TWI409770B - Method for driving liquid crystal display - Google Patents

Abstract

A method for driving liquid crystal display (LCD) is disclosed. The main manner of the method submitted by the present invention is used for dividing a frame period into at least two sub-frame periods, i. e. the turn on time in every pixel row is divided into at least two parts, wherein one of the sub-frame periods is used for providing a charging/discharging voltage that is higher/lower than a original pixel voltage received by pixels to the pixels for use, and the other sub-frame period is used for providing a holding voltage that is equal to the original pixel voltage received by the pixels to the pixels for use. Therefore, the angles of the liquid crystal of the pixels can be positioned within the turn on time in every pixel row, and further the liquid crystal of the pixels can be situated in stable.

Description

Liquid crystal display driving method

The present invention relates to a flat display technology, and more particularly to a method of driving a liquid crystal display.

In recent years, with the rapid development of semiconductor technology, portable electronic products and flat panel display products have also emerged. Among the many types of flat panel displays, liquid crystal displays (LCDs) have become the mainstream of display products based on their low voltage operation, no radiation scattering, light weight and small size.

In theory, when a liquid crystal display wants to display an image, it must sequentially open each column of pixels in the liquid crystal display panel through a gate driver, and each column of pixels is turned on. The corresponding pixel voltage provided by the source driver is received during the time. In this way, the liquid crystal molecules of each column of pixels in the liquid crystal display panel are transferred to the positioning according to the pixel voltage they receive. Therefore, when the backlight module provides a light source for the liquid crystal display panel, the liquid crystal display can achieve the purpose of displaying the image.

However, since the reaction speed of liquid crystal molecules of today's pixels is not fast enough, the liquid crystal molecules of the pixels are not necessarily able to be based on the pixel voltage they receive within this limited time during the time when each column of pixels is turned on. And go to positioning. Because of this, the image displayed on the LCD display will produce a lot of flaws, such as: dynamic blur or the bottom of the backlight using color sequential method. Partial color mixing or dispersion phenomenon.

In order to solve the above mentioned problems, the general method can increase the pixel voltage that the source driver should provide, so that the reaction speed of the liquid crystal molecules of the pixels is accelerated. In this way, the liquid crystal molecules of the pixels can be turned to the angle at the time when each column of pixels is turned on, but when the liquid crystal molecules of the pixels turn to their angles, the liquid crystal molecules of the pixels at this time Since it is still rotating, it will be in a relatively unstable state. Therefore, it is highly probable that the image displayed on the liquid crystal display will flicker.

Moreover, another method can shorten the time for opening each column of pixels, and borrow more time to make the liquid crystal molecules of the pixels reach a stable state. In this way, although the image displayed on the liquid crystal display does not produce flicker, since the time for opening each column of pixels has been shortened, it is highly probable that the liquid crystal molecules of the pixels are not turned to their angles. Therefore, under the conditions of this method, it is highly probable that the quality of the image displayed on the liquid crystal display is deteriorated.

In view of the above, an object of the present invention is to provide a driving method for a liquid crystal display, which divides the time of opening each column of pixels into at least two segments, thereby driving the pixels in segments, thereby causing liquid crystal molecules of pixels. Not only can it be turned to its angle in the time when each column of pixels is turned on, but it can also be in a stable state.

Based on the above and its intended purpose, the present invention proposes a liquid crystal The driving method of the display comprises the following steps: First, dividing one picture period into at least one charging and discharging electronic picture period and one holding sub-picture period. Next, it is determined that the pixels of the liquid crystal display panel are to be charged or discharged, wherein when the pixels of the liquid crystal display panel are to be charged, the first pixel voltage required by the pixels of the liquid crystal display panel is used to charge and discharge the electrons. A charging voltage higher than the first pixel voltage is first supplied during the picture to charge the pixels of the liquid crystal display panel in the front stage. Thereafter, a first holding voltage equal to the first pixel voltage is further supplied during the holding of the sub-picture to post-charge the pixels of the liquid crystal display panel or maintain the potential of the pixel of the liquid crystal display panel at the The potential of the first pixel voltage, and the backlight required for the liquid crystal display panel is provided during the holding of the sub-picture.

In addition, when the pixel of the liquid crystal display panel is to be discharged, according to the second pixel voltage required by the pixel of the liquid crystal display panel, the voltage lower than the second pixel voltage is first provided during the charging and discharging of the electronic image. The discharge voltage is discharged to the front side of the pixel of the liquid crystal display panel. Thereafter, a second holding voltage equipotential to the second pixel voltage is further supplied during the holding of the sub-picture to perform post-discharge of the pixel of the liquid crystal display panel or maintain the potential of the pixel of the liquid crystal display panel at the The potential of the second pixel voltage, and the backlight required for the liquid crystal display panel is provided during the holding of the sub-picture.

In an embodiment of the invention, the pixel of the liquid crystal display panel is known to be charged or discharged by the timing controller according to the image signal received by the timing controller.

