TWI711031B - Method for controlling polarity of each subpixels of display panel by using pattern detection manner - Google Patents

Abstract

A method for controlling polarity of each subpixels of a display panel by using a pattern detection manner is provided. The method includes the following steps: receiving image data of each subpixels of the display panel, in which the image data of the subpixels corresponds to an image pattern displayed on the display panel; performing the pattern detection manner to determine whether the image pattern is a killer pattern which induces occurrence of horizontal stripes on the display panel; employing a 1-column inversion method to drive the display panel when the image pattern is not the killer pattern; and employing a 2-column inversion method to drive the display panel when the image pattern is the killer pattern.

Description

Method for controlling the polarity of each sub-pixel of a display panel by using pattern detection method

The embodiment of the disclosure relates to a pattern detection method, and more particularly to a method of controlling the polarity of each sub-pixel of a display panel by using the pattern detection method.

Polarity inversion is a common technique used in liquid crystal display panels to eliminate image retention caused by long-term DC bias of liquid crystals. However, when the polarity inversion is used to make the positive and negative polarities of the voltage applied to the liquid crystal inverted every frame, horizontal stripes may be caused due to the withstand voltage limit of the electrode drive circuit (horizontal stripes) defect occurs.

The purpose of this disclosure is to provide a method for controlling the polarity of each sub-pixel of a display panel by using a pattern detection method, including: Collect the image data of each sub-pixel of the display panel, where the image data corresponds to the image pattern displayed on the display panel; execute the pattern detection method to determine whether the image pattern is a killer pattern that causes horizontal stripes on the display panel. pattern); when the image pattern is not a killer pattern, use the 1-column inversion method to drive the display panel; and when the image pattern is a killer pattern, use the 2-column inversion method (2-column inversion method) to drive the display panel.

In some embodiments, when the single-row inversion driving method is used to drive the display panel, the polarities of the sub-pixels in each column of the display panel are repeatedly arranged in the order of "+, -, +, -" polarity; When the display panel is driven by the double-row inversion driving method, the polarities of the sub-pixels in each column of the display panel are repeatedly arranged in the order of "+, -, -, +" polarity.

In some embodiments, the above-mentioned pattern detection method includes: setting the failure count to 0; performing judgment processing on the sub-pixels in the i-th column and the i+1-th column of the display panel, where i=1,2,... ,N-1, where N is the number of columns of the display panel; when the failure count is less than N/4, the image pattern is determined to be a killer pattern; and when the failure count is not less than N/4, the image pattern is determined not to be a killer pattern. The above determination processing includes: determining the brightness hue of each sub-pixel in the i-th column and the i+1-th column as bright, mid-tone, or dark hue; determining the brightness hue of the sub-pixels of the first four pixels in the i-th column Whether the order is the same as the brightness hue order of the sub-pixels of the other four pixels in the i-th column; determine whether the brightness hue order of the sub-pixels of the first four pixels in the i+1-th column is the same as the i+1-th column The brightness tone sequence of the brightness tone of the other four-pixel sub-pixels; the brightness tone change judgment processing is performed to determine the i-th column and Whether the brightness hue of the sub-pixels in the i+1th column causes horizontal stripes; and when the brightness hue order of the first four-pixel sub-pixels in the i-th column is different from that of the other four-pixel sub-pixels in the i-th column When the brightness tone sequence of the hue, or when the brightness tone sequence of the brightness tone of the sub-pixels of the first four pixels in the i+1th column is different from the brightness tone sequence of the brightness tone of the sub-pixels of the other four pixels in the i+1th column When the brightness hue of the sub-pixels in the i-th column and the i+1-th column does not cause horizontal stripes, the failure count is increased by 1.

In some embodiments, the brightness tone of the sub-pixel is determined by comparing the grayscale value of the sub-pixel with the light threshold and the dark threshold; wherein when the grayscale value of the sub-pixel is greater than the light threshold, the sub-pixel is determined The brightness tone of the pixel is a bright tone; when the grayscale value of the sub-pixel is less than the dark threshold, the brightness tone of the sub-pixel is determined to be a dark tone; where the grayscale value of the sub-pixel is not greater than the light threshold and not less than the dark threshold Value, determine the sub-pixel's brightness tones as midtones.

