KR101222983B1 - LCD and drive method thereof - Google Patents

Abstract

The present invention provides a liquid crystal display that can convert the luminance between a neighboring region of the odd-numbered frame and the even-numbered frame by dividing all the pixels into a plurality of regions during double-speed driving of the frame frequency. Doubles the frame frequency of the current frame to generate the assigned odd-numbered and even-numbered frames, divides the assigned odd-numbered and even-numbered pixels into constant regions, and divides the odd-numbered number of the assigned odd-numbered frames. Convert the pixels located in the region to the first grayscale, convert the pixels located in the even-numbered region to the second grayscale, convert the pixels located in the odd-numbered region of the assigned even-numbered frame to the second grayscale, and place the pixels in the even-numbered region. Frame processing means for converting pixels into first grayscales; Timing control means for controlling the driving timing of the odd-numbered frame having the gray scale value assigned and converted by the frame processing means; And data driving means for driving the assigned odd-numbered frame and even-numbered frame to the liquid crystal display panel continuously within a predetermined time under the control of the timing control means.

LCD, frame frequency, double speed, area, luminance

Description

Liquid crystal display and driving method thereof

1 is an equivalent circuit diagram of a pixel formed in a general liquid crystal display device.

2 is a configuration diagram of a general liquid crystal display device.

3A is a characteristic diagram illustrating a change in luminance for each frame of a conventional liquid crystal display device to which a frame frequency double speed method is applied.

3B is a luminance characteristic diagram of a backlight assembly of a conventional liquid crystal display device to which a frame frequency double speed method is applied.

4 is a configuration diagram of a liquid crystal display device according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of the frame processor shown in FIG. 4. FIG.

6 is a gray scale conversion characteristic diagram of a liquid crystal display according to the present invention;

7 is a configuration diagram of the frequency converter shown in FIG.

8 is a configuration diagram of a gray value calculator shown in FIG. 5;

9 is a block diagram of a liquid crystal display according to another exemplary embodiment of the present invention.

FIG. 10 is a configuration diagram of the frame processor shown in FIG. 9. FIG.

11 is a block diagram of a liquid crystal display according to another embodiment of the present invention.

FIG. 12 is a configuration diagram of the frame processor shown in FIG. 11. FIG.

13 is a characteristic diagram showing luminance conversion per frame of the liquid crystal display according to the present invention.

14A and 14B are exemplary views showing operating characteristics of the liquid crystal display of the present invention shown in FIG.

15A and 15B are exemplary views showing operating characteristics of the liquid crystal display of the present invention shown in FIG.

Explanation of symbols on the main parts of the drawings

100, 200, 300, and 400: liquid crystal display 110: liquid crystal display panel

120, 230, 330, 430: data driver

130, 240, 340, 440: gate driver

140: gamma reference voltage generator 150: backlight assembly

160: inverter 170: common voltage generator

180: gate driving voltage generator

190, 220, 320, 420: timing controller

210, 310, 410: Frame Processor

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device. In particular, a liquid crystal display capable of converting all of the pixels into a plurality of regions during double speed driving of a frame frequency so as to convert the luminance between neighboring regions of the odd-numbered frame and the even-numbered frame oppositely. An apparatus and a driving method thereof are provided.

A liquid crystal display device displays an image by adjusting light transmittance of liquid crystal cells according to a video signal, and an active matrix type liquid crystal display device in which a switching element is formed for each liquid crystal cell enables active control of the switching element. This is advantageous for video implementation. As the switching element used in the active matrix liquid crystal display device, a thin film transistor (hereinafter referred to as TFT) is mainly used as shown in FIG. 1.

Referring to FIG. 1, an active matrix type liquid crystal display converts digital input data into an analog data voltage based on a gamma reference voltage and supplies it to the data line DL and simultaneously supplies scan pulses to the gate line GL. The liquid crystal cell Clc is charged.

The gate electrode of the TFT is connected to the gate line GL, the source electrode is connected to the data line DL, and the drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell Clc and one electrode of the storage capacitor Cst. Connected.

A common voltage Vcom is supplied to the common electrode of the liquid crystal cell Clc.

The storage capacitor Cst serves to charge the data voltage applied from the data line DL when the TFT is turned on to maintain the voltage of the liquid crystal cell Clc constant.

When a scan pulse is applied to the gate line GL, the TFT is turned on to form a channel between the source electrode and the drain electrode to apply a voltage on the data line DL to the pixel electrode of the liquid crystal cell Clc Supply. At this time, the liquid crystal molecules of the liquid crystal cell Clc modulate the incident light by changing the arrangement by the electric field between the pixel electrode and the common electrode.

A configuration of a general liquid crystal display device having pixels having such a structure will be described with reference to FIG. 2.

2 is a configuration diagram of a general liquid crystal display device.

Referring to FIG. 2, the liquid crystal display device 100 includes a thin film transistor TFT for driving data lines DL1 to DLm and gate lines GL1 to GLn and driving the liquid crystal cell Clc at an intersection thereof. A liquid crystal display panel 110 having a thin film transistor, a data driver 120 for supplying data to the data lines DL1 to DLm of the liquid crystal display panel 110, and a gate of the liquid crystal display panel 110. A gate driver 130 for supplying scan pulses to the lines GL1 to GLn, a gamma reference voltage generator 140 for generating a gamma reference voltage and supplying it to the data driver 120, and a liquid crystal display panel 110. ) Generates a backlight assembly 150 for irradiating light, an inverter 160 for applying an alternating voltage and current to the backlight assembly 160, and a common voltage Vcom to generate liquid crystals of the liquid crystal display panel 110. A common voltage generator 170 for supplying the common electrode of the cell Clc, A timing for controlling the gate driving voltage generator 180 for generating the high voltage VGH and the gate low voltage VGL and supplying the gate voltage 130 to the gate driver 130, and for controlling the data driver 120 and the gate driver 130. The controller 190 is provided.

In the liquid crystal display panel 110, liquid crystal is injected between two glass substrates. On the lower glass substrate of the liquid crystal display panel 110, the data lines DL1 to DLm and the gate lines GL1 to GLn are orthogonal. TFTs are formed at intersections of the data lines DL1 to DLm and the gate lines GL1 to GLn. The TFT supplies the data on the data lines DL1 to DLm to the liquid crystal cell Clc in response to the scan pulse. The gate electrodes of the TFTs are connected to the gate lines GL1 to GLn, and the source electrodes of the TFTs are connected to the data lines DL1 to DLm. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell Clc and the storage capacitor Cst.

The TFT is turned on in response to the scan pulse supplied to the gate terminal via the gate lines GL1 to GLn. When the TFT is turned on, video data on the data lines DL1 to DLm is supplied to the pixel electrode of the liquid crystal cell Clc.

The data driver 120 supplies data to the data lines DL1 to DLm in response to the data driving control signal DDC supplied from the timing controller 190, and digital video data supplied from the timing controller 190. After sampling and latching the RGB, the liquid crystal cell Clc of the liquid crystal display panel 110 is converted into an analog data voltage capable of expressing gray scale based on the gamma reference voltage supplied from the gamma reference voltage generator 140. Supply to the data lines DL1 to DLm.

The gate driver 130 sequentially generates scan pulses, that is, gate pulses, in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 190, thereby providing the gate lines GL1 to GLn. To feed. In this case, the gate driver 130 determines the high level voltage and the low level voltage of the scan pulse based on the gate high voltage VGH and the gate low voltage VGL supplied from the gate driving voltage generator 180.

The gamma reference voltage generator 140 receives a high potential power supply voltage VDD to generate a positive gamma reference voltage and a negative gamma reference voltage and output the same to the data driver 120.

The backlight assembly 150 is disposed on the rear surface of the liquid crystal display panel 110 and emits light by an AC voltage and a current supplied from the inverter 160 to irradiate light to each pixel of the liquid crystal display panel 110.

The inverter 160 converts the square wave signal generated therein into a triangular wave signal and compares the triangular wave signal with a DC power supply voltage (VCC) supplied from the system to generate a burst dimming signal proportional to the comparison result. . When a burst dimming signal determined according to an internal square wave signal is generated, a driving IC (not shown) for controlling the generation of AC voltage and current in the inverter 160 is supplied to the backlight assembly 150 according to the burst dimming signal. Control the generation of alternating voltage and current.

The common voltage generator 170 receives the high potential power voltage VDD to generate the common voltage Vcom and supplies the common voltage Vcom to the common electrodes of the liquid crystal cells Clc of each pixel of the liquid crystal display panel 110.

