DISPLAY DEVICE

• US 20140184484A1
• Filed: 12/23/2013
• Published: 07/03/2014
• Est. Priority Date: 12/28/2012
• Status: Abandoned Application

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: MIYAKE, Hiroyuki, KIMURA, Hajime, NAKAMURA, Yasuo, NISHIDA, Eriko
• Application Number:
  US14/138,970
• Publication Number:
  US 20140184484A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

To provide a novel display device where display quality does not deteriorate. The display device includes a display portion configured to display a still image at a frame frequency of 30 Hz or lower. The display portion includes a driver circuit, a plurality of wirings, and a pixel portion. The pixel portion comprises a plurality of pixels. Each of the plurality of pixels comprises a transistor, a display element, and a capacitor. A channel is formed in an oxide semiconductor layer included in the transistor. A gate of the transistor is electrically connected to one of the plurality of wirings. The driver circuit performs scanning where the plurality of wirings in one of odd-numbered rows and even-numbered rows are sequentially selected and scanning where the plurality of wirings in the other of the odd-numbered rows and the even-numbered rows are sequentially selected.

Claims

1. A display device comprising:

a display portion configured to display a still image at a frame frequency of 30 Hz or lower,

wherein the display portion comprises a driver circuit, a plurality of wirings, and a pixel portion,

wherein the pixel portion comprises a plurality of pixels,

wherein each of the plurality of pixels comprises a transistor, a display element, and a capacitor,

wherein a channel is formed in an oxide semiconductor layer included in the transistor,

wherein a gate of the transistor is electrically connected to one of the plurality of wirings, and

wherein the driver circuit performs scanning where the plurality of wirings in one of odd-numbered rows and even-numbered rows are sequentially selected and scanning where the plurality of wirings in the other of the odd-numbered rows and the even-numbered rows are sequentially selected.

2. The display device according to claim 1, wherein frame frequency is 0.2 Hz or lower.

3. The display device according to claim 1, wherein the display element is a liquid crystal element.

5. The display device according to claim 2, wherein frame frequency is 0.2 Hz or lower.

6. The display device according to claim 2, wherein the display element is a liquid crystal element.

4. A display device comprising:

a display portion configured to display a still image at a frame frequency of 30 Hz or lower,

wherein the display portion comprises a first driver circuit, a second driver circuit, a plurality of first wirings, a plurality of second wirings, and a pixel portion,

wherein the pixel portion comprises a plurality of pixels,

wherein each of the plurality of pixels comprises a transistor, a display element, and a capacitor,

wherein a channel is formed in an oxide semiconductor layer included in the transistor,

wherein a gate of the transistor is electrically connected to one of the plurality of first wirings,

wherein a source or a drain of the transistor is electrically connected to one of the plurality of second wirings, and

wherein the first driver circuit performs scanning where the plurality of first wirings are sequentially selected and the second driver circuit performs scanning where the plurality of second wirings are sequentially selected.

7. A display device comprising:

a display portion configured to display a still image at a frame frequency of 30 Hz or lower,

wherein the display portion comprises a first driver circuit, a second driver circuit, a plurality of wirings, and a pixel portion,

wherein the pixel portion comprises a plurality of pixels,

wherein each of the plurality of pixels comprises a transistor, a display element, and a capacitor,

wherein a channel is formed in an oxide semiconductor layer included in the transistor,

wherein a gate of the transistor is electrically connected to one of the plurality of wirings, and

wherein the first driver circuit performs scanning where the plurality of wirings in odd-numbered rows are sequentially selected, and

wherein the second driver circuit performs scanning where the plurality of wirings in even-numbered rows are sequentially selected.

8. The display device according to claim 7, wherein frame frequency is 0.2 Hz or lower.

9. The display device according to claim 7, wherein the display element is a liquid crystal element.