural number of 2 or more) of the frame frequency.

The first and second gamma curves GH and GL may be set such that the composite gamma curve at the front of the first and second gamma curves GH and GL is optimized for the front gamma curve For example, gamma curve Gf with a gamma value of 2.2) and the synthetic gamma curve at the side can be adjusted to be as close as possible to the front gamma curve Gf.

A specific driving method for improving lateral visibility using the first and second gamma curves GH and GL will be described in detail with reference to Figs. 4 to 6. Fig.

Referring first to FIG. 4, a pixel PX of a display device according to an embodiment of the present invention can be driven by using two consecutive frames as one frame set. For example, an image for the input image signal IDAT1 may be displayed in two successive frames 1F and 2F, and an image for the next input image signal IDAT2 may be displayed in the next two consecutive frames 3F and 4F. have.

One of two frames included in one frame set displays an image according to the first gamma curve GH (referred to as a first image H) and the other frame indicates an image corresponding to the second gamma curve GL 2 " image " L "). According to the time-divisional driving, the images according to different gamma curves in successive frames can be displayed, and the synthetic gamma curves at their sides can be made as close as possible to the front gamma curve Gf to improve the side viewability. In addition, since it is not necessary to divide one pixel PX, the transmittance can also be improved.

Particularly, as shown in FIG. 4, when the first image H is displayed in the first frame of the frame set for the input image signal IDAT1 and the second image L is displayed in the second frame, In the frame set for the video signal IDAT2, the second image L is displayed in the first frame and the first image H is displayed in the second frame. Similarly, in the frame set for the input image signal following the input image signal IDAT2, the first image H can be displayed before the second image L. [

If the order of displaying the first image (H) and the second image (L) in the continuous frame set is reversed, the second image (L) having a low luminance is displayed in successive frames. Can be compensated for. More specifically, the response speed (referred to as the falling response speed) when the tilted direction of the liquid crystal molecules changes from the higher luminance side to the lower luminance side of the image should be maintained at a certain level or higher, according to one embodiment of the present invention According to an embodiment of the present invention, since the second image L having a low luminance is displayed in two consecutive frames, the low gradation can be sufficiently displayed in time division driving The lateral visibility can be further improved.

Particularly, in one embodiment of the present invention, in order to maximize the visibility, it is necessary that the falling response speed of the liquid crystal molecules is fast. For example, when the image is changed from high luminance to low luminance, the falling response speed of the liquid crystal molecules when the luminance of the image changes from 99% to 1% of the luminance difference is less than 4.17 ms when the frame frequency is 240 Hz, It can be less than 8.3ms when the frame frequency is 120Hz.

Also, if the order of displaying the first image H and the second image L in the continuous frame set is reversed, the first image H having a high luminance can be displayed in successive frames as well. Therefore, when displaying a low-luminance image and then displaying a high-luminance image, a sufficient high gradation can be displayed by compensating the response speed of the liquid crystal molecules.

Referring to FIGS. 5A, 5B and 5C, the pixel PX according to the present embodiment can display an image for one input video signal IDAT with three consecutive frames as one frame set. For example, in the three consecutive frames 1F, 2F and 3F, an image for the input image signal IDAT1 is displayed, and for the next two consecutive frames 4F, 5F and 6F, the image for the next input image signal IDAT2 Can be displayed.

For example, as shown in FIG. 5A, the first frame of the three frames included in one frame set may display the first image H and the remaining two frames may display the second image L. At this time, since two consecutive frames display the second image L having low brightness, the slow response speed of the liquid crystal molecules of the liquid crystal display device can be compensated for, thereby further improving the lateral visibility, as described above.

As shown in FIG. 5B, the second image L having a low luminance is displayed continuously as long as the sequence of displaying the first image H and the second image L is reversed in successive frame sets, So that the first image H having a high luminance can be displayed in the frame.

The order in which the first image H and the second image L are arranged in a continuous frame set may be the same as shown in FIG. 5C. For example, the first frame and the last frame of the three frames included in one frame set may display the second image L, and the second frame may display the first image H. At this time, two consecutive frames between two neighboring frame sets display the second image L having low luminance, so that the slow response speed of the liquid crystal molecules of the liquid crystal display device can be compensated for, thereby further improving the lateral visibility. Also, since the first image H having a high luminance can be displayed in two consecutive frames, the slow response speed of the liquid crystal molecules can be compensated for when displaying an image with a high luminance at a low luminance.

Referring to FIG. 6, a pixel PX according to the present embodiment can display an image for one input video signal IDAT with four consecutive frames as one frame set. For example, in the four consecutive frames 1F, 2F, 3F and 4F, an image for the input video signal IDAT1 is displayed and in the next two consecutive frames 5F, 6F, 7F and 8F, the next input video signal IDAT2 ) Can be displayed. As shown in FIG. 6, the first frame of the four frames included in one frame set may display the first image H and the remaining three frames may display the second image L. At this time, since three consecutive frames display the second image L having a low brightness, the slow response speed of the liquid crystal molecules of the liquid crystal display device can be compensated as described above, thereby further improving the side viewability.

6, the second image L is displayed in consecutive six frames by reversing the order of displaying the first image H and the second image L in successive frame sets, The first image H may be displayed in two frames.

In addition, an image for one input video signal IDAT may be displayed with five or more consecutive frames as one frame set. At this time, frames of the second image L having a low luminance are consecutively maximized in one frame set, thereby sufficiently expressing the low gradation and further improving the side visibility.

Next, a display device according to an embodiment of the present invention will be described with reference to FIG.

7 is a diagram showing two sub-pixels included in one pixel of a display device according to an embodiment of the present invention.

Referring to FIG. 7, a pixel PX included in a display device according to an embodiment of the present invention may include a first sub-pixel PXa and a second sub-pixel PXb. The first subpixel PXa and the second subpixel PXb can display images having different brightnesses for one input video signal IDAT. That is, the first and second subpixels PXa and PXb display an image according to different gamma curves with respect to one input video signal IDAT, thereby improving lateral visibility, which is called space division driving. The areas of the first sub-pixel PXa and the second sub-pixel PXb may be equal to each other and the area of the second sub-pixel PXb may be larger than the area of the first sub-pixel PXa.

A specific structure according to various examples of the pixel PX will be described with reference to FIGS. 8 to 16. FIG.

First, a display device according to an embodiment of the present invention will be described with reference to FIGS. 8, 9 and 10. FIG.

9 is a plan view of one pixel of a display device according to an embodiment of the present invention, and Fig. 10 is a cross-sectional view of the display device of Fig. 9, Sectional view taken along line XX of FIG.

8, a display device according to an embodiment of the present invention includes a signal line including a gate line 121, a depression gate line 123, and a data line 171 as a liquid crystal display device and a pixel PX).

Each pixel PX includes first and second sub-pixels PXa and PXb. The first subpixel PXa includes a first switching device Qa, a first liquid crystal capacitor Clca and a first holding capacitor Csta. The second subpixel PXb includes a first switching device Qa, a first liquid crystal capacitor Clca, The second storage capacitors Csta and Cstb, and the reduced-pressure storage capacitor Cstd, in addition to the elements Qa, Qb, and Qc, the second liquid crystal capacitors Clca and Clcb,

The first and second switching elements Qa and Qb are connected to the gate line 121 and the data line 171 respectively and the third switching element Qc is connected to the voltage-

The first and second switching elements Qa and Qb are three terminal elements such as a thin film transistor and the control terminal thereof is connected to the gate line 121. The input terminal is connected to the data line 171, Terminals are connected to the first and second liquid crystal capacitors Clca and Clcb and the first and second storage capacitors Csta and Cstb, respectively.

The third switching element Qc is also a three terminal element such as a thin film transistor. The control terminal is connected to the depressurizing gate line 123, the input terminal is connected to the second liquid crystal capacitor Clcb, And is connected to the capacitor Cstd.

The decompression capacitor Cstd is connected to an output terminal of the third switching device Qc and a common voltage.

When the gate-on voltage Von is applied to the gate line 121, the first and second thin film transistors Qa and Qb connected thereto are turned on. The data voltage of the data line 171 is applied to the first and second liquid crystal capacitors Clca and Clcb through the turned on first and second switching devices Qa and Qb to be supplied to the first and second liquid crystal capacitors Clca and Clcb are charged with the difference between the data voltage Vd and the common voltage Vcom. At this time, the gate-off voltage Voff is applied to the decompression gate line 123.

Next, when the gate-off voltage Voff is applied to the gate line 121 and the gate-on voltage Von is applied to the decompression gate line 123, the first and second switching elements Qa , Qb are turned off, and the third switching element Qc is turned on. As a result, the charging voltage of the second liquid crystal capacitor Clcb connected to the output terminal of the second switching device Qb drops.

A case where the liquid crystal display according to the present embodiment is driven by a frame inversion and a data voltage Vd having a positive polarity is applied to the data line 171 in the current frame based on the common voltage Vcom is exemplified In other words, negative charge is accumulated in the decompression capacitor Cstd after the previous frame ends. When the third switching element Qc is turned on in the current frame, the positive charge of the second liquid crystal capacitor Clcb flows into the reduced-pressure accumulator Cstd via the third switching element Qc, The positive charge is collected and the charge voltage of the second liquid crystal capacitor Clcb is decreased. In the next frame, conversely, when the third switching element Qc is turned on in a state in which the negative charge is charged in the second liquid crystal capacitor Clcb, the negative charge of the second liquid crystal capacitor Clcb is The negative charge flows into the decompression capacitor Cstd and the voltage of the second liquid crystal capacitor Clcb falls.

As described above, according to the present embodiment, the charging voltage of the second liquid crystal capacitor Clcb can be made lower than the charging voltage of the first liquid crystal capacitor Clca irrespective of the polarity of the data voltage Vd. Therefore, the charging voltage of the first and second liquid crystal capacitors Clca and Clcb can be made different from each other, thereby improving lateral visibility of the liquid crystal display device.

