WO2020211149A1

WO2020211149A1 - Pixel charging method and display device

Info

Publication number: WO2020211149A1
Application number: PCT/CN2019/088052
Authority: WO
Inventors: 杨惠
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2019-04-17
Filing date: 2019-05-23
Publication date: 2020-10-22
Also published as: CN110085182A

Abstract

Provided are a pixel charging method and a display device. Grayscale compensation is performed on pixels by means of establishing a grayscale data compensation table, thereby causing the pixels to reach corresponding display pixel voltages without changing the charging time of the pixels. Pixel charging speed and the uniformity of display brightness are thus improved, effectively solving the problem of display panels having uneven display brightness caused by delay from signal transmission wires.

Description

Pixel charging method and display device

Technical field

The present invention relates to the field of display technology, in particular to a pixel charging method and a display device.

Background technique

Liquid Crystal Display (LCD) is a commonly used electronic device. Because of its low power consumption, small size, and light weight, it is highly favored by users. The current liquid crystal displays are mainly thin film transistors (Thin Film Transistor, TFT) mainly liquid crystal displays.

Liquid crystal display panel technology is a display technology that rotates a specific angle based on a voltage applied to liquid crystal molecules. By changing the driving voltage applied to the two ends of the liquid crystal molecules, the liquid crystal molecules are rotated accordingly, so that the traveling direction of the light from the light source generated by the backlight unit is changed. The different rotation angles of the liquid crystal molecules can be used to set The red, green, and blue filters present different grayscale brightness. By combining three sub-pixel display points of red, blue, and green with different grayscale brightness, a single pixel display point with different color changes can be formed.

The characteristic of liquid crystal molecules is that if the polarity of the driving voltage applied to the liquid crystal molecules remains unchanged, the liquid crystal molecules will be destroyed and cannot be recovered. Therefore, while keeping the voltage value of the driving voltage at both ends of the liquid crystal molecules unchanged, it is necessary to invert the voltage polarity of the driving voltage at regular intervals. That is, the polarity of the positive voltage polarity and the negative voltage polarity of the driving voltage with respect to the common electrode are reversed. Here, the polarity of the driving voltage is relative to the common electrode of the liquid crystal panel. When the voltage of the pixel electrode is higher than the voltage of the common electrode, it is called positive polarity. When the voltage of the pixel electrode is lower than the voltage of the common electrode , Called negative polarity. Regardless of whether the voltage of the pixel electrode is positive or negative, as long as the absolute value of the voltage is the same, it will have the same grayscale brightness. Therefore, when the absolute value of the difference between the voltage of the pixel electrode and the common voltage is fixed, regardless of whether the voltage polarity of the pixel electrode is positive or negative, the grayscale brightness of the pixel is the same, but the liquid crystal molecules are turned The directions are opposite, thus avoiding the characteristic damage caused by the liquid crystal molecules being fixed in the same direction all the time. The existing polarity inversion methods include frame polarity inversion (Frame inversion), row/column polarity inversion (Row/Column inversion) and dot polarity inversion (Dot inversion) and other methods.

For liquid crystal display panels, the larger the size, the higher the resolution, but because the data lines and signal lines are made of metal, the voltage transmitted to the pixels at the far end of the LCD panel is less than that of the near-end pixels, that is, the far-end pixels are The more the pixel voltage is not fully charged, it will cause the LCD panel to display uneven brightness, flickering and other problems. The prior art can solve the problem of uneven brightness caused by grayscale changes under the same polarity, but the polarity is switched The problem of uneven brightness at the time cannot be effectively improved.

In summary, the existing display panel has the problem of uneven display brightness due to signal transmission line delay. Therefore, it is necessary to provide a pixel charging method and a display device to improve this defect.

technical problem

For liquid crystal display panels, the larger the size, the higher the resolution, but because the data lines and signal lines are made of metal, the voltage transmitted to the pixels at the far end of the LCD panel is less than that of the near-end pixels, that is, the far-end pixels The more the pixel voltage is not fully charged, it will cause the LCD panel to display uneven brightness, flickering and other problems. The prior art can solve the problem of uneven brightness caused by grayscale changes under the same polarity, but the polarity is switched The problem of uneven brightness at the time cannot be effectively improved.

