Driving method of image display device in which the increase in luminance and the decrease in luminance compensate for each other

• US 9,792,844 B2
• Filed: 11/17/2011
• Issued: 10/17/2017
• Est. Priority Date: 11/23/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miyake, Hiroyuki, Inoue, Seiko
• Primary Examiner(s): LANDIS, LISA S
• Application Number:
  US13/298,341
• Publication Number:
  US 20120127384A1
• Time in Patent Office: 2,161 Days
• Field of Search: 345 7- 9, 345 87-104, 345690, 349 15
• CPC Class Codes: G09G 2310/0205 Simultaneous scanning of several lines in flat panels
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A display device capable of high-quality stereoscopic display without decreasing resolution is provided. A pixel portion including a plurality of pixels arranged in matrix is divided into plural regions, lighting of backlight units each emitting light of different hues is controlled in each region, and the backlight units of the plural regions are turned off simultaneously at a regular interval so as to display black. The right-eye image and the left-eye image are alternately displayed with black display interposed therebetween, and light incident on the right eye of a viewer is blocked when a left-eye image is displayed, and light incident on the left eye of the viewer is blocked when a right-eye image is displayed. An image signal is written into a pixel in a black display period during which the backlight units are turned off.

Claims

1. A method for driving a display device,

wherein the display device includes:

a pixel portion comprising;

a first region;

a second region adjacent to the first region;

a third region adjacent to the second region; and

a plurality of backlight units,

wherein each of the first region, the second region, and the third region comprises a plurality of pixels arranged in matrix,

the method comprising the steps of;

providing a right-eye image display period and a left-eye image display period alternately, wherein each of the right-eye image display period and the left-eye image display period includes a first subframe period, a second subframe period, a third subframe period, and a fourth subframe period;

during the first subframe period, supplying a first hue signal to each of the plurality of pixels of the first region;

during the first subframe period, supplying light of a first hue to each of the plurality of pixels of the first region by a first part of the plurality of the backlight units in response to the first hue signal;

during the first subframe period, supplying a third hue signal to each of the plurality of pixels of the second region;

during the first subframe period, supplying light of a third hue to each of the plurality of pixels of the second region by a second part of the plurality of the backlight units in response to the third hue signal;

during the first subframe period, supplying a second hue signal to each of the plurality of pixels of the third region;

during the first subframe period, supplying light of a second hue to each of the plurality of pixels of the second region by a third part of the plurality of the backlight units in response to the second hue signal;

during the second subframe period, supplying the second hue signal to each of the plurality of pixels of the first region;

during the second subframe period, supplying light of the second hue to each of the plurality of pixels of the first region by the first part of the plurality of the backlight units in response to the second hue signal;

during the second subframe period, supplying the first hue signal to each of the plurality of pixels of the second region;

during the second subframe period, supplying light of the first hue to each of the plurality of pixels of the second region by the second part of the plurality of the backlight units in response to the first hue signal;

during the second subframe period, supplying the third hue signal to each of the plurality of pixels of the third region;

during the second subframe period, supplying light of the third hue to each of the plurality of pixels of the third region by the third part of the plurality of the backlight units in response to the third hue signal;

during the third subframe period, supplying the third hue signal to each of the plurality of pixels of the first region;

during the third subframe period, supplying light of the third hue to each of the plurality of pixels of the first region by the first part of the plurality of the backlight units in response to the third hue signal;

during the third subframe period, supplying the second hue signal to each of the plurality of pixels of the second region;

during the third subframe period, supplying light of the second hue to each of the plurality of pixels of the second region by the second part of the plurality of the backlight units in response to the second hue signal;

during the third subframe period, supplying the first hue signal to each of the plurality of pixels of the third region;

during the third subframe period, supplying light of the first hue to each of the plurality of pixels of the third region by the third part of the plurality of the backlight units in response to the first hue signal; and

during the fourth subframe period, turning off the first part of the plurality of the backlight units, the second part of the plurality of the backlight units and the third part of the plurality of the backlight units,

wherein the plurality of pixels of the first region includes a first pixel that is adjacent to the second region,

wherein during the first subframe period, holding the third hue signal in the first pixel,

wherein the second subframe period is adjacent to the first subframe period,

wherein the third subframe period is adjacent to the second subframe period, and

wherein the fourth subframe period is adjacent to the third subframe period.

2. The method for driving a display device according to claim 1, wherein the first hue signal, the second hue signal, and the third hue signal are different from one another.

3. A method for driving a display device,

wherein the display device includes:

a pixel portion comprising;

a first region;

a second region adjacent to the first region;

a third region adjacent to the second region; and

a plurality of backlight units;

wherein each of the first region, the second region, and the third region comprises a plurality of pixels arranged in matrix,

the method comprising the steps of;

providing a right-eye image display period and a left-eye image display period alternately, wherein each of the right-eye image display period and the left-eye image display period includes a first subframe period, a second subframe period, a third subframe period, and a fourth subframe period;

during the first subframe period, supplying a first hue signal to each of the plurality of pixels of the first region;

during the first subframe period, supplying light of a first hue to each of the plurality of pixels of the first region by a first part of the plurality of the backlight units in response to the first hue signal;

during the first subframe period, supplying a third hue signal to each of the plurality of pixels of the second region;

during the first subframe period, supplying light of a third hue to each of the plurality of pixels of the second region by a second part of the plurality of the backlight units in response to the third hue signal;

during the first subframe period, supplying a second hue signal to each of the plurality of pixels of the third region;

during the first subframe period, supplying light of a second hue to each of the plurality of pixels of the second region by a third part of the plurality of the backlight units in response to the second hue signal;

during the second subframe period, supplying the second hue signal to each of the plurality of pixels of the first region;

during the second subframe period, supplying light of the second hue to each of the plurality of pixels of the first region by the first part of the plurality of the backlight units in response to the second hue signal;

during the second subframe period, supplying the first hue signal to each of the plurality of pixels of the second region;

during the second subframe period, supplying light of the first hue to each of the plurality of pixels of the second region by the second part of the plurality of the backlight units in response to the first hue signal;

during the second subframe period, supplying the third hue signal to each of the plurality of pixels of the third region;

during the second subframe period, supplying light of the third hue to each of the plurality of pixels of the third region by the third part of the plurality of the backlight units in response to the third hue signal;

during the third subframe period, supplying the third hue signal to each of the plurality of pixels of the first region;

during the third subframe period, supplying light of the third hue to each of the plurality of pixels of the first region by the first part of the plurality of the backlight units in response to the third hue signal;

during the third subframe period, supplying the second hue signal to each of the plurality of pixels of the second region;

during the third subframe period, supplying light of the second hue to each of the plurality of pixels of the second region by the second part of the plurality of the backlight units in response to the second hue signal;

during the third subframe period, supplying the first hue signal to each of the plurality of pixels of the third region;

during the third subframe period, supplying light of the first hue to each of the plurality of pixels of the third region by the third part of the plurality of the backlight units in response to the first hue signal; and

during the fourth subframe period, turning off the first part of the plurality of the backlight units, the second part of the plurality of the backlight units and the third part of the plurality of the backlight units,

wherein the plurality of pixels of the second region includes a first pixel that is adjacent to the third region,

wherein during the first subframe period, holding the third hue signal in the first pixel,

wherein the second subframe period is adjacent to the first subframe period,

wherein the third subframe period is adjacent to the second subframe period, and

wherein the fourth subframe period is adjacent to the third subframe period.

4. The method for driving a display device according to claim 3, wherein the first hue signal, the second hue signal, and the third hue signal are different from one another.