| 摘要 |
<p>A parallel circuit technology for obtaining a uniform luminance of a lighting device is provided to prevent a light intensity from being decreased by applying a constant current to plural light emitting devices. A first current is supplied from a voltage source(11) to the nearest light emitting device(21) through a first resistor(12). The first current from the nearest light emitting device is flown to a ground potential(24) through second and third resistors(16,17). A second current is applied to a second light emitting device(22) from the voltage source through the first resistor and a fourth resistor(13). The second current from the second light emitting device is flown to the ground potential through the second and third resistors. The third current is supplied to a third light emitting device(23) from the voltage source through the resistors, which are connected between the first and fourth resistors. The third current from the third light emitting device is flown to the ground potential through the third resistor.</p> |