The gate driving voltage generator 180 receives the high potential power voltage VDD to generate the gate high voltage VGH and the gate low voltage VGL to supply the gate driver 130 to the gate driver 130. Here, the gate driving voltage generation unit 180 generates a gate high voltage VGH that is greater than or equal to a threshold voltage of the TFTs provided in each pixel of the liquid crystal display panel 110, and a gate low voltage (below the threshold voltage of the TFT). VGL). The gate high voltage VGH and the gate low voltage VGL generated in this way are used to determine the high level voltage and the low level voltage of the scan pulse generated by the gate driver 130, respectively.

The timing controller 190 supplies digital video data RGB, which is supplied from a digital video card (not shown), to the data driver 120, and also horizontal / vertical synchronization signals H and V according to the clock signal CLK. The data driving control signal DDC and the gate driving control signal GDC may be generated and supplied to the data driver 120 and the gate driver 130, respectively. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

The liquid crystal display device 100 having such a configuration and function is generally driven at 60 Hz, but in recent years, a technique for driving the liquid crystal display device 100 at 120 Hz has been developed in order to improve moving images.

In the description of the frame frequency double speed technology, two frames are continuously driven within a predetermined time by using one frame input from the system, and one frame among the generated frames is displayed brightly and the other Darken the frame.

When the frame frequency is doubled in this manner, the luminance characteristics of the assigned frames are changed as shown in FIG. 3A, but the luminance characteristics of the backlight assembly 150 remain constant without change as shown in FIG. 3B.

Referring to FIG. 3A, when a frame frequency is doubled and a frame is driven, the LCD panel 110 includes a dark screen A1 having a low luminance value, a bright screen A2 having a high luminance value, and a dark screen ( An intermediate brightness screen A3 having an intermediate luminance value between A1) and the bright screen A2 is displayed.

However, in the conventional liquid crystal display device to which the frame frequency double speed method is applied, the luminance B1 of the backlight assembly 150 is changed as shown in FIG. 3B, unlike changing the luminance value of the pixels of the doubled frames during double speed driving of the frame frequency. ) Is kept constant irrespective of the luminance of the pixels of the assigned frames, so that the luminance change of the pixels of the assigned frames is visually felt to the viewer.

In addition, when the liquid crystal display is driven at 120 Hz, gray data conversion is performed while maintaining the average luminance of two frames to be the same as that of one frame when driven at 60 Hz. There is a problem that a flicker occurs due to a large luminance difference.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to classify all pixels into a plurality of areas during double speed driving of a frame frequency so that luminance between neighboring areas of the odd-numbered frame and the even-numbered frame is doubled. To provide a liquid crystal display device and a driving method thereof that can be converted to the opposite.

An object of the present invention is to divide all the pixels into a plurality of areas during double-speed driving of the frame frequency to convert the luminance between the neighboring area of the odd-numbered frame and the even-numbered frame oppositely, thereby preventing the screen drag and flicker A liquid crystal display device and a driving method thereof are provided.

In order to achieve the above object, the present invention is to double the frame frequency of an input current frame to generate a doubled odd numbered frame and even-numbered frame, and to define pixels of the doubled odd numbered frame and even-numbered frame. And convert pixels located in the odd-numbered region of the assigned odd-numbered frame to the first grayscale, convert pixels located in the even-numbered region to the second grayscale, and locate the odd-numbered region of the assigned even-numbered frame. Frame processing means for converting pixels to a second gray scale and converting pixels located in an even-numbered region to a first gray scale; Timing control means for controlling the driving timing of the odd-numbered frame having the gray scale value assigned and converted by the frame processing means; And data driving means for driving the assigned odd-numbered frame and even-numbered frame to the liquid crystal display panel continuously within a predetermined time under the control of the timing control means. Here, the first gradation is high gradation, and the second gradation is characterized in that the low gradation.

The frame processing means may include: a frequency converter for doubling the frame frequency of the input current frame and continuously outputting the assigned odd-numbered frame and even-numbered frame within a predetermined time period; Among the pixels of the assigned odd-numbered frame, a high gray scale conversion value of pixels located in an odd-numbered vertical line region and a low-gray scale conversion value of pixels located in an even-numbered vertical line region are calculated, and among the pixels of the even-numbered even frame, A gray scale value calculator for calculating low gray scale conversion values of pixels located in odd-numbered vertical line areas and high gray scale conversion values of pixels located in even-numbered vertical line areas; And converting the gradations of pixels located in the odd-numbered vertical line region among the assigned odd-numbered frames to a calculated high gradation conversion value and converting the gradations of pixels located in the even-numbered vertical line region to the calculated low gradation conversion value. And converts the gradations of pixels located in the odd-numbered vertical line region among the pixels of the even-numbered frame to shift to the calculated low gradation conversion value, and converts the gradations of pixels located in the even-numbered vertical line region. And a gradation converter for shifting and converting the calculated high gradation conversion value.

The gray value calculator is characterized by dividing pixels of odd-numbered and even-numbered frames consecutively input from the frequency converter by vertical line regions.

The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered vertical line regions among the pixels of the odd-numbered frame, and odd-numbered and even-numbered vertical lines among the pixels of the even-numbered even frame. The gray value of the pixels located in the area is detected.

The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd-numbered vertical line region among the pixels of the assigned odd-numbered frame and a predetermined reference gradation value. The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the even-numbered vertical line region among the pixels of the frame may be output to the gray scale converter.

The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd-numbered vertical line region among the pixels of the even-numbered even-frame. The grayscale value detected in the even-numbered vertical line region among the pixels of the first frame may be calculated by adding a predetermined grayscale value to be converted and output to the grayscale converter.

The frame processing unit may further include: a frequency converter configured to double the frame frequency of the input current frame to continuously output the assigned odd-numbered frame and even-numbered frame within a predetermined time; Among the pixels of the assigned odd-numbered frame, a high grayscale conversion value of pixels located in an odd-numbered horizontal line region and a low-grayscale conversion value of pixels located in an even-numbered horizontal line region are calculated, and among the pixels of the even-numbered even-numbered frame, A gray level calculator for calculating a low gray scale conversion value of pixels located in an odd horizontal line area and a high gray scale conversion value of pixels located in an even horizontal line area; And converting the gradation of the pixels located in the odd-numbered horizontal line region among the assigned odd-numbered frames to the calculated high gradation conversion value and converting the gradations of the pixels located in the even-numbered horizontal line region. And converts the gradations of pixels located in the odd-numbered horizontal line region among the assigned even-numbered frames to the calculated low gradation conversion value, and converts the gradations of pixels located in the even-numbered horizontal line region. And a gradation converter for shifting and converting the calculated high gradation conversion value.

The gray value calculator is characterized by dividing pixels of odd-numbered and even-numbered frames consecutively inputted from the frequency converter by a horizontal line region.

The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered horizontal line regions among the pixels of the odd-numbered frame, and odd-numbered and even-numbered horizontal lines among the pixels of the even-numbered even frame. The gray value of the pixels located in the area is detected.

The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd-numbered horizontal line region among the pixels of the assigned odd-numbered frame and a predetermined reference gradation value. The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the even-numbered horizontal line region among the pixels of the frame may be output to the gray scale converter.

The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd-numbered horizontal line region among the pixels of the even-numbered even-numbered frame, The grayscale value detected in the even-numbered horizontal line region among the pixels of the first frame is added to the grayscale value to be converted by calculating the high gray scale conversion value to be converted and output to the gray scale converter.

The frame processing unit may further include: a frequency converter configured to double the frame frequency of the input current frame to continuously output the assigned odd-numbered frame and even-numbered frame within a predetermined time; Among the pixels of the assigned odd frame, a high gray scale conversion value of pixels located in an odd subpixel area and a low gray scale conversion value of pixels located in an even subpixel area are calculated, and among the pixels of the even-numbered frame, A gradation value calculator for calculating low gradation conversion values of pixels located in the odd subpixel area and high gradation conversion values of pixels located in the even subpixel area; And converting the gradations of the pixels located in the odd subpixel region among the assigned odd-numbered frames to the calculated high gradation conversion value and converting the gradations of the pixels located in the even subpixel region. And converts the grayscales of pixels located in the odd subpixel region among the assigned even-numbered frames to the calculated low grayscale conversion value, and converts the grayscales of pixels located in the even-numbered subpixel region. And a gradation converter for shifting and converting the calculated high gradation conversion value.

The gray scale value calculator classifies pixels of odd-numbered and even-numbered frames that are continuously input from the frequency converter within each sub-pixel area.

The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered sub-pixel areas of the assigned odd-numbered frames, and odd-numbered and even-numbered sub-pixels among the pixels of the even-numbered even-numbered frame. The gray value of the pixels located in the area is detected.

