TWI413070B - Driving device and method of a display device - Google Patents

Abstract

The invention provides a driving device and method for a display device to reduce power consumption. Gate driver 5 and source driver 7 perform row inversion driving or dot inversion driving on the display device 1 using a chase scan scheme, in which a plurality of sub frames constituting a frame sequentially start to be scanned every predetermined interval. The driving device comprises a control device for controlling gate driver 5 and source driver 7. A total scan period of a frame including vertical blanking signals is equal to an odd number of the scan line periods. The number of sub frames is odd. The interval of the chase scan is equal to an odd number of the scan line periods. In a plurality of sub frames constituting a frame, the polarities of pixels in every sub frames are inverted.

Description

Driving device and driving method of display device

The present invention relates to a liquid crystal display device, and more particularly to a driving device and a driving method for a display device, which performs tracking scanning for purposes such as over drive.

In a conventional display device such as a liquid crystal display or the like, a plurality of gate lines and a plurality of source bus bars are alternately arranged, and pixels are provided at each of the interlaced points, and a matrix-shaped display region is formed by a plurality of pixels. . The display device is driven by a gate drive circuit and a source drive circuit. The gate drive circuit sequentially drives a plurality of gate lines. When driving each gate line, the source driving circuit also drives a plurality of source bus bars, and supplies a source bus bar voltage corresponding to the image to be displayed to each source bus bar. Thereby, the image can be displayed on the display area.

In the past, based on the consideration of the service life, the reverse driving technique was employed in the display device. A variety of different inversion driving techniques are known, and the present invention is primarily related to row inversion driving and dot inversion driving. In the column inversion driving, the polarity of the pixel voltage between each gate line is reversed. In the dot inversion driving, the polarity between each gate line and each source bus line is reversed. Transfer relationship.

However, a so-called over drive technique has been developed which can be used to increase the response speed of a display device. Overdrive technology For each pixel, an overdrive voltage is provided in advance to its source bus, and then the final drive voltage is provided. The final driving voltage is a signal corresponding to the image to be displayed, and may also be referred to as a target voltage. The overdrive voltage is set to be greater than a predetermined value of the final drive voltage.

The above example can be considered as an overdrive technology that includes two stages of overdrive voltage and final drive voltage. In other examples, a three-stage overdrive technique can also be used. At this time, a pre-drive (pre-drive) voltage, an overdrive voltage (OD), and a final drive (last drive) voltage are sequentially provided. The pre-drive voltage is set to be less than the overdrive voltage.

In other examples of overdrive technology, the pre-drive voltage and overdrive voltage described above are sequentially provided. The pre-drive voltage is set to a predetermined value smaller than the overdrive voltage. At this time, the overdrive voltage is controlled and provided in such a manner that the required write voltage can be achieved during the write period. Thereby, the voltage of each pixel is the value corresponding to the image to be displayed. This technique can also be referred to as a two-stage overdrive technique.

In order to implement overdrive technology, it is necessary to perform multiple scans of each pixel during a frame. For this scanning method, sequential-scan and chase-scan can be considered.

Sequential scanning is the next scan of the entire screen after each scan is completed for the entire screen. In the case of the three-stage, after the scanning of the pre-drive voltage is completed, the scan of the overdrive voltage is started; after the scan of the overdrive voltage is completed, the scan of the final drive voltage is started.

On the other hand, the tracking scan starts the next scan on the way of each scan (before the scan is completed at the lowest position on the screen). In the case of three stages, the scan of the overdrive voltage is started on the way of the pre-drive voltage scan, that is, after a predetermined time interval has elapsed. This time interval is equivalent to the interval of the number of predetermined scan lines. In addition, the scanning of the final driving voltage is started by delaying the predetermined time interval after the overdrive voltage scanning.

Tracking scan is a technique that can scan at intervals of offset settings for multiple frame data. In the following description, the plural frames in the tracking scan are referred to as sub-frames, respectively. In the case of three-stage overdrive technology, three sub-frames of pre-drive, overdrive and final drive are used.

With this tracking scan, the degree of freedom of the drive interval can be increased. However, in the conventional display device using column inversion driving or dot inversion driving, when the tracking scanning scheme is used, as in the following example, the polarity inversion of the source bus bar is increased, and power consumption is increased. Will also increase.

Figure 1 shows a schematic diagram of an example of a three-stage overdrive technique. In Fig. 1, the gate drive timing, the source bus voltage waveform, and the source bus polarity change with time are sequentially indicated. In Fig. 1, a line cycle time or a line period indicates a period of scanning line driving. Each scanning line period is a time for driving one gate line GL.

As shown in Fig. 1, the tracking scan is a gate scan that performs pre-drive, overdrive, and final drive. In the example of the schema, the time interval between pre-drive and overdrive is 3 scan lines, which is equivalent to 3 The spacing of the scan lines. Similarly, the time interval between overdrive and final drive is also the interval of three scan lines. Further, as shown, the pre-drive, overdrive, and final drive are performed during the first 1/3 period, the middle 1/3 period, and the last 1/3 of each scan line period, respectively.

In the case of the above-described tracking scan, as shown in the figure, the polarity of the source bus bar voltage frequently changes. Specifically, there will be three polarity inversions during each scan line. For example, the polarity change in the scan line period 1 is +, -, +, and the polarity change in the scan line period 2 is -, +, -.

Such frequent polarity inversion is due to the combination of column inversion driving or dot inversion driving and tracking scanning. Referring to the polarity change below the first figure, in the column inversion driving or the dot inversion driving, the polarity of the pre-drive is reversed during each scanning line period. Similarly, the polarity of overdrive is also reversed during each scan line. In addition, the polarity of the final drive is also reversed during each scan line period. The polarity change of the overdrive is different from the polarity change of the other two. The result of such a combination, as shown, has three polarity inversions during each scan line period.

Such frequent polarity reversal will eventually lead to an increase in power consumption. Therefore, in the case where the tracking scan is performed in the display device of the column inversion driving or the dot inversion driving, it is necessary to be able to reduce the power consumption as much as possible.

In the above description, the background of the present invention has been described in terms of the use of tracking scanning in the overdrive technique. However, the same situation occurs when a tracking scan is performed without using overdrive technology. Other examples of tracking scans are used, such as black frame insertion. Insert In black technology, when the target voltage is written, the black level voltage is written to the pixels to improve the animation response.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-162256.

Based on the above background, an object of the present invention is to provide a driving device and a driving method for a display device, which can reduce power consumption.

In addition, another object of the present invention is to provide a driving device and a driving method for a display device to obtain a higher quality image.

An embodiment of the present invention is a driving device for a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving a plurality of gate lines of the display device, wherein And the gate driver performs a column inversion driving or a dot inversion driving on the display device together with the source driver, and performs a tracking scan to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; a control device for controlling the gate driver and the source driver, wherein a full scan period of a vertical blanking signal in one picture is equal to an odd number of scan lines, and the number of the sub-frames is an odd number, and the tracking scan The time interval is equal to an odd number of scan lines, and the polarity of each pixel between the sub-frames is inverted between the plurality of sub-frames constituting a picture frame and sequentially written.

In the present invention, the plurality of source bus signals are sequentially supplied to the respective source bus bars during one scanning line period. The complex source scan line signals are respectively supplied to the complex number offset by the tracking scan time interval. Scan line (plural pixel). Therefore, in the present invention, since the above-described structure is employed, the voltages of the plurality of source bus bar signals are the same during one scanning line. For example, when the present invention is applied to a three-stage overdrive technique, during a scan line, pre-drive, overdrive, and final drive are performed on the scan lines with an offset of one time interval at a time. At this time, the voltages of the three drivers are the same during one scan line. Thereby, in the present invention, the number of times of inversion of the source bus bar voltage is lowered, and power consumption can be reduced.

