Matsushita Electric Industrial Co., Ltd.

Nippon Hoso' Kyokai

Panasonic Corporation

Kunio Sekimoto

Takeshi Morimoto

Chojuro Yamamitsu

Isao Kawahara

Katsuhiko Yamamoto

Kozo Kurashina

Katsumi Adachi

Kunio Suesada

Yoshinobu Oba

Sigekazu Togashi

Tadashi Nakayama

Isao Kawahaea

Hiroshi Takahara

Hitoshi Tsuge

Yoshinori Kobayashi

Hiroshi Taniguchi

Ryoji Asada

Ichiro Arimura

Atsuhiro Yamano

Toshiaki Koya

Makoto Yamakura

Seigo Asada

Masahiko Matsui

Kunjo Suesada

Kiyoshi Hirai

An image display apparatus for displaying gray-scale images by writing display information to an image display area of a panel. The display information includes values of a plurality of sub-fields that constitute one field. The image display apparatus converts an input image signal into a piece of display information so that a difference between sub-fields in correspondence with each other in adjacent high gray-scale levels becomes less. The image display apparatus displays a gray-scale image in accordance with the piece of display information.

Image display apparatus for writing display information with reduced electric consumption

The present invention provides a method of driving an active matrix display device in which one frame comprises a plurality of sub-frames each comprising a write time and a hold time and gray scale driving is brought about by the cumulative effect of the hold times. Gray scale display driving is carried out by randomly scanning scan lines other than one predetermined scan line in a predetermined sequence in the hold time of each sub-frame corresponding to the one predetermined scan line so that any one sub-frame is not written to any one scan line more than once and one frame is such that in each of the scan lines, the writings and the hold time of each of the sub-frames is ensured to bring about gray scale display. Through this means, the frame period is shortened.

Active matrix display device and method of driving the same

An image display device comprises a first storage device () for storing an image data, an image processor () for reducing the number of bits of the image data, a second storage device () for storing the image data after being processed, a display device () for displaying the image data after being processed, a driver () for driving the display device () and a controller () for controlling the operation of the driver (). The controller () determines whether the image data stored in the first storage device () is dynamic or static, and, in the case of a static image, after storing the signals corresponding to one frame of the image data in the second storage device (), operates only the second storage device (), the driver () and the display device (). Thereby, reduction of power consumption can be achieved while maintaining high image quality.

Image display device

An image display apparatus which displays images, suppressing the occurrence of the moving image false edge. The image display apparatus selects a signal level among a plurality of signal levels in accordance with a motion amount of an input image signal, where each signal level is expressed by an arbitrary combination of 0, W1, W2, . . . and WN and luminance weights W1, W2, . . . and WN are assigned to subfields.

Image display apparatus and image evaluation apparatus

An image display apparatus which displays images, suppressing the occurrence of the moving image false edge. The image display apparatus selects a signal level among a plurality of signal levels in accordance with a motion amount of an input image signal, where each signal level is expressed by an arbitrary combination of 0, W,W,. . . and WN and luminance weights W,W,. . . and WN are assigned to subfields.

An apparatus for processing a progressive scanning video signal comprising a progressive to interlaced signal converter is provided. An input progressive scanning video signal is switched over alternately every one horizontal scanning line of progressive scanning so as to be divided into a main original signal and a sub-original signal. A time interval of the main original signal is expanded so as to convert the main original signal into a main signal having a period of horizontal scanning of interlaced scanning, whereas a time interval of the sub-original signal is expanded so as to convert the sub-original signal into a sub-signal having the period of the horizontal scanning of the interlaced scanning. Further, a synchronizing process is performed on the time-expanded main signal and the time-expanded sub-signal so as to output an interlaced scanning signal including the main signal and the sub-signal in synchronous with each other, and so that the main signal and the sub-signal start respectively from a pair of two horizontal lines which is continuously inputted after the first horizontal scanning line of the input progressive scanning video signal.

Apparatus for processing progressive scanning video signal comprising

A recording apparatus of the present invention includes selective guard adding means for predicting, at the time of editing, positions of adjacency of new tracks to previously recorded tracks obtained at the time of completion of new track recording, and adds, at the time of editing, guards to locations where disturbance due to residue of erasing of the same azimuth might occur in order to remove or reduce the disturbance due to residue of erasing of the same azimuth caused at the editing point. When performing reproduction from a recording medium whereon tracks recorded by heads of at least two kinds of azimuth angles are disposed alternately and a plurality of tracks are handled as one recording unit and recorded, a reproducing apparatus of the present invention is so configured that the center of each of heads located at both ends of reproducing heads may be shifted to the inside as compared with each corresponding recording track. When disturbance due to the residue of erasing of the same azimuth occurs at the editing point, therefore, more signals of tracks to be originally reproduced can be reproduced, resulting in a greater resistance to disturbance of the same azimuth.

Magnetic reproducing apparatus and magnetic recording and reproducing

A recording and reproducing apparatus includes two recording heads, two re-recording heads and one erasing head. The two recording heads are utilized to record directly adjacent recording tracks having no guard band therebetween. The adjacent recording tracks constitute a recording track set, and a plurality of such recording track sets are recorded on a recording medium such that a guard band is provided between adjacent ones of the recording track sets. The erasing head has an erasing width which is greater than a corresponding width of each recording track set, and it utilized to erase an already recording track set which was recorded using the two recording heads. The re-recording heads each have a recording width which is greater than that of each of the two recording heads, and are utilized to record newly recorded track sets in place of the already recorded track sets erased by the erasing head.

Apparatus for recording and reproducing signals which provides guard

Magnetic reproducing apparatus and magnetic recording apparatus with

A sampling frequency down-converting apparatus low-pass converts a digital picture signal sampled at a sampling frequency of 8 Fsc by a thinning out operation into the digital picture signal sampled at a frequency of 4 Fsc, and a sampling frequency up-converting apparatus high-pass converts the digital picture signal sampled at 4 Fsc into one sampled at 8 Fsc by interpolation. If the signal is wider in the required zone than the conventional NTSC signal and the signal like the ATV signal, the transmission and the recording may be effected without the deterioration of the frequency characteristics.

Sampling frequency down-converting apparatus

A video signal recording and reproducing apparatus includes a first device for inputting a video signal and a second device for recording the video signal as component signals. In addition, a third device serves to generate a color frame signal from color frame information contained in the video signal. A fourth device serves to record the color frame signal. A fifth device serves to reproduce the component signals and the color frame signal. A sixth device serves to output the reproduced component signals and the reproduced color frame signal.

Video signal recording and reproducing apparatus

Magnetic recording and reproducing system using preceding and lagging

Apparatus for processing video signal

Growing community of inventors

Katano, Japan

Kunio Sekimoto