The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd sub-pixel region among the pixels of the assigned odd frame and a predetermined reference gradation value, and then performs the assigned radix number. The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the even-numbered sub-pixel area among the pixels of the frame may be output to the gray scale converter.

The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd sub-pixel area among the pixels of the even-numbered even-numbered frame. The grayscale value detected in the even subpixel area among the pixels of the first frame and the predetermined reference grayscale value are added to calculate a high gray scale conversion value to be converted and output to the gray scale converter.

The frequency converter may include: a storage unit for temporarily storing the input current frame; And a frequency conversion controller for temporarily storing the input current frame in the storage unit and continuously reading and outputting the frame of the storage unit within a predetermined time so that a first frame frequency is doubled to a second frame frequency. Here, the first frame frequency is 60Hz, the second frame frequency is characterized in that 120Hz.

The present invention includes the steps of: generating a doubled odd numbered frame and an even numbered frame by speeding a frame frequency of an input current frame; Dividing the assigned odd-numbered and even-numbered pixels into constant regions; Convert the pixels located in the odd-numbered region of the assigned odd-numbered frame to the first grayscale, convert the pixels located in the even-numbered region to the second grayscale, and remove pixels located in the odd-numbered region of the assigned even-numbered frame. Converting to two gray levels and converting pixels located in even-numbered regions to first gray scale; And driving the odd-numbered frame and the even-numbered frame having the doubled and converted gray scale value to the liquid crystal display panel continuously within a predetermined time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of a liquid crystal display device according to an embodiment of the present invention. However, the liquid crystal display device 200 according to the exemplary embodiment of the present invention may have a gamma reference voltage generator 140, a backlight assembly 150, and an inverter in the same manner as the liquid crystal display device 100 shown in FIG. 2. 160, a common voltage generator 170, and a gate driving voltage generator 180, but these components are not shown in FIG. 4 for convenience of description.

Referring to FIG. 3, the liquid crystal display 200 of the present invention multiplies the frame frequency of the input current frame to generate an odd-numbered frame and an even-numbered frame, and odd number of pixels of the assigned odd-numbered frame. Convert pixels located in the first vertical line region to high gradation, convert pixels located in the even vertical line region to low gradation, and convert pixels located in the odd vertical line region among the pixels of the even-numbered even-numbered frame to low gradation And control the driving timing of the odd-numbered frame and the odd-numbered frame having the grayscale value assigned and converted by the frame processor 210 and the frame processor 210 for converting the pixels located in the even-numbered vertical line region to high gradation. The frame processor 2 according to the timing controller 220 and the frame drive control signal from the timing controller 220. A data driver 230 and a timing controller 220 for continuously driving the odd-numbered frame and the even-numbered frame having the gray scale value converted by 10) to the liquid crystal display panel 110 within a predetermined time period. A gate driver 240 for sequentially generating scan pulses in response to the gate driving control signal and supplying the scan pulses to the gate lines GL1 to GLn is provided.

The frame processor 210 doubles the frame frequency of the current frame input from the system to generate the assigned odd and even frames that are continuously driven within a predetermined time.

After the frame frequency is assigned, the frame processor 210 performs a high gray level conversion value of pixels located in odd-numbered vertical line areas among the pixels of the odd-numbered frame and a low gray level conversion value of pixels located in even-numbered vertical line areas. The low gray scale conversion value of the pixels located in the odd-numbered vertical line region and the high gray scale conversion value of the pixels located in the even-numbered vertical line region among the pixels of the even-numbered frame are calculated.

After the grayscale conversion value is calculated, the frame processor 210 shifts and converts the grayscales of the pixels located in the odd-numbered vertical line region among the pixels of the odd-numbered frame to the calculated high grayscale transformation value and even-numbered vertical line region. The gray level of the pixels located at is shifted to the calculated low gray level conversion value, and the gray level of pixels located in the odd-numbered vertical line region among the pixels of the even-numbered even frame is shifted to the calculated low gray level conversion value. The gray level of the pixels positioned in the even-numbered vertical line region is shifted to the calculated high gray level conversion value, and then converted and output to the timing controller 220.

The timing controller 220 outputs the odd-numbered frame and the even-numbered frame, which are assigned by the frame processor 210 and whose gradation value is converted, to the data driver 230, and simultaneously output the frame drive control signal FCS to the data driver 230. ) To control the frame driving timing of the data driver 230. In addition, the timing controller 220 uses the horizontal / vertical synchronization signals H and V from the system to output the data driving control signal DDC and the gate driving control signal GDC according to the clock signal CLK from the system. Are generated and supplied to the data driver 230 and the gate driver 240, respectively. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

The data driver 230 continuously stores the odd-numbered frame and the even-numbered frame having the gray scale value assigned and converted by the frame processor 210 in response to the frame drive control signal FCS from the timing controller 220 within a predetermined time. By driving to the liquid crystal display panel 110.

The gate driver 240 sequentially generates scan pulses in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 220 and supplies them to the gate lines GL1 to GLn. In particular, the gate driver 240 sequentially supplies scan pulses to the gate lines GL1 to GLn while the odd-numbered and odd-numbered frames are driven by the frame processor 210. After that, the scan pulse is sequentially supplied to the gate lines GL1 to GLn while the even-numbered frame is driven again.

FIG. 5 is a configuration diagram of the frame processor shown in FIG. 4.

Referring to FIG. 5, the frame processor 210 may double the frame frequency of an input current frame, and a frequency converter 211 for continuously outputting the assigned odd and even frames within a predetermined time. Calculates the high gray level conversion value of the pixels located in the odd-numbered vertical line region among the pixels of the odd frame and the low gray level conversion value of the pixels located in the even-numbered vertical line region. A gray level calculator 212 for calculating a low gray level conversion value of the pixels located in the area and a high gray level conversion value of the pixels located in the even-numbered vertical line area, and an odd-numbered vertical line area among the pixels of the assigned odd frame Pixels of the pixels located in the even-numbered vertical line region by converting the gradations of the pixels located at to the calculated high gradation conversion value. The gradation is converted to the calculated low gradation value, and the gradation of pixels located in the odd-numbered vertical line region among the pixels of the even-numbered frame is shifted to the calculated low gradation value and converted to the even-numbered vertical line. And a gradation converter 213 for translating and converting the gradations of pixels located in the region to the calculated high gradation conversion value.

The frequency converter 211 temporarily stores the input current frame, doubles the first frame frequency to the second frame frequency, continuously reads the stored frame within a predetermined time, and outputs the stored frame to the gray value calculator 212. Here, the frequency converter 211 doubles the frame frequency by a dynamic data insertion (DDI) method. More specifically, the frequency converter 211 temporarily stores the input current frame and reads it twice within a predetermined time to continuously read the same frame. Output it.

When the current frame is input through the frame input terminal, the frequency converter 211 converts the first frame frequency of 60 Hz to the second frame frequency of 120 Hz, but the present invention is not limited thereto. For example, the frequency converter 211 may be implemented to convert a first frame frequency of 50 Hz into a second frame frequency of 60 Hz.

The gray scale calculator 212 classifies pixels of the odd-numbered frame and the even-numbered frame which are continuously input from the frequency converter 211 for each vertical line region, wherein the pixels located in one vertical line It is divided into vertical areas. After the pixels of the odd-numbered frame and the even-numbered frame are divided by vertical line regions, the grayscale calculator 212 may adjust the grayscale values of pixels located in the odd-numbered vertical line regions among the pixels of the assigned odd-numbered frames. After the detection, the gray level value to be converted is calculated using the detected gray level value and the predetermined reference gray level value, and the gray level value calculator 212 further includes an even-numbered vertical line among the pixels of the odd-numbered frame. After detecting the gray scale values of the pixels located in the area, a low gray scale conversion value to be converted using the detected gray scale value and a predetermined reference gray scale value is calculated and output to the gray scale converter 213.

After the grayscale conversion value of the assigned odd-numbered frame is calculated, the grayscale value calculator 212 detects grayscale values of pixels located in the odd-numbered vertical line region among the pixels of the even-numbered even-numbered frame and then detects the grayscale value. And a low gray scale conversion value to be converted using a predetermined reference gray scale value, and the gray scale value calculator 212 further includes gray scale values of pixels located in even-numbered vertical line regions among the even-numbered even-numbered frames. Is detected, and the high gray scale conversion value to be converted is calculated using the detected gray scale value and the predetermined reference gray scale value, and output to the gray scale converter 213.