In some embodiments, the following steps are used to determine whether the brightness tone sequence of the sub-pixels of the first four pixels in the i-th column is the same as the brightness tone sequence of the sub-pixels of the other four pixels in the i-th column : Set the first difference count to 0; perform the first comparison process on the sub-pixels of the first four pixels in the i-th column and the j-th four-pixel sub-pixels in the i-th column, where j=2,3,... .,M/4, where M is the number of rows of the display panel; when the first dissimilarity count is less than 7, it is determined that the brightness tones of the first four pixels of the i-th column are the same as the other ones in the i-th column The brightness tone sequence of the brightness tone of the sub-pixels of the four pixels. The above-mentioned first comparison processing includes: determining whether the luminance tones of the sub-pixels of the first four pixels in the i-th column have different luminance tones in order The brightness hue order of the sub-pixels of the j-th four-pixel in the i-th column; and when the brightness hue order of the sub-pixels of the first four pixels in the i-th column is different from the j-th four in the i-th column In the case of the brightness tone sequence of the brightness tone of the sub-pixels of the pixel, the first difference count is increased by one.

In some embodiments, the following steps are used to determine whether the brightness tone sequence of the sub-pixels of the first four pixels in the i+1th column is the same as the brightness tone of the other four-pixel sub-pixels in the i+1th column Luminance hue order: set the second difference count to 0; perform the second comparison process on the sub-pixels of the first four pixels in the i+1th column and the j-th four-pixel sub-pixels in the i+1th column, where j=2,3,...,M/4, where M is the number of rows of the display panel; when the second dissimilarity count is less than 7, determine the brightness and hue of the first four pixels of the i+1th column The brightness tone sequence is the same as the brightness tone sequence of the sub-pixels of the other four pixels in the i+1th column. The above-mentioned second comparison processing includes: determining whether the brightness hue order of the sub-pixels of the first four pixels in the i+1th column is different from the brightness hue of the sub-pixels of the jth four-pixel in the i+1th column Hue sequence; and when the brightness hue order of the brightness hue of the sub-pixels of the first four pixels in the i+1th column is different from the brightness hue order of the brightness hue of the sub-pixels of the jth four-pixel in the i+1th column, the The second difference count is incremented by one.

In some embodiments, the above-mentioned brightness hue change determination processing includes: setting the change count to 0; performing change processing on the kth sub-pixel in the i-th column and the k-th sub-pixel in the i+1th column, where k=1, 2,...,12; when at least two of the change count of the i-th column, the change count of the i-1th column, and the change count of the i-2th column are greater than the change threshold, determine the i-th column and Column i+1 The brightness tones of the sub-pixels cause horizontal stripes to appear. The above-mentioned change processing includes: determining whether the brightness and hue of the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column are bright and dark; and when the k-th sub-pixel in the i-th column and the i-th sub-pixel are When the brightness tone of the k-th sub-pixel in the +1 column is a bright tone or a dark tone, the change count is increased by one.

In some embodiments, the above-mentioned pattern detection method includes: setting the failure count to 0; performing judgment processing on the sub-pixels in the i-th column and the i+1-th column of the display panel, where i=1,2,... ,N-1, where N is the number of columns of the display panel; when the failure count is less than N/4, the image pattern is determined to be a killer pattern; and when the failure count is not less than N/4, the image pattern is determined not to be a killer pattern. The above determination processing includes: determining the brightness hue of each sub-pixel in the i-th column and the i+1-th column as bright, mid-tone, or dark hue; determining the brightness hue of the sub-pixels of the first four pixels in the i-th column Whether the order is the same as the brightness hue order of the sub-pixels of the other four pixels in the i-th column; determine whether the brightness hue order of the sub-pixels of the first four pixels in the i+1-th column is the same as the i+1-th column The brightness tone sequence of the brightness tone of the other four-pixel sub-pixels; determine whether the brightness tone of the sub-pixel in the i-th column matches a specific pattern; and the brightness tone sequence of the sub-pixels of the first four pixels in the i-th column When it is different from the brightness tone sequence of the brightness tone of the sub-pixels of the other four pixels in the i-th column, or when the brightness tone sequence of the sub-pixels of the first four pixels in the i+1-th column is different from that of the i+1-th column When the brightness tones of the other four-pixel sub-pixels are in the order of brightness tones, or when the brightness tones of the sub-pixels in the i-th column do not match the specific pattern, the failure count is increased by one.

