Display apparatus
First Claim
1. An electroluminescent apparatus comprising:
- a substrate;
a transistor formed above the substrate, the transistor including a gate electrode;
a first electrode extended from the gate electrode of the transistor;
a pixel electrode coupled to the transistor;
an opposite electrode disposed opposite the pixel electrode;
a luminescent element disposed between the pixel electrode and the opposite electrode;
a common power supply line supplying a current to the luminescent element through the transistor, a portion of the common power supply line disposed in confrontation with the first electrode;
an inner layer insulation film disposed between the first electrode and the portion of the common power supply line disposed in confrontation with the first electrode; and
a holding capacitor formed by the first electrode, the portion of the common power supply line disposed in confrontation with the first electrode, and the inner layer insulation film.
1 Assignment
0 Petitions
Accused Products
Abstract
A display apparatus, that includes current driving type luminescent elements, has a driving system that takes the conduction types of TFTs to control the emission of the luminescent elements into consideration. In order to reduce driving voltage and improve display quality simultaneously, the arrangement is provided such that if the second TFT which performs the “on-off” function of the current for the luminescent element is of an N channel type, the potential of the common power supply line (“com”) is lowered below the potential of the opposite electrode (“op”) of the luminescent element to obtain a higher gate voltage (“Vgcur”). In this case, if the first TFT connected to the gate of the second TFT is of a P channel type, when using the potential of the potential-holding electrode (“st”) at the “on” state as a reference, potentials of the scanning signal (“Sgate”) at the lower potential and the common power supply line (“com”) are rendered of the same polarities with respect to this potential of the potential-holding electrode (“st”). Therefore, the potential of the image signal (“data”) to turn “on” can be shifted within the range of the driving voltage in the display apparatus in the direction to reduce resistances at the “on” states of the first TFT and the second TFT to reduce driving voltage and improve display quality.
109 Citations
3 Claims
-
1. An electroluminescent apparatus comprising:
-
a substrate;
a transistor formed above the substrate, the transistor including a gate electrode;
a first electrode extended from the gate electrode of the transistor;
a pixel electrode coupled to the transistor;
an opposite electrode disposed opposite the pixel electrode;
a luminescent element disposed between the pixel electrode and the opposite electrode;
a common power supply line supplying a current to the luminescent element through the transistor, a portion of the common power supply line disposed in confrontation with the first electrode;
an inner layer insulation film disposed between the first electrode and the portion of the common power supply line disposed in confrontation with the first electrode; and
a holding capacitor formed by the first electrode, the portion of the common power supply line disposed in confrontation with the first electrode, and the inner layer insulation film. - View Dependent Claims (2, 3)
-
Specification