Here, the gray scale calculator 212 calculates a low gray scale conversion value to be converted by subtracting a predetermined reference gray value from the detected gray value and adds the predetermined reference gray value to the detected gray value to convert it. A high gradation conversion value is calculated. For example, if the detected gradation value is '50 gradation 'and the predetermined reference gradation value is' 8 gradation ', the gradation value calculator 212 determines the predetermined reference gradation value' 8 'from the detected gradation value '50 gradation'. 'Gradation' is calculated by subtracting 'Gradation' by subtracting 'Gradation'. Output to (213).

The gradation converter 213 transitions the gradations of pixels located in the odd-numbered vertical line region among the pixels of the odd-numbered frame to the high gradation conversion value calculated by the gradation value calculator 212, and also converts the gradation converter. In operation 213, the gray level of the pixels in the even-numbered vertical line region among the assigned odd-numbered frames is shifted and converted to the low gray scale conversion value calculated by the gray scale value calculator 212 to the timing controller 220. Output

After the grayscale conversion of the assigned odd frame is performed, the grayscale converter 213 calculates the grayscales of pixels located in the odd-numbered vertical line region among the pixels of the even-numbered even-numbered frame by the grayscale calculator 212. The gray scale converter 213 shifts the low gray scale conversion value, and the gray scale converter 213 calculates the gray scales of the pixels located in the even-numbered vertical line region among the even-numbered even-numbered frames. The converted value is shifted to be converted and output to the timing controller 220.

Here, the gray scale converter 213 calculates the gray scale value 'DG' of the pixel calculated by the gray scale calculator 212 by the gray scale calculator 212 as shown in FIG. The gray scale value 'DG' of the pixel converted to the gray scale conversion value 'HG' and calculated by the gray scale calculator 212 as calculated in FIG. 6B is calculated by the gray scale calculator 212. Convert to low gradation value 'LG'. For example, if the gray value of the pixel of the assigned frame is '50 gray 'and the calculated low gray conversion value is '42 gray', the gray converter 213 sets the gray level of the pixel of the assigned frame to '42 gray '. Convert Also, if the gray value of the pixel of the assigned frame is '50 gray 'and the calculated high gray conversion value is' 58', the gray converter 213 converts the gray of the pixel of the frame to be '58'. .

As described above, in the liquid crystal display according to the exemplary embodiment of the present invention, when the frame frequency is driven at the double speed, the gray level of the pixels located in the odd-numbered vertical line region among the pixels of the odd-numbered frame is converted into a high gray level and the odd number is used. The gray level of the pixels located in the vertical line area and the adjacent even-numbered vertical line area is converted to the low gray level, and the gray level of the pixels located in the odd-numbered vertical line area among the even-numbered even-numbered frames is converted to the low gray level. By converting the gradations of pixels located in the odd-numbered vertical line region and the adjacent even-numbered vertical line region to high gradation, the odd-numbered vertical line region of the assigned odd-numbered frame as shown in FIG. 14A is brightly driven and contrasted. Driving the even-numbered vertical line region darkly, and as shown in FIG. The odd-numbered vertical line region of the even-numbered frame is darkly driven and the even-numbered vertical line region of the even-numbered frame doubled to be brightly driven. As described above, the present invention converts the luminance between the adjacent odd-numbered frame and the neighboring area of the even-numbered frame to the contrary, thereby preventing drag and flicker of the screen.

FIG. 7 is a configuration diagram of the frequency converter shown in FIG. 5.

Referring to FIG. 7, the frequency converter 211 temporarily stores the input current frame in the storage 211-1 and temporarily stores the input current frame in the storage 211-1. And a frequency conversion control unit 211-2 for continuously reading out and outputting the frame of the storage unit 211-1 twice in a predetermined time so that one frame frequency is doubled to the second frame frequency.

The storage unit 211-1 may be implemented as a virtual memory as a memory device for storing frame information. The storage 211-1 temporarily stores the current frame written by the frequency conversion controller 211-2.

When the current frame is input through the frame input terminal, the frequency conversion controller 211-2 temporarily stores the current frame in the storage unit 211-1, and then reads the frame of the storage unit 211-1 twice within a predetermined time. The first frame frequency is converted into a second frame frequency by outputting the result to the gray scale calculator 212 continuously.

FIG. 8 is a configuration diagram of a gray value calculator shown in FIG. 5.

Referring to FIG. 8, the gray value calculator 212 includes an area discriminating unit 212-1, a first gray level calculating unit 212-2, and a second gray level calculating unit 212-3. .

The area discriminating unit 212-1 divides pixels of the odd-numbered frame and the even-numbered frame which are continuously input from the frequency converter 211 for each vertical line region, wherein one pixel located on one vertical line It is divided into vertical areas of.

After the assigned odd-numbered frame and the even-numbered frame are divided by the area discriminating unit 212-1 for each vertical line region, the first gray level calculator 212-2 performs a division among the pixels of the assigned odd-numbered frame. Detects the grayscale values of pixels located in the odd-numbered vertical line region divided by the region discriminator 212-1, and calculates a high gray scale conversion value to be converted by using the detected grayscale value and a predetermined reference grayscale value. The first gray level calculator 212-2 also outputs the gray level of pixels located in the even-numbered vertical line region divided by the area discriminating unit 212-1 among the pixels of the odd-numbered frame. After detecting the value, a low gray scale conversion value to be converted is calculated using the detected gray scale value and the predetermined reference gray scale value, and output to the gray scale converter 213.

After the gray level conversion value of the assigned odd frame is calculated, the second gray level calculator 212-3 is applied to the odd-numbered vertical line region by the area discriminator 212-1 among the pixels of the even-numbered even frame. After detecting the gray value of the pixels located, the low gray conversion value to be converted is calculated by using the detected gray value and the predetermined reference gray value, and then output to the gray scale converter 213. -3) detects the gray level values of the pixels located in the even-numbered vertical line region by the area discriminating unit 212-1 among the pixels of the even-numbered frame, and uses the detected gray level value and the predetermined reference gray value. The high gray scale conversion value to be converted is calculated and output to the gray scale converter 213.

Here, the first and second gray scale calculation units 212-2 and 212-3 calculate a low gray scale conversion value to be converted by subtracting a predetermined reference gray value from the detected gray scale value, and predetermined to the detected gray scale value. The high gray scale conversion value to be converted is calculated by adding the reference gray scale value of. For example, when the detected grayscale value is '50 grayscale 'and the predetermined reference grayscale value is' 8 grayscale', the first and second grayscale calculators 212-2 and 212-3 detect the grayscale value '50'. 'Gradation' is calculated by subtracting the predetermined grayscale value '8 grayscale' from the gray scale 'and calculating the low gray scale conversion value '42 grayscale', and adding the predetermined grayscale value '8 grayscale' to the detected grayscale value '50 grayscale '. The value '58 gradations' is calculated and output to the gradation converter 213.

9 is a configuration diagram of a liquid crystal display according to another exemplary embodiment of the present invention. However, the liquid crystal display device 300 according to another exemplary embodiment of the present invention may include the gamma reference voltage generator 140, the backlight assembly 150, and an inverter in the same manner as the liquid crystal display device 100 shown in FIG. 2. 160, a common voltage generator 170, and a gate driving voltage generator 180, but these components are not shown in FIG. 9 for convenience of description.

Referring to FIG. 9, the liquid crystal display device 300 of the present invention doubles the frame frequency of an input current frame to generate a doubled odd numbered frame and an even numbered frame, and odd number of pixels of the doubled odd numbered frame. Convert pixels located in the first horizontal line region to high gradation, convert pixels located in the even horizontal line region to low gradation, and convert pixels in odd horizontal line region among the even-numbered even-numbered frames to low gradation And control the driving timing of the odd-numbered and even-numbered frames having the frame processor 310 for converting the pixels located in the even-numbered horizontal line region to high gradation and the gray scale value assigned and converted by the frame processor 310. The frame processor 3 according to the timing controller 320 and the frame drive control signal from the timing controller 320. A data driver 330 and a timing controller 320 for continuously driving the odd-numbered frame and the even-numbered frame having the gray scale value converted by 10) to the liquid crystal display panel 110 within a predetermined time period. The gate driver 340 is configured to sequentially generate scan pulses in response to the gate driving control signal and to supply the gate lines GL1 to GLn.

The frame processor 310 doubles the frame frequency of the current frame input from the system to generate the assigned odd and even frames that are continuously driven within a predetermined time.

After the frame frequency is doubled, the frame processor 310 displays the high gray level conversion value of the pixels located in the odd horizontal line region among the pixels of the odd numbered frame and the low gray level conversion value of the pixels located in the even horizontal line region. The low gray level conversion value of the pixels located in the odd-numbered horizontal line region and the high gray level conversion value of the pixels located in the even-numbered horizontal line region among the pixels of the even-numbered frame are calculated.

