KR20110050056A - Liquid crystal display device and method of driving the same - Google Patents

Abstract

PURPOSE: A liquid crystal apparatus and a method for driving the same are provided to drive data wirings by groups in order to minimize the heat emission of a driving circuit for driving each group. CONSTITUTION: A plurality of data wirings is respectively included in a plurality of data wiring groups. The data wirings are expanded along a column direction. A group driving part(333) corresponds to the data wiring groups. The group driving part responds to a group polarity controlling signal and a group horizontal dot inversion signal in order to convert image data into a data voltage. The group driving part includes a digital-to-analog converter part(334), an output buffer part(335), and a charge sharing part(336).

Description

Liquid crystal display device and method of driving the same

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a driving method thereof.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting diodes Various flat display devices such as organic light emitting diodes (OLEDs) are being utilized.

Among these flat panel display devices, liquid crystal display devices are widely used because they have advantages of miniaturization, light weight, thinness, and low power driving.

The liquid crystal display includes a plurality of gate wirings and data wirings crossing each other to define a pixel, and a switching transistor formed in the pixel. Scan pulses are sequentially applied to the plurality of gate lines every horizontal period, thereby turning on the switching transistors positioned in the pixels of the corresponding row line. In synchronization with this, the data driver outputs data voltages through a plurality of data wirings, and the data voltages thus output are applied to the corresponding pixels.

As such, the data driver outputs a data voltage every horizontal period, and the output data voltage has a polarity change or a voltage value, that is, a gray level, for each horizontal period. That is, the amount of change in the output data voltage is generated. When the amount of change in the data voltage increases, the power consumption of the data driver increases.

Therefore, in order to reduce such fluctuation amount of the data voltage, a charge share driving method has been proposed. The charge share driving method is to average the voltages of the entire data lines before outputting by shorting the entire data lines from each other between neighboring horizontal periods. That is, the data wiring is precharged to the charge share voltage before the next output. Accordingly, it is possible to reduce the amount of variation in the output data voltage.

However, such a conventional charge share driving method is performed before every horizontal period, and in some cases, power consumption may be wasted. That is, the amount of change from the charge share voltage to the next data voltage is Higher cases may occur than the amount of change from the previous data voltage to the next data voltage. In such a case, performing the charge share results in an increase in power consumption.

In addition, in the related art, since the data driver drives the entire data wiring in the same manner, the image quality deterioration may occur in a part of the image display area. For example, the data driver outputs a data voltage in response to one polarity control signal and a horizontal dot in version signal. Here, the polarity control signal determines the polarity of the output data voltage. The horizontal dot inversion signal determines the horizontal dot inversion method of the row line.

As described above, the polarity control signal and the horizontal dot-in version signal determine the driving of the entire data wiring. In some regions of the display area, the polarization may be biased to the positive or negative polarity, thereby degrading the image quality. . In addition, the temperature of the driving circuit which is responsible for driving the partial region may increase and power consumption may increase.

Further, the conventional data driver performs charge share driving of the entire data wiring in response to one charge share control signal. Accordingly, an increase in temperature and an increase in power consumption of the driving circuit which is responsible for driving of some regions may be caused.

The present invention has a problem to provide a liquid crystal display device and a driving method thereof that can improve power consumption and image quality.

In order to achieve the above object, the present invention is to provide a plurality of data wirings belonging to each of a plurality of data wiring groups, extending along the column direction; Corresponding to the data wiring group, the image data is converted into a data voltage in response to a group polarity control signal and a group horizontal dot inversion signal, and output to each of the plurality of data wirings of the data wiring group, and to a group charge share control signal. And a data driver including a group driver configured to perform a charge share on / off operation for the data wiring group, wherein the group polarity control signal and the group horizontal dot in version signal correspond to the data wiring group. A liquid crystal display device for determining a polarity of a data voltage group and a horizontal dot inversion method is provided.

