Tri-state Switching to Select Display Elements for Matrix Panel Display

Abstract

This paper describes an analog 3-state switching circuit which supplies current to display elements to set the display or undisplay state of the matrix display panel. The circuit consists of two groups of complementary transistors, and supplies either positive current, negative current or isolation by three control voltages. When applied to the matrix circuit, elements can be collectively selected in the row or the column.
Experimental results are verified through results of circuit analysis using Ebers-Moll's model. The source voltage and the control voltage are determined by considering the maximum load current. The 3-state circuit design and the matrix display circuit design with 3-state circuits are simple and power is not consumed during the display or the undisplay state.