Another embodiment of the present invention is a driving device for a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving the plurality of gate lines of the display device And the gate driver and the source driver jointly perform column inversion driving or dot inversion driving on the display device, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval. And a control device for controlling the gate driver and the source driver, wherein a vertical scanning period of a vertical blanking signal is equal to an odd number of scanning lines, and the number of the sub-frames is an odd number, and the tracking scan is performed. The above time interval is equal to an even number of scanning line periods, and the polarity of each pixel between the plurality of sub-frames constituting a picture frame and sequentially written is not inverted between each sub-frame.

Another embodiment of the present invention is a driving device for a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving the plurality of gate lines of the display device Wherein the above gate driver is in common with the source driver Performing column inversion driving or dot inversion driving on the display device, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling means for controlling the gate driver And the source driver, wherein a full scan period of the vertical blanking signal in one picture is equal to an odd number of scan lines, the number of the sub-picture frames is an even number, and the time interval of the tracking scan is equal to an odd or even number of scan lines And the polarity of each pixel between the plurality of sub-frames constituting a picture frame and being sequentially written is not inverted between each sub-frame.

Another embodiment of the present invention is a driving device for a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving the plurality of gate lines of the display device And the gate driver and the source driver jointly perform column inversion driving or dot inversion driving on the display device, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval. And a control device for controlling the gate driver and the source driver, wherein a vertical scan period of the vertical blanking signal is equal to an odd number of scan lines, and the number of the sub-frames is an even number, the tracking scan The time interval is equal to an odd or even number of scan lines, and the polarity of each pixel between the plurality of sub-frames constituting a picture frame and sequentially written is reversed between each sub-frame, and in a picture The polarity of each pixel between the sub-frame that was last written to the frame and the sub-frame that was originally written by the next frame is not reversed.

Another embodiment of the present invention is a driving method of a display device, The method includes: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the column inversion driving or the dot inversion is performed on the display device by driving the gate lines and the source bus bar Rotating the drive, and performing a tracking scan to scan a plurality of sub-frames constituting a picture frame in a manner offset by a predetermined time interval; and controlling driving of the display device, wherein a full scan period including a vertical blanking signal in one picture is equal to an odd number During the scan lines, the number of the sub-frames is an odd number, and the time interval of the tracking scan is equal to an odd number of scan lines, and each pixel between the plurality of sub-frames constituting a picture frame and sequentially written. The polarity is reversed between each sub-frame.

Another embodiment of the present invention is a driving method of a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The pole bus bar performs a column inversion driving or a dot inversion driving on the display device, and performs a tracking scan to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling driving of the display device, In a picture in which a vertical scanning period is equal to an odd number of scanning lines, the number of the sub-frames is an odd number, and the time interval of the tracking scan is equal to an even number of scanning lines, and a frame is formed. The polarity of each pixel between the plurality of sub-frames that are sequentially written is not inverted between each sub-frame.

Another embodiment of the present invention is a driving method of a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line is driven by The source bus bar performs column inversion driving or dot inversion driving on the display device, and performs tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling the display device Driving, wherein a full scan period including a vertical blanking signal in one picture is equal to an odd number of scan lines, the number of the sub-picture frames is an even number, and the time interval of the tracking scan is equal to an odd or even number of scan lines, and is configured The polarity of each pixel between a plurality of frames and a plurality of sub-frames that are sequentially written is not inverted between each sub-frame.

Another embodiment of the present invention is a driving method of a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The pole bus bar performs a column inversion driving or a dot inversion driving on the display device, and performs a tracking scan to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling driving of the display device, In a picture in which a vertical scanning period is equal to an odd number of scanning lines, the number of the sub-picture frames is an even number, and the time interval of the tracking scan is equal to an odd or even number of scanning lines, forming a picture frame. And the polarity of each pixel between the plurality of sub-frames sequentially written is reversed between each sub-frame, and the sub-frames written at the end of one frame and the sub-frames originally written by the next frame The polarity of each pixel is not reversed.

In addition, another embodiment of the present invention may be an electronic device having a display device including the above-mentioned driving device, wherein the electronic device is a mobile phone, a personal digital assistant, a notebook computer, and a car. Any of a navigation device, a television, a digital camera, and a liquid crystal display device.

According to the present invention, in the case where the column inversion driving type or the dot inversion driving type display device performs tracking scanning, power consumption can be reduced.

The following is a detailed description of the invention. However, the following detailed description and the accompanying drawings are not intended to limit the invention. On the other hand, the scope of the invention should be determined by the scope of the appended claims.

First embodiment

Fig. 2 is a view showing the structure of the display device of this embodiment. In the present embodiment, the display device 1 is a liquid crystal display. The display device 1 includes a display unit 3, a gate drive circuit 5, a source drive circuit 7, and a control circuit 9. The driving circuit of the present invention is included in the display device 1, and in other words, is composed of a gate driving circuit 5, a source driving circuit 7, and a control circuit 9.

The display section 3 has a plurality of gate lines GL and a plurality of source bus bars SB that are staggered with each other. A pixel is formed on each of the interlaced points of the plurality of gate lines GL and the plurality of source sinks SB, and the plurality of pixels are arranged in a matrix to form a display region. A transistor is formed at each pixel position, and the gate electrode and the source electrode of the transistor are connected to the gate line GL and the source bus bar SB, respectively.

The gate driving circuit 5 is a circuit for sequentially driving a plurality of gate lines GL. The source driving circuit 7 is provided corresponding to the image to be displayed. The circuit that drives the source busbars by the source busbar voltage. The control circuit 9 controls the gate drive circuit 5 and the source drive circuit 7 based on the image data supplied from the CPU (Central Processing Unit) 11, and displays the image on the display unit 3.

In the above configuration, when the gate driving circuit 5 supplies the pulse wave signal to drive one gate line GL, the transistors of the respective pixels on the gate line GL are turned on. Next, the source driver circuit 7 supplies the source busbar voltage to each of the turned-on pixels through the source busbars. This action is performed on the plurality of gate lines GL in sequence by the gate drive circuit 5 and the source drive circuit 7 under the control of the control circuit 9. Thereby, the image is displayed on the display unit 3.

In the present embodiment, the driving device of the display device 1 is configured to perform column inversion driving or dot inversion driving. The operation of the inversion drive is performed by the gate drive circuit 5 and the source drive circuit 7 under the control of the control circuit 9. Referring to FIG. 3, in the column inversion driving, the polarity of the source bus bar voltage is inversely related for each adjacent gate line GL (ie, each column). In addition, in the dot inversion driving, the polarity of the source bus bar voltage is reversed for each adjacent gate line GL (each column) and each adjacent source bus bar SB (each row). relationship. Regardless of the column inversion drive and the dot inversion drive, in terms of one source bus bar SB, for each adjacent gate line GL (ie, each adjacent pixel), its source bus bar voltage The polarity is inversely related.

In addition, in the following detailed description, the display device 1 of the present embodiment and its driving device are methods for performing three-stage overdrive by using tracking scanning. Composition. The operation related to the tracking is performed by the gate driving circuit 5 and the source driving circuit 7 under the control of the control circuit 9.

