TWI537908B - A driving method and a display panel using the method - Google Patents

Description

Driving method and display device using the same

The present invention relates to a driving method, and more particularly to a driving method of a display panel and a display device using the same.

In a thin film transistor liquid crystal display, the display of an image controls the twist angle or arrangement by changing the voltage applied to each pixel to change the electric field on both sides of the liquid crystal molecular layer corresponding to the pixel region, thereby controlling the light. The throughput is achieved. The liquid crystal molecules have such a characteristic that if the direction of the electric field applied to both sides of the liquid crystal layer remains unchanged for a long time, the physical properties of the liquid crystal molecules may be destroyed or residual charges may be distributed therein, that is, according to the change of the electric field. To do the corresponding rotation in the past. Therefore, the direction of the electric field applied to both sides of the liquid crystal layer must be changed at regular intervals so that the liquid crystal molecules are alternately deflected in opposite directions to prevent the physical properties from being destroyed. Currently common inversion drive modes are: Frame Inversion mode, Column Inversion mode, Line/Row Inversion mode, and Dot Inversion. Mode, etc.

The first to fourth figures respectively show the polarity of the voltage difference between the source output signal and the corresponding pixel in three consecutive frames in the four driving modes. In the four drive modes, the polarity of the sub-pixel's voltage difference changes from positive (+) to negative (-) or negative (-) to positive (+) whenever the frame changes. In the first to fourth figures, only three adjacent frames are shown.

As shown in Figure 1, in the frame inversion mode, the voltage polarities of all the pixels in the panel are the same, not positive or negative. If the voltage polarity of all sub-pixels in the first frame is positive, then change to negative in the second frame and then change to positive in the third frame.

As shown in Fig. 2, in the line inversion mode, the polarity of the voltage difference of all the sub-pixels in the same row is the same (not positive or negative), but is inverted in the next line. For example, in the first frame, the polarity of the voltage difference of all sub-pixels in row (1) is positive, and the polarity of the voltage difference of all sub-pixels in row (2) is negative. The polarity of all sub-pixels in (3) is positive. When the frame is changed to the second frame, the polarities of all the sub-pixels in row (1) are inverted to negative, and the polarities of all the sub-pixels in row (2) are inverted to positive, and the row ( The polarity of all sub-pixels in 3) is negative. When the frame is changed to the third frame, the polarity of all the sub-pixels in the row (1) is changed to positive again, and the polarity of all the sub-pixels in the row (2) is changed again to negative, and the row (3) The polarity of all the sub-pixels in the middle changes again to positive.

As shown in Figure 3, in the column inversion mode, all sub-pixels in the same column have the same polarity (not positive or negative), but are inverted in the next column. For example, in the first frame, all sub-pixels in column (1) have positive polarities, all sub-pixels in column (2) have negative polarities, and columns (3) All subpixels are positive. When the frame is changed to the second frame, the polarities of all the sub-pixels in the column (1) are inverted to be negative, and the polarities of all the sub-pixels in the column (2) are inverted to be positive, and the columns are inverted. The polarity of all sub-pixels in (3) is reversed to negative. When the frame is changed to the third frame, the polarity of all the sub-pixels in the column (1) is changed to positive again, and the polarity of all the sub-pixels in the column (2) is again changed to negative, and the column ( The polarity of all subpixels in 3) changes again to positive.

As shown in Fig. 4, in the dot inversion mode, the polarities of any adjacent sub-pixels are different from each other. For example, in the first frame, the sub-pixel polarity at the intersection of row (1) and column (1) is positive, but at the intersection of its adjacent sub-pixel row (1) and column (2) The sub-pixel polarity and the sub-pixel polarity at the intersection of row (2) and column (1) are both negative. When the frame is changed to the second frame, the sub-pixel polarity at the intersection of the row (1) and the column (1) is inverted to be negative, and the adjacent sub-pixel rows (1) and the column (2) are crossed. The sub-pixel polarity at the position and the sub-pixel polarity at the intersection of the row (2) and the column (1) are reversed to be positive. When the frame is changed to the third frame, the sub-pixel polarity at the intersection of the row (1) and the column (1) is changed to positive again, and its adjacent sub-pixel rows (1) and columns (2) The sub-pixel polarity at the intersection position, and the sub-pixel polarity at the intersection of the line (2) and the column (1) are again changed to negative.

In the above four inversion modes, if the polarity of a sub-pixel in the first frame is positive, then the second frame needs to be changed to negative, and then in the third frame. Again changing again, such a large source drive voltage switching will result in large power consumption, and now the display, in the case of a liquid crystal display, has an update rate of about 60 frames per second (or 75 frames per second), for Such a high update rate results in a lot of unnecessary power consumption in terms of displaying only static pictures.

Therefore, how to reduce the power consumption when driving the liquid crystal display becomes the target of the device.

SUMMARY OF THE INVENTION One object of the present invention is to provide a display driving method for a display, particularly a liquid crystal display, which reduces power consumption by reducing the number of times of alternating voltage differentials in opposite polarity directions.

Another object of the present invention is to provide a display driving method, and to increase the period of stopping the scanning signal and the data signal sending time in addition to a frame time, and in conjunction with stopping the supply or lowering or sleeping the gate driver or/and The source driver drives the voltage or current to reduce power consumption. The method can further reduce the update rate of the display and the liquid crystal display.

Another object of the present invention is to provide a driving method for a display and a liquid crystal display, and at the same time, reduce the driving power of the source driver to reduce power consumption in a frame time. This method can further reduce the liquid crystal display update rate.

