Electro-optical device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsJun Koyama, Kazutaka Inukai, Shunpei Yamazaki, Mai Osada
Life of this patent
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Abstract
An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.
Claims15
1-16. (canceled)
An electro-optical device comprising a plurality of pixels over a substrate, each of the plurality of pixels comprising:
- a gate signal line;
- a power source supply line;
- a first thin film transistor having a first gate electrode, a first source region, and a first drain region, wherein the gate signal line is electrically connected to the first gate electrode;
- a second thin film transistor having a second gate electrode, a second source region, and a second drain region, wherein one of the first drain region and the first source region is electrically connected to the second gate electrode;
- and
- an electroluminescent element comprising a first electrode, a second electrode, and an electroluminescent layer interposed between the first electrode and the second electrode, wherein one of the second drain region and the second source region is electrically connected to the first electrode, and the other of the second drain region and the second source region is electrically connected to the power source supply line,
- wherein the gate signal line and the power source supply line are parallel to each other.
An electro-optical device comprising a plurality of pixels over a substrate, each of the plurality of pixels comprising:
- a gate signal line;
- a power source supply line;
- a first thin film transistor having a plurality of gate electrodes, a first source region, and a first drain region, wherein the gate signal line is electrically connected to the plurality of gate electrodes;
- a second thin film transistor having a second gate electrode, a second source region, and a second drain region, wherein one of the first drain region and the first source region is electrically connected to the second gate electrode;
- and
- an electroluminescent element comprising a first electrode, a second electrode, and an electroluminescent layer interposed between the first electrode and the second electrode, wherein one of the second drain region and the second source region is electrically connected to the first electrode, and the other of the second drain region and the second source region is electrically connected to the power source supply line,
- wherein the gate signal line and the power source supply line are parallel to each other.
Dependencies are inferred from the claim text.