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The head mount type display device includes an optical system having a light emitting element, a display element illuminated by the light emitting element, and an image forming element 20 for producing an image. The display element is arranged between the image forming element and the first focal po

The head mount type display device includes an optical system having a light emitting element, a display element illuminated by the light emitting element, and an image forming element 20 for producing an image. The display element is arranged between the image forming element and the first focal point of the image forming element at a position nearer to the first focal point of the image forming element. A virtual image of the display element is formed by the image forming element 20 and the light emitted by the light emitting element is focussed on a second focal point of the image forming element. It is designed such that the eye of an observer is located on the second focal point when use. In another form, the optical system includes first and second elliptical concave mirrors with respective ones of focal points arranged at a common position.

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1. A display device arranged in front of an eye of an observer, comprising: a light emitting element; a display element illuminated by said light emitting element; and an image forming element allowing light passing through said display element to pass therethrough; wherein said display elemen

1. A display device arranged in front of an eye of an observer, comprising: a light emitting element; a display element illuminated by said light emitting element; and an image forming element allowing light passing through said display element to pass therethrough; wherein said display element is arranged between said image forming element and a first focal point of said image forming element at a position near to said first focal point of said image forming element, said image forming element both transmitting and reflecting light, and forming a virtual image of said display element, and said light emitting element having its emitted light focused by said image forming element at a second focal point of said image forming element. 2. A display device according to claim 1, further comprising an optical element arranged between said light emitting element and said display element for converting the light incident to said display element into a parallel light. 3. A display device according to claim 2, wherein the display element is a transmission type display element, the optical element is arranged on one side of the display element, and the image forming element is arranged on the other side of the display element. 4. A display device according to claim 2, wherein the display clement is a reflection type display element, and the optical element and the image forming element are formed by a common element.