DISPLAY APPARATUS

• US 20120133575A1
• Filed: 11/14/2011
• Published: 05/31/2012
• Est. Priority Date: 11/30/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hasegawa, Toshinori
• Granted Patent: US 8,729,789 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

Provided is a display apparatus, which has both high light-emission efficiency and good display performance. The display apparatus includes multiple pixels, each of the multiple pixels including an organic light-emitting device including a first electrode, a light-emitting layer, and a second electrode, the multiple pixels including an optical unit for allowing a part of light emitted from the light-emitting layer to exit to outside while changing an exiting direction thereof, in which, in the multiple pixels including the optical unit, an optical distance between the light-emitting layer and the first electrode or an optical distance between the light-emitting layer and the second electrode is set to a predetermined value.

Claims

1. A display apparatus, comprising multiple pixels,

each of the multiple pixels comprising an organic light-emitting device comprising a first electrode, a light-emitting layer, and a second electrode,

the multiple pixels comprising an optical unit for allowing a part of light emitted from the organic light-emitting device to exit to outside while changing an exiting direction thereof,

wherein, in the multiple pixels, an optical distance L₁ between a light-emission position of the organic light-emitting device and the first electrode and an optical distance L₂ between the light-emission position and the second electrode satisfy Expressions below:

2L₁/λ

+φ

₁/2π

=1; and

L₂>

0, and 2L₂/λ

+φ

₂/2π

<

1,

where λ

is a maximum peak wavelength of a spectrum of light emitted from the organic light-emitting device, φ

₁ is a phase shift occurring when the light emitted at the light-emission position is reflected by the first electrode, and φ

₂ is a phase shift occurring when the light emitted at the light-emission position is reflected by the second electrode.

2. The display apparatus according to claim 1, wherein the optical unit extracts light entering the optical unit at an angle of 30 degrees or larger.

3. The display apparatus according to claim 1, wherein the optical unit comprises a lens having a light-condensing effect.