LIGHT EMITTING DIODE DRIVING CIRCUIT

• Main Author: NAGANO KATSUMI
• Format: Patent
• Language: English
• Published: 07.06.1989
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

PURPOSE:To parallely drive a light emitting diode by transmitting a voltage, which is proportional to a reference voltage, to a reference resistance, generating a current to be proportional to the reference voltage and supplying this current through a first current amplifying means and the second current amplifying means, which is drive-controlled by a burning control signal, to the light emitting diode. CONSTITUTION:The subject circuit equips a voltage transmitting means VV to transmit the voltage, which is proportional to the reference voltage, to a reference resistance Rref and to generate the current to be proportional to a reference voltage Vref, a first current amplifying means CM1, to amplify the current, which is proportional to the reference voltage Vref, with a prescribed rate and a second current amplifying means CM2, to which the output current of this first current amplifying means CM1 is supplied, to supply a driving current to a light emitting diode LED1 according to the burning control signal. Namely, the voltage, which is proportional to the reference voltage Vref, is transmitted by the voltage transmitting means VV and the current, which is proportional to the reference voltage Vref, is generated. Then, this current is supplied through the first current amplifying means CM1 and the second current amplifying means CM2, which is drive-controlled by the burning control signal, to the light emitting diode LED1. Thus, the light emitting diode LED1 can be parallely driven.