DISPLAY DEVICE, BRIGHTNESS ADJUSTMENT DEVICE, BACKLIGHT DEVICE, METHOD OF ADJUSTING BRIGHTNESS, AND PROGRAM

• US 20110205442A1
• Filed: 12/09/2009
• Published: 08/25/2011
• Est. Priority Date: 12/11/2008
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Inoue, Yasuo, Mori, Hideto
• Granted Patent: US 8,836,635 B2
• Time in Patent Office: Days
• US Class Current: 348/673
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

Provided is a display device including a current-brightness table calculation unit (112) that calculates a table representing a relationship between an average brightness and a gain of a video signal, a flash control calculation unit (114) that revises the table in order to reduce a change amount of a gain of each frame in the table, a video-average brightness conversion block (106) that calculates an average brightness of a video signal input for each frame, a current-brightness control table (110) that calculates a gain of a video signal from a table based on the average brightness calculated by the video-average brightness conversion block, a video gain block (104) that adjusts a video signal using the gain calculated by the current-brightness control table, and a display panel (300) that includes a plurality of pixels that emit light in response to a video signal and display a video based on a video signal adjusted by the video signal adjustment unit.

Claims

1. A display device, comprising:

a table calculation unit that calculates a table representing a relationship between an average brightness and a gain of a video signal;

a table revision unit that revises the table in order to reduce a change amount of a gain of each frame in the table;

an average brightness calculation unit that calculates an average brightness of a video signal input for each frame;

a gain calculation unit that calculates a gain of a video signal from the table based on the average brightness calculated by the average brightness calculation unit;

a video signal adjustment unit that adjusts a video signal using the gain calculated by the gain calculation unit; and

a display panel that includes a plurality of pixels that emit light in response to a video signal and displays a video based on a video signal adjusted by the video signal adjustment unit.

2. The display device according to claim 1, wherein the table revision unit revises the table so that a change amount of a gain with respect to a change amount of an average brightness is equal to or less than a predetermined value.

3. A brightness adjustment device, comprising:

a table calculation unit that calculates a table representing a relationship between an average brightness and a gain of a video signal;

a table revision unit that revises the table in order to reduce a change amount of a gain of each frame in the table;

an average brightness calculation unit that calculates an average brightness of a video signal input for each frame;

a gain calculation unit that calculates a gain of a video signal from the table based on the average brightness calculated by the average brightness calculation unit; and

a video signal adjustment unit that adjusts a video signal using the gain calculated by the gain calculation unit.

4. The brightness adjustment device according to claim 3, wherein the table revision unit revises the table so that a change amount of a gain with respect to a change amount of an average brightness is equal to or less than a predetermined value.

5. A backlight device, comprising:

a table calculation unit that calculates a table representing a relationship between an average brightness and a gain of a video signal input to a surface light source;

a table revision unit that revises the table in order to reduce a change amount of a gain of each frame in the table;

an average brightness calculation unit that calculates an average brightness of a video signal input for each frame;

a gain calculation unit that calculates a gain of a video signal from the table based on the average brightness calculated by the average brightness calculation unit; and

a video signal adjustment unit that adjusts a video signal using the gain calculated by the gain calculation unit.

6. The backlight device according to claim 5, wherein the table revision unit revises the table so that a change amount of a gain with respect to a change amount of an average brightness is equal to or less than a predetermined value.

7. A method of adjusting a brightness, comprising the steps of:

calculating a table representing a relationship between an average brightness and a gain of a video signal;

revising the table in order to reduce a change amount of a gain of each frame in the table;

calculating an average brightness of a video signal input for each frame;

calculating a gain of a video signal from the table based on the calculated average brightness; and

adjusting a video signal using the gain calculated by the gain calculation unit.

8. A program causing a computer to execute the steps of:

calculating a table representing a relationship between an average brightness and a gain of a video signal;

calculating a table representing a relationship between an average brightness and a gain of a video signal based on various conditions acquired by the setting condition acquisition unit;

revising the table in order to reduce a change amount of a gain of each frame in the table;

calculating an average brightness of a video signal input for each frame;

calculating a gain of a video signal from the table based on the calculated average brightness; and

adjusting a video signal using the gain calculated by the gain calculation unit.