本文主要介绍背景照明光源的投射光学系统用的显示光源。
The article mainly presents the light sources of the backlighting and the display for projection optical systems.
一本杂志的主要目录或报纸的头版故事列表通常只能提供较少的背景介绍。
A magazine's main ToC or the list of a newspaper's front-page stories offers less context.
论文主要介绍了本课题的开发背景，所要完成的功能和开发的过程。
The paper introduces the development background of the subject, to complete the development and function of the process.
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