After the gray scale conversion value is calculated, the frame processor 310 shifts and converts the gray levels of pixels located in the odd-numbered horizontal line region among the pixels of the odd-numbered frame to the calculated high gray scale conversion value and even-numbered horizontal line region. The gray level of the pixels located at is shifted to the calculated low gray level conversion value, and the gray level of pixels located in the odd-numbered horizontal line region among the pixels of the even-numbered even frame is shifted to the calculated low gray level conversion value. The gray level of pixels positioned in the even-numbered horizontal line region is shifted to the calculated high gray level conversion value, and converted to the gray level.

The timing controller 320 outputs the odd-numbered frame and the even-numbered frame, which are doubled by the frame processor 310 and the gray scale value is converted, to the data driver 330, and simultaneously output the frame drive control signal FCS to the data driver 330. ) To control the frame driving timing of the data driver 320. In addition, the timing controller 320 uses the horizontal / vertical synchronization signals H and V from the system to output the data driving control signal DDC and the gate driving control signal GDC according to the clock signal CLK from the system. Are generated and supplied to the data driver 330 and the gate driver 340, respectively. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

The data driver 330 continuously performs the odd-numbered frame and the even-numbered frame having the gray scale value assigned and converted by the frame processor 310 in response to the frame drive control signal FCS from the timing controller 320 within a predetermined time. By driving to the liquid crystal display panel 110.

The gate driver 340 sequentially generates scan pulses in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 320 to supply the gate lines GL1 to GLn. In particular, the gate driver 340 sequentially supplies scan pulses to the gate lines GL1 to GLn while the odd-numbered and odd-numbered frames are driven by the frame processor 310. After that, the scan pulse is sequentially supplied to the gate lines GL1 to GLn while the even-numbered frame is driven again.

FIG. 10 is a block diagram illustrating the frame processor shown in FIG. 9.

Referring to FIG. 10, the frame processor 310 may double the frame frequency of an input current frame to continuously output the odd-numbered and even-numbered frames within a predetermined time period, and a double speed. Calculates the high gray level conversion value of the pixels in the odd-numbered horizontal line region among the pixels of the odd-numbered frame and the low gray level conversion value of the pixels located in the even-numbered horizontal line region and A gray scale value calculator 311 for calculating a low gray scale conversion value of the pixels located in the line region and a high gray scale conversion value of the pixels located in the even-numbered horizontal line region, and an odd horizontal line among the pixels of the assigned odd frame The pixels located in the even-numbered horizontal line region are converted by shifting the gray levels of the pixels located in the region to the calculated high gray scale conversion value. Converts the grayscale of the pixel to the calculated low grayscale conversion value, and converts the grayscale of pixels located in the odd-numbered horizontal line region among the even-numbered even-numbered frames to the calculated low grayscale conversion value and then transforms the even-numbered horizontal And a gradation converter 312 for translating and converting the gradations of pixels located in the line region to the calculated high gradation conversion value.

The gray level calculator 311 classifies pixels of the odd-numbered frame and the even-numbered frame which are continuously input from the frequency converter 211 for each horizontal line area, wherein the pixels located in one horizontal line It is divided into vertical areas. After the pixels of the odd-numbered frame and the even-numbered frame are divided by the horizontal line region, the gray scale calculator 311 calculates the gray value of the pixels located in the odd-numbered horizontal line region among the pixels of the assigned odd-numbered frame. After the detection, the gray level value to be converted is calculated using the detected gray level value and the predetermined reference gray level value, and the gray level value calculator 311 further includes an even-numbered horizontal line among the pixels of the assigned odd-numbered frame. After detecting the gray value of the pixels located in the region, the low gray conversion value to be converted is calculated by using the detected gray value and the predetermined reference gray value, and then output to the gray converter 312.

After the grayscale conversion value of the assigned odd frame is calculated, the grayscale value calculator 311 detects grayscale values of pixels located in the odd-numbered horizontal line region among the pixels of the even-numbered even-numbered frame and then detects the grayscale value. And a low gray scale conversion value to be converted by using a predetermined reference gray scale value, and the gray scale value calculator 311 further includes gray scale values of pixels located in even-numbered horizontal line regions among the even-numbered even-numbered frames. Is detected, and the high gray scale conversion value to be converted is calculated using the detected gray scale value and the predetermined reference gray scale value, and output to the gray scale converter 312.

Here, the gray scale calculator 311 calculates a low gray scale conversion value to be converted by subtracting the predetermined gray scale value from the detected gray scale value, and adds the predetermined gray scale value to the detected gray scale value to convert it. A high gradation conversion value is calculated. For example, if the detected gradation value is '50 gradation 'and the predetermined reference gradation value is' 8 gradation ', the gradation value calculator 311 determines the predetermined reference gradation value' 8 'from the detected gradation value '50 gradation'. 'Gradation' is calculated by subtracting 'Gradation' by subtracting 'Gradation'. Output to (312).

The gradation converter 312 shifts and converts the gradations of pixels located in the odd-numbered horizontal line region among the pixels of the odd-numbered frame to the high gradation conversion value calculated by the gradation value calculator 311, and also converts the gradation converter. In operation 312, the gray level of the pixels in the even-numbered horizontal line region among the assigned odd-numbered frames is shifted to the low gray level conversion value calculated by the gray value calculator 311, and converted to the timing controller 320. Output

After the grayscale conversion of the assigned odd frame is performed, the grayscale converter 312 calculates the grayscales of the pixels located in the odd horizontal line region among the pixels of the even-numbered even-numbered frame by the grayscale calculator 311. The gradation converter 312 shifts the low gradation conversion value, and the gradation converter 312 calculates the gradations of the pixels located in the even-numbered horizontal line region among the pixels of the even-numbered frame assigned by the gradation value calculator 311. The converted value is shifted to be converted and output to the timing controller 320.

Here, the gray scale converter 312 calculates the gray scale value 'DG' of the pixel calculated by the gray scale calculator 311 by the gray scale calculator 311 as shown in FIG. The gray scale value 'DG' of the pixel converted to the gray scale conversion value 'HG' and calculated by the gray scale calculator 311 as calculated in FIG. 6B is calculated by the gray scale calculator 311. Convert to low gradation value 'LG'. For example, if the gray value of the pixel of the assigned frame is '50 gray 'and the calculated low gray conversion value is '42 gray', the gray scale converter 312 converts the gray of the pixel of the assigned frame to '42 gray '. Convert In addition, if the gray value of the pixel of the assigned frame is '50 gray 'and the calculated high gray conversion value is' 58', the gray converter 312 converts the gray of the pixel of the frame to be '58'. .

As described above, the liquid crystal display according to another exemplary embodiment of the present invention converts the grayscales of pixels located in the odd horizontal line region among the pixels of the odd-numbered frame to high grayscales at double-speed driving of the frame frequency. Converts the grayscales of the pixels located in the first horizontal line region and the neighboring even-numbered horizontal line region to low grayscale, and converts the grayscales of the pixels located in the odd-numbered horizontal line region among the assigned even-numbered frames to low grayscale. By converting the grayscales of pixels located in the odd-numbered horizontal line region and the adjacent even-numbered horizontal line region to high gradation, the odd-numbered horizontal line region of the assigned odd-numbered frame as shown in FIG. 15A is brightly driven and contrasted. Driving the even-numbered horizontal line region darkly, as shown in FIG. 15B. The bright thereby driving the even-numbered horizontal line area of the solid-th frame is an odd-numbered horizontal solid-th frame of the dark line area to be driven and compares these times the. As described above, the present invention converts the luminance between the adjacent odd-numbered frame and the neighboring area of the even-numbered frame to the contrary, thereby preventing drag and flicker of the screen.

11 is a configuration diagram of a liquid crystal display according to another exemplary embodiment of the present invention. However, in the liquid crystal display device 400 according to another exemplary embodiment of the present invention, the gamma reference voltage generator 140, the backlight assembly 150, and the inverter are the same as the liquid crystal display device 100 shown in FIG. 2. 160, a common voltage generator 170, and a gate driving voltage generator 180 are provided, but these components are not shown in FIG. 11 for convenience of description.