In some embodiments, the brightness tone of the sub-pixel is determined by comparing the grayscale value of the sub-pixel with the light threshold and the dark threshold; wherein when the grayscale value of the sub-pixel is greater than the light threshold, the sub-pixel is determined The brightness tone of the pixel is a bright tone; when the grayscale value of the sub-pixel is less than the dark threshold, the brightness tone of the sub-pixel is determined to be a dark tone; where the grayscale value of the sub-pixel is not greater than the light threshold and not less than the dark threshold Value, determine the sub-pixel's brightness tones as midtones.

In some embodiments, a touch and display driver integration (TDDI) driving method is used to drive the display panel.

In order to make the above-mentioned features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

1000‧‧‧Polar control method

1100, 1200, 1210, 1220, 1230, 1240, 1250, 1300, 1400‧‧‧ steps

From the following detailed description in conjunction with the accompanying drawings, a better understanding of the aspect of the disclosure can be obtained. It should be noted that, according to industry standard practices, each feature is not drawn to scale. In fact, in order to make the discussion clearer, the size of each feature can be increased or decreased arbitrarily.

[Fig. 1] is a flowchart of a polarity control method according to an embodiment of the disclosure.

[FIG. 2A] is an example for explaining that the image pattern is a killer pattern and the single-line inversion driving method is used to drive the display panel according to the embodiment of the disclosure.

[FIG. 2B] is an example for explaining that the image pattern is a killer pattern and the display panel is driven by a two-line inversion driving method according to an embodiment of the disclosure.

[Fig. 3] is a flowchart of a pattern detection method according to an embodiment of the disclosure.

[Fig. 4] is an example of four specific patterns according to the embodiment of the present disclosure.

The following is a detailed description of the embodiments with the accompanying drawings, but the provided embodiments are not used to limit the scope of the present invention, and the description of the structure and operation is not used to limit the order of its execution, any recombination of components The structure and the devices with equal effects are all within the scope of the present invention.

FIG. 1 is a flowchart of a polarity control method 1000 according to an embodiment of the disclosure. The polarity control method 1000 controls the polarity of each sub-pixel of the display panel by using a pattern detection method. As shown in FIG. 1, the polarity control method 1000 includes steps 1100, 1200, 1300, and 1400. In step 1100, the image data of each sub-pixel of the display panel is received. In some embodiments of the present disclosure, the image data corresponds to the image pattern to be displayed on the display panel in the next frame following the current frame. In step 1200, a pattern detection method is performed to determine whether the image pattern to be displayed on the display panel in the next frame is a killer pattern that causes horizontal stripes to appear on the display panel.

When the image pattern is not a killer pattern, use it in the next frame The display panel is driven by a 1-column inversion method (step 1300). In some embodiments of the present disclosure, when the single-row inversion driving method is used to drive the display panel, the multiple polarities of the multiple sub-pixels in each column of the display panel are repeated in the polarity of "+, -, +, -" In order. Specifically, the default driving method of the display panel is the single-line inversion driving method, that is, the column inversion driving method. Therefore, when the image pattern to be displayed on the display panel in the next frame is not a killer pattern, the display panel It is still driven by a single-line inversion driving method to eliminate the image retention problem caused by the long-term DC bias of the liquid crystal.

When the image pattern is a killer pattern, a 2-column inversion method is used to drive the display panel in the next frame, that is, step 1400. In some embodiments of the present disclosure, when the display panel is driven by the dual-row inversion driving method, the multiple polarities of the multiple sub-pixels in each column of the display panel are repeated in "+, -, -, +" Arranged in order of polarity. Specifically, when the image pattern to be displayed on the display panel in the next frame is a killer pattern, the driving method of the display panel is changed to the two-line inversion driving method in the next frame to avoid the display panel in the next frame. Causes stripes to appear.

FIG. 2A is an example for explaining that the image pattern is a killer pattern and the single-line inversion driving method is used to drive the display panel according to the embodiment of the disclosure. As shown in Figure 2A, the multiple polarities and multiple grayscale values of the multiple sub-pixels in the i-th column are repeatedly arranged in the order of "+255,-0,+255,-0", and the i+1th column Multiple polarities and multiple grayscale values of multiple sub-pixels are repeated Arrange in the order of "+0,-255,+0,-255". Therefore, for the electrode driving circuit, the multiple voltage changes in each row from the i-th column to the i+1-th column are all extremely negative values (for example, from +255 to +0, or from -0 to -255), so that the withstand voltage of the electrode drive circuit is overloaded and causes horizontal stripes to appear on the display panel.

