Halftone display method and display apparatus for reducing halftone disturbances occurring in moving image portions

Patent 6496194 Issued on December 17, 2002. Estimated Expiration Date:

October 27, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Display device and method for driving the same
Patent #: 5818419
Issued on: 10/06/1998
Inventor: Tajima, et al.

Method of and apparatus for displaying halftone images
Patent #: 5907316
Issued on: 05/25/1999
Inventor: Mikoshiba, et al.

Drive for a display device
Patent #: 6069610
Issued on: 05/30/2000
Inventor: Denda, et al.

Intraframe time-division multiplexing type display device and a method of displaying gray-scales in an intraframe time-division multiplexing type display device Patent #: 6249265
Issued on: 06/19/2001
Inventor: Tajima, et al.

Inventors

Assignee

Mikoshiba; Shigeo

Application

No. 427936 filed on 10/27/1999

US Classes:

345/596, Dither or halftone345/63Intensity control

Examiners

Primary: Saras, Steven
Assistant: Bell, Paul A.

Attorney, Agent or Firm

Staas & Halsey llp

Foreign Patent References

0 720 139 EP. 07/23/1996
0 822 536 EP. 02/23/1998
0 837 441 EP. 04/23/1998
0 840 274 EP. 05/23/1998
2 733 070 FR. 10/23/1996
8-54852 JP. 02/23/1996
8-211848 JP. 08/23/1996
10-39828 JP. 02/23/1998
10-133623 JP. 05/23/1998

International Classes

G09G 005/02
G09G 003/28

Foreign Application Priority Data

1998-07-30 JP

Abstract

A halftone display method utilizes an activation sequence, having a plurality of luminance blocks predefined in each frame or field to display an image and having redundancy, that enables one gray-scale level to be expressed by any one of a plurality of combinations of subframes (luminance blocks). When determining luminance blocks for use to display gray scale of an arbitrary first pixel, the luminance blocks to be used for the first pixel are selected in accordance with a predetermined rule, based on how the luminance blocks are used for a second pixel located in close proximity to the first pixel. In this way, by actively utilizing the redundancy of the activation sequence, the occurrence of moving-image false contours (false color contours) in video can be minimized, and also a motion compensation equalizing pulse method can be effectively applied to further improve the image display quality.