CN111816136B

CN111816136B - Liquid crystal display, driving compensation method and driving compensation device thereof

Info

Publication number: CN111816136B
Application number: CN202010792636.XA
Authority: CN
Inventors: 韩启强; 赵博; 洪星智; 李永超
Original assignee: Hefei Eswin IC Technology Co Ltd
Current assignee: Hefei Yisiwei Computing Technology Co ltd
Priority date: 2020-08-09
Filing date: 2020-08-09
Publication date: 2021-11-12
Anticipated expiration: 2040-08-09
Also published as: WO2022033110A1; CN114333725A; CN111816136A; CN114333725B

Abstract

The invention provides a liquid crystal display, a driving compensation method and a driving compensation device thereof, relates to the technical field of liquid crystal display driving, and aims to solve the problem that the display quality of the liquid crystal display is influenced due to the long response time of liquid crystals in the liquid crystal display. The driving compensation method of the liquid crystal display comprises the following steps: acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display; determining first image compensation data corresponding to the current frame image according to the image data of the current frame image to be displayed by the liquid crystal display and the image data of the previous frame image; generating a data signal for writing into each sub-pixel included in the liquid crystal display based on the first image compensation data. The liquid crystal display provided by the invention is used for displaying pictures.

Description

Liquid crystal display, driving compensation method and driving compensation device thereof

Technical Field

The invention relates to the technical field of liquid crystal display driving, in particular to a liquid crystal display, a driving compensation method and a driving compensation device thereof.

Background

The display principle of the liquid crystal display is that different voltages are used for driving the liquid crystal to turn over so as to realize different light transmission amounts, and the light penetrating through the liquid crystal passes through the color filter to be emitted out of the liquid crystal display, so that the display presents colors with different brightness.

Due to the viscosity and elasticity of the liquid crystal itself, the time for the liquid crystal to flip from one state to another is not instantaneous, that is, when the liquid crystal flips from the previous state to the current target state, even if the corresponding voltage is applied, the optical response of the liquid crystal can reach the ideal target state after a certain time, which is the response time. If the response time exceeds the time of one frame (for example, 16.6ms at 60Hz, one frame time), the picture will have a blur.

Therefore, how to shorten the response time of the liquid crystal in the liquid crystal display becomes an urgent problem to be solved.

Disclosure of Invention

The invention aims to provide a liquid crystal display, a driving compensation method and a driving compensation device thereof, which are used for solving the problem that the response time of liquid crystal in the liquid crystal display is longer and the display quality of the liquid crystal display is influenced.

In order to achieve the above purpose, the invention provides the following technical scheme:

a first aspect of the present invention provides a driving compensation method of a liquid crystal display, including:

acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display;

determining first image compensation data corresponding to the current frame image according to the image data of the current frame image to be displayed by the liquid crystal display and the image data of the previous frame image;

generating a data signal for writing into each sub-pixel included in the liquid crystal display based on the first image compensation data.

Optionally, the step of acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display specifically includes:

sequentially receiving image data corresponding to each frame of image, respectively compressing and storing the image data corresponding to each frame of image, and transmitting the image data to a response time compensation module;

the response time compensation module receives image data corresponding to a current frame image and receives image data corresponding to a previous frame image obtained by decompression.

Optionally, the image data corresponding to each frame of image includes initial gray scale data corresponding to each sub-pixel one to one;

the step of determining the first image compensation data corresponding to the current frame image according to the image data of the current frame image and the image data of the previous frame image to be displayed by the liquid crystal display specifically includes:

acquiring first gray scale compensation data of the current frame image corresponding to each sub-pixel from a pre-generated first compensation data table according to initial gray scale data of the current frame image corresponding to each sub-pixel and initial gray scale data of a previous frame image corresponding to each sub-pixel, and generating first image compensation data corresponding to the current frame image according to the first gray scale compensation data corresponding to each sub-pixel;

the abscissa of the index value of the first compensation data table comprises initial gray scale data of a previous frame image corresponding to the sub-pixel, the ordinate of the index value of the first compensation data table comprises initial gray scale data of a current frame image corresponding to the sub-pixel, and the first compensation data table stores first gray scale compensation data corresponding to the index value one by one.

Optionally, the liquid crystal display includes gate lines and data lines arranged in a crossing manner, and a plurality of sub-pixels distributed in an array, where the plurality of sub-pixels include a plurality of rows of sub-pixels corresponding to the data lines one to one, and each sub-pixel in each row of sub-pixels is electrically connected to a corresponding data line;

the step of generating data signals for writing into the sub-pixels comprised by the liquid crystal display based on the first image compensation data comprises:

acquiring the first gray scale compensation data corresponding to each of all adjacent two sub-pixels in the same row of sub-pixels;

according to the first gray scale compensation data corresponding to all the two adjacent sub-pixels, second gray scale compensation data of a first target sub-pixel far away from the starting end of the data line in each two adjacent sub-pixels corresponding to the current frame image are obtained from a pre-generated second compensation data table; the abscissa of the index value of the second compensation data table comprises first gray scale compensation data corresponding to a non-first target sub-pixel in the two adjacent sub-pixels, the ordinate of the index value of the second compensation data table comprises first gray scale compensation data corresponding to the first target sub-pixel in the two adjacent sub-pixels, and second gray scale compensation data corresponding to the index value one by one are stored in the second compensation data table;

and generating a data signal for writing into each first target sub-pixel based on the second gray scale compensation data corresponding to each first target sub-pixel.

