Display device and display method

Patent metadata

Field	Value
Publication number	US-9507557-B2
Application number	US-201314421189-A
Country	US
Kind code	B2
Filing date	Aug 21, 2013
Priority date	Sep 14, 2012
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

In first and second display devices ( 10, 20 ) both during pause drive (intermittent drive), an instantaneous increase in consumption power is suppressed by means of a configuration to perform control such that the scanning period in one of the two display panels is inserted during the scanning-stopped period in the other display panel, namely during the drive operation (for writing into the pixel circuit) of one of the two display panels, the drive operation (for writing) of the other display panel is not performed. Accordingly, even when a limit value of a current supply capability of a battery is low, the display device can be driven, so that a battery service life is prolonged and the operable time of a portable terminal ( 100 ) at the time of driving by the battery is increased.

First claim

The invention claimed is:

1. A display device capable of displaying an image on each of first and second screens, the device comprising:
a first display panel that includes a plurality of two-dimensionally arranged first pixel circuits;
a second display panel that includes a plurality of two-dimensionally arranged second pixel circuits; and
a drive control portion that performs driving:
to perform a first operation of writing a signal, including both a normal drive mode and a pause drive mode, which corresponds to first display data that displays an image on the first screen, into the plurality of first pixel circuits, and
to perform a second operation of writing a signal including both the normal drive mode and the pause drive mode, which corresponds to second display data that displays an image on the second screen, into the plurality of second pixel circuits, and to prevent the first and second operations from being simultaneously performed when both the first and second operations are performing the pause drive mode; wherein

the normal drive mode is defined by successive driving in which no pause periods are inserted; and
the pause drive mode is defined by intermittent driving in which at least one pause period is inserted.

2. The display device according to claim 1 , wherein
the drive control portion includes:
a first drive circuit that performs the first operation;
a second drive circuit that performs the second operation; and
a control portion that performs control so as to perform the first operation preferentially to the second operation when both the first and second operations are performing the pause drive mode, and to stop the second operation during the first operation.

3. The display device according to claim 2 , wherein the control portion determines whether the first and second operations are performing the normal drive mode or the pause drive mode based on the first and second display data, and controls the operations of the first and second drive circuits in accordance with a result of the determination.

4. The display device according to claim 3 , wherein
the control portion includes:
a first control circuit that determines whether the first operation is performing the normal drive mode or the pause drive mode based on the first display data, and outputs an inhibition signal during a period of the first operation when determining that the first operation performing the pause drive mode; and
a second control circuit that determines whether the second operation is performing the normal drive mode or the pause drive mode based on the second display data, and stops the second operation during an output period of the inhibition signal when determining that the second operation is performing the pause drive mode.

5. The display device according to claim 1 , wherein the drive control portion determines whether or not the first or second display data is moving image data, and successively performs a write operation on the corresponding first or second pixel circuit when determining that the first or second display data is moving image data.

6. The display device according to claim 1 , wherein at least one of the first and second pixel circuits is provided with a thin film transistor having a semiconductor layer made of an oxide semiconductor.

7. A display method for displaying an image on each of first and second screens, the method comprising:
controlling driving to:
perform a first operation of writing a signal, including both a normal drive mode and a pause drive mode, which corresponds to first display data that displays an image on the first screen, into a plurality of two-dimensionally arranged first pixel circuits included in a first display panel, and
perform a second operation of writing a signal, including both the normal drive mode and the pause drive mode, which corresponds to second display data for displaying an image on the second screen, into a plurality of two-dimensionally arranged second pixel circuits included in a second display panel, and to prevent the first and second operations from being simultaneously performed when both the first and second operations are performing the pause drive mode; wherein

the normal drive mode is defined by successive driving in which no pause periods are inserted; and
the pause drive mode is defined by intermittent driving in which at least one pause period is inserted.

Assignees

• Sharp Kk

Inventors

• Inada Ken
• Yamato Asahi

Classifications

• H04N13/144

  for flicker reduction · CPC title

• H04N13/31

  using parallax barriers · CPC title

• G09G3/003

  to produce spatial visual effects · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title