A specific structure of the liquid crystal display device shown in Fig. 8 will now be described with reference to Figs. 9 and 10. Fig.

9 and 10, the liquid crystal display according to the present embodiment includes a lower panel 100 and an upper panel 200 facing each other, a liquid crystal layer 3 interposed between the two panels 100 and 200, . A polarizer (not shown) may be provided on the outer surface of the display panels 100 and 200.

First, the upper panel 200 will be described. An opposing electrode 270 is formed on the insulating substrate 210. The counter electrode 270 may be made of a transparent conductor such as ITO or IZO or a metal. An alignment film (not shown) may be formed on the counter electrode 270.

The liquid crystal layer 3 interposed between the lower panel 100 and the upper panel 200 includes liquid crystal molecules having dielectric anisotropy and the liquid crystal molecules are arranged such that their long axes are parallel to the surface of the two panels 100 and 200 As shown in Fig. The liquid crystal molecules of the liquid crystal layer 3 may be pretilted such that the long axis thereof is substantially parallel to the longitudinal direction of the fine branch portions 199a and 199b of the first and second sub-pixel electrodes 191a and 191b. To this end, the liquid crystal layer 3 may further comprise an alignment aid comprising a reactive mesogen.

Next, the lower display panel 100 will be described.

A plurality of gate conductors including a plurality of gate lines 121, a plurality of depressed gate lines 123 and a plurality of sustain electrode lines 125 are formed on an insulating substrate 110. [

The gate line 121 and the decompression gate line 123 extend mainly in the lateral direction and transfer gate signals. The gate line 121 may include a first gate electrode 124a and a second gate electrode 124b protruding upward and downward and the decompression gate line 123 may include a third gate electrode 124c protruding upwardly. have. The first gate electrode 124a and the second gate electrode 124b may be connected to each other to form one protrusion.

The sustain electrode line 125 can also extend mainly in the lateral direction and can be positioned directly above the gate line 121 and transmit a predetermined voltage such as the common voltage Vcom. The sustain electrode line 125 includes a sustain extension portion 126, a pair of vertical portions 128 that extend substantially vertically to the gate line 121, and a pair of vertical portions 128 But the structure of the sustain electrode line 125 is not limited thereto.

A gate insulating layer 140 is formed on the gate conductors 121, 123, and 125.

On the gate insulating film 140, a plurality of linear semiconductors 151, which can be made of amorphous or crystalline silicon, are formed. The linear semiconductor 151 mainly includes first and second semiconductors 154a and 154b that extend in the longitudinal direction and extend toward the first and second gate electrodes 124a and 124b and are connected to each other, And a third semiconductor 154c connected to the second semiconductor layer 154b.

A plurality of linear resistive ohmic contacts 161 are formed on the linear semiconductor 151. Resistive contact members 163a and 165a are formed on the first semiconductor 154a, And the third semiconductor 154c may also be formed with resistive contact members, respectively. The resistive contact member 165a may protrude from the linear resistive contact member 161. However, depending on the type of the semiconductor 151, the resistive contact members 161 and 165a may be omitted.

A plurality of data lines 171, a plurality of first drain electrodes 175a, a plurality of second drain electrodes 175b and a plurality of third drain electrodes 175c are formed on the resistive contact members 161 and 165a A data conductor is formed.

The data line 171 carries a data signal and extends mainly in the vertical direction and intersects the gate line 121 and the decompression gate line 123. Each data line 171 may include a first source electrode 173a and a second source electrode 173b extending toward the first gate electrode 124a and the second gate electrode 124b.

The first drain electrode 175a, the second drain electrode 175b, and the third drain electrode 175c may include a wide one end and a rod-shaped other end. The rod-shaped end portions of the first drain electrode 175a and the second drain electrode 175b are partially surrounded by the first source electrode 173a and the second source electrode 173b. The wide one end of the second drain electrode 175b may extend again to form a third source electrode 173c bent in a U-shape. The wide end portion 177c of the third drain electrode 175c overlaps with the sustaining extension portion 126 to form a reduced-pressure storage capacitor Cstd and the rod-end portion is partially surrounded by the third source electrode 173c.

Second and third source electrodes 173a / 173b / 173c and first / second / third drain electrodes 175a / 175b (corresponding to the first / second / third gate electrodes 124a / 124b / 124c, 175c together with the first / second / third semiconductors 154a / 154b / 154c form one first / second / third thin film transistor (TFT) Qa / Qb / Qc Channel of the thin film transistor is formed in each semiconductor 154a / 154b / 154c between each source electrode 173a / 173b / 173c and each drain electrode 175a / 175b / 175c.

A lower protective film 180p that can be made of an inorganic insulating material such as silicon nitride or silicon oxide is formed on portions of the data conductors 171, 175a, 175b, and 175c and exposed semiconductors 154a, 154b, and 154c.

The color filter 230 and the light shielding member 220 may be disposed on the lower protective film 180. The light shielding member 220 includes a portion covering the region where the first thin film transistor Qa, the second thin film transistor Qb and the third thin film transistor Qc are located and a portion extending along the data line 171 . The light shielding member 220 includes an opening 227 located on the first thin film transistor Qa and the second thin film transistor Qb, an opening 226a located on the wide end of the first drain electrode 175a, An opening 226b located above the wide end of the drain electrode 175b and an opening 228 located above the third thin film transistor Qc. Alternatively, at least one of the color filter 230 and the light shielding member 220 may be located on the upper panel 200.

The upper protective film 180q may be formed on the color filter 230 and the light shielding member 220. [

A plurality of contact holes 185a and 185b are formed in the lower protective film 180p and the upper protective film 180q to expose the first drain electrode 175a and the second drain electrode 175b, respectively. The contact holes 185a and 185b may be located in the openings 226a and 226b of the light shielding member 220. [

A pixel electrode including a first sub-pixel electrode 191a and a second sub-pixel electrode 191b is formed on the upper protective layer 180q.

The first and second sub-pixel electrodes 191a and 191b may be adjacent to each other in the column direction and the height of the second sub-pixel electrode 191b may be higher than the height of the first sub-pixel electrode 191a.

The overall shape of the first sub-pixel electrode 191a is a rectangle. The first sub-pixel electrode 191a has a rectangular shape, and includes an outer frame portion defining an outer frame, a ten-trunk portion 195a including a horizontal trunk portion and a vertical trunk portion therein, And a plurality of fine branch portions 199a extending obliquely outwardly from the projecting portions 195a. A fine slit 91a is located between neighboring fine branch portions 199a.

The overall shape of the second sub-pixel electrode 191b is also a quadrangle. The second sub-pixel electrode 191b has a rectangular shape, and includes an outer frame portion defining an outer frame, a ten-trunk portion 195b including a horizontal trunk portion and a vertical trunk portion therein, And a plurality of fine branch portions 199b extending obliquely outwardly from the projecting portions 195b. A fine slit 91b is located between neighboring fine branch portions 199b.

Each of the first sub-pixel electrode 191a and the second sub-pixel electrode 191b is divided into four sub-regions by the respective criss-crossing bases 195a and 195b. Referring to FIG. 9, each sub-region of the second sub-pixel electrode 191b may include a region where the interval between the fine branches 199b is different depending on the position, but the interval between the fine branches 199b Can be constant. The specific structure of the first and second sub-pixel electrodes 191a and 191b is not limited to the example shown in FIG. 9, and can be variously modified. The size of each portion is also determined by the cell gap, And so on.

The first sub-pixel electrode 191a receives a data voltage from the first drain electrode 175a through the contact hole 185a and the second sub-pixel electrode 191b receives a data voltage from the second drain electrode 175a through the contact hole 185b. The data voltage can be supplied from the data line 175b.

An alignment layer (not shown) may be formed on the first and second sub-pixel electrodes 191a and 191b and the upper passivation layer 180q.

The first and second sub-pixel electrodes 191a and 191b generate an electric field together with the opposing electrode 270 of the upper panel 200 so that the direction of the liquid crystal molecules in the liquid crystal layer 3 between the two electrodes 191 and 270 . The degree of change of the polarization of the light incident on the liquid crystal layer 3 varies depending on the degree of tilting of the liquid crystal molecules. The change of the polarization is caused by the change of the transmittance by the polarizer, and the liquid crystal display displays the image.

On the other hand, the sides of the fine branches 199a and 199b or the fine slits 91a and 91b included in the first and second sub-pixel electrodes 191a and 191b may distort the electric field and cause the fine branches 199a and 199b or fine A horizontal component perpendicular to the sides of the slits 91a and 91b is produced, and the oblique direction of the liquid crystal molecules is determined in a direction determined by the horizontal component. The liquid crystal molecules are initially tilted in the direction perpendicular to the sides of the fine branch portions 199a and 199b or the fine slits 91a and 91b but the neighboring fine branch portions 199a and 199b or the fine slits 91a and 91b, The liquid crystal molecules to be tilted in opposite directions to each other due to the direction of the horizontal component of the electric field due to the sides of the fine branches 199a and 199b or the fine slits 91a and 91b are narrow, , 199b) or in the direction parallel to the length direction of the fine slits (91a, 91b).

Since the first and second sub-pixel electrodes 191a and 191b include four sub-regions having different lengths of the micro branches 199a and 199a in the embodiment of the present invention, the liquid crystal molecules of the liquid crystal layer 3 The inclination direction becomes all four directions and the reference viewing angle of the liquid crystal display device can be increased.

The first sub pixel electrode 191a and the counter electrode 270 form a first liquid crystal capacitor Clca together with the liquid crystal layer 3 therebetween and the second sub pixel electrode 191b and the counter electrode 270 form a first liquid crystal capacitor The applied voltage is maintained even after the first and second thin film transistors Qa and Qb are turned off by forming the second liquid crystal capacitor Clcb together with the liquid crystal layer 3 therebetween.

