Display apparatus

• US 8,446,105 B2
• Filed: 05/11/2011
• Issued: 05/21/2013
• Est. Priority Date: 05/17/2010
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takata, Kenji
• Primary Examiner(s): Lee, Jae
• Assistant Examiner(s): WITHERS, GRANT S
• Application Number:
  US13/105,784
• Publication Number:
  US 20110278604A1
• Time in Patent Office: 741 Days
• Field of Search: 257/89, 257/E21.121, 345/77, 345/690, 315/294
• US Class Current: 315/294
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

A display apparatus displays a character or a graphic formed by a first light-emitting element group (first group) and a background of the character or the graphic formed by a second light-emitting element group (second group) on a display unit. The ratio of the electric current flowing through the light-emitting elements (elements) in the second group to the elements in the first group with respect to the elements of a same color as the elements whose electric current per unit light-emitting area is the largest among the elements of different colors when the display unit displays white, is closer to 1 than the ratio of the electric current flowing through each of the elements in the second group to the elements in the first group with respect to the elements of different colors from the elements whose electric current per unit light-emitting area is the largest when the display unit displays white.

Claims

1. A method of display on a display apparatus including a display unit in which a plurality of light-emitting elements emitting light corresponding to flowing current are arranged, the plurality of light-emitting elements including light-emitting elements of different colors each of which emits light at the maximum luminance to display white, wherein electric current densities per unit light-emitting area of the light-emitting elements of different colors to display white are mutually different, the method comprising:

providing electric current to a first light-emitting element group which includes the light-emitting elements of the different colors and forms a character or a graphic in a certain position in the display unit; and

providing electric current to a second light-emitting element group which includes the light-emitting elements of the different colors same as the first light-emitting element group and forms a background of the character or the graphic in a position surrounding the first light-emitting element group;

wherein, during providing of electric current to the first and second light-emitting groups to form the character or the graphic and the background, respectively, a ratio for the light-emitting elements of the color having the largest electric current density to display white is closer to 1 than a ratio for light-emitting elements of the other colors, with respect to the ratio of the electric current flowing through the light-emitting elements in the second light-emitting element group to the electric current flowing through the light-emitting elements in the first light-emitting element group.

2. The method according to claim 1, wherein

the light-emitting elements in the first light-emitting element group display white, and

the light-emitting elements in the second light-emitting element group display a color of the light-emitting elements having the largest electric current density.

3. The method according to claim 1, wherein,

the light-emitting elements of the first light-emitting element group display black, and

the light-emitting elements in the second light-emitting element group display a color of the light-emitting elements other than the light-emitting elements having the largest electric current density to display white.

4. The method according to claim 1, wherein an aperture ratio of the light-emitting elements of the color having the largest electric current density to display white is smaller than an aperture ratio of the light-emitting elements of the other colors.

5. The method according to claim 1, wherein the areas and aperture ratios of the light-emitting elements of different colors are equal to each other.