| 摘要 |
An electro-optical device which has a program period, a light-emitting period, an erasing period, and a lights-off period in one frame and controls the light-emitting period according to a light emission gray-scale level including a driving transistor that includes a current control terminal, a current input terminal, and a current output terminal, and controls a current amplifying ratio on the basis of a voltage between the current control terminal and the current input terminal, an electro-optical element that is supplied with the driving current from the driving transistor to emit light, a storage capacitor that stores the charge corresponding to the voltage between the current control terminal and the current input terminal of the driving transistor, a constant current source that outputs a constant current that is independent of the light emission gray-scale level, a voltage source that outputs a driving stop signal that turns off the driving transistor, a selection transistor that opens/closes a current path connecting any one of the constant current source and the voltage source with the driving transistor, and a scan line that outputs open/close signals that turn on/off the selection transistor. The program period is a period when the selection transistor is turned on by outputting an open signal to the scan line, and when the constant current flows from the constant current source to the driving transistor through the current path, the charge corresponding to the voltage between the current control terminal and the current input terminal is stored in the storage capacitor. The light-emitting period is a period when the selection transistor is turned off by outputting a close signal to the scan line, and the voltage corresponding to the charge stored in the storage capacitor is supplied between the current control terminal and the current input terminal of the driving transistor to supply the driving current to the electro-optical element. The erasing period is a period when the selection transistor is turned on by outputting the open signal to the scan line, and the driving stop signal is supplied to the driving transistor from the voltage source through the current path to turn off the driving transistor so that the electro-optical element stops emitting light. The lights-off period is a period when the selection transistor is turned off by outputting the close signal to the scan line, and the electro-optical element retains a non-light-emitting state. A time constant of the scan line is set so that signal delay of the open/close signals is 10% or less of a theoretical value.
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