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.