In an embodiment of the invention, the picture period is a picture of the liquid crystal display Face update rate.

In an embodiment of the invention, the backlight required for the liquid crystal display panel is a blinking backlight or a color sequential backlight.

From another point of view, the present invention provides a driving method of a liquid crystal display, comprising the following steps: First, dividing a display area of a liquid crystal display panel into a plurality of regions. Next, one picture period in each display area is divided into at least one charging and discharging electronic picture period and one holding sub-picture period. Then, it is sequentially determined that each region of the pixel is to be charged or discharged, wherein when the pixel in the Nth region is to be charged, the first pixel voltage required by the pixel in the Nth region is used to charge and discharge the electronic image. A first charging voltage higher than the first pixel voltage is first supplied to charge the pixels in the Nth region in a front stage.

Thereafter, a first holding voltage equal to the first pixel voltage is further supplied during the holding of the sub-picture to post-charge the pixel in the N-th region or maintain the potential of the pixel in the N-th region at the first The potential of the pixel voltage and the first backlight required to provide the pixels in the Nth region during the holding of the sub-picture, where N is a positive integer.

In addition, when the pixel in the Nth region is to be discharged, according to the second pixel voltage required by the pixels in the Nth region, the first voltage lower than the second pixel voltage is provided during the charging and discharging of the electronic image. Discharge voltage to discharge the front segment of the pixel in the Nth region. Thereafter, a second holding voltage equipotential to the second pixel voltage is further supplied during the holding of the sub-picture to perform post-discharge of the pixels in the N-th region or maintain the potential of the pixels in the N-th region at the The potential of the two pixel voltages and the first backlight required to provide the pixels in the Nth region during the holding of the sub-picture.

In an embodiment of the present invention, after providing the first backlight required for the pixel in the Nth region, the method further includes the following steps: First, when the pixel in the (N+1) region is to be charged, according to the first ( N+1) a third pixel voltage required for the pixels in the region, and a second charging voltage higher than the third pixel voltage is first supplied during the charging and discharging of the electronic image to the (N+1)th region The internal pixels are charged in the front stage. Thereafter, a third holding voltage equipotential to the third pixel voltage is further provided during the holding of the sub-picture to perform post-charging of the (N+1)-region pixel or the (N+1)-region pixel The potential is maintained at the potential of the third pixel voltage and provides a second backlight required for the pixels in the (N+1)th region during the holding of the sub-picture.

In addition, when the pixel in the (N+1)th region is to be discharged, the fourth pixel voltage required according to the pixel in the (N+1)th region is first provided during the charging and discharging of the electronic image. The second discharge voltage of the fourth pixel voltage is used to discharge the front segment of the pixel in the (N+1)th region. Thereafter, a fourth holding voltage equal to the fourth pixel voltage is further supplied during the holding of the sub-picture to perform post-discharge on the pixel of the (N+1)th region or to the (N+1)th region. The potential of the pixel is maintained at the potential of the fourth pixel voltage, and the second backlight required for the pixel of the (N+1)th region is provided during the holding of the sub-picture.

In an embodiment of the invention, the charging or discharging of each pixel in the area is known by the timing controller according to the received image signal.

In an embodiment of the invention, the backlight is a first backlight and a second The backlight constitutes a scanning backlight or a color sequential scanning backlight.

In an embodiment of the invention, the picture period is a picture update rate of the liquid crystal display.

From another point of view, the present invention can provide a liquid crystal display having a driving method using the above two types of liquid crystal displays.

The driving method of the liquid crystal display proposed by the present invention mainly divides one picture period into at least two sub-picture periods (that is, the time when each column of pixels is turned on is divided into at least two periods), and during one of the sub-picture periods Providing a charge/discharge voltage that is higher/lower than the pixel voltage that the pixel should receive, for the pixel, and providing a hold voltage of the pixel voltage equivalent to the pixel that should be received during the other sub-pixels. Use. Thereby, the liquid crystal molecules of the pixels can be turned to the angles of the pixels in the time when each column of pixels is turned on, and can be in a stable state, so that the image of the liquid crystal display provided by the invention not only does not flicker. And its picture quality will also improve.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The technical effect to be achieved by the present invention is mainly to solve the problem that the liquid crystal display of the pixel is not fast enough to cause the display image flicker of the liquid crystal display and the image quality to be inferior. The following content will be described in detail for the technical features of the present case to provide general knowledge to the field of the invention. See the details.

FIG. 1 is a system architecture diagram of a general liquid crystal display 100. Referring to FIG. 1 , the liquid crystal display 100 includes a timing controller 101 , a gate driver 102 , a source driver 103 , a liquid crystal display panel 104 , and a backlight module 105 . The coupling relationship and operation mode between these components should be familiar to those of ordinary skill in the art, and will not be further described herein. In addition, the driving methods of the two liquid crystal displays to be proposed by the present invention are all applicable to a system architecture such as the liquid crystal display 100.

