Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Utility Patent
1997-08-07
2001-01-02
Chow, Dennis-Doon (Department: 2775)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S062000, C345S063000, C345S067000, C315S169400
Utility Patent
active
06169527
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a technique for driving a display panel consisting of display cells each having a memory function, and particularly, to a plasma display apparatus and a plasma display panel (PDP) capable of displaying interlaced images with reduced unnaturalness appearing on the first and the last display lines.
Images displayed on a display apparatus are classified into noninterlaced images and interlaced images. The noninterlaced images are displayed frame by frame with the use of every display lines in every frame. The interlaced images are displayed frame by frame by alternately using odd and even display lines, i.e., odd display lines in a given frame and even display lines in the next frame. The noninterlaced images are used to display, for example, fine characters an a computer display apparatus. The interlaced images are used to display, for example, animation on a television set. The present invention relates to a plasma display apparatus that displays interlaced images.
2. Description of the Related Art
Japanese Unexamined Patent Publication No. 9-160525 of the assignee of the present application discloses a plasma display apparatus for displaying interlaced images. The apparatus employs sustaining discharge electrodes that have slits along them. These slits serve as display lines. The apparatus alternately drives odd and even ones of the display lines field by field. As a result, a range of the display lines driven in odd fields vertically deviates by one display line from a range of the display lines driven in even fields. Then, a viewer sees oscillating images on the apparatus and this may give an unnatural feeling. In this way, the oscillating images deteriorate the display quality of the apparatus.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a plasma display apparatus and a plasma display panel capable of displaying interlaced images without flicker on first and last display lines, thereby improving the display quality thereof.
In order to accomplish the object, the present invention provides a plasma display apparatus having shades for shading part of light emitted from first and last display lines, to reduce flicker. The apparatus has a plasma display panel consisting of first and second substrates, electrodes arranged in parallel with one another on at least one of the first and second substrates, discharge gas filled in a space between the first and second substrates, and a drive circuit for applying a voltage to the electrodes. Slits, each formed between an adjacent pair of the electrodes, serve as display lines. When a voltage is applied to the electrodes, the electrodes discharge and the display lines emit light. Odd and even ones of the display lines are alternately activated to display interlaced images. The shades block part of light emitted from each end display line.
The plasma display apparatus of the present invention shades and decreases the intensity of light from each end display line that causes flicker, thereby improving display quality.
The shades may block about half of light emitted from each end display line that causes flicker. When sustaining discharge electrodes provide display lines, the shades are structured to cover an outer one of a pair of sustaining discharge electrodes that form each end display line.
The shades may be arranged between the one of the first and second substrates that is on the display side and the space filled with the discharge gas. The shades may be arranged between the display-side substrate and a dielectric layer that covers the electrodes formed on the display-side substrate, so that the flicker reducing effect is independent of a view angle.
The shades may be black insulators.
The present invention is applicable not only to both standard plasma display panels and the one disclosed in the Japanese Unexamined Patent Publication No. 8-194320 for displaying interlaced images but also to any plasma display panel that displays interlaced images.
REFERENCES:
patent: 5099173 (1992-03-01), Kim et al.
patent: 5103328 (1992-04-01), Numao
patent: 5400046 (1995-03-01), Ilcisin et al.
patent: 5436634 (1995-07-01), Kanazawa
patent: 5615026 (1997-03-01), Koden
patent: 5789761 (1998-08-01), Ihara et al.
patent: 2 657 713 (1991-08-01), None
patent: 4-34819 (1992-02-01), None
patent: 9-160525 (1997-06-01), None
patent: 91-8438 (1991-10-01), None
Patent Abstracts of Japan, vol. 6, No. 55 (E-101), Apr. 10, 1982 & JP A 56-167237 (Fujitsu Ltd), Dec. 22, 1981.
Patent Abstracts of Japan, vol. 97, No. 6, Jun. 30, 1997 & JP A 09-049909 (Fujitsu General Ltd), Feb. 18, 1997.
Kanazawa Yoshikazu
Ueda Toshio
Awad Amr
Chow Dennis-Doon
Fujitsu Limited
Staas & Halsey , LLP
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