Technical solutions

The present disclosure provides a pixel charging method and a display device, which are used to solve the problem of uneven display brightness caused by signal transmission line delay in existing display panels.

The embodiments of the present disclosure provide a pixel charging method, including:

Step S10: providing a display panel, the display panel including a plurality of pixels arranged in an array;

Step S20: preset the compensation data table of the pixel;

Step S30: Provide image data for the pixel;

Step S40: Calculate the gray scale compensation value of the pixel through the compensation data table according to the polarity inversion mode of the pixel and the image data; and

Step S50: Perform gray-scale compensation on the pixel according to the gray-scale compensation value of the pixel.

According to an embodiment of the present disclosure, the compensation data table includes a grayscale compensation data table and a polarity compensation data table.

According to an embodiment of the present disclosure, the image data is provided for the pixels of the display panel in a row unit.

According to an embodiment of the present disclosure, in the step S40, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the pixel has a grayscale change, and the grayscale compensation data table is used Calculate the gray scale compensation value, where n≥2.

According to an embodiment of the present disclosure, in the step S40, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity and gray level of the pixels are changed, and the The polarity compensation data table calculates the gray scale compensation value, where n≥2.

According to an embodiment of the present disclosure, the method further includes: determining the position of the sub-pixel in the pixel that needs to be compensated according to the arrangement manner of the pixels and the polarity inversion manner, and referencing when performing compensation The position of the reference sub-pixel is established to establish a position lookup table.

According to an embodiment of the present disclosure, the input of the image data is delayed before the gray scale compensation is performed on the pixel.

The embodiment of the present disclosure also provides a pixel charging method, including:

Step S20: preset the compensation data table of the pixel;

Step S30: Provide image data for the pixel in a row unit, and delay input of the image data;

According to an embodiment of the present disclosure, in the step S40, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity and grayscale of the pixels are changed, and the The polarity compensation data table calculates the gray scale compensation value, where n≥2.

The present disclosure also provides a display device, including:

A display panel including pixels arranged in an array; and

A gray-scale compensator connected to the display panel, the gray-scale compensator is configured to detect the change in the gray scale and polarity of the pixel, and calculate the gray-scale compensation value of the pixel through a compensation data table, Compensate the pixel according to the grayscale compensation value;

Wherein, the compensation data table includes a gray scale compensation data table and a polarity compensation data table.

According to an embodiment of the present disclosure, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row, the pixel has a grayscale change, and the grayscale compensator passes through the grayscale compensation data table Calculate the gray scale compensation value, where n≥2.

According to an embodiment of the present disclosure, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity and gray scale of the pixels are changed, and the gray scale compensator passes through the The polarity compensation data table calculates the gray scale compensation value, where n≥2.

Beneficial effect

The beneficial effects of the present disclosure: the present disclosure establishes a compensation data table, including a grayscale compensation data table and a polarity compensation data table, according to the polarity inversion mode of the display panel pixels and the image data, when only the grayscale of the pixel changes When the gray-scale compensation data table is used to calculate the gray-scale compensation value; when the polarity and gray-scale of the pixel both change, the gray-scale compensation value is calculated through the polarity compensation data table, and then the pixel Perform grayscale compensation, so that the pixels reach the corresponding display pixel voltage without changing the pixel charging time, improve the charging rate of the display panel pixels and the uniformity of the display brightness, and effectively solve the problem of the display panel caused by the signal transmission line delay The problem of uneven display brightness.

Description of the drawings

In order to explain the embodiments or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for disclosure For some embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic flowchart of a pixel charging method provided in the first embodiment of the disclosure;

2 is a schematic flowchart of the pixel charging method provided in the second embodiment of the disclosure;

3 is a schematic block diagram of the display device provided in the third embodiment of the disclosure.

Embodiments of the invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments that can be implemented in this application. The directional terms mentioned in this application, such as [Up], [Down], [Front], [Back], [Left], [Right], [Inner], [Outer], [Side], etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to illustrate and understand the application, rather than to limit the application. In the figure, units with similar structures are indicated by the same reference numerals.

