DISPLAY APPARATUS AND CONTROL METHOD THEREOF

• US 20130050240A1
• Filed: 08/16/2012
• Published: 02/28/2013
• Est. Priority Date: 08/23/2011
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Mizutome, Atsushi, Nakamura, Koki
• Granted Patent: US 9,135,866 B2
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A display apparatus, according to the present invention, that displays an image by causing a backlight to emit light at an emission brightness value in accordance with brightness of the image, the display apparatus comprises: an input unit that inputs an image signal; a division unit that divides one frame period into a plurality of sub-frame periods when one frame of the image signal includes a plurality of images having different brightness; and a display controlling unit that performs control of switching between the plurality of images for each sub-frame period and displaying the images.

Claims

1. A display apparatus that displays an image by causing a backlight to emit light at an emission brightness value in accordance with brightness of the image,

the display apparatus comprising:

an input unit that inputs an image signal;

a division unit that divides one frame period into a plurality of sub-frame periods when one frame of the image signal includes a plurality of images having different brightness; and

a display controlling unit that performs control of switching between the plurality of images for each sub-frame period and displaying the images.

2. The display apparatus according to claim 1, wherein the display controlling unit causes an entire area of a backlight to emit light at the emission brightness value in accordance with the brightness of the image to be displayed at the time of performing the control.

3. The display apparatus according to claim 1, wherein the display controlling unit causes only a partial backlight area including a display area of the image to emit light at the emission brightness value in accordance with the brightness of the image to be displayed at the time of performing the control.

4. The display apparatus according to claim 1, wherein the display controlling unit performs the control to display images having the same brightness during one sub-frame period when one frame of the image signal includes the images having the same brightness.

5. The display apparatus according to claim 1, wherein

the display apparatus displays the image by causing a backlight of an area including the display area of the image to emit light at the emission brightness value in accordance with the brightness of the image,

the division unit classifies a plurality of images into image groups in which the images are able to be displayed concurrently while light emissions of backlights do not influence each other, based on a distance between the images, when one frame of the image signal includes the plurality of images having different brightness, and divides one frame period into sub-frame periods of the number of image groups, and

in the control, the image groups are switched therebetween to be displayed for each sub-frame period.

6. The display apparatus according to claim 5, wherein the division unit sets all the images having the same brightness as the same image group when one frame of the image signal includes the images having the same brightness, and

when one frame of the image signal includes the images having the same brightness, and all images having first brightness and all images having second brightness different from the first brightness are able to be displayed concurrently while the light emissions of the backlights do not influence each other, the division unit sets the images as the same image group.

7. The display apparatus according to claim 5, wherein the division unit classifies the plurality of images into the image groups based on a difference in brightness between the images and a distance between the images.

8. The display apparatus according to claim 5, wherein the display controlling unit causes a backlight in an area larger than an area of the image to emit light at the emission brightness value in accordance with the brightness of the image to be displayed at the time of performing the control.

9. A control method of a display apparatus that displays an image by causing a backlight to emit light at an emission brightness value in accordance with brightness of the image,

the method comprising:

an input step of inputting an image signal;

a division step of dividing one frame period into a plurality of sub-frame periods when one frame of the image signal includes a plurality of images having different brightness; and

a display controlling step of performing a control of switching between the plurality of images for each sub-frame period and displaying the images.

10. The control method of a display apparatus according to claim 9, wherein in the display controlling step, an entire area of a backlight emits light at the emission brightness value in accordance with the brightness of the image to be displayed when the control is performed.

11. The control method of a display apparatus according to claim 9, wherein in the display controlling step, only a partial backlight area including a display area of the image emits light at the emission brightness value in accordance with the brightness of the image to be displayed when the control is performed.

12. The control method of a display apparatus according to claim 9, wherein the control is performed such that in the display controlling step, images having the same brightness are displayed during one sub-frame period when one frame of the image signal includes the images having the same brightness.

13. The control method of a display apparatus according to claim 9, wherein

the display apparatus displays the image by causing a backlight of an area including the display area of the image to emit light at the emission brightness value in accordance with the brightness of the image,

in the division step, a plurality of images are classified into image groups in which the images can be displayed concurrently while light emissions of backlights do not influence each other, based on a distance between the images, when one frame of the image signal includes the plurality of images having different brightnesses and one frame period is divided into sub-frame periods of the number of image groups, and

in the control, the image groups are switched therebetween to be displayed for each sub-frame period.

14. The control method of a display apparatus according to claim 13, wherein in the division step,

all the images having the same brightness are set as images in the same image group when one frame of the image signal includes the images having the same brightness, and

when one frame of the image signal includes the images having the same brightness, and all images having first brightness and all images having second brightness different from the first brightness are able to be displayed concurrently while the light emissions of the backlights do not influence each other, the images are set as images in the same image group.

15. The control method of a display apparatus according to claim 13, wherein in the division step, the plurality of images are classified into the image groups based on a difference in brightness between the images and a distance between the images.

16. The control method of a display apparatus according to claim 13, wherein in the display controlling step, a backlight in an area larger than an area of the image emits light at the emission brightness value in accordance with the brightness of the displayed image when the control is performed.