2A is a flow chart showing a driving method of a liquid crystal display according to an embodiment of the invention. 2B is a timing chart showing driving of a liquid crystal display according to an embodiment of the invention. Referring to FIG. 1 , FIG. 2A and FIG. 2B , the driving method of the liquid crystal display of the embodiment includes the following steps: First, as shown in step S201 , dividing a picture period F into at least one charging and discharging electronic picture period OD and one holding During the sub-picture period HD. The frame period described in this step S201 generally refers to the frame rate of the liquid crystal display 100, that is, the time required for the liquid crystal display 100 to display one image frame.

Taking the liquid crystal display 100 having a screen update rate of 60 Hz as an example, since the picture period F described in step S201 is at least divided into two sub-picture periods (that is, charging and discharging the electronic picture period OD and holding the sub-picture period HD), This embodiment is not limited thereto. That is to say, the picture period described in step S201 can also be divided into two or more periods of charging and discharging electronic pictures and one holding of sub-picture periods. Therefore, according to the above, it is known. Yes, the screen update rate of the liquid crystal display 100 is raised to at least 120 Hz. Also, the two sub-images displayed on the liquid crystal display 100 are superimposed to form an original image frame.

In order to achieve the technical effect of the step S201, the timing controller 101 must control the gate driver 102 to turn on all the columns of pixels (not shown) in the liquid crystal display panel 104 one by one during each of the charging and discharging electronic screens. Next, when the sub-screen period HD is held, all the column pixels in the liquid crystal display panel 104 are turned on one by one. In other words, the opening time of each column of pixels in the liquid crystal display panel 104 is changed from the original entire time (ie, 1/60 second) to at least two periods of time (ie, 1/120 second + 1/120 seconds). .

Next, as described in step S203, it is determined that the pixels of the liquid crystal display panel 104 are to be charged or discharged. In step S203, the timing controller 101 knows the state in which all the pixels in the liquid crystal display panel 104 are to be charged or discharged according to the received video signals. Thereby, the timing controller 101 controls the source driver 103 to generate a corresponding pixel voltage to be supplied to the pixels in the liquid crystal display panel 104 for charging or discharging.

In this embodiment, when the pixel of the liquid crystal display panel 104 is to be charged, the operation as described in step S205 is performed, that is, according to the first pixel voltage required by the pixel of the liquid crystal display panel 104, During the charging and discharging of the electronic screen, the OD first supplies a charging voltage higher than the first pixel voltage to charge the pixels of the liquid crystal display panel 104 in the front stage (that is, the period FC in FIG. 2B). Thereafter, the HD maintains a first holding voltage equal to the first pixel voltage during the holding of the sub-picture period to display the liquid crystal The pixel of the panel 104 performs post-stage charging or maintains the potential of the pixel of the liquid crystal display panel 104 at the potential of the first pixel voltage (ie, the period SC in FIG. 2B), and provides the HD during the holding of the sub-picture. The backlight required for the liquid crystal display panel 104.

In this step S205, it is assumed that the highest gray scale resolution of the source driver 103 is 8 bits (but not limited to this assumption), and the first pixel voltage required for the pixels of the liquid crystal display panel 104 corresponds to The 100th grayscale value. Therefore, during the charging and discharging of the electronic picture period OD, the timing controller 101 can cause the source driver 103 to provide a voltage higher than the first pixel voltage (for example, the 120th gray level value) by means of a lookup table. The charging voltage of the corresponding pixel voltage is charged to the pixels of the liquid crystal display panel 104, and the process is to charge the pixels of the liquid crystal display panel 104 in front, so that the pixel can be accelerated. The reaction rate of liquid crystal molecules.

The manner of the above table lookup may define a lookup table through a process of multiple experiments, whereby the timing controller 101 may cause the source driver 103 to provide an appropriate and higher than the first pixel voltage according to the lookup table. The charging voltage is used to charge the pixels of the liquid crystal display panel 104 so that the pixel of the liquid crystal display panel 104 reaches the potential of the first pixel voltage when the OD is charged and discharged during the charging and discharging of the electronic screen. In addition, when the sub-picture period HD is maintained, the timing controller 101 causes the source driver 103 to provide a first holding voltage equipotential to the first pixel voltage to post-charge the pixels of the liquid crystal display panel 104 or The potential of the pixel of the liquid crystal display panel 104 is maintained at the potential of the first pixel voltage.

In this embodiment, when the pixel of the liquid crystal display panel 104 is electrically located When the OD does not reach the potential of the first pixel voltage during the charging and discharging of the electronic screen, the source driver 103 charges the pixel of the liquid crystal display panel 104 again while maintaining the first holding voltage provided by the HD during the sub-screen period. The process of charging the pixel of the liquid crystal display panel 104 is reversed; otherwise, when the pixel of the pixel of the liquid crystal display panel 104 is located at the potential of the first pixel voltage during the charging and discharging of the electronic image, the source The first holding voltage supplied from the pole driver 103 during the holding of the sub-picture period HD maintains the potential of the pixels of the liquid crystal display panel 104 at the potential of the first pixel voltage. In this way, the liquid crystal molecules of the pixels can be stabilized.