The disclosure will be further described below in conjunction with the drawings and specific embodiments:

Example one:

The present disclosure provides a pixel charging method, as shown in FIG. 1, which is a schematic flowchart of the pixel charging method, including:

Step S20: preset the compensation data table of the pixel;

Step S30: Provide image data for the pixel;

Due to the capacitance and resistance delay of the display panel, along the data transmission direction, the voltage of the pixel at the end far from the data line is less than the voltage of the pixel at the end close to the data line. Therefore, the compensation data table of the pixel is preset according to the arrangement of the pixels and the polarity reversal. In another way, the gray scale compensation value of the pixel is calculated through the compensation data table, and the gray scale compensation is given to the pixel.

In this embodiment, the compensation data table includes a grayscale compensation data table and a polarity compensation data table. The existing polarity inversion methods include frame inversion, row inversion, column inversion, and dot inversion. Along the signal transmission direction of the data line, when the polarity inversion mode of the pixels is column inversion, the pixels on the same data line are all of the same polarity within one frame time, and the pixels only change in gray scale When the pixel is inverted in other ways except for the column inversion accident, the polarity and grayscale of the pixel are changed within one frame time.

Preferably, the image data is provided for the pixels of the display panel in a row unit.

Further, in the step S30, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row (n≥2), the image data only changes in gray scale, and it is considered that the image data In the line signal transmission direction, the polarity inversion mode of the pixel is column inversion, and the gray-scale compensation value is calculated through the gray-scale compensation data table.

Further, in the step S30, along the data line signal transmission direction, when scanning from the n-1th row to the nth row (n≥2), the polarity of the image data changes. In the signal transmission direction, the polarity inversion mode of the pixel is non-column inversion, and the gray scale of the pixel also changes, and the gray scale compensation value is calculated through the polarity compensation data table.

Preferably, the pixel charging method further includes: determining the position of the sub-pixel in the pixel that needs to be compensated and a reference to be referred to when performing the compensation according to the arrangement mode and the polarity inversion mode of the pixels The location of the sub-pixels, a location lookup table is established.

Preferably, before the grayscale compensation is performed on the pixel, delaying the input of the image data can be implemented by a data packer of the line data buffer, so as to ensure that the grayscale value of the pixel is guaranteed.

Embodiment two:

The present disclosure provides a pixel charging method, as shown in FIG. 2, which is a schematic flowchart of the pixel charging method, including:

Step S20: preset the compensation data table of the pixel;

In this embodiment, before the grayscale compensation is performed on the pixel, delaying the input of the image data can be implemented by the data packer of the line data buffer, thereby ensuring that the grayscale value of the pixel is guaranteed.

Example three:

FIG. 3 is a block diagram of a display device provided by an embodiment of the disclosure.

3, an embodiment of the present disclosure provides a display device 100, including:

A display panel 110, which includes pixels arranged in an array; and

The gray level compensator 120 is used to detect the gray level and polarity change of the pixel, and calculate the gray level compensation value of the pixel through the compensation data table, and calculate the gray level compensation value according to the gray level compensation Value to compensate the pixel;

In this embodiment, the existing polarity inversion methods include frame inversion, row inversion, column inversion, and dot inversion. Along the signal transmission direction of the data line, when the polarity inversion mode of the pixels is column inversion, the pixels on the same data line are all of the same polarity within one frame time, and the pixels only change in gray scale When the pixel is inverted in other ways except for the column inversion accident, the polarity and grayscale of the pixel are changed within one frame time.

In this embodiment, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row, the image data only changes in gray level, and the gray level compensator compensates the data by the gray level The table calculates the gray scale compensation value, where n≥2.

In this embodiment, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity of the image data changes, and the gray-scale compensator passes through the polarity compensation data table. Calculate the gray scale compensation value, where n≥2.

The embodiment of the present disclosure establishes a compensation data table, including a grayscale compensation data table and a polarity compensation data table. According to the polarity inversion mode of the display panel pixels and the image data, when only the grayscale of the pixel changes, the grayscale The gray-scale compensation value is calculated by the gray-scale compensation data table; when the polarity and gray-scale of the pixel are changed, the gray-scale compensation value is calculated through the polarity compensation data table, and then gray-scale compensation is performed on the pixel Therefore, without changing the pixel charging time, the pixels can reach the corresponding display pixel voltage, which improves the charging rate of the display panel pixels and the uniformity of the display brightness, and effectively solves the display panel's uneven display brightness caused by the signal transmission line delay. The problem.

