Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2002-03-11
2003-09-02
Nguyen, Chanh (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S092000
Reexamination Certificate
active
06614415
ABSTRACT:
FIELD OF THE INVENTION AND RELATED ART
The present invention relates to a display apparatus wherein three primary color images are successively or sequentially displayed in a short period of time and recognized as a full-color image by an observer.
As a display apparatus, a liquid crystal apparatus has been used in various equipment, such as personal computers, and in recent years, the liquid crystal apparatus has been desired to be adapted for color display.
As one scheme for effecting color display, as shown in
FIG. 4
, a scheme wherein one frame period (F
1
, F
2
, . . . ) is equally divided into three periods in which three color images of red (R), green (G) and blue (B) are successively displayed in a short period of time (i.e., in each of the three periods), respectively, and the resultant color images are memorized in human eyes as an afterimage, thus causing the observer to recognize the afterimage as a full-color image for each frame period (hereinafter, referred to as “three primary color sequential display scheme”) has been proposed.
According to this scheme, the resultant liquid crystal apparatus has the advantages of an increase in apparent resolution by about three times an ordinary liquid crystal apparatus using color filters, a reduction in production costs since the apparatus is not required to use color filters and an increase in an aperture (opening) ratio by about three times the ordinary liquid crystal apparatus to lower a power consumption.
However, in such a liquid crystal apparatus according to a three primary color sequential display scheme, any one of the color images (R, G, B) is always displayed. As a result, in the case of motion (moving) picture display, image qualities of a full-color image recognized in a frame period F
1
just before the frame period F
2
, i.e., deteriorated by the influence of an afterimage phenomenon such that the color images of R, G and B in the preceding frame period F
1
are left as an afterimage still in the frame period F
2
.
More specifically, referring to
FIG. 4
, the last color image (B) in the frame period F
1
is liable to overlap with the first color image (R) in the subsequent frame period F
2
, thus failing to obtain a desired hue in the frame period F
2
(color drift or shift). Further, in the case where a color of a prescribed color value (e.g., white) is displayed based on the three color images (R, G, B) in the frame period F
1
and another color of a different color value (e.g., black) is displayed based on those in the subsequent frame period F
2
, a desired color value is not obtained in the frame period F
2
in some cases, thus resulting in gray display state under the influence of the white color image in the preceding frame period F
1
(image blur).
SUMMARY OF THE INVENTION
An object of the present invention is to provide a display apparatus capable of preventing deterioration in image qualities even in the case of motion picture color display.
According to the present invention, there is provided a display apparatus, comprising:
an optical modulation device including a plurality of pixels and a pair of electrodes to which a voltage is applied,
an illumination device for illuminating the optical modulation device instantaneously and successively with a plurality of monochromatic lights of different colors in a prescribed period to provide a full-color image in combination with application of the voltage to the electrodes of the optical modulation device thereby effecting a full-color display over a succession of the prescribed period, and
control means for dividing each prescribed period into two periods including a first period for displaying a full-color image at each pixel and a second period immediately after the first period and for placing the optical modulation device in a non-display state.
Herein, the term “instantaneously” means a sufficient short period of time to the extent that an observer visually recognizes the color light illumination state as a state such that the color lights are apparently continuously turned on and are not recognized as a succession of a lighting-on state and a lighting-off state.
This and other objects, features and advantages of the present invention will become more apparent upon a consideration of the following description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings.
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patent: 4927243 (1990-05-01), Taniguchi et al.
patent: 4952032 (1990-08-01), Inoue et al.
patent: 5192945 (1993-03-01), Kusada
patent: 5748164 (1998-05-01), Handschy et al.
patent: 5777593 (1998-07-01), Kondoh
patent: 6064362 (2000-05-01), Brownlow et al.
patent: 6115015 (2000-09-01), Fujita et al.
patent: 6151004 (2000-11-01), Kaneko
patent: 8-95526 (1996-04-01), None
Mizutani Hidemasa
Onitsuka Yoshihiro
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Nguyen Chanh
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