JP5035671B2 - Display device driving apparatus and driving method - Google Patents

Description

  The present invention relates to a display device such as a liquid crystal display, and more particularly to a drive device and a drive method for a display device that performs chasing scanning for overdrive or the like.

  Conventionally, in a display device such as a liquid crystal display, a plurality of gate lines and a plurality of source buses intersect, a pixel is located at each intersection, and a matrix-like display region is formed by a large number of pixels. Yes. The display device is driven by a gate driving circuit and a source driving circuit. A gate driving circuit sequentially drives the plurality of gate lines. When each gate line is driven, the source driving circuit drives a plurality of source buses, and supplies a source bus voltage corresponding to an image to be displayed to each source bus. In this way, an image is displayed in the display area.

  Conventionally, inversion driving has been adopted in display devices in consideration of lifetime and the like. Although various inversion driving methods are known, the present invention mainly relates to row inversion driving and dot inversion driving. The row inversion drive inverts the polarity of the voltage applied to the pixel for each gate line. In the dot inversion drive, the polarity is inverted for each gate line and each source bus.

  By the way, in order to improve the response speed of the display device, an overdrive technique has been conventionally proposed. In the overdrive technology, first, an overdrive voltage is supplied to the source bus for each pixel, and then the last drive voltage is supplied. The last drive voltage is a signal corresponding to an image to be displayed and is also called a target voltage. The overdrive voltage is set to a predetermined value larger than the last drive voltage.

  The above example corresponds to a two-step overdrive technique of overdrive voltage and last drive voltage. As another example, a three-step overdrive technique has also been proposed. In this case, a predrive voltage, an overdrive voltage, and a last drive voltage are sequentially supplied. The predrive voltage is set smaller than the overdrive voltage.

  In another example of suitable overdrive technology, the predrive voltage and the overdrive voltage are supplied sequentially. The predrive voltage is set to a predetermined value smaller than the overdrive voltage. In this case, the overdrive voltage is controlled and supplied so that the necessary write voltage can be reached within the write time. Thereby, the voltage of each pixel becomes a value according to the image to be displayed. This technology is also one of the two-step overdrive technologies.

  In order to realize the overdrive technology, each pixel needs to be scanned a plurality of times in one frame period. As a scanning method for that purpose, a sequential scan and a chase scan can be considered.

  In the sequential scanning, the next scanning is performed on the entire screen after each scanning on the entire screen is completed. In the case of three steps, the scan of the overdrive voltage is started after the scan of the predrive voltage is completed, and the scan with the last drive voltage is started after the scan of the overdrive voltage is completed.

  On the other hand, in the chasing scan, the next scan starts in the middle of each scan (before the scan is completed to the lowest position on the screen). In the case of three steps, scanning with the overdrive voltage is started after a predetermined interval in the middle of scanning with the predrive voltage. The interval is an interval corresponding to a predetermined number of lines. Further, scanning with the last drive voltage starts after a predetermined interval from scanning with the overdrive voltage.

  The chasing scanning can be said to be a technique of scanning a plurality of frame data by shifting by a set interval. In this specification, each of the plurality of frames in the chase scanning is referred to as a subframe. The three-step overdrive technology uses three subframes: predrive, overdrive, and last drive.

  Such chasing scanning can increase the degree of freedom of the drive interval. However, in the prior art, when chasing scanning is applied to a display device that performs row inversion driving or dot inversion driving, the number of polarity inversions of the source bus is increased and the power consumption is increased as in the following example. May end up.

  FIG. 1 shows an example of a three-step overdrive technique. In FIG. 1, the gate drive timing, the source bus voltage waveform, and the source bus voltage polarity change over time are shown in order from top to bottom. In FIG. 1, a line period (line cycle time or line period) is a line driving period, and each line period is a time for driving one gate line GL.

  As shown in FIG. 1, the chasing scan performs pre-drive, overdrive, and last drive gate scans. In the illustrated example, the interval between the pre-drive and the overdrive is a three-line period, that is, a three-line interval (an interval corresponding to three lines). Similarly, the interval between the overdrive and the last drive is also an interval of 3 lines. Further, as shown in the figure, predrive, overdrive, and last drive are performed in the first 1/3 period, the middle 1/3 period, and the last 1/3 period of each line period, respectively. .

  When the chasing scan is performed, the polarity of the source bus voltage frequently changes as shown in the figure. Specifically, the polarity is inverted three times for each line period. For example, the polarity changes to +, −, + in the line period 1, and the polarity changes to −, +, − in the line period 2.

  Such frequent polarity reversal is caused by combining chasing scanning with row inversion driving or dot inversion driving. Referring to the lower polarity change in FIG. 1, in row inversion driving or dot inversion driving, the predrive polarity is inverted every line period. Similarly, the polarity of overdrive is also reversed every line period. Further, the polarity of the last drive is also inverted every line period. The overdrive polarity change deviates from the other two polarity changes. As a result of the combination, the polarity is inverted three times in one line period as shown in the figure.

  Such frequent polarity inversion leads to an increase in power consumption. Even when chasing scanning is performed in a row inversion driving or dot inversion driving display device, it is desirable to reduce power consumption as much as possible.

In the above description, the background of the present invention has been described by taking up the case of chasing scanning in the overdrive technology. However, it is not limited to overdrive, and a similar event can occur when chasing scanning is performed. Another example where chasing scanning is applied is black insertion. In black insertion, after writing the target voltage, a black level voltage for improving the response of the moving image is written to the pixel.
JP 2003-162256 A

The present invention has been made under the above background, and an object thereof is to provide a driving device and a driving method for a display device capable of reducing power consumption.
Another object of the present invention is to provide a driving device and a driving method for a display device capable of obtaining a high-quality image.

  One embodiment of the present invention is a device for driving a display device, which is a source driver that drives a plurality of source buses of the display device, and a gate driver that drives a plurality of gate lines of the display device, A gate driver that performs chasing scanning in which the gate driver performs row inversion driving or dot inversion driving on the display device together with a source driver, and scans a plurality of sub-frames constituting one frame by shifting by a predetermined interval And the total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of subframes is an odd number, and the interval of the chase scanning corresponds to an odd line interval. The polarity of each pixel is supported between a plurality of subframes that are written in order. And a control means for controlling the gate driver and the source driver to inverted every frame.

  According to the present invention, a plurality of source bus signals are sequentially supplied to each source bus in one line period. The plurality of source bus signals are respectively supplied to a plurality of lines (a plurality of pixels) shifted by the chase scanning interval. In the present invention, by adopting the above configuration, the voltage polarities of the plurality of source bus signals are the same in one line period. For example, when the present invention is applied to a three-step overdrive technique, predrive, overdrive, and last drive are performed on lines shifted by intervals in one line period. At this time, the voltage polarities of the three drives are the same in one line period. In this way, according to the present invention, the number of inversions of the source bus voltage can be reduced and the power consumption can be reduced.

