Patent ID: 7445035

Claim:
A process for initializing a device ( 1 ) comprising a screen ( 2 ) designed to move between two extreme positions, an actuator ( 3 ) capable of driving the screen at two different speeds, and a control unit ( 4 ) comprising a clock ( 6 ) that measures for how long the screen is in movement, a memory ( 5 ), and a logic processing unit ( 9 ) controlling the actuator, which process comprises at least the following steps: moving the screen in a first direction at fast speed for a fast speed first duration (T 1 ) such that the screen does not reach a first extreme position, moving the screen in the first direction at slow speed until it reaches the first extreme position, and record this duration as slow speed first duration (t 1 ), moving the screen in a second direction at fast speed for a fast speed second duration (T 2 ) such that the screen does not reach the second extreme position, moving the screen in the second direction at slow speed until it reaches the second extreme position and record this duration as slow speed second duration (t 2 ), moving the screen in the first direction at fast speed for the fast speed first duration (T 1 ), moving the screen in the first direction at slow speed until it reaches the first extreme position and record this duration as slow speed third duration (t 3 ), and calculating the times needed to cover the full travel at fast speed between the two extreme positions in the first direction and in the second direction using the first and second fast speed durations (T 1 , T 2 ) and the recorded slow speed first, second, and third durations (t 1 , t 2 , t 3 ), wherein the control unit ( 4 ) determines a screen position based on a duration of activation of the actuator.