| 摘要 |
PURPOSE:To enable miniaturization, the decrease of the number of external extraction wirings and the simplification, etc., of assembly, and to integrate parts easily by using a switching element array capable of selectively transferring an ON state to other switching elements successively and a light-emitting element array. CONSTITUTION:A switching element T31 is brought to an ON state by starting pulses, and gate potential reaches approximately zero V. On the other hand, potential 5V by a power supply VGK is applied by a resistor RL regarding the gate potential G21 of a switching element T21 through a diode D21. Gate potential G41 through a diode D31 reaches approximately 1V. Consequently, the gate voltage of light-emitting memory elements S21, S31 and S41 is also set at voltage 5V, 0V and 2V corresponding to the voltage of the gates G21, G31 and G41 of the elements T21, T31 and T41. As a result, when DC potential of Ch2-Ch4 is set previously between 1V-2V, only the element S31 corresponding to the turned-ON element T31 in a switching element array SR1 is light-emitted. Accordingly, a plurality of transmitted optical signals can be selected independently by a plurality of the addresses sides, thus allowing high reliability at low cost. |