Referring to FIG. 11, the liquid crystal display device 400 of the present invention doubles the frame frequency of an input current frame to generate an odd-numbered frame and an even-numbered frame and odd number of pixels of the assigned odd-numbered frame. Convert pixels in the first sub-pixel region to high gradation, convert pixels in the even-numbered sub-pixel region to low gradation, and convert pixels in the odd-numbered sub-pixel region among the assigned even-numbered frames to low gradation. The frame processor 410 for converting pixels located in the even-numbered sub-pixel region to high gradation, and control the driving timing of the odd-numbered frame and the even-numbered frame having the gradation value assigned and converted by the frame processor 410. The frame processor according to the timing controller 420 and the frame drive control signal from the timing controller 420. A data driver 430 and a timing controller 420 for continuously driving the odd-numbered frame and the even-numbered frame having the gray scale value assigned and converted by the 410 to the liquid crystal display panel 110 within a predetermined time; The gate driver 440 may be configured to sequentially generate scan pulses in response to the gate driving control signal, and supply the scan pulses to the gate lines GL1 to GLn.

The frame processor 410 doubles the frame frequency of the current frame input from the system to generate the assigned odd and even frames that are continuously driven within a predetermined time.

After the frame frequency is assigned, the frame processor 410 may convert the high gray level conversion value of the pixels located in the odd subpixel area and the low gray level conversion value of the pixels located in the even subpixel area among the pixels of the assigned odd frame. The low gray scale conversion value of the pixels located in the odd subpixel area and the high gray scale conversion value of the pixels located in the even subpixel area among the pixels of the even-numbered frame are calculated.

After the gray scale conversion value is calculated, the frame processor 410 transitions and converts the grayscales of pixels located in the odd subpixel area among the odd-numbered preframe random pixels to the calculated high gray scale conversion value and even-numbered subpixel area. The gray level of the pixels located at is shifted to the calculated low gray level conversion value, and the gray level of pixels located in the odd-numbered subpixel region among the pixels of the even-numbered even frame is shifted to the calculated low gray level conversion value. The grays of the pixels located in the even-numbered sub-pixel regions are shifted to the calculated high gray scale conversion value, and are converted and output to the timing controller 420.

The timing controller 420 outputs the odd-numbered frame and the even-numbered frame, which are doubled by the frame processor 410 and the gray scale value is converted, to the data driver 430, and simultaneously output the frame drive control signal FCS to the data driver 430. ) To control the frame driving timing of the data driver 430. In addition, the timing controller 420 uses the horizontal / vertical synchronization signals H and V from the system to output the data driving control signal DDC and the gate driving control signal GDC according to the clock signal CLK from the system. Are generated and supplied to the data driver 430 and the gate driver 440, respectively. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

The data driver 430 consecutively stores the odd-numbered frame and the even-numbered frame having the gray scale value assigned and converted by the frame processor 410 in response to the frame driving control signal FCS from the timing controller 420 within a predetermined time. By driving to the liquid crystal display panel 110.

The gate driver 440 sequentially generates scan pulses in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 420 and supplies them to the gate lines GL1 to GLn. In particular, the gate driver 440 sequentially supplies scan pulses to the gate lines GL1 to GLn while the odd-numbered and odd-numbered frames are driven by the frame processor 410. After that, the scan pulse is sequentially supplied to the gate lines GL1 to GLn while the even-numbered frame is driven again.

12 is a block diagram of the frame processor shown in FIG. 11.

Referring to FIG. 12, the frame processor 410 is configured to double the frame frequency of the input current frame, and to convert the odd-numbered frame and even-numbered frame continuously within a predetermined time, Calculates the high gray scale conversion value of the pixels located in the odd subpixel area among the pixels of the odd frame and the low gray scale conversion value of the pixels located in the even subpixel area, and calculates the odd subpixel among the pixels of the even-numbered frame. A gray scale value calculator 411 for calculating a low gray scale conversion value of the pixels located in the area and a high gray scale conversion value of the pixels located in the even subpixel area, and an odd subpixel area among the pixels of the assigned odd frame. Pixels of the pixels located in even-numbered sub-pixel areas The gradation is converted to the calculated low gradation value, and the gradation of pixels located in the odd-numbered sub-pixel region among the assigned even-numbered frames is converted to the calculated low gradation value and converted to the even-numbered sub-pixel. A gray level converter 412 is provided for shifting and converting the gray level of the pixels positioned in the region to the calculated high gray level conversion value.

The gray level calculator 411 classifies pixels of the odd-numbered frame and the even-numbered frame which are continuously input from the frequency converter 211 for each sub-pixel area, wherein the pixels located in one sub-pixel are divided into one It is divided into vertical areas. After the pixels of the odd-numbered frame and the even-numbered frame are divided by sub-pixel regions, the gray scale calculator 411 calculates the gray-scale values of pixels located in odd-numbered sub-pixel regions among the pixels of the odd-numbered frame. After the detection, the high gray scale conversion value to be converted is calculated using the detected gray scale value and the predetermined reference gray scale value, and output to the gray scale converter 412. The gray scale calculator 411 also assigns the odd-numbered frame. After detecting the gray level values of the pixels in the even-numbered sub-pixel areas among the pixels of the pixel, the low gray level conversion value to be converted is calculated by using the detected gray level value and the predetermined reference gray level value, and then output to the gray level converter 412. do.

After the grayscale conversion value of the assigned odd frame is calculated, the grayscale value calculator 411 detects the grayscale value of pixels located in the odd subpixel area among the pixels of the even-numbered even frame and then detects the grayscale value. And a low gray scale conversion value to be converted by using a predetermined reference gray scale value and output to the gray scale converter 412. The gray scale calculator 411 also performs an even-numbered sub of pixels of the even-numbered even-numbered frame. After detecting the grayscale values of the pixels located in the pixel area, a high grayscale conversion value to be converted using the detected grayscale value and a predetermined reference grayscale value is calculated and output to the grayscale converter 412.

Here, the gray scale calculator 411 calculates a low gray scale conversion value to be converted by subtracting the predetermined gray scale value from the detected gray scale value, and adds the predetermined gray scale value to the detected gray scale value to convert it. A high gradation conversion value is calculated. For example, if the detected gradation value is '50 gradation 'and the predetermined reference gradation value is' 8 gradation ', the gradation value calculator 411 performs the predetermined reference gradation value' 8 'on the detected gradation value '50 gradation'. 'Gradation' is calculated by subtracting 'Gradation' by subtracting 'Gradation'. Output to (412).

The gray scale converter 412 transitions and converts the gray scales of the pixels located in the odd subpixel area among the pixels of the odd-numbered frame to the high gray scale conversion value calculated by the gray scale value calculator 411, and also the gray scale converter. In operation 412, the gray level of pixels in the even-numbered sub-pixel region among the assigned odd-numbered frames is shifted and converted to the low gray scale conversion value calculated by the gray scale value calculator 411 to the timing controller 420. Output

After the grayscale conversion of the assigned odd frame is performed, the grayscale converter 412 calculates the grayscales of the pixels located in the odd subpixel area among the pixels of the even-numbered even-numbered frame by the grayscale value calculator 411. The gradation converter 412 shifts the low gradation value, and the gradation converter 412 calculates the gradations of pixels located in the even subpixel area among the even-numbered even-numbered frames by the gradation value calculator 411. The converted value is shifted to be converted and output to the timing controller 420.

Here, the gray scale converter 412 calculates the gray scale value 'DG' of the pixel calculated by the gray scale calculator 411 and calculated by the gray scale calculator 411 as shown in FIG. The gray scale value 'DG' of the pixel converted to the gray scale conversion value 'HG' and calculated by the gray scale calculator 411 as shown in FIG. 6B is calculated by the gray scale calculator 411. Convert to low gradation value 'LG'. For example, when the gray value of the pixel of the assigned frame is '50 gray 'and the calculated low gray conversion value is '42 gray', the gray scale converter 412 sets the gray level of the pixel of the frame to be assigned to '42 gray '. Convert In addition, if the gray value of the pixel of the assigned frame is '50 gray 'and the calculated high gray conversion value is' 58', the gray converter 412 converts the gray of the pixel of the frame to be '58'. .

As described above, in the liquid crystal display according to another exemplary embodiment of the present invention, when the frame frequency is driven at a double speed, the gray level of pixels located in the odd subpixel area among the pixels of the doubled odd frame is converted into a high gray level, and this odd number is used. Convert the gray levels of the pixels located in the even subpixel area adjacent to the first subpixel area to low gray levels, and convert the gray levels of the pixels located in the odd subpixel area among the even-numbered even-numbered frames to low gray levels. By converting the grayscales of pixels located in the odd-numbered subpixel region and the neighboring even-numbered subpixel region to high gradation, the odd-numbered subpixel region of the assigned odd-numbered frame is brightly driven and the even-numbered subpixel region is contrasted. Driving dark, and occupying the odd subpixel area of the even-numbered frame Whole emerges darker and brighter drives driving the even-numbered sub-pixel region of the even-th frame to be a double speed compared to this. As described above, the present invention is capable of preventing the flickering and flicker of the screen by converting the luminance between the adjacent odd-numbered frame and the neighboring area of the even-numbered frame oppositely.

