Display devices and displaying methods

• US 10,013,908 B2
• Filed: 10/27/2015
• Issued: 07/03/2018
• Est. Priority Date: 10/13/2015
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Li, Hao
• Primary Examiner(s): Wilson, Nicholas R
• Application Number:
  US14/896,728
• Publication Number:
  US 20170103696A1
• Time in Patent Office: 980 Days
• Field of Search: None
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2340/0428 Gradation resolution change
• CPC Class Codes: G09G 3/2044 using dithering
• CPC Class Codes: G09G 3/2074 using sub-pixels

Abstract

A display device and the displaying method are disclosed. The method includes calculating grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel, selecting a maximum grayscale degree from the grayscale degrees, determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree, and calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel. In this way, the overlapped color issue may be eliminated so as to obtain a clear image.

Claims

1. A method of displaying an image on a displaying device, comprising:

obtaining grayscale values of sub-pixels of a current original pixel and original pixels adjacent to the current original pixel of an original image;

determining whether the current original pixel is a pure-color pixel in accordance with the grayscale values of each of the base-color sub-pixels of the current original pixel;

when the current original pixel is a pure-color pixel, the grayscale value of the sub-pixel, which is larger than zero, is set as a grayscale value of a corresponding sub-pixel of a current sampled pixel or a previous sampled pixel in accordance with a location of the sub-pixel of the current original pixel having the grayscale value larger than zero and the location of the current sub-pixel of the current sampled pixel; and

when the current original pixel is not a pure-color pixel, the method further comprises;

calculating grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel, and selecting a maximum grayscale degree from the grayscale degrees;

determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree;

calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel;

setting the grayscale values of the base-color sub-pixels of the current sub-pixels of the current sampled pixels respectively as grayscale values of the base-color sub-pixels of the current sampled pixels;

wherein the current original pixel and the current sampled pixel respectively comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel arranged in sequence, the first sub-pixel, the second sub-pixel, and the third sub-pixel are the base-color sub-pixels, and the fourth sub-pixel is not the base-color sub-pixel, after the step of obtaining the grayscale values of sub-pixels of the current original pixel and the original pixels adjacent to the current original pixel of the original image, the method further comprises;

selecting the maximum grayscale value from the grayscale values of the fourth sub-pixels of the current original pixel and the adjacent original pixels to obtain the grayscale value of the fourth sub-pixel of the current sampled pixel; and

setting the grayscale value of the fourth sub-pixel of the current sampled pixel as a grayscale value of the fourth sub-pixel of the current sampled pixel.

2. The method as claimed in claim 1, wherein the step of selectively setting the grayscale value of the sub-pixel larger than zero as a grayscale value of the corresponding sub-pixel of the current sampled pixel or the previous sampled pixel further comprises:

when the sub-pixel having the grayscale value larger than zero is the first sub-pixel or the second sub-pixel of the current original pixel and the current sub-pixel is the first sub-pixel or the second sub-pixel of the current sampled pixel, the grayscale values of the first sub-pixel and the second sub-pixel of the current original pixel are respectively set as grayscale values of the first sub-pixel and the second sub-pixel of the current sampled pixel;

when the sub-pixel having the grayscale value larger than zero is the first sub-pixel or the second sub-pixel of the current original pixel and the current sub-pixel is the third sub-pixel or the fourth sub-pixel of the current sampled pixel, the grayscale values of the first sub-pixel and the second sub-pixel of the current original pixel are respectively set as grayscale values of the first sub-pixel and the second sub-pixel of the current sampled pixel;

when the sub-pixel having the grayscale value larger than zero is the third sub-pixel or the fourth sub-pixel of the current original pixel and the current sub-pixel is the third sub-pixel or the fourth sub-pixel of the current sampled pixel, the grayscale values of the third sub-pixel and the fourth sub-pixel of the current original pixel are respectively set as grayscale values of the third sub-pixel and the fourth sub-pixel of the current sampled pixel; and

when the sub-pixel having the grayscale value larger than zero is the third sub-pixel or the fourth sub-pixel of the current original pixel and the current sub-pixel is the first sub-pixel or the second sub-pixel of the current sampled pixel, the grayscale values of the third sub-pixel and the fourth sub-pixel of the current original pixel are respectively set as grayscale values of the third sub-pixel and the fourth sub-pixel of the previous sampled pixel.

3. The method as claimed in claim 1, wherein the current sampled pixel comprises at least two sub-pixel sets, the sub-pixel of one of the sub-pixel sets is the current sub-pixel of the current sampled pixel, and the current original pixel corresponds to one sub-pixel set of the current sub-pixel contained by the current sampled pixel.