According to an aspect of the present invention, a driving method is provided for driving a display driving device, wherein the display driving device includes at least a first driving circuit, a second driving circuit, and a plurality of first signal lines coupled The first driving circuit and the plurality of second signal lines are coupled to the second driving circuit, wherein the plurality of first signal lines cross the second signal lines and form a plurality of pixels at the intersection to form a a pixel matrix, the method comprising: applying a video signal having a polarity signal to the pixel matrix, wherein the polarity signal is a first polarity signal or a second polarity signal having opposite polarities; and causing at least one pixel in the pixel matrix The applied polarity signal remains unchanged for at least two consecutive frames.

In an embodiment, the method further comprises maintaining the polarity signal applied by at least one column of pixels in the pixel matrix for at least two consecutive frames.

In an embodiment, the method further includes maintaining the polarity signal applied by at least one pixel or at least one column of the pixel matrix for at least six consecutive frames.

In an embodiment, the polarity signal is a voltage signal or a current signal.

In an embodiment, the method further includes applying the polarity signal to a portion of the pixel matrix in a first time interval in a frame; and stopping applying the polarity signal in a second time interval of the frame. Or apply a sleep signal, a stationary signal.

In an embodiment, the second driving circuit selects part or all of the pixel matrix through the second signal lines, and the portion selected by the first driving circuit through the first signal line pairs or The image signal of the polarity signal is applied to all pixel matrices.

In an embodiment, wherein the second driving circuit or the first driving circuit is stopped or reduced in supply current or voltage during the second time interval in the frame.

In an embodiment, the power required by the first driving circuit or the second driving circuit in the second time interval is smaller than the first driving circuit or the second driving circuit in the first time interval. The required power.

In an embodiment, the average power consumed by the first driving circuit or the second driving circuit in the second time interval is smaller than the first driving circuit or/and the second driving circuit in the first time. The average power consumed in the interval.

In an embodiment, the frame may have a plurality of first time intervals or a plurality of second time intervals.

In an embodiment, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.3.

In one embodiment, applying a voltage signal to the pixel matrix further includes: dividing the pixel matrix into a plurality of regions; applying a polarity signal to the regions in a plurality of time intervals in a frame; and In the remaining time interval of the frame, the polarity signal is stopped or a sleep signal and a still signal are applied to the regions.

In one embodiment, applying a polarity signal to the pixel matrix further includes: applying the first polarity signal to the at least two adjacent rows, any two adjacent columns, or any two adjacent pixels of the pixel matrix The second polarity signal.

In an embodiment, applying a polarity signal to the pixel matrix further comprises: applying the first polarity signal or the second polarity signal to all pixels of the pixel matrix.

In an embodiment, applying a polarity signal to the pixel matrix further includes: simultaneously applying the first polarity signal or the at least two adjacent rows, at least two adjacent columns, or at least two adjacent pixels of the pixel matrix Bipolar signal.

In one embodiment, the display driving device includes at least two or more thin film transistor switches, one double gate thin film transistor, and one lightly doped thin film transistor corresponding to each pixel unit.

In one embodiment, one gate unit corresponding to each pixel unit in the display driving device is an amorphous germanium thin film transistor and an oxide thin film transistor (Oxide TFT).

In an embodiment, the display driving device is cut at a first frequency. When the frame is changed, the second driving circuit drives the scanning lines at a second frequency, wherein the second frequency is greater than the first frequency.

In one embodiment, the display driving device is a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, a germanium based micro display, an active matrix or Semiconductor germanium wafer matrix.

According to another aspect of the present invention, a display driving device is provided, wherein the display driving device includes at least a timing controller and a driving integrated circuit for performing the driving method described above. The display driving device can be a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, a germanium based microdisplay, an active matrix or a semiconductor germanium wafer matrix. .

According to another aspect of the present invention, a driving method is provided for driving a display driving device, wherein the display driving device includes at least a first driving circuit, a second driving circuit, and a plurality of first signal line couplings. Connected to the first driving circuit, and the plurality of second signal lines are coupled to the second driving circuit, wherein the plurality of first signal lines cross the second signal lines and form a plurality of pixels at the intersection to form a pixel matrix, the method comprising: at least one of the first time intervals in a frame, applying an image signal to a portion of the pixel matrix; and stopping applying the image signal in a second time interval of the frame , or apply a sleep signal or apply a stationary signal.

In an embodiment, the frame may have a plurality of first time intervals, or a plurality of second time intervals.

In an embodiment, the second driving circuit selects part or all of the pixel matrix through the second signal lines, and selects part or all of the first signal lines through the first signal lines. The image matrix is applied to the pixel matrix.

In an embodiment, the second driving circuit and or the first driving circuit are stopped or reduced in supply current or voltage during the second time interval in the frame.

In an embodiment, the second time zone may be a sleep time or a stationary time of the first driving circuit or the second driving circuit.

In an embodiment, the first driving circuit or the second driving circuit requires less power in the second time interval than the first driving circuit or the second driving circuit in the first time interval. The power required.

In an embodiment, the average power consumed by the first driving circuit or the second driving circuit in the second time interval is smaller than the first driving circuit or/and the second driving circuit in the first time interval. The average power consumed internally.

In an embodiment, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.3.

In an embodiment, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.6.

In one embodiment, a polarity signal is applied to the pixel matrix, wherein the polarity signal is a first polarity signal or a second polarity signal of opposite polarity; and the polarity signal is applied by at least one pixel in the pixel matrix. Maintain at least two consecutive frames unchanged.

In an embodiment, when the image signal of the pixel matrix switches the polarity of the polarity signal at a first frequency, the second driving circuit drives the scan lines at a second frequency, wherein the The second frequency is greater than the first frequency.

In an embodiment, the first frequency is 0.1 to 30 Hz, and the second frequency is 40 to 200 Hz.

In one embodiment, the display driving device includes at least two or more thin film transistor switches, a double gate thin film transistor, and a lightly doped thin film transistor corresponding to each of the pixel units.

