DISPLAY DEVICE, DISPLAY MODULE, AND ELECTRONIC DEVICE

• US 20170270882A1
• Filed: 03/06/2017
• Published: 09/21/2017
• Est. Priority Date: 03/17/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: MORI, Hidenori, MATSUMOTO, Hironori, FUKUTOME, Takahiro
• Granted Patent: US 10,685,614 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0213 controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A display device or the like with a novel structure which can ensure a sufficiently long period for writing data signals in pixels is provided. A display device or the like with a novel structure which can display an image of one frame without greatly degrading display quality is provided. The display device includes a gate driver and a pixel portion. The pixel portion includes a plurality of pixels. The gate driver is configured to output a first scan signal to a first gate line in a first frame period. The gate driver is configured to output a second scan signal to a second gate line in a second frame period. The second gate line is a gate line next to the first gate line. The pixels are configured to hold data signals, which are written in the pixels in the first frame period, in the first frame period and the second frame period.

Claims

1. A display device comprising:

a gate driver; and

a pixel portion,

wherein the pixel portion comprises a plurality of pixels,

wherein the gate driver is configured to output a first scan signal to a first gate line in a first frame period,

wherein the gate driver is configured to output a second scan signal to a second gate line in a second frame period,

wherein the second gate line is a gate line next to the first gate line, and

wherein the plurality of pixels are configured to hold data signals, which are written in the plurality of pixels in the first frame period, in the first frame period and the second frame period.

2. The display device according to claim 1,

wherein the plurality of pixels each comprise a transistor, and

wherein the transistor comprises an oxide semiconductor in a channel formation region.

3. The display device according to claim 1,

wherein the pixel portion comprises a first display region and a second display region,

wherein the first display region is configured to display a still image at a first frame rate,

wherein the second display region is configured to display a moving image at a second frame rate, and

wherein the first frame rate is different from the second frame rate.

4. The display device according to claim 1,

wherein the second scan signal is not output to the second gate line in the first frame period.

5. A display module comprising:

the display device according to claim 1; and

a touch sensor.

6. An electronic device comprising:

the display module according to claim 5; and

at least one of an operation key and a battery.

7. A display device comprising:

a gate driver; and

a pixel portion comprising;

a plurality of pixels;

a first display region; and

a second display region,

wherein the first display region is a region where a first scan signal is output to a first gate line and a second scan signal is output to a second gate line, and

wherein the second display region is a region where a third scan signal is output to a third gate line and a fourth scan signal is output to a fourth gate line,

wherein the gate driver is configured to output the first scan signal, the third scan signal, and the fourth scan signal in a first frame period,

wherein the gate driver is configured to output the second scan signal, the third scan signal, and the fourth scan signal in a second frame period,

wherein the second gate line is a gate line next to the first gate line,

wherein the third gate line is a gate line next to the second gate line,

wherein the fourth gate line is a gate line next to the third gate line, and

wherein the pixels included in the first display region are configured to hold data signals, which are written in the pixels in the first frame period, in the first frame period and the second frame period.

8. The display device according to claim 7,

wherein the plurality of pixels each comprise a transistor, and

wherein the transistor comprises an oxide semiconductor in a channel formation region.

9. The display device according to claim 7,

wherein the first display region is configured to display a still image at a first frame rate,

wherein the second display region is configured to display a moving image at a second frame rate, and

wherein the first frame rate is different from the second frame rate.

10. The display device according to claim 7,

wherein the second scan signal is not output to the second gate line in the first frame period.

11. A display module comprising:

the display device according to claim 7; and

a touch sensor.

12. An electronic device comprising:

the display module according to claim 11; and

at least one of an operation key and a battery.

13. A display device comprising:

a gate driver;

a source driver;

a pixel portion comprising a first pixel and a second pixel;

a data line electrically connected to the first pixel and the second pixel;

a first gate line electrically connected to the first pixel; and

a second gate line electrically connected to the second pixel,

wherein the gate driver is configured to output a first scan signal to the first gate line in a first frame period,

wherein the gate driver is configured to output a second scan signal to the second gate line in a second frame period,

wherein the second gate line is a gate line next to the first gate line,

wherein the source driver is configured to output a data signal to the data line in the first frame period, and

wherein the first pixel is configured to hold the data signal in the first frame period and the second frame period.

14. The display device according to claim 13,

wherein the first pixel and the second pixel each comprise a transistor, and

wherein the transistor comprises an oxide semiconductor in a channel formation region.

15. The display device according to claim 13,

wherein the pixel portion comprises a first display region and a second display region,

wherein the first display region is configured to display a still image at a first frame rate,

wherein the second display region is configured to display a moving image at a second frame rate, and

wherein the first frame rate is different from the second frame rate.

16. The display device according to claim 13,

wherein the second scan signal is not output to the second gate line in the first frame period.

17. A display module comprising:

the display device according to claim 13; and

a touch sensor.

18. An electronic device comprising:

the display module according to claim 17; and

at least one of an operation key and a battery.