FIG. 2B is an example for explaining that the image pattern is a killer pattern and the display panel is driven by a two-line inversion driving method according to an embodiment of the disclosure. As shown in Figure 2B, the multiple polarities and multiple grayscale values of the multiple sub-pixels in the i-th column are repeatedly arranged in the order of "+255,-0,-255,+0", and the i+1th column The multiple polarities and multiple grayscale values of the multiple sub-pixels are repeatedly arranged in the order of "+0, -255, -0, +255". Therefore, for the electrode drive circuit, the multiple voltage changes in each row from the i-th column to the i+1-th column include extremely negative values (for example, from +255 to +0, or from -0 to- 255) and an extremely positive value (for example, changing from -255 to -0, or from +0 to +255), and the extremely negative value and the extremely positive value can also cancel each other out, thereby reducing the electrode drive circuit Load and avoid causing horizontal stripes on the display panel.

The pattern detection method in step 1200 of the polarity control method 1000 is further discussed below. FIG. 3 is a flowchart of the pattern detection method in step 1200 according to an embodiment of the disclosure. As shown in FIG. 3, the pattern detection method in step 1200 includes steps 1210, 1220, 1230, 1240, and 1250. In step 1210, the failed count is set to 0. In step 1220, the multiple sub-pixels in the i-th column and the i+1-th column of the display panel are judged Interrupt processing, where i=1,2,...,N-1, where N is the total number of columns of pixels included in the display panel. In step 1230, it is determined whether the failure count is less than N/4. When the failure count is not less than N/4, it is determined that the image pattern is not a killer pattern, that is, step 1240. When the failure count is less than N/4, it is determined that the image pattern is a killer pattern, that is, step 1250.

The judgment processing of step 1220 according to the first embodiment of the present disclosure is further discussed below. The judgment processing of step 1220 in the first embodiment of the disclosure includes a first sub-step, a second sub-step, a third sub-step, a fourth sub-step, and a fifth sub-step. In the first sub-step, it is determined whether the brightness tone of each sub-pixel in the i-th column and the i+1-th column is a bright tone, an intermediate tone or a dark tone. In some embodiments of the present disclosure, the brightness and hue of the sub-pixel are determined by comparing the gray level value of the sub-pixel with the light threshold and the dark threshold. When the grayscale value of the sub-pixel is greater than the light threshold, it is determined that the brightness tone of the sub-pixel is a bright tone. When the grayscale value of the sub-pixel is less than the dark threshold, it is determined that the brightness tone of the sub-pixel is a dark tone. When the grayscale value of the sub-pixel is not greater than the light threshold and not less than the dark threshold, it is determined that the brightness tone of the sub-pixel is a mid-tone. For example, if the light threshold value is 240 and the dark threshold value is 15, then the brightness tone of the sub-pixel with a grayscale value of 255 is determined to be a bright tone; the brightness tone of a sub-pixel with a grayscale value of 0 is determined to be dark Hue; the brightness hue of a sub-pixel with a grayscale value of 100 is determined as a mid-tone.

In the second sub-step, it is determined whether the brightness hue sequence of the first four pixel sub-pixels in the i-th column is the same as the brightness hue sequence of the other four-pixel sub-pixels in the i-th column. In the third sub-step, confirm Whether the brightness tone order of the brightness tone of the sub-pixels of the first four pixels in the i+1th column is the same as the brightness tone order of the brightness tone of the sub-pixels of the other four pixels in the i+1th column. In the fourth sub-step, the brightness hue change determination process is executed to determine whether the brightness hue of the sub-pixels in the i-th column and the i+1-th column cause horizontal stripes.

In the fifth sub-step, when the brightness hue sequence of the first four pixel sub-pixels in the i-th column is different from the brightness hue sequence of the other four-pixel sub-pixels in the i-th column, or when the When the brightness tone sequence of the sub-pixels of the first four pixels in the +1 column is different from the brightness tone sequence of the sub-pixels of the other four pixels in the i+1th column, or when the i-th column and the i+th column When the brightness tone of the sub-pixels in one column does not cause horizontal stripes, the failure count is increased by one.

Specifically, the first sub-step, the second sub-step, the third sub-step, the fourth sub-step, and the fifth sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure are from i=1 to i =N-1 Repeat the operation to determine the failure count.