Optionally, the plurality of sub-pixels include a plurality of rows of sub-pixels corresponding to the gate lines one to one, and each sub-pixel in each row of the sub-pixels is electrically connected to a corresponding gate line;

the step of generating data signals for writing into the sub-pixels comprised by the liquid crystal display based on the first image compensation data specifically comprises:

acquiring position data corresponding to a second target sub-pixel in the plurality of sub-pixels;

according to the position data corresponding to the second target sub-pixel, obtaining a compensation parameter corresponding to the second target sub-pixel from a pre-generated third compensation data table; the abscissa of the index value of the third compensation data table comprises the abscissa of the second target sub-pixel, the ordinate of the index value of the third compensation data table comprises the ordinate of the second target sub-pixel, and the third compensation data table stores compensation parameters corresponding to the index value one by one;

acquiring second gray scale compensation data corresponding to the second target sub-pixel from the second compensation data table;

and generating a data signal for writing into the second target sub-pixel based on the first gray scale compensation data, the second gray scale compensation data and the compensation parameter corresponding to each second target sub-pixel.

Based on the technical solution of the driving compensation method, a second aspect of the present invention provides a driving compensation apparatus for a liquid crystal display, for implementing the driving compensation method, the driving compensation apparatus comprising: the device comprises an acquisition module, a response time compensation module and a driving module;

the acquisition module is configured to: acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display;

the response time compensation module is configured to: determining first image compensation data corresponding to the current frame image according to the image data of the current frame image to be displayed by the liquid crystal display and the image data of the previous frame image;

the drive module is used for: generating a data signal for writing into each sub-pixel included in the liquid crystal display based on the first image compensation data.

Optionally, the obtaining module specifically includes: the device comprises a receiving module, a compression module, a storage module and a decompression module;

the receiving module is used for sequentially receiving the image data corresponding to each frame of image and respectively transmitting the image data corresponding to each frame of image to the compression module and the response time compensation module;

the compression module is used for compressing the image data corresponding to each frame of image and storing the image data in the storage module;

the decompression module is used for decompressing image data corresponding to the previous frame of image from the storage module and transmitting the image data to the response time compensation module.

the response time compensation module is specifically configured to:

Optionally, the liquid crystal display includes gate lines and data lines arranged in a crossing manner, and a plurality of sub-pixels distributed in an array, where the plurality of sub-pixels include a plurality of rows of sub-pixels corresponding to the data lines one to one, and each sub-pixel in each row of sub-pixels is electrically connected to a corresponding data line; the drive compensation device further includes: an undercharge compensation module;

the under-charge compensation module is used for: acquiring the first gray scale compensation data corresponding to each of all adjacent two sub-pixels in the same row of sub-pixels;

the drive module is specifically configured to: and generating a data signal for writing into each first target sub-pixel based on the second gray scale compensation data corresponding to each first target sub-pixel.

the under-charge compensation module is further configured to: acquiring position data corresponding to a second target sub-pixel in the plurality of sub-pixels;

the drive module is specifically configured to: and generating a data signal for writing into the second target sub-pixel based on the first gray scale compensation data, the second gray scale compensation data and the compensation parameter corresponding to the second target sub-pixel.

Based on the technical solution of the driving compensation device, a third aspect of the present invention provides a liquid crystal display, including the driving compensation device.

According to the technical scheme provided by the invention, the corresponding turning degree of the liquid crystal can be determined when the liquid crystal display is switched from the previous frame image to the current frame image according to the image data of the previous frame image and the image data of the current frame image; and carrying out adaptive compensation on the image data corresponding to the current frame image according to the turnover degree; therefore, after the data signals generated based on the first image compensation data are written into the sub-pixels, the response speed of the liquid crystal can be effectively improved, the response time of the liquid crystal is shortened, and the phenomenon that the liquid crystal display is blurred when the liquid crystal display displays the picture is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a liquid crystal display according to an embodiment of the invention;

fig. 2 is a schematic diagram of a first layout of sub-pixels in a display panel according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a second layout of sub-pixels in the display panel according to the embodiment of the invention;

fig. 4 is a schematic diagram of a third layout of sub-pixels in the display panel according to the embodiment of the present invention;

fig. 5 is a schematic diagram of a fourth layout of sub-pixels in the display panel according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of an image data curve and a liquid crystal response curve before and after compensation according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of a driving compensation apparatus according to an embodiment of the present invention;

fig. 8 is a schematic diagram of image data corresponding to a current frame image and a previous frame image according to an embodiment of the present invention;

FIG. 9 is a diagram illustrating a first compensation data table according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a sub-pixel adjacent to a data line along the extending direction of the data line according to an embodiment of the present invention;

FIG. 11 is a diagram illustrating a second compensation data table according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a row of sub-pixels corresponding to a gate driving module according to an embodiment of the invention;

fig. 13 is a schematic diagram of a row of sub-pixels corresponding to two gate driving modules according to an embodiment of the invention;

fig. 14 is a schematic diagram of a charging curve corresponding to the structure of fig. 12 and 13 according to an embodiment of the present invention;

FIG. 15 is a structural diagram of a third compensation data table;

FIG. 16 is a schematic diagram of bilinear difference upsampling of the third compensation data table;

fig. 17 is a schematic diagram of performing delta up-sampling on the third compensation data table.

