Display with piezo material changing position of light source relative aperture layer

A method comprising:

• providing a first signal to a piezo material to alter a distance between a first light source of a display and a corresponding first aperture of an aperture layer of the display to a first position based on a first mode of the display;
• and
• providing a second signal to the piezo material to alter the distance between the first light source of the display and the corresponding first aperture of the aperture layer of the display to a second position based on a second mode of the display, wherein the first position is different from the second position.

A non-transitory machine-readable medium comprising a processing resource in communication with a display device, the processing resource having instructions executable to:

• provide a first signal to a first piezo material device of a piezo material layer to alter a distance between a first light source of the display device and a corresponding first aperture of an aperture layer of the display device to a first position based on a first mode designated to the first light source;
• and
• provide a second signal to the first piezo material device to alter the distance between the first light source of the display device and the corresponding first aperture of the aperture layer of the display device to a second position based on a second mode designated to the first light source, wherein the first position is different from the second position.