  Another aspect of the present invention is a device for driving a display device, a source driver for driving a plurality of source buses of the display device, and a gate driver for driving a plurality of gate lines of the display device, Gate for performing follow-up scanning in which the gate driver and the source driver perform row inversion driving or dot inversion driving on the display device, and scan a plurality of subframes constituting one frame by shifting by a predetermined interval. The total scan period including the driver and vertical blanking of one screen corresponds to an odd line period, the number of subframes is an odd number, and the interval of the chasing scan corresponds to an even line interval. The polarity of each pixel is composed of a plurality of sub-frames written in order. And a control means for controlling the gate driver and the source driver so as not inverted every subframe, the.

  Another aspect of the present invention is a device for driving a display device, a source driver for driving a plurality of source buses of the display device, and a gate driver for driving a plurality of gate lines of the display device, Gate for performing follow-up scanning in which the gate driver and the source driver perform row inversion driving or dot inversion driving on the display device, and scan a plurality of subframes constituting one frame by shifting by a predetermined interval. The total scanning period including the driver and vertical blanking of one screen corresponds to an odd line period, the number of the subframes is an even number, and the interval of the chase scanning is an odd or even line interval. Each frame is composed of a plurality of subframes that are written in order. Comprising a control means for polarity controlling the gate driver and the source driver to not inverted for each sub-frame.

  Another aspect of the present invention is a device for driving a display device, a source driver for driving a plurality of source buses of the display device, and a gate driver for driving a plurality of gate lines of the display device, Gate for performing follow-up scanning in which the gate driver and the source driver perform row inversion driving or dot inversion driving on the display device, and scan a plurality of subframes constituting one frame by shifting by a predetermined interval. The total scanning period including the driver and vertical blanking of one screen corresponds to an odd line period, the number of the subframes is an even number, and the interval of the chase scanning is an odd or even line interval. Each frame is composed of a plurality of subframes that are written in order. The gate driver and the polarity of each pixel so that the polarity of each pixel is not inverted between the subframe written at the end of one frame and the subframe written at the beginning of the next frame. Control means for controlling the source driver.

  Another aspect of the present invention is a method of driving a display device, which drives a plurality of source buses of the display device, drives a plurality of gate lines of the display device, and the plurality of gate lines and the plurality of gate lines. The display device performs row inversion driving or dot inversion driving by driving the source bus, and performs chasing scanning in which a plurality of sub-frames constituting one frame are shifted by a predetermined interval to perform scanning. The total scanning period including vertical blanking is equivalent to an odd line period, the number of subframes is odd, the interval of the chase scanning is equivalent to an odd line interval, The display device is configured such that the polarity of each pixel is inverted for each subframe between a plurality of subframes that are configured in order and written in order. To control the drive.

  Another aspect of the present invention is a method of driving a display device, which drives a plurality of source buses of the display device, drives a plurality of gate lines of the display device, and the plurality of gate lines and the plurality of gate lines. The display device performs row inversion driving or dot inversion driving by driving the source bus, and performs chasing scanning in which a plurality of sub-frames constituting one frame are shifted by a predetermined interval to perform scanning. The total scanning period including vertical blanking is equivalent to an odd line period, the number of the subframes is odd, the interval of the chase scanning is equivalent to an even line interval, The display is configured so that the polarity of each pixel does not reverse every subframe between a plurality of subframes written in order. To control the drive of the location.

  Another aspect of the present invention is a method of driving a display device, which drives a plurality of source buses of the display device, drives a plurality of gate lines of the display device, and the plurality of gate lines and the plurality of gate lines. The display device performs row inversion driving or dot inversion driving by driving the source bus, and performs chasing scanning in which a plurality of sub-frames constituting one frame are shifted by a predetermined interval to perform scanning. The total scanning period including the vertical blanking of is equivalent to an odd line period, the number of the subframe is an even number, the interval of the chasing scan corresponds to an odd or even line interval, Configure one frame so that the polarity of each pixel does not reverse every subframe between multiple subframes written in order Controlling the driving of the display device.

  Another aspect of the present invention is a method of driving a display device, which drives a plurality of source buses of the display device, drives a plurality of gate lines of the display device, and the plurality of gate lines and the plurality of gate lines. The display device performs row inversion driving or dot inversion driving by driving the source bus, and performs chasing scanning in which a plurality of sub-frames constituting one frame are shifted by a predetermined interval to perform scanning. The total scanning period including the vertical blanking of is equivalent to an odd line period, the number of the subframe is an even number, the interval of the chasing scan corresponds to an odd or even line interval, Constituting one frame, the polarity of each pixel is reversed for each subframe between a plurality of subframes written in sequence, and One polarity of each pixel during the first subframe written of the last sub-frame and the next frame to be written in the frame to control the drive of the display device so as not inverted.

  Another embodiment of the present invention is an electronic device including a display device having the above-described driving device, and includes a mobile phone, a personal digital assistant (PDA), a notebook computer, a car navigation device, a television, and a digital still camera ( DSC) and an electronic device selected from the group consisting of liquid crystal display devices.

  The present invention can reduce power consumption when chasing scanning is performed in a row inversion driving type or dot inversion driving type display device.

  The detailed description of the present invention will be described below. However, the following detailed description and the accompanying drawings do not limit the invention. Instead, the scope of the invention is defined by the appended claims.

“First Embodiment”
FIG. 2 shows the configuration of the display device according to 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 driver circuit 5, a source driver circuit 7, and a control circuit 9. The drive device according to the present invention is provided in the display device 1, and specifically includes a gate driver circuit 5, a source driver circuit 7, and a control circuit 9.

  The display unit 3 includes a large number of gate lines GL and a large number of source buses SB intersecting with each other. Pixels are formed at the intersections of the large number of gate lines GL and the large number of source buses SB, whereby a large number of pixels are arranged in a matrix to form a display area. 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 SB, respectively.

  The gate driver circuit 5 is a circuit that sequentially drives a plurality of gate lines GL. The source driver circuit 7 is a circuit that drives each source bus by supplying a source bus voltage corresponding to an image to be displayed. The control circuit 9 controls the data driver circuit 5 and the gate driver circuit 7 according to the image data supplied from the CPU 11 to display an image on the display unit 3.

  In the above configuration, when one gate line GL is driven by the gate driver circuit 5 supplying a pulse signal, the transistor of each pixel located on the gate line GL is turned on. Then, the source driver circuit 7 supplies a source bus voltage to each pixel that is turned on through each source bus SB. Such an operation is sequentially performed on the plurality of gate lines GL by the gate driver circuit 5 and the source driver circuit 7 under the control of the control circuit 9. As a result, an image is displayed on the display unit 3.