In the three-stage overdrive technology, each pixel is sequentially driven by a pre-drive voltage, an overdrive voltage, and a final drive voltage. The final driving voltage is a signal corresponding to the image to be displayed, and may also be referred to as a target voltage. The overdrive voltage is set to be greater than the predetermined value of the final drive voltage. The pre-drive voltage is set to be less than the overdrive voltage.

In the above overdrive technique, each pixel in a picture requires three drives. In this embodiment, the plurality of times of driving is implemented by means of tracking scanning. Tracking scan means that the next scan is started on the way of each scan. In other words, the scan of the pre-drive voltage is first performed, and after the predetermined time interval is delayed from the start of the pre-drive voltage scan, the scan of the overdrive voltage is performed; and after the start of the overdrive voltage scan delay for a predetermined time interval, the final drive voltage is performed. scanning. This predetermined time interval refers to the interval (or period) corresponding to a given number of scan lines.

Tracking scan is a technique that scans multiple frame data at regular intervals. Here, a plurality of frames can be referred to as sub-frames, respectively. In the three-stage overdrive technology, the pre-drive, over-drive and final drive scans of the three sub-frames are performed.

However, as shown in the first example of the background art of the present invention, when the tracking scan is performed separately, the number of polarity inversions of the source bus bar is increased, and the amount of power consumption is also increased. In order to avoid this, the driving device of this embodiment controls the gate according to the following manner. The drive circuit 5 and the source drive circuit 7 further drive the display device 1. Thereby, the number of polarity inversions of the source bus bar voltage can be reduced.

First, as shown in Fig. 4, the full scan period of one picture including the vertical blanking signal in this embodiment is equal to an odd number of scan line periods. That is, the full scan period is equivalent to an odd multiple of the scan line period. Each scanning line period is a period for scanning one gate line GL.

In detail, as shown in FIG. 4, the full scan period of one screen includes the display area period and the vertical blank period. The display area period is a scanning period of the display area, that is, a scanning line period corresponding to the number of horizontal scanning lines (the number of gate lines). The number of horizontal scanning lines is generally an even number, so the display area period is equivalent to an even number of scanning line periods. In contrast, the vertical blanking period is set to an odd number of scanning line periods. By this setting, the full scan period is an odd number of scan line periods, so the number of polarity inversions of the source bus bar during the full scan period is an odd number of times.

Secondly, as shown in Fig. 5, in the present embodiment, the time interval of the tracking scan is equivalent to an odd number of scanning line intervals (or scanning line periods). Next, in the third embodiment, in the embodiment, between the plurality of sub-frames constituting a picture frame and sequentially written, the polarity of the writing voltage of each pixel is inverted for each sub-frame. .

Figure 5 shows a schematic diagram of the tracking scan pattern over time on a source busbar. The "P" in the figure indicates the pixel driven by the pre-drive voltage. The same "O" and "L" indicate the pixels driven by the overdrive voltage and the final drive voltage, respectively. "+" and "-" are The write polarity of the source bus when driving. As shown in the figure, in the present embodiment, the time interval between sub-frames is equivalent to an odd number of scanning line periods, and the example in the drawing is three scanning line periods.

Further, as shown in Fig. 5, on the same scanning line n, the pre-drive voltage is "+", the overdrive voltage is "-", and the final drive voltage is "+". On the next scan line n+1, the pre-drive voltage is "-", the overdrive voltage is "+", and the final drive voltage is "-". Therefore, the polarity is reversed in the pre-drive, over-drive, and final drive, so the polarity of each pixel is inverted between each sub-frame.

Figure 5 is a diagram showing the pattern of tracking scans in a source bus bar SB. In the case of performing the column inversion driving, the adjacent source bus bars SB also perform the same tracking scan operation. In the case of performing dot inversion driving, the polarities of adjacent pixels on adjacent source bus bars SB are inverted. In addition to the polarity reversal, the driving principle of the source bus bar SB is the same. Therefore, in the following description, the present invention will be described focusing on the case of one source bus bar SB as in the fifth drawing.

Further, when the display device 1 described above is driven, the polarity of one pixel is sequentially inverted at the time of pre-drive, over-drive, and final drive. This point is not problematic when the display device 1 is driven. Since the liquid crystal molecules respond to the absolute value of the voltage difference, even if the polarity of the voltage difference is reversed, the liquid crystal molecule response is the same. Therefore, even if the polarity of each sub-frame is reversed, it will not cause adverse effects on the pixel action. The present invention focuses on the characteristics of the liquid crystal molecules. Therefore, using this feature, the number of polarity inversions of the source busbar can be reduced without affecting the liquid crystal action to perform The above drive control.

Next, the polarity inversion operation of the source bus bar voltage in the configuration of the display device 1 described above will be described. Figure 6 is a schematic illustration of the polarity variation pattern of the source busbar voltage during a full scan of a frame. The schematic diagram of Fig. 6 is hereinafter referred to as a polarity map. The polarity map can also be called a polarity table.

Figure 6 shows the polarities of the two frames (frame n, frame n+1). Each segment of the polarity map corresponds to one scan line period. In each frame, as shown by the arrow in the polarity diagram, the pre-drive, overdrive and final drive of the first segment are performed in sequence; then, the pre-drive and overdrive of the second segment are performed sequentially. And the final drive. By continuing this action, the entire polarity map (one frame) can be scanned.

As shown in Fig. 6, since the display device 1 performs column inversion driving or dot inversion driving, the polarity of each scanning line is reversed.

In addition, in the embodiment, since the complete scanning period of one frame is set to an odd number of scanning lines, in FIG. 6, the number of segments of the polarity map (=full scanning period) is an odd number, specifically 13. In addition, the vertical blanking signal (B) is also equivalent to an odd number of scanning lines, specifically one scanning line period. It should be noted that, in order to simplify the explanation, the polarity map of Fig. 6 uses a smaller number of scanning lines than the actual case (the same applies to the other polarity patterns described below).

Further, as indicated by the symbol X in Fig. 6, the time interval between the sub-frames is an odd number of scanning line intervals, specifically, five scanning line intervals (in the example of Fig. 5, the time interval is three). Scan line interval, number In the example of Figure 6, the time interval is 5 scan line intervals).

In detail, if the pre-driving portion is viewed from the longitudinal direction, the scanning lines 1, 2, 3, ... are sequentially driven from one frame. The overdriving portion of the scanning line 1 and the pre-driving portion of the scanning line 6 are performed during the same scanning line period. Thereby, the time for driving each scanning line by the overdrive portion is five scanning lines later than the pre-driving portion.

Next, the final driving portion of the scanning line 1 and the overdriving portion of the scanning line 6 are performed during the same scanning line period. Thereby, the time for driving each scanning line by the final driving portion is more than five scanning lines later than the overdriving portion.

Further, as indicated by the symbol Y in Fig. 6, between the plurality of sub-frames constituting one frame and sequentially written, the pixel polarities are inverted between each sub-frame. Taking scan line 1 as an example, the pixel of scan line 1 is driven by "+" during pre-drive; when overdrive, the picture of scan line 1 is driven by "-". In addition, at the final drive, the pixels of scan line 1 are driven by "+". The same is true for other scan lines, and the polarity of each pixel is inverted between each sub-frame.

In addition, since the column inversion driving or the dot inversion driving is employed, as described above, the polarities of the upper and lower pixels are inversion relations. In addition, the polarity of each pixel is also inversely related between each frame. Therefore, in frame n, the polarity of a pixel in pre-drive, over-drive, and final drive is "+, -, +", and in the frame n+1, the same pixel is pre-driven, The polarity in overdrive and final drive is "-, +, -".

