KR100956420B1 - Signal process device for liquid display panel and liquid crystal display device including the same - Google Patents

Abstract

The signal processing apparatus and the liquid crystal display including the same generate intermediate image data by using previous image data and current image data, and convert the generated intermediate image data into replacement image data actually displayed on the liquid crystal display panel. The signal processing apparatus and the liquid crystal display including the same generate first and second compensated image data by compensating the substituted image data and the current image data through a DCC process. According to the signal processing device and the liquid crystal display including the same, the first compensation image data is generated based on the substitution image data. Therefore, as mentioned in the prior art, the first compensation image data is prevented from being overcompensated even though a normal DCC process is performed.

Description

SIGNAL PROCESS DEVICE FOR LIQUID DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME}

The present invention relates to a signal processing device for a liquid crystal display panel and a liquid crystal display device including the same, and more particularly, to a signal processing device for improving a response speed by applying a compensation voltage to a current frame and a liquid crystal display device including the same. will be.

In general, a liquid crystal display device is difficult to implement a video due to a slow response speed of the liquid crystal. In addition, since the LCD is a hold type display device, an edge of an object is not clear when a moving image is displayed, and a blurring phenomenon that blurs an image is caused.

Meanwhile, in order to improve the slow response speed of liquid crystals, a dynamic capacitance compensation (DCC) technique has been developed.

FIG. 1 is a diagram illustrating a voltage waveform of a data voltage applied to a liquid crystal to which a conventional DCC technique is applied and a luminance waveform generated from the liquid crystal, and FIG. 2 is a diagram for explaining a problem of the conventional DCC technique.

Referring to FIG. 1, the image data of the previous frame N-1 corresponds to the first target voltage V1, and the image data of the current frame N is higher than the first target voltage V1. Corresponds to the voltage V2. When the voltage difference between the first target voltage V1 and the second target voltage V2 is greater than a preset reference value, even if the second target voltage V2 is applied to the liquid crystal, due to the slow response speed of the liquid crystal, the current frame ( The desired target luminance L is not achieved within N). In Fig. 1, an example is shown in which the target luminance is reached after approximately two frames have elapsed (see A). In order to solve this problem, the DCC technology overdrives the second target voltage V2 to a compensation voltage Vc higher than the second target voltage V2. Therefore, the overdriven compensation voltage Vc is applied to the liquid crystal during the current frame N. As a result, the rising time is reduced, and the desired target luminance L can be achieved within one frame N (see B).

However, as shown in FIG. 2, in the state in which the luminance does not reach the first target luminance L1 corresponding to the first target voltage in the previous frame N-1, the second target in the current frame N is shown. When the compensation voltage Vc which overdrives the voltage V2 is applied, an excess luminance L3 exceeding the second target luminance L2 occurs in the current frame N. That is, although the normal DCC processing is performed, a result of applying excessive compensation voltage Vc in the current frame occurs. As a result, during the previous frame N-1 of a short time, if a data voltage causing a falling transition of gradation is applied to the corresponding pixel, and a compensation voltage to which the DCC technique is applied to the current frame N is applied to the corresponding pixel. As shown in FIG. 2, the excess luminance L3 is viewed from the corresponding pixel during the current frame N. FIG.

Accordingly, an object of the present invention is to provide a signal processing apparatus for a liquid crystal display panel which prevents blurring and prevents excessive compensation voltage from being applied in a current frame even though a normal DCC process is performed.

Another object of the present invention is to provide a liquid crystal display device having the signal processing device for the liquid crystal display panel.

In order to solve the above technical problem, the liquid crystal display panel signal processing apparatus according to the present invention includes a motion interpolation unit, a lookup table, a memory, and a data compensation unit. The motion interpolator calculates a motion vector by using previous image data of a previous frame and current image data of a current frame, and generates intermediate image data based on the motion vector. A plurality of reference grayscale values are prestored in the lookup table. The previous image data and the intermediate image data are applied to the lookup table. The look-up table replaces a target gray value of the intermediate image data with a first reference gray value actually displayed by the LCD panel by the intermediate image data, and replaces the substituted first reference gray value with first replacement image data. Output as. The memory receives and stores the current image data and the first replacement image data, and sequentially outputs the first replacement image data and the current image data during the current frame. The first compensation image data and the current image data are received by the data compensator. The data compensator generates first compensated image data by compensating the first replacement image data, and generates second compensated image data by compensating the current image data. The data compensator compensates for response characteristics of the liquid crystal display panel based on the generated first and second compensation image data.

