Patent Grant
11798512
This application claims the benefit of priority of Chinese Application No. 202211358259.4 6 filed on Nov. 1, 2022. The contents of the above applications are all incorporated by reference as if fully set forth herein in their entirety.
The present application relates to a field of display technology, and in particular, to a display panel.
As a frame rate and a resolution of display screen continue to be improved, the closer to the last few lines of the display screen, the less time left for a liquid crystal to respond. It will lead to insufficient sub-pixel charging rate and make the display screen appear trailing when a respond time of the liquid crystal is less than a time required for the liquid crystal to flip.
In order to overcome the above defects, the currently technology proposes an over driver technology to make the liquid crystal in a shorter period of time to achieve a desired deflection target. Over driver technology is based on a principle that if a drive voltage is only provided to the target gray level, due to a slow response speed of the liquid crystal flip, the target gray scale cannot actually be achieved when a data signal on a data line needs to be switched from a current gray level to a target gray level. However, the over driver technology will provide a greater difference in the driving voltage corresponding to the current gray level, thus accelerating a speed of the LCD flip to achieve the actual target gray level we need, therefore a color shift problem can be solved.
However, although the over driver technology improves the gray level response time, it does not improve a response time for switching between black screen and white screen.
The present application provides a display device to improve a response time for switching between a black screen and a white screen.
The present application provides a display device including:
Optionally, in some embodiments of the present application, the display device is configured to adopt the first driving mode within one frame when a difference between a first gray scale value of a current frame and a second gray scale value of the next frame is less than a set threshold;
Optionally, in some embodiments of the present application, the first gray scale value is an average of gray scale values of last N rows of sub-pixels of the current frame, and wherein the second gray scale value is an average of gray scale values of last N rows of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the first gray scale value is a median of gray scale values of last N rows of sub-pixels of the current frame, and wherein the second gray scale value is a median of gray scale values of last N rows of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the first gray scale value is a gray scale value with a most occurrences in gray scale values of last N rows of sub-pixels of the current frame, and wherein the second gray scale value is a gray scale value with a most occurrences in gray scale values of last N rows of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the preset gray scale voltage is a voltage value corresponding to an average of gray scale values of last N rows of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the preset gray scale voltage is a voltage value corresponding to a gray scale value with a most occurrences in gray scale values of last N rows of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the first driving mode includes: writing scanning signals to the scanning lines line by line within the next frame, inputting a target gray scale voltage of the next frame to 1st to M-Nth rows sub-pixels through the data lines, and inputting an overdrive voltage to M-Nth to Mth rows sub-pixels, wherein an absolute value of the overdrive voltage is greater than an absolute value of a target gray scale voltage of M-Nth to Mth rows sub-pixels of the next frame, wherein M is a total number of rows of sub-pixels, and wherein N and M are positive integers.
Optionally, in some embodiments of the present application, the second driving mode includes: writing scanning signals to the scanning lines line by line within the second time period of the next frame, inputting a target gray scale voltage of the next frame to 1st to M-Nth rows sub-pixels through the data lines, and inputting an overdrive voltage to M-Nth to Mth rows sub-pixels, wherein an absolute value of the overdrive voltage is greater than an absolute value of a target gray scale voltage of M-Nth to Mth rows sub-pixels of the next frame, wherein M is a total number of rows of sub-pixels, and wherein N and M are positive integers.
Optionally, in some embodiments of the present application, N is less than or equal to an integer part of M/2, wherein M is a total number of rows of sub-pixels, and wherein M is a positive integer.
Optionally, in some embodiments of the present application, the second driving mode includes: inputting the preset gray scale voltage to each column of the sub-pixels respectively through the data lines, and wherein the preset gray scale voltage is a voltage value corresponding to a gray scale value with a most occurrences in each column of sub-pixels of the next frame.
Optionally, in some embodiments of the present application, the second driving mode includes: inputting the preset gray scale voltage to each column of the sub-pixels respectively through the data lines, and wherein the preset gray scale voltage is a voltage value corresponding to an average of the gray scale values of each column of the sub-pixels of the next frame.
