KR20160094513A - Display Panel for Display Device - Google Patents

Abstract

The present invention relates to a display panel for a display device. Inversion data opposite to driving data displayed on a previous frame for each pixel group or each pixel in a vertical blanking range is provide as a vertical blanking pattern data. Thereby, the data transition effect of all the pixels in the vertical blanking range is maximized. So, an afterimage removing effect in the total panel can be optimized.

Description

DISPLAY PANEL FOR DISPLAY DEVICE [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel for a display device, and more particularly to a display panel capable of improving a residual image problem by controlling a display operation in a vertical blanking (VB) interval.

 2. Description of the Related Art [0002] As an information-oriented society develops, there have been various demands for a display device for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) Various display devices such as an OLED (Organic Light Emitting Diode Display Device) are being utilized.

Among them, a liquid crystal display (LCD) displays an image by adjusting the light transmittance of liquid crystal using an electric field. To this end, a liquid crystal display device includes a liquid crystal display panel in which liquid crystal cells are arranged in a matrix form, and a driving circuit for driving the liquid crystal display panel.

The OLED display panel includes a plurality of thin film transistors, an array substrate having pixel regions controlled by the thin film transistors, and an organic light emitting layer disposed on the array substrate and emitting light according to the applied voltage.

On the other hand, a plurality of gate lines GL and data lines DL are intersected with an array substrate such as an LCD or an OLED display panel and a liquid crystal cell Clc is formed at an intersection of the gate line GL and the data line GL (Hereinafter referred to as " TFT ") for driving the pixel, and two corresponding electrodes (a pixel electrode or an anode and a common electrode or a cathode) are formed in each pixel, The transmissivity of the liquid crystal layer changes depending on the applied voltage or current, or the organic light emitting layer emits light, thereby performing the display operation.

On the other hand, in such a liquid crystal display (LCD), an organic light emitting display (OLED), or the like, pixels as minimum units constituting an image are provided side by side and each pixel is given a signal generated by image data, And a desired image is displayed on the resulting display area. That is, a specific data signal is applied to each pixel during one frame period, and the light is emitted with a constant luminance. A certain image is displayed in the entire display area.

A signal applied to a pixel is updated (refreshed) at a constant period. The time from when the signal is updated to the next time it is updated is referred to as one frame period. In the video display for the display area, By providing a pixel with a signal different from the previously given signal. On the other hand, in the hold type that can be used in the active matrix type display device, the pixel continues to emit light within one frame period. Particularly when a moving image is displayed, when a part of the image is moving, If it looks like a residual image, or if it is moving all over the image, the entire image will appear blurred (motion blur).

In order to solve such a problem, it is possible to provide black data or a gray level data to each pixel mainly between frames, thereby forming a blanking interval between images displayed between the front and back frames. The control method or section may be referred to as vertical blanking or vertical blanking.

As described above, in the vertical blanking interval between each frame of the display operation, all the pixels are provided as black data or a set of gray level data in a batch, and a large amount of residual image is left in each pixel depending on the display data of the previous frame. There is a problem that the degree of afterimage differs for each pixel, resulting in non-uniform image quality to be recognized.

Therefore, there is a need to optimize the data format or the display driving method provided to the pixels of the display area in the vertical blanking interval to maximally improve the afterimage problem between frames.

In view of the above, it is an object of the present invention to provide a display panel capable of minimizing the afterimage problem in which a residual image remains between every frame by optimizing the display operation in the vertical blanking interval in the display panel.

It is another object of the present invention to provide a display panel in which the afterimage problem between frames is improved by providing inverse data of the last driving data of the previous frame in the vertical blanking interval.

It is still another object of the present invention to provide a conventional uniform vertical blanking pattern by providing a data signal provided to each pixel in a vertical blanking interval between frames so as to be an inverted signal of driving data provided to a corresponding pixel in the immediately preceding frame A display panel with improved afterimage effect compared with the conventional display panel.

According to an aspect of the present invention, there is provided a liquid crystal display device including a panel unit including a plurality of pixels defined as intersecting regions of a gate line and a data line, A vertical blanking data generating unit for generating and outputting vertical blanking data that is inverted data and a data driver for receiving the vertical blanking data and applying a vertical blanking data output value to the data line of the panel unit during the vertical blanking interval, And a display panel including the display panel.

