Display device and electoric device having the same

• US 20070164939A1
• Filed: 01/10/2007
• Published: 07/19/2007
• Est. Priority Date: 01/13/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miyazaki, Aya
• Granted Patent: US 9,165,505 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2310/0216 Interleaved control phases for different scan lines in the same sub-field, e.g. initialization, addressing and sustaining in plasma displays that are not simultaneous for all scan lines
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G11C 19/00 Digital stores in which the information is moved stepwise, e.g. shift registers

Abstract

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.

Claims

1. A display device comprising:

a scanning line driver circuit; and

a plurality of 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 the plurality of scanning lines are provided in a shift register included in the scanning line driver circuit.

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.

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

a plurality of 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 the plurality of scanning lines are provided in a shift register included in the scanning line driver circuit.

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 the 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.

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 the 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 the pixel.

24. An electronic device having the display device according to claim 18.