The first and second sub-pixel electrodes 191a and 191b may overlap the sustain electrode line 125 to form the first and second storage capacitors Csta and Cstb.

The specific operation and the visibility improvement method of the liquid crystal display device according to the present embodiment follow the description with reference to FIG.

Next, a display device according to an embodiment of the present invention will be described with reference to FIGS. 11 to 13. FIG. The same reference numerals are given to the same constituent elements as those of the above-described embodiment, and the same explanations are omitted.

FIG. 11 is an equivalent circuit diagram of one pixel of a display device according to an embodiment of the present invention, FIGS. 12A and 12B are plan views of one pixel of a display device according to an embodiment of the present invention, Sectional view taken along the line XIII-XIII of the display device of Fig.

11, a display device according to an exemplary embodiment of the present invention includes a gate line 121 for transmitting a gate signal, a data line 171 for transmitting a data signal, a reference line for transmitting a reference voltage, The voltage line 178 includes a signal line and a pixel PX connected thereto.

Each pixel PX includes first and second sub-pixels PXa and PXb. The first sub-pixel PXa includes a first switching device Qa and a first liquid crystal capacitor Clca and the second sub-pixel PXb includes a second and a third switching devices Qa, Qb, Qc, And a second liquid crystal capacitor (Clca, Clcb).

The first switching device Qa and the second switching device Qb are connected to the gate line 121 and the data line 171 respectively and the third switching device Qc is connected to the output of the second switching device Qb Terminal and the reference voltage line 178, respectively.

The first switching element Qa and the second switching element Qb are three terminal elements such as a thin film transistor and the control terminal thereof is connected to the gate line 121 and the input terminal thereof is connected to the data line 171 The output terminal of the first switching device Qa is connected to the first liquid crystal capacitor Clca and the output terminal of the second switching device Qb is connected to the second liquid crystal capacitor Clcb and the third switching device Qc As shown in Fig.

The third switching element Qc is also a three terminal element such as a thin film transistor. The control terminal is connected to the gate line 121, the input terminal is connected to the second liquid crystal capacitor Clcb, (Not shown).

11, when a gate-on voltage Von is applied to the gate line 121, the first switching device Qa, the second switching device Qb, Then, the third switching element Qc is turned on. The data voltage applied to the data line 171 is applied to the first liquid crystal capacitor Clca and the second liquid crystal capacitor Clcb through the first switching device Qa and the second switching device Qb, The first liquid crystal capacitor Clca and the second liquid crystal capacitor Clcb are charged by the difference between the data voltage Vd and the common voltage Vcom. At this time, the same data voltage (Vd) is transferred to the first liquid crystal capacitor (Clcb) and the second liquid crystal capacitor (Clcb) through the first and second switching devices (Qa, Qb) The charging voltage becomes a partial pressure through the third switching element Qc. Accordingly, since the charging voltage of the second liquid crystal capacitor Clcb becomes smaller than the charging voltage of the first liquid crystal capacitor Clca, the luminance of the two sub-pixels PXa and Pxb can be changed. Therefore, by appropriately adjusting the voltage charged in the first liquid crystal capacitor Clca and the voltage charged in the second liquid crystal capacitor Clcb, the image viewed from the side can be made as close as possible to the image viewed from the front, Side visibility can be improved.

A specific structure of the liquid crystal display device according to the embodiment shown in FIG. 11 will now be described with reference to FIGS. 12A and 13. FIG.

12A and 13, the liquid crystal display device according to the present embodiment includes a lower panel 100 and an upper panel 200 facing each other, a liquid crystal layer 3 interposed between the two panels 100 and 200 And a pair of polarizers (not shown) attached to the outer surfaces of the display panels 100 and 200.

First, the lower display panel 100 will be described. A gate line 121 is positioned on the insulating substrate 110. The gate line 121 includes a first gate electrode 124a, a second gate electrode 124b, and a third gate electrode 124c.

The gate insulating film 140 is positioned on the gate line 121 and the first semiconductor 154a, the second semiconductor 154b and the third semiconductor 154c are positioned thereon.

A plurality of resistive contact members 163a, 165a, 163b, 165b, 163c, and 165c may be disposed on the first semiconductor 154a, the second semiconductor 154b, and the third semiconductor 154c.

A plurality of data lines 171 including a first source electrode 173a and a second source electrode 173b are formed on the resistive contact members 163a, 165a, 163b, 165b, 163c, and 165c and the gate insulating film 140, The data conductors 171, 173c, 175a, and 175c including the first drain electrode 175a, the second drain electrode 175b, the third source electrode 173a, and the third drain electrode 175c, and the reference voltage line 178, 175b, 175c, 178 are located.

The reference voltage line 178 may include two line bases 178a substantially parallel to the data line 171 and a connecting portion 178b connecting the two line bases 178a to each other. The delay of the signal flowing through the reference voltage line 178 can be prevented by connecting the two line portions 178a of the reference voltage line 178 to the connecting portion 178b. However, the shape of the reference voltage line 178 is not limited to this, and can be variously modified.

The first gate electrode 124a, the first source electrode 173a and the first drain electrode 175a together with the first semiconductor 154a form the first thin film transistor Qa and the second gate electrode 124b The second source electrode 173b and the second drain electrode 175b together with the second semiconductor 154b form the second thin film transistor Qb and the third gate electrode 124c, The second drain electrode 173c and the third drain electrode 175c may form the third thin film transistor Qc together with the third semiconductor 154c.

The passivation layer 180 may be located on portions of the data conductors 171, 173c, 175a, 175b, 175c, and 177 and exposed semiconductors 154a, 154b, and 154c. The passivation layer 180 may include a plurality of contact holes 185a and 185b that expose the first drain electrode 175a and the second drain electrode 175b.

The pixel electrode 191 including the first sub-pixel electrode 191a and the second sub-pixel electrodes 191a and 191b is located on the passivation layer 180. [

The pixel electrode 191 may include a first side parallel to the gate line 121 and a second side parallel to the data line 171. The first side parallel to the gate line 121 may be longer than the second side parallel to the data line 171. In this case, since the number of data lines 171 located on the display panel 300 can be reduced, the number of data driving circuit chips included in the data driver 500 can be reduced.

The first sub-pixel electrode 191a and the second sub-pixel electrode 191b may be adjacent to each other in the horizontal direction. Each of the first and second sub-pixel electrodes 191a and 191b may include a cross stripe portion 195 and a plurality of fine branches 199.

The first sub-pixel electrode 191a and the second sub-pixel electrode 191b are physically and electrically connected to the first drain electrode 175a and the second drain electrode 175b through contact holes 185a and 185b, respectively And a data voltage can be applied from the first drain electrode 175a and the second drain electrode 175b. At this time, a part of the data voltage applied to the second drain electrode 175b is divided through the third source electrode 173c so that the magnitude of the voltage applied to the second sub-pixel electrode 191b is smaller than that of the first sub-pixel electrode 191a May be less than the magnitude of the voltage applied to the gate.

The area of the second sub-pixel electrode 191b may be equal to or larger than the area of the first sub-pixel electrode 191a.

On the other hand, the voltage applied to the reference voltage line 178 may be greater than the common voltage Vcom, and the absolute value of the difference may be about 1V to about 4V.

The shielding member 220 and the color filter 230 may be disposed on the insulating substrate 210. [ At least one of the light shielding member 220 and the color filter 230 may be located on the lower panel 100.

The overcoat 250 may be disposed on the color filter 230 and the light shielding member 220, but the cover film 250 may be omitted.

A counter electrode 270 is formed on the cover film 250.

On both sides of the display panels 100 and 200, alignment films are formed and they may be vertical alignment films.

The image display method of the liquid crystal layer 3 including the liquid crystal molecules 31 and the pixel PX is similar to the above-described embodiment, and a detailed description thereof will be omitted.

12B, the display device according to an embodiment of the present invention is substantially the same as the embodiment shown in FIG. 12A described above, but the gate line 121 extends in the horizontal direction and the data line 171 extends in the vertical direction And cross the gate line 121.

The side of the pixel electrode 191 which is substantially parallel to the side gate line 121 may be shorter than the side substantially parallel to the data line 171. The first sub-pixel electrode 191a and the second sub-pixel electrode 191b may be adjacent to each other in the vertical direction.

Next, a display device according to an embodiment of the present invention will be described with reference to FIG.

14, a display device according to an exemplary embodiment of the present invention includes a signal line including first and second data lines 171a and 171b and a gate line 121, and a pixel PX connected thereto.

Each pixel PX includes first and second sub-pixels PXa and PXb. The first sub-pixel PXa includes a first switching device Qa, a first liquid crystal capacitor Clca and a first holding capacitor Csta. The second sub-pixel PXb includes a second switching device Qb, A second liquid crystal capacitor Clcb, and a second storage capacitor Cstb.

The first switching element Qa includes a control terminal connected to the gate line 121 and an input terminal connected to the first data line 171a. The output terminal of the first switching device Qa is connected to the first liquid crystal capacitor Clca and the first holding capacitor Csta.

The second switching element Qb includes a control terminal connected to the gate line 121 and an input terminal connected to the second data line 171b. The output terminal of the second switching device Qb is connected to the second liquid crystal capacitor Clcb and the second holding capacitor Cstb.

The first liquid crystal capacitor Clca and the second liquid crystal capacitor Clcb are connected to the data lines 171a and 171b through the first and second switching elements Qa and Qb connected to the data lines 171a and 171b, And receive different data voltages Vd.

Referring to FIG. 15, a display device according to the present embodiment includes a data line 171, a signal line including the first and second gate lines 121a and 121b, and a pixel PX connected thereto. Each pixel PX includes first and second sub-pixels PXa and PXb.

The first switching element Qa included in the first subpixel PXa includes a control terminal connected to the first gate line 121a and an input terminal connected to the data line 171. [ The output terminal of the first switching device Qa is connected to the first liquid crystal capacitor Clca and the first holding capacitor Csta.