The group driver may include a DAC unit for converting the image data into the data voltage in response to the group polarity control signal and the group horizontal dot in version signal; An output buffer unit for amplifying the converted data voltage and outputting the converted data voltage to the data wiring line; And a group charge share unit configured to perform a charge share on / off operation for the data wiring group in response to the group charge share control signal.

And a group controller configured to generate the group polarity control signal, the group horizontal dot inversion signal, and the group charge control signal to control the group driver, wherein the group controller is configured to control the data voltage group. The average of the absolute value of the variation amount of the data voltages when the charge-sharing operation is performed and the average of the absolute value of the variation amount of the voltages of the data voltages when the charge-sharing operation is performed. Among the lower values, the operation corresponding to the lower value can be controlled.

The group controller compares the DC component in the horizontal 1-dot inversion scheme with the DC component in the horizontal 2-dot inversion scheme with respect to the data voltage group, and is closer to a common voltage among the DC components. The horizontal dot inversion method corresponding to the value may be controlled to be performed.

The group control unit may control the polarity of the DC voltages of all the data voltage groups of the row line to be close to the common voltage as the polarity of the data voltage group.

In another aspect, the present invention includes a plurality of data wirings belonging to each of a plurality of data wiring groups and extending along a column direction; A driving method of a liquid crystal display device comprising a data driver including a group driver corresponding to the data wiring group, wherein the group driver is configured to output image data in response to a group polarity control signal and a group horizontal dot in version signal. Outputting the data to each of the plurality of data wires of the data wire group; And performing, in the group driver, a charge share on / off operation for the data wiring group in response to a group charge share control signal, wherein the group polarity control signal and the group horizontal dot in version signal are the data. A liquid crystal display device driving method for determining a polarity and a horizontal dot inversion method of a data voltage group corresponding to a wiring group is provided.

The method may further include amplifying the converted data voltage and outputting the converted data voltage to the data line.

The method may further include controlling a charge share on / off operation of the group driver, and the controlling of the charge share on / off operation may include: a data voltage when the charge share off operation is performed on the data voltage group; Comparing an average of the absolute values of the variation amounts of the circuits with an average of the absolute values of the variation amounts of the data voltage voltages when the charge sharing operation is performed; The method may include controlling to perform an operation corresponding to a low value among absolute values of absolute values of the variation amounts of the data voltages.

The method may further include controlling a horizontal dot inversion method of the data voltage group, and the controlling of the horizontal dot inversion method may include: a DC component in the horizontal 1 dot inversion method with respect to the data voltage group; Comparing the DC components in the horizontal 2-dot inversion scheme; The method may include controlling the horizontal dot inversion scheme corresponding to a value close to the common voltage among the DC components.

And controlling the polarity of the data voltage group, wherein the controlling the polarity of the data voltage group is such that the average of DC components of all data voltage groups of a row line is close to a common voltage. Controlling to have polarity.

In the present invention, as the data wirings are driven in groups, power consumption and heat generation of the driving circuit for driving each group can be minimized. As a result, it is possible to minimize the power consumption and heat generation of the drive circuit for driving the entire group.

Furthermore, by being driven in groups, it is possible to optimize image display in a display area corresponding to the group. This consequently makes it possible to optimize the image display in the entire display area.

As described above, according to the present invention, power consumption and heat generation can be minimized, and image display can be optimized.

Hereinafter, with reference to the drawings will be described embodiments of the present invention.

1 is a view schematically showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a view schematically showing a pixel structure according to an embodiment of the present invention, and FIG. 3 is a view showing an embodiment of the present invention. Figure is a schematic view showing the data driver.

As illustrated, the liquid crystal display device 100 according to the embodiment of the present invention includes a liquid crystal panel 200, a driving circuit, and a backlight 400. The driving circuit includes a timing controller 310, a gate driver 320, and a data driver 330.

The liquid crystal panel 200 corresponds to a display unit displaying an image. In the liquid crystal panel 200, a plurality of gate lines GL extending in a row direction and a plurality of data lines DL extending in a column direction intersect with each other to form a plurality of pixels arranged in a matrix form. Define P).