In addition, when the pixel of the liquid crystal display panel 104 is to be discharged, the operation as described in step S207 is performed, and the second pixel voltage required by the pixel of the liquid crystal display panel 104 is charged and discharged. During the electronic picture period, the OD first supplies a discharge voltage lower than the second pixel voltage to perform front-end discharge on the pixels of the liquid crystal display panel 104 (that is, the period FC in FIG. 2B). Thereafter, the second holding voltage equipotential to the second pixel voltage is further supplied during the holding of the sub-picture period to perform post-discharge of the pixels of the liquid crystal display panel 104 or maintain the potential of the pixels of the liquid crystal display panel 104. The backlight of the liquid crystal display panel 104 is provided at the potential of the second pixel voltage (i.e., the period SC in Fig. 2B) and during the holding of the sub-picture.

In this step S207, it is assumed that the highest gray scale resolution of the source driver 103 is 8 bits (but not limited to this assumption), and the second pixel voltage required for the pixels of the liquid crystal display panel 104 corresponds to The 100th grayscale value. Therefore, the timing controller 101 can also cause the source driver 103 to provide a voltage lower than the second pixel voltage (for example, the 80th grayscale value corresponds to the OD) during the charging and discharging of the electronic screen period OD. The discharge voltage of the pixel voltage is discharged to the pixels of the liquid crystal display panel 104, and the process is to discharge the pixels of the liquid crystal display panel 104, thereby speeding up the liquid crystal molecules of the pixels. reaction speed.

The above manner of looking up the table can also define a lookup table through a process of multiple experiments, whereby the timing controller 101 can cause the source driver 103 to provide an appropriate lower voltage than the second pixel according to the lookup table. The discharge voltage is discharged to the pixel of the liquid crystal display panel 104, so that the pixel of the liquid crystal display panel 104 reaches a potential close to the second pixel voltage when the OD is charged and discharged during the charging and discharging of the electronic screen. In addition, when the sub-picture period HD is maintained, the timing controller 101 causes the source driver 103 to provide a second holding voltage equipotential to the second pixel voltage to perform post-discharge of the pixels of the liquid crystal display panel 104 or The potential of the pixel of the liquid crystal display panel 104 is maintained at the potential of the second pixel voltage.

In this embodiment, when the pixel of the liquid crystal display panel 104 is located at the potential of the second pixel voltage during the charging and discharging of the electronic screen, the source driver 103 provides the HD during the holding of the sub-picture period. The second holding voltage discharges the pixels of the liquid crystal display panel 104 again, and the process is to perform the post-discharge of the pixels of the liquid crystal display panel 104. Conversely, when the pixels of the liquid crystal display panel 104 are located at the above charging and discharging When the OD has reached the potential of the second pixel voltage described above during the electronic picture, The second sustain voltage supplied from the source driver 103 during the holding of the sub-picture period HD maintains the potential of the pixel of the liquid crystal display panel 104 at the potential of the second pixel voltage. In this way, the liquid crystal molecules of the pixels can be stabilized.

Therefore, according to the above, the timing controller 101 causes the backlight module 105 to provide the backlight required by the liquid crystal display panel 104 during the holding of the sub-picture. Therefore, when the liquid crystal molecules of the pixels have been turned to the angle and are in a stable state, the image of the liquid crystal display 100 is not flickered, and the picture quality thereof is also improved. In addition, it should be understood by those of ordinary skill in the art that the backlight type required for the liquid crystal display panel 104 is a blinking or flash backlight, and thus the backlight module 105 is a flashing backlight module.

In addition, the backlight required for the liquid crystal display panel 104 is not limited to a blinking backlight, and may be a color sequential backlight. Therefore, the backlight module 105 may also be a color sequential backlight module. Due to the driving method of the color sequential method, one screen period is first divided into three sub-picture periods. If the picture update rate is 60 Hz, the sub-picture update rate of the color-sequence method is 180 Hz, so that the liquid crystal display panel displays a sub-image. The time required for the screen is 1/180 second, and the three sub-images displayed on the LCD display will not constitute the original image (ie 1/180 second + 1/180 second + 1/180 seconds). ). In addition, the driving method of the liquid crystal display 100 using the color sequential backlight may refer to the description of the foregoing embodiment, and will not be described again.

However, the spirit of the present invention is not limited to the implementation of the above embodiments, and another liquid crystal display drive will be exemplified below. The method of operation is known to those of ordinary skill in the art.

3 is a flow chart of a driving method of a liquid crystal display according to another embodiment of the present invention. Referring to FIG. 1 to FIG. 3, the driving method of the liquid crystal display of the embodiment includes the following steps. First, as shown in step S301, the display area of the liquid crystal display panel 104 is divided into multiple regions. In this step S301, assuming that the resolution of the liquid crystal display panel 104 is 1024*768, and is divided into three regions (but not limited to this assumption), the pixel representing the first column to the 256th column is a region. The pixels from column 257 to column 512 are one region, and the pixels from column 513 to column 768 are one region.

