Display pixel having a capacitive electrode with different conductivity type from the switching element

1. A display device comprising:

a display element;

a first scanning line;

a second scanning line;

a data signal line;

a switching element having a first terminal and a second terminal of a first conduction type, said first terminal being connected to said data signal line, and being held in a conducting or non-conducting state according to a voltage applied to said first scanning line; and

a storage capacitance having a first electrode and a second electrode, said second electrode comprising a portion of said second scanning line;

wherein said second terminal of said switching element is connected to said display element and the first electrode of said storage capacitance, said first electrode consisting of a semiconductor film of a second conduction type different from the first conduction type.

2. The display device as set forth in claim 1 ,

wherein while said switching element is held in the conducting state, said storage capacitance is charged from said data signal line via said switching element; and

while said switching element is held in the non-conducting state, said storage capacitance applies a voltage to said display element.

3. The display device as set forth in claim 1 ,

wherein said second terminal of said switching element and said first electrode of said storage capacitance are connected to each other by a conductive material.

4. The display device as set forth in claim 3 ,

wherein said second terminal of said switching element and said first electrode of said storage capacitance are connected to each other by a conductive material deposited in a first contact hole reaching said second terminal of said switching element and a second contact hole reaching said first electrode of said storage capacitance.

5. The display device as set forth in claim 3 ,

wherein said second terminal of said switching element and said first electrode of said storage capacitance are connected to each other by a conductive material deposited in a contact hole reaching said second terminal of said switching element and said first electrode of said storage capacitance.

6. The display device as set forth in claim 3 ,

wherein said conductive material for connecting said second terminal of said switching element and said first electrode of said storage capacitance to each other is identical with a conductive material used for said data signal line.

7. The display device as set forth in claim 1 ,

wherein at least a part of said storage capacitance is formed in a region where there is an overlap between one of said data signal line and said second scanning line.

8. A display device comprising:

a plurality of first scanning lines and second scanning lines;

a plurality of data signal lines;

a plurality of pixels arranged a matrix; and

a driving circuit for said plurality of pixels;

wherein said driving circuit includes:

a switching element having a first terminal and a second terminal of a first conduction type, said first terminal being connected to said data signal line, and being held in a conducting or non-conducting state according to a voltage applied to said first scanning line; and

a storage capacitance having a first electrode and a second electrode, second electrode comprising said second scanning line; and

the second terminal of said switching element is connected to a display element and connected to the first electrode of said storage capacitance, said first electrode a semiconductor film of a second conduction type different from the conduction type of the second terminal.

9. The display device as forth in claim 8 ,

wherein said switching element is a thin film transistor having polycrystalline silicon as a semiconductor layer.