The present application provides a display device, wherein the display device includes: a plurality of scanning lines provided along a first direction; a plurality of data lines provided along a second direction, wherein the plurality of scanning lines and the plurality of data lines crossing each other and enclosing a plurality of pixel regions, wherein each the pixel region is provided with a sub-pixel, and wherein the sub-pixel is electrically connected to the scanning line and the data line, respectively; a first driving mode including: writing scanning signals line by line to the plurality of scanning lines within a next frame and inputting a gray scale voltage of the next frame to the sub-pixels through the data lines; and a second driving mode including: writing scanning signals to all the plurality of scanning lines simultaneously within a first time period of the next frame and inputting a preset gray scale voltage to the sub-pixels through the plurality data lines, and writing scanning signals to the plurality of scanning lines line by line within a second time period of the next frame and inputting the gray scale voltage of the next frame to the sub-pixels through the data lines, wherein the first time period is adjacent to the second time period. The display device is configured to adopt one of the first driving mode and the second driving mode within one frame. In the present application, in the second driving mode, the preset gray scale voltage is input to the sub-pixel within the first time period of one frame, thereby increasing the liquid crystal flipping speed within one frame, and therefore improving a response time of the display device in switching between a black screen and a white screen.
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly describe the accompanying figures that need to be used in the description of the embodiments. It is obvious that the accompanying figures in the following description are only some embodiments of the present application, and other accompanying figures can be obtained according to these figures without inventive step for those skilled in the art.
The following will be a clear and complete description of the technical solutions in the embodiments of the present application in combination with the accompanying figures in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without inventive step shall fall within a protection scope of the present application.
In the description of the present application, it is understood that the terms “top”, “bottom”, “front”, “back”, “left”, “right”, “inside”, “outside”, etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the accompanying figures and are intended only to facilitate and simplify the description of the present application, not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms “first” and “second” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying a number of technical features indicated. Thus, the features “first” and “second” may explicitly or implicitly include one or more of the described features. In the description of the present application, “plurality” means two or more, unless otherwise expressly and specifically limited.
The present application provides a display device, which is described in detail below. It should be noted that an order in which the following embodiments are described is not intended to limit a preferred order of embodiments of the present application.
Referring to
In the present application, in the second driving mode, a preset gray scale voltage is input to the sub-pixels 40 within the first time period of a frame, and the preset gray scale voltage enables all the sub-pixels 40 of the display device 100 to be charged to a certain voltage in advance before the sub-pixels 40 are scanned line by line, thus increasing a liquid crystal flipping speed of one frame, and therefore a response time of the display device 100 in switching between black and white screens can be improved.
Further, in some embodiments, the display device 100 is configured to adopt the first driving mode within one frame when a difference between a first gray scale value of a current frame and a second gray scale value of the next frame is less than a set threshold; wherein the display device 100 is configured to adopt the second driving mode within the next frame when the difference between the first gray scale value of the current frame and the second gray scale value of the next frame is greater than or equal to the set threshold; and wherein an absolute value of the preset gray scale voltage is greater than an absolute value of a voltage value corresponding the first gray scale value when the absolute value of the voltage value corresponding the first gray scale value is less than an absolute value of a voltage value corresponding the second gray scale value, and wherein the absolute value of the preset gray scale voltage is less than the absolute value of the voltage value corresponding the first gray scale value when the absolute value of the voltage value corresponding the first gray scale value is greater than the absolute value of the voltage value corresponding the second gray scale value.
Referring to
Specifically, in some embodiments, the setting threshold is greater than or equal to 32, i.e., the preset gray scale voltage is input to the sub-pixel 40 within the first time period of the next frame when the difference between the first gray scale value and the second gray scale value is greater than or equal to 32. Further, the setting threshold can be set according to actual needs.