4. The method as claimed in claim 1, wherein the step of calculating grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel comprises:

calculating the grayscale degrees by the equations;

GL_{R_max}=max{|R<sub>i−

1</sub>−

R_i|,|R_i−

R_i+1|}

GL_{G_max}=max{|G<sub>i−

1</sub>−

G_i|,|G_i−

G_i+1|}

GL_{B_max}=max{|B<sub>i−

1</sub>−

B_i|,|B_i−

B<sub>i−

1</sub>|}

wherein and R_i, G_i, B_i respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the current original pixel, R<sub>i−

1</sub>, G<sub>i−

1</sub>, and B<sub>i−

1</sub> respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the previous original pixel adjacent to the current original pixel, R_i+1, G_i+1, and B_i+1 respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the next original pixel adjacent to the current original pixel, the GL_{R_max}, GL_{G_max}, GL_{B_max} respectively relates to the grayscale degrees of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the current original pixel;

the step of selecting the maximum grayscale degree from the grayscale degrees further comprises;

selecting the maximum grayscale degrees from the GL_{R_max}, GL_{G_max}, and GL_{B_max} by the equation;

GL_{C_max}=max{GL_{R_max},GL_{G_max},GL_{B_max}}

wherein GL<sub>C—

max</sub> relates to the maximum grayscale degree.

5. The method as claimed in claim 4, wherein the step of determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree further comprises:

defining a parameter k=GL_{C_max}∈

[0,255];

calculating five weighted factors w₁, w₂, w₃, w₄, w₅ corresponding to the current sampled pixel by the equations below;

w₁=λ

₁*f(x)

w₂=λ

₂*f(x)

w₃=λ

₃*f(x)

w₄=λ

₄*f(x)

w₅=λ

₅*f(x)

wherein f(x)=ax³+bx²+cx+d, x=k255∈

[0,1], a, b, c, and d are fitting coefficients of f(x), and λ

₁, λ

₂, λ

₃, λ

₄, and λ

₅ are weight distribution coefficients;

the step of calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel further comprises;

obtaining the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel by the equation;

h_o=w₁*h<sub>i−

2</sub>+w₂*h<sub>i−

1</sub>+w₃*h_i+w₄*h_i+1+w₅*h_i+2;

wherein h_o relates to the grayscale value of the base-color sub-pixel of the current sub-pixel of the current sampled pixel, h_i relates to the grayscale value of the base-color sub-pixel of the current original pixel, h<sub>i−

2</sub> and h<sub>i−

1</sub> relates to the grayscale values of the base-color sub-pixels of the two previous original pixels adjacent to the current original pixel, and h_i+1 and h_i+2 relates to the grayscale values of the base-color sub-pixels of the two next original pixels adjacent to the current original pixel.

6. A method of display an original image having an image resolution on a displaying device having a display resolution that is less than the image resolution by converting the original image into sampled pixels of a resolution corresponding to the display resolution, comprising:

obtaining grayscale values of sub-pixels of a current original pixel and the original pixels adjacent to the current original pixel of the original image;

calculating grayscale degrees of base-color sub-pixels of the sub-pixels of the current original pixel, and selecting a maximum grayscale degree from the grayscale degrees;

determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree;

calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel; and

setting the grayscale values of the base-color sub-pixels of the current sub-pixels of the current sampled pixels respectively as grayscale values the base-color sub-pixels of the current sampled pixels, wherein the sampled pixels so obtained are displayed on the display device.

7. The method as claimed in claim 6, wherein after the step of obtaining grayscale values of sub-pixels of a current original pixel and the original pixels adjacent to the current original pixel of an original image, the method further comprises:

determining whether the current original pixel is a pure-color pixel in accordance with the grayscale values of each of the base-color sub-pixels of the current original pixel;

calculating grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel, and selecting a maximum grayscale degree from the grayscale degrees when the current original pixel is not the pure-color pixel; and

when the current original pixel is the pure-color pixel, the grayscale value of the sub-pixel, which is larger than zero, is selectively set as a grayscale value of the corresponding sub-pixel of a current sampled pixel or a previous sampled pixel in accordance with location of the sub-pixel of the current original pixel having the grayscale value larger than zero and the location of the current sub-pixel of the current sampled pixel.

8. The method as claimed in claim 7, wherein the current original pixel and the current sampled pixel respectively comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel arranged in sequence, the step of selectively setting the grayscale value of the sub-pixel larger than zero as a grayscale value of the corresponding sub-pixel of the current sampled pixel or the previous sampled pixel further comprises:

when the sub-pixel having the grayscale value larger than zero is the first sub-pixel or the second sub-pixel of the current original pixel and the current sub-pixel is the first sub-pixel or the second sub-pixel of the current sampled pixel, the grayscale values of the first sub-pixel and the second sub-pixel of the current original pixel are respectively set as grayscale values of the first sub-pixel and the second sub-pixel of the current sampled pixel;

when the sub-pixel having the grayscale value larger than zero is the first sub-pixel or the second sub-pixel of the current original pixel and the current sub-pixel is the third sub-pixel or the fourth sub-pixel of the current sampled pixel, the grayscale values of the first sub-pixel and the second sub-pixel of the current original pixel are respectively set as grayscale values of the first sub-pixel and the second sub-pixel of the current sampled pixel;