  In the present embodiment, the driving device of the display device 1 is configured to perform row inversion driving or dot inversion driving. Inversion driving is performed by the gate driver circuit 5 and the source driver circuit 7 under the control of the control circuit 9. Referring to FIG. 3, in the row inversion driving, the polarity of the source bus voltage is inverted for each gate line GL (for each row). In the dot inversion drive, the polarity of the source bus voltage is inverted for each gate line GL (for each row) and for each source bus SB (for each column). Focusing on one source bus SB, the polarity of the source bus voltage is inverted for each gate line GL, that is, for each pixel, in both row inversion driving and dot inversion driving.

  In the present embodiment, the display device 1 and its driving device are configured to perform three-step overdrive by chasing scanning, as will be described in detail below. The chasing operation is performed by the gate driver circuit 5 and the source driver circuit 7 under the control of the control circuit 9.

  In the three-step overdrive, each pixel is sequentially driven with a predrive voltage, an overdrive voltage, and a last drive voltage. The last drive voltage is a signal corresponding to an image to be displayed and is also called a target voltage. The overdrive voltage is set to a predetermined value larger than the last drive voltage. The predrive voltage is set smaller than the overdrive voltage.

  In the above overdrive technology, each pixel needs to be driven three times in one screen. In the present embodiment, this multiple driving is realized by chasing scanning. In the follow-up scan, the next scan starts in the middle of each scan. That is, scanning with the predrive voltage is first performed, scanning with the overdrive voltage is performed after a predetermined interval from the scanning with the predrive voltage, and last scanning is performed with a predetermined interval after the scanning with the overdrive voltage. A drive voltage scan is performed. The interval is an interval (or period) corresponding to a predetermined number of lines.

  The chasing scan can be said to be a technique of scanning a plurality of frame data by shifting by an interval. Therefore, each of the plurality of frames is referred to as a subframe. In the three-step overdrive technology, scanning of three sub-frames of pre-drive, overdrive, and last drive is performed.

  However, if the chasing scan is simply performed, as shown in the example of FIG. 1 in the background art of the present invention, the number of polarity inversions of the source bus may increase and the power consumption may increase. In order to avoid such a situation, the drive device according to the present embodiment is configured to control the gate driver circuit 5 and the source driver circuit 7 to drive the display device 1 as described below. The number of voltage polarity reversals is reduced.

  As a first point, as shown in FIG. 4, in this embodiment, the total scanning period including the vertical blanking of one screen corresponds to an odd line period. That is, the total scanning period corresponds to an odd multiple of the line period. Each line period is a period for scanning one gate line GL.

  More specifically, as shown in FIG. 4, the total scanning period of one screen is the sum of the display area period and the vertical blanking period. The display area period is a scanning period of the display area, that is, corresponds to a line period of the number of horizontal scanning lines (number of gate lines). The number of horizontal scanning lines is generally an even number, and therefore the display region period corresponds to an even line period. On the other hand, the vertical blanking period is set to an odd line period. With this setting, the total scanning period becomes an odd line period, and the number of polarity inversions of the source bus in the total scanning period becomes an odd number.

  As a second point, as shown in FIG. 5, in this embodiment, the chase scanning interval corresponds to an odd line interval (or line period). Furthermore, as a third point, in the present embodiment, the polarity of the write voltage of each pixel is inverted for each subframe between a plurality of subframes that constitute one frame and are written in order.

  FIG. 5 shows the state of chasing scanning on one source bus SB over time. “P” in the figure indicates a pixel driven with a pre-drive voltage. Similarly, “O” and “L” indicate pixels driven by the overdrive voltage and the last drive voltage. “+” And “−” are writing polarities of the source bus voltage at the time of driving. As shown in the figure, in this embodiment, the interval between subframes corresponds to an odd line interval, and in the example shown in the figure, corresponds to a three line interval.

  Further, as shown in FIG. 5, in the same line n, the predrive voltage is “+”, the overdrive voltage is “−”, and the last drive voltage is “+”. In the next line n + 1, the predrive voltage is “−”, the overdrive voltage is “+”, and the last drive voltage is “−”. In this way, the polarity is inverted in the pre-drive, overdrive, and last drive, and therefore the polarity of each pixel is inverted every subframe.

  FIG. 5 shows the state of the chase scanning in one source bus SB. When row inversion driving is performed, chasing scanning is performed in the same manner on the adjacent source bus SB. When dot inversion driving is performed, the polarity of adjacent pixels is opposite in the adjacent source bus SB. However, the driving principle of the source bus SB is the same except for polarity inversion. Therefore, in the following description, the present invention will be described mainly focusing on one source bus SB as in FIG.

  Further, when the display device 1 is driven as described above, the polarity of one pixel is sequentially reversed in the predrive, overdrive, and last drive. This is not a problem in driving the display device 1. Since the liquid crystal molecules respond to the absolute value of the voltage difference, the response of the liquid crystal molecules is the same even if the polarity of the voltage difference is reversed.Therefore, even if the polarity is inverted every subframe, there is no adverse effect on the pixel operation. Absent. The present invention focuses on the properties of such liquid crystal molecules. The above drive control is performed in order to reduce the number of polarity inversions of the source bus without affecting the liquid crystal operation by utilizing this property.

  Next, the polarity inversion operation of the source bus voltage when the display device 1 is configured as described above will be described. FIG. 6 is a chart showing how the polarity of the source bus voltage changes during a total scanning period of one frame. Hereinafter, the chart in the form of FIG. 6 is referred to as a “polarity chart”. The polarity chart can also be called a polarity table.

  FIG. 6 shows a polarity chart of two frames (n frame and n + 1 frame). Each stage of the polarity chart corresponds to one line period. In each frame, as indicated by an arrow in a part of the polarity chart, the first stage pre-drive, overdrive, and last drive are sequentially performed. Subsequently, second-stage predrive, overdrive, and last drive are sequentially performed. This operation is continued, and the entire polarity chart (one frame) is scanned.

  As shown in FIG. 6, since the display device 1 performs row inversion driving or dot inversion driving, the polarity is inverted for each line.

  In the present embodiment, since the total scanning period of one frame is set to an odd line period, the number of chart stages (= total scanning period) is an odd number, specifically 13, in FIG. Also, vertical blanking (B) corresponds to an odd line period, specifically, one line period. In addition, continuous polarity inversion is performed during vertical blanking in order to prevent image quality deterioration. However, in FIG. 6, in order to simplify the description, the polarity chart is created with a smaller number of lines than the actual number (the same applies to the other polarity charts thereafter).

  Further, as indicated by a mark X in FIG. 6, the interval between subframes is set to an odd line interval, specifically, 5 line intervals (in the example of FIG. 5, the interval was 3 line intervals, FIG. 6 shows an example in which the interval is 5 line intervals).

  More specifically, when the pre-drive is viewed in the vertical direction, the lines 1, 2, 3,... Are sequentially driven from the start of one frame period. The drive of line 1 in overdrive is performed in the same line period as the drive of line 6 in predrive. As a result, each line is driven by overdrive with a delay of 5 lines from the predrive.

