Display system and head-up display

A head-up display comprising:

• a transmissive liquid crystal display panel;
• a scattering panel having a scattering area in which a scattering portion capable of being switched between scattering and transmission of light is provided;
• a temperature detector having a temperature detection area in which a temperature detection resistor element is provided;
• a light source configured to emit projection light to the liquid crystal display panel;
• and
• a controller configured to control operations of the scattering panel and the light source based on an output of the temperature detector corresponding to a temperature of the temperature detection resistor element, wherein
• a display area of the liquid crystal display panel, the scattering area, and the temperature detection area overlap one another,
• the projection light that has passed through the display area and the scattering area is projected onto a light-transmitting projection target to allow a virtual image to be viewed by a user, and
• when an output indicating that the temperature of the temperature detection resistor element is equal to or higher than a predetermined temperature is acquired, the controller causes the scattering portion to scatter light.