Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-9972260-B2
Application number	US-201615261255-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Mar 11, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A display device including a processor that includes a first display mode in which the processor displays the image on the display screen; and a second display mode in which the processor displays the image on the display screen from the image data received by the processor. The display device further includes a calculator that calculates a blanking period between a writing end time point of the internal image data corresponding to a final frame immediately before switching from the first display mode to the second display mode and a writing start time point of the image data corresponding to an initial frame immediately after switching from the first display mode to the second display mode, and an adjuster that adjusts at least one of a vertical retrace period, a horizontal retrace period, and a clock frequency, which correspond to the internal image data, depending on the blanking period.

First claim

What is claimed is:

1. A display device comprising:
a processor that performs processing on each frame of image data that includes plural frames, the display device displaying an image on a display screen based on the image data processed by the processor, wherein the processor receives the image data, a first control signal indicating a command to stop output of the image data, and a second control signal indicating a command to perform the output of the image data; and
a memory in which the image data received immediately before stop of transmission of the image data is stored as internal image data,
wherein the processor includes:
a first display mode in which the processor displays the image on the display screen from the internal image data after the processor receives the first control signal; and
a second display mode in which the processor displays the image on the display screen from the image data received by the processor after the processor receives the second control signal,
wherein the display device further comprises:
a calculator that calculates a blanking period between a writing end time point of the internal image data corresponding to a final frame immediately before switching from the first display mode to the second display mode and a writing start time point of the image data corresponding to an initial frame immediately after switching from the first display mode to the second display mode; and
an adjuster that adjusts at least one of a vertical retrace period, a horizontal retrace period, and a clock frequency, which correspond to the internal image data, depending on the blanking period.

2. The display device according to claim 1 , wherein the adjuster keeps a writing time duration corresponding to the internal image data constant, and adjusts the vertical retrace period corresponding to the internal image data.

3. The display device according to claim 1 , wherein the adjuster adjusts at least one of the vertical retrace period, the horizontal retrace period, and the clock frequency such that the vertical retrace period corresponding to the internal image data corresponding to the final frame is shorter than the blanking period.

4. A display device comprising:
a processor that performs processing on each frame of image data that includes plural frames, the display device displaying an image on a display screen based on the image data processed by the processor, wherein the processor receives the image data, a first control signal indicating a command to stop output of the image data, and a second control signal indicating a command to perform the output of the image data; and
a memory in which the image data received immediately before stop of transmission of the image data is stored as internal image data,
wherein the processor includes:
a first display mode in which the processor displays the image on the display screen from the internal image data after the processor receives the first control signal; and
a second display mode in which the processor displays the image on the display screen from the image data received by the processor after the processor receives the second control signal,
wherein the display device further includes:
a calculator that calculates a blanking period between a writing end time point of the internal image data corresponding to a final frame immediately before switching from the first display mode to the second display mode and a writing start time point of the image data corresponding to an initial frame immediately after switching from the first display mode to the second display mode; and
an interpolator that interpolates interpolation image data based on the internal image data in the blanking period when the blanking period is larger than a predetermined period.

5. The display device according to claim 4 , wherein the interpolator further adjusts at least one of the vertical retrace period, the horizontal retrace period, and the clock frequency, which correspond to the interpolation image data, depending on the blanking period.

6. The display device according to claim 5 , wherein the interpolator interpolates the interpolation image data when the blanking period becomes equal to or larger than a half of one frame period of the internal image data.

7. The display device according to claim 5 , wherein the interpolator adjusts at least one of the vertical retrace period, the horizontal retrace period, and the clock frequency such that the vertical retrace period corresponding to the internal image data corresponding to the final frame is shorter than the blanking period.

8. A method for driving a display device including a processor that performs processing on each frame of image data that includes plural frames, the display device displaying an image on a display screen based on the image data processed by the processor, said method comprising:
receiving, with the processor, the image data, a first control signal indicating a command to stop output of the image data, and a second control signal indicating a command to perform the output of the image data; and
storing as internal image data in a memory the image data received immediately before stop of transmission of the image data,
wherein the processor includes: a first display mode in which the processor displays the image on the display screen from the internal image data after the processor receives the first control signal; and a second display mode in which the processor displays the image on the display screen from the image data received by the processor after the processor receives the second control signal,
wherein the processor calculates a blanking period between a writing end time point of the internal image data corresponding to a final frame immediately before switching from the first display mode to the second display mode and a writing start time point of the image data corresponding to an initial frame immediately after switching from the first display mode to the second display mode, and
adjusts at least one of a vertical retrace period, a horizontal retrace period, and a clock frequency, which correspond to the internal image data, depending on the blanking period.

Assignees

• Panasonic Liquid Crystal Displ

Inventors

• Onishi Toshiki
• Ichiyama Iwane
• Inuzuka Tatsuhiro

Classifications

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2310/061

  for resetting or blanking · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title