Next, as described in step S303, one picture period F of each area pixel is divided into at least one charge and discharge electronic picture period OD and one hold sub-picture period HD. The step S303 is similar to the technical effect of the step S201 of the previous embodiment, and the difference is that the step S201 of the previous embodiment is based on the pixels of the full-surface liquid crystal display panel 104, and the steps of the embodiment are S303 is a pixel in a certain area of the liquid crystal display panel 104, that is, one of the pixels in the above three regions, and the related description thereof will not be repeated here.

Then, as described in step S305, it is sequentially determined that each region of the pixel is to be charged or discharged. In step S305, the timing controller 101 knows the state in which the pixels in each zone are to be charged or discharged according to the received video signals. Thereby, the timing controller 101 controls the source driver 103 to generate a corresponding pixel voltage to supply pixels in each zone for charging or discharging.

In this embodiment, when the pixels in the Nth region (assuming that the pixels in the first column to the 256th column are in the region) are to be charged, the operation as described in step S307 is performed, that is, according to the Nth a first pixel voltage required for the pixel in the region, and a first charging voltage higher than the first pixel voltage is first supplied during the charging and discharging of the electronic image to charge the pixel in the Nth region (also That is, the period FC in Fig. 2B). Thereafter, the HD maintains a first holding voltage equipotential to the first pixel voltage during the holding sub-picture period to post-charge the pixels in the N-th region or maintain the potential of the pixels in the N-th region at the The potential of a pixel voltage (i.e., period SC in Figure 2B), and the first backlight required for the pixels in the Nth region is provided during the holding of the sub-picture, where N is a positive integer.

In this step S307, it is assumed that the highest grayscale resolution of the source driver 103 is 8 bits (but not limited to this assumption), and the pixels of the first column to the 256th column are required in the region. The first pixel voltage corresponds to the 100th grayscale value. Therefore, during the charging and discharging of the electronic picture period OD, the timing controller 101 can cause the source driver 103 to provide a voltage higher than the first pixel voltage (for example, the 120th grayscale value corresponding to the 120th grayscale value). The first charging voltage of the pixel voltage is charged in the pixels in the first column to the 256th column pixel, and the process is to perform the pixels in the first column to the 256th column pixel. The front section is charged, so that the reaction speed of the liquid crystal molecules of the pixels can be accelerated.

The manner of the above table lookup may define a lookup table through a process of multiple experiments, whereby the timing controller 101 may cause the source driver 103 to provide an appropriate and higher than the first pixel voltage according to the lookup table. First a charging voltage for charging the front pixels of the pixels in the first column to the 256th column, so that the pixels in the first column to the 256th column are in the OD during the charging and discharging of the electronic image. The potential close to the first pixel voltage described above can be reached. In addition, when the sub-screen period HD is maintained, the timing controller 101 causes the source driver 103 to supply the first holding voltage equipotential to the first pixel voltage to the first column to the 256th column pixel. The pixels in the region are post-charged or the potential of the pixels in the first column to the 256th column of pixels is maintained at the potential of the first pixel voltage.

In this embodiment, when the electric power of the pixels in the first column to the 256th column is located at the potential of the first pixel voltage during the charging and discharging of the electronic picture, the source driver 103 is in the holder. During the picture, the first hold voltage provided by HD will charge the pixels in the first column to the 256th column, and the process is the picture of the first column to the 256th column. The latter is charged in the back stage.

On the other hand, when the electric power of the pixels in the first column to the 256th column is located at the potential of the first pixel voltage during the charging and discharging of the electronic screen, the source driver 103 maintains the sub-picture period during the HD period. The first holding voltage is supplied to maintain the potential of the pixels in the first column to the 256th column of pixels in the potential of the first pixel voltage. In this way, the liquid crystal molecules of the pixels can be stabilized. Moreover, the timing controller 101 causes the backlight module 105 to provide the first backlight required for the pixels in the first column to the 256th column of the pixels during the holding of the sub-picture.

In this embodiment, when the pixels in the Nth region (assuming that the pixels in the first column to the 256th column are in the region) are to be discharged, steps are performed. The operation described in S309, that is, the second pixel voltage required for the pixels in the Nth region, and the first discharge voltage lower than the second pixel voltage is first provided during the charging and discharging of the electronic image. The front segment discharge is performed on the pixels in the Nth region (i.e., the period FC in Fig. 2B). Thereafter, the second holding voltage equipotential to the second pixel voltage is further supplied during the holding of the sub-picture period to perform post-discharge of the pixels in the N-th region or to maintain the potential of the pixels in the N-th region at the The potential of the two pixel voltage (i.e., period SC in Fig. 2B), and the first backlight required for the pixels in the Nth region is provided during the holding of the sub-picture HD.

