Patent ID: 7405712
Filing Date: 2008-07-29
Classification: G09G

Abstract:
1. An electro-optical device that includes a plurality of data lines, a plurality of first scanning lines, a plurality of second scanning lines, and a plurality of pixels, each of the plurality of pixels comprising: a first transistor Tsig; a second transistor Tprg; a third transistor Tdr; a fourth transistor Trep; a storage capacitor Csig; and an organic EL element, a first electrode of the first transistor Tsig being electrically connected to one of the plurality of data lines, a gate electrode of the first transistor Tsig being electrically connected to one of the plurality of first scanning lines, a first electrode of the second transistor Tprg being electrically connected to a first electrode of the storage capacitor Csig and a gate electrode of the third transistor Tdr, a gate electrode of the second transistor Tprg being electrically connected to the one of the plurality of first scanning lines and the gate electrode of the first transistor Tsig, a first electrode of the third transistor Tdr being electrically connected to a second electrode of the storage capacitor Csig and a Vdd line, a first electrode of the fourth transistor Trep being electrically connected to a second electrode of the first transistor Tsig, a second electrode of the second transistor Tprg, and a second electrode of the third transistor Tdr, a second electrode of the fourth transistor Trep being electrically connected to an electrode of the organic EL element, a gate electrode of the fourth transistor Trep being electrically connected to one of the plurality of second scanning lines, wherein the organic EL element is configured to be turned off such that: the one of the plurality of second scanning lines provides a signal at low level to turn off the fourth transistor Trep; the one of the plurality of data lines provides a light-off signal Vsig to the first electrode of the storage capacitor Csig while the fourth transistor Trep is turned off, a voltage of the light-off signal Vsig being equal to that of a signal provided from the Vdd line; the one of the plurality of first scanning lines provides a signal at high level to turn on the first transistor Tsig and the second transistor Tprg while the fourth transistor Trep is turned off so that the third transistor Tdr is turned off by the light-off signal Vsig and the organic EL element is turned off; the one of the plurality of first scanning lines provides a signal at low level to turn off the first transistor Tsig and the second transistor Tprg so that the light-off signal Vsig keeps the third transistor Tdr turned off; and the one of the plurality of second scanning lines provides a signal at high level to turn on the fourth transistor Trep after the first transistor Tsig, the second transistor Tprg, and the third transistor Tdr are turned off.