Grating-coupled light guide, display system, and method employing optical concentration

• Main Authors: FATTAL DAVID A, AIETA FRANCESCO, LI XUEJIAN
• Format: Patent
• Language: Chinese; English
• Published: 15.05.2020
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

A grating-coupled light guide concentrates light and diffractively redirects the concentrated light at a non-zero propagation angle as guided light having a predetermined spread angle. The grating-coupled light guide includes a light guide, an optical concentrator, and a grating coupler. The optical concentrator is configured to concentrate light from a light source as concentrated light and the grating coupler is configured to diffractively redirect the concentrated light into the light guide as the guided light. Characteristics of the optical concentrator and grating coupler are configured in combination to determine the non-zero propagation angle and predetermined spread angle. A grating-coupled display system further includes an array of light valves configured to modulate emitted light as a displayed image. 光栅耦合光导将光集中并以非零传播角将集中光衍射重定向，作为具有预定展开角的引导光。光栅耦合光导包括光导、光学集中器和光栅耦合器。光学集中器被配置为将来自光源的光集中为集中光，并且光栅耦合器被配置为将集中光衍射重定向到光导中，作为引导光。光学集中器和光栅耦合器的特性被组合配置以确定非零传播角和预定展开角。光栅耦合显示系统还包括光阀阵列，其被配置为调制发射光作为显示图像。