The second sub-step of the judgment processing in step 1220 according to the first embodiment of the present disclosure is further discussed below. The second sub-step of the judgment processing of step 1220 in the first embodiment of the present disclosure includes the first step, the second step, and the third step. In the first step, set the first dissimilarity count to 0. In the second step, perform the first comparison process on the sub-pixels of the first four pixels in the i-th column and the j-th four-pixel sub-pixels in the i-th column, where j=2,3,...,M/4 , Where M is the total number of rows of pixels included in the display panel. In the third step, when the first dissimilarity count is less than 7, the first four pixels of the i-th column are determined The brightness tone sequence of the brightness tone of the pixel is the same as the brightness tone sequence of the brightness tone of the sub-pixels of the other four pixels in the i-th column.

The third sub-step of the judgment processing in step 1220 according to the first embodiment of the present disclosure is further discussed below. The third sub-step of the judgment processing of step 1220 in the first embodiment of the disclosure includes the fourth step, the fifth step, and the sixth step. In the fourth step, set the second dissimilarity count to 0. In the fifth step, the second comparison process is performed on the sub-pixels of the first four pixels in the i+1th column and the j-th four-pixel sub-pixels in the i+1th column, where j=2,3,... ,M/4, where M is the total number of rows of pixels included in the display panel. In the sixth step, when the second dissimilarity count is less than 7, it is determined that the brightness hue order of the first four pixels of the i+1th column is the same as that of the other four pixels of the i+1th column The order of the brightness tones of the brightness tones.

The following further discusses the first comparison process of the second step of the second sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure. The first comparison process of the second step of the second sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure includes two steps. First, it is determined whether the luminance tone order of the luminance tone of the sub-pixels of the first four pixels in the i-th column is different from the luminance tone order of the luminance tone of the sub-pixels of the j-th four-pixel in the i-th column. Next, when the brightness tone sequence of the sub-pixels of the first four pixels in the i-th column is different from the brightness tone sequence of the sub-pixels of the j-th four-pixel in the i-th column, the first difference count is added 1. Specifically, according to the first comparison process of the second step of the second sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure, the operation is repeated from j=2 to j=M/4 to determine The first difference count.

The second comparison process of the fifth step of the third sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure is further discussed below. The second comparison process of the fifth step of the third substep of the judgment process of step 1220 in the first embodiment of the present disclosure includes two steps. First, it is determined whether the luminance tone order of the luminance tone of the sub-pixels of the first four pixels in the i+1th column is different from the luminance tone order of the luminance tone of the sub-pixels of the jth four-pixel in the i+1th column. Next, when the brightness tone sequence of the sub-pixels of the first four pixels in the i+1th column is different from the brightness tone sequence of the sub-pixels of the jth four-pixel in the i+1th column, the second The difference count is incremented by 1. Specifically, according to the second comparison process of the fifth step of the third sub-step of the judgment process of step 1220 in the first embodiment of the present disclosure, the operation is repeated from j=2 to j=M/4 to determine The second difference count.

The following further discusses the brightness hue change determination processing in the fourth sub-step of the determination processing in step 1220 of the first embodiment of the disclosure. The brightness and hue change determination processing in the fourth sub-step of the determination processing in step 1220 of the first embodiment of the present disclosure includes a seventh step, an eighth step, and a ninth step. In the seventh step, set the change count to 0. In the eighth step, change processing is performed on the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column, where k=1,2,...,12. In the ninth step, when at least two of the change count of the i-th column, the change count of the i-1th column, and the change count of the i-2th column are greater than the change threshold, the i-th column and the i-th column are determined The brightness tone of the sub-pixels in the +1 column will cause horizontal stripes. Specifically, the situation where the change count of the i-th column is greater than the change threshold means that there is a large brightness hue change between the i-th column and the i+1th column, and the change count of the i-1th column is greater than the change threshold. The shape represents that there is a large change in brightness and hue between the i-1th column and the i-th column, and the change count of the i-2th column is greater than the change threshold, which means that it is between the i-2th column and the i-1th column There is a large change in brightness tones. Therefore, the ninth step is to determine whether the large brightness hue change between two adjacent columns has occurred more than twice in the four adjacent columns (ie from the i-2th column to the i+1th column). .

