All customers with an NRE savings account are eligible for the Display Debit Card. The eligibility to open an NRE account is given here.
NRIs residing abroad for studies or jobs, and PIO (Person of Indian origin)/OCI (Overseas Citizen of India) are eligible for this type of account.
Documents for Display Debit Card
The documents required to open an NRE account depend on whether the applicant is an an NRI (Non-resident Indian) or POI (Person of Indian origin). You can access the details
here. Common documents required are proofs of Indian and overseas address.