| US 7,592,977 B2 | ||
| Plasma display panel and method for processing pictures thereof | ||
| Seung-Ho Park, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung SDI Co., Ltd., Suwon-si (Korea, Republic of) | ||
| Filed on Sep. 01, 2005, as Appl. No. 11/219,051. | ||
| Claims priority of application No. 10-2005-0002818 (KR), filed on Jan. 12, 2005. | ||
| Prior Publication US 2006/0152444 A1, Jul. 13, 2006 | ||
| Int. Cl. G09G 3/28 (2006.01) | ||
| U.S. Cl. 345—63 [345/60] | 16 Claims |
| 1. An image processing method of a plasma display device for expressing a gray level by a combination of a plurality of subfields
divided from a frame of an input video signal, the image processing method comprising:
detecting a moving image block and a still image block from the input video signal;
determining output gray levels corresponding to original gray levels of the detected still image block such that respective
output gray levels corresponding to the original gray levels of the detected still image block satisfy a first condition that
the number of consecutive non-lighting subfields is less than or equal to L among subfields driven previously to a last turn-on
subfield of the corresponding output gray levels;
determining output gray levels corresponding to original gray levels of the detected moving image block such that respective
output gray levels corresponding to original gray levels of the detected moving image block satisfy a second condition that
a number of consecutive non-lighting subfields is less than or equal to M, and a third condition that a total number of non-lighting
subfields is less than or equal to N among subfields driven previously to a last turn-on subfield of the corresponding output
gray levels; and
displaying the determined output gray levels of the detected still image block and moving image on the plasma display device;
wherein when at least one of the original gray levels of the still image block does not satisfy the first condition, the output
gray level corresponding to the at least one of the original gray levels of the still image block is determined by selecting
at least two output gray level candidates satisfying the first condition and by applying a dithering algorithm to the selected
output gray level candidates, and
wherein when at least one of the original gray levels of the moving image block does not satisfy at least one of the second
condition and the third condition, the output gray level corresponding to the at least one of the original gray levels of
the moving image block is determined by selecting at least two output gray level candidates satisfying both of the second
and third conditions and by applying a dithering algorithm to the selected output gray level candidates.
|