In order to solve the other technical problems as described above, the liquid crystal display device of the present invention includes a signal processor, a data driver, a gate driver and a liquid crystal display panel. The signal processor receives the previous image data of the previous frame and the current image data of the current frame and sequentially outputs first and second compensation image data. The data driver generates and outputs a first compensation data voltage during a first subframe of the current frame in response to the first compensation image data, and generates a second subframe of the current frame in response to the second compensation image data. While generating and outputting a second compensation data voltage. The gate driver outputs a gate signal. The liquid crystal display panel includes a pixel that sequentially displays a first sub-image corresponding to the first compensation data voltage and a second sub-image corresponding to the second compensation data voltage in response to the gate signal during the current frame. do.

The signal processor includes a motion interpolator, a lookup table, a memory, and a data compensator.

 The motion interpolator calculates a motion vector by using previous image data of a previous frame and current image data of a current frame, and generates intermediate image data based on the motion vector. A plurality of reference grayscale values are prestored in the lookup table. The previous image data and the intermediate image data are applied to the lookup table. The look-up table replaces a target gray value of the intermediate image data with a first reference gray value actually displayed by the LCD panel by the intermediate image data, and replaces the substituted first reference gray value with first replacement image data. Output as. The memory receives and stores the current image data and the first replacement image data, and sequentially outputs the first replacement image data and the current image data during the current frame. The first compensation image data and the current image data are received by the data compensator. The data compensator generates first compensated image data by compensating the first replacement image data, and generates second compensated image data by compensating the current image data. The data compensator compensates for response characteristics of the liquid crystal display panel based on the compensated first and second compensated image data.

According to the liquid crystal display panel signal processing apparatus and the liquid crystal display apparatus including the same according to the present invention as described above, the blurring phenomenon of the liquid crystal display panel is prevented by the first sub-image inserted in the current frame.

In addition, the response speed of the liquid crystal display panel is improved by the first and second compensation image data DATA (n-0.5) and DATA (n) compensated through the DCC process.

In addition, since the first compensation image data is generated based on the first and second replacement image data actually displayed on the liquid crystal display panel, the first compensation image data is overcompensated despite the normal DCC process. prevent.

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

3 is a block diagram of a signal processing apparatus according to a first exemplary embodiment of the present invention, and FIG. 4 is an exemplary diagram illustrating a method of calculating a motion vector performed by the moving interpolator shown in FIG. 3.

Referring to FIG. 3, the signal processing apparatus 100 according to an exemplary embodiment may include a memory 110, a motion interpolator 120, first and second lookup tables 130A and 130B (LUT1 and LUT2), and It includes a data compensation unit 140.

Image data is sequentially applied to the memory 110 from an external device (eg, a graphic controller, etc.), and the applied image data is sequentially stored in units of frames. When image data (G (n): hereinafter, current image data) of the current frame is received in the memory 110, the previously stored image data (G (n-1): hereinafter, previous image data) of the previous frame is stored. It is output from the memory 110. The output previous image data G (n-1) is applied to the motion interpolator 120 and the first lookup table 130A.

The motion interpolator 120 receives the current image data G (n) from the external device and the previous image data G (n) from the memory 110. The motion interpolator 120 receives the current image data G (n) and the previous image data G (n) to generate intermediate image data G (n-0.5). The motion interpolator 120 calculates a motion vector using the current image data G (n) and the previous image data G (n) and based on the calculated motion vector. Intermediate image data G (n-0.5) is generated. The generated intermediate image data G (n-0.5) is inserted into the current frame.