In one embodiment, the second driving circuit corresponding to one of each of the pixel units in the display driving device is an amorphous germanium thin film transistor and an oxide thin film transistor (Oxide TFT).

In one embodiment, the display driving device is a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, a germanium based micro display, and an active Matrix or semiconductor germanium wafer matrix.

According to another aspect of the present invention, a display driving device is provided, wherein the display driving device includes at least a timing controller and a driving integrated circuit for performing the driving method described above. The display driving device can be a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, a germanium based microdisplay, an active matrix or a semiconductor germanium wafer matrix. .

In summary, in order to reduce the power consumption of the overall liquid crystal display, the liquid crystal display driving method of the present invention, in addition to reducing the number of times the liquid crystal molecules are alternately deflected in opposite directions when the frame is switched, The time of the frame is further divided into: a driving period of the gate driver and the source driver, and a sleep period or a stationary period of the gate driver and the source driver, wherein the source driver drives the scan line only in the gate driver The data signal is sent out during the time period, and the data signal is not supplied to the data line during the period when the gate driver does not drive the scan line, so the supply voltage or the drive current of the source driver and the gate driver can be stopped or reduced. In this way, the purpose of double reducing power consumption is achieved.

In order to reduce the power consumption of the overall liquid crystal display, the liquid crystal display driving method of the present invention, in addition to reducing the number of times the liquid crystal molecules are alternately deflected in the opposite direction when the frame is switched, is further re-zoned by displaying the time of the frame. Divided into: the driving period of the gate driver and the source driver, and the sleep period or the stationary period of the gate driver and the source driver, wherein the source driver sends the data signal only during the period in which the gate driver drives the scan line In the period when the gate driver does not drive the scan line, the supply of the data signal to the data line is also stopped, so that the supply voltage of the source driver and the gate driver can be stopped or reduced, thereby achieving double power consumption reduction. purpose.

In addition, dynamic images (such as movies, animations, moving pictures, etc.), static slow images (such as eco photography, page flip ads, etc.) or static image retention (such as pictures, photos, static print ads, text, etc.) can be applied. The liquid crystal display driving method described above is invented for display.

The application of the present invention will be described below by way of several embodiments, in which the technique of reducing the power consumption by reducing the number of times the liquid crystal molecules are alternately deflected in the opposite direction when the frame is switched is first described, and then by distinguishing a frame time Technology to reduce power consumption. The following is a frame inversion mode to explain the technical feature of the present invention to reduce the number of times the liquid crystal molecules are alternately deflected in opposite directions. However, the above application can also be used in the column inversion mode. Line/Row Inversion mode and Dot Inversion mode.

Please refer to FIG. 5, which is a schematic diagram showing the driving waveform of a certain pixel in an adjacent frame when the conventional display and the liquid crystal display are driven by the fixed common electrode voltage. In an ideal situation, the voltage waveform 501 of the common electrode is kept stationary, and the voltage waveforms 502, 503, and 504 of the pixel electrode are constantly changing up and down, wherein the voltage waveforms 502, 503, and 504 respectively represent the driving required for different gray levels. The voltage magnitude is called positive polarity when the voltage value of the pixel electrode is higher than the voltage value of the common electrode, so that the voltage difference formed by the voltage of the pixel electrode minus the voltage of the common electrode is positive; when the voltage value of the common electrode is high When the voltage value of the pixel electrode is such that the voltage difference between the voltage of the pixel electrode minus the voltage of the common electrode is negative, it is called negative polarity. Taking the voltage waveform 502 as an example, in a certain fixed gray scale, in different frames, the voltages at the liquid crystal (CLC) are positive for one time and negative for one time.

FIG. 6A is a schematic diagram showing driving waveforms of a certain pixel in an adjacent frame when the liquid crystal display is driven by using a fixed common electrode voltage according to an embodiment of the invention. The voltage waveform 501 of the common electrode is kept stationary, and the voltage waveforms 502, 503, and 504 of the pixel electrode are constantly changing up and down, wherein the voltage waveforms 502, 503, and 504 respectively indicate the driving voltages required for different gray levels. The voltage value of the pixel electrode is higher than the voltage value of the common electrode 501, so that the voltage difference formed by the voltage of the pixel electrode minus the voltage of the common electrode is positive, and the voltage value 501 of the common electrode is higher than that of the picture. The voltage value of the element electrode is called negative polarity when the voltage difference between the voltage of the pixel electrode minus the voltage of the common electrode is negative. Wherein, according to the present invention, in at least two adjacent frames, the frame N (Frame N) and the frame N+1 (Frame N+1) are located in a liquid crystal (Liquid Crystal, LC) in the case of a fixed gray scale. The voltage at both ends is negative, in the next two frames, frame N+2 (Frame N+2) and frame N+3 (Frame N+3), in a fixed gray level In this case, the voltage across the liquid crystal capacitor is positive.