The second switching element Qb includes a control terminal connected to the second gate line 121b and an input terminal connected to the data line 171. [ The output terminal of the second switching device Qb is connected to the second liquid crystal capacitor Clcb and the second holding capacitor Cstb.

The first liquid crystal capacitor Clca and the second liquid crystal capacitor Clcb are connected to the data lines 171 through the first and second switching devices Qa and Qb connected to the different gate lines 121a and 121b The different data voltages Vd for the input video signal IDAT can be supplied at different times.

Referring to FIG. 16, a display device according to the present embodiment includes a signal line including a data line 171 and a gate line 121 and a pixel PX connected thereto. Each pixel PX may include a coupled capacitor Ccp connected between the first and second sub-pixels PXa and PXb and the two sub-pixels PXa and PXb.

The first subpixel PXa includes a switching element Q connected to the gate line 121 and the data line 171 and a first liquid crystal capacitor Clca and a first holding capacitor Csta connected to the switching element Q, The second sub-pixel PXb includes a second liquid crystal capacitor Clcb connected to the coupled capacitor Ccp.

The control terminal of the switching element Q is connected to the gate line 121. The input terminal of the switching element Q is connected to the data line 171. The output terminal of the switching element Q is connected to the first liquid crystal capacitor Clca, And the combined capacitor Ccp. The switching element Q transfers the data voltage Vd of the data line 171 to the first liquid crystal capacitor Clca and the coupled capacitor Ccp in accordance with the gate signal from the gate line 121, Can change the magnitude of this voltage and transmit it to the second liquid crystal capacitor Clcb. The voltage Va charged in the first liquid crystal capacitor Clca and the voltage Vb charged in the second liquid crystal capacitor Clcb may have the following relationship.

Vb = Va 占 [Ccp / (Ccp + Clcb)]

Where Ccp is the capacitance of the combined capacitor (Ccp), and Clcb is the capacitance of the second liquid crystal capacitor (Clcb). Therefore, the voltage Vb charged in the second liquid crystal capacitor Clcb can always be smaller than the voltage Va charged in the first liquid crystal capacitor Clca. The first liquid crystal capacitor Clca can improve the lateral visibility by adjusting the ratio of the charging voltage Va and the charging voltage Vb of the second liquid crystal capacitor Clcb by properly adjusting the electrostatic capacity of the coupled capacitor Ccp .

Now, a display device and a driving method thereof according to an embodiment of the present invention will be described with reference to FIGS. 17 to 22B. FIG.

17 is a graph showing a gamma curve of a display device according to an embodiment of the present invention. Figs. 18A, 18B, 19A, 19B, 20A, 20B, 21A, 21B, 21C, 21D FIGS. 22A and 22B are diagrams illustrating luminance along a gamma curve applied to one pixel of a display device according to an embodiment of the present invention, in frame order. FIG.

Referring to FIG. 17, the gamma data included in the memory 650 or the data driver 500 of the display device according to an exemplary embodiment of the present invention may include gamma data for at least three gamma curves. In particular, the gamma data according to an embodiment of the present invention may include gamma data for the first gamma curve GH, the second gamma curve GL, and the third gamma curve GM. Here, the luminance of the image according to the first gamma curve GH may be higher or equal to the luminance of the image according to the third gamma curve GM, and the luminance of the image according to the third gamma curve GM may be equal to or lower than the luminance of the second gamma curve GM. May be higher than or equal to the luminance of the image according to the luminance level (GL).

In one embodiment of the present invention, one pixel PX may receive one data voltage Vd as in the embodiment shown in FIG. 2 described above, And may include a first subpixel PXa and a second subpixel PXb. One pixel PX or the first and second subpixels PXa are each composed of two or more consecutive frames for one input image signal IDAT, i.e., a first gamma curve GH during each frame of one frame set, , The second gamma curve (GL), and the third gamma curve (GM), to display an image. At this time, the image displayed during one frame set by the pixel PX or the first and second sub-pixels PXa and PXb necessarily includes the image according to the first gamma curve GH and the second gamma curve GL .

The first to third gamma curves GH, GL and GM are generated by applying a composite gamma curve of an image displayed during one frame set by the first and second sub-pixels PXa and PXb to the display device And the synthetic gamma curve at the side can be adjusted so as to be as close as possible to the front gamma curve Gf. At this time, the first to third gamma curves GH, GL, and GM may be selected so that the synthetic gamma curve does not have the inflexion point as close as possible to the front gamma curve Gf, thereby improving the display quality.

For example, the first gamma curve GH gradually increases in luminance from the lowest gradation to the vicinity of the middle gradation, and can display the highest luminance in the vicinity of the middle gradation. The second gamma curve GL, on the other hand, exhibits the lowest luminance from the lowest gradation to the vicinity of the middle gradation, and gradually increases above the mid-gradation level to reach the highest luminance at the highest gradation. The third gamma curve (GM) shows the lowest luminance from the lowest gradation to the vicinity of the middle gradation, and the luminance rises abruptly in the vicinity of the middle gradation, and the highest luminance can be exhibited in the higher gradations.

According to one embodiment of the present invention, the spatial division driving and the time division driving are applied together to display images according to different gamma curves for one input image signal IDAT through the two sub-pixels PXa and PXb during one frame And each of the subpixels PXa and PXb can display an image according to a different gamma curve in a continuous frame. Therefore, the composite gamma curve at the side during the frame set including two or more consecutive frames for the two sub-pixels PXa and PXb can be made as close as possible to the front gamma curve Gf, thereby improving the side viewability.

In addition, even when one pixel PX is not divided, images according to three or more gamma curves different from each other for one input video signal IDAT can be displayed in consecutive frames, so that a frame including two or more consecutive frames The side view visibility can be improved by variously adjusting the gamma curve so that the composite gamma curve at the side during the frame set is as close as possible to the front gamma curve Gf.

Then, by using the first to third gamma curves GH, GL, GM as shown in Fig. 17 or the first and second gamma curves GH, GL as shown in Fig. 3, An example of a specific driving method will be described in detail with reference to Figs. 18A to 22B.

The pixel PX of the display device according to an embodiment of the present invention can be driven by using two or more consecutive frames as one frame set. For example, in the two or more consecutive frames 1F and 2F, an image for the input image signal IDAT1 is displayed. In the next two or more consecutive frames 3F and 4F, the image for the next input image signal IDAT2 Can be displayed. Although the embodiments shown in Figs. 18A and 22B show an example in which one frame set includes two frames, the number of frames included in one frame set may be three or more.

18A and 18B, in one of two frames included in one frame set, the first sub-pixel PXa displays a first image H according to the first gamma curve GH, The pixel PXb can display the third image M according to the third gamma curve GM and the first subpixel PXa can display the second image M according to the second gamma curve GL (L) and the second sub-pixel (PXb) can display the second image (L). According to the present embodiment, space division driving and time division driving are applied together to display an image according to different gamma curves for one input image signal IDAT through two sub-pixels PXa and PXb during one frame, The sub-pixels PXa and PXb can display images according to different gamma curves in successive frames. Therefore, the composite gamma curve at the side during the frame set including two or more consecutive frames for the two sub-pixels PXa and PXb can be made as close as possible to the front gamma curve Gf, thereby improving the side viewability.

Particularly, as shown in FIG. 18B, in the first frame of the frame set for the input video signal IDAT1, the first subpixel PXa displays the first image H and the second subpixel PXb displays 3 images M and the first subpixel PXa and the second subpixel PXb display the second image L in the second frame, a frame for the next input video signal IDAT2, The first subpixel PXa and the second subpixel PXb display the second image L in the first frame and the first subpixel PXa displays the first image H in the second frame. And the second sub-pixel PXb displays the third image M. [ That is, if the order of the images displayed by the pixels PX in the neighboring two frame sets is reversed, the second image L having a low luminance is displayed in successive frames, and the first image H having a high luminance is displayed as a continuous frame It is possible to compensate for the slow response speed of the liquid crystal molecules as described above, so that the lateral visibility can be further improved.

Referring to FIGS. 19A and 19B, the first subpixel PXa displays the first image H and the second subpixel PXb displays the second image PXb in one of two frames included in one frame set The first subpixel PXa may display the third image M and the second subpixel PXb may display the second image L in the other frame. In this embodiment as well, the lateral visibility can be improved as in the embodiment shown in Figs. 18A and 18B described above. In particular, as shown in FIG. 19B, when the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second image L having a low luminance with respect to the second sub- A second image L and a third image M with relatively low luminance are displayed in consecutive frames with respect to the first subpixel PXa and a first image H having a high luminance is displayed on a continuous frame The slow response speed of the liquid crystal molecules can be compensated and the side visibility can be further improved.

Referring to FIGS. 20A and 20B, the first subpixel PXa displays the second image L and the second subpixel PXb displays the first image L in one of two frames included in one frame set The first subpixel PXa may display the third image M and the second subpixel PXb may display the second image L in the other frame. In this embodiment as well, the lateral visibility can be improved as in the embodiment shown in Figs. 18A and 18B described above. In particular, as shown in FIG. 20B, if the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second image L having a low luminance with respect to the second sub- The first image H having a high luminance is displayed in a continuous frame and the second image L having a low luminance is displayed in a continuous frame with respect to the first sub-pixel PXa, The speed can be compensated and the side visibility can be further improved.

Referring to FIGS. 21A and 21B, a first subpixel PXa indicates a first image H and a second subpixel PXb indicates a third image HP in one of two frames included in one frame set The first subpixel PXa may display the third image M and the second subpixel PXb may display the second image L in the other frame. 21C and 21D, the first subpixel PXa indicates the first image H and the second subpixel PXb indicates the first image H in one of the two frames included in one frame set The first subpixel PXa may display the second image L and the second subpixel PXb may display the third image M in the other frame have. In this embodiment as well, the lateral visibility can be improved as in the embodiment shown in Figs. 18A and 18B described above. In particular, as shown in FIGS. 21B and 21D, when the order of the images displayed by the pixels PX is reversed in the two sets of frames adjacent to each other, the second image L having a low luminance with respect to the second sub-pixel PXb A third image M having a relatively low luminance with respect to the first sub-pixel PXa is displayed in successive frames, and a first image H having a high luminance is displayed in a continuous frame. The slow response speed of the liquid crystal molecules can be compensated and the lateral visibility can be further improved.