In the present embodiment, the display device 1 is driven in the above manner. its As a result, as shown in Fig. 6, the polarity of the source bus bar SB is the same during each scanning line. Therefore, the number of polarity inversions of the source bus bar SB can be reduced.

Fig. 7 is a view showing the operation of the display device 1 of the present embodiment. Fig. 7 is a view showing the operation of the display device 1 of the present invention in the same form as Fig. 1 of the prior art. In Fig. 7, the gate drive timing, the source bus voltage waveform, and the source bus bar polarity change with the elapse of time are shown from top to bottom, respectively. The line cycle time or line period indicates the period of the scan line drive. Each scanning line period is a time for driving one gate line GL.

As shown in the diagram of the gate drive timing, the trace scan is a scan that performs pre-drive, over-drive, and final drive. In the example of the diagram, the time interval is 3 scan line intervals (although the time interval between the sub-frames in the example of Fig. 6 is 5 scan line intervals, for the sake of easy understanding, the example shown in Fig. 7 The time interval is 3 scan line intervals). Further, as shown, the pre-drive, overdrive, and final drive are performed during the first 1/3 period, the middle 1/3 period, and the last 1/3 of each scan line period, respectively.

The timing of the above-described tracking scan is the same in the first drawing of the prior art and the seventh drawing of the present embodiment. However, after comparing FIGS. 1 and 7 , it can be found that in the prior art, the polarity of the source bus bar voltage is inverted three times during one scanning line, and in the present embodiment, within one scanning line period. The source bus voltage polarity remains the same.

This difference is caused by the source bus voltage between the above sub-frames. Polarity reversal is achieved. In scan line 1, the pre-drive is "+", the overdrive is "-", and the final drive is "+". In scan line 2, the pre-drive is "-", the overdrive is "+", and the final drive is "-". As a result of the polarity inversion between the respective source busbars, as shown in FIG. 7, the polarity of the source busbar voltage during each scanning line period remains unchanged.

Next, the present embodiment and the conventional technique are compared based on the polarity map. Fig. 8 is a polarity diagram corresponding to the conventional technique of Fig. 1. In this prior art, the full scan period is equal to an odd number of scan line periods (13 scan line periods). In addition, the time interval between sub-frames is also an odd number of scan line intervals (5 scan line intervals).

However, the difference between this embodiment and the prior art is that the polarity of the prior art between the sub-frames is not reversed. In frame n, the pre-drive of scan line 1 is "+", the overdrive is "+", and the final drive is "+". The pre-drive of scan line 2 is "-", the overdrive is "-", and the final drive is "-". As a result, as shown in Fig. 8, the polarity of the source bus bar voltage was inverted three times during each scanning line. In contrast, the present invention can significantly reduce the number of polarity inversions of the source bus bar voltage as shown in FIG.

Further, as explained below, the advantage of this embodiment is that the degree of improvement in image quality can be improved. Figure 9 is a polarity diagram showing other modes. The time interval between the sub-frames in Fig. 9 is an odd number of scanning line intervals, which is the same as the embodiment of Fig. 6. Further, as in the present embodiment, the polarity between the sub-frames is inversely related.

However, the difference from the embodiment is that the masking period in FIG. 9 is an even number of scanning lines, and the full scanning period of one frame is also An even number of scan lines. As a result, as shown in the figure, during the first five scanning lines (from the first to the fifth), the polarity of the overdrive and the final drive are the same, and the polarity of the pre-drive is different. During the next 5 scan lines (from 6th to 10th), the pre-drive and overdrive polarities are the same, but different from the final drive polarity. Therefore, the pattern of polarity has changed on the way. The discontinuity and inconsistency of this style can lead to deterioration of image quality. In the present invention, since the polarity pattern is the same on all the scanning lines, the pattern has continuity, whereby the deterioration of the above image quality can be avoided.

The above is a description of the first embodiment of the present invention. As described above, in the display device driving device of the present invention, the gate driver and the source driver perform column inversion driving or dot inversion driving on the display device, and are offset between a plurality of sub-frames in one frame. A time interval is used to perform a tracking scan. Therefore, the driving device of the present invention is for controlling the gate driver and the source driver. The control mode is that a complete scanning period including a vertical blanking signal in one picture is set to an odd number of scanning lines; the number of sub-picture frames is an odd number; the time interval of the tracking scanning is equal to an odd number of scanning line intervals; forming a picture frame And the polarity of each pixel in the plurality of sub-frames sequentially written is reversed between the sub-frames.

As described above, in the present invention, (1) the entire scanning period including the vertical blanking signal in one picture is set to an odd number of scanning lines; (2) the number of sub-picture frames is odd (in the above example, (3) The time interval of the tracking scan is equal to an odd number of scanning line intervals; (4) the polarity of each pixel in the plurality of sub-frames constituting a picture frame and sequentially written, between the sub-frames Reverse. With this structure, during one scan line, for each The source bus bar sequentially feeds the plurality of source bus signals corresponding to the plurality of sub-frames. The plurality of source bus signals are respectively supplied to the complex scan lines (complex pixels) of the offset tracking scan interval. Therefore, in the present invention, the voltage polarity of the plurality of source busbar signals is the same during one scanning line period, so that the number of times of inversion of the source busbar voltage is reduced, thereby reducing power consumption.

Further, in the present embodiment, the number of polarity inversions of the source bus line signal and the common voltage signal can be reduced, so that the source signal and the common signal generating circuit can be reduced. In addition, since the inversion pattern of the source bus bar and the polarity inversion of the common signal maintains continuity (consistency), it is possible to avoid deterioration of image quality and to obtain better image quality.

Second embodiment

Next, a second embodiment of the present invention will be described. The following mainly describes differences from the first embodiment, and the same matters as those of the first embodiment are omitted.

In the present embodiment, the overall structure of the display device and its driving device is the same as that of the first embodiment, and reference can be made to FIG. In addition, the first embodiment and the second embodiment are the same in the following points. That is, a column inversion drive or a dot inversion drive is employed. Perform a three-stage overdrive in a tracking scan mode. The full scan period of a picture containing a vertical blanking signal is equal to an odd number of scan line periods.

However, the first embodiment is different from the second embodiment in that the time interval between sub-frames in the first embodiment is equal to an odd number of scan lines, Relatively in the second embodiment, the time interval between sub-frames is equal to an even number of scanning line periods. Further, in the first embodiment, between the plurality of sub-frames constituting a picture frame and sequentially written, the pixel polarities are inversely related between the sub-picture frames. However, in the second embodiment, the polarity of each sub-frame is not reversed between the plurality of sub-frames constituting a picture frame and sequentially written.

Fig. 10 is a view showing a polarity map corresponding to the display device of the embodiment. As shown in the figure, in the present embodiment, the time interval between sub-frames is an even number of scan line intervals, specifically, four scan line periods.

In addition, the polarity of the same scan line in the same frame is the same (non-inverted) in pre-drive, overdrive, and final drive. For example, for scan line 1 of frame n, pre-drive is "+", overdrive (after 4 scan lines) is "+", and final drive (after 4 scan lines) It is "+". Similarly, for scan line 2, the pre-drive is "-", the overdrive is "-", and the final drive is also "-".

In the example of Fig. 10, the polarity of the source bus bar SB is the same during each scanning line. Therefore, the number of polarity inversions of the source bus bar SB can be reduced.