Referring to FIG. 4, an image in which a quadrangular object moves from a lower left portion of the display screen to an upper right portion of the display screen is shown. In addition, X (n-1) shown in FIG. 4 represents the X axis coordinate value of the previous frame, and X (n) represents the coordinate value of the current frame. 4, Y (n-1) represents the Y-axis coordinate value of the previous frame, and Y (n) represents the Y-axis coordinate value of the current frame.

The horizontal motion vector HM is calculated from the difference between the X-axis coordinate value of the current frame and the X-axis coordinate value of the previous frame. The vertical motion vector VM is calculated from the difference between the Y-axis coordinate value of the current frame and the Y-axis coordinate value of the previous frame. The horizontal motion vector HM includes direction information on the X axis direction in which the image moves, and the vertical motion vector VM includes direction information on the Y axis direction in which the image moves. When the horizontal motion vector HM and the vertical motion vector VM are calculated, motion estimation of the object is performed using the calculated horizontal and vertical motion vectors HM and VM. The motion interpolator estimates a moving path of the image appearing on the display screen through the motion estimation, and generates new intermediate image data G (n-0.5) in which the image is located on the estimated moving path. do. As described above, the signal processing apparatus 100 according to the first embodiment of the present invention may cause a blurring phenomenon in which an image is blurred when displaying a video by the generated intermediate image data G (n-0.5). prevent.

Referring to FIG. 3 again, a plurality of first reference grayscale values are pre-stored in the first lookup table 130A (LUT1). The first lookup table 130A includes previous image data G (n-1) provided from the memory 110 and intermediate image data G (n-0.5) provided from the motion interpolation unit 120. Is applied as a read address. The first lookup table 130A includes a first reference image obtained by mapping a first reference gray value mapped by a combination of the previous image data G (n-1) and the intermediate image data G (n-0.5). It outputs as data TG (n-0.5). That is, the target gray value of the intermediate image data G (n-0.5) is replaced with the first reference gray value actually displayed by the liquid crystal display panel through the first lookup table 130A. In this case, the first reference gray values are measured in advance through an experiment. The measured first reference grayscale values are stored in the corresponding read address as reference data in the first lookup table 130A.

A plurality of second reference grayscale values are stored in the second lookup table 130B. The second lookup table 130B includes the current image data G (n-1) provided from the external device and the intermediate image data G (n-0.5) provided from the motion interpolator 120. It is applied as a read address. The second lookup table 130B converts a second reference gray value mapped by a combination of the current image data G (n) and the intermediate image data G (n-0.5) into second replacement image data ( Output as TG (n)). That is, the target grayscale value of the current image data G (n) is replaced with the second reference grayscale value actually displayed by the liquid crystal display panel through the second lookup table 130B.

The first and second replacement image data TG (n-0.5) and TG (n) output from the first and second lookup tables 130A and 130B are stored in the memory 110 again. The memory 110 sequentially outputs the first and second replacement image data TG (n-0.5) and TG (n) under the control of a memory controller (not shown) during the current frame.

Specifically, the current frame has first and second subframes that are contiguous in time. The holding time of the first subframe and the holding time of the second subframe may be the same or different from each other. In this embodiment, the holding time of the first subframe and the holding time of the second subframe are limited to the same. In this case, the memory 110 outputs the first replacement image data TG (n-0.5) during the first subframe, and the second replacement image data TG (n) during the second subframe. )

The data compensator 140 compensates for the first and second replacement image data TG (n-0.5) and TG (n) through the above-described DCC process. Specifically, the first replacement image data TG (n-0.5) is applied to the data compensator 140 during the first subframe, and the second replacement image data TG (n) during the second subframe. )) Is applied. The data compensator 140 compensates the first replacement image data TG (n-0.5) with the first compensation image data DATA (n-0.5) to output the first compensation image data during the first subframe. The second replacement image data TG (n) is compensated with the second compensation image data DATA (n) and output during the second subframe.

Accordingly, the liquid crystal display panel may display the first sub image corresponding to the first compensation image data DATA (n-0.5) and the second compensation image data DATA (n during the second sub frame during the first sub frame. A second sub image corresponding to)) is displayed.

Accordingly, the signal processing apparatus according to the first embodiment of the present invention prevents a blurring phenomenon of the liquid crystal display panel by the first sub-image inserted in the current frame.