That is, if the difference between the luminance of the current frame and the luminance of the next frame is greater, a difference between a gray scale value of the current frame and a gray scale value of the next frame is also greater. Therefore, a transition between the current frame and the next frame will result in the charging voltage of the sub-pixel 40 does not reach the target gray scale voltage due to insufficient charging time. For the above situation, the present application inputs a preset gray scale voltage to all sub-pixels 40 during the first time period of the next frame when a value of the difference is greater than or equal to the set threshold, and the absolute value of the preset gray scale voltage is greater than the absolute value of the voltage value corresponding to the first gray scale value when the absolute value of the voltage value corresponding to the first gray scale value is less than the absolute value of the voltage value corresponding to the second gray scale value. The absolute value of the preset gray scale voltage is less than the absolute value of the voltage value corresponding to the first gray scale value when the absolute value of the voltage value corresponding to said first gray scale value is greater than the absolute value of the voltage value corresponding to the second gray scale value, and the gray scale voltage of the next frame is input to the sub-pixel 40 within the second time period of the next frame. Since the preset gray scale voltage is input to the sub-pixel 40 in advance, thereby it is possible to reduce the difference between the gray scale value of the sub-pixel 40 and the gray scale value of the next frame within the next frame time, thus reducing a charging time of the sub-pixels 40 and thus improving the response time, in particular improving a response time of the transition between the black screen and the white screen.
The gray scale value of the next frame is input to the sub-pixel 40 during the first time period and the second time period of the next frame when the difference is less than the set threshold. Specifically, since the difference between the gray scale value of the current frame and the next frame is not significant, the target gray scale voltage of the next frame is input to the sub-pixel 40 within the first time period and the second time period of the next frame, and also the overdrive voltage can be input to the sub-pixel 40 during the first time period and the second time period of the next frame. The target gray scale voltage is a voltage required to charge the sub-pixel 40 to reach the target luminance when displaying the frame. The target gray scale voltage is determined based on the gamma curve used by the display device and the pre-written correspondence between gray scale and voltage. The overdrive voltage is greater than the target gray scale voltage of the sub-pixel 40, causing the liquid crystal corresponding to the sub-pixel 40 to be deflected quickly so that the voltage of the sub-pixel 40 can be charged to the target gray scale voltage using a shorter charging time. The gray scale voltage of the next frame is also determined based on the gamma curve used by the display device and the pre-written correspondence between gray scale and voltage.
Referring to
Referring to
In some embodiments, the first gray scale value is an average of the gray scale values of last N rows of sub-pixels 40 of the current frame, and the second gray scale value is an average of the gray scale values of last N rows of sub-pixels 40 of the next frame.
In some embodiments, the first gray scale value is a median of gray scale values of last N rows of sub-pixels 40 of the current frame, and the second gray scale value is a median of gray scale values of last N rows of sub-pixels 40 of the next frame.
In some embodiments, the first gray scale value is a gray scale value with a most occurrences in gray scale values of last N rows of sub-pixels 40 of the current frame, and the second gray scale value is a gray scale value with a most occurrences in gray scale values of last N rows of sub-pixels 40 of the next frame. The first gray scale value is any one of a plurality of gray scale values with a most occurrences in the gray scale values of last N rows of sub-pixels 40 of the current frame when there are the plurality of gray scale values with the most occurrences in the gray scale values of last N rows of sub-pixels 40 of the current frame. The second gray scale value is any one of a plurality of gray scale values with a most occurrences in the gray scale values of last N rows of sub-pixels 40 of the next frame when there are the plurality of gray scale values with the most occurrences in the gray scale values of last N rows of sub-pixels 40 of the next frame. The first gray scale value and the second gray scale value both use the gray scale values with the a most occurrences.
In some embodiments, the preset gray scale voltage is a voltage value corresponding to an average of gray scale values of last N rows of sub-pixels 40 of the next frame. The preset gray scale voltage adopts the voltage value corresponding to the average allows for a small difference in the time for each sub-pixel 40 of last N rows of sub-pixels 40 of the next frame to charge to reach the target gray scale voltage.