In this step S309, it is assumed that the highest grayscale resolution of the source driver 103 is 8 bits (but not limited to this assumption), and the pixels of the first column to the 256th column are required in the region. The first pixel voltage corresponds to the 100th grayscale value. Therefore, the timing controller 101 can also cause the source driver 103 to provide a voltage lower than the second pixel voltage (for example, the 80th grayscale value corresponds to the OD) during the charging and discharging of the electronic screen period OD. The first discharge voltage of the pixel voltage is discharged to the pixels in the first column to the 256th column pixel, and the process is the pixel in the first column to the 256th column pixel. The front discharge is performed, which can also speed up the reaction speed of the liquid crystal molecules of the pixels.

The above manner of looking up the table can also define a lookup table through a process of multiple experiments, whereby the timing controller 101 can cause the source driver 103 to provide an appropriate lower voltage than the second pixel according to the lookup table. The first discharge voltage is used to discharge the front pixels of the pixels in the first column to the 256th column, thereby making the first column to the 256th column of pixels When the internal picture is OD during the charging and discharging of the electronic picture, the potential close to the second pixel voltage can be reached. In addition, when the sub-screen period HD is maintained, the timing controller 101 causes the source driver 103 to provide a second holding voltage equipotential to the second pixel voltage to the first column to the 256th column pixel. The pixels in the region perform post-discharge or maintain the potential of the pixels in the first column to the 256th column of pixels in the potential of the second pixel voltage.

In this embodiment, when the electric power of the pixels in the first column to the 256th column is located at the potential of the second pixel voltage during the charging and discharging of the electronic screen, the source driver 103 is in the holder. The second holding voltage provided by the HD during the picture will be discharged again to the pixels in the first column to the 256th column of pixels, and the process is the painting of the first column to the 256th column. The element is discharged in the latter stage.

On the other hand, when the electric power of the pixels in the first column to the 256th column is located at the potential of the second pixel voltage during the charging and discharging of the electronic screen, the source driver 103 holds the sub-picture period during the HD period. The second holding voltage is supplied to maintain the potential of the pixels in the first column to the 256th column of pixels in the potential of the second pixel voltage. In this way, the liquid crystal molecules of the pixels can be stabilized. Moreover, the timing controller 101 causes the backlight module 105 to provide the first backlight required for the pixels in the first column to the 256th column of the pixels during the holding of the sub-picture.

Then, after providing the first backlight required for the pixels in the first column to the 256th column, the driving method of the liquid crystal display of the embodiment will continue to the pixels of the 257th column to the 512th column. The pixels in one zone and the pixels in the 513th to 768th columns are charged or discharged. The process of charging or discharging is similar to the process of charging or discharging the pixels in the first column to the 256th column of pixels. Therefore, those having ordinary knowledge in the field of the present invention refer to the above columns 1 to 256 columns of pixels. After charging or discharging the pixels in this area, it is possible to classify the pixels in the 257th to 512th pixels and the pixels in the 513th to 768th columns for charging or discharging. The process, so I won't go into details here.

Therefore, according to the above, the timing controller 101 causes the backlight module 105 to sequentially supply the pixels in the first column to the 256th column, the pixels in the 257th column to the 512th column in the period of maintaining the sub-screen. The pixels in one zone, and the three backlights required for the pixels in the 513th column to the 768th column. Therefore, when the liquid crystal molecules of the pixels have been turned to the angle and are in a stable state, the image of the liquid crystal display 100 is not flickered, and the picture quality thereof is also improved. In addition, it should be understood by those of ordinary skill in the art that the backlight type required for the liquid crystal display panel 104 is a scanning backlight, and thus the backlight module 105 is a scanning backlight module.

In addition, the backlight type required for the liquid crystal display panel 104 is not limited to a scanning type backlight, and may be a color sequential backlight. Therefore, the backlight module 105 is a color sequential backlight module. In addition, the color sequential backlight is driven by dividing a screen period into three sub-picture periods, and scanning each of the sub-picture periods separately. For the driving method of the liquid crystal display 100 using the color sequential backlight, reference may be made to the description of the foregoing embodiments, and the description thereof will not be repeated.

In summary, the driving method of the liquid crystal display proposed by the present invention, It mainly divides one picture period into at least two sub-picture periods (that is, the time when each column of pixels is turned on is divided into at least two periods), and provides high/lower pixels to be received during one of the sub-picture periods. The charging/discharging voltage of the pixel voltage is used for the pixels, and during the other sub-pixels, a holding voltage equal to the pixel voltage that the pixel should originally receive is supplied to the pixel. Thereby, the liquid crystal molecules of the pixels can be turned to the angles of the pixels in the time when each column of pixels is turned on, and can be in a stable state, so that the image of the liquid crystal display provided by the invention not only does not flicker. And its picture quality will also improve.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100‧‧‧LCD display

101‧‧‧ timing controller

102‧‧‧gate driver

103‧‧‧Source Driver

104‧‧‧LCD panel

105‧‧‧Backlight module

S201~S207‧‧‧ steps of the flow chart of the driving method of the liquid crystal display according to an embodiment of the present invention

F‧‧‧Screen period

OD‧‧‧During the electronic screen

HD‧‧‧During the sprite period

FC‧‧‧Previous period of charge and discharge

SC‧‧‧After the period of retention

S301~S309‧‧‧ respective steps of the driving method of the liquid crystal display according to another embodiment of the present invention

FIG. 1 is a system architecture diagram of a general liquid crystal display 100.