Detailed Description

In order to further explain the liquid crystal display, the driving compensation method and the driving compensation device thereof provided by the embodiment of the invention, the following detailed description is made in conjunction with the accompanying drawings of the specification.

The embodiment of the invention provides a driving compensation method of a liquid crystal display, which comprises the following steps:

Specifically, referring to fig. 1, fig. 1 shows an architecture diagram of the whole lcd, where image data (Video Stream) is decoded and then input to a timing control chip 1(T-CON), the timing control chip 1 performs certain data processing to generate data required by a Gate Driver IC (Gate Driver IC) or a Gate On Array, and generate data required by a Source Driver IC (Source Driver IC) 3, and the processed image data is transmitted to the Gate Driver IC 2 (or Gate On Array, GOA for short) and the Source Driver IC 3 according to a certain timing. The Gate driver chip 2 (or Gate On Array, GOA for short) can generate a switching signal according to the received image data, and transmit the switching signal to the Gate lines in the display panel 4. The source driving chip 3 is capable of generating a voltage signal (i.e., a data signal) according to the received image data and transmitting the voltage signal to the data lines in the display panel 4.

Illustratively, when the gate driving chip 2 is included in the liquid crystal display panel, the layout position of the gate driving chip 2 may be located at the positions indicated by the

marks

5 and 6. The gate driving chip 2 or the GOA can be selectively disposed in the liquid crystal display panel. The source driving chip 3 may be disposed on the upper or lower side of the display panel 4 as in fig. 1 according to actual needs.

Referring to fig. 2, fig. 2 shows a layout of Gate lines (e.g., Gate 1-Gate 6), data lines (Source 1-Source 10), and sub-pixels (e.g., mark 402) inside the display panel 4. The display panel 4 includes a plurality of sub-pixels distributed in an array, and for example, the number of sub-pixels of a typical Full High Definition (FHD) lcd is 1920 × 1080 × 3 or 1920 × 1080 × 4, and the number of sub-pixels of an Ultra High Definition (UHD) lcd is 3840 × 2160 × 3 or 3840 × 2160 ″.

Illustratively, the liquid crystal display includes a plurality of gate driver chips 2, each gate driver chip 2 corresponds to a portion of the gate lines electrically connected to generate a switching signal at a certain timing and transmit the switching signal to the corresponding gate line, so as to control the on/off of each row of sub-pixels correspondingly connected to the gate line.

The gate lines in the display panel 4 scan line by line, the data lines write data signals into sub-pixels of each line by line, and the liquid crystal of each sub-pixel is controlled to deflect to a certain degree, so that the backlight is controlled to pass through the liquid crystal with a certain luminous flux, and the backlight is emitted out of the display panel 4 after being filtered in color, so that the display panel 4 finally presents different color levels.

It should be noted that the layout of the sub-pixels in the display panel 4 and the connection relationship between the sub-pixels and the gate and data lines are various, and the display panel includes, for example, a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B; specific arrangement modes of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B, and connection relations between the sub-pixels and the gate and data lines include specific modes as shown in fig. 3, 4 and 5.

When the liquid crystal display realizes the display function, multiple frames of images can be sequentially displayed, and when the image data corresponding to each frame of image is different, the corresponding turning states of the liquid crystal are controlled to be different.

And sequentially acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display, and determining the overturning state of the liquid crystal when each frame of image is displayed based on the image data corresponding to each frame of image.

In more detail, according to the image data of the current frame image and the image data of the previous frame image to be displayed by the liquid crystal display, a first turning state of the liquid crystal when the liquid crystal display displays the previous frame image and a second turning state of the liquid crystal when the liquid crystal display displays the current frame image can be determined, and according to the first turning state and the second turning state, the turning degree of the liquid crystal when the liquid crystal display is switched from the first frame image to the second frame image can be determined. And compensating the image data corresponding to the current frame image according to the turnover degree to obtain first image compensation data corresponding to the current frame image.

As shown in fig. 6, the abscissa represents time, the ordinate represents driving Level (Drive Level), 1003 represents a variation curve of original image data corresponding to the previous subpixel displaying the current frame image, and 1001 represents an optical response curve of the corresponding liquid crystal before compensation when the liquid crystal display displays the current frame image. 1004 is a variation curve of the corresponding first image compensation data for positive compensation when the compensated sub-pixel displays the current frame image, 1005 is a variation curve of the corresponding first image compensation data for negative compensation when the compensated sub-pixel displays the current frame image, and 1002 is an optical response curve of the corresponding liquid crystal when the compensated liquid crystal display displays the current frame image.