In each pixel P, a switching transistor T connected to the gate line and the data line GL and DL is formed. The switching transistor T is connected to the pixel electrode. Meanwhile, a common electrode is formed corresponding to the pixel electrode. When a data voltage and a common voltage are applied to each of the pixel electrode and the common electrode, an electric field is formed between them. The electric field thus formed drives the liquid crystal. The pixel electrode, the common electrode, and the liquid crystal positioned between these electrodes constitute a liquid crystal capacitor Clc. Meanwhile, a storage capacitor Cst is further configured in each pixel P, which stores a data voltage applied to the pixel electrode until the next frame.

The backlight 400 serves to supply light to the liquid crystal panel 200. As the backlight 400, a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED) may be used.

The timing controller 310 receives a control signal and image data from an external system such as a TV system or a video card. The timing controller 310 generates a gate control signal GCS for controlling the gate driver 320 and a data control signal DCS for controlling the data driver 330 using the input control signal.

The gate control signal GCS includes, for example, a gate start pulse, a gate sheet clock, a gate output enable signal, and the like.

Referring to FIG. 3, the data control signal DCS includes a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, a plurality of group polarity control signals POL_G1 to POL_Gm, and a plurality of data control signals DCS. Group horizontal dot inversion signals HINV_G1 to HINV_Gm, a plurality of group charge share control signals CSC_G1 to CSC_Gm, and the like.

Here, the plurality of group polarity control signals POL_G1 to POL_Gm, the plurality of group horizontal dot inversion signals HINV_G1 to HINV_Gm, and the plurality of group charge share control signals CSC_G1 to CSC_Gm are group control units of the timing controller 310. 311 may be generated.

The gate driver 320 sequentially scans the plurality of gate lines GL every frame in response to the gate control signal GCS supplied from the timing controller 310. That is, during every horizontal period, the turn-on voltage is supplied to the gate wiring GL. On the other hand, the turn-off voltage is supplied to the gate wiring GL until the next frame is scanned. As the turn-on voltage is applied during the horizontal period, the switching transistor T is turned on.

In response to the data control signal DCS supplied from the timing controller 310, the data driver 330 converts the image data Data into a data voltage and outputs the data voltage to the corresponding data wiring DL. The data voltage thus output is applied to the pixel P through the data wiring DL.

In the embodiment of the present invention, the data wiring DL is divided into groups and driven individually in groups. In addition, in order to drive the data wiring DL in group units, the data driver 330 may include group driving units 333_1 to 333_m corresponding to the data wiring groups GR1 to GRm, respectively. This will be described in more detail with reference to FIG. 3.

Referring to FIG. 3, a plurality of data wiring groups GR1 to GRm, that is, first to m data wiring groups GR1 to GRm, are defined. Each data wiring group GR1 to GRm belongs to a plurality of neighboring data wirings D1 to D6. For convenience of description, it is assumed that each data wiring group GR1 to GRm includes six data wirings, that is, first to sixth data wirings DL1 to DL6. On the other hand, it is preferable that the number of data wirings which belong to each data wiring group GR1-GRm is three or more. Furthermore, it is more preferable that the number of data wirings belonging to each data wiring group GR1 to GRm is an even number such as 4, 6, 8, or the like.

The data driver 330 includes a plurality of group drivers 333_1 to 333_m for driving each of the plurality of data wiring groups GR1 to GRm as described above. The data driver 330 may further include a shift register unit 331 and a latch unit 332.

The shift register unit 331 may include a plurality of shift registers. For example, the shift register shifts the source start pulse SSP according to the source shift clock SSC to generate the sampling signal SAM. In addition, the shift register shifts the source start pulse SSP to transfer a carry signal to the next shift register.

The latch unit 332 samples and latches the image data Data for one row line input in response to a sampling signal SAM sequentially input from the shift register unit 331. The latched video data Data is output in accordance with the source output enable signal SOE. Here, the source output enable signal SOE has an enable state and a disable state that are different voltage levels. Accordingly, the latched image data Data is output during the period in which the source output enable signal SOE has the enabled state.