In addition, the signal processing apparatus according to the first exemplary embodiment of the present invention uses the first and second compensation image data DATA (n-0.5) and DATA (n) compensated through the DCC process. Improve response speed

In addition, the first and second compensation image data DATA (n-0.5) and DATA (n) are generated based on the first and second replacement image data actually displayed on the liquid crystal display panel. Therefore, as mentioned in the related art, the first and second compensation image data DATA (n-0.5) and DATA (n) are prevented from being overcompensated even though a normal DCC process is performed.

5 is a block diagram of a signal processing apparatus according to a second embodiment of the present invention. However, the same reference numerals denote the same components as those shown in FIG. 3, and a detailed description thereof will be omitted.

Referring to FIG. 5, in the signal processing apparatus 100 according to the second embodiment of the present invention, unlike the first embodiment described above, the intermediate image data G (n-0.5) and the previous image data G (n Substitution is performed only for the combination of -1)). That is, in the second embodiment of the present invention, only the intermediate image data G (n-0.5) is replaced with the reference gray scale value actually displayed by the liquid crystal display panel. Therefore, in the second embodiment of the present invention, unlike the above-described first embodiment in which two lookup tables are required, only one lookup table is required. As a result, in the signal processing apparatus according to the second embodiment of the present invention, the total memory size of the lookup table is reduced.

In detail, the signal processing apparatus 100 according to the second embodiment of the present invention includes a memory 110, a motion interpolator 120, a first lookup table 130A, and a data compensator 140.

Image data is sequentially applied to the memory 110 from an external device (eg, a graphic controller, etc.), and the applied image data is sequentially stored in units of frames. When current image data G (n) is received in the memory 110, previously stored previous image data G (n−1) is output from the memory 100. The output previous image data G (n-1) is output to the motion interpolator 120. The output previous image data G (n-1) is applied to the motion interpolator 120 and the first lookup table 130A.

The motion interpolator 120 receives the current image data G (n) from the external device and the previous image data G (n-0.5) from the memory 110. The motion interpolator 120 receives the current image data G (n) and the previous image data G (n) to generate intermediate image data G (n-0.5).

A plurality of first reference grayscale values are pre-stored in the first lookup table 130A. The first lookup table 130A includes intermediate image data G (n-0.5) from the motion interpolator 120 and previous image data G (n-1) from the memory 110. It is applied as a read address. The first lookup table 130A includes a first reference image obtained by mapping a first reference gray value mapped by a combination of the previous image data G (n-1) and the intermediate image data G (n-0.5). It outputs as data TG (n-0.5).

The first replacement image data TG (n-0.5) output from the first lookup table 130A is stored in the memory 110 again.

Thereafter, the memory 110 controls the frame frequency of the stored first replacement image data TG (n-0.5) and the frame frequency of the current image data G (n) under the control of a memory controller (not shown). Convert it and print it out. That is, the memory 110 may include the first replacement image data TG (n-0.5) obtained by converting the frame frequencies of the first replacement image data TG (n-0.5) and the current image data G (n). ) And the current image data G (n) are sequentially output in the current frame.

The data compensator 140 sequentially receives the first replacement image data TG (n-0.5) and the current image data G (n) having the frame frequency converted in the current frame. The data compensator 140 compensates the first replacement image data TG (n-0.5) with the first compensation image data DATA (n-0.5) based on DCC technology, and the frame frequency is converted. The current image data G (n) is compensated with the second compensation image data DATA (n). The response speed of the liquid crystal display panel is improved by the compensated first and second compensation image data DATA (n-0.5) and DATA (n).

6 is a block diagram of a signal processing apparatus according to a third embodiment of the present invention. However, the same reference numerals denote the same components as those shown in FIG. 5, and a detailed description thereof will be omitted.