In some embodiments, the preset gray scale voltage is a voltage value corresponding to a gray scale value with a most occurrences of gray scale values of last N rows of sub-pixels 40 of the next frame. The preset gray scale voltage adopts the voltage value corresponding to the gray scale value with the most occurrences, which means that some sub-pixels 40 in last N rows of sub-pixels 40 of the next frame can reach the target gray scale voltage directly without recharging, which helps to improve a response time of some sub-pixels 40.
In some embodiments, the preset gray scale voltage is a voltage value corresponding to a median of the gray scale values of last N rows of sub-pixels 40 of the next frame. The preset gray scale voltage adopts a voltage value corresponding to the median, which can make the time for each sub-pixel 40 of last N rows of sub-pixels 40 of the next frame to charge to reach the target gray scale voltage not significantly different.
In some embodiments, the first driving mode includes: writing scanning signals to the scanning lines 10 line by line within the next frame, inputting a target gray scale voltage of the next frame to 1st to M-Nth rows sub-pixels 40 through the data lines 20, and inputting an overdrive voltage to M-Nth to Mth rows sub-pixels 40, wherein an absolute value of the overdrive voltage is greater than an absolute value of a target gray scale voltage of M-Nth to Mth rows sub-pixels 40 of the next frame, wherein M is a total number of rows of sub-pixels 40, and wherein N and M are positive integers.
Since a liquid crystal response time corresponding to last N rows of sub-pixels 40 of the next frame is less than a liquid crystal response time corresponding to the other rows of sub-pixels 40 of one frame, charging last N rows of sub-pixels 40 of the next frame by using the overdrive voltage is beneficial to reduce the liquid crystal response time corresponding to last N rows of sub-pixels 40 of the next frame, thereby further improving the display device 100 response time. In another embodiment, the first driving mode may also include: inputting the target gray scale voltage of the next frame to 1st to Mth rows sub-pixels 40 within the next frame. M is the total number of rows of sub-pixels 40 and M is a positive integer. That is, the target gray scale voltage for the next frame is input directly to all sub-pixels 40 within the next frame, without over-voltage driving.
In some embodiments, N is less than or equal to an integer part of M/2. M is a total number of rows of sub-pixels 40. M is a positive integer. Since in all rows of sub-pixels 40, last M/2 rows of sub-pixels 40 will have insufficient charging time, taking N to be an integer part of M/2 ensures that the liquid crystal corresponding to all sub-pixels 40 can be deflected quickly. Specifically, in this embodiment, N is equal to an integer part of M/2.
In some embodiments, the second driving mode includes: writing scanning signals to the scanning lines 10 line by line within the second time period of the next frame, inputting a target gray scale voltage of the next frame to 1st to M-Nth rows sub-pixels 40 through the data lines 20, and inputting an overdrive voltage to M-Nth to Mth rows sub-pixels 40, wherein an absolute value of the overdrive voltage is greater than an absolute value of a target gray scale voltage of M-Nth to Mth rows sub-pixels 40 of the next frame, wherein M is a total number of rows of sub-pixels 40, and wherein N and M are positive integers.
That is, the present application first inputs the preset gray scale voltage to the sub-pixels 40 in the first time period of the next frame when the difference is greater than or equal to the set threshold, and the absolute value of the preset gray scale voltage is greater than the absolute value of the first gray scale value corresponding voltage value when the absolute value of the first gray scale value corresponding voltage value is less than the absolute value of the second gray scale value corresponding voltage value. The absolute value of the preset gray scale voltage is less than the absolute value of the voltage value corresponding to the first gray scale value when the absolute value of the first gray scale value corresponding voltage value is greater than the absolute value of the voltage value corresponding to the second gray scale value. During the second time period of the next frame adjacent to the first time period, the target gray scale voltage of the next frame is input to 1st to M-Nth rows sub-pixels 40, and the overdrive voltage is input to M-Nth to Mth rows sub-pixels 40, the absolute value of the overdrive voltage is greater than the absolute value of the target gray scale voltage of M-Nth to Mth rows sub-pixels 40 of the next frame. M is the total number of rows of sub-pixels 40 and M is a positive integer.
