Computer graphics processing and selective visual display system – Data responsive crt display control – Data responsive deflection control
Reexamination Certificate
2000-10-16
2003-03-04
Liang, Regina (Department: 2674)
Computer graphics processing and selective visual display system
Data responsive crt display control
Data responsive deflection control
C345S023000
Reexamination Certificate
active
06529176
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a horizontal bidirectional deflection system image display which is suitable for display of a highly precise image.
BACKGROUND ART
In recent years, digital techniques have been developed, and particularly the costs of large-capacity memories are reduced. The applications of image processing techniques using the memories have significantly progressed. In JP-A-8-172543, a bidirectional deflection system CRT (Cathode-Ray Tube) display has been proposed in order to reduce the power consumption at a high horizontal scanning frequency.
When the bidirectional deflection system CRT display which has been proposed in the prior art is put on the market as an actual image display such as a monitor apparatus for display or a television receiver, the function of graphically displaying set contents, channels, and the like by OSD (On Screen Display) is required.
FIG.
13
(
a
) is a diagram showing an example of display of a video signal and an OSD graphic signal in conventional forward scanning, FIG.
13
(
b
) is a diagram showing a phase relationship among a horizontal synchronizing signal, a video signal, a graphic signal (character signal), and a display switching control signal at the time of the forward scanning.
In FIG.
13
(
a
), an ellipse on each of forward scanning lines L
1
, L
2
, and L
3
indicates an on-screen display by the graphic signal. In FIG.
13
(
b
), the video signal is outputted when the display switching control signal is at a low level, while the graphic signal is outputted when the display switching control signal is at a high level. Display by the video signal as well as on-screen display by the graphic signal are thus performed in each of forward scanning periods.
However, a technique for performing on-screen display in the bidirectional deflection system image display has not been established.
On the other hand, in the television receiver, a technique for enhancing the contour of an image using a method of horizontal speed modulation to improve focusing characteristics of a CRT has been widely employed. In JP-A-6-284309, the application of a speed modulation technique to a bidirectional deflection system has been proposed.
In the bidirectional deflection system image display, however, on-screen display and horizontal speed modulation are difficult to perform.
Therefore, it is desired to establish a technique making on-screen display possible in the bidirectional deflection system image display as well as to further establish a technique for performing horizontal speed modulation in the bidirectional deflection system image display capable of performing such on-screen display.
An object of the present invention is to provide a bidirectional deflection system image display capable of performing on-screen display.
Another object of the present invention is to provide a bidirectional deflection system image display capable of performing on-screen display and horizontal speed modulation.
Still another object of the present invention is to provide a horizontal speed modulator (horizontal velocity modulator) used for a bidirectional deflection system image display capable of performing on-screen display.
DISCLOSURE OF INVENTION
An image display according to an aspect of the present invention is an image display for displaying an image by forward scanning and backward scanning, comprising inverting means for inverting on the time axis a video signal and a graphic signal which correspond to the backward scanning; switching and outputting means for switching and outputting the video signal and the graphic signal which correspond to the forward scanning and switching and outputting the video signal and the graphic signal, which have been inverted, corresponding to the backward scanning; and display means for displaying the video signal and the graphic signal which have been outputted by the forward scanning and the backward scanning.
Therefore, the video signal and the graphic signal can be displayed by the forward scanning and the backward scanning. Consequently, a bidirectional deflection system image display capable of performing on-screen display is realized.
An image display according to another aspect of the present invention is an image display for displaying an image by forward scanning and backward scanning, comprising video signal inverting means for alternately inverting the output order of an inputted video signal between the forward scanning and the backward scanning; graphic signal generating means for generating a graphic signal; graphic signal inverting means for alternately inverting the output order of the graphic signal generated by the graphic signal generating means between the forward scanning and the backward scanning; display signal switching means for switching the display of the video signal outputted from the video signal inverting means and the graphic signal outputted from the graphic signal inverting means; switching and inverting means for alternately inverting the order of switching by the display signal switching means between the forward scanning and the backward scanning; and display means for displaying the video signal and the graphic signal which are outputted from the display signal switching means by the forward scanning and the backward scanning.
In the image display, the output order of the inputted video signal is alternately inverted between the forward scanning and the backward scanning, and the output order of the graphic signal is alternately inverted between the forward scanning and the backward scanning. The display of the video signal and the graphic signal is switched. In this case, the order of switching is alternately inverted between the forward scanning and the backward scanning. Therefore, the video signal and the graphic signal are displayed by the forward scanning and the backward scanning.
Consequently, a bidirectional deflection system image display capable of performing on-screen display is realized.
An image display according to still another aspect of the present invention is an image display for displaying an image by forward scanning and backward scanning, comprising synthesizing means for synthesizing a video signal and a graphic signal which correspond to the forward scanning and the backward scanning; inverting means for inverting on the time axis the video signal and the graphic signal, which have been synthesized, corresponding to the backward scanning; and display means for displaying by the forward scanning the video signal and the graphic signal, which have been synthesized, corresponding to the forward scanning, and displaying by the backward scanning the video signal and the graphic signal, which have been inverted, corresponding to the backward scanning.
Therefore, the video signal and the graphic signal can be displayed by the forward scannig and the backward scanning. Consequently, a bidirectional deflection system image display capable of performing on-screen display is realized.
An image display according to still another aspect of the present invention is an image display for displaying an image by forward scanning and backward scanning, comprising graphic signal generating means for generating a graphic signal; synthesizing means for synthesizing an inputted video signal and the graphic signal outputted from the graphic signal generating means; video signal inverting means for alternately inverting the output order of the video signal and the graphic signal which have been synthesized by the synthesizing means between the forward scanning and the backward scanning; and display means for displaying the video signal and the graphic signal which are outputted from the video signal inverting means by the forward scanning and the backward scanning.
In the image display, the video signal and the graphic signal which are inputted are synthesized. The output order of the video signal and the graphic signal which have been synthesized is alternately inverted between the forward scanning and the backward scanning.
Therefore, the video signal and the gra
Monta Hiroki
Nio Yutaka
Nishikawa Yutaka
Okumura Naoji
Tanaka Kazuto
Armstrong Westerman & Hattori, LLP
Liang Regina
Matsushita Electric - Industrial Co., Ltd.
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