Liquid crystal displaying method

• US 7,106,286 B2
• Filed: 03/12/2003
• Issued: 09/12/2006
• Est. Priority Date: 03/12/2002
• Status: Active Grant

• Current Assignee: Hisense Visual Technology Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Baba, Masahiro, Okumura, Haruhiko
• Primary Examiner(s): LAO, LUN YI
• Application Number:
  US10/385,718
• Publication Number:
  US 20030174110A1
• Time in Patent Office: 1,280 Days
• Field of Search: 345 88- 89, 345/204, 345/90, 345/100, 348791-792
• US Class Current: 345/88
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A liquid crystal displaying method includes: multiplying, a difference value of luminance information and a difference value of color-difference information each by an emphasis coefficient α (α is a positive real number); adding the luminance information in which the input image information has been delayed for one frame period and the color-difference information in which the input image information has been delayed for one frame period to the difference value of the luminance information multiplied by the emphasis coefficient α and the difference value of the color-difference information multiplied by the emphasis coefficient α, respectively, to obtain emphasized image information. The difference value of the luminance information is the luminance information of the input image information having the luminance information and the color-difference information subtracted from the luminance information in which the input image information has been delayed for one frame period. The difference value of the color-difference information is the color-difference information of the input image information subtracted from the color-difference information in which the input image information has been delayed for one frame period.

Claims

1. A liquid crystal displaying method, comprising:

multiplying a difference value of luminance information and a difference value of color-difference information each by an emphasis coefficient α

(α

is a positive real number), the difference value of the luminance information being the luminance information of input image information having the luminance information and the color-difference information subtracted from the luminance information in which the input image information has been delayed for one frame period, the difference value of the color-difference information being the color-difference information of the input image information subtracted from the color-difference information in which the input image information has been delayed for one frame period;

adding the luminance information in which the input image information has been delayed for one frame period and the color-difference information in which the input image information has been delayed for one frame period to the difference value of the luminance information multiplied by the emphasis coefficient α and

the difference value of the color-difference information multiplied by the emphasis coefficient α

, respectively, to obtain emphasized image information; and

displaying the emphasized image information on a liquid crystal display apparatus.

2. The liquid crystal displaying method according to claim 1, further comprising:

in the case that gray-scale level of the liquid crystal display apparatus changes from an initial gray-scale level to an arrival gray-scale level, writing gray-scale level to the liquid crystal display apparatus for arriving at the arrival gray-scale level after one frame period is set to emphasized gray-scale level, and

determining the emphasis coefficient α

from a relationship between at least two difference values of gray-scale level obtained by subtracting each of at least two initial gray-scale levels from the arrival gray-scale level and at least two difference values of emphasized gray-scale level obtained from subtracting each of the at least two initial gray-scale levels from the emphasized gray-scale level.

3. The liquid crystal displaying method according to claim 1, wherein, in the case that all of the absolute difference value of the luminance information and the absolute difference value of the color-difference information of a certain pixel are lower than a predetermined value, the emphasis coefficient α

of its pixel is a positive real number of not more than 1.

4. The liquid crystal displaying method according to claim 1, wherein, in the case that the absolute difference value of the luminance information of a certain pixel is lower than a predetermined value, the emphasis coefficient α

of its pixel is a positive real number of not more than 1.

5. The liquid crystal displaying method according to claim 1, wherein the emphasis coefficient α

is set by a user of the liquid crystal display apparatus.

6. The liquid crystal displaying method according to claim 1, wherein the emphasis coefficient α

is determined from information type which indicates whether the input image information is imaged or not.

7. The liquid crystal displaying method according to claim 1, wherein, in case that a frame rate of the input image information is different from a refresh rate of the liquid crystal display apparatus, when the input image information displayed on the liquid crystal display apparatus changes from an n-th frame (n is an integer) to an n+1-th frame,

multiplying the difference value of the luminance information obtained by subtracting the luminance information of the n-th frame from the luminance information of the n+1-th frame of the input image information by the emphasis coefficient α

,

multiplying the difference value of the color-difference information obtained by subtracting the color-difference information of the n-th frame from the color-difference information of the n+1-th frame of the input image information by the emphasis coefficient α

,

displaying, on the liquid crystal display apparatus, the emphasized image obtained by adding the luminance information of the n-th frame and the color-difference information of the n-th frame to the difference value of the luminance information multiplied by the emphasis coefficient α and

the difference value of the color-difference information multiplied by the emphasis coefficient α

, respectively, and,

displaying, on the liquid crystal display apparatus, the input image information as is when a display image does not change.

8. The liquid crystal displaying method according to claim 2, wherein the emphasis coefficient α

is obtained by a calculation of least squares.

9. The liquid crystal displaying method according to claim 2, wherein, in the case that all of the absolute difference value of the luminance information and the absolute difference value of the color-difference information of a certain pixel are lower than a predetermined value, the emphasis coefficient α

of its pixel is a positive real number of not more than 1.

10. The liquid crystal displaying method according to claim 2, wherein, in the case that the absolute difference value of the luminance information of a certain pixel is lower than a predetermined value, the emphasis coefficient α

of its pixel is a positive real number of not more than 1.

11. The liquid crystal displaying method according to claim 2, wherein the emphasis coefficient α

is set by a user of the liquid crystal display apparatus.

12. The liquid crystal displaying method according to claim 2, wherein the emphasis coefficient α

is determined from the information type which indicates whether the input image information is imaged or not.

13. The liquid crystal displaying method according to claim 2, wherein, in case that a frame rate of the input image information is different from a refresh rate of the liquid crystal display apparatus, when the input image information displayed on the liquid crystal display apparatus changes from an n-th frame (n is an integer) to an n+1-th frame,

multiplying the difference value of the luminance information obtained by subtracting the luminance information of the n-th frame from the luminance information of the n+1-th frame of the input image information by the emphasis coefficient α

,

multiplying the difference value of the color-difference information obtained by subtracting the color-difference information of the n-th frame from the color-difference information of the n+1-th frame of the input image information by the emphasis coefficient α

,

displaying, on the liquid crystal display apparatus, the emphasized image obtained by adding the luminance information of the n-th frame and the color-difference information of the n-th frame to the difference value of the luminance information multiplied by the emphasis coefficient α and

the difference value of the color-difference information multiplied by the emphasis coefficient α

, respectively, and,

displaying, on the liquid crystal display apparatus, the input image information as is when a display image does not change.