Referring to FIG. 6B, when the driving method described above is applied to a display or a liquid crystal display for multi-frame inversion driving according to an embodiment of the present invention, the panel pixels are adjacent to three. The polarity of the frame is shown. In the Nth frame, the voltage difference between the pixel electrode and the common electrode of all sub-pixels in the panel is negative, that is, the voltage value of the common electrode is kept higher than the voltage value of the pixel electrode. When the frame is changed to the N+1th frame, the voltage difference between the pixel electrode and the common electrode of all the sub-pixels in the panel remains negative, that is, the voltage of the common electrode is still higher than the pixel electrode. Voltage value. When the frame is changed to the N+2 frame, the voltage difference between the pixel electrode and the common electrode of all the sub-pixels in the panel will be changed to positive, that is, the voltage value of the common electrode is lower than the voltage of the pixel electrode. value. With this driving method, the liquid crystal molecules of the adjacent frames must be switched when the frame is switched. It is necessary to alternately deflect in the opposite direction. However, the method of the present invention can at least allow the liquid crystal molecules of adjacent frames to be deflected in the opposite direction when the frame is switched, that is, the liquid crystal molecules are at least The time between two adjacent frames is maintained in the same yaw direction of positive voltage difference or negative voltage difference, so the voltage value applied to the pixel electrode does not need to be changed greatly in the adjacent frame time, but can be greatly changed. Reduce power consumption. It should be noted that the above description of the present invention is based on the frame inversion driving mode, but the present invention is also applicable to the line inversion driving mode, the column inversion driving mode, and the dot inversion driving mode. For example, when the present invention is applied to the row inversion driving mode, in one of the adjacent frames, one of the rows in the panel, if the voltage difference between the pixel electrode and the common electrode in the Nth frame is negative, That is, the voltage value of the common electrode is higher than the voltage value of the pixel electrode. When the frame is changed to the N+1 frame, the voltage difference between the sub-pixel pixel and the common electrode of the row in the panel remains. Negative, that is, the voltage value of the common electrode is still higher than the voltage value of the pixel electrode until the frame is changed to the N+2 frame, and the sub-pixel pixel and the common electrode of the row in the panel are The voltage difference will change to positive, that is, the voltage value of the common electrode is lower than the voltage value of the pixel electrode, so that at least the pixel voltage and the data signal of the adjacent frame need not be alternated when the frame is switched. Deflection in the opposite direction.

Referring to FIG. 6C, in accordance with an embodiment of the present invention, when the driving method described above is applied to a liquid crystal display for multi-column inversion driving, the panel pixels are in adjacent four frames. Schematic diagram of the voltage difference. In a certain frame, the voltage difference between all the sub-pixels in the same row and the common electrode is the same (not positive or negative), and the voltage difference can maintain at least two frames. For example, in the Nth frame, in line (1) The voltage difference between all sub-pixels and the common electrode is positive, that is, the voltage value of the common electrode is lower than the voltage value of the pixel electrode, and the voltage difference between all the sub-pixels in the row (2) and the common electrode is Negative, that is, the voltage value of the common electrode is kept higher than the voltage value of the pixel electrode. When the frame is changed to the N+1th frame, the voltage difference between all the sub-pixels in the row (1) and the common electrode is maintained positive, that is, the voltage value of the common electrode is still lower than the pixel. The voltage value of the electrode, and the voltage difference between all the sub-pixels in the row (2) and the common electrode is also maintained negative, that is, the voltage value of the common electrode is kept higher than the voltage value of the pixel electrode. When the frame is changed to the N+2 frame, the voltage difference between all the sub-pixels in the row (1) and the common electrode is changed to be negative, that is, the voltage value of the common electrode is higher than that of the pixel electrode. The voltage value, and the voltage difference between all the sub-pixels in the row (2) and the common electrode is changed to be positive, that is, the voltage value of the common electrode is lower than the voltage value of the pixel electrode. When the frame is changed to the N+3 frame, the voltage difference between all the sub-pixels in the row (1) and the common electrode is maintained to be negative, that is, the voltage value of the common electrode is kept higher than the pixel electrode. The voltage value is maintained, and the voltage difference between all the sub-pixels in the row (2) and the common electrode is maintained to be positive, that is, the voltage value of the common electrode is kept lower than the voltage value of the pixel electrode. With this driving method, the liquid crystal molecules in the same row of the adjacent frames must be alternately deflected in the opposite direction when the frame is switched. However, the method of the present invention can at least allow the liquid crystal molecules of the same row in the adjacent frame to be When the frame is switched, it is not necessary to apply a voltage signal alternately in the opposite direction, that is, to keep the pixel voltage and the data signal of the same row at a positive voltage difference or a negative voltage difference for at least two adjacent frames. The same voltage signal, therefore, the voltage value applied to the pixel electrode does not need to be greatly changed in the adjacent frame time, and the driving circuit can greatly reduce the power consumption.

In addition, the driving method of the present invention can also be used to drive three consecutive driving modes with the same voltage difference, as shown in FIG. 6D, wherein in the Nth frame, rows (1), rows (2) and rows The voltage difference of all the sub-pixels in (3) is positive, that is, the voltage value of the common electrode is lower than the voltage value of the pixel electrode, and all of the rows (4), (5), and (6) The voltage difference of the sub-pixels is negative, that is, the voltage value of the common electrode is higher than the voltage value of the pixel electrode. When the frame is changed to the N+1th frame, the voltage difference of all the sub-pixels in the row (1), the row (2), and the row (3) is maintained to be positive, that is, the voltage value of the common electrode. Keep the voltage lower than the pixel voltage, and the voltage difference of all the sub-pixels in row (4), row (5) and row (6) is also maintained negative, that is, the voltage value of the common electrode remains higher than the picture. The voltage value of the element electrode. When the frame is changed to the N+2 frame, the voltage difference of all the sub-pixels in the row (1), the row (2), and the row (3) is changed to be negative, that is, the voltage value of the common electrode is made. Higher than the voltage value of the pixel electrode, and the voltage difference of all the sub-pixels in row (4), row (5) and row (6) is changed to positive, that is, the voltage value of the common electrode is lower than that of the pixel electrode. Voltage value. When the frame is changed to the N+3 frame, the voltage difference of all the sub-pixels in the row (1), the row (2), and the row (3) is maintained to be negative, that is, the voltage value of the common electrode is maintained. Higher than the voltage value of the pixel electrode, and the voltage difference of all the sub-pixels in row (4), row (5) and row (6) is maintained positive, that is, the voltage value of the common electrode remains lower than the pixel electrode The voltage value, according to which the voltage value applied to the pixel electrode does not need to be changed greatly in the adjacent frame time, and the voltage value applied to the pixel electrode is reduced in the polarity of the adjacent row. , but can greatly reduce power consumption.