As described above, the present invention divides the pixels of the assigned odd-numbered frame and the even-numbered frame into regions having a constant pattern, and displays the luminance between neighboring regions of the assigned odd-numbered frame in opposition. As shown in A), the high and low luminance are repeatedly displayed between neighboring regions, and the luminance between neighboring regions of the even-numbered even-numbered frame is displayed oppositely, as shown in (B) of FIG. 13. High and low luminance are displayed repeatedly between the regions. In addition, the present invention displays the luminance between the same area of the odd-numbered and even-numbered frames opposite to each other so that high luminance between the same area of the odd-numbered and even-numbered frames doubled as shown in FIGS. 13A and 13B is shown. Allow low brightness to be displayed repeatedly.

Meanwhile, the present invention adjusts the luminance by dividing the pixels of the assigned frame by the vertical line region, the horizontal line region and the sub-pixel region, but the technical concept of the present invention is not limited thereto. That is, it is obvious that pixels of a frame assigned to implement the technical idea of the present invention may be divided into regions other than the vertical line region, the horizontal line region, and the sub-pixel region so that the luminance may be adjusted. The present invention converts the odd-numbered region of the assigned odd-numbered frame to high gradation, converts the even-numbered region to low gradation, and converts the odd-numbered region of the assigned even-numbered frame to low gradation and converts the even-numbered region. Although the present invention is not limited thereto, the present invention converts odd-numbered regions of the assigned odd-numbered frames to low-grayscales and odd-numbered numbers of even-numbered even-numbered frames by converting even-numbered regions to high-gradations. It may be implemented to convert the region to high gradation and to convert the even-numbered region to low gradation.

As described above, according to the present invention, all the pixels are divided into a plurality of areas during double-speed driving of the frame frequency, thereby converting the luminance between neighboring areas of the odd-numbered frame and the even-numbered frame to the opposite direction, thereby preventing the screen dragging phenomenon. Flicker can be prevented.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Claims (43)

