Patent ID: 7843408
Filing Date: 2010-11-30
Classification: G09G,H01L

Abstract:
1. A light emitting device comprising: a light emitting element and a first transistor and a second transistor each for controlling current to be supplied to the light emitting element, which are formed in a pixel, wherein a threshold voltage of the first transistor is higher than a threshold voltage of the second transistor, wherein a channel length of the first transistor is longer than a channel width thereof, wherein a channel length of the second transistor is equal to or shorter than a channel width thereof, wherein gate electrodes of the first transistor and the second transistor are connected to each other, wherein each polarity of the first transistor and the second transistor is p-type, wherein the light emitting element, the first transistor and the second transistor are all connected in series, wherein one of a source region and a drain region of the first transistor is connected to the light emitting element, wherein the other one of the source region and the drain region of the first transistor is connected to one of a source region and a drain region of the second transistor, wherein the first transistor and the second transistor share a same semiconductor island, and wherein the semiconductor island comprises a channel forming region of the first transistor and the second transistor.