DISPLAY DEVICES AND DISPLAYING METHODS

• US 20170103696A1
• Filed: 10/27/2015
• Published: 04/13/2017
• 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
• Granted Patent: US 10,013,908 B2
• Time in Patent Office: Days
• 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 displaying method of display devices, comprising:

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;

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 the pure-color pixel, the grayscale value of the sub-pixel, which is larger than zero, is selectively filled into 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;

when the current original pixel is not the 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;

filling the grayscale values of the base-color sub-pixels of the current sub-pixels of the current sampled pixels respectively in 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

filling the grayscale value of the fourth sub-pixel of the current sampled pixel into the fourth sub-pixel of the current sampled pixel.

2. The displaying method as claimed in claim 1, wherein the step of selectively filling the grayscale value of the sub-pixel larger than zero into 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 filled into 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 filled into 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 filled into 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 filled into the third sub-pixel and the fourth sub-pixel of the previous sampled pixel.

3. The displaying 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 displaying 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 displaying 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<sub>i−

1</sub>+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 displaying method of display devices, comprising:

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;

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; and

filling the grayscale values of the base-color sub-pixels of the current sub-pixels of the current sampled pixels respectively in the base-color sub-pixels of the current sampled pixels.

7. The displaying 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 filled into 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 displaying 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 filling the grayscale value of the sub-pixel larger than zero into 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 filled into 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 filled into 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 filled into 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 filled into the third sub-pixel and the fourth sub-pixel of the previous sampled pixel.

9. The displaying 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

filling the grayscale value of the fourth sub-pixel of the current sampled pixel into the fourth sub-pixel of the current sampled pixel.

10. The displaying 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 displaying 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<sub>i−

1</sub>|}

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, G<sub>i−

1</sub>, G_i+1, 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_{B13 max}}

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

12. The displaying 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<sub>C_max∈

[</sub>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*h₁₊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 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.

13. A display device, comprising:

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

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

a weight determination unit determining weighted factors corresponding to current sampled pixels of a sampled image in accordance with the maximum grayscale degree;

a summing unit calculating the 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 value of the base-color sub-pixel of the current sub-pixel of the current sampled pixel; and

a filling unit respectively filling the grayscale values of the base-color sub-pixels of the current sub-pixels of the current sampled pixels into the base-color sub-pixels of the current sampled pixels.

14. The display device as claimed in claim 13, wherein the device further comprises:

a determination unit determines whether the current original pixel is the base-color sub-pixel in accordance with the grayscale values of each of the base-color sub-pixels of the current original pixel, the grayscale degree calculation unit calculates the grayscale degree of the base-color sub-pixel of the sub-pixels of the current original pixel when the current original pixel is not the pure-color pixel; and

a control unit fills the grayscale values of the sub-pixel having the grayscale value larger than zero into the corresponding sub-pixel of the current sampled pixel or the previous sampled pixel in accordance with the locations of the sub-pixels having the grayscale value larger than zero and the location of the current sub-pixel of the current sampled pixel.

15. The display device as claimed in claim 14, 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 control unit is configured for:

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 filled into 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 filled into 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 filled into 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 filled into the third sub-pixel and the fourth sub-pixel of the previous sampled pixel.