Seiko Epson Corporation

Michio Yoshitake

Kazuya Takita

Noriyoshi Chiba

Kazuyoshi Utsumi

Michitoshi Ishihara

In an image display apparatus, when image data is transferred from an LCD controller to an LCD through a transmission cable having a plurality of signal lines and is displayed on a screen, the image data is divided sequentially by a plurality of lines from a front line so as to correspond to the number of signal lines and allocates the divided image data to the signal lines such that image data of which signal change is larger is allocated to a signal line which is closer to the ground line to transfer the image data. Therefore, the entire radiation noise which is generated can be reduced while maintaining quality of signals.

Image display apparatus and method of controlling the same

Provided is a screen display control device including: a compression unit which compresses image data; a rewritable video memory in which the data compressed by the compression unit of image data of one frame including line data (Y (Y: natural number) pixels/one line) of X (X: natural number) lines is written asynchronously with reading; an expansion unit which expands the compressed data which is periodically read from the video memory in synchronization with a frame period of a screen display, and restores original image data; a display unit which displays an image of the image data expanded and restored by the expansion unit; an input image data holding unit which holds input image data of one frame including line data (X pixels/one line) of Y lines by M (M: natural number, M&#x3c;Y) lines; and a data replacement control unit which performs a replacement process.

Screen display control device

A screen display control device includes: a compression unit which compresses input image data in a line unit; a rewritable image memory to which the compressed data compressed in the line unit by the compression unit is written in non-synchronization with a reading process; a decompression unit which decompresses the compressed data periodically read from the image memory in synchronization with screen display to restore original image data; a display unit which displays an image of the image data decompressed and restored by the decompression unit; a buffer memory which temporarily maintains one-line data of the image data; and a writing/reading control unit which controls the process of writing the compressed data to the image memory and the processes of writing and reading the image data to and from the buffer memory.

A screen display control device includes: a compression unit which compresses input image data in a line unit; a rewritable image memory to which the compressed data compressed in the line unit by the compression unit is written in non-synchronization with a reading process; a decompression unit which decompresses the compressed data periodically read from the image memory in synchronization with screen display to restore original image data; a display unit which displays an image of the image data decompressed and restored by the decompression unit; a buffer memory which temporarily maintains compressed one-line data compressed by the compression unit; and a writing/reading control unit which controls the processes of writing and reading the compressed data to and from the image memory and processes of writing and reading the image data to and from the buffer memory. When the processes of reading and writing the compressed data of the same line to and from the image memory compete with each other, the writing/reading control unit controls the image data of the line to be written so as to be maintained in the buffer memory. The writing/reading control unit controls the process of reading the compressed data of the line maintained in the buffer memory upon reading the compressed data of the line.

A printing system that comprises a host computerand a printerin combination. As the printeris used one that can process a first class print request including a control program and print data and a second class print request including only print data, and, when an ID output request is received, sends a control program ID as identification information of a control program stored inside the printerat that point of time. Printer control softwareis installed on the host computerto put the computerin a state that, when a print request is to be outputted to the printerthe computerverifies whether a required control program is stored within the printerand the computersends a second class print request to the printerwhen storing of the control program is verified, and sends a first class print request to the printerwhen storing of the control program is not verified. Thus, it is possible to realize a printing system including a such type of printer that can process print data of various language and downloads a control program, having a shorter average time required for printing.

Growing community of inventors

Fukuoka, Japan

Michio Yoshitake