  Further, the driving of the line 1 in the last drive is performed in the same line period as the driving of the line 6 in the overdrive. As a result, each line is driven by the last drive with a delay of 5 lines further than the overdrive.

  In addition, as indicated by a mark Y in FIG. 6, the polarity of each pixel is inverted for each subframe between a plurality of subframes that constitute one frame and are sequentially written. For example, paying attention to line 1, in pre-driving, the pixels on line 1 are driven with “+”. In overdrive, the pixels in line 1 are driven with "-". Further, in the last drive, the pixels on the line 1 are driven with “+”. The same applies to the other lines, and the polarity of each pixel is inverted every subframe.

  Since row inversion driving or dot inversion driving is performed, the polarity is inverted in the upper and lower pixels as described above. Also, the polarity of each pixel is inverted for each frame. Accordingly, it is assumed that the polarity of predrive, overdrive, and last drive is “+, −, +” in one pixel in n frames. In this case, in the n + 1 frame, the polarities of predrive, overdrive, and last drive are “−, +, −” in the same pixel.

  In the present embodiment, display device 1 is driven as described above. As a result, as shown in FIG. 6, the polarity of the source bus SB is the same in each line period. Therefore, the number of polarity inversions of the source bus SB can be reduced.

  FIG. 7 shows the operation of the display device 1 in the present embodiment. FIG. 7 shows the operation of the display device 1 of the present invention in the same format as the prior art of FIG. In FIG. 7, the gate drive timing, the source bus voltage waveform, and the source bus voltage polarity change over time are shown in order from the top to the bottom. A line period (line cycle time or line period) is a period of line driving, and each line period is a time for driving one gate line GL.

  As shown in the gate drive timing chart, as the follow-up scanning, pre-drive, overdrive, and last drive scans are performed. In the example in the figure, the interval is 3 line intervals (in the example in FIG. 6, the interval between subframes was 5 line intervals, but FIG. 7 shows an example in which the interval is 3 line intervals to make the drawing easier to understand. ing). Further, as shown in the figure, predrive, overdrive, and last drive are performed in the first 1/3 period, the middle 1/3 period, and the last 1/3 period of each line period, respectively. .

  The timing of the follow-up scanning is the same in FIG. 1 of the prior art and FIG. 7 of the present embodiment. However, as can be seen from a comparison between FIG. 1 and FIG. 7, in the conventional technique, the polarity of the source bus voltage is inverted three times in one line period, but in this embodiment, the source bus voltage polarity is maintained the same in one line period. Is done.

  Such a difference is realized by the inversion of the source bus voltage polarity for each subframe described above. Line 1 is “+” for predrive, “−” for overdrive, and “+” for last drive. Line 2 is "-" for pre-drive, "+" for overdrive, and "-" for last drive. As a result of the polarity inversion for each source bus, the polarity of the source bus voltage is the same in each line period as shown in FIG.

  Next, the present embodiment and the prior art will be compared using a polarity chart. FIG. 8 is a polarity chart corresponding to the prior art of FIG. Also in the prior art, the total scanning period corresponds to an odd line period (13 line periods). The interval between subframes is an odd line interval (5 line interval).

  However, as a difference between the present embodiment and the prior art, in the prior art, polarity inversion for each subframe is not performed. In the n frame, line 1 is “+” for pre-drive, “+” for overdrive, and “+” for last drive. Line 2 is "-" for pre-drive, "-" for overdrive, and "-" for last drive. As a result, in FIG. 8, the polarity of the source bus voltage is inverted three times in each line period. On the other hand, in the present invention, as shown in FIG. 6, the number of polarity inversions of the source bus voltage can be greatly reduced.

  Further, as an additional advantage of the present embodiment, image quality can be improved as described below. FIG. 9 shows a polarity chart of another specification. Similar to the configuration of the present embodiment of FIG. 6, in FIG. 9, the interval between subframes is an odd line interval. In addition, as in the present embodiment, the polarity is inverted for each subframe.

  However, as a difference from the present embodiment, in FIG. 9, the blanking period is an even line period, and the total scanning period of one frame is also an even line period. As a result, as shown in the figure, in the first five line periods (from the first to the fifth), the polarities of the overdrive and the last drive are the same, and the polarities of the predrive are different. In the next five-line period (sixth to tenth), the predrive and overdrive have the same polarity and the last drive has a different polarity. Thus, the polarity pattern changes in the middle. Such discontinuity and non-uniformity of the pattern cause deterioration of image quality. According to the present invention, the polarity pattern is the same for all lines, and continuity of the pattern can be obtained, thereby avoiding image quality degradation as described above.

  The first embodiment of the present invention has been described above. As shown in the above-described example, in the display device driving device according to the present invention, the gate driver and the source driver perform row inversion driving or dot inversion driving on the display device and constitute one frame. A follow-up scan is performed in which a plurality of subframes are shifted by a predetermined interval. The driving device of the present invention controls the gate driver and the source driver. In this control, the total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of subframes is an odd number, and the follow-up scanning interval corresponds to an odd line interval. This is performed so that the polarity of each pixel is inverted for each subframe between a plurality of subframes that are configured in order and written in order.

  As described above, in the present invention, (1) the total scanning period including vertical blanking of one screen corresponds to an odd line period, and (2) the number of subframes is an odd number (the above example) (3), (3) the chasing scan interval corresponds to an odd line interval, and (4) each pixel has a polarity between a plurality of sub-frames that constitute one frame and are sequentially written. Invert every subframe. With such a configuration, a plurality of source bus signals respectively corresponding to a plurality of subframes are sequentially supplied to each source bus in one line period. The plurality of source bus signals are respectively supplied to a plurality of lines (a plurality of pixels) shifted by the chase scanning interval. In the present invention, the voltage polarities of the plurality of source bus signals are the same in one line period. Therefore, the number of inversions of the source bus voltage can be reduced to reduce power consumption.

  According to the present embodiment, the number of polarity inversions of the source bus signal or common electrode signal can be reduced, and the source signal or common signal generation circuit amplifier can be miniaturized. In addition, the continuity (uniformity) of the polarity inversion pattern of the source bus or common signal is maintained, so that deterioration in image quality can be avoided and good image quality can be obtained.

“Second Embodiment”
Next, a second embodiment of the present invention will be described. In the following, differences from the first embodiment will be mainly described, and description of matters common to the first embodiment will be omitted.

  In the present embodiment, the overall configuration of the display device and its driving device is the same as that of the first embodiment, as shown in FIG. Further, the first embodiment and the second embodiment are the same in the following points. That is, row inversion driving or dot inversion driving is performed. A three-step overdrive is performed by chasing scanning. A total scanning period including vertical blanking for one screen corresponds to an odd number of line periods.