In addition, the frequency of the polarity change of the pixel electrode of the present invention is variable. For example, if the frequency of the polarity change of the original pixel electrode is 60 Hz, the method of the present invention maintains at least two frames unchanged due to the polarity change of the pixel electrode. Therefore, the frequency of the polarity change of the pixel electrode will be at least less than 30 Hz. In other words, in an embodiment, if the polarity of the original pixel electrode changes by f Hz, when the polarity change of the pixel electrode is at least maintained at the N frame, the frequency of the polarity change of the pixel electrode is lowered. /N Hertz.

In another aspect, the above application of the present invention is to maintain the pixel voltage and the data signal in the same yaw direction of a positive voltage difference or a negative voltage difference for at least two adjacent frames, but in other embodiments, The liquid crystal molecules can be held in the same deflection direction of a voltage difference for three consecutive frames, and then held in the same deflection direction of another voltage difference during the time of the two consecutive frames. In other words, the same voltage difference deflection method of the continuous frame of the present invention can be any number of consecutive frame combinations, not limited to the above embodiments, as long as the liquid crystal molecules are kept at the same voltage difference for at least two consecutive frame times. The polarity signal can achieve the purpose of reducing power consumption.

In addition, the present invention further divides the time of a frame into: a driving period of the gate driver and the source driver, and a sleep period or a stationary period of the gate driver and the source driver. The source driver sends the data signal only during the period in which the scan line is driven, and the source driver stops sending the data signal during the period when the scan line is not driven, so the supply or the source driver or the gate driver can be stopped. Drive voltage or drive current to reduce power consumption. In one embodiment, the gate driver and the source driver are driven for at least less than 80% of the time of the frame. In another embodiment, the driving of the gate driver and the source driver can be driven in a frame time in a manner of discontinuous driving, so that the scanning signal and the data signal required for displaying a frame are displayed in a picture. Part of the box time The time period is sent out. In this embodiment, the time of each gate driver and source driver occupies at least 40% of the time of a frame.

Figure 7 is a block diagram showing a panel display driving device according to an embodiment of the present invention. The display panel 701 of the panel display driving device 700 includes an array of display units. The display cell array is generally a matrix of determinants, and each display cell is controlled by the source driver 730 and the gate driver 720 via the data line 731 and the scan line 721, respectively. The gate driver 720 and the source driver 730 are generally connected in series by one or more integrated circuits. For example, the source driver 730 in FIG. 7 includes L source drivers 730(0) to 730(L-1). , L is a positive integer. Each of the source drivers 730(0) to 730(L-1) has X data outputs, for example, the source driver 730(0) has 731(0)~731(X-1) data outputs, and L source drivers are used to drive M data lines. Each display unit 740 has a switch 741 (eg, a thin film transistor), a liquid crystal capacitor 742, and a storage capacitor 743, respectively. The switch 741 transfers the data of the corresponding data line to the liquid crystal capacitor 742 and the storage capacitor 743 according to the signal corresponding to the scan line. The liquid crystal capacitor 742 and the storage capacitor 743 store the data of the data line based on the common voltage Vcom and the storage voltage Vst, respectively. The source driver 730 drives the corresponding display unit according to the matrix image data provided by the timing controller 710. The gate driver 720 will turn on the display unit of the corresponding row in a row-by-row manner via the scan lines 721(0)-721(N). In conjunction with the timing of the gate driver 720, the source drivers 730(0)~730(L-1) also transmit the display data to the corresponding display unit via the M data lines, and each display unit displays the specified time at the specified time. s color. The panel display driving device 700 can be used for a liquid crystal display, an electronic swimming display, an organic light emitting diode display, An electrowetting display, a MEMS (microelectromechanical) display or a germanium based microdisplay. In one embodiment, each of the pixel units in the display driving device includes at least two or more thin film transistor switches, a double gate thin film transistor, and a lightly doped thin film transistor. The gate driver 720 corresponds to one of the pixel units, and the gate unit is an amorphous germanium thin film transistor and an oxide thin film transistor (Oxide TFT).

FIG. 8 is a timing diagram showing the gate driver sending a scan line driving signal in a frame time according to an embodiment of the invention. Please refer to FIG. 7 and FIG. 8 together, wherein the frame N has a frame time 800, and the frame time 800 further includes: a driving period 801 of the gate driver and the source driver, and a gate driver and a source Sleep period 802 of the drive. In the driving period 801, the gate driver sends the scan line driving signal to scan the scan lines 721(0)-721(N), and the source driver 730 correspondingly sends the data signal. In the sleep period 802, the gate driver 720 stops sending the scan line driving signals to the scan lines 721(0) to 721(N), and the source driver 730 stops sending the data signals. During the sleep period 802, the voltage supplied to the gate driver 720 and the source driver 730 will be stopped or reduced, thereby reducing overall energy consumption. Further, in an embodiment, (the driving period 801) / (the driving period 801 + the sleeping period 802) is greater than 0.3. More preferably (the driving period 801) / (the driving period 801 + the sleeping period 802) is greater than 0.6. Moreover, in one embodiment, the power required by gate driver 720 and source driver 730 during the sleep period 802 is less than the power required by gate driver 720 and source driver 730 during the drive period 801. . In another embodiment, the average power consumed by the gate driver 720 and the source driver 730 during the sleep period 802 is less than the average consumed by the gate driver 720 and the source driver 730 during the driving period 801. power.