2A is a flow chart showing a driving method of a liquid crystal display according to an embodiment of the invention.

2B is a timing chart showing driving of a liquid crystal display according to an embodiment of the invention.

3 is a flow chart of a driving method of a liquid crystal display according to another embodiment of the present invention.

S201~S207‧‧‧ steps of the flow chart of the driving method of the liquid crystal display according to an embodiment of the present invention

Claims (11)

A driving method of a liquid crystal display, comprising the steps of: dividing a picture period into at least one charging and discharging electronic image period and a holding sub-picture period; and determining that a pixel of a liquid crystal display panel is to be charged or discharged, wherein: when the liquid crystal When the pixel of the display panel is to be charged, a charging voltage higher than the first pixel voltage is first provided during the charging and discharging of the electronic image according to a first pixel voltage required by the pixel of the liquid crystal display panel. And charging a pixel of the liquid crystal display panel in a front stage, and then providing a first holding voltage equal to the first pixel voltage during the holding sub-picture period to perform a pixel on the pixel of the liquid crystal display panel Charging or maintaining the potential of the pixel of the liquid crystal display panel at the potential of the first pixel voltage, and providing a backlight required for the liquid crystal display panel during the holding sub-picture; and when the liquid crystal display panel is painted When a discharge is desired, a second pixel voltage required by the pixels of the liquid crystal display panel is provided, and is provided during the charging and discharging of the electronic image. And discharging a pixel of the liquid crystal display panel with a discharge voltage of the second pixel voltage, and then providing a second holding voltage equal to the potential of the second pixel voltage during the holding sub-picture period, Performing a post-discharge of the pixel of the liquid crystal display panel or maintaining the potential of the pixel of the liquid crystal display panel at a potential of the second pixel voltage, and providing the liquid crystal display panel during the holding sub-picture period Backlight. The driving side of the liquid crystal display as described in claim 1 The method, wherein the pixel of the liquid crystal display panel is charged or discharged by using a timing controller according to at least one image signal received by the timing controller. The driving method of the liquid crystal display according to claim 1, wherein the backlight is a blinking backlight. The method of driving a liquid crystal display according to claim 1, wherein the screen period is a screen update rate of the liquid crystal display. A driving method of a liquid crystal display, comprising the steps of: dividing a display area of a liquid crystal display panel into a plurality of areas; dividing a picture period of each display area into at least one charging and discharging electronic screen period and a holding sub-picture period; and sequentially Determining that each region of the pixel is to be charged or discharged, wherein: when the pixel in the Nth region is to be charged, according to a first pixel voltage required for the pixel in the Nth region, during the charging and discharging of the electronic image Providing a first charging voltage higher than the first pixel voltage to charge the pixel in the Nth region, and then providing a first hold of the potential of the first pixel voltage during the holding sub-picture period The voltage is used to charge the pixel in the Nth region or to maintain the potential of the pixel in the Nth region at the potential of the first pixel voltage, and to provide a first pixel in the Nth region during the holding of the sub-picture. a backlight, wherein N is a positive integer; and when the pixel in the Nth region is to be discharged, according to a second pixel voltage required for the pixel in the Nth region, the first pixel voltage is provided during the charging and discharging of the electronic image A first discharge voltage to the second pixel voltage to the first N region The inner pixel performs a front-end discharge, and then provides a second hold voltage equal to the potential of the second pixel voltage during the hold sub-picture to perform a post-discharge of the pixel in the N-th region or a potential of the pixel in the N-th region. The potential of the second pixel voltage is maintained, and the first backlight required for the pixels in the Nth region is provided during the holding sub-picture. The driving method of the liquid crystal display according to claim 5, wherein after the first backlight required for providing the pixels in the Nth region, the method further comprises the following steps: when the (N+1) region is desired When charging, according to a third pixel voltage required in the (N+1)th region pixel, a second charging voltage higher than the third pixel voltage is first provided during the charging and discharging of the electronic image to Performing a front-end charging on the (N+1)-region pixel, and then providing a third holding voltage equipotential to the third pixel voltage during the holding sub-picture period to the pixel in the (N+1)th region Performing post-stage charging or maintaining the potential of the pixel in the (N+1)th region at the potential of the third pixel voltage, and providing a second required for the pixel in the (N+1)th region during the holding sub-picture period a backlight; and when the pixel in the (N+1)th region is to be discharged, a fourth pixel voltage required according to the pixel in the (N+1)th region is provided, and the low voltage is provided during the charging and discharging of the electronic image. And a second discharge voltage of the fourth pixel voltage, for performing a front discharge on the pixel in the (N+1)th region, and then in the holder And providing a fourth holding voltage equal to the potential of the fourth pixel voltage to perform post-discharge of the pixel in the (N+1)th region or to maintain