DRIVING METHOD OF STEREOSCOPIC IMAGE DISPLAY DEVICE

• US 20120127384A1
• Filed: 11/17/2011
• Published: 05/24/2012
• 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
• Granted Patent: US 9,792,844 B2
• Time in Patent Office: Days
• US Class Current: 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 comprises:

a pixel portion comprising a first region and a second region;

a first pixel in the first region;

a second pixel in the second region;

a first backlight unit overlapping with the first pixel; and

a second backlight unit overlapping with the second pixel,

the method comprising the steps of;

supplying a first hue signal to the first pixel during a first subframe period;

supplying light of a first hue to the first pixel by the first backlight unit in response to the first hue signal;

supplying a second hue signal to the second pixel during the first subframe period;

supplying light of a second hue to the second pixel by the second backlight unit in response to the second hue signal; and

turning off the first backlight unit and the second backlight unit during a second subframe period.

2. The method for driving a display device according to claim 1, wherein the first hue and the second hue are different from each other.

3. A method for driving a display device,

wherein the display device comprises:

a pixel portion comprising a first region and a second region;

a first pixel in the first region;

a second pixel in the second region;

a first backlight unit overlapping with the first pixel; and

a second backlight unit overlapping with the second pixel, and

wherein a right-eye image display period and a left-eye image display period each comprise a first subframe period and a second subframe period,

the method comprising the steps of;

supplying a first hue signal to the first pixel during the first subframe period;

supplying light of a first hue to the first pixel by the first backlight unit in response to the first hue signal;

supplying a second hue signal to the second pixel during the first subframe period;

supplying light of a second hue to the second pixel by the second backlight unit in response to the second hue signal;

turning off the first backlight unit and the second backlight unit during the second subframe period; and

providing the right-eye image display period and the left-eye image display period alternately.

4. The method for driving a display device according to claim 3, wherein the first hue and the second hue are different from each other.

5. A method for driving a display device,

wherein the display device comprises:

a pixel portion comprising a first region, a second region adjacent to the first region, and a third region adjacent to the second region;

a first pixel in the first region;

a second pixel in the second region;

a third pixel in the third region;

a first backlight unit overlapping with the first pixel;

a second backlight unit overlapping with the second pixel; and

a third backlight unit overlapping with the third pixel,

the method comprising the steps of;

during a first subframe period, supplying a first hue signal to the first pixel;

during the first subframe period, supplying light of a first hue to the first pixel by the first backlight unit in response to the first hue signal;

during the first subframe period, supplying a third hue signal to the second pixel;

during the first subframe period, supplying light of a third hue to the second pixel by the second backlight unit in response to the third hue signal;

during the first subframe period, supplying a second hue signal to the third pixel;

during the first subframe period, supplying light of a second hue to the third pixel by the third backlight unit in response to the second hue signal;

during a second subframe period, supplying the second hue signal to the first pixel;

during the second subframe period, supplying the light of the second hue to the first pixel by the first backlight unit in response to the second hue signal;

during the second subframe period, supplying the first hue signal to the second pixel;

during the second subframe period, supplying the light of the first hue to the second pixel by the second backlight unit in response to the first hue signal;

during the second subframe period, supplying the third hue signal to the third pixel;

during the second subframe period, supplying the light of the third hue to the third pixel by the third backlight unit in response to the third hue signal;

during a third subframe period, supplying the third hue signal to the first pixel,

during the third subframe period, supplying the light of the third hue to the first pixel by the first backlight unit in response to the third hue signal;

during the third subframe period, supplying the second hue signal to the second pixel;

during the third subframe period, supplying the light of the second hue to the second pixel by the second backlight unit in response to the second hue signal;

during the third subframe period, supplying the first hue signal to the third pixel;

during the third subframe period, supplying the light of the first hue to the third pixel by the third backlight unit in response to the first hue signal; and

during a fourth subframe period, turning off the first backlight unit, the second backlight unit and the third backlight unit.