Accordingly, according to the present invention, during the time period 801, the timing controller 710 controls the gate driver 720 to scan each of the plurality of scan lines 721(0) to 721(N) of the display panel 701, enabling (or turning on) each The source drivers 730(0)-730(L-1) cause each of the source drivers 730(0)-730(L-1) to transmit signals to the corresponding data lines in the display panel 701 via the data output terminals. After the plurality of scan lines 721(0)-721(N) of the display panel 701 are scanned, the time period 802 is entered, and each of the source drivers 730(0)~730(L) is disabled (or turned off). -1) the data output end, and each source driver 730(0)~730(L-1) stops transmitting the signal to the corresponding data line in the display panel 701 until the frame time 800 ends, and enters the next A frame N+1. In this embodiment, it is assumed that, in a frame time, when each data line sends out a complete frame (frame) data, the data of each source driver 730(0)~730(L-1) is disabled. The output terminal causes each of the source drivers 730(0)~730(L-1) to stop transmitting signals to the display panel 701. At this time, due to the relationship of the display unit storage capacitors 743, the last screen can be continuously maintained on the display screen. Up until the end of this frame time. In addition, in order to avoid display distortion due to a decrease in voltage maintenance rate, in the present invention, the capacitance value of the storage capacitor can be made significantly larger than the liquid crystal capacitance, thereby increasing the voltage holding ratio of the display signal. In one embodiment, the capacitance of the storage capacitors is greater than or equal to ten or even fifty times the capacitance of the liquid crystal capacitors. Thereby, the voltage maintenance rate of the display signal is increased. Accordingly, in a frame time, the present invention drives the gate driver 720 and the source driver 730 in a manner of discontinuous driving, so that the scanning signals and data signals required for displaying a frame are displayed in a frame. During a portion of the time period, the drive gate driver 720 and the source driver 730 are completed, and during the remaining time period, such as during the time period 802, the gate driver 720 and the source driver 730 are put into a sleep state, that is, stopped. The driving voltages of the gate driver 720 and the source driver 730 are supplied or reduced to achieve the purpose of reducing power consumption.

For example, in an embodiment, when the liquid crystal display update rate is lowered from 60 Hz to 10 Hz, that is, the time required to scan a frame is increased from 16.67 ms to 100 ms, for a 1024×768 liquid crystal display, it is conventionally known. In the driving method, the time required to scan the 768 scanning lines is increased from 16.67 ms to 100 ms, that is, the time for scanning one scanning line is only 21.7 us, and now it is increased to 130 us. Therefore, according to the conventional driving In the method, although the update rate is lowered, the gate driver 720 and the source driver 730 continue to scan the scan lines and transfer data to the data lines during the time of the frame, thus the gate driver 720 and the source. The pole driver 730 does not substantially reduce the power consumption, and at most saves the power phase number when switching the frame due to the reduced update rate. However, according to the present invention, when the liquid crystal display update rate is lowered from 60 Hz to 10 Hz, that is, the time required to scan a frame is increased from 16.67 ms to 100 ms, for a liquid crystal display having 1024*768 pixel units, In the driving method of the present invention, the time for scanning one scanning line remains at 21.7 us, so the time required to scan 768 scanning lines is still 16.67 ms, and in the remaining time (100 ms - 16.67 ms), The gate driver 720 and the source driver 730 will be in a sleep state, that is, the operating voltages of the gate driver 720 and the source driver 730 are turned off or lowered, and thus the power consumption of the gate driver 720 and the source driver 730 is Will be substantially reduced.

On the other hand, according to the present invention, when the source driver 730 switches the polarity signal in the image signal at the first frequency, the gate driver 720 drives the scan line at a second frequency, wherein the second frequency is greater than the first frequency. The first frequency is 0.1 to 30 Hz, and the second frequency is 40 to 200 Hz.

In addition, it is worth noting that in the driving method of the present invention, the time for scanning one scanning line is not necessarily limited to 21.7 us, and the time required to scan 768 scanning lines is within 100 ms, and the part is reserved. For the remainder of the time, the operating voltages of the gate driver 720 and the source driver 730 can be turned off or reduced, and the power consumption can be substantially reduced. In addition, the case does not limit the 768 scan lines to be scanned simultaneously, that is, the case can be scanned discontinuously, that is, 768 scan lines are divided into groups, which are scattered and scanned in a frame time. And a plurality of sleep periods are arranged between the scan periods to separate each scan period, wherein the so-called sleep period is to turn off or lower the operating voltages of the gate driver 720 and the source driver 730.

It should be noted that in the above embodiment of the present invention, a frame time 800 is divided into two periods, the gate driver 720 sends out the scan line driving signal period 801, and the gate driver 720 stops sending the scan line driving signal. The time period 802, in other embodiments, the time period during which the gate driver sends the scan line driving signal can be dispersed in a frame time, as long as all the scan lines can be scanned in the frame time. can. For example, the scan lines 721(0)-721(N) are divided into at least two groups, and in a frame time, the gate driver 720 scans the group to scan a group, and the source driver 730 sends a data signal. After the scanning of the group is completed, the gate driver 720 and the source driver 730 are disabled for a period of time, and then the gate driver 720 scans another group, and the source driver 730 correspondingly sends the data signal. Since the gate driver 720 and the source driver 730 are in an inactive sleep state during a portion of the frame time, the operating voltages of the gate driver 720 and the source driver 730 are turned off or lowered, so the overall power is Consumption can be reduced.

