# Inactivity Measurement (/main-modules/display/inactivity)



A user's inactivity time is measured and stored with each `lv_display_t` object.
Every use of an [Input Device](/main-modules/indev) counts as activity. To get time elapsed since the last
activity, use <ApiLink name="lv_display_get_inactive_time" display="lv_display_get_inactive_time(display1)" />. If `NULL` is
passed, the lowest inactivity time among all displays will be returned.

You can manually trigger an activity using <ApiLink name="lv_display_trigger_activity" display="lv_display_trigger_activity(display1)" />.

<Callout type="info" title="Further Reading">
  * [lv\_port\_disp\_template.c](https://github.com/lvgl/lvgl/blob/master/examples/porting/lv_port_disp_template.c)
    for a template for your own driver.
  * [Drawing](/main-modules/draw) to learn more about how rendering works in LVGL.
</Callout>