Referring to FIGS. 22A and 22B, a first subpixel PXa indicates a third image M and a second subpixel PXb indicates a first image PXb in one of two frames included in one frame set The first subpixel PXa may display the third image M and the second subpixel PXb may display the second image L in the other frame. In this embodiment as well, the lateral visibility can be improved as in the embodiment shown in Figs. 18A and 18B described above. In particular, as shown in FIG. 22B, when the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second image L having a low luminance with respect to the second sub- Since the first image H having a high luminance can be displayed in a continuous frame, the slow response speed of the liquid crystal molecules can be compensated and the lateral visibility can be further improved.

In addition, the gamma curves of the two subpixels PXa and PXb followed by the images displayed in one frame set can be variously selected from among the first to third gamma curves GH, GL and GM described above. 18A to 22B, one frame set may include three or more consecutive frames, and in this case, images according to the first to third gamma curves GH, GL, GM may be arranged in various ways .

When the first and second gamma curves GH and GL as shown in FIG. 3 are used in the space division driving, the third image M shown in FIGS. 18A to 22B corresponds to the second image M shown in FIG. And the second image L according to the gamma curve GL.

Now, a display device and a driving method thereof according to an embodiment of the present invention will be described with reference to FIGS. 23 to 30B. FIG.

FIG. 23 is a graph showing a gamma curve of a display device according to an embodiment of the present invention. FIGS. 24A, 24B, 24C, 24D, 25A, 25B, 26A, 26B, 27A, And FIGS. 28A, 28B, 29A, 29B, 30A and 30B are diagrams illustrating luminance along a gamma curve applied to one pixel of a display device according to an embodiment of the present invention, in frame order to be.

Referring to FIG. 23, the gamma data included in the memory 650 or the data driver 500 of the display device according to an exemplary embodiment of the present invention may include gamma data for four different gamma curves. More specifically, the gamma data according to an exemplary embodiment of the present invention includes gamma data for the first gamma curve GH, the second gamma curve GL, the third gamma curve GM1, and the fourth gamma curve GM2 And may include gamma data for five or more gamma curves. Here, the brightness of the image according to the first gamma curve GH may be higher than or equal to the brightness of the image according to the third gamma curve GM1, and the brightness of the image according to the third gamma curve GM1 may be equal to or lower than the brightness of the fourth gamma curve GM1. And the brightness of the image according to the fourth gamma curve GM2 may be higher than or equal to the brightness of the image according to the second gamma curve GL.

Also in this embodiment, one pixel PX may include a first subpixel PXa and a second subpixel PXb according to various embodiments shown in FIGS. 7 to 16 described above. Each of the first and second subpixels PXa includes first to fourth gamma curves GH, GL, and GM1 for each of two or more consecutive frames for one input video signal IDAT, , GM2) according to the data voltage (Vd). At this time, the image displayed during the one frame set by the first and second sub-pixels PXa and PXb may include the image according to the first gamma curve GH and the second gamma curve GL.

The first to fourth gamma curves GH, GL, GM1 and GM2 are displayed by the first and second sub-pixels PXa and PXb to improve the side visibility. Gamma curve Gf determined to be most suitable for the apparatus and the synthetic gamma curve at the side can be adjusted to be as close as possible to the front gamma curve Gf. At this time, the first to fourth gamma curves GH, GL, GM1, and GM2 may be selected so that the synthetic gamma curve does not have the inflexion point as close as possible to the front gamma curve Gf, thereby improving the display quality. Since the present embodiment uses four gamma curves GH, GL, GM1 and GM2, it is easy to adjust the synthesized gamma curve to be closer to the front gamma curve Gf in comparison with the embodiment using three gamma curves Do.

For example, the first gamma curve GH gradually increases in luminance from the lowest gradation to the vicinity of the middle gradation, and can display the highest luminance in the vicinity of the middle gradation. The second gamma curve GL, on the other hand, exhibits the lowest luminance from the lowest gradation to the vicinity of the N / 3 gradation (N is the highest gradation), and gradually increases above the vicinity of the N / 3 gradation to reach the highest luminance can do. The third gamma curve GM1 exhibits the lowest luminance from the lowest gradation to the vicinity of the middle gradation. The luminance rises abruptly in the vicinity of the middle gradation, and the highest luminance can be exhibited in the higher gradations. The fourth gamma curve GM2 also has the lowest luminance from the lowest gradation to the vicinity of the middle gradation. The luminance increases to the maximum luminance in the vicinity of the middle gradation, but the rising gradation may be smaller than the third gamma curve GM1.

An example of a specific driving method for improving lateral visibility using the first to fourth gamma curves GH, GL, GM1 and GM2 will now be described in detail with reference to FIGS. 24A to 30B.

The pixel PX of the display device according to an embodiment of the present invention can be driven by using two or more consecutive frames as one frame set. For example, as shown in FIGS. 24A to 26B, an image for the input video signal IDAT1 is displayed in two consecutive frames 1F and 2F, and a next input is displayed in consecutive two frames 3F and 4F. An image for the video signal IDAT2 can be displayed.

As shown in FIGS. 27A to 30B, in the three consecutive frames 1F, 2F and 3F, an image for the input video signal IDAT1 is displayed and in the next three consecutive frames 4F, 5F and 6F It is possible to display an image for the next input video signal IDAT2. However, the number of frames included in one frame set may be changed differently. When a set of frames contains more than two frames, the number of frames that can be adjusted so that the composite gamma curve at the side is closer to the front gamma curve (Gf) increases the point at which the gamma curve can be adjusted, Can be further improved.

24A and 24B, the first subpixel PXa in one of two frames included in one frame set displays a first image H according to the first gamma curve GH, The pixel PXb can display the third image M1 according to the third gamma curve GM1 and the first subpixel PXa can display the fourth image M1 according to the fourth gamma curve GM2 in the other frame, And the second sub-pixel PXb may display the second image L according to the second gamma curve GL. As shown in FIGS. 24C and 24D, the first subpixel PXa displays the first image H along the first gamma curve GH in one of two frames included in one frame set, The second subpixel PXb can display the third image M1 according to the third gamma curve GM1 and the first subpixel PXa in the remaining one frame can display the third image M1 according to the second gamma curve GL. 2 image L and the second subpixel PXb may display the fourth image M2 according to the fourth gamma curve GM2. In particular, as shown in FIGS. 24B and 24D, when the order of the images displayed by the pixels PX is reversed in the two sets of frames adjacent to each other, the second image L having a low luminance with respect to the second sub-pixel PXb The fourth image M2 having a relatively low luminance with respect to the first sub-pixel PXa displayed in successive frames is displayed in successive frames and the first image H having a high brightness can be displayed in successive frames The slow response speed of the liquid crystal molecules can be compensated and the lateral visibility can be further improved.

Referring to FIGS. 25A and 25B, the first subpixel PXa represents the third image M1 and the second subpixel PXb represents the first image Ml in one of two frames included in one frame set The first subpixel PXa may display the fourth image M2 and the second subpixel PXb may display the second image L in the other frame. In particular, as shown in FIG. 25B, if the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second image L having a low luminance with respect to the second sub- The first image H having a high luminance is displayed in a continuous frame and the fourth image M2 having a relatively low luminance is displayed in a continuous frame with respect to the first sub-pixel PXa. The slow response speed can be compensated and the lateral visibility can be further improved.

Referring to FIGS. 26A and 26B, the first subpixel PXa represents the third image M1 and the second subpixel PXb represents the fourth image The first subpixel PXa may display the first image H and the second subpixel PXb may display the second image L in the other frame. In particular, as shown in FIG. 26B, if the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second images L having a low luminance with respect to the second sub-pixels PXb are sequentially And the first image H having a high luminance can be displayed in successive frames as well as the third image M1 having a relatively low luminance with respect to the first sub-pixel PXa, Can be compensated for and the side visibility can be further improved.

27A and 27B, in one of the three frames included in one frame set, the first subpixel PXa displays the first image H and the second subpixel PXb displays the third image H The first subpixel PXa may display the fourth image M2 and the second subpixel PXb may display the second image L in one frame, The first subpixel PXa and the second subpixel PXb can display the second image L in the frame. In particular, as shown in FIG. 27B, when the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second images L having a low luminance with respect to the second sub- Since the first image H displayed in at least two frames in which the second image L having a low luminance is displayed in the first subpixel PXa and the first image H in which the luminance is low can also be displayed in a continuous frame, The slow response speed of the molecule can be compensated and the lateral visibility can be further improved.

28A and 28B, in one of the three frames included in one frame set, the first subpixel PXa displays the first image H and the second subpixel PXb displays the second image H The first subpixel PXa may display the third image M1 and the second subpixel PXb may display the second image L in one frame, The first subpixel PXa may display the fourth image M2 and the second subpixel PXb may display the second image L in the frame. In particular, as shown in FIG. 28B, when the order of the images displayed by the pixels PX is reversed in the two sets of frames adjacent to each other, the fourth image M2 having a relatively low luminance with respect to the first sub- The first image H displayed in at least two frames and having a high luminance can be displayed in a continuous frame, so that the slow response speed of the liquid crystal molecules can be compensated and the lateral visibility can be further improved.

29A and 29B, in one of the three frames included in one frame set, the first subpixel PXa displays the first image H and the second subpixel PXb displays the second image H The first subpixel PXa may display the third image M1 and the second subpixel PXb may display the fourth image M2 in one frame, The first subpixel PXa and the second subpixel PXb can display the second image L in the frame. In particular, as shown in FIG. 29B, when the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed, the second images L having low luminance with respect to the second sub- Since the second image L having a low luminance can be displayed in two consecutive frames and the first image H having a high luminance can be displayed in a continuous frame even for the first subpixel PXa displayed in the frame, Can be compensated for and the side visibility can be further improved.