  However, the difference between the first embodiment and the second embodiment is that, in the first embodiment, the interval between subframes corresponds to the odd line interval, whereas the second embodiment is different from the first embodiment. In this form, the interval between subframes corresponds to an even line interval. Further, in the first embodiment, the polarity of each pixel is inverted for each subframe between a plurality of subframes that constitute one frame and are sequentially written. However, in the second embodiment, polarity inversion for each subframe is not performed between a plurality of subframes that constitute one frame and are written in order.

  FIG. 10 shows a polarity chart corresponding to the display device of the present embodiment. As shown in the figure, in this embodiment, the interval between subframes is an even line interval, specifically, an interval of 4 lines.

  The polarity of the same line in the same frame is the same (not inverted) in the predrive, overdrive, and last drive. For example, looking at line 1 of n frames, the predrive is “+”, the overdrive (after 4 line periods) is “+”, and the last drive (after 4 line periods) is “+”. Similarly, regarding the line 2, the predrive is “−”, the overdrive is “−”, and the last drive is “−”.

  In the example of FIG. 10, the polarity of the source bus SB is the same in each line period. Therefore, the number of polarity inversions of the source bus SB can be reduced.

  As described above, according to the second embodiment of the present invention, the driving device of the display device is configured to perform row inversion driving or dot inversion driving, and a plurality of units constituting one frame. Follow-up scanning is performed in which the subframes are shifted by a predetermined interval. In the driving apparatus of the present invention, (1) the total scanning period including vertical blanking of one screen corresponds to an odd line period, (2) the number of subframes is an odd number, and (3) The follow-up scanning interval corresponds to an even line interval. (4) The polarity of each pixel is not inverted every subframe between a plurality of subframes that constitute one frame and are sequentially written. Even with such a configuration, the voltage polarities of a plurality of source bus signals are the same in one line period. As a result, the number of inversions of the source bus voltage can be reduced to reduce power consumption.

  Also in this embodiment, the continuity (uniformity) of the polarity pattern described in the first embodiment is maintained. Therefore, it is possible to avoid image quality deterioration and obtain good image quality.

“Third Embodiment”
Next, a third embodiment of the present invention will be described. In the following, differences from the first embodiment will be mainly described, and description of matters common to the first embodiment will be omitted.

  In the present embodiment, the overall configuration of the display device and its driving device is the same as that of the first embodiment, as shown in FIG. The first embodiment and the third embodiment are the same in the following points. That is, row inversion driving or dot inversion driving is performed. A total scanning period including vertical blanking for one screen corresponds to an odd number of line periods.

  However, as a difference between the first embodiment and the third embodiment, in the first embodiment, the three-step overdrive is performed by the chasing scan, whereas the third embodiment is different from the first embodiment. Then, two-step overdrive is performed by chasing scanning. More specifically, each pixel is driven with an overdrive voltage and then with a last drive voltage.

  In the first embodiment, the interval between subframes corresponds to an odd line interval. However, in the third embodiment, the interval between subframes is arbitrary, and may be an even line interval or an odd line interval.

  Further, in the first embodiment, the polarity of each pixel is inverted for each subframe between a plurality of subframes that constitute one frame and are sequentially written. On the other hand, in the third embodiment, polarity inversion for each subframe is not performed between a plurality of subframes constituting one frame and sequentially written.

  The display device and its driving device of the present embodiment are configured to satisfy the above conditions. In order to satisfy the above conditions, the two polarity charts of FIGS. 11 and 12 can be applied. Either of these two polarity charts may be applied.

  In FIG. 11, the total scanning period corresponds to an odd line period (13 lines). The number of subframes is an even number (two of overdrive and last drive). The interval of the chase scanning (overdrive and last drive) is an even line interval, specifically, an interval of 4 lines. For example, when line 1 is driven by the last drive, line 5 is driven by overdrive.

  The polarity of the same line in the same frame is the same (not reversed) in overdrive and last drive. For example, in the case of line 1 of n frames, the overdrive is also “+”, and the last drive (after 4 line periods) is “+”. Similarly, regarding the line 2, the overdrive is “−” and the last drive is “−”.

  Also in the example of FIG. 11, the polarity of the source bus SB is the same in each line period. Therefore, the number of polarity inversions of the source bus SB can be reduced.

  In FIG. 12, the interval between subframes is an odd line interval, specifically, a 5 line interval. For example, when line 1 is driven by the last drive, line 6 is driven by overdrive.

  The polarity of the same line in the same frame is the same (not reversed) in overdrive and last drive. For example, in the case of line 1 of n frames, the overdrive is also “+”, and the last drive (after 5 line periods) is “+”. Similarly, regarding the line 2, the overdrive is “−” and the last drive is “−”.

  In the example of FIG. 12, the polarity of the source bus voltage is inverted in each line period. However, the polarity in the second half of each line period is the same as the polarity in the first half of the next line period. Therefore, the number of times of polarity inversion can be suppressed to the same level as in the example of FIG.

  As described above, according to the third embodiment of the present invention, the driving device of the display device is configured to perform row inversion driving or dot inversion driving, and a plurality of units constituting one frame. Follow-up scanning is performed in which the subframes are shifted by a predetermined interval. In the driving device of the present invention, (1) the total scanning period including vertical blanking of one screen corresponds to an odd line period, and (2) the number of subframes is an even number (the above example) (2 steps), (3) the chasing scan interval corresponds to an odd or even line interval (arbitrary), and (4) a single frame consists of a plurality of subframes written in order. The polarity of each pixel is not reversed every subframe. Even with such a configuration, the number of inversions of the source bus voltage can be reduced, and the power consumption can be reduced.

  Also in this embodiment, the continuity (uniformity) of the polarity pattern described in the first embodiment is maintained. Therefore, it is possible to avoid image quality deterioration and obtain good image quality.

  In this embodiment, an overdrive voltage and a last drive voltage are supplied to each pixel in the two-step overdrive technology. In another example, the predrive voltage and the overdrive voltage may be supplied sequentially. The predrive voltage is set to a predetermined value smaller than the overdrive voltage. In this case, the overdrive voltage is controlled and supplied so that the necessary write voltage can be reached within the write time. Thereby, the voltage of each pixel becomes a value corresponding to the image to be displayed (a value lower than the overdrive voltage). This technology is also one of the two-step overdrive technologies. This also applies to the following fourth embodiment.

“Fourth Embodiment”
Next, a fourth embodiment of the present invention will be described. In the following description, differences from the first and third embodiments will be mainly described, and description of matters common to the first and third embodiments will be omitted.

  In the present embodiment, the overall configuration of the display device and its driving device is the same as that of the first embodiment, as shown in FIG. The third embodiment and the fourth embodiment are the same in the following points. That is, row inversion driving or dot inversion driving is performed. A total scanning period including vertical blanking for one screen corresponds to an odd number of line periods. Two-step overdrive is performed by chasing scanning. The interval between subframes is arbitrary, and may be an even line interval or an odd line interval.

