Image display device and virtual image display device

Patent metadata

Field	Value
Publication number	US-11327327-B2
Application number	US-202016802790-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Feb 28, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

An image display device according to the present disclosure includes a first self-light-emitting display element that emits light for an image of red light, a second self-light-emitting display element that emits light for an image of blue light, a third self-light-emitting display element that emits light for an image of green light, and a prism having a dichroic mirror that synthesizes images of three colors, in which the first self-light-emitting display element, the second self-light-emitting display element, and the third self-light-emitting display element have a first cathode, a second cathode, and a third cathode, respectively, and when a film thickness of the first cathode is referred to as TR, a film thickness of the second cathode is referred to as TB, and a film thickness of the third cathode is referred to as TG, a relationship TR<TG is satisfied.

First claim

What is claimed is:

1. An image display device, comprising:
a first self-light-emitting display element configured to self-emit light for an image of red light having a peak in a red region;
a second self-light-emitting display element configured to self-emit light for an image of blue light having a peak in a blue region;
a third self-light-emitting display element configured to self-emit light for an image of green light having a peak in a green region; and
a prism having a dichroic mirror configured to synthesize three colors that are the red light emitted from the first self-light-emitting display element, the blue light emitted from the second self-light-emitting display element, and the green light emitted from the third self-light-emitting display element, wherein
the first self-light-emitting display element, the second self-light-emitting display element, and the third self-light-emitting display element include a first cathode, a second cathode, and a third cathode, respectively, and TR<TG where a film thickness of the first cathode is TR, a film thickness of the second cathode is TB, and a film thickness of the third cathode is TG, and
a thickness of the first cathode and a thickness of the second cathode satisfy TR≤TB.

2. The image display device according to claim 1 , wherein a thickness of the second cathode and a thickness of the third satisfy TB≤TG.

3. The image display device according to claim 1 , wherein each of the first cathode, the second cathode, and the third cathode has a film thickness from 10 nm to 40 nm.

4. The image display device according to claim 1 , wherein each of the first cathode, the second cathode, and the third cathode is mainly composed of an MgAg alloy.

5. The image display device according to claim 4 , wherein a ratio of Mg and Ag (Mg:Ag) in the MgAg alloy is from 1:7 to 1:13.

6. The image display device according to claim 1 , wherein the third cathode has a film thickness from 25 nm to 40 nm.

7. The image display device according to claim 1 , wherein a BT.2020 coverage achieved by the red light, the blue light, and the green light is not less than 87.0%.

8. The image display device according to claim 1 , wherein each of the first self-light-emitting display element, the second self-light-emitting display element, and the third self-light-emitting display element is an organic electroluminescence element.

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

10. An image display device, comprising:
a first self-light-emitting display element configured to self-emit light for an image of red light having a peak in a red region;
a second self-light-emitting display element configured to self-emit light for an image of blue light having a peak in a blue region;
a third self-light-emitting display element configured to self-emit light for an image of green light having a peak in a green region; and
a prism having a dichroic mirror configured to synthesize three colors that are the red light emitted from the first self-light-emitting display element, the blue light emitted from the second self-light-emitting display element, and the green light emitted from the third self-light-emitting display element, wherein
the first self-light-emitting display element, the second self-light-emitting display element, and the third self-light-emitting display element include a first cathode, a second cathode, and a third cathode, respectively, and TR<TG where a film thickness of the first cathode is TR, a film thickness of the second cathode is TB, and a film thickness of the third cathode is TG,
each of the first cathode, the second cathode, and the third cathode is mainly composed of an MgAg alloy, and
a ratio of Mg and Ag (Mg:Ag) in the MgAg alloy is from 1:7 to 1:13.

11. An image display device, comprising:
a first self-light-emitting display element configured to self-emit light for an image of red light having a peak in a red region;
a second self-light-emitting display element configured to self-emit light for an image of blue light having a peak in a blue region;
a third self-light-emitting display element configured to self-emit light for an image of green light having a peak in a green region; and
a prism having a dichroic mirror configured to synthesize three colors that are the red light emitted from the first self-light-emitting display element, the blue light emitted from the second self-light-emitting display element, and the green light emitted from the third self-light-emitting display element, wherein
the first self-light-emitting display element, the second self-light-emitting display element, and the third self-light-emitting display element include a first cathode, a second cathode, and a third cathode, respectively, and TR<TG where a film thickness of the first cathode is TR, a film thickness of the second cathode is TB, and a film thickness of the third cathode is TG, and
a BT.2020 coverage achieved by the red light, the blue light, and the green light is not less than 87.0%.

Assignees

• Seiko Epson Corp

Inventors

• Hamade Yuiga
• Yamamoto Hidetoshi

Classifications

• H10K59/90

  Assemblies of multiple devices comprising at least one organic light-emitting element · CPC title

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• G02B27/141 Primary

  using dichroic mirrors · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G03B33/12

  using beam-splitting or beam-combining systems, e.g. dichroic mirrors · CPC title