According to the embodiment of the present invention, the display operation in the vertical blanking interval is optimized in the display panel, thereby minimizing the afterimage problem in which the afterimage remains between each frame.

More specifically, the data signal provided to each pixel in the vertical blanking interval between both frames is an inverted signal of the driving data that was provided to the corresponding pixel in the immediately preceding frame, as compared with the conventional uniform vertical blanking pattern There is an effect that the afterimage problem can be solved.

1 is a functional block diagram of a display panel to which the present invention can be applied.
2 is a signal waveform diagram in a frame interval and a vertical blanking interval.
FIG. 3 shows a gradation change for each pixel in a manner of applying black data as a conventional vertical blanking pattern.
4 is a functional block diagram of a display panel including a vertical blanking data generator according to an embodiment of the present invention.
5 is a block diagram showing a detailed configuration of a vertical blanking data generating unit according to an embodiment of the present invention.
FIG. 6 illustrates a method of providing vertical blanking data according to an embodiment of the present invention, and shows data, display gradation, and waveform in a frame and a vertical blanking interval.
FIG. 7 illustrates frame data and vertical blanking patterns provided for each pixel when an embodiment of the present invention is applied.
FIG. 8 shows frame data and vertical blanking patterns for each pixel when another embodiment of the present invention is applied.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

1 is a functional block diagram of a display panel to which the present invention can be applied.

The display panel or display device to which the present invention can be applied mainly includes a panel unit 100 of a liquid crystal or OLED type, a source PCB 110, a gate driving circuit unit 120 and a system board unit 140, a module power unit 150, And the like.

The panel unit 100 includes a lower substrate as an array substrate, a color filter substrate, or an upper substrate as a protective substrate. The array substrate includes a plurality of data lines D1 to Dm and gate lines G1 to Gn And m 占 n (m, n is a positive integer) liquid crystal cells Clc are formed in the form of a matrix by the intersection structure thereof.

Each of the liquid crystal cells Clc includes a TFT, a pixel electrode connected to the TFT, and a storage capacitor Cst. The liquid crystal cell Clc is driven by the voltage difference between the pixel electrode for charging the data voltage through the TFT and the common electrode to which the common voltage Vcom is applied and adjusts the amount of incident light to adjust the transmission amount of the light corresponding to the image data DATA_RGB Thereby realizing a display image.

On the other hand, a black matrix, a color filter, and a common electrode are formed on the color filter substrate on the upper side of the array substrate. The common electrode is formed on the upper glass substrate in the vertical field driving method such as the TN mode and the VA mode, and is formed on the lower glass substrate together with the pixel electrode 1 in the horizontal electric field driving method such as the IPS mode and the FFS mode. On the upper glass substrate and the lower glass substrate of the liquid crystal display panel 16, an alignment film for attaching a polarizing plate and setting a pre-tilt angle of the liquid crystal is formed.

The display panel applicable to the present invention is not only a liquid crystal display panel of a vertical electric field system (TN mode, VA mode), a liquid crystal display panel of a horizontal electric field system (IPS mode, FFS mode), but also an OLED display panel, And includes a display frame for displaying data and all kinds of display panels and display devices in which a vertical blanking interval therebetween is defined and controlled.

That is, the present invention is not limited to a specific display panel or a type of display device to which the data providing method of the vertical blanking interval can be applied. For convenience, the liquid crystal display panel will be mainly described in the following description.

The gate driver 120 and the D-IC 118, which are data driving circuits, are included as a driving unit for inputting various control signals and data signals to the gate lines and the data lines formed in the panel unit 100 .

The source PCB 110 including the timing controller 112 and the EEPROM 114 may be connected to the panel unit 100 through a plurality of flexible circuit films such as TCP 116 And a D-IC 118, which is a data driver, may be mounted on each of the TCP films (TCPS). Such a plurality of D-ICs can constitute a data driving circuit for controlling the data lines of the entire panel.