As can be seen from fig. 6, when the driving compensation method provided by the embodiment of the present invention is used to perform driving compensation on the liquid crystal display, the voltage value of the data signal received by the sub-pixel after the forward compensation is higher than the voltage value of the data signal before the compensation in the time period from t1 to t2, so that the optical response of the liquid crystal is accelerated (see 1002), and the liquid crystal display can reach the target brightness in a shorter time. In the time from t3 to t4, the voltage value of the data signal received by the sub-pixel after negative compensation is lower than that before compensation, so that the optical response of the liquid crystal is accelerated and the next inversion state is reached more quickly.

Therefore, when the driving compensation method provided by the embodiment of the invention is used for driving the liquid crystal display to display, the corresponding turning degree of the liquid crystal can be determined when the liquid crystal display is switched from the previous frame image to the current frame image according to the image data of the previous frame image and the image data of the current frame image; and carrying out adaptive compensation on the image data corresponding to the current frame image according to the turnover degree; therefore, after the data signals generated based on the first image compensation data are written into the sub-pixels, the response speed of the liquid crystal can be effectively improved, the response time of the liquid crystal is shortened, and the phenomenon that the liquid crystal display is blurred when the liquid crystal display displays the picture is avoided.

In some embodiments, the step of acquiring image data corresponding to each frame of image to be displayed by the liquid crystal display specifically includes:

Specifically, as shown in fig. 7, the receiving module 101 sequentially receives image data corresponding to each frame image sent from the front end. When receiving image data corresponding to a first frame image, the receiving module 101 transmits the image data corresponding to the first frame image to the compressing module 102, and the compressing module 102 compresses the image data corresponding to the first frame image and then transmits the compressed image data to the storage module 104 for storage.

Starting from the second frame of image, when receiving the image data corresponding to each frame of image, the receiving module 101 transmits the image data corresponding to each frame of image to the compressing module 102, and the compressing module 102 compresses the image data corresponding to each frame of image and transmits the compressed image data to the storing module 104 for storage; meanwhile, the receiving module 101 transmits image data corresponding to each frame of image to the response time compensation module 105.

When the response time compensation module 105 receives image data corresponding to a current frame image from a second frame image, the decompression module 103 can decompress and acquire image data corresponding to a previous frame image from the storage module 104, and transmit the image data corresponding to the previous frame image to the response time compensation module 105. The response time compensation module 105 determines first image compensation data corresponding to the current frame image according to the image data of the current frame image and the image data of the previous frame image to be displayed by the liquid crystal display.

It should be noted that the receiving module 101, the compressing module 102, the decompressing module 103, the storing module 104 and the response time compensating module 105 may be part of the timing control chip 1.

In the driving compensation method provided in the above embodiment, the response time compensation module 105 acquires the image data of the previous frame of image through the compression and decompression processes, so as to effectively increase the speed of acquiring the image data of the previous frame of image, thereby effectively increasing the speed of driving compensation for the liquid crystal display.

In some embodiments, the image data corresponding to each frame image comprises initial gray scale data corresponding to each sub-pixel one by one;

the abscissa of the index value of the first compensation data table comprises initial gray scale data of a previous frame image corresponding to the sub-pixel, the ordinate of the index value of the first compensation data table comprises initial gray scale data of a current frame image corresponding to the sub-pixel, and the first compensation data table stores first gray scale compensation data of the current frame image corresponding to the index value one to one.

Specifically, as shown in fig. 8, 501 denotes image data of a previous frame image, i.e., image data decompressed by the

decompression module

103, and 502 denotes image data of a current frame image, i.e., image data directly transmitted from the receiving module 101 to the response time compensation module 105. For example, fig. 8 shows the same sub-pixel in the display panel, the corresponding initial gray-scale data 601 of the previous frame image, and the corresponding initial gray-scale data 602 of the current frame image, when compensating the initial gray-scale data 602 of the current frame image, the correction compensation is performed with reference to the initial gray-scale data 601 of the previous frame image.

Fig. 9 illustrates an N × M first compensation data table, in which the abscissa of the index value of the first compensation data table includes initial gray-scale data (e.g., G1-GN) of a previous frame image corresponding to a sub-pixel, and the ordinate of the index value of the first compensation data table includes initial gray-scale data (e.g., T1-TM) of a current frame image corresponding to a sub-pixel, and the first compensation data table stores therein first gray-scale compensation data L of the current frame image corresponding to one-to-one index value. It should be noted that the first gray scale compensation data L may be the final compensated data, i.e. the data signal is obtained directly based on the first gray scale compensation data L without performing other operations on the first gray scale compensation data L. Or, the first gray-scale compensation data L may be a difference value to be compensated, that is, the difference value and the initial gray-scale data of the current frame image need to be added to obtain final compensated data, and then a data signal is obtained based on the final compensated data.

In more detail, taking the position 701 in the first compensation data table as an example, G3 in L (G3, T4) at the position 701 represents the initial gray-scale data of the previous frame image corresponding to the sub-pixel, for example: g3 takes the value 50; t4 represents the initial gray-scale data of the current frame image corresponding to the sub-pixels, such as: t4 takes the value 80; l represents first gray-scale compensation data of the current frame image, such as: l takes a value of 90; in this case, L is the final compensated data.

In another approach, for example: g3 takes the value 50; t4 takes the value 80; l takes the value of 10; in this case, L is a difference value to be compensated, i.e. the difference value needs to be added to the initial gray-scale data of the current frame image, i.e. 10+80, to obtain the final compensated data 90.

