Organic electroluminescent display

• US 20050218799A1
• Filed: 03/29/2005
• Published: 10/06/2005
• Est. Priority Date: 03/31/2004
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Hamada, Yuji
• Granted Patent: US 7,304,426 B2
• Time in Patent Office: Days
• US Class Current: 313/506
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A light emitting layer produces light having peak intensities in a wavelength range of not less than 460 nm and not more than 510 nm and a wavelength range of not less than 550 nm and not more than 640 nm, respectively. Each of a red color filter layer, green color filter layer, and blue color filter layer has a transmittance of 50% or more in a prescribed wavelength range and a transmittance of 10% or less in a prescribed wavelength range. The ratio of an intensity value of the light emitted from the light emitting layer at a wavelength of 575 nm to an intensity value of the light emitted at a wavelength of 475 nm is not less than 0.4 and not more than 4.0.

Claims

1. An organic electroluminescent display comprising:

a light emitting layer that produces light having peak intensities in a wavelength range of not less than 460 nm and not more than 510 nm and a wavelength range of not less than 550 nm and not more than 640 nm, respectively; and

first, second, and third color filters that are disposed so as to transmit the light produced by said light emitting layer,

said first color filter having a transmittance of 50% or more in a wavelength range of not less than 580 nm and not more than 660 nm and a transmittance of 10% or less in a wavelength range of not less than 400 nm and not more than 550 nm, said second color filter having a transmittance of 50% or more in a wavelength range of not less than 480 nm and not more than 590 nm and a transmittance of 10% or less in a wavelength range of not less than 400 nm and not more than 460 nm and a wavelength range of not less than 620 nm and not more than 660 nm,

said third color filter having a transmittance of 50% or more in a wavelength range of not less than 430 nm and not more than 530 nm and a transmittance of 10% or less in a wavelength range of not less than 580 nm and not more than 700 nm.

2. The organic electroluminescent display according to claim 1, wherein

a ratio of an intensity value of the light emitted from said light emitting layer at a wavelength of 575 nm to an intensity value of the light emitted from said light emitting layer at a wavelength of 475 nm is not less than 0.4 and not more than 4.0.

3. The organic electroluminescent display according to claim 1, wherein

a ratio of a luminance value of the light passed through said third color filter to a luminance value of the light passed through said first color filter is not less than 0.37 and not more than 2.73.

4. The organic electroluminescent display according to claim 1, wherein

a ratio of a luminous efficiency of the light passed through said third color filter to a luminous efficiency of the light passed through said first color filter is not less than 0.37 and not more than 2.73.

5. The organic electroluminescent display according to claim 1, wherein

said light emitting layer includes a first light emitting layer that emits light with a peak intensity in a wavelength range of not less than 550 nm and not more than 640 nm and a second light emitting layer that emits light with a peak intensity in a wavelength range of not less than 460 nm and not more than 510 nm.