The following further discusses the change processing of the eighth step of the brightness hue change determination processing of the fourth substep of the determination processing of step 1220 in the first embodiment of the present disclosure. In the first embodiment of the disclosure, the fourth sub-step of the determination process of step 1220 in the first embodiment of the disclosure includes two steps. First, it is determined whether the brightness tones of the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column are bright tones and dark tones. Next, when the brightness tones of the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column are bright and dark, the change count is increased by one. Specifically, the change processing of the eighth step of the brightness hue change determination processing of the fourth sub-step of the determination processing of step 1220 of the first embodiment of the present disclosure is repeated from k=1 to k=12, In order to determine the change count of the i-th column.

The judgment processing of step 1220 according to the second embodiment of the present disclosure is further discussed below. The judgment processing of step 1220 in the second embodiment of the present disclosure includes a first sub-step, a sixth sub-step, a seventh sub-step, an eighth sub-step, and a ninth sub-step. Regarding the first substep, it has been described in detail in the above discussion, so it will not be repeated here.

In the sixth sub-step, it is determined whether the brightness hue order of the first four pixels in the i-th column is exactly the same as the other ones in the i-th column. The brightness tone sequence of the brightness tone of the sub-pixels of the four pixels. In the seventh sub-step, it is determined whether the brightness hue order of the first four pixels of the i+1th column is exactly the same as the brightness hue order of the other four pixels of the i+1th column .

In the eighth sub-step. It is determined whether the brightness hue of the sub-pixel in the i-th column matches the brightness hue of the i-th column of the specific pattern. In the second embodiment of the present disclosure, it is known that some specific patterns will cause horizontal stripes to appear on the display panel. FIG. 4 is an example of four specific patterns according to the second embodiment of the present disclosure (ie, pattern 1, pattern 2, pattern 3, and pattern 4 as shown in FIG. 4). The left part of Fig. 4 shows the polarities of multiple sub-pixels of the first four pixels. The “+” in Fig. 4 represents the voltage polarity of the sub-pixel is positive, and the “-” in Fig. 4 represents the sub-pixel’s The voltage polarity is negative. The right part of Figure 4 shows the brightness tones of multiple sub-pixels of the first four pixels, where "0" in Figure 4 represents that the sub-pixel's brightness tones are dark, and "1" in Figure 4 represents the sub-pixel The brightness tone of is bright tone. Among them, "R1" in Figure 4 represents the red sub-pixel of the first pixel, where "G2" in Figure 4 represents the green sub-pixel of the second pixel, and "B4" in Figure 4 represents the blue sub-pixel of the fourth pixel. Pixels, and so on.

In the ninth sub-step, when the brightness hue sequence of the first four pixel sub-pixels in the i-th column is not exactly the same as the brightness hue sequence of the other four-pixel sub-pixels in the i-th column, or When the brightness tone sequence of the sub-pixels of the first four pixels in the i+1th column is not exactly the same as the brightness tone sequence of the sub-pixels of the other four pixels in the i+1th column, or when the The brightness and hue of the sub-pixels in column i do not match For the brightness hue of the i-th column of the specific pattern, add 1 to the failure count.

Specifically, the first, sixth, seventh, eighth, and ninth sub-steps of the judgment processing of step 1220 in the second embodiment of the present disclosure are from i=1 to i =N-1 Repeat the operation to determine the failure count.

In some embodiments of the present disclosure, a touch and display driver integration (TDDI) driving method is used to drive the display panel.

In summary, the present disclosure proposes a method for controlling the polarity of each sub-pixel of the display panel by using a pattern detection method. The present disclosure uses a pattern detection method to determine whether the image pattern to be displayed on the display panel in the next frame is a killer pattern that causes horizontal stripes on the display panel. When the image pattern is not a killer pattern, a single-line inversion driving method is used to drive the display panel in the next frame to eliminate the afterimage problem caused by the long-term DC bias of the liquid crystal. When the image pattern is a killer pattern, the two-line inversion driving method is used to drive the display panel in the next frame, so as to prevent the display panel from causing horizontal stripes in the next frame.

The features of several embodiments are summarized above, so those who are familiar with the art can better understand the aspect of the disclosure. Those who are familiar with the art should understand that they can easily use the present disclosure as a basis to design or modify other processes and structures, thereby achieving the same goals and/or the same advantages as the embodiments described herein. . Those who are familiar with this art should also understand that these equivalent constructions do not depart from the spirit and scope of this disclosure, and they can make various changes, substitutions and alterations without departing from the spirit and scope of this disclosure.