It is noted that the size of the first compensation data table is generally related to the Bit Depth (Bit-Depth) of the image data. For example: the bit depth of the image data is 8-bit, and the first compensation data table needs 256 × 256.

In order to save cost, when the first compensation data table is actually applied, downsampling the first compensation data table by a certain step length for storage, and when the first compensation data table is used, upsampling by the same step length for approximately recovering the corresponding first gray scale compensation data.

In the driving compensation method provided in the above embodiment, according to the initial gray scale data of the current frame image corresponding to each sub-pixel and the initial gray scale data of the previous frame image corresponding to each sub-pixel, the first gray scale compensation data of the current frame image corresponding to all sub-pixels is obtained from the pre-generated first compensation data table, and the first image compensation data corresponding to the current frame image is generated according to the first gray scale compensation data corresponding to all sub-pixels; and generating data signals corresponding to the sub-pixels based on the first image compensation data, wherein the data signals are compensated data signals, and after the data signals are written into the sub-pixels, the response speed of the liquid crystal can be effectively improved, the response time of the liquid crystal is shortened, and the phenomenon of blurring when the liquid crystal display displays a picture is avoided.

It is noted that the normal operation of the lcd also depends On the cooperation of the source driver chip 3 and the Gate driver chip 2 (or Gate On Array). The driving circuit of each sub-pixel in the liquid crystal display comprises a group of resistors and capacitors, namely the driving circuit of the whole liquid crystal display is composed of a resistor matrix and a capacitor matrix. For the gate driving chip 2, as the positions of the resistor and the capacitor are farther and farther from the position of the gate driving chip 2, the scanning signal will generate a certain time delay, thereby causing the capacitor to be insufficiently charged within a certain time. Similarly, a column of sub-pixels connected to the same data line has a similar problem in that the sub-pixels far from the source driver chip 3 receive a delayed data signal, thereby causing insufficient charging. The two delay methods can cause the liquid crystal display to be insufficiently charged, and cause the same signal to present different performances at different positions of the same panel, thereby causing the display quality of the panel to be reduced. This problem is more pronounced as the panel size increases.

In some embodiments, the liquid crystal display includes gate lines and data lines arranged in a crossing manner, and a plurality of sub-pixels distributed in an array, where the plurality of sub-pixels include a plurality of columns of sub-pixels corresponding to the data lines one to one, and each sub-pixel in each column of sub-pixels is electrically connected to a corresponding data line;

according to the first gray scale compensation data corresponding to all the two adjacent sub-pixels, second gray scale compensation data of a first target sub-pixel far away from the starting end of the data line in each two adjacent sub-pixels corresponding to the current frame image are obtained from a pre-generated second compensation data table; the abscissa of the index value of the second compensation data table includes first gray-scale compensation data corresponding to a non-first target subpixel in the two adjacent subpixels, the ordinate of the index value of the second compensation data table includes first gray-scale compensation data corresponding to the first target subpixel in the two adjacent subpixels, second gray-scale compensation data corresponding to the index value one by one are stored in the second compensation data table, and the second gray-scale compensation data is second gray-scale compensation data corresponding to the current frame image of the first target subpixel.

Specifically, the liquid crystal display comprises a plurality of grid lines and a plurality of data lines, wherein the grid lines and the data lines are arranged in a crossed mode. The liquid crystal display further comprises a plurality of sub-pixels distributed in an array, wherein the plurality of sub-pixels comprise a plurality of rows of sub-pixels and a plurality of columns of sub-pixels, exemplarily, the plurality of rows of sub-pixels correspond to the plurality of grid lines one by one, and the plurality of columns of sub-pixels correspond to the plurality of data lines one by one; each sub-pixel included in each row of sub-pixels is electrically connected with the corresponding grid line, and each sub-pixel included in each column of sub-pixels is electrically connected with the corresponding data line.

As shown in fig. 10, the sub-pixel 403 and the sub-pixel 404 are two adjacent sub-pixels in the same column, and when the scan signal inputted from the Gate line Gate1 is at the active level, the sub-pixel 403 is charged by the data line Source1, and when the scan signal inputted from the Gate line Gate2 is at the active level, the sub-pixel 404 is charged by the data line Source 1.

Fig. 11 illustrates an N × M second compensation data table, in which the abscissa of the index value of the second compensation data table includes the first gray scale compensation data (e.g., G1-G6) corresponding to the non-first target sub-pixel in the two adjacent sub-pixels, and the ordinate of the index value of the second compensation data table includes the first gray scale compensation data (e.g., T1-TM) corresponding to the first target sub-pixel in the two adjacent sub-pixels, and the second compensation data table stores the second gray scale compensation data L of the current frame image corresponding to the index value. It should be noted that the second gray scale compensation data L may be finally compensated data, that is, the data signal is directly obtained based on the second gray scale compensation data L without performing other operations on the second gray scale compensation data L. Or, the second gray-scale compensation data L may be a difference value to be compensated, that is, the difference value and the initial gray-scale data of the current frame image need to be added to obtain final compensated data, and then a data signal is obtained based on the final compensated data.