As described above, in the second embodiment of the present invention, the driving device of the display device is constructed by performing column inversion driving or dot inversion driving, and is offset between a plurality of sub-frames constituting a picture frame. Tracking scans are performed by shifting the time interval. Therefore, in the driving apparatus of the present invention, (1) the entire scanning period including the vertical blanking signal in one screen is set to an odd number of scanning lines; (2) the number of sub-frames is odd; (3) The time interval of the tracking scan is equal to the even number of scanning line intervals; (4) the polarities of the pixels in the plurality of sub-frames constituting a picture frame and sequentially written are not inverted between the sub-frames. With this configuration, the voltage polarities of the plurality of source busbar signals are the same during one scanning line, so that the number of inversions of the source busbar voltage is reduced, thereby reducing power consumption.

Further, in the present embodiment, the inversion pattern continuity (consistency) as described in the first embodiment can be maintained, so that the deterioration of the image quality can be avoided, and a better image quality can be obtained.

Third embodiment

Next, a third embodiment of the present invention will be described. The following mainly describes differences from the first embodiment, and the same matters as those of the first embodiment are omitted.

In the present embodiment, the overall structure of the display device and its driving device is the same as that of the first embodiment, and reference can be made to FIG. In addition, the first embodiment and the third embodiment are the same in the following points. That is, a column inversion drive or a dot inversion drive is employed. The full scan period containing a vertical blanking signal in one picture is equal to an odd number of scan line periods.

However, the first embodiment differs from the third embodiment in that, in the first embodiment, three-stage overdrive is performed using the tracking scan, and in the third embodiment, the two-stage overdrive is performed using the tracking scan. In detail, each pixel is driven by an overdrive voltage and then driven by the final drive voltage.

In addition, in the first embodiment, the time interval between sub-frames is equal to An odd number of scan line intervals. However, in the third embodiment, the time interval between sub-frames is an arbitrary value, whether it is an even scan line interval or an odd scan line interval.

Further, in the first embodiment, between the plurality of sub-frames constituting a picture frame and sequentially written, the pixel polarities are inversely related between the sub-picture frames. In contrast, in the third embodiment, the polarity of each sub-frame is not reversed between the plurality of sub-frames constituting a picture frame and sequentially written.

The display device and the driving device of the present embodiment are configured to satisfy the above conditions. In order to satisfy the above conditions, the two polarity patterns shown in Figs. 11 and 12 can be applied. Either of these two polarity maps can be applied.

In Fig. 11, the full scan period is equal to an odd number of scan line periods (13 scan lines). The number of sub-frames is even (both overdrive and final drive). The time interval for tracking scans (overdrive and final drive) is an even number of scan line intervals, specifically 4 scan line periods. For example, when the scan line 1 is driven by the final drive, the scan line 5 is driven by overdrive.

In addition, the polarity of the same scan line in the same frame is the same (non-inverted) in overdrive and final drive. For example, for scan line 1 of frame n, the overdrive is "+" and the final drive (after 4 scan lines) is also "+". Similarly, for scan line 2, the overdrive is "-" and the final drive is also "-".

As seen in the example of Fig. 11, the polarity of the source bus bar SB is the same during each scanning line. Therefore, it is possible to reduce the source bus bar SB The number of polarity reversals.

In Fig. 12, the time interval between sub-frames is an odd scan line interval, specifically 5 scan line intervals. For example, when the scan line 1 is scanned with the final drive, the scan line 6 is scanned with overdrive.

In addition, the polarity of the same scan line in the same frame is the same (non-inverted) in overdrive and final drive. For example, for scan line 1 of frame n, the overdrive is "+" and the final drive (after 5 scan lines) is also "+". Similarly, for scan line 2, the overdrive is "-" and the final drive is also "-".

As seen in the example of Fig. 12, the polarity of the source bus bar SB is reversed during each scanning line. However, the polarity of the second half of each scan line period is the same as the polarity of the first half of the next scan line period. Therefore, the number of polarity inversions can be suppressed to the same extent as the example of Fig. 11.

As described above, in the third embodiment of the present invention, the driving device of the display device is configured to perform column inversion driving or dot inversion driving, and is offset between a plurality of sub-frames constituting a picture frame. Tracking scans are performed by shifting the time interval. Therefore, in the driving apparatus of the present invention, (1) the entire scanning period including the vertical blanking signal in one screen is set to an odd number of scanning lines; (2) the number of sub-frames is even (two stages in the above example) (3) The time interval of the tracking scan is equal to an odd or even number of scanning line intervals (arbitrary); (4) the polarity of each pixel in the plurality of sub-frames constituting a picture frame and sequentially written in each The sub-frames are not reversed. With this configuration, the voltage polarities of the plurality of source busbar signals are the same during one scan line, so that the number of inversions of the source busbar voltage is lowered. Low, which in turn reduces power consumption.

Further, in the present embodiment, the inversion pattern continuity (consistency) as described in the first embodiment can be maintained, so that the deterioration of the image quality can be avoided, and a better image quality can be obtained.

In addition, in the present embodiment, a two-stage overdrive technique is employed, that is, the overdrive voltage and the final drive voltage are sent to the respective pixels. In other examples, a manner of sequentially feeding the pre-drive voltage and the overdrive voltage to each pixel may also be employed. The pre-drive voltage is set to a predetermined value smaller than the overdrive voltage. At this time, the overdrive voltage is controlled in such a manner that the required write voltage can be achieved within the write time. Thereby, the voltage of each pixel corresponds to the value of the image to be displayed (less than the value of the overdrive voltage). This technique can also be referred to as a two-stage overdrive technique. This point is also the same in the fourth embodiment described below.

Fourth embodiment

Next, a fourth embodiment of the present invention will be described. The following mainly describes differences from the third embodiment, and the same matters as those of the first and third embodiments are omitted.

In the present embodiment, the overall structure of the display device and its driving device is the same as that of the first embodiment, and reference can be made to FIG. In addition, the third embodiment and the fourth embodiment are the same in the following points. That is, a column inversion drive or a dot inversion drive is employed. The full scan period containing a vertical blanking signal in one picture is equal to an odd number of scan line periods. Perform two-stage overdrive with tracking scan. The time interval between sub-frames is any value, whether it is even Scan line spacing or odd scan line spacing is fine.

However, the third embodiment is different from the fourth embodiment in that, in the third embodiment, between the plurality of sub-frames constituting a picture frame and sequentially written, the pixel polarities are not reversed between the sub-picture frames. turn. In contrast, in the fourth embodiment, between the plurality of sub-frames constituting a picture frame and sequentially written, the pixel polarities are inversely related between the sub-picture frames. In the fourth embodiment, the polarity of each sub-frame between consecutive individual frames is not reversed. That is, the pixel polarity between the last sub-frame of one frame and the first sub-frame of the next frame is not reversed.

The display device and the driving device of the present embodiment are configured to satisfy the above conditions. In order to satisfy the above conditions, the two polarity patterns shown in Figs. 13 and 14 can be applied. Either of these two polarity maps can be applied.

Fig. 13 is the same as Fig. 11, and the full scan period is equal to an odd number of scan lines (13 scan lines). The number of sub-frames is even (both overdrive and final drive). The time interval for tracking scans (overdrive and final drive) is an even number of scan line intervals, specifically 4 scan line periods.

