Head-up display for automobile

Claim 1

A head-up display for an automobile comprising: a CCD camera for receiving information of conditions of a backward area of the automobile and for converting the information into an electric signal; a hologram optical projection system comprising a cathode ray tube (CRT) for converting the electric signal of the CCD camera into an image of the backward area conditions, a light source, a liquid crystal display (LCD) for partially transmitting and shielding the light emitted from the light source in accordance with the electric signal, a light transmission hologram optical device for converting a parallel beam from the LCD into a spherical wave, and a holder for maintaining an optical axis of the hologram optical projection system by holding the LCD and the light transmission hologram optical device; and a holographic combiner comprising a first hologram optical devise reproduced using a master hologram, a shock absorbing layer applied on an interference pattern of the first hologram optical device for protecting the interference pattern, and an adhesive layer applied on the shock absorbing layer, the holographic combiner being mounted on a windshield of the automobile and transmitting an image from a forward area of the automobile and reflecting the image projected by the hologram optical projection system.