How do not turn off the display with proximity sensor in iOS

i want to intercept the proximity sensor without turn off the display.

i know by the documentation that i have only boolean var:

Using the Proximity Sensor:

 proximityMonitoringEnabled
 proximityState

this code

[UIDevice currentDevice].proximityMonitoringEnabled = YES;

intercept the face, but do not turn off the display. It's possible to turn on the display with the sensor covered?

Thanks all