In more detail, taking the position 801 in the second compensation data table as an example, G2 in L (G2, T4) at the position 801 represents the first gray scale compensation data corresponding to the sub-pixel 403 (i.e. not the first target sub-pixel), T4 represents the first gray scale compensation data corresponding to the sub-pixel 404 (i.e. the first target sub-pixel), and L represents the second gray scale compensation data corresponding to the first target sub-pixel when displaying the current frame image. The second gray scale compensation data is formed with reference to the first gray scale compensation data of the sub-pixel 403, and is used when the sub-pixel 404 is charged.

Illustratively, G2 takes the value 60; t4 takes the value 90; l takes the value of 100; in this case, L is the final compensated data.

In another approach, for example: g2 takes the value 60; t4 takes the value 90; l takes the value of 10; in this case, L is a difference value to be compensated, i.e. the difference value needs to be added to the first gray-scale compensation data of the current frame image, i.e. 10+90, to obtain the final compensated data 100.

It is noted that the size of the second compensation data table is generally related to the Bit Depth (Bit-Depth) of the image data. For example: the bit depth of the image data is n-bit, and the second compensation data table needs 2ⁿ*2ⁿSize.

Similarly, in order to save cost, when the second compensation data table is actually applied, the second compensation data table may be downsampled and stored in a certain step length, and when the second compensation data table is to be used, the corresponding second gray-scale compensation data is approximately restored by upsampling in the same step length.

The response time compensation module 105 can obtain first gray scale compensation data corresponding to each sub-pixel, the first gray scale compensation data corresponding to each sub-pixel forms first image compensation data corresponding to the current frame image, and the first image compensation data is transmitted to the under-charge compensation module 106.

The under-charge compensation module 106 obtains, from a pre-generated second compensation data table, second gray scale compensation data of a current frame image corresponding to a first target subpixel far from the start end of the data line in each two adjacent subpixels according to the first gray scale compensation data corresponding to each of the two adjacent subpixels; that is, the under-charge compensation module 106 can obtain second gray scale compensation data of the current frame image corresponding to all the first target sub-pixels in the display panel. The driving module 107 generates a data signal for writing into each first target sub-pixel based on the second gray scale compensation data corresponding to each first target sub-pixel.

In the driving compensation method provided in the above embodiment, the second gray scale compensation data of the first target sub-pixel in each row of sub-pixels is obtained by compensation based on the first gray scale compensation data of the non-first target sub-pixel adjacent to the first target sub-pixel, so that the display quality of the liquid crystal display at different positions can be consistent, and the difference of the same picture when displayed at different positions can be reduced.

Fig. 12 illustrates a gate driver module and a row of sub-pixels controlled by the gate driver module, which may be located at the left side 202 as illustrated, and which may be a conventional gate driver chip or GOA design. In practice, the sub-pixels 405 and 406 may be charged differently, and the sub-pixels 406 far from the 202 position may be under-charged.

Fig. 13 illustrates two gate driver modules and a row of sub-pixels controlled by the gate driver modules, which may be located at the left side 202 and the right side 203, respectively, as illustrated, and which may be conventional gate driver ICs or gate on array designs. Due to the position of the gate driving module, the charging of the sub-pixel 405, the sub-pixel 406 and the sub-pixel 407 may be different, and 407 may be under-charged due to being far away from the gate driving module.

As shown in fig. 14, the abscissa in fig. 14 represents the position, and the ordinate represents the charging rate. The same charging time and charging voltage are given at different positions p1, p2, p3, p4 of the display panel. For a row of sub-pixels corresponding to fig. 12, the charging rate variation curve is shown as curve 1101. For a row of sub-pixels corresponding to fig. 13, the charging rate curve is shown as curve 1102, although r2 may not be the same at the p1 and p4 positions. It is noted that the curve 1101 may also correspond to the charging performance of each sub-pixel electrically connected to one data line, similar to the case of the gate driving module.

In some embodiments, the plurality of sub-pixels include a plurality of rows of sub-pixels in one-to-one correspondence with the gate lines, and each sub-pixel in each row of the sub-pixels is electrically connected to a corresponding gate line;

Specifically, the abscissa of the index value of the third compensation data table includes the abscissa of the second target sub-pixel (e.g., sub-pixel 406), the ordinate of the index value of the third compensation data table includes the ordinate of the second target sub-pixel, and the third compensation data table stores compensation parameters corresponding to the index values one to one.

When the second gray scale compensation data corresponding to the second target sub-pixel is obtained from the second compensation data table, the specific obtaining manner is as follows: and searching and acquiring second gray scale compensation data corresponding to the second target sub-pixel from a second compensation data table according to the first gray scale compensation data of the second target sub-pixel and the first gray scale compensation data of the sub-pixel which is positioned in the same row and adjacent to the second target sub-pixel and is closer to the starting end of the data line.

Similarly, the first gray scale compensation data of the second target sub-pixel can be obtained from the first compensation data table.

The step of generating a data signal for writing into the second target sub-pixel based on the first gray scale compensation data, the second gray scale compensation data and the compensation parameter corresponding to the second target sub-pixel specifically includes:

illustratively, the second gray scale compensation data corresponding to the second target sub-pixel is a difference 10 to be compensated, the first gray scale compensation data corresponding to the second target sub-pixel is 90, the compensation parameter corresponding to the second target sub-pixel is 1.1, and then after the second target sub-pixel undergoes compensation along the gate line direction, the obtained third gray scale compensation data is 90+10 × 1.1, that is, the third gray scale compensation data is 101.1.

