JPS6423282A - Signal detection circuit for display device - Google Patents
Signal detection circuit for display deviceInfo
- Publication number
- JPS6423282A JPS6423282A JP62179370A JP17937087A JPS6423282A JP S6423282 A JPS6423282 A JP S6423282A JP 62179370 A JP62179370 A JP 62179370A JP 17937087 A JP17937087 A JP 17937087A JP S6423282 A JPS6423282 A JP S6423282A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- signal
- input
- inputted
- display device
- 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
- Controls And Circuits For Display Device (AREA)
Abstract
PURPOSE: To make it easy to switch a display by detecting whether or not there is an input signal from >=2 signal sources and outputting the result as a 1-bit or 2-bit control signal, and then automatically switching the display device with it. CONSTITUTION: In the figure, A is an input terminal for a video signal of TTL level of a personal computer and B is an input terminal for a composite video signal from a VCR, etc. When the video signal is inputted from the terminal A to a monostable multivibrator 1, a signal of low level is outputted and inputted to a NAND 4. The signal from the terminal B, on the other hand, has the TTL level through a transistor(TR) 5 and is inputted to a monostable multivibrator 6 and inputted as a high-level signal to the NAND circuit 4. Consequently, the NAND circuit 4 outputs the high-level signal to a terminal C in the presence of the said two inputs or an input to the terminal A. Then when there is no input to the terminal A and there is an input to the terminal B, the output of the NAND circuit 4 is at low level. Consequently, when there is the input to the terminal A, the signal at the terminal A can be displayed on a display device irrelevantly to the input to the terminal B.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179370A JPS6423282A (en) | 1987-07-17 | 1987-07-17 | Signal detection circuit for display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179370A JPS6423282A (en) | 1987-07-17 | 1987-07-17 | Signal detection circuit for display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6423282A true JPS6423282A (en) | 1989-01-25 |
Family
ID=16064664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62179370A Pending JPS6423282A (en) | 1987-07-17 | 1987-07-17 | Signal detection circuit for display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6423282A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6806911B2 (en) | 2000-05-31 | 2004-10-19 | Nec Corporation | Display system with single/dual image modes |
-
1987
- 1987-07-17 JP JP62179370A patent/JPS6423282A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6806911B2 (en) | 2000-05-31 | 2004-10-19 | Nec Corporation | Display system with single/dual image modes |
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