In summary, although the present disclosure is disclosed as above in preferred embodiments, the above preferred embodiments are not intended to limit the present disclosure. Those of ordinary skill in the art can make various modifications without departing from the spirit and scope of the present disclosure. Modifications and modifications, therefore, the protection scope of this disclosure is based on the scope defined by the claims.

Claims

A pixel charging method includes:

Step S10: providing a display panel, the display panel including a plurality of pixels arranged in an array;

Step S20: preset the compensation data table of the pixel;

Step S30: Provide image data for the pixel;

Step S40: Calculate the gray scale compensation value of the pixel through the compensation data table according to the polarity inversion mode of the pixel and the image data; and

Step S50: Perform gray-scale compensation on the pixel according to the gray-scale compensation value of the pixel.
8. The pixel charging method of claim 1, wherein the compensation data table comprises a gray scale compensation data table and a polarity compensation data table.
3. The pixel charging method of claim 2, wherein the image data is provided for the pixels of the display panel in a row unit.
The pixel charging method according to claim 3, wherein, in the step S40, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row, the pixel undergoes a grayscale change and passes The gray-scale compensation data table is used to calculate the gray-scale compensation value, where n≥2.
The pixel charging method according to claim 3, wherein, in the step S40, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity and gray scale of the pixel are both When a change occurs, the gray-scale compensation value is calculated through the polarity compensation data table, where n≥2.
The pixel charging method according to claim 1, wherein the method further comprises: determining the sub-pixels of the pixels that need to be compensated according to the arrangement mode of the pixels and the polarity inversion mode The position and the position of the reference sub-pixel referenced when performing compensation, a position look-up table is established.
8. The pixel charging method of claim 1, wherein the input of the image data is delayed before the gray scale compensation is performed on the pixel.
A pixel charging method includes:

Step S10: providing a display panel, the display panel including a plurality of pixels arranged in an array;

Step S20: preset the compensation data table of the pixel;

Step S30: Provide image data for the pixel in a row unit, and delay input of the image data;

Step S40: Calculate the gray scale compensation value of the pixel through the compensation data table according to the polarity inversion mode of the pixel and the image data; and

Step S50: Perform gray-scale compensation on the pixel according to the gray-scale compensation value of the pixel.
8. The pixel charging method of claim 8, wherein the compensation data table includes a gray scale compensation data table and a polarity compensation data table.
The pixel charging method according to claim 9, wherein, in the step S40, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row, the pixel undergoes a grayscale change, passing all The gray-scale compensation data table is used to calculate the gray-scale compensation value, where n≥2.
9. The pixel charging method according to claim 9, wherein, in the step S40, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the polarity and gray scale of the pixel are both When a change occurs, the gray-scale compensation value is calculated through the polarity compensation data table, where n≥2.
8. The pixel charging method according to claim 8, wherein the method further comprises: determining the sub-pixels that need to be compensated in the pixel according to the arrangement mode of the pixels and the polarity inversion mode The position and the position of the reference sub-pixel referenced when performing compensation, a position look-up table is established.
A display device includes:

A display panel including pixels arranged in an array; and

A gray-scale compensator connected to the display panel, the gray-scale compensator is configured to detect the change in the gray scale and polarity of the pixel, and calculate the gray-scale compensation value of the pixel through a compensation data table, Compensate the pixel according to the grayscale compensation value;

Wherein, the compensation data table includes a gray scale compensation data table and a polarity compensation data table.
The display device according to claim 13, wherein, along the data line signal transmission direction, when scanning from the n-1th row to the nth row, the pixel has a gray level change, and the gray level compensator passes through the The gray-scale compensation data table calculates the gray-scale compensation value, where n≥2.
The display device according to claim 13, wherein, along the signal transmission direction of the data line, when scanning from the n-1th row to the nth row, the polarity and the gray scale of the pixel change, and the gray scale The compensator calculates the gray-scale compensation value through the polarity compensation data table, where n≥2.