The timing controller (T-con) 112 included in the source PCB 110 receives digital video data (DATA_RGB) input from an external device or a system board 140 of a set device (TV, mobile phone, etc.) ), And supplies them to the D-IC 118 in accordance with a mini-LVDS interface standard. The timing controller 112 receives a data control signal SDC for controlling the operation timing of the D-IC 118 using the timing signals Vsync, Hsync, DE, and DCLK input from the system board 140, A gate control signal GDC for controlling the operation timing of the gate driver 120, and the like.

The data control signal SDC includes a source start pulse SSP, a source sampling clock SSC, a source output enable SOE, a polarity control signal POL, . ≪ / RTI >

The gate control signal GDC includes at least one start pulse, at least two clock signals, a gate output enable signal GOE for controlling the gate output width, and the like.

In the case of a TFT liquid crystal display device using amorphous silicon as a material of a semiconductor layer, which is typically an active channel, the clock signal CLK is a pulse having an ON period width of four horizontal periods (H) and eight clock signals CLK1 to CLK8) can be used.

Here, the horizontal period or the horizontal period period represented by "H" can be defined as a reciprocal of a value obtained by multiplying the frame frequency by the number of gate lines. For example, if the display panel has a resolution of 1920 * 1080, the horizontal interval (H) period becomes 1 / (60Hz * 1080) 15.4 mu s.

The system board 140 is connected to a broadcast receiving circuit and an external video source interface circuit and supplies image data (DATA_RGB) input from the source circuit to a Low Voltage Differential Signaling (LVDS) interface or a Transition Minimized Differential Signaling To the timing controller 112. [ The system board 140 transmits a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a dot clock DCLK to the timing controller 112.

Each of the plurality of source drive ICs (D-ICs) 118 included in the data driving circuit receives the digital video data (DATA_RGB) input from the timing controller 112 in response to the data control signal SDC from the timing controller 112, And latches the data into data of a parallel data structure. Each of the D-ICs 118 converts the data converted into the parallel data transmission scheme into the analog gamma compensation voltage using the positive / negative polarity gamma reference voltages VGMAO1 to VGMAO10 from the module power supply unit 150, Polarity analog video data voltage to be charged to the positive polarity / negative polarity.

That is, each of the D-ICs 118 inverts the polarities of the positive / negative analog video data voltages under the control of the timing controller 112, and supplies the data voltages to the data lines D1 to Dm.

The gate driver 120 is formed directly on one side of the lower glass substrate of the liquid crystal panel unit 100 through a TFT array process according to a gate-in-panel (GIP) .

On the other hand, a vertical blanking interval, which is a kind of empty time interval between both frames, can be defined as a frame period in which data of a specific gradation is displayed in all pixels using such a display panel and a period in which both frames are distinguished.

2 is a signal waveform diagram in a frame interval and a vertical blanking interval.

As shown in FIG. 2, the ON period of the vertical synchronization signal (V _SYNC ) is a frame period for displaying an image on a pixel, and during a period longer than the OFF period of the vertical synchronization signal (V _SYNC ) Section.

More specifically, the vertical blanking interval may be defined as a time interval including a front porch interval and a back porch interval, which are an OFF interval of the vertical synchronization signal (V _SYNC ) and a predetermined time interval before and after the interval .

It is a principle that such a vertical blank interval does not display a specific image as a rest period between two frames.

However, although a specific image is not displayed on the pixel during such a vertical blank interval, it is common to apply a constant data voltage value in order to prevent floating of the data line.

At this time, in the vertical blanking period, the data signal of the gradation indicating the black data is commonly applied to all the data lines to all the pixels, so that the black data can be displayed in all the display regions in the vertical blanking period.

Of course, it is not always necessary to output black data in the vertical blanking interval, and a data signal of a constant gray level can be collectively provided to all the pixels.

According to some recently proposed techniques, a gray level to be applied to the vertical blanking interval may be a data average value of a part of the data lines of the preceding and following frames.

FIG. 3 shows a gradation change for each pixel in a manner of applying black data as a conventional vertical blanking pattern.

FIG. 3 shows the display gradation transition state of each pixel when black data is applied during the vertical blanking period. The left side shows the gradation (0 to 255) of the display data displayed in each pixel in the first frame, And black data (gradation: 0) is displayed in each pixel in one vertical blanking interval.

