JPS6476092A - Image display device - Google Patents
Image display deviceInfo
- Publication number
- JPS6476092A JPS6476092A JP62232226A JP23222687A JPS6476092A JP S6476092 A JPS6476092 A JP S6476092A JP 62232226 A JP62232226 A JP 62232226A JP 23222687 A JP23222687 A JP 23222687A JP S6476092 A JPS6476092 A JP S6476092A
- Authority
- JP
- Japan
- Prior art keywords
- display
- systems
- crt
- plotting speed
- level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Digital Computer Display Output (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
PURPOSE: To reduce memory capacity and to improve plotting speed by using a circuit constituted of a CRT controller, a frame memory and a shift register as two systems. CONSTITUTION: The circuit constituted of the CRT controller 1, the frame memory 2 and the shift register 3 is used as two systems. This device is provided with a circuit generating a multi-level signal expressing that the display is multi-level display when a scanning line exists at a window part, and uses an output bit number variable type output controller 4 changing the effective number of bits of display data output S3 and the kind of the data by using the multi-level signal and a priority system signal for deciding the order of priority of two systems. In the case the multi-level display and superimposed display are simultaneously executed on a CRT, a necessary storage quantity in substance becomes half and the number of bits per dot becomes half. Thus, the plotting speed becomes double, the memory capacity is reduced, and the plotting speed is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232226A JPS6476092A (en) | 1987-09-18 | 1987-09-18 | Image display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232226A JPS6476092A (en) | 1987-09-18 | 1987-09-18 | Image display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6476092A true JPS6476092A (en) | 1989-03-22 |
Family
ID=16935954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62232226A Pending JPS6476092A (en) | 1987-09-18 | 1987-09-18 | Image display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6476092A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6636233B1 (en) | 1999-02-18 | 2003-10-21 | Nec Electronics Corporation | Apparatus for processing two-dimensional images and method of doing the same |
-
1987
- 1987-09-18 JP JP62232226A patent/JPS6476092A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6636233B1 (en) | 1999-02-18 | 2003-10-21 | Nec Electronics Corporation | Apparatus for processing two-dimensional images and method of doing the same |
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