Referring to FIG. 6, the signal processing apparatus according to the third exemplary embodiment of the present invention includes only one third lookup table 130C as in the signal processing apparatus according to the second exemplary embodiment. However, in the third exemplary embodiment illustrated in FIG. 6, unlike the second exemplary embodiment illustrated in FIG. 5, the previous image data G (n-1) and the current image data may be included in one third lookup table 130C. Both G (n) and intermediate image data G (n-0.5) are applied. Accordingly, the third lookup table 130C corresponds to a first image corresponding to a combination of previous image data G (n-1) and intermediate image data G (n-0.5) provided from the motion interpolation unit 120. Second replacement image data TG (n) corresponding to the replacement image data TG (n-0.5) or the combination of the current image data G (n) and the intermediate image data G (n-0.5). And optionally outputs any one of the substituted image data of FIG. 6. In addition, in the third embodiment of FIG. 6, unlike the second embodiment of FIG. 5, the current image data G (n) is stored in the memory 110. FIG. ) And the intermediate image data G (n-0.5) are applied to the memory 110. Among the first and second replacement image data TG (n-0.5) and TG (n), Any one of the replacement image data is applied.

Thereafter, the memory 110 stores the first replacement image data TG (n-0.5) and the intermediate image data G (n−) during the first subframe of the current frame under the control of a memory controller (not shown). 0.5)) and outputs one of the image data, and the image of any one of the current image data G (n) and the second replacement image data TG (n) during the second subframe of the current frame. Output the data.

Specifically, the memory 110 outputs first replacement image data TG (n-0.5) during the first subframe of the current frame, and outputs the current image data G during the second subframe of the current frame. (n)) Alternatively, the memory 110 outputs the intermediate image data G (n-0.5) in the first subframe, and the second replacement image data TG (n) in the second subframe. Outputs

When the first replacement image data TG (n-0.5) and the current image data G (n) are sequentially applied to the data compensator 140 in the current frame, the data compensator 140 Compensating the first replacement image data TG (n-0.5) with the first compensation image data DATA (n-0.5) and outputting the first replacement image data TG (n-0.5) during the first subframe, and the current image data second compensation image data DATA (n)) to output during the second subframe.

On the other hand, when the intermediate image data G (n-0.5) and the second replacement image data TG (n) are sequentially applied to the data compensator 140, the data compensator 140 is configured to perform the operation. The intermediate image data G (n-0.5) is compensated with the first compensation image data DATA (n-0.5) and output during the first subframe, and the second replacement image data TG (n) is output. Compensated with second compensation image data DATA (n) and outputted during the second subframe.

7 is a block diagram of a signal processing apparatus according to a fourth embodiment of the present invention. However, the same reference numerals denote the same components as those shown in FIG. 6, and a detailed description thereof will be omitted.

Referring to FIG. 7, in the signal processing apparatus 100 according to the fourth exemplary embodiment, the output terminal and the input terminal of the memory are fed back by the fourth lookup table 130D.

In detail, the signal processing apparatus 100 according to the fourth embodiment of the present invention includes a memory 110, a motion interpolator 120, a fourth lookup table 130D, and a data compensator 140.

The memory 110 stores image data sequentially applied from an external device in units of frames. When current image data G (n) is applied to the memory 110, previous image data G (n-1) previously stored from the memory 110 is output. In addition, the intermediate image data G (n-0.5) generated from the motion interpolator 120 is applied to the memory 110.

The motion interpolator 120 receives the current image data G (n) and the previous image data G (n-1) from the memory 110 and the current image data G (n). ) And the previous image data G (n-1) to generate the intermediate image data G (n-0.5). The generated intermediate image data G (n-0.5) is stored in the memory 110.

The intermediate image data G (n-0.5) and the current image data G (n) stored in the memory 110 are applied to the fourth lookup table 130D. The fourth lookup table 130D may select the intermediate image data G (n-0.5) based on a combination of the intermediate image data G (n-0.5) and the current image data G (n). Converted to the first replacement image data TG (n-0.5). The converted first replacement image data TG (n-0.5) is applied to and stored in the memory 110.

The memory 110 outputs the first replacement image data TG (n-0.5) during the first subframe of the current frame, and outputs the current image data G (n) to the second subframe of the current frame. Output during the frame. The output first replacement image data TG (n-0.5) and the current image data G (n) are applied to the data compensator 140.

