Question: when did led tv's first come out
[{'answer': '1977', 'provenance': [{'wikipedia_id': '18643118', 'title': 'LED display', 'start_paragraph_id': 13, 'start_character': 170, 'end_paragraph_id': 13, 'end_character': 174, 'bleu_score': 1.0, 'section': 'Section::::Development.:Early Prototypes.\n'}]}, {'provenance': [{'wikipedia_id': '18643118', 'title': 'LED display', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 483, 'bleu_score': 0.7345332266590351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9148889936318890817}, 'section': 'Section::::History.\n'}]}]