公开(公告)号：DE3585461D1

公开(公告)日：1992-04-09

申请号：DE3585461

申请日：1985-05-10

Applicant: IBM

Inventor： AOKI YUTAKA ROOM NO ,  WATANABE SHINPEI

IPC: G09G5/00 ,  G06F3/147 ,  G06F3/153 ,  G06T11/00 ,  G09G5/02 ,  G09G5/39 ,  G09G1/28 ,  G09G1/16

Abstract: A color image display apparatus includes an image memory comprising a plurality of memory planes, each corresponding to a specific color. The memory planes are simultaneously addressed by a common address from a CPU so as to either write image data on data busses respectively connected thereto or read image data out to these data busses. The apparatus also includes a read/write circuit comprising means for distributing the image data to be written in the image memory to the data bus of each memory plane, first selecting means for selecting one or more memory planes in which the image data are to be written, a plurality of read registers corresponding to the respective memory planes, and second selecting means for selecting one or more read registers whose contents are to be outputted to the CPU. In this apparatus, the write operation is performed in only a selected memory plane or planes while the read operation is performed in all of the memory planes simultaneously.