Since the liquid crystal response time corresponding to last N rows of sub-pixels 40 of the next frame is less than the liquid crystal response time corresponding to the other rows of sub-pixels 40 of the next frame, charging last N rows of sub-pixels 40 of the next frame by using the overdrive voltage is conducive to reduce the liquid crystal response time corresponding to last N rows of sub-pixels 40 of the next frame, thereby further improving the response time of the display device 100.
In another embodiment, the second driving mode may also include: In the second time period adjacent to the first time period of the next frame, input the target gray scale voltage of the next frame to 1st to M-Nth rows sub-pixels 40. M is the total number of rows of sub-pixels 40, and M is a positive integer. That is, the target gray scale voltage of the next frame is directly input to all the sub-pixels 40 in the second time period, without over-voltage driving.
Referring to
S10, obtaining a first gray scale value of a current frame and a second gray scale value of a next frame. The first gray scale value can be an average of the gray scale values of all sub-pixels 40 of the current frame or other gray scale values of the current frame. The first gray scale value can reflect a universal value of the gray scale value of the current frame. The second gray scale value may be an average of the gray scale values of all sub-pixels 40 of the next frame, or may be other gray scale values of the next frame. The second gray scale value can reflect a universal value of the gray scale value of the next frame.
S20, obtaining a difference between the first gray scale value and the second gray scale value according to the first gray scale value and the second gray scale value.
S30, inputting a preset gray scale voltage to sub-pixels 40 within a first time period of the next frame and inputting a gray scale voltage of the next frame to the sub-pixels 40 within a second time period of the next frame when a value of the difference is greater than or equal to the set threshold, wherein the first time period is adjacent to the second time period;
Referring to
Still further, in some embodiments, the step S12, including:
Still further, in some embodiments, the step S12, including:
Referring to
That is, obtaining the gray scale value with the most occurrences among the gray scale values of each column of sub-pixels 40 of the next frame first when the difference is greater than or equal to the set threshold, and then inputting the gray scale value with the most occurrences among the gray scale values of each column of sub-pixels 40 of the next frame to each column of sub-pixels 40 during the first time period of the next frame. Since there may be large differences in gray scale values between sub-pixels 40 in each column of sub-pixels 40 of the next frame, the voltage value corresponding to the gray scale value with the most occurrences in each column of sub-pixels 40 is input to each column of sub-pixels 40 separately, so the voltage value corresponding to the gray scale value with the most occurrences among the gray scale values of each column of sub-pixels 40 is input to each column of sub-pixels 40 separately. Therefore, the charging time of some of the sub-pixels 40 in each column of sub-pixels 40 can be reduced, which is conducive to further improve the response time of the display device 100.
Referring to
That is, the average of the gray scale value of each column of sub-pixels 40 of the next frame is obtained first when the difference is greater than or equal to the set threshold, and then the average of the gray scale value of each column of sub-pixels 40 of the next frame is input to each column of sub-pixels 40 during the first time period of the next frame. Since there may be a large difference in the gray scale values of different columns of sub-pixels 40 of the next frame, the voltage value corresponding to the average value of the gray scale value of each column of sub-pixels 40 is input to each column of sub-pixels 40 separately, so that the sub-pixels 40 in each column of sub-pixels 40 are charged to reach the target gray scale voltage in a more uniform time, which is conducive to improving the uniformity of the display
Referring to
A display device 100 provided by the embodiments of the present application has been introduced in detail above. The principles and implementations of the present application are described in this document by using specific examples. The descriptions of the above embodiments are only used to help understand the methods of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation and application scope. In conclusion, a content of this specification should not be construed as a limitation to the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211358259.4 | Nov 2022 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20180053464 | Lu | Feb 2018 | A1 |
| 20200008153 | Yi | Jan 2020 | A1 |
| 20210158861 | Jeong | May 2021 | A1 |
| 20220036841 | Guo | Feb 2022 | A1 |