  However, as a difference between the third embodiment and the fourth embodiment, in the third embodiment, the polarity of each pixel is comprised between a plurality of subframes that constitute one frame and are sequentially written. Was not inverted every subframe. On the other hand, in the fourth embodiment, the polarity of each pixel is inverted for each sub-frame between a plurality of sub-frames constituting one frame and sequentially written. Instead, in the fourth embodiment, polarity inversion for each subframe is not performed between consecutive separate frames. That is, the polarity of each pixel is not inverted between the last subframe of one frame and the first subframe of the next frame.

  The display device and its driving device of the present embodiment are configured to satisfy the above conditions. In order to satisfy the above conditions, the two polarity charts of FIGS. 13 and 14 are applicable. Either of these two polarity charts may be applied.

  In FIG. 13, as in FIG. 11, the total scanning period corresponds to an odd line period (13 lines). The number of subframes is an even number (two of overdrive and last drive). The interval of the chase scanning (overdrive and last drive) is an even line interval, specifically, an interval of 4 lines.

  However, as a difference between FIG. 13 and FIG. 11, in FIG. 11, the polarity of each pixel is the same between the overdrive and the last drive in one frame. On the other hand, in FIG. 13, between the overdrive and the subframe that constitute one frame (that is, between the subframe that constitutes one frame and is written first and the subframe that is written last). The polarity of each pixel is inverted. Instead, between the last drive making up one frame and the overdrive making up the next frame (i.e., the subframe written at the end of one frame and the subframe written at the beginning of the next frame) The polarity of each pixel is the same. Specifically, for line 1 of the n frame, the overdrive polarity is “+”, the last drive polarity is “−”, and in the n + 1 frame, the overdrive polarity is “−”, the last drive polarity. Is “+”. Therefore, the polarity is not reversed and maintained between the last drive of n frames and the overdrive of n + 1 frames.

  Thus, in FIG. 13, the polarity for each subframe is inverted, but the polarity is maintained between frames. The pattern of FIG. 11 can be expressed as “++ −−”, and the pattern of FIG. 13 can be expressed as “+ −− +”.

  The polarity chart of FIG. 13 has been described above. In the example of FIG. 13, as in the example of FIG. 12, the second half polarity of each line period is the same as the first half polarity of the next line period. Therefore, the number of polarity inversions can be suppressed to the same level as in the examples of FIGS.

  FIG. 14 can be said to be a modification of FIG. In FIG. 14, as in FIG. 12, the interval between subframes is an odd line interval, specifically, a 5-line interval.

  However, in FIG. 12, as in FIG. 11, the above-described “++ -−” pattern is adopted, and one frame is composed of a plurality of subframes written in order. Polarity inversion is not performed. On the other hand, in FIG. 14, the pattern of “+ −− +” is adopted as in FIG. The polarity inversion is performed for each subframe between a plurality of subframes written in order in one frame, but the last drive of one frame (ie, the subframe written at the end of one frame) And the polarity of the next frame overdrive (ie, the subframe written at the beginning of the next frame).

  As a result, in the example of FIG. 14, the polarity of the source bus SB is the same in each line period. Therefore, also in the example of FIG. 14, the number of polarity inversions of the source bus SB can be reduced.

  As described above, according to the fourth embodiment of the present invention, the driving device of the display device is configured to perform row inversion driving or dot inversion driving, and a plurality of units constituting one frame. Follow-up scanning is performed in which the subframes are shifted by a predetermined interval. In the driving device of the present invention, (1) the total scanning period including vertical blanking of one screen corresponds to an odd line period, and (2) the number of subframes is an even number (the above example) (2 steps), (3) the chasing scan interval corresponds to an odd or even line interval (arbitrary), and (4) a single frame consists of a plurality of subframes written in order. The polarity of each pixel is inverted every subframe, and the polarity of each pixel is not inverted between the subframe written at the end of one frame and the subframe written at the beginning of the next frame. Even with such a configuration, the number of inversions of the source bus voltage can be reduced, and the power consumption can be reduced.

  Also in this embodiment, the continuity (uniformity) of the polarity pattern described in the first embodiment is maintained. Therefore, it is possible to avoid image quality deterioration and obtain good image quality.

  The present invention is suitable for the overdrive technology as described in the first to fourth embodiments. However, the present invention need not be limited to overdrive technology. The present invention can be applied to a driving device of a display device in which row inversion driving or dot inversion driving is performed and chasing scanning is performed. For example, the present invention can also be applied to the case where follow-up scanning is used for a spare drive for other purposes. Another example where chasing scanning is applied is black insertion. Black insertion is a process of writing a black level voltage to a pixel for improving the response of a moving image after writing the target voltage. The same applies to the following other embodiments that the present invention is not limited to the overdrive technology.

"Gate Driver Configuration"
Next, a configuration of the gate driver circuit 5 suitable for driving the display device according to the present embodiment will be described. As described below, the gate driver circuit 5 can be considered to be either (1) performing block control or (2) not performing block control.

(1) When performing block control In this case, as shown in the example of FIG. 15, the gate driver circuit 5 includes a plurality of gate driver blocks. In FIG. 15, each gate driver block is an IC chip.

  Each gate driver block drives a block including a plurality of gate lines. In FIG. 15, three blocks A, B, and C are shown, and three IC chips are shown. In these three blocks A, B, and C, the start pulse STV is common. The start pulse STV is a trigger pulse for starting scanning, and is supplied from the control circuit to the blocks A, B, and C. Each block is connected by a delivery pulse signal line for maintaining continuity of operation. On the other hand, the enable signal is different in the three blocks A, B, and C. As shown in the figure, separate gate enable signals GOE1, GOE2, and GOE3 are supplied from the control circuit to the three blocks A, B, and C, and thus enable control is performed for each block.

  The number of lines in each block is set to the number of lines corresponding to the chase scanning interval. If the chase scanning interval is n line intervals, the number of lines in the block is also n.

  As shown in the above example, in the present invention, the gate driver circuit 5 is composed of a plurality of gate driver blocks, and each gate driver block drives a plurality of gate lines GL. The plurality of gate driver blocks are controlled by separate enable signals, whereby enable control is performed for each gate driver block.

  Further, according to the present invention, when the scanning of the last subframe constituting one frame starts at the boundary of the gate driver block, the scanning position of one or more subframes other than the last subframe and one or more blocks The boundaries are set so as to match each other. In the above example, the number of lines in each block is set to be equal to the number of lines in the interval, so that the boundary of the gate driver block is provided for each number of lines in the interval, and the boundary setting that satisfies the above requirements is established. It has been realized.