The data compensator 140 generates first compensation image data DATA (n-0.5) that compensates for the first replacement image data TG (n-0.5) through a DCC process, and generates the current image. Second compensation image data DATA (n) having been compensated for data G (n) is generated.

According to the signal processing apparatuses according to the first to fourth embodiments of the present invention described above, the first compensation image data DATA (n-0.5) is generated in the first subframe of the current frame. Therefore, blurring of the liquid crystal display panel is prevented by the first compensation image data DATA (n-0.5).

In addition, the response speed of the liquid crystal display panel is improved by the first and second compensation image data DATA (n-0.5) and DATA (n) compensated by the DCC process.

In addition, the first compensation image data DATA (n-0.5) is generated based on the first replacement image data TG (n-0.5) actually displayed on the liquid crystal display panel. Therefore, as mentioned in the related art, the first compensation image data DATA (n-0.5) is prevented from being overcompensated even though a normal DCC process is performed.

Meanwhile, the second, second, and fourth compensation image data DATA (n) may be prevented from being overcompensated through the first, third, and fourth embodiments described above.

8 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention. However, among the components illustrated in FIG. 8, the same reference numerals are denoted for the same components as those illustrated in FIGS. 3 to 7, and a detailed description thereof will be omitted.

Referring to FIG. 8, the liquid crystal display device 500 according to an exemplary embodiment of the present invention includes a liquid crystal display panel 200, a gate driver 300, a data driver 400, and a signal processor 100.

The liquid crystal display panel 200 includes a plurality of gate lines GL1 to GLn for receiving a gate voltage and a plurality of data lines DL1 to DLm for receiving a data voltage. A plurality of pixel regions are defined in the display unit 100 in a matrix form by the plurality of gate lines GL1 to GLn and the plurality of data lines DL1 to DLm. The pixel 210 is provided in each pixel area. The pixel 210 includes a thin film transistor TFT and a liquid crystal capacitor CLC.

The gate driver 300 is electrically connected to a plurality of gate lines GL1 to GLn of the liquid crystal display panel 200 to provide the gate voltages to the plurality of gate lines GL1 to GLn.

The data driver 400 is electrically connected to a plurality of data lines DL1 to DLm of the liquid crystal display panel 200, and first and second compensation data are connected to the plurality of data lines DL1 to DLm. Apply voltage.

The signal processor 100 receives image data Gn and various control signals O-CS from an external device (not shown). The signal processor 100 compensates the image data Gn and outputs first and second compensated image data DATA (n-0.5) and DATA (n).

In addition, the signal processor 100 receives the various control signals O-CS, for example, a vertical synchronous signal, a horizontal synchronous signal, a main clock, a data enable signal, and the like. , CT2) is printed.

The first control signal CT1 is provided to the gate driver 200 as a signal for controlling the operation of the gate driver 300. The first control signal CT1 may be a vertical start signal for starting the operation of the gate driver 300, a gate clock signal for determining an output timing of the gate voltage, and an output enable signal for determining an on pulse width of the gate voltage. And the like.

The gate driver 300 sequentially outputs the gate signals to the gate lines GL1 to GLn in response to the first control signal CT1 from the signal processor 100.

The second control signal CT2 is provided to the data driver 400 as a signal for controlling the operation of the data driver 400. The second control signal CT2 may be a horizontal start signal for starting the operation of the data driver 400, an inversion signal for inverting the polarity of the compensation data voltage, and the first and second data from the data driver 400. And an output instruction signal for determining when the voltage is output.

The data driver 400 may receive the first and second compensation image data DATA (n-0.5) and (DATA) corresponding to the pixel in response to the second control signal CT2 from the signal processor 100. (n)) is input sequentially.

The data driver 400 outputs the first compensation data voltage to the pixel 210 in response to the first compensation image data DATA (n-0.5) during the first subframe, and the second subframe. The second compensation data voltage is output to the pixel 210 in response to the second compensation image data DATA (n).

The pixel 210 displays a first sub-image corresponding to the first compensation data voltage during the first sub frame, and displays a second sub-image corresponding to the second compensation data voltage during the second sub frame. do.

