Display control apparatus of scanning type display
US4367466A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1981 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Jun 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A screen of a scanning type display is divided both in the horizontal and vertical directions or abscissa and ordinate directions into a relatively large number of dots, so that the screen comprises an arrangement of dots (of the total number of the relatively large number by the relatively large number) arranged in the horizontal and vertical directions. The arrangement of dots of the screen is divided into columns each having a relatively small number of dots in the horizontal or abscissa direction. Each column is identified by a corresponding ordinal number so that the same may be the abscissa information. On the other hand, each row of each column is identified by a corresponding ordinal number so that the same may be the ordinate information. Two line buffer memories are provided for storing display control information of lines which are different by a predetermined number of lines in the vertical direction. These line buffer memories are alternately controlled such that while one is in a write mode the other is in a read mode, whereby the same are alternately changed to the write mode and the read mode for each line of the horizontal scanning lines. Character information is r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.