Flexible display panel and display method thereof

• US 10,460,680 B2
• Filed: 06/28/2017
• Issued: 10/29/2019
• Est. Priority Date: 05/12/2017
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Zha, Guowei
• Primary Examiner(s): Lee, Jr., Kenneth B
• Application Number:
  US15/545,692
• Publication Number:
  US 20190213963A1
• Time in Patent Office: 853 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

The present invention discloses a liquid crystal display panel and a driving method thereof, and a liquid crystal display, which the driving method comprises: normalizing an image to be displayed first, to obtain characteristic data of the input image; extending backlight boundary of each backlight partition according to a default condition, and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension; the backlight opening coefficient of each backlight partition subjected to a fusion process, to obtain a driving current of the liquid crystal display panel; obtaining characteristic data of output image of each backlight partition based on the characteristic data of the input image and the driving current; displaying the output image by the driving current and the characteristic data. It is possible to display high-quality picture information in the case of optical crosstalk existing in the liquid crystal display panel.

Claims

1. A driving method of a liquid crystal display panel, wherein the driving method comprises the steps of:

normalizing an image to be displayed, which the image corresponding to each backlight partition of the liquid crystal display panel, to obtain characteristic data of the input image;

extending backlight boundary of each backlight partition according to a default condition, and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension;

the backlight opening coefficient of each backlight partition subjected to a fusion process, to obtain a driving current of the liquid crystal display panel;

obtaining characteristic data of output image of each backlight partition of the liquid crystal display panel based on the characteristic data of the input image and the driving current;

displaying an output image in accordance with the characteristic data of the output image by the driving current to drive the liquid crystal display panel.

2. The driving method as recited in claim 1, wherein the normalizing an image to be displayed which the image corresponding to each backlight partition of the liquid crystal display panel to obtain characteristic data of the input image comprises:

according to formula (1), normalizing an image to be displayed, which the image corresponding to each backlight partition of the liquid crystal display panel, to obtain the characteristic data indata(height, width, n);

3. The driving method as recited in claim 2, wherein the number of the grayscale colors is one of three or four.

4. The driving method as recited in claim 1, wherein the extending backlight boundary of each backlight partition according to a default condition and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension comprises:

obtaining a grayscale matrix formed by maximum grayscale values of image to be displayed, which the image being corresponding to each backlight partition of the liquid crystal display panel;

determining the number of adjacent partitions with extended backlight boundary, which the adjacent partition being in each backlight partition, then extending backlight boundary of each backlight partition by using the number;

determining a backlight opening coefficient after the boundary expansion of each backlight partition by the grayscale matrix and the minimum extension coefficient of each backlight partition of the liquid crystal display panel;

wherein the minimum extension coefficient is determined by a pixel partition corresponding to the partition.

5. The method as recited in claim 4, wherein the obtaining a grayscale matrix formed by maximum grayscale value of image to be displayed which the image being corresponding to each backlight partition of the liquid crystal display panel comprises:

obtaining sequentially the grayscale values of the image to be displayed of each backlight partition, to obtain a number corresponding to each grayscale values of backlight partition;

comparing the number corresponding to each grayscale values with a default number threshold, to obtain a grayscale value larger than the number threshold, and determining the maximum grayscale value that the number larger than the number threshold, which treated as the maximum grayscale value corresponding to backlight partition.

6. The method as recited in claim 4, wherein when the maximum grayscale value in any partition is detected as 0, determining the default grayscale value as the maximum grayscale value of the partition.

7. The method as recited in claim 4, wherein the minimum extension coefficients of the adjacent symmetric partitions corresponding to each backlight partition are the same.

8. The method as recited in claim 5, wherein when the maximum grayscale value in any partition is detected as 0, determining the default grayscale value as the maximum grayscale value of the partition.

9. The method as recited in claim 1, wherein the obtaining characteristic data of output image of each backlight partition of the liquid crystal display panel based on the characteristic data of the input image and the driving current comprises:

obtaining an output image outdata (height, width, n) of each backlight partition by formula (2);

outdata(height,width,n)=min(1,Lum_new(height,width))×

indata(height,width,n) 

 

(2)

wherein the Lum_new(height, width)is the image resolution corresponding to the drive current, the height is the resolution of height of the image, the width is the resolution of width of the image, n is the number of grayscale colors.