Hereinafter, the display panel includes m gate lines and n data lines so that a total of m x n pixels are defined. Pixels defined by the i-th gate line and the j-th data line are P _ij Let's express it.

In FIG. 3, it is assumed that the display panel has 256 gradations or levels of data that can be displayed by each pixel, and the gradation (level) 0 is full-black and the gradation - It is assumed to represent White (Full White).

As shown in FIG. 3, if m pixels corresponding to the first data line in the first frame, P ₁₁ , P ₂₁ , P ₃₁ , ... , And P _m1 are displayed in the first vertical blanking interval, it is assumed that black data having a gray level of 0 is applied to all the pixels in the first vertical blanking interval.

In the example of FIG. 3, in the case of the first pixel P ₁₁ , full-black data of level 0 is displayed in the first vertical blanking interval after the data of the gray level (level) 1 close to black in the first frame is displayed.

Thus, the pixel P _11, since substantially the same data and the gray level displayed in the first frame is to be displayed in the vertical blanking interval, leaving a lot of the residual image.

On the other hand, the pixel P ₃₁ is substantially near a gradation (level) in white after the 250 data is displayed, the pool of level 0 in the first vertical blanking interval in the first frame - not the black data is displayed, whereby the image after image of the displayed at the first frame remains do.

As described above, in the method of providing the black data or the constant gray level data in common for all the pixels during the vertical blanking interval, the degree of data transition varies depending on the type of data displayed in the previous frame for each pixel, There is a problem that the effect varies.

As a result, the afterimage-improving effect on the whole frame is deteriorated, or the image quality can be adversely affected due to the deviation of the degree of the afterimage-removing aftermixing.

In contrast, according to an embodiment of the present invention, inverted data obtained by inverting the active data displayed in the previous frame for each of at least one pixel is generated, and the inverted data is provided to the data line of the corresponding pixel during the vertical blanking interval, We propose a method to improve the afterimage improvement effect by the blanking interval.

Hereinafter, the detailed configuration of various embodiments of the present invention will be described in detail with reference to FIGS. 4 to 8. FIG.

4 is a functional block diagram of a display panel including a vertical blanking data generator according to an embodiment of the present invention.

4, a display panel according to an exemplary embodiment of the present invention includes a panel unit 400 including a plurality of pixels defined as intersecting regions of a gate line and a data line, A vertical blanking data generating unit 500 for generating vertical blanking data that is inverted data for active data and outputting the vertical blanking data, and a vertical blanking data generating unit 500 for receiving the vertical blanking data and outputting a vertical blanking data output value to a data line of the display panel during a vertical blanking interval. And a data driver 420 for applying the data.

In addition, after receiving a vertical synchronization signal (V _SYNC ), a horizontal synchronization signal (H _SYNC ), a clock (CLK) and a data signal from an external system board or the like, a gate control signal (GCS) A timing controller 430 for generating a data signal DATA and a data line control signal DCS and transmitting the generated data signal and data line control signal DCS to the data driver 420, And a common voltage generator 440 for generating a common voltage Vcom and applying the common voltage Vcom to the common electrode of the panel unit.

The panel unit 400 includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels formed by the plurality of gate lines and the data lines. As long as the display control of the vertical blanking method according to the embodiment of the present invention is performed, An organic light emitting display panel (OLED), and the like. However, for convenience, the liquid crystal display will be described as an example below.

In this specification, a display panel is a concept including not only a display panel as a meaning of the discussion but also a display device used in a display panel, and a set device such as a mobile phone or a TV as a final end product.

That is, the display panel defined in the present specification should be understood to include all types of display panels in which the inversion data of the driving data is displayed in the vertical blanking interval by the method of the present invention, and an upper apparatus or an apparatus including the same something to do.

In the panel unit 400, a liquid crystal is formed between two glass substrates, and a plurality of gate lines GL1 to GLm and a plurality of data lines DL1 to DLn cross each other on the lower glass substrate. That is, it is shown that m gate lines and n data lines are formed in the panel portion, and as a result, m x n pixels are formed.