The step of generating a data signal for writing into the second target sub-pixel based on the first gray scale compensation data, the second gray scale compensation data and the compensation parameter corresponding to the second target sub-pixel comprises: generating a data signal for writing into the second target subpixel based on the third grayscale compensation data.

In the driving compensation method provided in the foregoing embodiment, according to the position data corresponding to the second target subpixel, a compensation parameter corresponding to the second target subpixel is obtained from a third compensation data table generated in advance; acquiring second gray scale compensation data corresponding to the second target sub-pixel from the second compensation data table; and obtaining the third gray scale compensation data according to the first gray scale compensation data, the compensation parameter and the second gray scale compensation data, and further obtaining a data signal written into the second target sub-pixel according to the third gray scale compensation data.

In the driving compensation method provided by the above embodiment, the third gray scale compensation data of the second target sub-pixel is obtained by compensating the position (i.e. the distance between the third gray scale compensation data and the initial end of the corresponding gate line) of the second target sub-pixel in the display panel based on the second gray scale compensation data of the adjacent sub-pixel in the same column, so that the display quality of the liquid crystal display at different positions can tend to be consistent, and the difference of the same picture when the same picture is displayed at different positions can be reduced.

It should be noted that, when performing charge compensation in the gate line direction, the second compensation data table and the third compensation data table may be integrated into one compensation data table. Similarly, the third compensation data table may also be downsampled for cost saving, and then upsampled in real time during actual chip operation to recover intermediate data.

It is noted that when compensating the sub-pixel located in the middle in the structure shown in fig. 13, the reference sub-pixel corresponding to the middle sub-pixel may be determined according to which gate line the middle sub-pixel is specifically located.

It should be noted that, when the driving compensation method provided by the above embodiment is used for driving compensation, it is equivalent to undergo three-stage compensation, and the first-stage compensation is to compensate all sub-pixels based on the change of two adjacent frames of image data; the second-stage compensation is to compensate the first target sub-pixel based on the difference of the gray scale data of two adjacent sub-pixels along the extension direction of the data line; the third-stage compensation is based on a second target sub-pixel which is arranged along the extending direction of the grid line and has a certain distance with the starting end of the grid line; the first-stage compensation is time-domain compensation, and the second-stage and third-stage compensation are space-domain compensation, so that the driving compensation method provided by the embodiment utilizes a voltage overdrive technology in time domain and space domain, and combines a combined compensation technology in space domain, thereby well improving the display quality of the liquid crystal display; meanwhile, the display quality of different positions of the liquid crystal display tends to be consistent, and the difference of the same picture in different positions is well reduced.

In addition, it is noted that all the sub-pixels in the display panel undergo the first-level compensation, part of the sub-pixels (i.e., the first target sub-pixels) undergo the second-level compensation, and part of the sub-pixels (i.e., the second target sub-pixels) undergo the third-level compensation.

The downsampling storage and the upsampling restoration performed on the first compensation data table, the second compensation data table, and the third compensation data table are described below.

As shown in fig. 15, fig. 15 shows the third compensation data table after down-sampling, where the parameter i represents the abscissa of the index value and the parameter j represents the ordinate of the index value.

As shown in fig. 16, when performing bilinear difference, the algorithm is as follows:

E＝(A*alpha+B*(x-alpha))/x

F＝(C*alpha+D*(x-alpha))/x

G＝(E*beta+F*(y-beta))/y

alpha＝distance(E，B)，x＝distance(A，B)

beta＝distance(G，F)，y＝distance(E，F)

illustratively, a represents an initial compensation parameter determined according to the position data of the second target sub-pixel, and B, C, D are respectively compensation parameters near a, and a compensation parameter G finally required by the second target sub-pixel is calculated according to the above algorithm.

It should be noted that, when the initial compensation parameter a is determined according to the position data of the second target subpixel, if there is no index value corresponding to the position data of the second target subpixel in the up-sampled third compensation data table, an index value with the closest position may be found in the third compensation data table according to the position data of the second target subpixel, and the index value is used as the index value corresponding to the second target subpixel.

As shown in fig. 17, when performing the triangulation, the algorithm is as follows:

G＝A*alpha1+B*beta1+D*theta1

H＝A*alpha2+C*beta2+D*theta2

alpha1＝area(BGD)，beta1＝area(AGD)

theta1＝area(AGB)

alpha2＝area(CHD)，beta2＝area(AHD)

theta2＝area(AHC)

the delta values in fig. 17 include an upper delta value mode and a lower delta value mode, and in practical application, the upper delta value mode or the lower delta value mode may be determined to be adopted according to the actual position of the sub-pixel to be compensated.

It should be noted that distance represents a distance function, and area represents an area function.

When the upsampling recovery is performed, different sub-pixels in the display panel select different upsampling difference modes, for example, as shown in fig. 15, a sub-pixel located near a diagonal line extending from the upper left corner to the lower right corner in fig. 15 adopts a triangular difference value to obtain a corresponding compensation parameter; and adopting bilinear difference values to obtain corresponding compensation parameters for the sub-pixels far away from the diagonal line.

