# US 12,181,686 B2 · Optical display device and AR display device

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- Number: US 12,181,686 B2
- Document ID: US12181686B2
- Status: Granted
- Kind: B2
- Application number: 18/447,062
- Filed: 2023-08-09
- Published: 2024-10-24
- Granted: 2024-12-31
- Earliest claimed: 2023-04-24
- Assignees: Hangzhou Lingban Technology Co. Ltd.
- Applicants: Hangzhou Lingban Technology Co. Ltd.
- Inventors: Chaoqun Jiang; Pengbo Chen; Hui Du
- Web page: https://patentgrep.com/patent/US12181686B2

## CPC

- G02B 27/0972: {Prisms (prisms per se G02B5/04)}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B 27/01: Head-up displays
- G02B 27/0172: {characterised by optical features}
- G02B 27/0955: {Lenses (lenses per se G02B3/00)}
- G02B 27/288: {Filters employing polarising elements, e.g. Lyot or Solc filters (G02B5/3016 takes precedence)}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present invention relates to the field of optical devices, and discloses an optical display device and an AR display device. The optical display device includes an image source, a first dispersive prism, a second dispersive prism, and a first lens. The image source is disposed on a side of a first surface of the first dispersive prism, and the first lens is fitted closely with a second surface of the first dispersive prism. A first surface of the second dispersive prism is fitted closely with a third surface of the first dispersive prism. The first surface of the first dispersive prism is on a side close to eyes of a wearer. A first half-transparent half-reflective film is disposed on a surface on a side of the first lens away from the first dispersive prism.

## Claims

### Claim 1

An optical display device, comprising an image source, a first dispersive prism, a second dispersive prism, and a first lens, wherein
each of the first dispersive prism and the second dispersive prism is a dispersive prism with a refractive index of 1.45-1.75 and an Abbe number of 18.0-60.0;
a focal length f1 of the first lens satisfies 10 mm≤f1≤25 mm, a refractive index of the first lens is 1.45-1.90, an Abbe number of the first lens is 35.0-85.0, a curvature radius R11 of a first surface of the first lens satisfies R11≥100 mm or R11≤−100 mm, and a curvature radius R12 of a second surface of the first lens satisfies 40 mm≤R12≤80 mm, wherein the first surface of the first lens is a surface on a side close to the first dispersive prism, and the second surface of the first lens is a surface on a side away from the first dispersive prism; and
a gap between the first surface of the first lens and the second surface of the first dispersive prism is 0.01-1.0 mm;
and the image source is disposed on a side of a first surface of the first dispersive prism, and the first lens is fitted closely with a second surface of the first dispersive prism; a first surface of the second dispersive prism is fitted closely with a third surface of the first dispersive prism; both the first surface and the third surface of the first dispersive prism are located on a side of the second first dispersive prism close to eyes of a wearer, and the second surface of the first dispersive prism is located on a side of the second dispersive prism away from the eyes of the wearer;
and a first half-transparent half-reflective film is disposed on a surface on a side of the first lens away from the first dispersive prism;
an included angle a between the second surface and the third surface of the first dispersive prism satisfies 15°<a<35°, an included angle b between the first surface and a second surface of the second dispersive prism satisfies 15°<b<25°, a−b≤10°, and the second surface of the second dispersive prism is a surface on a side on which projected light originating from the image source is output; and
the projected light originating from the image source is incident into the first dispersive prism through the first surface of the first dispersive prism, is incident into the first lens after being sequentially reflected totally by the second surface of the first dispersive prism, reflected by the third surface of the first dispersive prism, and transmitted by the second surface of the first dispersive prism, and a part of the projected light originating from the image source is incident into the eyes after being reflected by the first half-transparent half-reflective film and sequentially transmitted and output by the second surface and the third surface of the first dispersive prism and the second dispersive prism.

### Claim 2 (depends on 1)

The optical display device according to claim 1, wherein a polarizing film is disposed on the third surface of the first dispersive prism, and a quarter-wave plate is disposed between the first lens and the polarizing film; or
a second half-transparent half-reflective film is disposed on the third surface of the first dispersive prism.

### Claim 3 (depends on 1)

The optical display device according to claim 1, wherein a second lens is further disposed between the image source and the first surface of the first dispersive prism.

### Claim 4 (depends on 3)

The optical display device according to claim 3, wherein a focal length f2 of the second lens satisfies f2≥50 mm or f2≤−50 mm, a refractive index of the second lens is 1.45-1.90, an Abbe number of the second lens is 35.0-85.0, and a curvature radius R21 of a first surface and a curvature radius R22 of a second surface of the second lens satisfy |R21−R22|>50 mm, wherein the first surface of the second lens is a surface on a side away from the first dispersive prism, and the second surface of the second lens is a surface on a side close to the first dispersive prism; and
a gap between the first surface of the second lens and the first surface of the first dispersive prism is 0.05-3.00 mm.

### Claim 5 (depends on 1)

The optical display device according to claim 1, wherein a third lens is further disposed on a side of the second surface of the second dispersive prism, and the second surface of the second dispersive prism is a surface on which projected light is transmitted and output from the second dispersive prism.

### Claim 6 (depends on 5)

The optical display device according to claim 5, wherein a focal length f3 of the third lens satisfies f3≥50 mm or f3≤−50 mm, a refractive index of the third lens is 1.45-1.90, an Abbe number of the third lens is 35.0-85.0, a curvature radius R31 of a first surface of the third lens satisfies R31≥100 mm or R31≤−100 mm, and a curvature radius R32 of a second surface of the third lens satisfies R32≥100 mm or R32≤−100 mm, wherein the first surface of the third lens is a surface on a side close to the second dispersive prism, and the second surface of the third lens is a surface on a side away from the second dispersive prism.