Display device

• US 8,227,796 B2
• Filed: 11/11/2008
• Issued: 07/24/2012
• Est. Priority Date: 11/13/2007
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asaki, Reo, Yamada, Jiro
• Primary Examiner(s): Li, Meiya
• Application Number:
  US12/268,501
• Publication Number:
  US 20090121239A1
• Time in Patent Office: 1,351 Days
• Field of Search: 257/E33.069, 257/E51.012, 257/E51.022, 257/E51.018, 257/E51.026, 257/40, 257/79, 257/88, 257/98, 438/28, 438/29, 438/34, 438/35, 438/82, 438/99, 313/504, 313/506, 313/113, 359/302, 359/298, 359/299, 359/247, 359/248, 252/301.16
• US Class Current: 257/40
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

A display device includes light emitting elements corresponding to respective colors disposed on a substrate. Each of the light emitting elements corresponding to the respective colors has a cavity structure in which a light emission functioning layer including a light emitting layer is held between a reflecting electrode and a semitransmitting electrode. A cavity order of at least the light emitting element adapted to resonate a light, having the shortest wavelength, of the light emitting elements corresponding to the respective colors is 1, and a cavity order of each of other light emitting elements is 0. The light emission functioning layer except for the light emitting layer is common to the light emitting elements corresponding to the respective colors.

Claims

1. A display device comprising:

a substrate; and

a plurality of light emitting elements carried on the substrate, one of the light emitting elements emitting light having a wavelength shorter than those of other lights emitted by other of the light emitting elements,

wherein,

each of the light emitting elements has a cavity structure in which a light emission functioning layer is held between a reflecting electrode and a semitransmitting electrode, the light emission functioning layer including at least one of a respective transporting layer, a respective light emitting layer, a respective adjusting layer, a respective hole transporting layer, and a respective hole injecting layer,

a cavity order of at least the one light emitting element is configured to resonate its light and is 1, and

the light emission functioning layer, except for the respective light emitting layer or the respective light adjusting layer, is common to all of the light emitting elements.

2. The display device according to claim 1, wherein the plurality of light emitting elements comprising red, blue and green light emitting elements.

3. A display device comprising:

a substrate; and

at least first, second and third light emitting elements carried on the substrate, the first, second and third light emitting elements emitting lights having first, second and third wavelengths, respectively, the first wavelength being shorter than the second wavelength, the second wavelength being shorter than the third wavelength,

wherein,

each of the light emitting elements has a cavity structure in which a light emission functioning layer is held between a reflecting electrode and a semitransmitting electrode, the light emission functioning layer including at least one of a respective transporting layer, a respective light emitting layer, a respective adjusting layer, a respective hole transporting layer, and a respective hole injecting layer,

a cavity order of at least the first light emitting element is configured to resonate its light and is 1, and

the light emission functioning layer, except for the respective light emitting layer or the respective light adjusting layer, is common to all of the light emitting elements.

4. The display device of claim 3, wherein the cavity order of at least one of the second light emitting element and the third light emitting is 1.

5. The display device of claim 4, wherein the respective light adjusting layer is a common layer between the at least two of the first, second and third light emitting elements.