The embodiment of the present invention further provides a driving compensation device for a liquid crystal display, which is used for implementing the driving compensation method provided by the above embodiment, and the driving compensation device includes: the device comprises an acquisition module, a response time compensation module and a driving module;

When the driving compensation device provided by the embodiment of the invention is adopted to drive the liquid crystal display to display, the corresponding turning degree of the liquid crystal can be determined when the liquid crystal display is switched from the previous frame image to the current frame image according to the image data of the previous frame image and the image data of the current frame image; and carrying out adaptive compensation on the image data corresponding to the current frame image according to the turnover degree; therefore, after the data signals generated based on the first image compensation data are written into the sub-pixels, the response speed of the liquid crystal can be effectively improved, the response time of the liquid crystal is shortened, and the phenomenon that the liquid crystal display is blurred when the liquid crystal display displays the picture is avoided.

In some embodiments, the obtaining module specifically includes: the device comprises a receiving module, a compression module, a storage module and a decompression module;

the response time compensation module is specifically configured to:

In some embodiments, the liquid crystal display includes gate lines and data lines arranged in a crossing manner, and a plurality of sub-pixels distributed in an array, where the plurality of sub-pixels include a plurality of columns of sub-pixels corresponding to the data lines one to one, and each sub-pixel in each column of sub-pixels is electrically connected to a corresponding data line; the drive compensation device further includes: an undercharge compensation module;

The embodiment of the invention also provides a liquid crystal display which comprises the driving compensation device provided by the embodiment.

In the driving compensation device provided by the embodiment, the response time compensation module and the undercharge compensation module are added, so that the sharpness of a moving picture is effectively improved under the condition of not changing a liquid crystal display framework, and the display consistency of different display areas is improved.

Therefore, the liquid crystal display device provided by the embodiment of the invention can realize higher display quality when comprising the driving compensation device provided by the embodiment.

It should be noted that the liquid crystal display may be: any product or component with a display function, such as a television, a display, a digital photo frame, a mobile phone, a tablet computer and the like.

It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments, since they are substantially similar to the method embodiments, they are described simply, and reference may be made to some descriptions of the product embodiments for relevant points.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected," "coupled," or "connected," and the like, are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A driving compensation method for a liquid crystal display, wherein the liquid crystal display comprises grid lines and data lines which are arranged in a crossed manner, and a plurality of sub-pixels which are distributed in an array, the plurality of sub-pixels comprise a plurality of rows of sub-pixels which are in one-to-one correspondence with the data lines, and each sub-pixel in each row of sub-pixels is respectively electrically connected with the corresponding data line, the driving compensation method comprises the following steps:

generating data signals for writing into the respective sub-pixels included in the liquid crystal display based on the first image compensation data, the steps including:

acquiring first gray scale compensation data corresponding to each of all adjacent two sub-pixels in the same row of sub-pixels;

2. The driving compensation method of the liquid crystal display according to claim 1, wherein the step of obtaining the image data corresponding to each frame of image to be displayed by the liquid crystal display specifically comprises:

3. The driving compensation method of claim 1, wherein the image data corresponding to each frame of image comprises initial gray scale data corresponding to each sub-pixel;

4. The driving compensation method of claim 1, wherein the plurality of sub-pixels comprise a plurality of rows of sub-pixels corresponding to the gate lines one to one, and each sub-pixel in each row of the sub-pixels is electrically connected to the corresponding gate line;

and generating a data signal for writing into the second target sub-pixel based on the first gray scale compensation data, the second gray scale compensation data and the compensation parameter corresponding to the second target sub-pixel.

5. A driving compensation device of a liquid crystal display, for implementing the driving compensation method according to any one of claims 1 to 4, wherein the liquid crystal display comprises gate lines and data lines arranged in a crossing manner, and a plurality of sub-pixels distributed in an array, the plurality of sub-pixels comprise a plurality of rows of sub-pixels corresponding to the data lines one by one, and each sub-pixel in each row of sub-pixels is electrically connected with the corresponding data line; the drive compensation device includes: the system comprises an acquisition module, a response time compensation module, an undercharge compensation module and a driving module;

the drive module is used for: generating a data signal for writing into each sub-pixel included in the liquid crystal display based on the first image compensation data; the under-charge compensation module is used for: acquiring first gray scale compensation data corresponding to each of all adjacent two sub-pixels in the same row of sub-pixels;

6. The driving compensation apparatus of claim 5, wherein the obtaining module comprises: the device comprises a receiving module, a compression module, a storage module and a decompression module;

7. The driving compensation apparatus of claim 5, wherein the image data corresponding to each frame of image comprises initial gray-scale data corresponding to each sub-pixel;

the response time compensation module is specifically configured to:

8. The driving compensation device of claim 5, wherein the plurality of sub-pixels comprise a plurality of rows of sub-pixels corresponding to the gate lines one to one, and each sub-pixel in each row of the sub-pixels is electrically connected to the corresponding gate line;

9. A liquid crystal display comprising the drive compensation device according to any one of claims 5 to 8.