Optical modulation device and display device

Patent metadata

Field	Value
Publication number	US-12446428-B2
Application number	US-202318193619-A
Country	US
Kind code	B2
Filing date	Mar 30, 2023
Priority date	Mar 31, 2022
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

An optical modulation device includes a first electro-optical device including a first light-emitting element including a light-emitting layer emitting light including a red wavelength region, a second electro-optical device including a second light-emitting element including a light-emitting layer emitting light including a green wavelength region, a third electro-optical device including a third light-emitting element including a light-emitting layer emitting light including a blue wavelength region, and a prism that synthesizes light emitted from the first, second and third electro-optical devices. Each of the first, second and third light-emitting elements includes a first electrode, a second electrode, and a conductive layer provided therebetween and having a lower reflectance with respect to the light emitted from the light-emitting layer than from the first electrode. A thickness of the conductive layer of the third light-emitting element is thinner than thicknesses of the conductive layers of the first and second light-emitting elements.

First claim

What is claimed is:

1. An optical modulation device comprising:
a first electro-optical device including a first light-emitting element including a light-emitting layer emitting light including a red wavelength region;
a second electro-optical device including a second light-emitting element including a light-emitting layer emitting light including a green wavelength region;
a third electro-optical device including a third light-emitting element including a light-emitting layer emitting light including a blue wavelength region; and
a prism configured to synthesize light emitted from the first electro-optical device, the second electro-optical device, and the third electro-optical device, wherein
each of the first light-emitting element, the second light-emitting element and the third light-emitting element includes
a first electrode,
a second electrode, and
a conductive layer provided between the first electrode and the light-emitting layer, and having a lower reflectance with respect to the light emitted from the light-emitting layer than a reflectance of the first electrode, and

a thickness of the conductive layer of the third light-emitting element is thinner than a thickness of the conductive layer of the first light-emitting element and a thickness of the conductive layer of the second light-emitting element.

2. The optical modulation device according to claim 1 , wherein
the thickness of the conductive layer of the first light-emitting element is equal to or greater than the thickness of the conductive layer of the second light-emitting element, and
the thickness of the conductive layer of the second light-emitting element is thicker than the thickness of the conductive layer of the third light-emitting element.

3. The optical modulation device according to claim 1 , wherein
each of the first electro-optical device, the second electro-optical device, and the third electro-optical device includes an insulating layer between the first electrode and the light-emitting layer, and
the insulating layer is provided covering an end portion of the first electrode and an end portion of the conductive layer.

4. The optical modulation device according to claim 3 , wherein
areas of openings formed by the respective insulating layers of the first electro-optical device, the second electro-optical device, and the third electro-optical device are equal to each other.

5. The optical modulation device according to claim 1 , wherein
each of the first electro-optical device, the second electro-optical device, and the third electro-optical device includes an insulating layer between the first electrode and the light-emitting layer, and
in plan view, the insulating layer covers an end portion of the first electrode and is provided in a region different from the conductive layer.

6. The optical modulation device according to claim 5 , wherein
the light-emitting layer is provided between the conductive layer and the insulating layer.

7. The optical modulation device according to claim 1 , wherein
the thickness of the conductive layer of the first light-emitting element, the thickness of the conductive layer of the second light-emitting element, and the thickness of the conductive layer of the third light-emitting element are each from 0.5 nm to 20 nm.

8. The optical modulation device according to claim 1 , wherein
a material constituting each of the conductive layers contains at least one of Mo, Cr, Ni, or a nitride containing Ti.

9. A display device comprising:
the optical modulation device according to claim 1 ; and
an optical system configured to display light emitted from the optical modulation device.

Assignees

• Seiko Epson Corp

Inventors

• Hamade Yuiga

Classifications

• G02B2207/117

  Adjustment of the optical path length · CPC title

• H10K2102/351

  Thickness · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• H10K2102/302

  of OLED structures · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title