  The above boundary setting will be described in more detail. When a follow-up scan is performed using a plurality of subframes, when the scan of the last subframe is started, the scan of the other subframe is already performed first by the number of lines corresponding to the interval. Progressing. In this embodiment, as described above, when scanning of the last subframe configuring one frame is started, the scanning position of one or more subframes other than the last subframe and one or more block boundaries are Block boundaries are set to match each other. More specifically, when the first line in the last subframe is scanned, the block boundary is set so as to coincide with the boundary between the scanning line of the other subframe and the line immediately preceding it. For example, in a display device that performs two-step overdrive, assume that the interval is an n-line interval. In this case, a block boundary is set between the nth line and the (n + 1) th line. In the case of 3 steps, a block boundary is further set between the 2nth line and the 2n + 1th line.

  Within the scope of the present invention, the above requirements (when scanning of the last subframe constituting one frame is started, scanning positions of one or more subframes other than the last subframe and one or more block boundaries are performed. The positions of the other block boundaries are arbitrary. More block boundaries may be provided. For example, as a modification of FIG. 15, the number of lines in each block may be set to half, and each block may be further divided into two.

  FIG. 16 shows another configuration example of the gate driver circuit. In this example, the gate driver circuit is formed with a display unit on a glass substrate, and is, for example, an LTPS (low temperature polysilicon) circuit or an a-Si (amorphous silicon) circuit formed in a glass substrate shape, or a gate. The driver circuit is a one-chip IC circuit. The gate driver circuit is composed of a plurality of functional blocks, and each functional block has the function of a gate driver block, like the driver IC of FIG.

  FIG. 17 shows an operation example when the above block control is performed. The start pulse STV and the gate clock GLK are common to all the blocks A, B, and C. A pulse P is generated according to these signals STV and GLK. In each block, the pulse P is combined with the gate enable signal, and as a result, each line is driven in the shaded portion of each pulse P as shown in the figure.

  Here, as illustrated, the gate enable signals GOE1, GOE2, and GOE3 supplied to the blocks A, B, and C are shifted from each other. As a result, the chase scanning in which the pre-drive, the overdrive, and the last drive are sequentially performed with the drive timing shifted by the blocks is preferably realized.

  FIG. 18 shows another example of operation when block control is performed. Also in this example, enable control is individually performed for each block, and as a result, follow-up scanning in which predrive, overdrive, and last drive are sequentially performed is suitably realized.

  In the example of FIG. 18, in the block A, predrive, overdrive, and last drive are all performed in the first 1/3 period of one line period. Similarly, in the block B, all three drives are performed in the middle １ ／ period of one line period. Further, in block C, all three drives are performed in the last 1/3 period of one line period.

  As described above, in this embodiment, the gate driver circuit includes a plurality of gate driver blocks, each gate driver block drives a plurality of gate lines, and the plurality of gate driver blocks are controlled by separate enable signals, Furthermore, the gate driver block boundary coincides with the scanning position of one or more subframes other than the last subframe and the one or more block boundaries when scanning of the last subframe constituting one frame is started. It is set to be.

  As described above, in the present embodiment, when the chase scanning is performed by the block control, the block boundary is appropriately set, and when the scanning of the last subframe constituting one frame is started, The boundary between the scanning position of the other subframe and the position immediately before it coincides with the boundary of the gate driver block. With such a configuration, each block can be controlled with one enable signal.

(2) Case where Block Control is not Performed Next, a case where the above-described enable control for each block by the gate driver block is not performed will be described.

  FIG. 19 shows a configuration example of the gate driver circuit 5. In the example of FIG. 19, the gate line is divided into three groups A, B, and C. All the gate lines of these groups A, B, and C are controlled by one gate driver circuit. The gate driver circuit may be an IC chip. The gate driver circuit may be a circuit such as LTPS or a-Si formed on glass. The gate driver circuit drives the groups A, B, and C using the start pulse STV input from the control circuit and the gate enable signals GOE1, GOE2, and GOE3.

  In the above-described embodiment, one enable signal is used for each block. Such block control is not performed in the configuration of FIG. In FIG. 19, one gate driver circuit drives all groups A, B, C using all enable signals GOE1, GOE2, GOE3 (each group is driven using all enable signals). ).

  As a suitable condition for performing the control of the present embodiment, the number of gate enable phases is set to be equal to or greater than the number of subframes. Specifically, when performing 3-step overdrive, the number of subframes is 3, and the number of gate enable phases is set to 3 or more.

  In the present embodiment, the interrupt phase between subframes is assigned to a different enable phase for each interval. For example, if the interrupt phase at the start of one interval is assigned to one gate enable phase, the interrupt phase at the start of the next interval is assigned to another gate enable phase, and the next interrupt phase is also enabled to another Assigned to a phase.

  Further, in the case of realizing the present embodiment, as a circuit configuration of the gate driver, an n-phase circuit using a control signal such as a clock or enable of at least two phases or more is repeated. The total circuit is preferably set to an integral multiple of the repetitive circuit.

  In this embodiment, it is preferable to set the unit of the repetitive circuit to an odd line. More specifically, in the present embodiment, the total scanning period including vertical blanking corresponds to odd lines. In order to conform to such a total scanning period corresponding to odd lines, it is required that one unit of repeating circuit has a configuration corresponding to odd lines.

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

  FIG. 20 shows the enable signals GOE1, GOE2, and GOE3 for each group and the enable signals GOE1, GOE2, and GOE3 synthesized from the three groups. The synthesized enable signals GOE1, GOE2, and GOE3 in the figure are supplied from the control circuit to the gate driver circuit (IC chip in FIG. 19). The combined enable signals GOE1, GOE2, and GOE3 are distributed for driving the groups A, B, and C as shown in FIG.

  In FIG. 20, intervals 1, 2, and 3 correspond to chasing scan intervals. At the start of interval 1, the pulse of enable signal GOE1 is located. Therefore, in the interval 1, the interrupt phase of the subframe is given to the enable signal GOE1. Similarly, in the interval 2, the interrupt phase of the subframe is assigned to the enable signal GOE3. Furthermore, in the interval 3, the interrupt signal of the subframe is assigned to the enable signal GOE2.

  In this manner, in FIG. 20, the interrupt phase between subframes is assigned to an enable phase that is different for each interval. As a result, as shown in FIG. 21, the sub-frames of the pre-drive, overdrive, and last drive are scanned while being shifted by an interval, and the follow-up scan is preferably realized.

  FIG. 22 shows another operation example of the display device. This example corresponds to the case where the number of lines in each group is “3n + 1” (n is a positive integer). Also in this example, the interrupt phase between subframes is assigned to a different enable phase every interval. Then, as shown in FIG. 21, chasing scanning of three subframes is preferably realized.

  As described above, according to the present embodiment, chasing scanning can be realized without performing enable control for each block. The interval phase for the repetitive circuit can be fixed, the degree of freedom in timing design is great, and the optimum timing can be selected from the viewpoint of image quality. In addition, the continuity of the source bus and the common signal can be maintained, and deterioration in image quality can be avoided.

