High-contrast DLP projection system

• Main Authors: WANG BAILIN, XU JIANWEN, WU RONGTAI, HOU YANLEI
• Format: Patent
• Language: Chinese; English
• Published: 17.01.2023
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

The invention relates to the technical field of laser projection, and provides a high-contrast DLP projection system. Comprising a laser light source, a relay system, a DMD, a TIR prism and a projection lens, the incident plane of the projection lens is plated with a filter film, or an optical filter is additionally arranged between the projection lens and the TIR prism. According to the invention, stray light can be prevented from projecting a picture through the projection lens, so that the contrast ratio of the DLP projector is improved, the light projection picture of the DLP in an On state is not influenced, and the total output white picture brightness is not changed; therefore, the method has a very good effect when being applied to the DLP projector. 本发明涉及激光投影的技术领域，提出一种高对比度DLP投影系统。包括激光光源、中继系统、DMD、TIR棱镜、投影镜头，在所述投影镜头的入射面镀滤光膜，或在所述投影镜头与TIR棱镜之间增设滤光片。本发明不仅可以避免杂散光经由投影镜头投射出画面进而改善DLP投影仪对比度，而且不会影响DLP在On state状态下的光线投射出画面，总输出白画面亮度不变；故此发明应用在DLP投影仪应具有相当不错效果。