Display device and electoric device having the same
It is an object of the present invention to provide a display device where power consumption can be suppressed and the number of gray scales can be increased without a scanning line driver circuit on both sides of a pixel portion. In a display device having a scanning line driver circuit, a shift register included in the scanning line driver circuit has 4m-stage (m is a natural number) flip-flop circuits in every m scanning lines, and a signal which selects the scanning line in a first half period of one scanning line selection period and a signal which selects the scanning line in a second half period of the one scanning line selection period are output to the scanning line by another start pulse.
1. A display device comprising:
a scanning line driver circuit; and
m scanning lines (m is a natural number of greater than or equal to 2) electrically connected to the scanning line driver circuit,
wherein 4k-stage (k is a natural number) flip-flop circuits corresponding to each of the m scanning lines are provided in a shift register included in the scanning line driver circuit,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an i-th scanning line (1≦i≦m−1) is electrically connected to an input of a first stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an (i +1)-th scanning line, and
wherein a level shifter is configured to amplify directly an output of the first stage flip-flop circuit of the 4k-stage flip-flop circuits.
2. A display device according to claim 1 , wherein selection signals is output from any one of the 4k-stage flip-flop circuits.
3. A display device according to claim 1 , wherein a start pulse is input from a side of a flip-flop circuit corresponding to first scanning line.
4. A display device according to claim 1 , wherein, in a preceding stage of a flip-flop circuit corresponding to first scanning line to which a start pulse is input, in the scanning line driver circuit, at least one flip-flop circuit is further provided.
5. An electronic device having the display device according to claim 1 .
6. A display device comprising:
a scanning line driver circuit; and
m (m is a natural number of greater than or equal to 2) scanning lines electrically connected to the scanning line driver circuit,
wherein 4k-stage (k is a natural number) flip-flop circuits corresponding to each of first to (m −1)-th scanning lines are provided, and at least one-stage flip-flop circuit corresponding to m-th scanning line is provided, in a shift register included in the scanning line driver circuit,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an i-th scanning line (1≦i≦m−2) is electrically connected to an input of a first stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an (i +1)-th scanning line,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to the (m−1)-th scanning line is electrically connected to an input of the one-stage flip-flop circuit corresponding to the m-th scanning line, and
wherein a level shifter is configured to amplify directly an output of the first stage flip-flop circuit of the 4k-stage flip-flop circuits.
7. A display device according to claim 6 , wherein selection signals is output from any one of the 4k-stage flip-flop circuits.
8. A display device according to claim 6 , wherein a start pulse is input from a side of a flip-flop circuit corresponding to first scanning line.
9. A display device according to claim 6 , wherein, in a preceding stage of a flip-flop circuit corresponding to first scanning line to which a start pulse is input, in the scanning line driver circuit, at least one flip-flop circuit is further provided.
10. An electronic device having the display device according to claim 6 .
11. A display device comprising:
a plurality of pixels:
a signal line driver circuit electrically connected to the plurality of pixels;
a scanning line driver circuit electrically connected to the plurality of pixels; and
m scanning lines (m is a natural number of greater than or equal to 2) electrically connected to the scanning line driver circuit,
wherein 4k-stage (k is a natural number) flip-flop circuits corresponding to each of the m scanning lines are provided in a shift register included in the scanning line driver circuit,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an i-th scanning line (1≦i ≦m−1) is electrically connected to an input of a first stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an (i +1)-th scanning line, and
wherein a level shifter is configured to amplify directly an output of the first stage flip-flop circuit of the 4k-stage flip-flop circuits.
12. A display device according to claim 11 , wherein selection signals is output from any one of the 4k-stage flip-flop circuits.
13. A display device according to claim 11 , wherein a start pulse is input from a side of a flip-flop circuit corresponding to first scanning line.
14. A display device according to claim 11 , wherein, in a preceding stage of a flip-flop circuit corresponding to first scanning line to which a start pulse is input, in the scanning line driver circuit, at least one flip-flop circuit is further provided.
15. A display device according to claim 11 , wherein the plurality of pixels, the signal line driver circuit, and the scanning line driver circuit are provided on a same substrate.
16. A display device according to claim 11 , wherein the plurality of pixels are each provided with a light-emitting element, a transistor for driving the light-emitting element, and a transistor for selecting a pixel.
17. An electronic device having the display device according to claim 11 .
18. A display device comprising:
a plurality of pixels:
a signal line driver circuit electrically connected to the plurality of pixels;
a scanning line driver circuit electrically connected to the plurality of pixels; and
m (m is a natural number of greater than or equal to 2) scanning lines electrically connected to the scanning line driver circuit,
wherein 4k-stage (k is a natural number) flip-flop circuits corresponding to each of first to (m −1)-th scanning lines are provided, and at least one-stage flip-flop circuit corresponding to m-th scanning line is provided, in a shift register included in the scanning line driver circuit,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an i-th scanning line (1≦i≦m−2) is electrically connected to an input of a first stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to an (i +1)-th scanning line.,
wherein an output of a fourth stage flip-flop circuit of 4k-stage flip-flop circuits corresponding to the (m−1)-th scanning line is electrically connected to an input of the one-stage flip-flop circuit corresponding to the m-th scanning line, and
wherein a level shifter is configured to amplify directly an output of the first stage flip-flop circuit of the 4k-stage flip-flop circuits.
19. A display device according to claim 18 , wherein selection signals is output from any one of the 4k-stage flip-flop circuits.
20. A display device according to claim 18 , wherein a start pulse is input from a side of a flip-flop circuit corresponding to first scanning line.
21. A display device according to claim 18 , wherein, in a preceding stage of a flip-flop circuit corresponding to first scanning line to which a start pulse is input, in the scanning line driver circuit, at least one flip-flop circuit is further provided.
22. A display device according to claim 18 , wherein the plurality of pixels, the signal line driver circuit, and the scanning line driver circuit are provided over a same substrate.
23. A display device according to claim 18 , wherein the plurality of pixels are each provided with a light-emitting element, a transistor for driving the light-emitting element, and a transistor for selecting a pixel.
24. An electronic device having the display device according to claim 18 .