The image data Data output from the latch unit 332 may be divided into groups. Each of the plurality of image data groups Data_G1 to Data_Gm divided in the group unit is input to the corresponding group driving units 333_1 to 333_m. For example, the output image data array for one row line is divided such that six neighboring image data form one image data group. Accordingly, the image data array may be divided into first to m image data groups Data_G1 to Data_Gm. Therefore, the first to m video data groups Data_G1 to Data_Gm are input to the corresponding first to m group driving units 333_1 to 333_m.

The group driving units 333_1 to 333_m are driven by the corresponding group polarity control signals POL_G1 to POL_Gm, the group horizontal dot inversion signals HINV_G1 to HINV_Gm, and the group charge share control signals CSC_G1 to CSC_Gm. Individually controlled.

Each of the group drivers 333_1 to 333_m converts the digital image data of the input image data group Data_G1 to Data_Gm into corresponding data voltages of analog type. That is, the group driving units 333_1 to 333_m convert the input image data groups Data_G1 to Data_Gm into data voltage groups Vd_G1 to Vd_Gm.

The data voltage groups Vd_G1 to Vd_Gm are output to the corresponding data wiring groups GR1 to GRm. Meanwhile, the group driving units 333_1 to 333_m short-circuit the data wirings DL1 to DL6 of the data wiring groups GR1 to GRm to perform charge share on driving or open to each other. Charge share off driving can be performed.

The group driving unit performing the above operation will be described further with reference to FIG. 4. 4 is a view schematically showing a group driving unit according to an embodiment of the present invention.

Referring to FIG. 4, the group driver 333 converts data in response to the corresponding group polarity control signal POL_G, the group horizontal dot version signal HINV_G, and the group charge share control signal CSC_G. Charge sharing can be performed.

The group driving unit 333 includes a digital-to-analog converter (DAC) unit 334, an output buffer unit 335, and a charge share unit 336.

The DAC unit 334 converts the input image data group Data_G into the data voltage group Vd_G in response to the group polarity control signal POL_G and the group horizontal dot inversion signal HINV_G.

Here, the group horizontal dot inversion signal HINV_G determines the horizontal dot inversion method of the data voltage group Vd_G.

In this regard, the group horizontal dot inversion signal HINV_G may have, for example, first and second states that are different voltage levels. Here, the first state may correspond to a state of determining the horizontal one-dot inversion scheme, and the second state of the second state.

In this regard, the horizontal one-dot inversion scheme refers to a horizontal dot inversion scheme in which polarity inversion is performed such that neighboring data voltages have different polarities in data voltages belonging to the data voltage group Vd_G. For example, the polarity inversion pattern of the data voltage group Vd_G means "+,-, +,-, +,-" or "-, +,-, +,-, +".

In the horizontal 2-dot inversion scheme, in the data voltages belonging to the data voltage group Vd_G, the neighboring data voltages on one side have different polarities and the neighboring data voltages on the other side have the same polarity. It means a horizontal dot inversion method in which polarity inversion is performed. For example, it means that the polarity inversion pattern of the data voltage group Vd_G is equal to "+,-,-, +, +,-" or "-, +, +,-,-, +". Here, the polarity of the data voltage is a polarity based on the common voltage applied to the common electrode.

The group polarity control signal POL_G may have, for example, first and second states having different voltage levels. Here, the polarities of the data voltages of the data voltage group Vd_G are determined according to the first and second states of the group polarity control signal POL_G. For example, for one data voltage belonging to the data voltage group Vd_G, if the group polarity control signal POL_G has positive polarity in the first state, the negative polarity in the second state Will have a negative (-).