10. A liquid crystal display panel, wherein the liquid crystal display panel comprises a data input circuit, a data processing circuit, a driving circuit, and a display circuit, and wherein the input circuit, the driving circuit and the display circuit are connected to the data processing circuit respectively and electrically, and the display circuit is further connected to the driving circuit;

the data input circuit used for normalizing an image to be displayed, which the image corresponding to each backlight partition of the liquid crystal display panel, to obtain characteristic data of the input image;

the data processing circuit used for extending backlight boundary of each backlight partition according to a default condition, and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension;

the backlight opening coefficient of each backlight partition subjected to a fusion process, to obtain a driving current of the liquid crystal display panel;

obtaining characteristic data of output image of each backlight partition of the liquid crystal display panel based on the characteristic data of the input image and the driving current;

the display circuit used for displaying an output image in accordance with the characteristic data of the output image by the driving current to drive the display current.

11. The liquid crystal display panel as recited in claim 10, wherein the data processing circuit specifically normalizes an image to be displayed, which the image corresponding to each backlight partition of the liquid crystal display panel according to formula (1), to obtain the characteristic data indata(height, width, n);

12. The liquid crystal display panel as recited in claim 11, wherein the number of the grayscale colors is one of three or four.

13. The liquid crystal display panel as recited in claim 10, wherein when the data processing circuit process to extending backlight boundary of each backlight partition according to a default condition and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension, the data processing circuit is specifically used for obtaining a grayscale matrix formed by maximum grayscale values of image to be displayed, which the image being corresponding to each backlight partition of the liquid crystal display panel;

determining the number of adjacent partitions with extended backlight boundary, which the adjacent partition being in each backlight partition, then extending backlight boundary of each backlight partition by using the number;

determining a backlight opening coefficient after the boundary expansion of each backlight partition by the grayscale matrix and the minimum extension coefficient of each backlight partition of the liquid crystal display panel;

wherein the minimum extension coefficient is determined by a pixel partition corresponding to the partition.

14. The liquid crystal display panel as recited in claim 13, wherein when the data processing circuit obtains a grayscale matrix formed by maximum grayscale values of image to be displayed which the image of each backlight partition of the liquid crystal display panel, the data processing circuit is specifically used for:

obtaining sequentially the grayscale values of the image to be displayed of each backlight partition, to obtain a number corresponding to each grayscale values of backlight partition;

comparing the number corresponding to each grayscale values with a default number threshold, to obtain a grayscale value larger than the number threshold, and determining the maximum grayscale value that the number larger than the number threshold, which treated as the maximum grayscale value corresponding to backlight partition.

15. The liquid crystal display panel as recited in claim 13, when the data processing circuit detects the maximum grayscale value in any partition as 0, determining the default grayscale value as the maximum grayscale value of the partition.

16. The liquid crystal display panel as recited in claim 13, wherein the minimum extension coefficients of the adjacent symmetric partitions corresponding to each backlight partition are the same.

17. The liquid crystal display panel as recited in claim 11, wherein when the liquid crystal display panel obtains characteristic data of output image of each backlight partition of the liquid crystal display panel based on the characteristic data of the input image and the driving current, the liquid crystal display panel is specifically used for:

obtaining an output image outdata(height, width, n) of each backlight partition by formula (2);

outdata(height,width,n)=min(1,Lum_new(height,width))×

indata(height,width,n) 

 

(2)

wherein the Lum_new(height, width) is the image resolution corresponding to the drive current, the height is the resolution of height of the image, the width is the resolution of width of the image, n is the number of grayscale colors.

18. A liquid crystal display, wherein the liquid crystal display comprises a liquid crystal display panel, and the liquid crystal display panel comprises a data input circuit, a data processing circuit, a driving circuit, and a display circuit, and wherein the input circuit, the driving circuit and the display circuit are connected to the data processing circuit respectively and electrically, and the display circuit is further connected to the driving circuit;

the data input circuit used for normalizing an image to be displayed, which the image corresponding to each backlight partition of the liquid crystal display panel, to obtain characteristic data of the input image;

the data processing circuit used for extending backlight boundary of each backlight partition according to a default condition, and determining a backlight opening coefficient of each backlight partition by data information after the backlight boundary extension;

the backlight opening coefficient of each backlight partition subjected to a fusion process, to obtain a driving current of the liquid crystal display panel;

obtaining characteristic data of output image of each backlight partition of the liquid crystal display panel based on the characteristic data of the input image and the driving current;

the display circuit used for displaying an output image in accordance with the characteristic data of the output image by the driving current to drive the display current.