以下为句子列表：
英文: The function of illumination optics for projection displays is to direct light source onto a small area of microdisplay within a limited incident solid angle, and therefore the collection efficiency is especially important compared to other illumination a
中文: 摘要投影显示之照明系统须将光能量集中照明于一小面积与小角度之内，相较于其他照明之应用，其集光效率之考量更为严苛，亦为发光二极体于投影显示照明应用中最主要之技术课题。
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