Illuminator for projection type display device

摘要: PROBLEM TO BE SOLVED: To obtain an illuminator capable of more improving the availability light, reducing power consumption and decreasing heat generation. SOLUTION: A light guide 14 has a incident plane 15 light- emitting surface 16 whose area is larger than that plane. An inside wall surrounding hollow formed between light-emitting forming reflecting property. source part 10 arranged on side 14, plural semiconductor bodies 12 are arrayed, so from condensed 15. Thus, utilization efficiency improved more, also reduction generation attained.