In addition, the above-described discontinuous driving method of the present invention can also perform liquid crystal molecules in accordance with the multi-frame inversion driving mode, the multi-row inversion driving mode, the multi-column inversion driving mode, and the multi-inversion driving mode proposed in the present invention. Drive. For example, in conjunction with the frame inversion driving mode proposed by the present invention, as shown in FIGS. 7 and 9, in the present embodiment, a frame period is only divided into a gate driver 720 and a source. The driving period 903 of the pole driver 730, and the sleep period 904 of the gate driver 720 and the source driver 730, in other embodiments, may be increased according to the usage conditions. In the driving period 903 of the Nth frame, the source driver 730 sends the data signal 902 lower than the common electrode voltage value 901 by the discontinuous driving of the source driver 730, so that the polarity of all sub-pixels in the panel is made. Both are negative, and in the sleep period 904 of the Nth frame, the operating voltages of the gate driver 720 and the source driver 730 are turned off or reduced. When the frame is changed to the (N+1)th frame, similarly, in the driving period 903 of the (N+1)th frame, the source driver 730 is sent low by means of discontinuous driving of the source driver 730. The data signal 902 of the common electrode voltage value 901 is such that all sub-pixels in the panel have negative polarities, and in the sleep period 904 of the (N+1)th frame, the gate driver 720 and the source are turned off or lowered. The operating voltage of the driver 730. When the frame is changed to the N+2 frame, at this time, in the driving period 903 of the N+2 frame, the source driver 730 is sent high by discontinuously driving the source driver 730. The data signal 902 of the common electrode voltage value 901 is shared so that the polarity of all sub-pixels in the panel is positive, and in the sleep period 904 of the N+2 frame, the gate driver 720 and the source are turned off or lowered. The operating voltage of the driver 730, and so on. By this method, the gate driver 720 and the source driver 730 can have a sleep period in each frame time, thereby reducing the power consumption of the gate driver 720 and the source driver 730, and more at least During the two consecutive frame times, the pixel voltage and the data signal are kept at the same polarity signal, and the number of polarity signal conversions is reduced to achieve the purpose of reducing power consumption.

In summary, the display driving method of the present invention can not only reduce the pixel voltage and the number of times the data signal is switched in the opposite direction when the frame signal is switched, but also by displaying the time of the frame. The division is divided into: a driving period of the gate driver and the source driver, and a sleep period or a stationary period of the gate driver and the source driver, wherein the source driver sends the data only during the period in which the gate driver drives the scan line Signal, and during the period when the gate driver does not drive the scan line, the supply of the data signal to the data line is also stopped, so that the supply voltage of the source driver and the gate driver can be stopped or reduced, thereby achieving double power consumption reduction. The purpose. In addition, the driving method described above may be performed by a driving integrated circuit or a timing controller of a display device, or may be performed by a driving device integrated with a display device and a timing controller without constructing additional driving components.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

501, 502, 503 and 504. . . Voltage waveform

700. . . Panel display drive

701. . . Display panel

710. . . Timing controller

720. . . Gate driver

721. . . Scanning line

721(0)~721(N). . . Scanning line

730. . . Source driver

730 (0) to 730 (L-1). . . Source driver

731. . . Data line

731(0)~731(X-1). . . Data output

740. . . Display unit

741. . . switch

742. . . Liquid crystal capacitor

743. . . Storage capacitor

800. . . Frame time

801. . . Driving time period

802. . . Sleep period

901. . . Common electrode voltage value

902. . . Data signal

903. . . Driving time period

904. . . Sleep period

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Figure 1 shows the polarity of the source output signal and the corresponding pixel in the conventional frame inversion drive mode.

Figure 2 shows the polarity of the source output signal and the corresponding pixel in the conventional line inversion drive mode.

Figure 3 shows the polarity of the source output signal and the corresponding pixel in the conventional column inversion drive mode.

Figure 4 shows the source output signal and the polarity of the corresponding pixel in the conventional dot inversion drive mode.

FIG. 5 is a schematic diagram showing driving waveforms of a conventional liquid crystal display using a fixed common electrode voltage in a frame inversion driving mode.

FIG. 6A is a schematic diagram showing driving waveforms of a liquid crystal display using a fixed common electrode voltage in a frame inversion driving mode according to an embodiment of the invention.

FIG. 6B is a schematic diagram showing the polarities of all the pixels in the panel in the adjacent three frames in the multi-frame inversion driving mode of the liquid crystal display according to an embodiment of the invention.

FIG. 6C is a schematic diagram showing the polarity of panel pixels in adjacent four frames when multi-line inversion driving is performed according to an embodiment of the invention.

FIG. 6D is a schematic diagram showing the polarity of panel pixels in adjacent four frames when multi-line inversion driving is performed according to an embodiment of the invention.

Figure 7 is a block diagram showing a panel display driving device according to an embodiment of the present invention.

Figure 8 is a timing diagram showing the gate driver transmitting a scan line drive signal in a frame time in accordance with an embodiment of the present invention.

Figure 9 is a timing chart showing the driving of liquid crystal molecules according to an embodiment of the present invention.

901. . . Common electrode voltage value

902. . . Data signal

903. . . Driving time period

904. . . Sleep period

Claims (34)