Thus, the polarity of the entire data voltage group Vd_G may be determined according to the state of the group polarity control signal POL_G. In this regard, when the state of the group horizontal dot inversion signal HINV_G is determined, the horizontal dot inversion method, that is, the polarity inversion pattern of the data voltage group Vd_G, is determined. For example, suppose that the group horizontal dot inversion signal HINV_G has a first state, so that the horizontal one dot inversion method is selected. When the group polarity control signal POL_G has the first state, the polarity inversion pattern of the data voltage group Vd_G is " +,-, +,-, +,-" Assume that the gradation pattern of Vd_G) is " W, B, W, B, W, B ". Here, gray means the voltage level of the data voltage, W denotes white gray, B denotes black gray, and at the same polarity, it is assumed that the voltage level of the white gray is higher than the voltage level of the black gray. In such a case, the polarity of the data voltage group Vd_G will have a positive polarity (+).

Here, when the group polarity control signal POL_G has the second state, the polarity inversion pattern of the data voltage group Vd_G will be as "-, +,-, +,-, +", and the data voltage group ( The polarity of Vd_G) will be negative.

As described above, the group polarity control signal POL_G determines the polarity of each data voltage of the data voltage group Vd_G, and also the polarity of the data voltage group Vd_G.

Meanwhile, in the DAC unit 334 generating positive or negative data voltages, the positive gamma voltages VGP and the negative gamma voltages VGN are used. The positive gamma voltages VGP are composed of positive gray voltages, and a positive gray voltage corresponding to the gray of the image data input using the positive gamma voltages VGP may be output. In addition, the negative gamma voltages VGN include negative gray voltages, and a negative gray voltage corresponding to the gray of the image data input using the negative gamma voltages VGN may be output.

The output buffer unit 335 includes an output buffer AMP corresponding to each of the data voltages of the data voltage group Vd_G. The output buffer AMP consists of an operational amplifier and amplifies the input data voltage.

In this way, the data voltage group Vd_G amplified by the output buffer unit 335 is output to the corresponding data wiring group GR. That is, the data voltages of the data voltage group Vd_G are output to the data wirings D1 to D6 of the corresponding data wiring group GR.

The charge share unit 336 performs a charge share on operation by shorting the data wires DL1 to DL6 belonging to the data wire group GR according to the group charge share control signal CSC_G. The charge share off operation is performed by opening the data lines DL1 to DL6.

For this charge share on / off operation, the charge share unit 336 may include a plurality of switches SW. For example, the plurality of switches SW may be connected between the data lines DL1 to DL6 of the data line group GR. These switches SW are turned on / off in accordance with the group charge share control signal CSC_G to shorten / open the data lines DL1 to DL6. Accordingly, the charge share on / off operation is performed.

In this regard, the group charge share control signal CSC_G may have, for example, a turn-on state and a turn-off state that are different voltage levels. Here, the charge share operation is performed in the turn on state, and the charge share operation is not performed in the turn off state.

As described above, in the embodiment of the present invention, data wiring is driven in group units. For the group unit driving as described above, the data driver 330 is configured such that the group driver 333 corresponds to the data wiring group GR. Each of the group driving units 333 is controlled by the corresponding group polarity control signal POL_G, the group horizontal dot inversion signal HINV_G, and the group charge share control signal CSC_G to correspond to the corresponding data wiring group. GR can be driven individually.

As such, the timing controller 310 may include a group controller 311 to control driving of the group unit. The group control unit 311 analyzes the image and performs group control signals for individually controlling the group driver 333, for example, the group charge share control signal CSC_G input to each of the group driver 333. The group horizontal dot inversion signal HINV_G and the group polarity control signal POL_G may be generated. In this regard, the following description will be made with reference to FIGS. 5 and 6.

5 is a view showing an example of a method for generating a group charge share control signal according to an embodiment of the present invention, Figure 6 is an example of a method of generating a group horizontal dot in version signal according to an embodiment of the present invention Figure is shown.