the potential of the pixel in the (N+1)th region The potential of the fourth pixel voltage, and during the hold sub-picture The second backlight required for the (N+1)th region pixel is provided. The method for driving a liquid crystal display according to claim 6, wherein the pixel in each zone is charged or discharged by a timing controller according to at least one image signal received by the timing controller. The driving method of the liquid crystal display according to claim 6, wherein the first backlight and the second backlight constitute a scanning type backlight. The driving method of the liquid crystal display according to claim 6, wherein the screen period is a screen update rate of the liquid crystal display. A liquid crystal display comprising: a liquid crystal display panel for displaying a corresponding image frame during a picture; a backlight module for providing a backlight; and a gate driver for driving the liquid crystal display panel; And a timing controller coupled to the liquid crystal display panel, the backlight module, the gate driver, and the source driver for controlling the gate driver and the source And the backlight module, wherein the picture period is divided into at least one charging and discharging electronic picture period and a holding sub-picture period, the timing controller determines that the pixel of the liquid crystal display panel is to be charged or discharged, when the timing control When the pixel of the liquid crystal display panel is to be charged, the timing controller is required according to the pixel of the liquid crystal display panel. a first pixel voltage, and during the charging and discharging of the electronic image, controlling the source driver to first supply a charging voltage higher than the first pixel voltage to the liquid crystal display panel to perform front view on the pixel of the liquid crystal display panel Charging, after the timing controller causes the source driver to provide a first holding voltage equal to the first pixel voltage during the holding of the sub-picture to post-charge the pixels of the liquid crystal display panel or The potential of the pixel of the liquid crystal display panel is maintained at the potential of the first pixel voltage, and the timing controller controls the backlight module to provide the backlight required for the liquid crystal display panel during the holding sub-picture, and when When the timing controller determines that the pixel of the liquid crystal display panel is to be discharged, the timing controller controls the source during the charging and discharging electronic screen according to a second pixel voltage required by the pixel of the liquid crystal display panel. The pole driver first supplies a discharge voltage lower than the second pixel voltage to the liquid crystal display panel to discharge the front pixel of the liquid crystal display panel. The timing controller causes the source driver to provide a second holding voltage equal to the potential of the second pixel voltage during the holding of the sub-picture to perform post-discharge of the pixel of the liquid crystal display panel or display the liquid crystal display The potential of the pixel of the panel is maintained at the potential of the second pixel voltage, and the timing controller controls the backlight module to provide the backlight required for the liquid crystal display panel during the holding sub-picture. A liquid crystal display comprising: a liquid crystal display panel for displaying a corresponding image frame during a picture; a backlight module for providing a first backlight; a gate driver for driving the liquid crystal display panel; a source driver for driving the liquid crystal display panel; and a timing controller coupled to the liquid crystal The display panel, the backlight module, the gate driver, and the source driver are configured to control the gate driver, the source driver, and the backlight module, wherein the display area of the liquid crystal display panel is divided into multiple regions. And the period of the screen is divided into at least one charging and discharging electronic screen period and a holding sub-picture period, the timing controller sequentially determines that the pixel of the liquid crystal display panel is to be charged or discharged, and when the timing controller determines the painting in the Nth region When the charging is desired, the timing controller controls the source driver to provide a voltage higher than the first pixel voltage during the charging and discharging of the electronic picture according to a first pixel voltage required by the pixels in the Nth region. a first charging voltage is applied to the liquid crystal display panel to charge the pixels in the Nth region in a front stage, and then the timing controller causes the source driving during the holding of the sub-picture And providing a first holding voltage equal to the potential of the first pixel voltage to post-charge the pixel in the Nth region or maintain the potential of the pixel in the Nth region at the potential of the first pixel voltage, and the The timing controller controls the backlight module to provide the first backlight required for the pixels in the Nth region during the holding of the sub-picture, wherein N is a positive integer, and when the timing controller determines that the pixel in the Nth region is to be discharged When the timing controller is based on a second pixel voltage required for the pixels in the Nth region, Controlling, by the source driver, a first discharge voltage lower than the second pixel voltage to the liquid crystal display panel during the charging and discharging of the electronic image to discharge the pixel in the Nth region, and then the timing controller During the holding of the sub-picture, the source driver is further provided with a second holding voltage equipotential to the second pixel voltage to perform post-discharge of the pixels in the N-th region or to maintain the potential of the pixels in the N-th region. The potential of the second pixel voltage, and the timing controller controls the backlight module to provide the first backlight required for the pixel in the Nth region during the holding sub-picture.