30A and 30B, in one of three frames included in one frame set, the first subpixel PXa displays the first image H and the second subpixel PXb displays the third image H The first subpixel PXa may display the third image M1 and the second subpixel PXb may display the fourth image M2 in one frame, The first subpixel PXa and the second subpixel PXb can display the second image L in the frame. In particular, as shown in FIG. 30B, when the order of the images displayed by the pixels PX is reversed in the two sets of frames adjacent to each other, the second image L having a low luminance with respect to the second sub- Since the second image L having a low luminance can be displayed in two consecutive frames and the first image H having a high luminance can be displayed in a continuous frame even for the first subpixel PXa displayed in the frame, Can be compensated for and the side visibility can be further improved.

In addition, the gamma curve followed by the image displayed in one frame set for the two subpixels PXa and PXb can be variously selected from among the first to fourth gamma curves GH, GL, GM1 and GM2 described above.

Also, in the case where one pixel PX receives one data voltage as described above with reference to FIG. 2 without dividing the pixel PX into two sub-pixels PXa and PXb, It is also possible to perform time division driving using three or more gamma curves as shown in FIG. A method of driving a display device according to an embodiment of the present invention will be described with reference to FIGS. 31A to 33B. FIG.

FIGS. 31A, 31B, 32A, 32B, 33A, and 33B are diagrams showing the luminance according to the applied gamma curve of one pixel of the display device shown in FIG.

Referring to FIGS. 31A and 31B, the pixel PX of the display device according to the embodiment of the present invention can be driven similar to the embodiment shown in FIGS. 5A and 5B described above, Gamma curves (GH, GL, GM) can be used.

Specifically, a frame in which the third image M corresponding to the third gamma curve GM is displayed may be positioned between two frames in which the first image H and the second image L are displayed. When the second image L having a low luminance is displayed after the first image H having a high luminance is displayed, the third image M corresponding to the intermediate luminance is displayed in the middle of the display of the second image L, It is possible to obtain a pretilt effect which can be suppressed and can further accelerate the drop response speed of the liquid crystal molecules.

32A and 32B, the pixel PX of the display device according to an embodiment of the present invention can be driven similarly to the embodiment shown in FIG. 6 described above, but in FIGS. 31A and 31B and FIGS. A frame in which the third image M corresponding to the third gamma curve GM is displayed may be positioned between two frames in which the first image H and the second image L are displayed, same. In particular, if the order of the images displayed by the pixels PX in the two neighboring frame sets is reversed as shown in FIG. 32B, the second images L having low luminance are displayed in consecutive frames and the first images H having high luminance Since it can be displayed in a continuous frame, the slow response speed of the liquid crystal molecules can be further compensated.

33A and 33B, the pixel PX of the display device according to an embodiment of the present invention may be driven similar to the embodiment shown in FIG. 6 described above, (GH, GL, GM1, GM2) may be used.

Specifically, a third image M1 and a fourth image M2 corresponding to a third gamma curve GM1 and a fourth gamma curve GM2 are displayed between two frames in which the first image H and the second image L are displayed, And a frame indicating the second frame M2 may be sequentially positioned. When the second image L having a low luminance is displayed after the first image H having a high luminance is displayed, the third image M1 and the fourth image M2 corresponding to the intermediate luminance are displayed in the middle of the second image L, By sequentially displaying them, the drop response speed of the liquid crystal molecules can be further increased.

34 to 36, a method of driving a display device according to an embodiment of the present invention will be described.

FIG. 34 is a view showing a luminance according to a gamma curve applied to two neighboring pixels of a display device according to an embodiment of the present invention, in frame order, and FIGS. 35 and 36 are graphs In accordance with a frame sequence, luminance according to a gamma curve applied to four neighboring pixels of a display device according to an embodiment of the present invention.

Referring to FIG. 34, a pixel PX included in a display device according to an embodiment of the present invention may include first and second sub-pixels PXa and PXb, It may not be. The first pixel PX1 and the second pixel PX2 may be two pixels adjacent to each other in the row or column direction on the display panel 300 and displaying different input video signals IDAT.

The first and second pixels PX1 and PX2 can display an image corresponding to each input image signal IDAT in units of one frame set including two or more consecutive frames. For example, the first and second pixels PX1 and PX2 display an image for each input image signal IDAT1 in two consecutive frames 1F and 2F, and the next two consecutive frames 3F and 4F It is possible to display an image for each next input video signal IDAT2.

Referring first to the first pixel PX1, a first image H according to a first gamma curve GH as shown in FIG. 3 or 17 is displayed in one of two frames included in one frame set And the remaining one frame may display the second image L according to the second gamma curve GL. At this time, the order of displaying the first image H and the second image L in the two consecutive frame sets may be reversed or the same. In addition, the first pixel PX1 may display an image according to the above-described various embodiments (Figs. 4 to 6, 18A to 22B, 24A to 33B, and the like).

The gamma curve of the second pixel PX2 in the same frame 1F, 2F, 3F and 4F is different from the gamma curve of the first pixel PX1 . For example, as shown in FIG. 34, the second pixel PX2 in the frame in which the first pixel PX1 displays the first image H can display the second image L, and vice versa Lt; / RTI > If the gamma curves of the images displayed by the neighboring pixels PX1 and PX2 are different from each other, display defects such as flicker can be reduced. In particular, vertical line irregularity, flicker, and the like that may occur in the frame inversion driving or the thermal inversion driving in which the polarity of the data voltage Vd changes for each frame can be further reduced.

35 and 36, in this embodiment also, one pixel PX may include first and second sub-pixels PXa and PXb, and may not be differently divided as shown in FIG. The first pixel PX1, the second pixel PX2, the third pixel PX3 and the fourth pixel PX4 are adjacent to each other in the row direction or the column direction on the display panel 300 and have different input image signals IDAT May be four pixels to be displayed. The first through fourth pixels PX1, PX2, PX3, and PX4 may form a matrix.

Each pixel PX1, PX2, PX3, and PX4 can display an image as shown in Figs. 4 to 6, Figs. 18A to 22B, and Figs. 24A to 33B described above. 36 shows an example in which each pixel PX1, PX2, PX3 and PX4 displays an image as shown in Fig. 18A or Fig. 18B described above. Fig. 35 shows an example in which the third image M 1 < / RTI > image (H).

According to the present embodiment, the order of the images displayed by the first pixel PX1 and the second pixel PX2 neighboring in the row direction in the neighboring frame set may be reversed, and the order of the first pixels PX1 and PX2 adjacent to each other in the column direction PX1 and the third pixel PX3 may be reversed. Therefore, the images displayed by two adjacent pixels PX1, PX2, PX3, and PX4 in the diagonal direction in one frame 1F, 2F, 3F, and 4F can be the same.

If the gamma curves of the images displayed by the neighboring pixels PX1, PX2, PX3 and PX4 are different from each other, display defects such as flicker can be reduced.

37 to 41, a display device and a driving method thereof according to an embodiment of the present invention will be described.

FIG. 37 is a graph showing a gamma curve of a display device according to an embodiment of the present invention, FIGS. 38 and 39 are timing diagrams showing a driving method of a backlight unit of a display device according to an embodiment of the present invention, 40 and FIG. 41 are diagrams showing the gradation of the image and the brightness of the backlight unit, which are displayed by the display apparatus according to the input image signal, according to an embodiment of the present invention.

The display device according to the present embodiment may be the same as the display device according to the above-described various embodiments, and the driving method thereof may be in accordance with various embodiments described above. Further, the gamma curve applied to the display device according to the present embodiment may be the same as the gamma curve shown in FIG. 3, FIG. 17, or FIG. However, the display apparatus according to the present embodiment can control ON / OFF of the backlight unit 900 according to the gradation of the applied gamma data and the input image signal IDAT. The signal controller 600 analyzes the gamma data and the input video signal IDAT to control the on / off state of the backlight unit 900 and generates a backlight control signal CONT4 based on the analysis result, ).

37, for the first gamma curve GH exhibiting a relatively high luminance and the second gamma curve GL exhibiting a relatively low luminance, a first period E and a second period F The difference between the luminance of the first image H according to the first gamma curve GH and the luminance of the second image L according to the second gamma curve GL is the difference between the highest luminance and the lowest luminance Quot;), which is about 70%

In the first and second sections E and F, the response speed of the liquid crystal molecules may affect the visibility when the brightness is changed from the high brightness to the low brightness. That is, when the drop response speed of the liquid crystal molecules in the first and second sections E and F is slow, the low gradation can not be sufficiently expressed and the visibility may be deteriorated.

However, according to the embodiment of the present invention, as shown in Figs. 37 and 38, after the pixel PX displays the first image H of high luminance not the highest luminance in the first frame 1F, When the second image L of the lowest luminance is displayed in the second frame 2F (the first period E in FIG. 37), the backlight unit 900 is turned off during the second frame 2F to display a complete black can do. At this time, the luminance of the first image H of high luminance may be about 70% or more of the maximum luminance.

37 and 38, when the pixel PX displays the first image H with the highest luminance in the first frame 1F and then 0 in the second frame 2F as in the second section F, When the second image L of low luminance is displayed, the backlight unit 900 can be turned on for a part of the time without completely turning off the backlight unit 900 during the second frame 2F. At this time, the luminance of the second image L of low luminance may be about 30% or less of the maximum luminance. The PWM duty ratio of the time during which the backlight unit 900 is turned on in the second frame 2F can be adjusted and the PWM duty ratio R of the backlight unit 900 can be adjusted by the following equation Can be determined by Equation (1).