A crossing region of a plurality of gate lines GL1 to GLm and a plurality of data lines DL1 to DLn is defined as one pixel or pixel and a thin film transistor TFT formed in each pixel responds to a scan signal from a gate line And supplies data from the data line to the liquid crystal cell Clc.

The gate electrode of the thin film transistor TFT is connected to the gate lines GL1 to GLm and the source electrode thereof is connected to the data lines DL1 to DLn and the drain electrode of the thin film transistor TFT is connected to the liquid crystal cell Clc).

A storage capacitor Cst for holding the voltage of the liquid crystal cell Clc is formed on the lower glass substrate of the panel unit 400. The storage capacitor Cst is connected between the liquid crystal cell Clc and the previous- Or may be formed between the liquid crystal cell Clc and a separate common line.

On the upper glass substrate of the panel unit 400, color filters of R, G, and B colors corresponding to the respective pixel regions where the TFTs are formed, and the gate lines GL1 to GLm, A black matrix for covering the data lines DL1 to DLn and the thin film transistors (TFT), and a common electrode for covering both of them.

The gate driver 410 correspondingly supplies a plurality of scan signals to the plurality of gate lines GL1 to GLm in response to a gate control signal GCS from the timing controller 430. [ The plurality of scan signals cause the plurality of gate lines GL1 to GLn to be enabled for a horizontal period H which is a pulse O period of one horizontal synchronizing signal H _SYNC sequentially. The gate driver 410 may include a plurality of gate driver integrated circuits.

The data driver 420 generates a plurality of pixel data voltages each time one of the plurality of gate lines GL1 to GLm is enabled in response to the data control signals DCS from the timing controller 430 To the plurality of data lines DL1 to DLn on the panel unit 400, respectively.

In addition, according to the embodiment of the present invention, the data driver 420 receives the vertical blanking data from the vertical blanking data generator 500 in addition to the above-described unique functions, and supplies vertical blanking data to the data lines of the display panel during the vertical blanking interval. And performs a function of applying a data output value.

The vertical blanking data generating unit and the inverted data, which is the vertical blanking data generated by the vertical blanking data generating unit, will be described in detail below with reference to FIG.

The timing controller 430 receives synchronization signals (Vsync, Hsync) supplied from an external system (for example, a graphics module of a computer system or an image demodulation module of a television receiving system, not shown) A gate control signal GCS for controlling the gate driver 410 and a data control signal DCS for controlling the data driver 420 are generated using the clock signal CLK and the clock signal CLK.

In addition, the timing controller 430 arranges the image data (DATA_RGB) input from the external system and supplies the aligned data to the data driver 420. [

The common voltage generator 440 generates a common voltage Vcom of a DC level using the power supply voltage Vdd supplied from a power supply unit (not shown) and supplies the generated common voltage Vcom to the common electrode of the panel unit 400 .

Meanwhile, the vertical blanking data generator 500, which is a main component of the present invention, generates vertical blanking data, which is inverted data of active data in a previous frame during a vertical blanking interval, and transmits the generated vertical blanking data to the data driver 420 Function.

5 is a block diagram showing a detailed configuration of a vertical blanking data generating unit according to an embodiment of the present invention.

The vertical blanking data generation unit 500 according to an embodiment of the present invention includes an inverting unit 510 for inverting drive data of a previous frame by one or more pixels on the basis of a data signal received from the timing controller, A frame buffer memory 520 for storing the inverted data for a predetermined time, and an output unit 530 for outputting the inverted data as vertical blanking data to the data driver during a vertical blanking interval.

In the following description, the frame buffer memory 520 and the output unit 530 are separately described. However, according to the implementation method, the frame buffer memory 520 and the output unit 530 may be represented or constituted as one component will be.

In this specification, the inverted data of the drive data of the previous frame, the expressions such as the vertical blanking data and the vertical blanking pattern are used in the same sense.

The inverted data, which is the vertical blanking data or the vertical blanking pattern, is inverted data (inverted data) inverted from the driving data or the active data displayed on the pixel immediately before the corresponding vertical blanking interval, and the reversal is the inverted data of the gradation, Or at least one of them is symmetrically or reversely formed.

For example, the inversion data for active data (drive data) having a level of 1 to N or a level of 2 when there is a gradation level is equal to N-1.

