| 摘要 |
PURPOSE:To increase the operability, by displaying an alarm and drawing the attention of the operator on a screen by making the characters displayed on a CRT freely convertible to white or black in contrary. CONSTITUTION:Displayed characters of a character display such as CRT can be inverted to white/black. For example, a display device consits of a flip-flop 4 inputting 7-bit of a character data 1 and an OR gate 5 inputting the outputof a shift register 3. Thus, the 7-bit of the character data 1 is taken as logical 1, the flip- flop 4 is set with an LDC signal. Then the output VIDEO signal of the OR gate 5 is inverted with an output of the shift resister 3 and display with white/black inversion can be made on a CRT screen. |