[Equation 1]

R = 1- a / b

In Equation (1), b represents the maximum luminance that can be expressed by flowing the best driving current to the backlight unit 900, and a is the actual luminance when the backlight unit 900 is turned on and the target luminance of the input video signal IDAT And shows the difference in luminance. At this time, when the backlight unit 900 is on, the difference between the actual displayed luminance and the target luminance can be measured in advance and stored in a separate memory. Equation (1) assumes that the luminance of the backlight unit 900 linearly increases in accordance with the PWM duty ratio (R).

The section in which the backlight unit 900 is turned on in accordance with the PWM duty ratio R in the second section F is located at the end of the second frame 2F as in the first case CASE I of FIG. Or may be located at the beginning of the second frame 2F, such as the second case (CAST II). In case of the first case (CASE I), since the slow descending response speed of the liquid crystal molecules can be compensated first to sufficiently express the low gradation, it may be more preferable for improving the visibility.

In the second frame 2F, the backlight unit 900 may be on during the remainder of the frame except for the first and second sections E and F and the frames other than the second frame 2F.

Referring to FIGS. 37 and 39, the pixel PX of the display device according to the embodiment of the present invention is arranged in the third (E, F) direction in accordance with the gamma curve of the first and second sections E and F shown in FIG. 37 When the first image H of high luminance is displayed in the fourth frame 4F after displaying the second image L of low luminance in the frame 3F and the backlight unit 900 is displayed during the fourth frame 4F, The backlight unit 900 can emit light stronger by the boosting luminance dU at the basic luminance (100%) than the basic driving current. The luminance of the light provided by the backlight unit 900 to the pixel PX in the fourth frame 4F is higher than the luminance of the light provided to the pixel PX by the backlight unit 900 in the third frame 3F .

The magnitude of the boosting drive current Id_U, which is the drive current at the time of emitting light stronger by the boosting luminance dU, can be determined by the following equation.

&Quot; (2) "

Id_U = (1+ c / d) * Id

Id represents the driving current when the backlight unit 900 has a basic luminance of 100%, d represents the basic luminance of 100%, c represents the target luminance of the input video signal IDAT and The value of c is measured in advance and can be stored in a separate memory.

During the remaining frame except for the first and second sections E and F and the frames other than the fourth frame 4F in the fourth frame 4F, the backlight unit 900 can emit light of the basic luminance have.

Figs. 40 and 41 show an example of the operation of the display panel 300 and the backlight unit 900 according to the embodiment shown in Figs. 38 and 39, respectively.

In the present embodiment, the backlight unit 900 can be driven by a local dimming driving method that is divided into a plurality of light-emitting blocks and can control the light amount of each light-emitting block.

40, when input image signals IDAT from 0 gradation to 240 gradation are sequentially inputted to each pixel PX of the display panel 300, a first gamma curve ( Each pixel PX of the display panel 300 receives a data voltage Vd corresponding to the first image H and the backlight unit 900 applies light of a basic luminance of 100% ).

In the second frame 2F, each pixel PX of the display panel 300 receives the data voltage Vd corresponding to the second image L according to the second gamma curve GL, (PX) receives a data voltage (Vd) corresponding to the 0th gradation which is the lowest gradation. At this time, the backlight unit 900 is connected to the pixel PX corresponding to the first section E of FIG. 37, that is, the pixel PX receiving the data voltage Vd corresponding to the 0 gradation in the second frame 2F It is possible to provide the display panel 300 with light of 0% brightness. The pixel PX corresponding to the second section F of FIG. 37 can be turned on for a predetermined time during the PWM duty ratio R to provide the display panel 300 with light with a luminance lower than 100% have.

41, when input image signals IDAT from 0 gradation to 240 gradation are sequentially inputted to each pixel PX of the display panel 300, a second gamma curve ( Each pixel PX of the display panel 300 receives a data voltage Vd corresponding to the second image L and the backlight unit 900 applies light of a basic luminance of 100% ).

In the second frame 2F, each pixel PX of the display panel 300 receives the data voltage Vd corresponding to the first image H according to the first gamma curve GH, (PX) receives a data voltage (Vd) corresponding to 255 gradations, which is the highest gradation. At this time, the backlight unit 900 applies the boosting driving current Id_U to the pixel PX corresponding to the first and second sections E and F of FIG. 37, and outputs the boosting luminance dU to the basic luminance It is possible to provide light to the display panel 300.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

3: liquid crystal layer 31: liquid crystal molecule
100, 200, 300: display panel 110, 210: substrate
121, 121a, 121b: gate line 123: decompression gate line
140: gate insulating film 154a, 154b, 154c: semiconductor
171, 171a, and 171b: data lines 180, 180p, and 180q:
191, 191a, 191b: pixel electrode 220: shielding member
230: color filter 250: cover film
270: opposing electrode 400: gate driver
500: Data driver 600: Signal controller
650: memory 660: frame memory
800: gradation voltage generator 900:
950:

Claims (54)