6. The method for driving a display device, according to claim 5, wherein a hue signal held in a pixel included in the first region and adjacent to the second region during the first subframe period is the same as a hue signal held in the pixel during the fourth subframe period.

7. The method for driving a display device, according to claim 5, wherein a hue signal held in a pixel included in the second region and adjacent to the third region during the first subframe period is the same as a hue signal held in the pixel during the fourth subframe period.

8. The method for driving a display device, according to claim 5, wherein a hue signal held in a pixel included in the second region and adjacent to the first region during the fourth subframe period is the same as a hue signal held in the pixel during the first subframe period.

9. The method for driving a display device, according to claim 5, wherein a hue signal held in a pixel included in the third region and adjacent to the second region during the fourth subframe period is the same as a hue signal held in the pixel during the first subframe period.

10. The method for driving a display device according to claim 5, wherein the first hue, the second hue and the third hue are different from one another.

11. A method for driving a display device,

wherein the display device comprises:

a pixel portion comprising a first region, a second region adjacent to the first region, and a third region adjacent to the second region;

a first pixel in the first region;

a second pixel in the second region;

a third pixel in the third region;

a first backlight unit overlapping with the first pixel;

a second backlight unit overlapping with the second pixel; and

a third backlight unit overlapping with the third pixel, and

wherein a right-eye image display period and a left-eye image display period each comprise a first subframe period, a second subframe period, a third subframe period, and a fourth subframe period,

the method comprising the steps of;

during the first subframe period, supplying a first hue signal to the first pixel,

during the first subframe period, supplying light of a first hue to the first pixel by the first backlight unit in response to the first hue signal;

during the first subframe period, supplying a third hue signal to the second pixel;

during the first subframe period, supplying light of a third hue to the second pixel by the second backlight unit in response to the third hue signal;

during the first subframe period, supplying a second hue signal to the third pixel;

during the first subframe period, supplying light of a second hue to the third pixel by the third backlight unit in response to the second hue signal;

during the second subframe period, supplying the second hue signal to the first pixel;

during the second subframe period, supplying the light of the second hue to the first pixel by the first backlight unit in response to the second hue signal;

during the second subframe period, supplying the first hue signal to the second pixel;

during the second subframe period, supplying the light of the first hue to the second pixel by the second backlight unit in response to the first hue signal;

during the second subframe period, supplying the third hue signal to the third pixel;

during the second subframe period, supplying the light of the third hue to the third pixel by the third backlight unit in response to the third hue signal;

during the third subframe period, supplying the third hue signal to the first pixel;

during the third subframe period, supplying the light of the third hue to the first pixel by the first backlight unit in response to the third hue signal;

during the third subframe period, supplying the second hue signal to the second pixel;

during the third subframe period, supplying the light of the second hue to the second pixel by the second backlight unit in response to the second hue signal;

during the third subframe period, supplying the first hue signal to the third pixel;

during the third subframe period, supplying the light of the first hue to the third pixel by the third backlight unit in response to the first hue signal;

during the fourth subframe period, turning off the first backlight unit, the second backlight unit and the third backlight unit; and

providing the right-eye image display period and the left-eye image display period alternately.

12. The method for driving a display device, according to claim 11, wherein a hue signal held in a pixel included in the first region and adjacent to the second region during the first subframe period is the same as a hue signal held in the pixel during the fourth subframe period.

13. The method for driving a display device, according to claim 11, wherein a hue signal held in a pixel included in the second region and adjacent to the third region during the first subframe period is the same as a hue signal held in the pixel during the fourth subframe period.

14. The method for driving a display device, according to claim 11, wherein a hue signal held in a pixel included in the second region and adjacent to the first region during the fourth subframe period is the same as a hue signal held in the pixel during the first subframe period.

15. The method for driving a display device, according to claim 11, wherein a hue signal held in a pixel included in the third region and adjacent to the second region during the fourth subframe period is the same as a hue signal held in the pixel during the first subframe period.

16. The method for driving a display device according to claim 11, wherein the first hue, the second hue and the third hue are different from one another.