  Further, the above-described embodiment is a display device including a driving device. The present invention is not limited to the driving device. Another embodiment of the present invention is a display device, for example. Another embodiment of the present invention is an electronic device including a display device including the above driving device. The electronic device may be an electronic device selected from the group consisting of a mobile phone, a personal digital assistant (PDA), a notebook personal computer, a car navigation device, a television, a digital still camera (DSC), and a liquid crystal display device.

  Although the presently preferred embodiments of the present invention have been described above, it will be understood that various modifications can be made to the present embodiments and are within the true spirit and scope of the present invention. It is intended that the appended claims include all such variations.

  The display device according to the present invention is useful as a display for computers and other electronic devices.

It is a figure which shows the example in which the chase scanning was applied to the overdrive technique in the conventional display apparatus. It is a figure which shows the display apparatus in the 1st Embodiment of this invention. It is a figure which shows row inversion drive and dot inversion drive. It is a figure which shows the total scanning period including the vertical blanking of 1 screen. It is a figure which shows the chase scanning of this Embodiment. It is a figure which shows the polarity chart showing the mode of the polarity change of the source bus | bath in the total scanning period of 1 frame in the case of performing the chase scanning of this invention. 6 is a timing chart illustrating the operation of the display device of the present embodiment. It is a figure which shows the polarity chart corresponding to the drive technique of the display apparatus in a prior art. It is a figure which shows the example of a polarity chart in case the block-shaped image quality degradation by non-continuation of a polarity change pattern and nonuniformity arises. It is a figure which shows the polarity chart in the case of driving the display apparatus which concerns on 2nd Embodiment. It is a figure which shows the 1st example of the polarity chart in 3rd Embodiment. It is a figure which shows the 2nd example of the polarity chart in 3rd Embodiment. It is a figure which shows the 1st example of the polarity chart in 4th Embodiment. It is a figure which shows the 2nd example of the polarity chart in 4th Embodiment. It is a figure which shows the example of the gate driver circuit in the case of performing enable control for every block. It is a figure which shows the example of the gate driver circuit in the case of performing enable control for every block. It is a figure which shows the operation example of the display apparatus in the case of performing enable control for every block. It is a figure which shows the operation example of the display apparatus in the case of performing enable control for every block. It is a figure which shows the example of the gate driver circuit when not performing the enable control for every block. It is a figure which shows the operation example of the display apparatus when not performing the enable control for every block. It is a figure which shows the operation example of the display apparatus when not performing the enable control for every block. It is a figure which shows the operation example of the display apparatus when not performing the enable control for every block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 3 Display part 5 Gate driver circuit 7 Source driver circuit 9 Control circuit GL Gate line SB Source bus

Claims (9)

A driving device for driving a display device,
A source driver for driving a plurality of source buses of the display device;
A gate driver for driving a plurality of gate lines of the display device, wherein the gate driver performs row inversion driving or dot inversion driving with respect to the display device together with the source driver, and constitutes one frame A gate driver that performs chasing scanning that scans by shifting the subframe by a predetermined interval;
A total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of subframes is an odd number, and the interval of the chase scanning corresponds to an even line interval; The gate driver and the gate driver are arranged so that the polarity of each pixel is not inverted for each subframe between a plurality of subframes written in order, and the polarity of the source bus voltage is not continuously inverted. Control means for controlling the source driver;
A drive device for a display device, comprising: A driving device for driving a display device,
A source driver for driving a plurality of source buses of the display device;
A gate driver for driving a plurality of gate lines of the display device, wherein the gate driver performs row inversion driving or dot inversion driving with respect to the display device together with the source driver, and constitutes one frame A gate driver that performs chasing scanning that scans by shifting the subframe by a predetermined interval;
The total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of the subframes is an even number, and the interval of the follow-up scanning corresponds to an odd or even line interval. The gate is configured so that the polarity of each pixel does not invert every subframe and the polarity of the source bus voltage does not invert continuously between a plurality of subframes written in order. A control means for controlling the driver and the source driver;
A drive device for a display device, comprising: The gate driver circuit includes a plurality of gate driver blocks, each gate driver block drives a plurality of gate lines, the plurality of gate driver blocks are controlled by separate enable signals, and the boundary of the gate driver block is one The scanning position of one or more subframes other than the last subframe is set to coincide with one or more block boundaries when scanning of the last subframe constituting the frame is started. The drive device for a display device according to claim 1 or 2 . Claim is set to equal to or greater than the number of sub-frames numbers are chasing scanning gate enable phase in the gate driver circuit, it interrupts the phase between the sub-frame is equal to or assigned to a different enable phase for each interval 1 Or the drive device of the display apparatus of 2 . A driving method for driving a display device,
Driving a plurality of source buses of the display device;
A plurality of gate lines of the display device are driven, row inversion driving or dot inversion driving is performed on the display device by driving the plurality of gate lines and the plurality of source buses, and constitutes one frame Follow-up scanning that scans a plurality of subframes by shifting by a predetermined interval,
A total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of subframes is an odd number, and the interval of the chase scanning corresponds to an even line interval; The display device is configured so that the polarity of each pixel is not inverted for each subframe between a plurality of subframes written in order, and the polarity of the source bus voltage is not continuously inverted. Control the drive,
A driving method of a display device. A driving method for driving a display device,
Driving a plurality of source buses of the display device;
A plurality of gate lines of the display device are driven, row inversion driving or dot inversion driving is performed on the display device by driving the plurality of gate lines and the plurality of source buses, and constitutes one frame Follow-up scanning that scans a plurality of subframes by shifting by a predetermined interval,
The total scanning period including vertical blanking of one screen corresponds to an odd line period, the number of the subframes is an even number, and the interval of the follow-up scanning corresponds to an odd or even line interval. The display is made so that the polarity of each pixel does not invert every subframe and the polarity of the source bus voltage does not invert continuously between a plurality of subframes written in order. Control the drive of the device,
A driving method of a display device. Each of a plurality of gate driver blocks of the gate driver circuit drives a plurality of gate lines, the plurality of gate driver blocks are controlled by separate enable signals, and the boundary of the gate driver block is the last constituting one frame. claim scanning of the sub-frame when it is started, wherein said final scan position and one or more block boundaries of one or more sub-frames other than the sub-frame is set to match each 5 Or a driving method of the display device according to 6 ; Claim is set to equal to or greater than the number of sub-frames numbers are chasing scanning gate enable phase in the gate driver circuit, it interrupts the phase between the sub-frame is equal to or assigned to a different enable phase for each interval 5 Or a driving method of the display device according to 6 ; An electronic device having a display device having the driving device according to claim 1 , comprising a mobile phone, a personal digital assistant (PDA), a notebook computer, a car navigation device, a television, a digital still camera (DSC). And an electronic device selected from the group consisting of liquid crystal display devices.

Images