A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve,
A gradation voltage generator for generating a gradation voltage based on the gamma data,
A signal controller for receiving an input video signal from outside,
A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage,
A display panel including a plurality of pixels for receiving the data voltage and displaying an image in a frame unit;
/ RTI >
Wherein one of the plurality of pixels displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein the image displayed by the pixel during the one frame set includes a first image along the first gamma curve and a second image along the second gamma curve,
The luminance of the first image is not lower than the luminance of the second image,
Wherein the second image for the pixel is displayed in two consecutive frames,
A sequence of images displayed by the one pixel in a first frame set and a sequence of images displayed by the one pixel in a second frame set that is continuous to the first frame set and includes the same number of frames as the first frame set Are opposite to each other. delete The method of claim 1,
Said set of frames comprising three or more consecutive frames,
Wherein during the first set of frames the first image is displayed for one frame and the second image is displayed for two or more consecutive frames
Display device. 4. The method of claim 3,
Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves,
Wherein the pixel further displays a third image along the third gamma curve during the set of frames,
Wherein the luminance of the third image is not higher than the luminance of the first image and is not lower than the luminance of the second image
Display device. 5. The method of claim 4,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein an image displayed by the first pixel and the second pixel during the frame set includes the first image and the second image,
Wherein a gamma curve of an image displayed by the first pixel in one frame and a gamma curve of an image displayed by the second pixel are different from each other
Display device. The method of claim 1,
Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves,
Wherein the pixel further displays a third image along the third gamma curve during the set of frames,
Wherein the luminance of the third image is not higher than the luminance of the first image and is not lower than the luminance of the second image
Display device. The method of claim 6,
Wherein the set of frames comprises three or more consecutive frames. 8. The method of claim 7,
Wherein the frame in which the pixel displays the third image in the frame set is located between the frame displaying the first image and the frame displaying the second image. 9. The method of claim 8,
Wherein the order of the image displayed by the one pixel in the first frame set and the order of the image displayed by the one pixel in the second frame set subsequent to the first frame set are opposite to each other. The method of claim 6,
Wherein the third image is displayed in two consecutive frames. 11. The method of claim 10,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein an image displayed by the first pixel and the second pixel during the frame set includes the first image and the second image,
Wherein a gamma curve of an image displayed by the first pixel in one frame and a gamma curve of an image displayed by the second pixel are different from each other
Display device. The method of claim 6,
Wherein the memory further stores gamma data for a fourth gamma curve different from the first, second and third gamma curves,
Wherein the pixel further displays a fourth image along the fourth gamma curve during the set of frames,
Wherein the luminance of the fourth image is not higher than the luminance of the third image and is not lower than the luminance of the second image
Display device. The method of claim 12,
Wherein the frame for displaying the fourth image in the frame set is located between the frame for displaying the third image and the frame for displaying the second image. The method of claim 13,
Wherein the order of the image displayed by the one pixel in the first frame set and the order of the image displayed by the one pixel in the second frame set subsequent to the first frame set are opposite to each other. The method of claim 14,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein an image displayed by the first pixel and the second pixel during the frame set includes the first image and the second image,
Wherein a gamma curve of an image displayed by the first pixel in one frame and a gamma curve of an image displayed by the second pixel are different from each other
Display device. The method of claim 1,
Wherein the pixel includes a first sub-pixel and a second sub-pixel for displaying an image for the same input video signal,
The first sub-pixel and the second sub-pixel respectively display an image corresponding to the input image signal during the one frame set,
The second image displayed by one of the first sub-pixel and the second sub-pixel is displayed in two consecutive frames
Display device. 17. The method of claim 16,
The order of the images displayed by the first and second sub-pixels in the first frame set and the order of the images displayed by the first and second sub-pixels in the second frame set subsequent to the first frame set are opposite / RTI > The method of claim 17,
Wherein the set of frames comprises three or more consecutive frames. The method of claim 18,
Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves,
At least one of the first sub-pixel and the second sub-pixel further displays a third image along the third gamma curve during the set of frames,
Wherein the luminance of the third image is not higher than the luminance of the first image and is not lower than the luminance of the second image
Display device. 20. The method of claim 19,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel includes a first sub-pixel and a second sub-pixel for displaying an image of the one input video signal,
Wherein each of the first pixel and the second pixel displays an image corresponding to the one input image signal during one frame set including two or more consecutive frames,
A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by at least one of the first sub-pixel and the second sub-pixel of the second pixel, The gamma curves to which the image is to be displayed are different
Display device. 17. The method of claim 16,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel includes a first sub-pixel and a second sub-pixel for displaying an image of the one input video signal,
Wherein each of the first pixel and the second pixel displays an image corresponding to the one input image signal during one frame set including two or more consecutive frames,
A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by at least one of the first sub-pixel and the second sub-pixel of the second pixel, The gamma curves to which the image is to be displayed are different
Display device. 17. The method of claim 16,
Wherein the memory further stores gamma data for a third gamma curve different from the first and second gamma curves,
At least one of the first sub-pixel and the second sub-pixel further displays a third image along the third gamma curve during the set of frames,
Wherein the luminance of the third image is not higher than the luminance of the first image and is not lower than the luminance of the second image
Display device. The method of claim 22,
Wherein the set of frames comprises three or more consecutive frames. 24. The method of claim 23,
A frame in which one of the first sub-pixel and the second sub-pixel displays the third image in the frame set is located between a frame displaying the first image and a frame displaying the second image Display device. 25. The method of claim 24,
The order of the images displayed by the first and second sub-pixels in the first frame set and the order of the images displayed by the first and second sub-pixels in the second frame set subsequent to the first frame set are opposite / RTI > The method of claim 22,
Wherein the third image displayed by one of the first sub-pixel and the second sub-pixel is displayed in two consecutive frames. 26. The method of claim 26,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel includes a first sub-pixel and a second sub-pixel for displaying an image of the one input video signal,
Wherein each of the first pixel and the second pixel displays an image corresponding to the one input image signal during one frame set including two or more consecutive frames,
A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by at least one of the first sub-pixel and the second sub-pixel of the second pixel, Is different from the gamma curve that the image displayed by
Display device. The method of claim 22,
Wherein the memory further stores gamma data for a fourth gamma curve different from the first, second and third gamma curves,
Wherein at least one of the first sub-pixel and the second sub-pixel further displays a fourth image according to the fourth gamma curve during the set of frames,
Wherein the luminance of the fourth image is not higher than the luminance of the third image and is not lower than the luminance of the second image
Display device. 29. The method of claim 28,
The frame in which one of the first sub-pixel and the second sub-pixel displays the fourth image in the frame set is located between the frame displaying the third image and the frame displaying the second image Display device. 30. The method of claim 29,
The order of the images displayed by the first and second sub-pixels in the first frame set and the order of the images displayed by the first and second sub-pixels in the second frame set subsequent to the first frame set are opposite / RTI > 32. The method of claim 30,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel includes a first sub-pixel and a second sub-pixel for displaying an image of the one input video signal,
Wherein each of the first pixel and the second pixel displays an image corresponding to the one input image signal during one frame set including two or more consecutive frames,
A gamma curve in which an image displayed by at least one of the first sub-pixel and the second sub-pixel of the first pixel is followed by at least one of the first sub-pixel and the second sub-pixel of the second pixel, Is different from the gamma curve that the image displayed by
Display device. The method of claim 1,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein an image displayed by the first pixel and the second pixel during the frame set includes the first image and the second image,
When the first pixel displays the first image in one frame, the second pixel displays the second image
Display device. The method of claim 1,
Further comprising a backlight unit for providing light to the display panel,
Said set of frames comprising a first frame and a second frame following said first frame,
Wherein the pixel displays the first image in the first frame and the second image in a second frame,
Wherein the backlight unit provides the display panel with light of a first luminance in the first frame and provides the display panel with light of a second luminance lower than the first luminance in the second frame
Display device. 34. The method of claim 33,
The luminance of the second image displayed in the second frame is 0,
Wherein the backlight unit is turned off during the second frame so as not to provide light to the pixel
Display device. 34. The method of claim 33,
Wherein the backlight is turned on for a first time in the second frame to provide light to the pixel,
Wherein the duty ratio of the first time is less than one
Display device. The method of claim 1,
Further comprising a backlight unit for providing light to the display panel,
Said set of frames comprising a first frame and a second frame following said first frame,
Wherein the pixel displays the second image in the first frame and the first image in a second frame,
Wherein the luminance of the light provided by the backlight unit to the pixel in the second frame is higher than the luminance of light provided to the pixel by the backlight unit in the first frame
Display device. 37. The method of claim 36,
Wherein the brightness of the second image displayed in the first frame is 0 or the brightness of the first image displayed in the second frame is the highest brightness. The method of claim 1,
Wherein the display panel further comprises a liquid crystal layer including a plurality of liquid crystal molecules,
Wherein when one of the two adjacent frames displays an image of the first luminance and then displays an image of the second luminance lower than the first luminance, the brightness of the image displayed by the one pixel is lower than the luminance of the first and second The falling response speed of the liquid crystal molecules when the luminance difference of the luminance image is changed from 99% to 1% of the luminance difference is 4.17 ms or less when the frame frequency is 240 Hz
Display device. The method of claim 1,
Wherein the display panel further comprises a liquid crystal layer including a plurality of liquid crystal molecules,
Wherein when one of the two adjacent frames displays an image of the first luminance and then displays an image of the second luminance lower than the first luminance, the brightness of the image displayed by the one pixel is lower than the luminance of the first and second The falling response speed of the liquid crystal molecules when the luminance difference of the luminance image is changed from 99% to 1% of the luminance difference is 8.3 ms or less when the frame frequency is 120 Hz
Display device. delete delete A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve,
A gradation voltage generator for generating a gradation voltage based on the gamma data,
A signal controller for receiving an input video signal from outside,
A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage,
A display panel including a pixel for receiving the data voltage and displaying an image in a frame unit, and
And a backlight unit
Lt; / RTI >
Wherein the pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Said set of frames comprising a first frame and a second frame following said first frame,
Wherein the pixel displays a first image along the first gamma curve in the first frame and a second image along the second gamma curve in the second frame,
The luminance of the first image is not lower than the luminance of the second image,
Wherein the backlight unit provides the display panel with light of a first luminance in the first frame and provides the display panel with light of a second luminance lower than the first luminance in the second frame
Display device. 43. The method of claim 42,
The luminance of the second image displayed in the second frame is 0,
Wherein the backlight unit is turned off during the second frame and does not provide light to the pixel
Display device. 43. The method of claim 42,
Wherein the backlight is turned on for a first time in the second frame to provide light to the pixel,
Wherein the duty ratio of the first time is less than one
Display device. A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve,
A gradation voltage generator for generating a gradation voltage based on the gamma data,
A signal controller for receiving an input video signal from outside,
A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage,
A display panel including a pixel for receiving the data voltage and displaying an image in a frame unit, and
And a backlight unit
Lt; / RTI >
Wherein the pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Said set of frames comprising a first frame and a second frame following said first frame,
Wherein the pixel displays a second image along the second gamma curve in the first frame and a first image along the first gamma curve in the second frame,
The luminance of the first image is not lower than the luminance of the second image,
The luminance of the light provided by the backlight unit to the pixel in the second frame is higher than the luminance of light provided to the pixel by the backlight unit in the first frame
Display device. 45. The method of claim 45,
Wherein the brightness of the second image displayed in the first frame is 0 or the brightness of the first image displayed in the second frame is the highest brightness. A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, a gradation voltage generator for generating a gradation voltage based on the gamma data, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, and a plurality of pixels In the display device including the display panel,
Displaying a first image along the first gamma curve during a first frame of a frameset, where one of the plurality of pixels comprises two or more consecutive frames, and
Wherein the pixel displays a second image along the second gamma curve during a second frame of the frame set
Lt; / RTI >
The luminance of the first image is not lower than the luminance of the second image,
Wherein the second image for the pixel is displayed in two consecutive frames,
A sequence of images displayed by the one pixel in a first frame set and a sequence of images displayed by the one pixel in a second frame set that is continuous to the first frame set and includes the same number of frames as the first frame set Are opposite to each other. 47. The method of claim 47,
Wherein the display panel includes a first pixel and a second pixel which are adjacent to each other and display an image corresponding to different input video signals,
Wherein each of the first pixel and the second pixel displays an image corresponding to one input image signal during one frame set including two or more consecutive frames,
Wherein an image displayed by the first pixel and the second pixel during the frame set includes the first image and the second image,
Wherein a gamma curve of an image displayed by the first pixel in one frame and a gamma curve of an image displayed by the second pixel are different from each other
A method of driving a display device. 47. The method of claim 47,
Wherein the pixel includes a first sub-pixel and a second sub-pixel for displaying an image for the same input video signal,
The first sub-pixel and the second sub-pixel respectively display an image corresponding to the input image signal during the one frame set,
The second image displayed by one of the first sub-pixel and the second sub-pixel is displayed in two consecutive frames
A method of driving a display device. A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, a gradation voltage generator for generating a gradation voltage based on the gamma data, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, and a pixel for receiving the data voltage and displaying an image in frame units, A display panel, and a backlight unit for providing light to the display panel,
Displaying a first image along the first gamma curve during a first frame of a frameset, the pixel comprising two or more consecutive frames, and
Wherein the pixel displays a second image along the second gamma curve during a second frame of the frame set
Lt; / RTI >
The luminance of the first image is not lower than the luminance of the second image,
Wherein the backlight unit provides the display panel with light of a first luminance in the first frame and provides the display panel with light of a second luminance lower than the first luminance in the second frame
A method of driving a display device. 50. The method of claim 50,
The luminance of the second image displayed in the second frame is 0,
Wherein the backlight unit is turned off during the second frame and does not provide light to the pixel
A method of driving a display device. 50. The method of claim 50,
Wherein the backlight is turned on for a first time in the second frame to provide light to the pixel,
Wherein the duty ratio of the first time is less than one
A method of driving a display device. A memory for storing gamma data for two or more gamma curves including a first gamma curve and a second gamma curve, a gradation voltage generator for generating a gradation voltage based on the gamma data, A data driver for receiving the input video signal from the signal controller and converting the input video signal to a data voltage using the gray scale voltage, and a pixel for receiving the data voltage and displaying an image in frame units, A display panel, and a backlight unit for providing light to the display panel,
Displaying a second image along the second gamma curve during a first frame of a frameset, the pixel comprising two or more consecutive frames, and
Wherein the pixel displays a first image along the first gamma curve during a second frame of the frame set
Lt; / RTI >
The luminance of the first image is not lower than the luminance of the second image,
The luminance of the light provided by the backlight unit to the pixel in the second frame is higher than the luminance of light provided to the pixel by the backlight unit in the first frame
A method of driving a display device. 53. The method of claim 53,
Wherein the brightness of the second image displayed in the first frame is 0 or the brightness of the first image displayed in the second frame is the highest brightness.

Images