A driving method for driving a display driving device, wherein the display driving device includes at least a first driving circuit, a second driving circuit, a plurality of first signal lines coupled to the first driving circuit, and a plurality of The second signal line is coupled to the second driving circuit, wherein the plurality of first signal lines intersect the plurality of second signal lines and form a plurality of pixels at the intersection to form a pixel matrix, the method comprising: at least: The pixel matrix applies an image signal having a polarity signal, wherein the polarity signal is a first polarity signal or a second polarity signal of opposite polarity; and maintaining the polarity signal applied by at least one pixel in the pixel matrix for at least two consecutive The frame does not change. The driving method of claim 1, further comprising maintaining the polarity signal applied by at least one column of pixels in the pixel matrix for at least two consecutive frames. The driving method of claim 1, further comprising maintaining the polarity signal applied by at least one pixel or at least one column of the pixel matrix for at least six consecutive frames. The driving method of claim 1, wherein the polarity signal is a voltage signal or a current signal. The driving method of claim 1, further comprising: applying the polarity signal to a portion of the pixel matrix in a first time interval in a frame; and one of the second time in the frame In the interval, the application of the polarity signal or the application of a sleep signal or a stationary signal is stopped. The driving method of claim 5, wherein the second driving circuit selects part or all of the pixel matrix through the second signal lines, and the first driving circuit transmits the first signals The line pair selects the image signal of the polarity signal for the portion or all of the pixel matrix selected. The driving method of claim 6, wherein the second driving circuit or the first driving circuit is stopped or reduced in supply current or voltage during the second time interval in the frame. The driving method of claim 6, wherein the first driving circuit or the second driving circuit requires less power in the second time interval than the first driving circuit or the second driving The power required by the circuit during the first time interval. The driving method of claim 6, wherein the first driving circuit or the second driving circuit consumes less average power in the second time interval than the first driving circuit or the second driving Circuit in The average power consumed during the first time interval. For example, in the driving method described in claim 5, the frame may have a plurality of first time intervals or a plurality of second time intervals. The driving method of claim 5, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.3. The driving method of claim 1, wherein applying the voltage signal to the pixel matrix further comprises: dividing the pixel matrix into a plurality of regions; and applying the regions to the regions in a plurality of time intervals in a frame a polarity signal; and stopping the application of the polarity signal or applying a sleep signal and a stationary signal to the regions in the remaining time intervals in the frame. The driving method of claim 1, wherein applying a polarity signal to the pixel matrix further comprises: respectively, at least two adjacent rows, any two adjacent columns, or any two adjacent pixels of the pixel matrix The first polarity signal and the second polarity signal are applied. The driving method of claim 1, wherein applying a polarity signal to the pixel matrix further comprises: The first polarity signal or the second polarity signal is applied by a pixel. The driving method of claim 1, wherein applying a polarity signal to the pixel matrix further comprises: simultaneously applying at least two adjacent rows, at least two adjacent columns, or at least two adjacent pixels of the pixel matrix. The first polarity signal or the second polarity signal. The driving method of claim 1, wherein the display driving device comprises at least two or more thin film transistor switches, one double gate thin film transistor, and one light doping corresponding to each pixel unit. Bungee thin film transistor. The driving method of claim 1, wherein one gate unit corresponding to each pixel unit in the display driving device is an amorphous germanium thin film transistor and an oxide thin film transistor (Oxide TFT). The driving method of claim 1, wherein the display driving device switches the frames at a first frequency, wherein the second driving circuit drives the scanning lines at a second frequency, wherein the scanning circuit The second frequency is greater than the first frequency. The driving method of claim 1, wherein the display driving device is a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, and a矽-based micro display, an active matrix display or half Conductor 矽 wafer matrix. A driving method for driving a display driving device, wherein the display driving device includes at least a first driving circuit, a second driving circuit, a plurality of first signal lines coupled to the first driving circuit, and a plurality of The second signal line is coupled to the second driving circuit, wherein the plurality of first signal lines intersect the plurality of second signal lines and form a plurality of pixels at the intersection to form a pixel matrix, the method comprising: at least: Applying an image signal to a portion of the pixel matrix in a first time interval of the frame; and stopping applying the image signal or applying a sleep signal or a still signal in a second time interval of the frame . For example, in the driving method described in claim 20, the frame may have a plurality of first time intervals, or a plurality of second time intervals. The driving method of claim 20, wherein the second driving circuit selects part or all of the pixel matrix through the second signal lines, and the first driving circuit transmits the first signals The line pair applies the image signal to the portion or all of the pixel matrix selected. The driving method of claim 22, wherein the second driving circuit and or the first driving circuit are stopped or reduced in supply current or voltage during the second time interval in the frame. The driving method of claim 20, wherein the second time zone is a sleep time or a stationary time of the first driving circuit or the second driving circuit. The driving method of claim 20, wherein the first driving circuit or the second driving circuit requires less power in the second time interval than the first driving circuit or the second driving The power required by the circuit during the first time interval. The driving method of claim 20, wherein the average power consumed by the first driving circuit or the second driving circuit in the second time interval is smaller than the first driving circuit or the second driving The average power consumed by the circuit during the first time interval. The driving method of claim 20, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.3. The driving method of claim 20, wherein (the second time interval) / (the first time interval + the second time interval) is greater than 0.6. For example, in the driving method described in claim 20, a polarity signal is applied to the pixel matrix, wherein the polarity signal is a first polarity signal. a second polarity signal of opposite polarity or opposite polarity; and maintaining the polarity signal applied by at least one pixel of the pixel matrix for at least two consecutive frames. The driving method of claim 20, wherein when the image signal of the pixel matrix switches the polarity of the polarity signal at a first frequency, the second driving circuit drives the second frequency a scan line, wherein the second frequency is greater than the first frequency. The driving method of claim 30, wherein the first frequency is 0.1 to 30 Hz, and the second frequency is 40 to 200 Hz. The driving method of claim 20, wherein the display driving device comprises at least two or more thin film transistor switches, a double gate thin film transistor, and a light blending corresponding to each of the pixel units. Hybrid electrode film transistor. The driving method of claim 20, wherein the second driving circuit corresponding to each of the pixel units in the display driving device is an amorphous germanium thin film transistor and an oxide thin film transistor (Oxide) TFT). The driving method of claim 20, wherein the display driving device is a liquid crystal display, an electrophoretic display, an organic light emitting diode display, an electrowetting display, a MEMS microelectromechanical display, and a矽-based micro display, an active matrix display or half Conductor 矽 wafer matrix.