Awareness glasses, car mirror unit, and display apparatus configured to increase user awareness

A vehicular windshield apparatus, comprising:

• a plurality of light emitting diodes configured to generate light in response to a driving voltage, the plurality of light emitting diodes being adjacent to each other and disposed in front of a driver;
• a power source configured to supply the driving voltage to the plurality of light emitting diodes;
• a windshield forming a light guide, the light guide being configured to:
• receive the light from the plurality of light emitting diodes through a peripheral surface of the windshield;
• and
• guide, via total internal reflection, the light from the peripheral surface to a predetermined portion of the windshield disposed in front of the driver;
• and
• a diffraction grating pattern formed on a surface of the predetermined portion of the windshield, the diffraction grating pattern being configured to receive, diffract, and redirect the light from the plurality of light emitting diodes to eyes of the driver,
• wherein light output from the diffraction grating pattern has a peak wavelength between 444 nm and 484 nm,
• wherein the windshield comprises:
• a light output surface facing the driver;
• an opposite surface opposing the light output surface;
• and
• the peripheral surface extending between the light output surface and the opposite surface, and
• wherein the plurality of light emitting diodes are spaced apart from the windshield along the peripheral surface and disposed between the light output surface and the opposite surface.