1000‧‧‧Polar control method

1100, 1200, 1300, 1400‧‧‧step

Claims (10)

A method for controlling the polarity of each of a plurality of sub-pixels of a display panel by using a pattern detection method includes: receiving an image data of each of the sub-pixels of the display panel, wherein the image data is Corresponding to an image pattern displayed on the display panel; execute the pattern detection method to determine whether the image pattern is a killer pattern that causes horizontal stripes on the display panel; when the image pattern is not When the killer pattern is used, a 1-column inversion method is used to drive the display panel; and when the image pattern is the killer pattern, a 2-column inversion method is used to drive the display panel. ) To drive the display panel. For the method described in claim 1, wherein when the single-row inversion driving method is used to drive the display panel, the polarities of the sub-pixels in each column of the display panel are repeated with "+, -, The polarities of +,-" are arranged in order; wherein when the display panel is driven by the dual-row inversion driving mode, the polarities of the sub-pixels in each column of the display panel are repeated as "+, -, -, +" is arranged in order of polarity. The method described in item 1 of the scope of patent application, wherein the pattern detection method includes: Set a failure count to 0; perform a judgment process on the sub-pixels in the i-th column and the i+1-th column of the display panel, where i=1,2,...,N-1, where N is The number of columns of the display panel, wherein the determination processing includes: determining a brightness tone of each of the sub-pixels in the i-th column and the i+1-th column as a bright tone, a mid-tone or a dark tone; and determining the i-th column Whether a brightness tone sequence of the brightness tones of the first four pixels of the sub-pixels in the column is the same as a brightness tone sequence of the brightness tones of the sub-pixels of the other four pixels in the i-th column; determine the i+th Whether a brightness tone sequence of the brightness tones of the first four pixels of the sub-pixels in a column is the same as a brightness tone sequence of the brightness tones of the sub-pixels of the other four pixels in the i+1th column; execute; A brightness hue change determination process to determine whether the brightness hue of the sub-pixels in the i-th column and the i+1-th column cause horizontal stripes; and when the sub-pixels of the first four pixels in the i-th column When the brightness hue sequence of the brightness hue is different from the brightness hue sequence of the sub-pixels of the other four pixels in the i-th column, or when the sub-pixels of the first four pixels in the i+1-th column When the brightness tone sequence of the brightness tones of the i+1th column is different from the brightness tone sequence of the brightness tones of the other four pixels of the i+1th column, or when the ith column and the i+1th column When the brightness tones of the sub-pixels do not cause horizontal stripes, the failure count is increased by 1; When the failure count is less than N/4, it is determined that the image pattern is the killer pattern; and when the failure count is not less than N/4, it is determined that the image pattern is not the killer pattern. The method described in item 3 of the scope of patent application, wherein the brightness hue of the sub-pixel is determined by comparing a gray level value of the sub-pixel with a light threshold and a dark threshold; When the grayscale value of the pixel is greater than the bright threshold, the brightness tone of the sub-pixel is determined to be the bright tone; wherein when the grayscale value of the subpixel is less than the dark threshold, the brightness of the subpixel is determined The hue is the dark hue; wherein when the grayscale value of the sub-pixel is not greater than the light threshold and not less than the dark threshold, it is determined that the brightness hue of the sub-pixel is the midtone. The method described in item 3 of the scope of patent application, wherein the following steps are used to determine whether the brightness hue order of the brightness tones of the first four pixels in the i-th column is the same as the other four in the i-th column The brightness hue sequence of the brightness tones of the sub-pixels of the pixel: set a first dissimilarity count to 0; for the sub-pixels of the first four pixels in the i-th column and the j-th four in the i-th column The sub-pixels of the pixel perform a first comparison process, where j=2,3,...,M/4, where M is the number of rows of the display panel, and the first comparison process includes: Determine whether the brightness tone sequence of the brightness tones of the first four pixels of the i-th column is different from the brightness tone sequence of the brightness tones of the sub-pixels of the j-th four pixel of the i-th column And when the brightness hue sequence of the brightness tones of the first four pixels of the i-th column is different from the brightness hue of the sub-pixels of the j-th four pixels of the i-th column In order, the first dissimilarity count is increased by 1; and when the first dissimilarity count is less than 7, it is determined that the brightness hue order of the brightness hue of the first four pixels of the i-th column is the same as The brightness tone sequence of the brightness tones of the sub-pixels of the other four pixels in