Display system

A display system comprising:

• a display panel that has a display area provided with a plurality of pixels arrayed in a first direction and a second direction intersecting the first direction and is configured to allow a user to visually recognize a background transmitted through the display area;
• a light source configured to emit light in the second direction toward a side surface of the display panel extending in the first direction;
• a signal processing circuit configured to
• generate input gradation values corresponding to the pixels based on an image to be displayed and
• output either first gradation values that are the input gradation values or second gradation values obtained by multiplying each of the input gradation values by an adjustment coefficient of 1 or smaller corresponding to attenuation of light propagating in the display panel;
• an illuminance sensor configured to measure environmental illuminance;
• and
• a camera configured to acquire a background image transmitted through the display panel, wherein
• the signal processing circuit is configured to output the first gradation values when average luminance of the background image is equal to or larger than a first predetermined value and illuminance acquired by the illuminance sensor is equal to or larger than a second predetermined value, and
• the signal processing circuit is configured to output the second gradation values when the average luminance of the background image is smaller than the first predetermined value and the illuminance is smaller than the second predetermined value.