The group charge share control signal CSC_G may be generated by comparing the average of the absolute values of the voltage fluctuations of the respective data voltage groups during charge share on / off driving. In this regard, a description will be given with reference to FIG. 5. Referring to FIG. 5, all of the data voltages of the k-th data voltage group output to the k-th data wiring group during the (n-1) th horizontal period have a black (B) gray voltage. During the nth horizontal period, all of the data voltages of the data voltage group have a voltage of white (W) gradation. During the (n-1) and nth horizontal periods, the first, third, and fifth data voltages have a negative polarity (−), and the second, fourth, and sixth data voltages have a positive polarity (+).

In this case, the variation amount of the data voltages in the charge share off operation is ΔVd1 = ΔVd3 = ΔVd5 = (Vw_p-Vb_p) and ΔVd2 = ΔVd4 = ΔVd6 = (Vw_n-Vb_n). That is, the variation amount of the data voltages in the charge share operation is the difference between the data voltages of the previous horizontal period and the data voltages of the current horizontal period.

In the charge share on operation, the data lines have the charge share voltage Vsh which is an average voltage of the data voltages output in the (n-1) th horizontal period.

Accordingly, the variation amount of the data voltages in the charge share on operation is ΔVd1 = ΔVd3 = ΔVd5 = (Vw_p-Vsh), and ΔV2 = ΔV4 = ΔV6 = (Vw_n-Vsh).

Here, it is assumed that the charge share voltage Vsh corresponds to the common voltage Vcom. In this case, the average of the absolute values of the fluctuation amounts of the data voltages in the charge share on operation is (3 | Vw_p-Vcom | + 3 | Vw_n-Vcom |) / 6. Where | Vw_p-Vcom | = | Vw_p-Vb_p | + | Vb_p-Vcom | and | Vw_n-Vcom | = | Vw_n-Vb_n | + | Vb_n-Vcom |

On the other hand, the average of the absolute values of the fluctuation amounts of the data voltages in the charge share operation is (3 | Vw_p-Vb_p | + 3 | Vw_n-Vb_n |) / 6.

Accordingly, it can be seen that the charge share off operation has a smaller average value of the voltage fluctuations than the charge share on operation. In this case, the charge share off operation is performed.

On the other hand, unlike the above, when the average of the absolute value of the voltage variation in the charge share on operation has a smaller value than the average of the absolute value of the voltage variation in the charge share on operation, the charge share on operation is performed. Be sure to

In this way, the group control unit 311 compares the average of the absolute value of the voltage variation during charge share on driving with the average of the absolute value of the voltage variation during charge share off driving and performs an operation with a small average. The state of the group charge share control signal CSC_G is determined. This is to perform an operation in a direction in which the voltage fluctuation amount is small, and corresponds to performing an operation in a direction in which the output fluctuation range of the data voltage is reduced. As such, by controlling the charge share on / off operation in a direction in which the voltage fluctuation amount is small, the power consumption can be improved in units of groups. In addition, as the power consumption is improved on a group basis, as a result, the total power consumption of the entire groups can be improved.

The group horizontal dot-inversion signal HINV_G may be generated by comparing the DC component of each data voltage group in the horizontal dot-inversion schemes, for example, the horizontal 1-dot inversion scheme and the horizontal 2-dot-inversion scheme. have. Here, the DC component of the data voltage group means an average value of data voltages belonging to the data voltage group.

In this regard, a description will be given with reference to FIG. 6. Referring to FIG. 6, in the k-th data voltage group, the first to sixth data voltages Vd1 to Vd6 alternately have white and black gradations. The first data voltage Vd1 has a positive polarity (+).

Here, when the horizontal one dot inversion scheme is performed, the first to sixth data voltages Vd1 to Vd6 have polarities of "+,-, +,-, +,-". On the other hand, when the horizontal 2-dot inversion scheme is performed, the first to sixth data voltages Vd1 to Vd6 have polarities of "+,-,-, +, +,-".

As described above, the DC component of the data voltage group in the horizontal two-dot inversion method is closer to the common voltage Vcom than the DC component of the data voltage group in the horizontal one-dot inversion method. In this case, the horizontal 2-dot inversion scheme is performed.

