EP 0464620 A3 19921223 - IMAGE INFORMATION CONTROL APPARATUS AND DISPLAY SYSTEM
Title (en)
IMAGE INFORMATION CONTROL APPARATUS AND DISPLAY SYSTEM
Publication
Application
Priority
JP 17110290 A 19900627
Abstract (en)
[origin: EP0464620A2] An image information control apparatus includes a partial write detector having at least two types of memory units for detecting and storing addresses accessed to a VRAM in units of lines in a scanning direction, thereby repeating the detection and the storage at different cycles, a circuit for performing calculations to recognize partial write information from contents of each of the memory units, memory units for storing the respective calculation results, a circuit for comparing the memory contents to determine a size relationship between partial write areas, a partial write ID signal controller for controlling a partial write ID signal on the basis of the size relationship between partial write areas and externally outputting the signal, and a circuit for, even when partial writing is being executed, forcibly interrupting the partial writing in accordance with a state of an external refresh control signal, starting refresh, and restarting the partial writing in accordance with a partial write state and a change in state of the refresh control signal. <IMAGE>
IPC 1-7
IPC 8 full level
G02F 1/133 (2006.01); G09G 3/36 (2006.01)
CPC (source: EP KR)
G09G 3/00 (2013.01 - KR); G09G 3/3629 (2013.01 - EP); G09G 3/3651 (2013.01 - EP); G09G 2310/04 (2013.01 - EP)
Citation (search report)
- [A] EP 0368117 A2 19900516 - CANON KK [JP]
- [A] EP 0361471 A2 19900404 - CANON KK [JP]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0464620 A2 19920108; EP 0464620 A3 19921223; EP 0464620 B1 19961120; AT E145492 T1 19961215; DE 69123182 D1 19970102; DE 69123182 T2 19970424; JP 2840398 B2 19981224; JP H0458221 A 19920225; KR 920001418 A 19920130; KR 950012016 B1 19951013
DOCDB simple family (application)
EP 91110530 A 19910626; AT 91110530 T 19910626; DE 69123182 T 19910626; JP 17110290 A 19900627; KR 910010799 A 19910627