Temperature detection device, display device, and head up display

A head up display comprising:

• a display panel configured to display an image;
• and
• a temperature detection device arranged so as to overlap with a display surface of the display panel, wherein
• the temperature detection device includes:
• a detection part in which a first resistor element and a second resistor element having different relations between temperature variation and variation in an electric resistance value are provided;
• a switch provided capable of performing a switching operation so as to be coupled to one of a first circuit including wiring to which the first resistor element is coupled and a second circuit including wiring to which the second resistor element is coupled;
• a power supply circuit configured to apply a voltage to the one circuit coupled to the power supply circuit through the switch to generate an electric signal in the one circuit;
• and
• a controller configured to detect a temperature of the detection part based on a strength of the electric signal output from the one circuit, and
• the controller is configured to periodically cause the switch to perform the switching operation.