This paper describes a warning circuit which can display with threecolour signals whether the measuring result of industrial instruments is right or not to ensure the normal production.
This method provides a feasible approach for dynamic three dimension display, colourthree dimension display and the display of not existing object in reality.
Based on the basic principle of 3-d and colourdisplay, some attempts to the colourdisplay by density separation and three primary colour composition are introduced.