DISPLAY DEVICE, CONTROL METHOD AND COMPUTER PROGRAM FOR DISPLAY DEVICE

• US 20080284767A1
• Filed: 05/15/2008
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Inoue, Yasuo, Mori, Hideto, Ito, Masahiro, Meguro, Takeya, Kikuchi, Ken, Shidara, Hidehiko, Osumi, Toyo
• Granted Patent: US 8,144,085 B2
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2340/0442 Handling or displaying different aspect ratios, or changing the aspect ratio
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• 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 3/3225 using an active matrix
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

A display device includes: a light emission amount detecting section which inputs video signals having linear property and detects an amount of light emission from the video signals; a light emitting time calculating section which calculates light emitting time of the light emitting elements based on the amount of light emission detected by the light emission amount detecting section; a light emitting time recording section which records the calculated light emitting time; a luminance acquiring section which, acquires luminance information of the light emitting elements using the light emitting time recorded in the light emitting time recording section; a coefficient calculating section which calculates coefficients by which the video signals are multiplied based on the luminance information acquired by the luminance acquiring section; and a coefficient multiplying section which multiplies the video signals by the coefficients calculated by the coefficient calculating section.

Claims

1. A display device which has a display section in which pixels which have light emitting elements for emitting light by themselves according to a current amount and pixel circuits for controlling an electric current applied to the light emitting elements according to video signals, scanning lines which supply selection signals for selecting the pixels for emitting light to the pixels in a predetermined scanning cycle, and data lines which supply the video signals to the pixels are arranged into a matrix pattern, the display device comprising:

a light emission amount detecting section which inputs video signals having linear property and detects an amount of light emission from the video signals;

a light emitting time calculating section which calculates light emitting time of the light emitting elements based on the amount of light emission detected by the light emission amount detecting section;

a light emitting time recording section which records the calculated light emitting time;

a luminance acquiring section which acquires luminance information of the light emitting elements using the light emitting time recorded in the light emitting time recording section;

a coefficient calculating section which calculates coefficients by which the video signals are multiplied based on the luminance information acquired by the luminance acquiring section; and

a coefficient multiplying section which multiplies the video signals by the coefficients calculated by the coefficient calculating section.

2. The display device according to claim 1, further comprising a linear converting section which converts video signals having gamma property into the video signals having linear property.

3. The display device according to claim 1, further comprising a gamma converting section which converts output signals having linear property in the coefficient multiplying section into signals having gamma property.

4. The display device according to claim 1, wherein the coefficient calculating section calculates coefficients for adjusting luminance of the other colors is adjusted to luminance of a color having the lowest luminance as a result of acquiring the luminance information in the luminance acquiring section.

5. The display device according to claim 1, wherein

the light emission amount detecting section detects the amount of light emission in a plurality of regions on the screen,

the signal level correcting section corrects the amount of light emission according to the region where luminance is the lowest.

6. The display device according to claim 5, wherein the light emission amount detecting section moves the plurality of regions on the screen up and down so as to detect the amount of light emission.

7. A control method for display device, the display device having a display section in which pixels which have light emitting elements for emitting light by themselves according to a current amount and pixel circuits for controlling an electric current applied to the light emitting elements according to video signals, scanning lines which supply selection signals for selecting the pixels for emitting light to the pixels in a predetermined scanning cycle, and data lines which supply the video signals to the pixels are arranged into a matrix pattern, the control method comprising the steps of:

inputting video signals having linear property and detecting an amount of light emission;

calculating light emitting time based on the amount of light emission detected at the light emission amount detecting step;

recording the calculated light emitting time;

acquiring luminance of the light emitting elements based on a relationship between the light emitting time recorded at the light emitting time recording step and the luminance of the light emitting elements;

calculating coefficients by which the video signals are multiplied based on the luminance information acquired at the luminance acquiring step; and

multiplying the video signals by the coefficients calculated at the coefficient calculating step.

8. A computer program which allows a computer to control a display device having a display section in which pixels which have light emitting elements for emitting light by themselves according to a current amount and pixel circuits for controlling an electric current applied to the light emitting elements according to video signals, scanning lines which supply selection signals for selecting the pixels for emitting light to the pixels in a predetermined scanning cycle, and data lines which supply the video signals to the pixels are arranged into a matrix pattern, the computer program comprising the steps of:

inputting video signals having linear property and detecting an amount of light emission;

calculating light emitting time based on the amount of light emission detected at the light emission amount detecting step;

recording the calculated light emitting time;

acquiring luminance of the light emitting elements based on a relationship between the light emitting time recorded at the light emitting time recording step and the luminance of the light emitting elements;

calculating coefficients by which the video signals are multiplied based on the luminance information acquired at the luminance acquiring step; and

multiplying the video signals by the coefficients calculated at the coefficient calculating step.