| 摘要 |
PURPOSE:To attain high density with simple constitution by connecting a DC power supply to one side of a selecting switch array of a common side or an individual electrode of a matrix and connecting a signal amplifier having a prescribed input terminal voltage to the other. CONSTITUTION:One of the selecting switch arrays SX1, SX2-SXm of the common side electrode of the matrix and one of the selecting switch array SY1, SY2-SY5 of the individual electrode, e.g., the switch SY1 are switched to a DC power supply E and the other individual side switches are switched to ground so as to close only the switch SX1 and to open the other switches of the common side, thereby selecting a photoelectric conductive element R1. In flowing a current to a load resistor RL from the power supply E, an operational amplifier 2 is activated by using the resistor RL as a feedback resistor so as to make a current flowing to the photoconductive element R1 proportional to the incident luminous amount. |
