Image display unit

Details Image display unit Image display unit

2007-10-23

2007-10-23

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Head up display

C359S014000, C359S015000, C359S630000, C359S631000, C345S007000, C345S009000

Reexamination Certificate

active

10512037

ABSTRACT:
The present invention relates to an image display device in which a virtual image of an image display element is formed to display an image. The image display device includes a transmission type diffraction optical element (50) for diffracting exit lights from the image display element (20) and a reflection type optical element (70) having a positive optical power for reflecting the diffracted lights from the transmission type diffraction optical element (50). When the reflected lights reflected by the reflection type optical element (70) are incident again on the transmission type diffraction optical element (50), the transmission type diffraction optical element (50) diffracts the reflected lights with a diffraction efficiency lower than a diffraction efficiency for the exit lights from the image display element (20).

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patent: 2001-311904 (2001-11-01), None
patent: 2002-98929 (2002-04-01), None

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