In addition, in the case of waveforms, the amplitude or intensity of the active data waveform is reversed, or in the case of the waveform of the pulse width modulation (pulse width modulation) method, the width PW of the pulse during a certain period is reversed do.

That is, if the amplitude of the waveform has 0 to 10 steps and the active data of the previous frame has 9 steps of amplitude, the inverse data thereof may be a waveform having an amplitude of one step. In the case of the pulse width modulation signal having the ON pulse width of the maximum period H, if the active data is a signal having the ON pulse width of 0.3H, the inverted data therefor may be a signal having the ON pulse width of 0.7H.

The inverting unit 510 of the vertical blanking data generating unit 500 receives driving data or active data, which are displayed for each pixel or for a certain group of pixels, during each frame, from the timing controller or the like, And transfers it to the output unit 530 or the frame buffer memory 520 as a storage unit.

Also, the inverting unit 510 generates inversion data for each frame, and may generate the inverted data on a pixel-by-pixel basis or a plurality of pixel-by-pixel group basis.

In other words, inversion data for all the pixels may be generated for each pixel and may be provided as vertical blanking data to the corresponding data line during the vertical blanking interval to display the inverted image. Alternatively, It is also possible to generate and provide pixel group inversion data for the pixel group.

The pixel group may include a plurality of pixels included in a certain region, or may include all pixels included in one or more gate lines or all pixels included in one or more data lines.

The reason for generating inversion data for each pixel group is that the vertical blanking interval is shorter than the frame interval so that individual scanning and data display for all the pixels may not be possible.

In other words, if the vertical blanking interval is equal to or longer than the time required for scanning all the pixels, it is preferable to generate and provide inversion data for each pixel. If the vertical blanking interval is shorter than that, Vertical blanking data can be displayed on a plurality of pixels at once by applying a batch scan signal to the corresponding pixels and applying vertical blanking data.

As an example of the inversion data for each pixel group, a vertical blanking pattern generated and provided for each data line is possible. The vertical blanking pattern for each data line is used for driving the driving data applied to the pixel included in the corresponding data line in the immediately preceding frame Or may be defined as the average value of the inversion values of the drive data applied to the pixels included in the data line.

One example of such inversion data for each pixel group will be described in more detail below with reference to FIG.

The frame buffer memory 520 of the vertical blanking data generator 500 temporarily stores the inverted data or the vertical blanking data generated by the inverting unit 510 for a predetermined period of time, And outputs the vertical blanking data to the data driver through the output unit 520.

That is, the driving data is applied to each pixel during one horizontal period (H) only in one frame period, and therefore, the inverted data of the driving data applied to each pixel is also generated only at the time when driving data is applied to the corresponding pixel.

The generated inverse data is used in the case where the operation of all the other pixels is completed and the vertical blanking interval is entered after the end of the corresponding frame period, so that the inverted data is stored in the frame buffer memory 520 during that time.

The frame buffer memory 520 outputs a picture signal to a raster display. The frame buffer memory 520 may be referred to as a refresh memory. In addition, the frame buffer memory 520 may store inverse data to be represented in a pixel during a vertical blanking interval, The vertical blanking data is stored for at least one screen amount or more and outputs inverse data or vertical blanking data stored in the memory as a bit stream in accordance with an external control signal.

The frame buffer memory 520 is not limited in its implementation and representation, and may be any type of storage means (not shown) as long as it stores inverse data or vertical blanking data for each pixel or each pixel group in accordance with an embodiment of the present invention. And the terms and expressions may also be otherwise defined with a frame buffer, a buffer memory, a frame synchronizer, or the like.

In addition, the vertical blanking data generation unit 500 according to the embodiment of the present invention may provide inverse data for every pixel or every pixel group for all the pixels, or only for some pixels during each vertical blanking interval There will be.

This is because the vertical blanking interval may not be long enough to display the inverted data in all the pixels, and the adjustment of the output of the inversion data to some or all of the pixels in this vertical blanking interval may be performed by register control of the timing controller .

For example, after all the pixels are divided into N regions, the inverted data for each pixel is output only to the pixels included in the first region during the first vertical blanking interval, and only the pixels included in the second region during the second vertical blanking interval A method of outputting inverted data for each pixel, or the like.

