Image display device and virtual image display apparatus

Patent metadata

Field	Value
Publication number	US-11675205-B2
Application number	US-202217683685-A
Country	US
Kind code	B2
Filing date	Mar 1, 2022
Priority date	Feb 28, 2019
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

An image display device according to the present disclosure includes a first self-luminous display element that self-emits an image of first color light, a second self-luminous display element that self-emits an image of second color light, a third self-luminous display element that self-emits an image of third color light, and a prism including a dichroic mirror that synthesizes images of three colors, the first, the second, and the third self-luminous display element are each configured to extract light from a side of a semireflective semitransmissive electrode included in the first, the second, and the third self-luminous display element, and at least one of sums of a thickness of a transparent electrode and a thickness of an optical adjustment layer differs from other in the first, the second, and the third self-luminous display element.

First claim

What is claimed is:

1. An image display device comprising:
a first self-luminous display element that emits an image of first color light, the first self-luminous display element including:
a first reflective layer,
a first semireflective semitransmissive electrode,
a first optical adjustment layer disposed between the first reflective layer and the first semireflective semitransmissive electrode,
a first transparent electrode disposed between the first optical adjustment layer and the first semireflective semitransmissive electrode, and
a first light-emitting layer disposed between the first transparent electrode and the first semireflective semitransmissive electrode;
a second self-luminous display element that emits an image of second color light, the second self-luminous display element including:
a second reflective layer,
a second semireflective semitransmissive electrode,
a second optical adjustment layer disposed between the second reflective layer and the second semireflective semitransmissive electrode,
a second transparent electrode disposed between the second optical adjustment layer and the second semireflective semitransmissive electrode, and
a second light-emitting layer disposed between the second transparent electrode and the second semireflective semitransmissive electrode;
a third self-luminous display element that emits an image of third color light, the third self-luminous display element including:
a third reflective layer,
a third semireflective semitransmissive electrode,
a third optical adjustment layer disposed between the third reflective layer and the third semireflective semitransmissive electrode,
a third transparent electrode disposed between the third optical adjustment layer and the third semireflective semitransmissive electrode, and
a third light-emitting layer disposed between the third transparent electrode and the third semireflective semitransmissive electrode; and
a prism including a dichroic mirror that synthesizes the first color light, the second color light, and the third color light, wherein
when a sum of a thickness of the first transparent electrode and a thickness of the first optical adjustment layer is a first lamination thickness, a sum of a thickness of the second transparent electrode and a thickness of the second optical adjustment layer is a second lamination thickness, and a sum of a thickness of the third transparent electrode and a thickness of the third optical adjustment layer is a third lamination thickness,
the first lamination thickness differs from at least one of the second lamination thickness and the third lamination thickness.

2. The image display device according to claim 1 , wherein each of the first optical adjustment layer, the second optical adjustment layer, and the third optical adjustment layer in the first self-luminous display element, the second self-luminous display element, and the third self-luminous display element, respectively, is constituted of a laminated body of two or more layers.

3. The image display device according to claim 1 , wherein the first self-luminous display element, the second self-luminous display element, and the third self-luminous display element are each an organic electroluminescent element.

4. The image display device according to claim 3 , wherein
the first self-luminous display element includes a first organic layer including the first light-emitting layer,
the second self-luminous display element includes a second organic layer including the second light-emitting layer, and
the third self-luminous display element includes a third organic layer including the third light-emitting layer, wherein
an error in thicknesses between the first organic layer, the second organic layer, and the third organic layer is ±20% or less.

5. The image display device according to claim 4 , wherein
the first lamination thickness is greater than the first organic layer, the second lamination thickness is greater than the second organic layer, and the third lamination thickness is greater than the third organic layer.

6. The image display device according to claim 1 , wherein the thickness of the first transparent electrode, the thickness of the second transparent electrode, and the thickness of the third transparent electrode are identical to each other.

7. The image display device according to claim 1 , wherein
the thickness of the first optical adjustment layer is greater than the thickness of the first transparent electrode,
the thickness of the second optical adjustment layer is greater than the thickness of the second transparent electrode, and
the thickness of the third optical adjustment layer is greater than the thickness of the third transparent electrode.

8. A virtual image display apparatus, comprising the image display device according to claim 1 .

Assignees

• Seiko Epson Corp

Inventors

• Yamamoto Hidetoshi
• Hamade Yuiga

Classifications

• G03B21/00

  Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) · CPC title

• H10K59/50

  OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title