Vehicle display device including passage extending through optical member

A vehicle display device comprising:

• a display device configured to emit, as display light, a display image to be projected onto a projected member disposed outside a vehicle display device;
• at least one reflecting mirror disposed on an optical path of the display light from the display device to the projected member and configured to reflect the display light;
• an infrared sensor configured to detect external light that enters the display device through an opening allowing the outside and an internal space to communicate with each other and through the reflecting mirror;
• a temperature sensor configured to detect a temperature of the display device;
• and
• a controller configured to enable execution of a temperature lowering operation for lowering the temperature of the display device in accordance with a detection result of the infrared sensor and a detection result of the temperature sensor, wherein
• the display device includes:
• a light source;
• a light transmissive liquid crystal display element disposed on an optical path of light emitted from the light source;
• and
• a first optical member disposed between the liquid crystal display element and the light source and configured to change an optical path of light that enters from the light source and passes through the first optical member toward the liquid crystal display element,
• the infrared sensor is disposed on an optical path of external light incident on the display device at a side opposite to the liquid crystal display element across the first optical member,
• the first optical member includes a cutout portion provided on the end of the first optical member in a recessed shape on an optical path through which the external light passes, when the first optical member is viewed in the up-down direction,
• the first optical member includes:
• a transmissive area configured to transmit light applied to the transmissive area from the light source;
• and
• a non-transmissive area other than the transmissive area, and
• the non-transmissive area includes the cutout portion, and
• the controller enables execution of the temperature lowering operation when the infrared sensor detects the external light, and a detection value of the temperature sensor is equal to or higher than a threshold and restricts execution of the temperature lowering operation when the infrared sensor detects the external light, and the detection value of the temperature sensor is lower than a threshold.