As described above, in the LCD 500 according to the present invention, the first sub-image corresponding to the first compensation data voltage is inserted into the current frame. Therefore, the blurring phenomenon of the liquid crystal display panel 200 is prevented by the first sub image.

In addition, the response speed of the liquid crystal display panel 200 is improved by the first and second compensation data voltages compensated by the DCC process.

The first compensation data voltage is generated based on the first replacement image data TG (n-0.5) that is actually displayed on the liquid crystal display panel. Therefore, as mentioned in the prior art, the first compensation data voltage is prevented from being overcompensated even though a normal DCC process is performed.

Meanwhile, a liquid crystal display device in which the signal processing device according to the second embodiment is applied to FIG. 8 is disclosed. Therefore, the signal processor shown in FIG. 8 and the signal processor according to the second embodiment of the present disclosure perform the same components and the same functions. However, the present invention is not limited thereto, and the signal processing apparatuses according to the first, third, and fourth embodiments may be applied to the liquid crystal display.

Although described with reference to the embodiments, it will be understood by those skilled in the art that the present invention may be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

1 and 2 are diagrams for explaining a conventional DCC technology.

3 is a block diagram of a signal processing apparatus according to a first embodiment of the present invention.

FIG. 4 is an exemplary diagram illustrating a method of calculating a motion vector performed in the motion interpolation unit illustrated in FIG. 3.

5 is a block diagram of a signal processing apparatus according to a second embodiment of the present invention.

6 is a block diagram of a signal processing apparatus according to a third embodiment of the present invention.

7 is a block diagram of a signal processing apparatus according to a fourth embodiment of the present invention.

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

Claims (20)

