Display device and display method

• US 9,583,052 B2
• Filed: 09/03/2015
• Issued: 02/28/2017
• Est. Priority Date: 11/10/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Katsu, Yoshihiro, Nishi, Tomohiro, Ohta, Akihiro, Asano, Mitsuyasu
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US14/844,144
• Publication Number:
  US 20150379943A1
• Time in Patent Office: 544 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

Disclosed herein is a display device including: a liquid crystal display section adapted to display an image based on a video signal; a backlight; and a processing section adapted to correct the video signal and set the luminance of the backlight based on two pieces of information, a peak level of the video signal in a display screen or in each of a plurality of partial display areas into which the display screen is divided, and factor data obtained from a data map made up of a reference position on the display screen and the factor data that are associated with each other.

Claims

1. A display device comprising:

a liquid crystal display section to display an image based on a video signal on a display screen;

a backlight configured to have a plurality of light sources on one or more edge sides of the display screen; and

a light guide plate,

wherein each of the light sources is configured to emit light,

wherein the light emitted from each of the light sources is guided onto an entire surface of a respective partial light-emitting section of a plurality of partial light-emitting sections of the backlight by the light guide plate and emitted to the liquid crystal display section, so as to enable each of the partial light-emitting sections to emit light independently of each other; and

a processing section configured to correct the video signal and set luminance of the backlight based on (i) a peak level of the video signal in each of a plurality of partial display areas into which the display screen is divided, and (ii) factor data obtained from a data map made up of a reference position on the display screen and the factor data that are associated with each other, in which the partial light-emitting sections are associated respectively with the partial display areas,

wherein the peak level is a peak level of an image to be displayed in each of the partial display areas,

wherein the processing section is configured to obtain a respective peak level for each of the partial display areas by determining which unit area of respective plurality of unit areas into which each of the partial display areas is divided has a maximum value of the video signal, assigning the determined maximum value as the peak level of the partial display area and assigning the respective unit area having the maximum value as a respective reference position, and

wherein the processing section is configured to determine changes for the data map according to at least one of (i) an operation mode of a plurality of operation modes of the display device or (ii) content to be displayed.

2. The display device of claim 1,

wherein the processing section is configured to calculate a corrected peak level for each of the partial display areas by use of the respective peak value for said partial display area and respective factor data which is only associated with the respective reference position even when the respective unit areas of the respective partial display area have different values of factor data, such that the factor data associated with each position of a unit area which is a non-reference position is not utilized.

3. The display device of claim 2, wherein

the processing section is configured to set for each of the partial light-emitting sections a luminance level according to the corrected peak level of the partial display area corresponding to the partial light-emitting section.

4. The display device of claim 1 further comprising:

a data map generation section to generate the data map containing the factor data.

5. The display device of claim 1, wherein

the data map is divided into a plurality of factor data areas that differ in the factor data from each other.

6. The display device of claim 5, wherein

when the reference position belongs to a specific factor data area of the plurality of factor data areas, the processing section corrects the video signal so that the luminance of the backlight is set to a higher level and the transmittance of the liquid crystal display section is set to a lower level than when the reference position belongs to other factor data area.

7. The display device of claim 6, wherein

the specific factor data area is provided at and near the center of the display screen.

8. A display method comprising:

correcting a video signal and setting luminance of a backlight,

wherein the backlight is configured to have a plurality of light sources on one or more edge sides of a display screen,

wherein each of the light sources is configured to emit light,

wherein the light emitted from each of the light sources is guided onto an entire surface of a respective partial light-emitting section of a plurality of partial light-emitting sections of the backlight by a light guide plate and emitted to a liquid crystal display section for displaying an image based on the video signal on the display screen, so as to enable each of the partial lighting emitting sections to emit light independently of each other,

wherein the correcting the video signal and setting the luminance of the backlight is based on (i) a peak level of the video signal in each of the plurality of partial display areas into which the display screen is divided, and (ii) factor data obtained from a data map made up of a reference position on the display screen and the factor data that are associated with each other,

in which the partial light-emitting sections are associated respectively with the partial display areas,

wherein the peak level is a peak level of an image to be displayed in each of the partial display areas;

obtaining a respective peak level for each of the partial display areas by determining which unit area of respective plurality of unit areas into which each of the partial display areas is divided has a maximum value of the video signal, assigning the determined maximum value as the peak level of the partial display area and assigning the respective unit area having the maximum value as a respective reference position; and

determining changes for the data map according to at least one of (i) an operation mode of a plurality of operation modes of the display device or (ii) content to be displayed.