On the other hand, unlike the above, when the DC component of the data voltage group in the horizontal 1 dot inversion method is closer to the common voltage Vcom than the DC component of the data voltage group in the horizontal 2 dot inversion method, Allow 1-dot inversion to be performed.

In this way, the group controller 311 compares the DC components in different horizontal dot inversion schemes in group units so that the DC components perform the horizontal dot inversion scheme in a direction close to the common voltage Vcom. The state of the horizontal dot inversion signal HINV_G is determined. This corresponds to performing a horizontal dot inversion method in a direction of outputting data voltages close to a common voltage. As such, by controlling the data voltages to be close to the common voltage, power consumption and heat generation can be minimized in groups. In addition, it is possible to minimize the power consumption and heat generation in groups, as a result it is possible to minimize the total power consumption and heat generation of the entire group.

The group polarity control signal POL_G may be generated based on DC components of the data voltage groups of the same row line.

In this regard, for example, the state of each group polarity control signal POL_G may be determined such that the average of the DC component of all the data voltage groups is close to the common voltage. This may be more easily understood if one data voltage group is considered to correspond to one data voltage. For example, suppose that four data voltage groups exist and their DC components are equal to "+ W, + W, -B, -B". In this case, if the DC components of the four data voltage groups are made as "+ W, -W, + B, -B", the average of the DC components of the four data voltage groups is closer to the common voltage. Will be. Accordingly, each group polarity control signal POL_G may be generated such that the output of all data voltage groups is close to the common voltage. Accordingly, total power consumption and heat generation of the entire groups can be minimized.

Here, as described above, in determining the polarity of the data voltage group, it is possible to base the polarity of the neighboring data voltage group. For example, the DC component of the k-th data voltage group may have a voltage higher than the common voltage, so that the DC component may correspond to positive polarity (+). In this manner, the positive polarity (+) is superior in the k-th data voltage group.

In such a case, it is possible to determine the state of the (k + 1) th group polarity control signal POL_G so that the (k + 1) th data voltage group has negative polarity (−). That is, the DC component of the (k + 1) th data voltage group has a voltage lower than the common voltage, so that the DC component can correspond to the negative polarity (−). Accordingly, in the (k + 1) th data voltage group, the negative polarity (-) becomes dominant.

In contrast, when the negative polarity (-) is dominant in the kth data voltage group, the (k + 1) th group polarity control signal POL_G so that the positive polarity (+) is dominant in the (k + 1) th data voltage group. It is possible to determine the state of.

As described above, in the embodiment of the present invention, data wiring is driven in group units. To this end, the group polarity control signal, the group horizontal dot inversion signal, and the group charge share control signal are individually input to each of the group driver to control the group driver, and in response to the group control signals, the group driver transmits the corresponding data wiring. Groups can be driven individually.

As such, as the data wirings are driven in groups, power consumption and heat generation of the driving circuit for driving each group can be minimized. As a result, it is possible to minimize power consumption and heat generation of the driving circuit for driving the entire group.

Furthermore, by being driven in groups, it is possible to optimize image display in a display area corresponding to the group. This consequently makes it possible to optimize the image display in the entire display area.

As described above, according to the embodiment of the present invention, power consumption and heat generation can be minimized, and image display can be optimized.

Embodiment of the present invention described above is an example of the present invention, it is possible to change freely within the scope included in the spirit of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and their equivalents.

1 is a view schematically showing a liquid crystal display device according to an embodiment of the present invention.

2 schematically illustrates a pixel structure according to an embodiment of the present invention.

3 is a view schematically showing a data driver according to an embodiment of the present invention.

4 is a view schematically showing a group driving unit according to an embodiment of the present invention.

5 is a diagram illustrating an example of a method for generating a group charge share control signal according to an embodiment of the present invention.

