Circuit, display system, and electronic device

• US 10,152,936 B2
• Filed: 05/16/2017
• Issued: 12/11/2018
• Est. Priority Date: 05/20/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Nakagawa, Takashi, Kurokawa, Yoshiyuki, Yoneda, Seiichi
• Primary Examiner(s): Sheng, Xin
• Application Number:
  US15/596,264
• Publication Number:
  US 20170337888A1
• Time in Patent Office: 574 Days
• Field of Search: None
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/0221 with use of split matrices G09G3/3644 and G09G3/3666 take precedence
• 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 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 3/18 using liquid crystals
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3666 with the matrix divided into sections
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A novel circuit, a novel display portion, a novel display system, or the like is provided. A circuit, a display portion, a display system, or the like which has low power consumption is provided. A plurality kinds of video signals are generated by division of input data and supplied to different pixel groups. Thus, for example, the plurality of video signals can be supplied individually, and the operation states of a plurality of driver circuits can be controlled individually, leading to fine-grained operation with low power consumption. Accordingly, a decoder, a display portion, or a display system having low power consumption can be provided.

Claims

1. A circuit comprising:

a first circuit;

a second circuit;

a third circuit;

a fourth circuit; and

a fifth circuit,

wherein the first circuit is configured to output a first signal corresponding to input data,

wherein the second circuit is configured to generate a first video signal in accordance with the data and the first signal,

wherein the third circuit is configured to generate a second video signal in accordance with the data and the first signal,

wherein the fourth circuit is configured to output the first video signal in the case where the first video signal and a third video signal output from the fourth circuit immediately before input of the first video signal to the fourth circuit do not match,

wherein the fourth circuit is configured to output a second signal corresponding to a result of comparison between the first video signal and the third video signal,

wherein the fifth circuit is configured to output the second video signal in the case where the second video signal and a fourth video signal output from the fifth circuit immediately before input of the second video signal to the fifth circuit do not match,

wherein the fifth circuit is configured to output a third signal corresponding to a result of comparison between the second video signal and the fourth video signal, and

wherein the first video signal and the second video signal are different kinds of video signals.

2. The circuit according to claim 1,

wherein the first video signal is a video signal for displaying a character, and

wherein the second video signal is a video signal for displaying a video other than a character.

3. A display system comprising:

the circuit according to claim 1; and

a display portion,

wherein the display portion includes a first pixel group, a second pixel group, a first driver circuit, and a second driver circuit,

wherein the first video signal is input to the first pixel group via the first driver circuit, and

wherein the second video signal is input to the second pixel group via the second driver circuit.

4. The display system according to claim 3, wherein the display system is configured to individually control the first driver circuit and the second driver circuit.

5. The display system according to claim 3,

wherein the display portion further includes a sixth circuit and a seventh circuit,

wherein the sixth circuit is configured to control power supply to the first driver circuit in accordance with the second signal, and

wherein the seventh circuit is configured to control power supply to the second driver circuit in accordance with the third signal.

6. The display system according to claim 3,

wherein the first pixel group includes a first pixel,

wherein the second pixel group includes a second pixel,

wherein the first pixel includes a reflective liquid crystal element, and

wherein the second pixel includes a light-emitting element.

7. The display system according to claim 6,

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

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

8. A display module comprising:

the display system according to claim 3; and

at least one of an FPC and an IC.

9. An electronic device comprising:

the circuit according to claim 1,

wherein the electronic device is configured to display a predetermined video in accordance with the data input with a wireless signal.

10. A circuit comprising:

a first circuit;

a second circuit;

a third circuit;

a fourth circuit; and

a fifth circuit,

wherein the first circuit is configured to output a first signal corresponding to input data,

wherein the second circuit is configured to generate a first video signal in accordance with the data and the first signal,

wherein the third circuit is configured to generate a second video signal in accordance with the data and the first signal,

wherein the fourth circuit is configured to output a second signal corresponding to a result of comparison between the first video signal and a third video signal input to the fourth circuit before input of the first video signal to the fourth circuit,

wherein the fifth circuit is configured to output a third signal corresponding to a result of comparison between the second video signal and a fourth video signal input to the fifth circuit before input of the second video signal to the fifth circuit, and

wherein the first video signal and the second video signal are different kinds of video signals.

11. The circuit according to claim 10,

wherein the first video signal is a video signal for displaying a character, and

wherein the second video signal is a video signal for displaying a video other than a character.

12. A display system comprising:

the circuit according to claim 10; and

a display portion,

wherein the display portion includes a first pixel group, a second pixel group, a first driver circuit, and a second driver circuit,

wherein the first video signal is input to the first pixel group via the first driver circuit, and

wherein the second video signal is input to the second pixel group via the second driver circuit.

13. The display system according to claim 12, wherein the display system is configured to individually control the first driver circuit and the second driver circuit.

14. The display system according to claim 12,

wherein the display portion further includes a sixth circuit and a seventh circuit,

wherein the sixth circuit is configured to control power supply to the first driver circuit in accordance with the second signal, and

wherein the seventh circuit is configured to control power supply to the second driver circuit in accordance with the third signal.

15. The display system according to claim 12,

wherein the first pixel group includes a first pixel,

wherein the second pixel group includes a second pixel,

wherein the first pixel includes a reflective liquid crystal element, and

wherein the second pixel includes a light-emitting element.

16. The display system according to claim 15,

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

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

17. A display module comprising:

the display system according to claim 12; and

at least one of an FPC and an IC.

18. An electronic device comprising:

the circuit according to claim 10,

wherein the electronic device is configured to display a predetermined video in accordance with the data input with a wireless signal.