Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-03-20
2001-12-11
Liang, Regina (Department: 2624)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S090000
Reexamination Certificate
active
06329973
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an image display for displaying image data on an image display part constructed by a display pixel array.
Conventional techniques will be described hereinbelow with reference to
FIGS. 8 and 9
.
FIG. 8
shows a first conventional example of an image display. A data communication line for supplying compressed image information and a CD-ROM
34
serving as a database are connected to an image data generating apparatus
81
. Image data generated by the image data generating apparatus
81
is sequentially inputted to a liquid crystal driver
82
serving as an image data writing means. The liquid crystal driver
82
transfers the image data to a TFT liquid crystal panel
84
constructed by a pixel array. A shift register
83
is provided at the end of the TFT panel
84
.
The operation of the first conventional technique will be described. In accordance with a request of the image data generating apparatus
81
, image information compressed according to the MPEG
1
standard is supplied from the communication line or the CD-ROM
34
to the image data generating apparatus
81
. The image data generating apparatus
81
sequentially inputs image data of each frame to the liquid crystal driver
82
. Each time the image data of pixels of one horizontal line is accumulated, the liquid crystal driver
82
inputs the image data pixels of one horizontal line in a lump to the TFT liquid crystal panel
84
. The shift register
83
sequentially designates the row on the pixel array to which the image data is inputted.
The image display having such a TFT liquid crystal display is described, for example, in S. Kaneko, “Color TFT Liquid Crystal Display”,
Journal of the Institute of Electronics, Information and Communication Enqineers of Japan
, Vol. 78, No. 7, pp. 662-667, July 1995 (in Japanese.).
FIG. 9
shows a second conventional technique of the image display. A data communication line for supplying compressed image information and the CD-ROM
34
as a database are connected to an image data generating apparatus
91
. Image data generated by the image data generating apparatus
91
is inputted to a liquid crystal driver
92
as an image data writing means. The liquid crystal driver
92
transfers the image data to a ferroelectric liquid crystal panel
94
constructed by a pixel array. A decoder
93
is provided at an end of the ferroelectric liquid crystal panel
94
.
The operation of the second conventional technique will be described. In accordance with a request of the image data generating apparatus
91
, image information compressed according to the MPEG
1
standard is supplied from the communication line or the CD-ROM
34
to the image data generating apparatus
91
. The image data generating apparatus
91
inputs image data of only rows including a part (called a moving picture part) changed from the previous frame as rewriting part image data to the liquid crystal driver
92
. Each time image data of (one row of) pixels of one horizontal line is accumulated, the liquid crystal driver
92
inputs the image data of pixels of one horizontal line in a lump to the ferroelectric liquid crystal panel
94
. The decoder
93
designates a row on the pixel array to which the image data is inputted. With respect to a still picture part, previous rewriting image data is stored by using a memory function of the ferroelectric liquid crystal.
The image display having the ferroelectric liquid crystal display is described, for example, in Y. Inaba et al., “Ferroelectric LCD”,
Journal of the Institute of Electronics, Information and Communication Engineers of Japan
, Vol. 78, No. 7, pp. 676-679, July 1995 (in Japanese).
SUMMARY OF THE INVENTION
According to the first conventional technique, all of the display pixels are rewritten every frame. Since the number of display pixels are as small as, for example, about (640×480), it is not so difficult. However, in order to realize a high picture quality image display in which the number of display pixels is (thousands×thousands), a rewriting speed of the display pixels is increased by one order of magnitude. It is therefore difficult to realize the display by using the rewriting operation of the first conventional technique.
According to the second conventional technique, the rewriting part in a frame is reduced by using the memory function of the ferroelectric liquid crystal, thereby reducing the rewriting amount per unit time. It is, however, substantially difficult for the ferroelectric liquid crystal to store data at a multivalued level and the ferroelectric liquid crystal cannot store a full color still image. In order to display the full color still image, it is therefore necessary to rewrite every frame. In a manner similar to the first conventional technique, a problem of the display pixel rewriting speed occurs also in the second conventional technique.
It is an object of the invention to provide an image display in which a problem of a rewriting speed does not occur.
The object can be achieved by an image display for displaying image data on an image display part constructed by a display pixel array, in which the display pixel array has an image data inputting means which can input image data so that the display pixel array has two neighboring areas having different frame rates (>0).
The object can be also achieved by providing image data inputting means which can input at least one moving image data and at least one still image data to an image display part at different frame rates (>0).
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S. Kaneko, “Color TFT Liquid Crystal Color Display”,Journal of the Institute of Electronics, Information and Communication Engineers of Japan, vol. 78, No. 7, pp. 662-667, Jul. 1995 (in Japanese).
Y. Inaba et al., “Ferroelectric LCD”,Journal of the Institute of Electronics, Information ofCommunication Engineers and Japan, vol. 78, No. 7, pp. 676-679, Jul. 1995, (in Japanese).
Akimoto Hajime
Akioka Takashi
Hiraki Mitsuru
Kaneko Yoshiyuki
Mikami Yoshiro
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Liang Regina
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