Vehicular Head-Up Display Using Holographic Element

A vehicular head-up display using a holographic element, disposed in a vehicle, comprising:

• an image forming unit disposed on a roof of the vehicle, the image forming unit employing a plurality of light sources;
• a reflection mirror disposed below a windshield in the front of the vehicle, the reflection mirror having a first reflection surface facing forward and upward with respect to the vehicle;
• and
• a holographic mirror disposed between the reflection mirror and the windshield, the holographic mirror having a second reflection surface facing backward with respect to the vehicle, the holographic mirror reflecting light rays of a specific wavelength band and allowing light rays of not the specific wavelength band to pass through;
• wherein light rays emitted by the image forming unit are projected onto the first reflection surface of the reflection mirror;
• light rays reflected from the first reflection surface of the reflection mirror are projected onto the second reflection surface of the holographic mirror;
• and the light rays of the specific wavelength band reflected from the second reflection surface of the holographic mirror are projected onto the windshield to form a virtual image in front of the windshield.