Doubles the frame frequency of the input current frame to generate the assigned odd and even frames, divides the assigned odd and even frames into constant regions, and divides the assigned odd frame. Convert pixels located in the odd-numbered region to the first grayscale, convert pixels located in the even-numbered region to the second grayscale, convert pixels located in the odd-numbered region of the even-numbered even-numbered frame to the second grayscale, and even-numbered regions Frame processing means for converting pixels located in the first gray level; Timing control means for controlling the driving timing of the odd-numbered frame having the gray scale value assigned and converted by the frame processing means; And And data driving means for driving the assigned odd-numbered frame and even-numbered frame to the liquid crystal display panel continuously within a predetermined time under the control of the timing control means. The method of claim 1, And the first gray level is a high gray level, and the second gray level is a low gray level. The method of claim 1, The frame processing means, A frequency converter for doubling the input frame frequency of the current frame and continuously outputting the assigned odd-numbered and even-numbered frames within a predetermined time period; Among the pixels of the assigned odd-numbered frame, a high gray scale conversion value of pixels located in an odd-numbered vertical line region and a low-gray scale conversion value of pixels located in an even-numbered vertical line region are calculated, and among the pixels of the even-numbered even frame, A gray scale value calculator for calculating low gray scale conversion values of pixels located in odd-numbered vertical line areas and high gray scale conversion values of pixels located in even-numbered vertical line areas; And The gray level of the pixels in the odd-numbered vertical line region among the assigned odd-numbered frames is shifted to the calculated high gray scale conversion value, and the gray level of the pixels in the even-numbered vertical line region is converted to the calculated low gray scale conversion value. Transition by converting and converting the gray level of pixels located in the odd-numbered vertical line region among the assigned even-numbered frames to the calculated low gray level conversion value, and calculating the gray level of pixels located in the even-numbered vertical line region. And a gradation converter for shifting and converting the converted high gradation value. The method of claim 3, wherein The frequency converter, A storage unit for temporarily storing the input current frame; And And a frequency conversion controller configured to temporarily store the input current frame in the storage unit, and continuously read out the frame of the storage unit within a predetermined time and output the first frame frequency at a second frame frequency. . 5. The method of claim 4, And the first frame frequency is 60 Hz, and the second frame frequency is 120 Hz. The method of claim 3, wherein And the gray value calculator classifies pixels of odd-numbered frames and even-numbered frames continuously inputted from the frequency converter by vertical line regions. The method of claim 6, The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered vertical line regions among the pixels of the odd-numbered frame, and odd-numbered and even-numbered vertical lines among the pixels of the even-numbered even frame. And a gray value of pixels located in an area. The method of claim 7, wherein The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd-numbered vertical line region among the pixels of the assigned odd-numbered frame and a predetermined reference gradation value. And a low gray conversion value to be converted by subtracting the predetermined reference gray value from the gray level detected in the even-numbered vertical line region among the pixels of the frame, and outputting the low gray conversion value to the gray scale converter. 9. The method of claim 8, The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd-numbered vertical line region among the pixels of the even-numbered even-frame. And a high gray level conversion value to be converted by adding the gray level value detected in the even-numbered vertical line region among the pixels of the first frame, and outputting the high gray level conversion value to be converted to the gray level converter. . The method of claim 1, The frame processing means, A frequency converter for doubling the input frame frequency of the current frame and continuously outputting the assigned odd-numbered frame and even-numbered frame within a predetermined time period; Among the pixels of the assigned odd-numbered frame, a high grayscale conversion value of pixels located in an odd-numbered horizontal line region and a low-grayscale conversion value of pixels located in an even-numbered horizontal line region are calculated, and among the pixels of the even-numbered even-numbered frame, A gray level calculator for calculating a low gray scale conversion value of pixels located in an odd horizontal line area and a high gray scale conversion value of pixels located in an even horizontal line area; And The gray level of pixels in the odd-numbered horizontal line region among the assigned odd-numbered frames is shifted and converted to the calculated high gray scale conversion value, and the gray level of pixels in the even-numbered horizontal line region is converted to the calculated low gray scale conversion value. In addition to the transition, the gray level of pixels located in the odd-numbered horizontal line region among the assigned even-numbered frames is shifted and converted to the calculated low gray level conversion value, and the gray level of pixels positioned in the even-numbered horizontal line region is calculated. Gradation converter for shifting and converting up to high gradation conversion value Liquid crystal display comprising a. 11. The method of claim 10, The frequency converter, A storage unit for temporarily storing the input current frame; And A frequency conversion controller for temporarily storing the input current frame in the storage unit and continuously reading and outputting the frame of the storage unit within a predetermined time so that a first frame frequency is doubled to a second frame frequency Liquid crystal display comprising a. The method of claim 11, And the first frame frequency is 60 Hz, and the second frame frequency is 120 Hz. 11. The method of claim 10, And the gray value calculator classifies pixels of odd-numbered and even-numbered frames that are continuously input from the frequency converter within each horizontal line region. 11. The method of claim 10, The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered horizontal line regions among the pixels of the odd-numbered frame, and odd-numbered and even-numbered horizontal lines among the pixels of the even-numbered even frame. And a gray value of pixels located in an area. The method of claim 11, The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd-numbered horizontal line region among the pixels of the assigned odd-numbered frame and a predetermined reference gradation value. And a low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the even-numbered horizontal line region among the pixels of the frame and outputting the low gray scale conversion value to the gray scale converter. 16. The method of claim 15, The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd-numbered horizontal line region among the pixels of the even-numbered even-numbered frame, And a high gray level conversion value to be converted by adding the gray level value detected in the even-numbered horizontal line region among the pixels of the first frame and converting the predetermined reference gray value. . The method of claim 1, The frame processing means, A frequency converter for doubling the input frame frequency of the current frame and continuously outputting the assigned odd-numbered and even-numbered frames within a predetermined time period; Computing the high gray level conversion value of the pixels located in the odd subpixel area among the pixels of the odd odd frame and the low gray level conversion value of the pixels located in the even subpixel area, A gray scale value calculator for calculating a low gray scale conversion value of pixels located in odd-numbered subpixel areas and a high gray scale conversion value of pixels located in even-numbered subpixel areas; And Among the pixels of the odd-numbered frame, the gray level of pixels located in the odd-numbered sub-pixel region is shifted and converted to the calculated high gray scale conversion value, and the gray level of pixels located in the even-numbered sub-pixel area is converted to the calculated low gray scale conversion value. In addition to transition, the gray level of pixels located in the odd-numbered sub-pixel region among the assigned even-numbered frames is shifted to the calculated low gray-scale conversion value, and the gray level of pixels located in the even-numbered sub-pixel region is calculated. Gradation converter for shifting and converting up to high gradation conversion value Liquid crystal display comprising a. The method of claim 11, The frequency converter, A storage unit for temporarily storing the input current frame; And And a frequency conversion controller configured to temporarily store the input current frame in the storage unit, and continuously read out the frame of the storage unit within a predetermined time and output the first frame frequency at a second frame frequency. . The method of claim 18, And the first frame frequency is 60 Hz, and the second frame frequency is 120 Hz. The method of claim 17, And the gradation value calculator classifies pixels of odd-numbered and even-numbered frames that are continuously input from the frequency converter for each sub-pixel area. The method of claim 17, The gradation value calculator detects gradation values of pixels located in odd-numbered and even-numbered sub-pixel areas of the assigned odd-numbered frames, and odd-numbered and even-numbered sub-pixels among the pixels of the even-numbered even-numbered frame. And a gray value of pixels located in an area. 22. The method of claim 21, The gradation value calculator calculates a high gradation conversion value to be converted by adding a gradation value detected in an odd sub-pixel region among the pixels of the assigned odd frame and a predetermined reference gradation value, and then performs the assigned radix number. And a low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the even-numbered sub-pixel area among the pixels of the frame, and outputting the low gray scale conversion value to the gray scale converter. . 23. The method of claim 22, The gradation value calculator calculates a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the odd sub-pixel area among the pixels of the even-numbered even-numbered frame. And a high gray level conversion value to be converted by adding the gray level value detected in the even subpixel area among the pixels of the first frame and the predetermined reference gray level value, and outputting the converted gray level value to the gray level converter. . Multiplying the frame frequency of the input current frame to generate an odd-numbered frame and an even-numbered frame; Dividing the assigned odd-numbered and even-numbered pixels into constant regions; Convert the pixels located in the odd-numbered region of the assigned odd-numbered frame to the first grayscale, convert the pixels located in the even-numbered region to the second grayscale, and remove pixels located in the odd-numbered region of the assigned even-numbered frame. Converting to two gray levels and converting pixels located in even-numbered regions to first gray scale; And Driving the odd-numbered frame and the even-numbered frame having the converted gray level value to the liquid crystal display panel continuously within a predetermined time; Method of driving a liquid crystal display comprising a. 25. The method of claim 24, And the first gray level is a high gray level, and the second gray level is a low gray level. 25. The method of claim 24, And dividing pixels of the assigned odd-numbered frame and even-numbered frame for each vertical line region. 27. The method of claim 26, In the converting step, a high gray scale conversion value of pixels located in an odd-numbered vertical line region among the pixels of the assigned odd-numbered frame and a low gray scale conversion value of pixels located in an even-numbered vertical line region are calculated and the even-numbered even second A method of driving a liquid crystal display device, comprising: calculating low gray level conversion values of pixels located in an odd-numbered vertical line region among pixels of a frame and high gray level conversion values of pixels located in an even-numbered vertical line region. 28. The method of claim 27, The gray level of the pixels in the odd-numbered vertical line region among the assigned odd-numbered frames is shifted to the calculated high gray scale conversion value, and the gray level of the pixels in the even-numbered vertical line region is converted to the calculated low gray scale conversion value. Transition by converting and converting the gray level of pixels located in the odd-numbered vertical line region among the assigned even-numbered frames to the calculated low gray level conversion value, and calculating the gray level of pixels located in the even-numbered vertical line region. A method of driving a liquid crystal display device, characterized by shifting and converting to a high gray scale conversion value. 28. The method of claim 27, Detecting a gray value of pixels in odd-numbered and even-numbered vertical line regions among the assigned odd-numbered frames, and detecting pixels in odd-numbered and even-numbered vertical line regions among the even-numbered even-numbered frames. A method of driving a liquid crystal display device, characterized by detecting a gray scale value. 30. The method of claim 29, The grayscale value detected in the odd-numbered vertical line region among the assigned odd-numbered frames and a predetermined reference grayscale value are added to calculate a high-grayscale conversion value to be converted, and among the pixels of the assigned odd-numbered frame. And a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in an even-numbered vertical line region. 31. The method of claim 30, The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the odd-numbered vertical line region among the pixels of the even-numbered even frame is calculated, and the pixels of the even-numbered frame are assigned. And a high gradation conversion value to be converted by adding the gradation value detected in the even-numbered vertical line region and the predetermined reference gradation value. The method of claim 24, And dividing pixels of the assigned odd-numbered frame and even-numbered frame for each horizontal line region. 33. The method of claim 32, In the converting step, a high gray scale conversion value of pixels located in an odd-numbered horizontal line region among the pixels of the assigned odd-numbered frame and a low gray scale conversion value of pixels located in an even-numbered horizontal line region are calculated. A method of driving a liquid crystal display device, comprising: calculating low gray level conversion values of pixels located in an odd-numbered horizontal line region among pixels of a frame and high gray level conversion values of pixels located in an even-numbered horizontal line region. 34. The method of claim 33, The gray level of pixels in the odd-numbered horizontal line region among the assigned odd-numbered frames is shifted and converted to the calculated high gray scale conversion value, and the gray level of pixels in the even-numbered horizontal line region is converted to the calculated low gray scale conversion value. In addition to the transition, the gray level of pixels located in the odd-numbered horizontal line region among the assigned even-numbered frames is shifted and converted to the calculated low gray level conversion value, and the gray level of pixels positioned in the even-numbered horizontal line region is calculated. A method of driving a liquid crystal display device, characterized by shifting and converting to a high gray scale conversion value. 35. The method of claim 34, Detecting a gray value of pixels in odd-numbered and even-numbered horizontal line regions among the assigned odd-numbered frames, and detecting pixels in odd-numbered and even-numbered horizontal line regions among the even-numbered even-numbered frames. A method of driving a liquid crystal display device, characterized by detecting a gray scale value. 36. The method of claim 35, Among the pixels of the assigned odd frame, a grayscale value detected in an odd horizontal line region and a predetermined reference gray value are added to calculate a high gray scale conversion value to be converted, and among the pixels of the assigned odd frame. And a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in an even-numbered horizontal line region. 37. The method of claim 36, The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level detected in the odd-numbered horizontal line region among the pixels of the even-numbered even frame is calculated, and the pixels of the even-numbered frame are assigned. And a high gradation conversion value to be converted by adding the gradation value detected in the even-numbered horizontal line region and the predetermined reference gradation value. 25. The method of claim 24, And dividing pixels of the assigned odd-numbered frame and even-numbered frame for each sub-pixel region in the region division step. 39. The method of claim 38, In the converting step, a high gray scale conversion value of pixels located in an odd subpixel area among the pixels of the assigned odd frame and a low gray scale conversion value of pixels located in an even subpixel area are calculated, and the even-numbered even second A method of driving a liquid crystal display device, comprising: calculating low gray level conversion values of pixels located in odd-numbered subpixel areas and high gray level conversion values of pixels located in even-numbered subpixel areas among pixels of a frame. 40. The method of claim 39, Among the pixels of the odd-numbered frame, the gray level of pixels located in the odd-numbered sub-pixel region is shifted and converted to the calculated high gray scale conversion value, and the gray level of pixels located in the even-numbered sub-pixel area is converted to the calculated low gray scale conversion value. In addition to the transition, the gray level of pixels located in the odd-numbered sub-pixel region among the assigned even-numbered frames is shifted and converted to the calculated low gray-scale conversion value, and the gray level of pixels located in the even-numbered sub-pixel region is calculated. A method of driving a liquid crystal display device, characterized by shifting and converting to a high gray scale conversion value. 41. The method of claim 40, Detecting a gray value of pixels located in odd-numbered and even-numbered subpixel regions among the assigned odd-numbered frames, and detecting pixels in odd-numbered and even-numbered subpixel regions among the even-numbered even-numbered frames. A method of driving a liquid crystal display device, characterized by detecting a gray scale value. 42. The method of claim 41 wherein Among the pixels of the assigned odd frame, a grayscale value detected in an odd subpixel area and a predetermined reference gray value are added to calculate a high grayscale conversion value to be converted, and among the pixels of the assigned odd frame. And a low gradation conversion value to be converted by subtracting the predetermined reference gradation value from the gradation value detected in the even sub-pixel area. 43. The method of claim 42, The low gray scale conversion value to be converted by subtracting the predetermined reference gray value from the gray level value detected in the odd subpixel area among the pixels of the even-numbered even frame is calculated, and the pixels of the even-numbered frame are assigned. And a high gradation conversion value to be converted by adding the gradation value detected in an even-numbered sub-pixel area and the predetermined reference gradation value.

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