As per Annex II, point 4, test set-up such as switching off the illumination of a display shall be duly noted in the technical documentation. If the display is switched off, the power consumption requirements for standby/reactivation function and/or off-mode are applicable.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.