{
  "$type": "site.standard.document",
  "description": "A light guide unit guides a display light toward a projection member. A multilayer film filter unit transmits the display light with an optical multilayer film and shields an external light incident from a projection window. In the XYZ color system, a first wavelength region is between a wavelength…",
  "path": "/patents/1235075",
  "publishedAt": "2019-05-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G02B27/0101",
    "DENSO CORPORATION"
  ],
  "textContent": "A light guide unit guides a display light toward a projection member. A multilayer film filter unit transmits the display light with an optical multilayer film and shields an external light incident from a projection window. In the XYZ color system, a first wavelength region is between a wavelength having a maximum value of a color matching function Z and a wavelength having a maximum value of a color matching function Y. A second wavelength region is between the wavelength having the maximum value of the color matching function Y and a wavelength having a maximum value of a color matching function X. A minimum transmittance of the multilayer film filter unit to the display light takes a minimum value among transmittances of respective wavelengths in a target wavelength region. The minimum transmittance in the first wavelength region is smaller than that in the second wavelength region.",
  "title": "HEAD-UP DISPLAY DEVICE"
}