However, the difference between Fig. 13 and Fig. 11 is that in Fig. 11, in a frame, the polarities of the pixels are the same between the overdrive and the final drive. Relatively in Figure 13, between the overdrive and final drive of a frame (that is, between the initial write sub-frame and the last write sub-frame of a frame), the polarity of each pixel is reversed. turn. In contrast, between the final drive that constitutes a frame and the overdrive that constitutes the next frame (that is, the last write in a frame) The sub-frames are the same as the sub-frames in which the next frame is originally written. Specifically, in the scan line 1 of the frame n, the polarity of the overdrive is "+", the polarity of the final drive is "-", and in the frame n+1, the polarity of the overdrive is "-". The polarity of the final drive is "+". Therefore, the polarity is maintained and not reversed between the final drive of frame n and the overdrive of frame n+1.

Thereby, although the polarity between each sub-frame is reversed in Fig. 13, the polarity between the frames remains unchanged. The pattern in Figure 11 is represented by "++--", and the pattern in Figure 13 is represented by "+--+".

The above is a description of the polarity diagram of Fig. 13. The example of Fig. 13 is the same as the case of Fig. 12, that is, the polarity of the second half of each scanning line is the same as the polarity of the first half of the next scanning line. Therefore, the number of polarity inversions can be suppressed to about the same extent as the examples of Figs. 11 and 12.

The 14th figure can be regarded as a modification of Fig. 12. As in Fig. 12, the time interval between the sub-frames of Fig. 14 is an odd number of scanning line intervals, specifically five scanning line intervals.

However, Fig. 12 is the same as Fig. 11, and the above-mentioned "++--" pattern is used, and the polarity between the sub-frames is not reversed between the plurality of sub-frames constituting a picture frame and sequentially written. In contrast, Fig. 14 is the same as Fig. 13, and is a pattern of "+--+". Therefore, although the polarity between the sub-frames is reversed between the plurality of sub-frames constituting a frame and sequentially written, the final drive in a frame (that is, the last written in a frame) The polarity remains unchanged between the frame and the next frame (that is, the sub-frame originally written in the next frame).

As a result, in the example of Fig. 14, the polarity of the source bus bar SB remains the same during each scanning line. Therefore, the example of Fig. 14 can also reduce the number of polarity inversions of the source bus bar SB.

As described above, in the fourth embodiment of the present invention, the driving device of the display device is configured to perform column inversion driving or dot inversion driving, and is offset between a plurality of sub-frames constituting a picture frame. Tracking scans are performed by shifting the time interval. Therefore, in the driving apparatus of the present invention, (1) the entire scanning period including the vertical blanking signal in one screen is set to an odd number of scanning lines; (2) the number of sub-frames is even (two stages in the above example) (3) The time interval of the tracking scan is equal to an odd or even number of scanning line intervals (arbitrary); (4) the polarity of each pixel in the plurality of sub-frames constituting a picture frame and sequentially written in each The sub-frames are reversed, and the polarity of each pixel is not reversed between the sub-frames that were last written in a frame and the sub-frames that were originally written in the next frame. With this configuration, the number of times of inversion of the source bus bar voltage is lowered, and power consumption can be reduced.

Further, in the present embodiment, the inversion pattern continuity (consistency) as described in the first embodiment can be maintained, so that the deterioration of the image quality can be avoided, and a better image quality can be obtained.

As described in the first to fourth embodiments, the present invention can be applied to an overdrive technique. However, the invention is not limited to use in overdrive technology. The driving device of the display device is driven by column inversion driving or dot inversion driving, and the tracking scanner is executed, and the present invention is applicable. For example, in the case of using tracking scanning for other purposes of preparing for driving, the present invention also Can be applied. Other examples of tracking scans, such as black insertion techniques. In the black insertion technique, after writing the target voltage, the black level voltage is written to the pixels to improve the animation response. The present invention is not limited to the overdrive technique, and this is the same in the case of the other embodiments below.

Gate drive structure

The following description can be applied to the structure of the gate driving circuit 5 for driving the display device of this embodiment. For the gate driving circuit 5, the following is a case where (1) the block control is performed, and (2) the block control is not performed.

(1) Implementation of block control In this case, as shown in Fig. 15, the gate driving circuit 5 is composed of a plurality of gate driving blocks. In Fig. 15, each of the gate driving blocks is an IC chip.

Each gate drive block is used to drive a block containing a plurality of gate lines. Three blocks A, B, C are labeled in Figure 15 and three IC chips are labeled. The three blocks A, B, and C share the start pulse wave STV. The start pulse STV is the trigger pulse that starts scanning and is provided by the control circuit to blocks A, B, and C. In addition, the inter-blocks are connected by a delivery pulse signal line for maintaining operational continuity. On the other hand, the enable signals of the three blocks A, B, and C are different. As shown, the three blocks A, B, and C receive different gate enable signals GOE1, GOE2, GOE3 from the control circuit, thereby enabling the individual control of the block.

The number of scan lines of each block is set equal to the tracking scan interval The number of scan lines. If the tracking interval is D scanning line intervals, the number of scanning lines of the block is also n.

In the above example, in the present invention, the gate driving circuit 5 is composed of a plurality of gate driving blocks, and each of the gate driving blocks is used to drive a plurality of gate lines. The complex gate drive block is controlled by individual enable signals, thereby enabling the enabling control of the individual gate drive blocks.

Secondly, in the present invention, the boundary of the gate driving block is a scanning position and one or more blocks of one or more sub-frames except the last sub-frame when scanning is started at the last sub-frame constituting a picture frame. The boundaries are set in a consistent manner. In the above example, the number of scanning lines of each block is set to be equal to the number of scanning lines of the time interval, whereby the boundary of the gate driving block is set to the number of scanning lines at intervals, so that the boundary satisfying the above requirements can be achieved. set up.

The setting of the above boundary will be described in detail below. In the case of performing the tracking scan of the plurality of sub-frames, when the last sub-frame starts scanning, the scanning of the other sub-frames has been performed before the number of scanning lines corresponding to the time interval. In this embodiment, as described above, the block boundary is a scanning position of one or more sub-frames other than the last sub-frame and more than one block boundary when scanning is started when the last sub-frame constituting a picture frame is started. Set in a consistent manner. In detail, the block boundary is set in such a manner that the scan lines of the other sub-frames and the boundaries of the previous scan lines coincide when the original scan line is scanned in the last sub-frame. For example, in a display device that performs two-stage overdrive, the time interval is n scan line intervals. At this time, the block boundary is set to the nth scan line and the n+1th scan line. between. In addition, in the case of three stages, the block boundary is set between the 2nth scan line and the 2n+1th scan line.

In addition, the scope of application of the present invention can satisfy the above requirements (that is, when the last sub-frame constituting a picture frame starts scanning, the scanning position of one or more sub-frames other than the last sub-frame and one or more block boundaries respectively Consistently, the location of other block boundaries is not limited. It can also be designed as multiple block boundaries. For example, the number of scanning lines of each block can also be set to half, and each block is further divided into two pieces, which can also be regarded as a modification of FIG.

Fig. 16 shows another structural example of the gate driving circuit. In this example, the gate driving circuit can be formed on the glass substrate together with the display portion, for example, a low temperature poly-silicon (LTPS) circuit or an amorphous silicon (a-Si, amorphous silicon) formed on the glass substrate. The circuit, in addition, the gate drive circuit can also be an integrated circuit of a single chip. The gate driving circuit is composed of a plurality of functional blocks, and each functional block has the same gate driving block function as the driving IC of FIG.

Fig. 17 shows an example of the operation when the above block control is executed. The start pulse wave STV and the gate control clock GLK are common to all blocks A, B, and C. Pulse waves P are generated corresponding to the signals STV and GLV. Then, in each block, the pulse wave P is synthesized with the gate enable signal, and as a result, as shown in the figure, each scanning line is driven at a diagonal portion of each pulse wave P.