when the sub-pixel having the grayscale value larger than zero is the third sub-pixel or the fourth sub-pixel of the current original pixel and the current sub-pixel is the third sub-pixel or the fourth sub-pixel of the current sampled pixel, the grayscale values of the third sub-pixel and the fourth sub-pixel of the current original pixel are respectively set as grayscale values of the third sub-pixel and the fourth sub-pixel of the current sampled pixel; and

when the sub-pixel having the grayscale value larger than zero is the third sub-pixel or the fourth sub-pixel of the current original pixel and the current sub-pixel is the first sub-pixel or the second sub-pixel of the current sampled pixel, the grayscale values of the third sub-pixel and the fourth sub-pixel of the current original pixel are respectively set as grayscale values of the third sub-pixel and the fourth sub-pixel of the previous sampled pixel.

9. The method as claimed in claim 6, wherein the current original pixel and the current sampled pixel respectively comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel arranged in sequence, the first sub-pixel, the second sub-pixel, and the third sub-pixel are the base-color sub-pixels, and the fourth sub-pixel is not the base-color sub-pixel, after the step of obtaining the grayscale values of sub-pixels of the current original pixel and the original pixels adjacent to the current original pixel of the original image, the method further comprises:

selecting the maximum grayscale value from the grayscale values of the fourth sub-pixels of the current original pixel and the adjacent original pixels to obtain the grayscale value of the fourth sub-pixel of the current sampled pixel; and

setting the grayscale value of the fourth sub-pixel of the current sampled pixel as a grayscale value of the fourth sub-pixel of the current sampled pixel.

10. The method as claimed in claim 6, wherein the current original pixel and the current sampled pixel respectively comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel arranged in sequence, the current sampled pixel comprises at least two sub-pixel sets, the sub-pixel of one of the sub-pixel sets is the current sub-pixel of the current sampled pixel, and the current original pixel corresponds to one sub-pixel set of the current sub-pixel contained by the current sampled pixel.

11. The method as claimed in claim 6, wherein the current original pixel and the current sampled pixel respectively comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel arranged in sequence, wherein the first sub-pixel, the second sub-pixel, the third sub-pixel are base-color sub-pixels, the step of calculating the grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel further comprises:

calculating the grayscale degrees by the equations;

GL_{R_max}=max{|R<sub>i−

1</sub>−

R_i|,|R_i−

R_i+1|}

GL_{G_max}=max{|G<sub>i−

1</sub>−

G_i|,|G_i−

G_i+1|}

GL_{B_max}=max{|B<sub>i−

1</sub>−

B_i|,|B_i−

B_i+1|}

wherein G_i, G_i, and B_i respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the current original pixel, R<sub>i−

1</sub>, G_i+1, and B<sub>i−

1</sub> respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the previous original pixel adjacent to the current original pixel, R_i+1, G_i+1, and B_i+1 respectively relates to the grayscale values of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the next original pixel adjacent to the current original pixel, the GL_{R_max}, GL_{G_max}, GL_{B_max} respectively relates to the grayscale degrees of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the current original pixel;

the step of selecting the maximum grayscale degree from the grayscale degrees further comprises;

selecting the maximum grayscale degrees from the GL_{R_max}, GL_{G_max}, and GL_{B_max} by the equation;

GL_{C_max}=max{GL_{R_max},GL_{G_max},GL_{B_max}}

wherein GL_{C_max} relates to the maximum grayscale degree.

12. The method as claimed in claim 11,

wherein the step of determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree further comprises:

defining a parameter k=GL_{C_max}∈

[0,255];

calculating five weighted factors w₁, w₂, w₃, w₄, w₅ corresponding to the current sampled pixel by the equations below;

w₁=λ

₁*f(x)

w₂=λ

₂*f(x)

w₃=λ

₃*f(x)

w₄=λ

₄*f(x)

w₅=λ

₅*f(x)

wherein f(x)=ax³+bx²+cx+d, x=k/255∈

[0,1], a, b, c, and d are fitting coefficients of f(x), and λ

₁, λ

₂, λ

₃, λ

₄, and λ

₅ are weight distribution coefficients;

the step of calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel further comprises;

obtaining the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel by the equation;

h_o=w₁*h<sub>i−

2</sub>+w₂*h<sub>i−

1</sub>+w₃*h_i+w₄*h_i+1+w₅*h_i+2;

wherein h_o relates to the grayscale value of the base-color sub-pixel of the current sub-pixel of the current sampled pixel, h_i relates to the grayscale value of the base-color sub-pixel of the current original pixel, h<sub>i−

2</sub> and h<sub>i−

1</sub> relates to the grayscale values of the base-color sub-pixels of the two previous original pixels adjacent to the current original pixel, and h_i+1 and h<sub>i−

2</sub> relates to the grayscale values of the base-color sub-pixels of the two next original pixels adjacent to the current original pixel.