6 is a diagram showing an example of a method for generating a group horizontal dot in version signal according to an embodiment of the present invention;

Description of the Related Art

333: group driving unit 334: DAC unit

335: Output buffer section 336: Charge share section

AMP: Output Buffer SW: Switch

POL_G: Group polarity control signal HINV_G: Group horizontal dot in version signal

CSC_G: Group Charge Share Control Signal

GR: Data wiring group

D1 to D6: first to sixth data wiring

Claims (10)

A plurality of data wires belonging to each of the plurality of data wire groups and extending along the column direction; Corresponds to the data wiring group, In response to the group polarity control signal and the group horizontal dot inversion signal, image data is converted into a data voltage and output to each of the plurality of data wires of the data wire group. A group driver for performing charge share on / off operation for the data wiring group in response to a group charge share control signal. Including a data driver including a, The group polarity control signal and the group horizontal dot inversion signal determine a polarity and a horizontal dot inversion method of a data voltage group corresponding to the data wiring group. LCD display device. The method of claim 1, The group driving unit, A DAC unit for converting the image data into the data voltage in response to the group polarity control signal and the group horizontal dot in version signal; An output buffer unit for amplifying the converted data voltage and outputting the amplified data voltage to the data line; And a group charge share unit configured to perform a charge share on / off operation for the data line group in response to the group charge share control signal. LCD display device. The method of claim 1, And a group controller configured to generate the group polarity control signal, the group horizontal dot inversion signal, and the group charge control signal, and control the group driver. The group control unit, For the data voltage group, the average of the absolute value of the variation of the data voltages when the charge share operation is performed and the average of the absolute values of the variation of the data voltage voltages when the charge share on operation are performed are compared. Controlling an operation corresponding to a lower value among absolute values of absolute values of the variation amounts of the data voltages to be performed LCD display device. The method of claim 3, wherein The group control unit, For the data voltage group, the DC component in the horizontal 1-dot inversion scheme and the DC component in the horizontal 2-dot inversion scheme are compared, Among the DC components, a horizontal dot inversion method corresponding to a value close to a common voltage is controlled to be performed. LCD display device. The method of claim 3, wherein The group control unit, As the polarity of the data voltage group, controlling the average of the DC components of all the data voltage groups of the row line to have a polarity that is close to the common voltage. LCD display device. A plurality of data wires belonging to each of the plurality of data wire groups and extending along the column direction; A driving method of a liquid crystal display device comprising a data driver including a group driver corresponding to the data wiring group. In the group driver, converting image data into a data voltage in response to a group polarity control signal and a group horizontal dot in version signal and outputting the data to each of a plurality of data wirings of the data wiring group; In the group driver, performing a charge share on / off operation for the data wiring group in response to a group charge share control signal, The group polarity control signal and the group horizontal dot inversion signal determine a polarity and a horizontal dot inversion method of a data voltage group corresponding to the data wiring group. Liquid crystal display driving method. The method of claim 6, Amplifying the converted data voltage and outputting the converted data voltage to the data line; Liquid crystal display driving method. The method of claim 6, The method may further include controlling a charge share on / off operation of the group driver. The controlling of the charge share on / off operation may include: Comparing the average of the absolute values of the variation amounts of the data voltages when the charge share operation is performed with the average of the absolute values of the variation amounts of the data voltage voltages when the charge share operation is performed; Controlling an operation corresponding to a lower value among absolute values of absolute values of the variation amounts of the data voltages; Liquid crystal display driving method. The method of claim 6, And controlling a horizontal dot inversion scheme of the data voltage group. Controlling the horizontal dot inversion method, Comparing the DC component in the horizontal one-dot inversion scheme with the DC component in the horizontal two-dot inversion scheme for the data voltage group; Controlling the horizontal dot inversion scheme corresponding to a value close to a common voltage among the DC components; Liquid crystal display driving method. The method of claim 6, Controlling the polarity of the data voltage group; Controlling the polarity, Controlling, as a polarity of the data voltage group, a polarity such that an average of DC components of all data voltage groups of a row line is close to a common voltage; Liquid crystal display driving method.

Images