As shown, the gate enable signals GOE1, GOE2, GOE3 provided to blocks A, B, and C, respectively, are staggered from each other. Therefore, it is suitable The implementation realizes staggering the driving timing between blocks, and sequentially performs pre-drive, over-drive and final drive tracking scans.

Figure 18 shows an example of other operations in the case of performing block control. In this example, the enabling control is also performed individually for each block, so that it is possible to appropriately perform the tracking scan of the pre-drive, overdrive, and final drive in sequence.

Also in the example of Fig. 18, block A is performing all of the pre-drive, overdrive, and final drive during the first 1/3 of a scan line period. Similarly, block B is performing all three types of driving during the middle 1/3 of one scan line period. In addition, block C performs all three types of driving during the last 1/3 of a scan line period.

As described above, in the embodiment, the gate driving circuit includes a plurality of gate driving blocks, and each of the gate driving blocks is used to drive a plurality of gate lines, and the plurality of gate driving blocks are caused by individual The signal can be controlled. Secondly, the boundary of the gate driving block is that when the last sub-frame of the frame is scanned, the scanning position of one or more sub-frames other than the last sub-frame is consistent with more than one block boundary. Way to set.

Therefore, in the present embodiment, in the case where the tracking scan is performed by the block control, the block boundary can be appropriately set, whereby the scanning of the other sub-frames is started when the last sub-frame constituting one frame starts scanning. The position and the previous position boundary are respectively consistent. With this structure, each block can be controlled by an enable signal.

(2) Case where block control is not performed Next, the case where the enabling control of each block is not performed in the above-described gate driving block will be described.

Fig. 19 shows an example of the structure of the gate driving circuit 5. In the example of Fig. 19, the gate lines are divided into three groups A, B, and C. All gate lines of groups A, B, and C are controlled by a gate drive circuit. The gate drive circuit can also be an IC chip. Further, the gate driving circuit may be a circuit such as LTPS or a-Si formed on the glass. The gate drive circuit drives the groups A, B, and C using the start pulse wave STV input from the control circuit and the gate enable signals GOE1, GOE2, and GOE3.

In the above embodiment, an enable signal is used in each block, and such block control is not applied to the structure of Fig. 19. In Fig. 19, a gate drive circuit uses all of the enable signals GOE1, GOE2, and GOE3 to drive all groups A, B, and C (each group is driven by using all enable signals). .

In order to perform the present embodiment, it is preferable to set the number of gate enable phases to be larger than the number of sub-frames. Specifically, when three-stage overdrive is performed, the number of sub-picture frames is three, and the number of gate enable phases is set to three or more.

In addition, in the present embodiment, the insertion phases between the sub-frames are arranged at different enable phases for each time interval. For example, when the insertion phase at the beginning of a time interval is configured in one gate enable phase, the insertion phase at the beginning of the next time interval is placed in the other gate enable phase, and the next insertion phase is also placed in Other brakes Extreme phase.

Further, in the case of the present embodiment, the gate-driving circuit is constituted by a repetitive combination of n-phase circuits using control signals of at least two phases or more. Therefore, the entire circuit is preferably set to an integral multiple of the repeating circuit.

Further, in the present embodiment, the unit of the repeating circuit is preferably set to an odd scanning line. In detail, in the present embodiment, the full scan period including vertical blanking is equal to an odd number of scan lines. In order to match a full scan period equal to an odd number of scan lines, a structure having one unit repeat circuit equal to an odd number of scan lines is required.

Fig. 20 and Fig. 21 are timing charts showing an example of the operation of the display device. In this example, the number of gate lines for each group is "3n+2" (n is a positive integer).

Figure 20 shows the enable signals GOE1, GOE2, GOE3 of each group and the enable signals GOE1, GOE2, GOE3 synthesized by the three groups. The enable signals GOE1, GOE2, GOE3 synthesized in the figure are supplied from the control signal to the gate driving circuit (IC wafer of Fig. 19). As shown in Fig. 20, the composite enable signals GOE1, GOE2, and GOE3 are assigned to drive groups A, B, and C.

In Fig. 20, the time intervals 1, 2, and 3 are equivalent to the time interval of the tracking scan. At the beginning of time interval 1, the pulse wave of the enable signal GOE1 is set. Therefore, in time interval 1, the insertion phase of the sub-frame is configured to enable signal GOE1. Similarly, in time interval 2, the insertion phase of the sub-frame is configured to enable signal GOE3. In addition, time interval 3 In the middle, the insertion phase of the sub-frame is configured to the enable signal GOE2.

Therefore, in Fig. 20, the insertion phase between the sub-frames is assigned to different enable phases in each time interval. As a result, as shown in Fig. 21, the pre-driving, overdriving, and final driving sub-frames can be scanned in a time-interval manner to realize tracking scanning.

Fig. 22 shows another operation example of the display device. In this example, each group scan line corresponds to the case of "3n+1" (n is a positive integer). In this example, the insertion phase between sub-frames is also assigned to different enable phases in each time interval. Therefore, as shown in Fig. 21, tracking scanning of three sub-frames can be realized.

As described above, in the present embodiment, the tracking scan can be realized even if the enabling control of each block is not performed. It can fix the time interval phase corresponding to the repetitive circuit, increase the degree of freedom in timing design, and select the most suitable timing from the angle of image quality. In addition, it can maintain the continuity of the source bus and the common signal, avoiding the degradation of image quality.

Further, the embodiment is a display device having a driving device. The invention does not limit the type of drive means. Other examples of the invention may be like a display device. Further, another example of the present invention may be an electronic device having the display device of the above-described driving device. The electronic device can be any of a mobile phone, a personal digital assistant (PDA), a notebook computer, a car navigation device, a television, a digital camera, and a liquid crystal display device.

The present invention has been disclosed in the above preferred embodiments, and is not intended to limit the scope of the present invention. In the spirit and scope of the present invention, the scope of protection of the present invention is defined by the scope of the appended claims.

1‧‧‧ display device

3‧‧‧Display Department

5‧‧‧ gate drive circuit

7‧‧‧Source drive circuit

9‧‧‧Control circuit

11‧‧‧CPU

GL‧‧‧ gate line

SB‧‧‧Source bus

Fig. 1 is a view showing an example of the use of tracking scanning in the overdrive technique in the conventional display device.

Fig. 2 is a view showing the display device of the first embodiment of the present invention.

Fig. 3 is a view showing the column inversion driving and the dot inversion driving.

Fig. 4 is a view showing a complete scanning period including vertical blanking in one screen.

Fig. 5 is a view showing the tracking scan of this embodiment.

Fig. 6 is a view showing the polarity pattern of the pattern in which the polarity of the source bus bar changes during the entire scanning period of the 1 frame during the tracking scan of the present invention.

Fig. 7 is a timing chart showing the operation of the display device of this embodiment.

Fig. 8 shows a polarity diagram corresponding to the driving technique of the display device in the prior art.

Figure 9 shows the polarity map in the case where the discontinuity and non-uniformity of the polarity change pattern cause the deterioration of the block image quality.

Fig. 10 is a view showing the polarity of the case where the display device is driven in the second embodiment.

Fig. 11 is a view showing the polarity of the first example in the third embodiment.

Fig. 12 is a view showing the polarity of the second example in the third embodiment.

Fig. 13 is a view showing the polarity of the first example in the fourth embodiment.

