I'm not sure what you mean by "real time" but if you do not have a copy of the user instructions follow the link http://support.tissot.ch/usersmanual/140-en.pdf and you will be able to download the instructions.
To activate lighting of the digital display, turn the crown to the left or right. Once the lighting has been activated, turn the crown to the right to increase the intensity, or to the left to reduce it.
The lighting remains active for 10 seconds after the last operation this link below is the manual
http://support.tissot.ch/usersmanual/140-en.pdf
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