Alternatively, as described above, all the pixels are divided into M pixel groups, and the inversion data is generated for each pixel group, and the inversion data for each pixel group is displayed collectively on all the pixels in the corresponding pixel group during the vertical blanking interval Method.

In this case, the inversion data for each pixel group may be either inversion data for the average value of the driving data of the driving data applied to the pixels in the pixel group in the immediately preceding frame, or inverse data of the inverted values of the driving data applied to the pixels included in the pixel group .

Meanwhile, the vertical blanking data generating unit 500 may be implemented by a combination of hardware and software that constitute a general signal analyzer, and there is no limitation on the format of the hardware or software.

Although the vertical blanking data generator 500 is described separately from the data driver 420 in the above description, the vertical blanking data generator 500 may include a plurality of vertical blanking data generating units 500 in the data driver 420, the D-IC, the source PCB, It may be implemented as a module.

FIG. 6 illustrates a method of providing vertical blanking data according to an embodiment of the present invention, and shows data, display gradation, and waveform in a frame and a vertical blanking interval.

As shown in FIG. 6, the data supplied to the data lines of each pixel in the first frame (1 ^st Frame) period includes a plurality of driving data or active data, and the driving data is, when the panel is a hold-type active matrix type The driving data provided to each pixel in the horizontal period may be continuous data for one frame.

In other words, one section in the data of FIG. 6 may mean one horizontal period (H) in which the scanning signal and the data signal are applied to one pixel.

Meanwhile, in the embodiment of the present invention, the inverted data used in the vertical blanking data or the vertical blanking pattern is obtained by inverting the drive data provided at the last time point of the frame among the various drive data or active data applied to the corresponding pixel or the corresponding pixel group Lt; / RTI >

On the other hand, in the method of providing the inversion data in the vertical blanking interval, a method of providing / displaying the inversion data repeatedly and a method of providing and holding the inversion data one time after the first one can be applied.

That is, as shown in FIG. 6A, the inverted data (Inverted Data) obtained by inverting the last drive data (Active Data) of the previous frame is repeatedly displayed three times (three times in the drawing) in the first vertical blanking interval Alternatively, as shown in FIG. 6 (b), a method of holding until the corresponding vertical blanking interval is completed after the first-time display of the inversion data may be used.

On the other hand, if the gray level of the last driving data of the previous frame is 254 level close to white, as shown in the display gray level in FIG. 6A, the gray level of the level 1 Is displayed.

6A, if the amplitude of the waveform of the last drive data of the previous frame is a pulse nearly close to the maximum amplitude, the amplitude is almost zero as the inverse data for the vertical blanking interval A near low amplitude pulse may be provided.

Thus, the inverse data of grayscale / luminance / waveform opposite to the data displayed in the previous frame for each pixel or every pixel group in the vertical blanking interval is actively displayed, thereby improving afterimage on the entire panel.

FIG. 7 illustrates frame data and vertical blanking patterns provided for each pixel when an embodiment of the present invention is applied.

7 and 8, the pixel defined by the i-th gate line and the j-th data line is represented by P _ij , and it is assumed that the gradation or level of data that can be displayed by the pixel is 256 in total (Level) 0 is full-black, the gradation (level) 255 is full-white, and the drive data is a PWM waveform expressed by a pulse width during the horizontal period H.

In this case, if the first pixel P ₁₁ in the first frame (1 ^st Frame) as shown in Fig. 7 is provided with the drive data of the gradation 1 or the waveform having the 1/256 占 H ON period corresponding thereto, The inverted data of the pixel P ₁₁ generated through the inverting unit 510 of the vertical blanking data generating unit 500 by the horizontal blanking data generating unit 500 becomes the waveform having the ON period of 255/256 H or the data having the gradation 254.

As shown in FIG. 7, such inversion data is generated for every pixel, and is provided for each pixel in each vertical blanking interval and output.

Therefore, the inverse data opposite to the data displayed in the previous frame is displayed dynamically for each pixel in the vertical blanking interval, thereby maximizing the data transition effect of all the pixels in the vertical blanking interval, The effect can be optimized.

