Electronic devices with ambient-adaptive displays

A head-mounted device, comprising:

• an inner display operable in a passthrough display mode and a virtual reality display mode;
• a lens through which the inner display is visible from an eye box;
• an outer display that overlaps the inner display, wherein the outer display is configured to display first content when the inner display is operating in the passthrough display mode and second content when the inner display is operating in the virtual reality display mode, wherein the first content is different from the second content;
• and
• an ambient light sensor configured to measure a color of ambient light, wherein a white point of the outer display is adapted to the color of ambient light when the inner display is operating in the passthrough display mode and wherein the white point of the outer display is fixed at a default white point when the inner display is operating in the virtual reality display mode.