A drive circuit is disclosed. The drive circuit includes a first p-typed thin film transistor (PTFT), a second PTFT, a first n-typed thin film transistor (NTFT), a second NTFT and a capacitor. The drain of the first PTFT is coupled to a first electrical line, and the gate thereof is coupled to a first clock line. The drain of the second PTFT is coupled to a second clock line, and the source thereof is coupled to an output. The source of the first NTFT is coupled to a second electrical line, and the gate thereof is couple to an output of a preceding drive circuit. The source of the second NTFT is couple to a third electrical line, the gate thereof is coupled to a third clock line, and the drain thereof is coupled to the output. The capacitor has one end coupled to the second electrical line, while the other end is coupled to the source of the first PTFT, the drain of the first NTFT and the gate of the second PTFT.
1. A drive circuit comprising:
a first p-typed thin film transistor having a source, a drain directly connected to a first electrical line and a gate directly connected to a first clock line different from said first electrical line;
a second p-typed thin film transistor having a gate, a drain coupled to a second clock line and a source coupled to an output;
a first n-typed thin film transistor having a drain, a source directly connected to a second electrical line applied with a first voltage level and a gate directly connected to an output of a preceding drive circuit;
a second n-typed thin film transistor having a source directly connected to a third electrical line applied with a negative voltage level different from said first voltage level, a gate directly connected to a third clock line different from said output of said preceding drive circuit and a drain coupled to said output; and
a capacitor having one end directly connected to said second electrical line and another end directly connected to said source of said first p-typed thin film transistor, said drain of said first n-typed thin film transistor and said gate of said second p-typed thin film transistor.
2. The drive circuit of claim 1 , wherein said gate of said first n-typed thin film transistor has a bi-directional selection function.
3. The drive circuit of claim 1 , wherein any one of:
said second p-typed thin film transistor and said second n-typed thin film transistor comprise a double gate thin film transistor.
4. The drive circuit of claim 1 , wherein said output has an enable function having an output and a drive signal is output from said output of said enable function.
5. The drive circuit of claim 4 , wherein said output is coupled to an input of a next drive circuit.
6. The drive circuit of claim 1 , wherein said drive circuit comprises a gate drive circuit.
7. A display device comprising the drive circuit of claim 6 .
8. An electronic device comprising the drive circuit of claim 1 .
9. The electronic device of claim 8 , wherein said electronic device is selected from any one of:
a mobile phone;
a digital camera;
a personal digital assistant;
an aviation display;
a digital picture frame; and
a DVD player.
10. The drive circuit of claim 1 , wherein said second electrical line is different from said third electrical line.
11. The drive circuit of claim 1 , wherein said capacitor is discharged to the voltage of said second electrical line when the voltage of said output of said preceding drive circuit is at a high voltage level.
12. The drive circuit of claim 1 , wherein said capacitor is charged to the voltage of said first electrical line when the voltage of said first clock line is at a low voltage level.