Question: the type of display that google glass presents to its users is called what
[{'answer': 'head - up display', 'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'start_paragraph_id': 6, 'start_character': 85, 'end_paragraph_id': 6, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}, {'answer': 'optical head - mounted display', 'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'start_paragraph_id': 1, 'start_character': 44, 'end_paragraph_id': 1, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '640 × 360 Himax HX7309 LCoS display'}, {'answer': 'Prism projector'}, {'answer': 'a liquid crystal on silicon ( LCoS ) ( based on an LCoS chip from Himax ) , field - sequential color system , LED illuminated display'}, {'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 758, 'bleu_score': 0.9567387793967381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15445966782561802256}, 'section': 'Section::::Features.\n'}]}, {'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 221, 'bleu_score': 0.80846720196545, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15445966782561802256}, 'section': 'Section::::Development.\n'}]}, {'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 367, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15445966782561802256}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Google Glass is a brand of smart glassesan optical head-mounted display designed in the shape of a pair of eyeglasses. It was developed by X (previously Google X) with the mission of producing a ubiquitous computer. Google Glass displayed information in a smartphone-like, hands-free format. Wearers communicated with the Internet via natural language voice commands.', 'Google Glass is a brand of smart glassesan optical head-mounted display designed in the shape of a pair of eyeglasses. It was developed by X (previously Google X) with the mission of producing a ubiquitous computer. Google Glass displayed information in a smartphone-like, hands-free format. Wearers communicated with the Internet via natural language voice commands.']}}]}, {'provenance': [{'wikipedia_id': '35326347', 'title': 'Google Glass', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 118, 'bleu_score': 0.7243342391544431}]}]