In the signal processing device for a liquid crystal display panel, A motion interpolation unit configured to calculate a motion vector by using previous image data of a previous frame and current image data of a current frame, and generate intermediate image data based on the motion vector; A first reference in which a plurality of reference grayscale values are previously stored, and the liquid crystal display panel actually displays the target grayscale value of the intermediate image data based on the combination of the previous image data and the intermediate image data by the intermediate image data; A lookup table for substituting the gray scale value and outputting the substituted first reference gray scale value as first substituted image data; A memory configured to receive and store the current image data and the first replacement image data, and sequentially output the first replacement image data and the current image data during the current frame; And Receiving the first replacement image data and the current image data from the memory, compensating the first replacement image data to generate first compensation image data, and compensating the current image data to generate second compensation image data And a data compensator configured to compensate for response characteristics of the liquid crystal display panel based on the generated first and second compensation image data. The method of claim 1, wherein the current frame consists of first and second subframes that are continuous in time. And the memory outputs the first replacement image data during the first sub frame, and outputs the current image data during the second sub frame. 3. The liquid crystal display panel signal processing device according to claim 2, wherein the holding time of the first subframe and the holding time of the second subframe are the same. 3. The liquid crystal display panel signal processing device according to claim 2, wherein the holding time of the first subframe and the holding time of the second subframe are different from each other. The display apparatus of claim 2, wherein the lookup table receives the current image data; Based on a combination of the current image data and the intermediate image data, the gray value of the current image data is replaced with a second reference gray value, and the substituted second reference gray value is output as second substituted image data. A signal processing device for a liquid crystal display panel. 6. The signal processing apparatus for a liquid crystal display panel according to claim 5, wherein the second reference gray value is a gray value actually displayed from the liquid crystal display panel based on the current image data. 6. The memory of claim 5, wherein the memory receives and stores the second replacement image data and the intermediate image data, outputs the stored intermediate image data during the first subframe, and stores the stored second image data during the second subframe. A signal processing device for a liquid crystal display panel, characterized by outputting two-substituted image data. The display apparatus of claim 7, wherein the data compensator receives the intermediate image data and the second substituted image data from the memory, compensates the intermediate image data to generate first compensated image data, and generates the second substituted image data. And compensating for the second compensation image data to generate second compensation image data, and compensating for the response characteristic of the liquid crystal display panel based on the generated first and second compensation image data. A motion interpolation unit configured to calculate a motion vector by using previous image data of a previous frame and current image data of a current frame, and generate intermediate image data based on the motion vector; A plurality of first reference grayscale values are pre-stored, the previous image data and the intermediate image data are input, and one of the plurality of first reference grayscale values is based on the previous image data and the intermediate image data. A first lookup table for outputting the replacement image data; A plurality of second reference grayscale values are pre-stored, the current image data and the intermediate image data are received, and one of the plurality of second reference grayscale values is based on the current image data and the intermediate image data. A second lookup table output as the replacement image data; A memory configured to receive and store the first and second substitute image data, and sequentially output the first and second substitute image data during the current frame; And Data compensation for receiving the first and second substitution image data, compensating the first substitution image data to generate first compensation image data, and compensating the second substitution image data to generate second compensation image data. A signal processing device for a liquid crystal display panel comprising a portion. 10. The method of claim 9, wherein the current frame consists of first and second subframes that are continuous in time. And the memory outputs the first replacement image data during the first subframe and the second replacement image data during the second subframe. A signal processor which sequentially receives first image data of the previous frame and current image data of the current frame and sequentially outputs first and second compensation image data; Generate and output a first compensation data voltage during a first subframe of the current frame in response to the first compensation image data, and generate a second compensation during a second subframe of the current frame in response to the second compensation image data. A data driver for generating and outputting a data voltage; A gate driver for outputting a gate signal; And A liquid crystal display panel including pixels sequentially displaying a first sub-image corresponding to the first compensation data voltage and a second sub-image corresponding to the second compensation data voltage in response to the gate signal during the current frame; Including, The signal processing unit, A motion interpolation unit configured to calculate a motion vector by using previous image data of a previous frame and current image data of a current frame, and generate intermediate image data based on the motion vector; A plurality of reference grayscale values are pre-stored, the first reference grayscale for receiving the previous image data and the intermediate image data, and actually displaying the target grayscale value of the intermediate image data by the intermediate image data. A lookup table that substitutes a value and outputs the substituted first reference gray value as first substituted image data; A memory configured to receive and store the current image data and the first replacement image data, and sequentially output the first replacement image data and the current image data during the current frame; And The first replacement image data and the current image data are received from the memory, the first replacement image data is compensated to generate the first compensation image data, and the second compensation image data is compensated for. And a data compensator configured to compensate for a response characteristic of the liquid crystal display panel based on the generated first and second compensation image data. 12. The apparatus of claim 11, wherein the current frame comprises first and second subframes that are continuous in time. And the memory outputs the first replacement image data during the first subframe and the current image data during the second subframe. The liquid crystal display of claim 12, wherein the holding time of the first subframe and the holding time of the second subframe are the same. The liquid crystal display of claim 12, wherein the holding time of the first subframe and the holding time of the second subframe are different from each other. The display apparatus of claim 11, wherein the lookup table receives the current image data, replaces a gray value of the current image data with a second reference gray value based on a combination of the current image data and the intermediate image data. And a second reference tone value substituted as second replacement image data.  16. The liquid crystal display device according to claim 15, wherein the second reference gray value is a gray value actually displayed from the liquid crystal display panel based on the current image data. The method of claim 15, wherein the memory receives and stores the second replacement image data and the intermediate image data, outputs the intermediate image data during the first subframe, and the second replacement during the second subframe. A liquid crystal display device for outputting image data. The display apparatus of claim 17, wherein the data compensator receives the intermediate image data and the second substituted image data from the memory, compensates the intermediate image data, generates first compensated image data, and generates the second substituted image data. And compensating for the second compensation image data, and compensating for the response characteristic of the liquid crystal display panel based on the generated first and second compensation image data. 12. The liquid crystal display panel of claim 11, wherein the liquid crystal display panel includes a plurality of gate lines receiving the gate signal and a plurality of data lines crossing the plurality of gate lines and receiving the first and second compensation data voltages. , And the pixel is electrically connected to a corresponding gate line of the plurality of gate lines and a corresponding data line of the plurality of data lines. The method of claim 19, The pixel, A thin film transistor electrically connected to the corresponding data line and the corresponding gate line; And And a liquid crystal capacitor configured to receive the first and second compensation data voltages according to an on operation of the thin film transistor.

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