Fig. 14 is a view showing the polarity of the second example in the fourth embodiment.

Figure 15 is a diagram showing an example of a gate driving circuit in the case of performing each block enabling control.

Figure 16 is a diagram showing an example of a gate drive circuit in the case of performing each block enable control.

Figure 17 is a diagram showing an example of the operation of the display device when each block enabling control situation is performed.

Figure 18 is a diagram showing an example of the operation of the display device when each block enabling control situation is performed.

Figure 19 is a diagram showing an example of a gate driving circuit when each block enabling control situation is not performed.

Figure 20 is a diagram showing an example of the operation of the display device when each block enabling control situation is not performed.

Figure 21 is a diagram showing an example of the operation of the display device when each block enabling control situation is not performed.

Figure 22 is a diagram showing an example of the operation of the display device when each block enabling control situation is not performed.

1‧‧‧ display device

3‧‧‧Display Department

5‧‧‧ gate drive circuit

7‧‧‧Source drive circuit

9‧‧‧Control circuit

11‧‧‧CPU

GL‧‧‧ gate line

SB‧‧‧Source bus

Claims (13)

A driving device for driving a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving a plurality of gate lines of the display device, The gate driver and the source driver jointly perform column inversion driving or dot inversion driving on the display device, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; And a control device for controlling the gate driver and the source driver, wherein a vertical scanning period of a vertical blanking signal is equal to an odd number of scanning lines, and the number of the sub-frames is an odd number, and the tracking scan is performed. The above time interval is equal to an odd number of scan lines, and the polarity of each pixel between the sub-frames is inverted between the plurality of sub-frames constituting a picture frame and sequentially written. A driving device for driving a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving a plurality of gate lines of the display device, The gate driver and the source driver jointly perform column inversion driving or dot inversion driving on the display device, and performing tracking scanning to form a plurality of sub-frames of a frame to be offset by a predetermined time interval. And scanning means for controlling the gate driver and the source driver, wherein the number of the sub-frames is an odd number during a complete scanning period in which a vertical blanking signal is equal to an odd number of scanning lines in one picture, The above-mentioned time interval of the above-mentioned tracking scan is equal to the even-numbered scanning line period, and the polarity of each pixel between the sub-frames is not reversed between the plurality of sub-frames constituting a picture frame and sequentially written. A driving device for driving a display device, comprising: a source driver for driving a plurality of source bus bars of the display device; and a gate driver for driving a plurality of gate lines of the display device, The gate driver and the source driver jointly perform column inversion driving or dot inversion driving on the display device, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; And a control device for controlling the gate driver and the source driver, wherein a full scan period of the vertical blanking signal in one picture is equal to an odd number of scan lines, and the number of the sub-picture frames is an even number, and the tracking scan is performed. The above time interval is equal to an odd or even number of scan lines, and the polarity of each pixel between the sub-frames is not reversed between the plurality of sub-frames constituting a picture frame and sequentially written. A driving device for driving a display device for driving the display device, comprising: a source driver for driving the plurality of source busbars of the display device; a gate driver for driving the plurality of gate lines of the display device, wherein the gate driver and the source driver perform a column for the display device Inverting driving or dot inversion driving, and performing tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and control means for controlling the gate driver and the source driver, In a picture in which a vertical scanning period is equal to an odd number of scanning lines, the number of the sub-picture frames is an even number, and the time interval of the tracking scan is equal to an odd or even number of scanning lines, forming a picture frame. And the polarity of each pixel between the plurality of sub-frames sequentially written is reversed between each sub-frame, and the sub-frames written at the end of one frame and the sub-frames originally written by the next frame The polarity of each pixel is not reversed. The driving device of the display device according to any one of claims 1 to 4, wherein the gate driver comprises a plurality of gate driving blocks, each of the gate driving blocks drives a plurality of gate lines, and the plurality of gates The driving block is controlled by an individual enabling signal. In addition, the boundary of the gate driving block is one or more sub-pictures except the last sub-frame when the last sub-frame that constitutes a picture frame is scanned. The scanning position of the frame is set in such a manner that the boundaries of one or more blocks are identical. The driving device of the display device according to any one of claims 1 to 4, wherein the number of gate-enabled phases in the gate driver The amount is set to be larger than the number of sub-frames of the tracking scan, and the insertion phase between the sub-frames is assigned to different enabling phases at each time interval. A driving method for driving a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The bus bar performs column inversion driving or dot inversion driving on the display device, and performs tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling driving of the display device, wherein During a full scan period including a vertical blanking signal in a picture equal to an odd number of scan lines, the number of the above-mentioned sub-frames is an odd number, and the above-mentioned time interval of the above-mentioned tracking scan is equal to an odd number of scan lines, and constitutes a picture frame and is The polarity of each pixel between the plurality of sub-frames sequentially written is reversed between each sub-frame. A driving method for driving a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The bus bar performs column inversion driving or dot inversion driving on the display device, and performs tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling driving of the display device, wherein The full scan period including the vertical blanking signal in one picture is equal to the odd number of scan lines, The number of sub-picture frames is an odd number, and the above-mentioned time interval of the above-mentioned tracking scan is equal to an even number of scanning line periods, and the polarity of each pixel between each of the plurality of sub-frames constituting a picture frame and sequentially written in each sub-frame The frames are not reversed. A driving method for driving a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The bus bar performs column inversion driving or dot inversion driving on the display device, and performs tracking scanning to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; and controlling driving of the display device, wherein The period of the complete scan period including the vertical blanking signal in one picture is equal to the odd number of scan lines, the number of the above-mentioned sub-frames is an even number, and the above-mentioned time interval of the tracking scan is equal to the odd or even number of scan lines, and constitutes a picture frame. And the polarity of each pixel between the plurality of sub-frames sequentially written is not reversed between each sub-frame. A driving method for driving a display device, comprising: driving a plurality of source bus bars of the display device; driving a plurality of gate lines of the display device, wherein the gate line and the source are driven by driving The bus bar performs column inversion driving or dot inversion driving for the above display device, and performing a tracking scan to scan a plurality of sub-frames constituting a frame to be offset by a predetermined time interval; Controlling driving of the display device, wherein a full scan period of a vertical blanking signal in one picture is equal to an odd number of scan lines, the number of the sub-picture frames is an even number, and the time interval of the tracking scan is equal to an odd or even number of scan lines During the period, the polarity of each pixel between the plurality of sub-frames constituting a frame and sequentially written is reversed between each sub-frame, and the sub-frame and the next picture written at the end of the frame. The polarity of each pixel between the sub-frames in which the frame was originally written is not reversed. The driving method of the display device according to any one of claims 7 to 10, wherein the plurality of gate driving blocks of the gate driving circuit are respectively used for driving a plurality of gate lines, and the plurality of gate driving blocks It is controlled by an individual enable signal. In addition, the boundary of the gate drive block is a scan of more than one sub-frame except the last sub-frame when scanning is started at the last sub-frame that constitutes a picture frame. The position is set in such a way that the boundaries of one or more blocks are identical. The driving method of the display device according to any one of claims 7 to 10, wherein the number of gate enable phases in the gate driving circuit is set to be larger than the number of sub-frames of the tracking scan, and the insertion between the sub-frames The phase is assigned to different enabling phases at each time interval. An electronic device having a display device, comprising the driving device according to any one of claims 1 to 4, wherein the electronic device is a mobile phone, a personal digital assistant, a notebook computer, a car navigation device, Any of a television, a digital camera, and a liquid crystal display device.