FIG. 8 shows frame data and vertical blanking patterns for each pixel when another embodiment of the present invention is applied.

The embodiment of FIG. 8 is an embodiment of generating / providing inverted data for each pixel group including two or more pixels, in which a pixel group is formed for each data line.

That is, inversion data is generated for each pixel group including m pixels corresponding to each data line, and the inverted data is collectively provided to all the pixels included in the pixel group in the vertical blanking interval and displayed.

The average value AV _P1 of the previous frame driving data of the m pixels (P ₁₁ , P ₂₁ , P ₃₁ , ..., P _ml ) included in the first data line DL1 is obtained, And generates VBP ₁ as data.

That is, the AV _P1 having the level 5 value is the driving data for the first pixel group, and VBP ₁ of the level 250 which is the inverse data thereof becomes the inverted data or the vertical blanking data for the first pixel group, VBP _1, which is inversion data for the first pixel group, is applied to all m pixels (P ₁₁ , P ₂₁ , P ₃₁ , ..., P _m1 ) included in the first pixel group.

The same applies to the n-th pixel group corresponding to the second to n-th data lines DLn corresponding to the second data line DL2.

Therefore, according to the embodiment of FIG. 8, the scanning signal is applied to all the pixels included in each pixel group during the vertical blanking interval, and then the inverted data for each pixel group is provided to the data line, The inversion data can be provided to all the pixels during the horizontal period).

That is, according to the embodiment in which the inversion data for each pixel group is generated as shown in Fig. 8, the afterimage improvement effect can be somewhat reduced as compared with the embodiment of Fig. 7 which provides the inversion data for each pixel in the vertical blanking pattern. It is possible to expect an afterimage improvement effect as compared with a method of collectively providing black data or a constant gray pattern, but it is also applicable to a case where the vertical blanking interval is very short.

As described above, according to the embodiment of the present invention, inverse data of grayscale / luminance / waveform opposite to the data displayed in the previous frame for each pixel or every pixel group in the vertical blanking interval is actively displayed, There will be an improvement effect.

According to another embodiment of the present invention, inverse data opposite to the data displayed in the previous frame for each pixel group in the vertical blanking interval is collectively provided to a plurality of corresponding pixels, so that even when the vertical blanking interval is very short In addition, the afterimage-improving effect can be expected compared with a conventional method of providing black data or a constant gray pattern at a time.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

400: panel part 410: gate driver
420: Data driver (D-IC) 430: Timing controller (T-con)
500: vertical blanking data generation unit 510:
520: frame buffer memory 530: output section

Claims (9)

A panel portion including a plurality of pixels defined as intersecting regions of a gate line and a data line;
A vertical blanking data generation unit for generating vertical blanking data, which is inverted data for driving data in a previous frame during a vertical blanking interval, and outputting the generated vertical blanking data;
A data driver receiving the vertical blanking data and applying a vertical blanking data output value to a data line of the panel unit during the vertical blanking interval;
. The method according to claim 1,
Wherein the inverted data is data obtained by inverting at least one of a gray level, a luminance and a waveform of the active data. The method according to claim 1,
Wherein the vertical blanking data is generated for each pixel and is inverted data of the last driving data applied to the pixel in the immediately preceding frame. The method according to claim 1,
Wherein the vertical blanking data generation unit comprises:
An inverting unit for inverting driving data of a previous frame by one or more pixels based on a data signal received from the timing controller to generate inverted data;
A frame buffer memory for storing the inverted data for a predetermined time;
. 5. The method of claim 4,
Wherein the vertical blanking data is generated for each pixel group including two or more pixels. 6. The method of claim 5,
Wherein the vertical blanking data is generated and provided for each data line and is inverse data for an average value of the driving data applied to m pixels included in the corresponding data line in the immediately preceding frame. The method according to claim 6,
Wherein at least one of a drive data average value and inverted data of the drive data applied to the pixel included in the corresponding data line is stored in the frame buffer memory. The method of claim 3,
Wherein the vertical blanking data generator repeatedly outputs the inverted data at least two times during the vertical blanking interval. The method of claim 3,
Wherein the vertical blanking data generation unit holds the inverted data for one time during the vertical blanking interval until the corresponding vertical blanking interval ends.

Images