the i-th column. For the method described in item 3 of the scope of patent application, the following steps are used to determine whether the brightness hue order of the brightness tones of the first four pixels of the i+1th column is the same as that of the i+1th row The brightness hue sequence of the brightness tones of the sub-pixels of the other four pixels in the column: set a second difference count to 0; for the sub-pixels of the first four pixels of the i+1th column and the i-th The sub-pixels of the j-th four-pixel in the +1 column perform a second comparison process, where j=2,3,...,M/4, where M is the number of rows of the display panel, and the second The comparison processing includes: determining the brightness of the sub-pixels of the first four pixels in the i+1th column Whether the brightness hue sequence of the degree hue is different from the brightness hue sequence of the brightness hue of the sub-pixels of the jth four pixels of the i+1th column; and when the brightness hue sequence of the first four pixels of the i+1th column When the brightness tone sequence of the brightness tones of the sub-pixels is different from the brightness tone sequence of the brightness tones of the j-th four pixels in the i+1th column, the second difference is counted Add 1; and when the second dissimilarity count is less than 7, it is determined that the brightness tones of the sub-pixels of the first four pixels in the i+1th column have the same brightness hue order as the other four in the i+1th column The brightness tone sequence of the brightness tones of the sub-pixels of the pixel. The method described in item 3 of the scope of patent application, wherein the brightness and hue change judgment processing includes: setting a change count to 0; performing the kth sub-pixel in the i-th column and the k-th sub-pixel in the i+1th column A change process, where k=1,2,...,12, where the change process includes: determining whether the brightness tones of the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column are The bright tone and the dark tone; and when the brightness tones of the k-th sub-pixel in the i-th column and the k-th sub-pixel in the i+1-th column are the bright tone and the dark tone, the change count is increased by 1 ;as well as When at least two of the change count in the i-th column, the change count in the i-1th column, and the change count in the i-2th column are greater than a change threshold, the i-th column and the i+1-th column are determined The brightness tones of the sub-pixels in the column will cause horizontal stripes to appear. According to the method described in claim 1, wherein the pattern detection method includes: setting a failure count to 0; performing a judgment on the sub-pixels in the i-th row and the i+1-th row of the display panel Processing, where i=1,2,...,N-1, where N is the number of columns of the display panel, and the judgment processing includes: determining each of the sub-pixels in the i-th column and the i+1-th column A brightness hue of is a bright hue, a midtone or a dark hue; it is determined whether the order of the brightness hue of the first four pixels of the i-th column of the sub-pixels is the same as the other four pixels of the i-th column A brightness hue order of the brightness tones of the sub-pixels of the sub-pixels; determining whether the brightness hue sequence of the brightness tones of the first four pixels of the i+1th column is the same as that of the i+1th column A brightness tone sequence of the brightness tones of the sub-pixels of the other four pixels; determining whether the brightness tones of the sub-pixels of the i-th column match a specific pattern; and when the first four pixels of the i-th column The order of the brightness tones of the sub-pixels is different from that of the other four pixels in the i-th column. When the brightness tones of the brightness tones of the sub-pixels are in the order of the brightness tones, or when the brightness tones of the first four pixels of the i+1th column are different from those of the i+1th column When the brightness tones of the sub-pixels of the other four pixels are in the order of the brightness tones, or when the brightness tones of the sub-pixels in the i-th column do not match the specific pattern, the failure count is increased by 1 ; When the failure count is less than N/4, the image pattern is determined to be the killer pattern; and when the failure count is not less than N/4, the image pattern is determined not to be the killer pattern. The method described in item 8 of the scope of patent application, wherein the brightness hue of the sub-pixel is determined by comparing a gray level value of the sub-pixel with a light threshold and a dark threshold; When the grayscale value of the pixel is greater than the bright threshold, the brightness tone of the sub-pixel is determined to be the bright tone; wherein when the grayscale value of the subpixel is less than the dark threshold, the brightness of the subpixel is determined The hue is the dark hue; wherein when the grayscale value of the sub-pixel is not greater than the light threshold and not less than the dark threshold, it is determined that the brightness hue of the sub-pixel is the midtone. The method described in item 1 of the scope of patent application, wherein a touch and display driver integration (Touch and Display Driver Integration, TDDI) driving method is used to drive the display surface board.

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