| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce power consumption required for charging and discharging a source line in an active matrix EL display device. <P>SOLUTION: In a light emitting device concerned with the present invention, a bipolar transistor (Bi1) has a base terminal B connected to an output terminal c1 of an operational amplifier (OP1), a collector terminal C connected to a low power potential (GND), and an emitter terminal E connected to a resistor R2. Moreover, four resistors R1 to R4 are provided. A high power potential (VBH) is a potential being in synchronization with a high power potential of a light emitting element. A potential of the output terminal c1 of the operational amplifier (OP1) is outputted as a buffer low power potential (VBL). The low power potential (VBL) corresponds to a potential difference between the high power potential (VBH) an a high power potential (V1). Accordingly, the low power potential (VBL) can follow the high power potential (VBH), that is a high power potential of the light emitting element. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
