【Principle of Stereoscopic Projection and Practical Projection Screen Technology】Business Projection Screen Technology Introduction

Stereoscopic projection is realized by the principle of light polarization, that is, two projectors are used to simultaneously project images, and the polarization directions of the polarizers in front of the two projectors are perpendicular to each other, so that the polarization directions of the two polarized lights generated are also perpendicular to each other. . When the polarized light is projected on a dedicated projection screen and then reflected to the audience's position, the direction of the polarized light must not change. The audience can only see the corresponding polarized image through the polarized glasses, thereby creating a three-dimensional sensation in the visual nervous system. Stereoscopic projection is divided into active stereoscopic projection and passive stereoscopic projection. However, due to the large technical defects of active stereoscopic projection itself, most of what we are exposed to is passive stereoscopic projection. Passive stereo projection puts high demands on the polarization of the screen. For the selection of the screen, we first excluded the white plastic screen and the glass bead screen. Because white plastic screens and glass bead screens do not have polarization, their light reflection principle is destined to be unable to meet the needs of passive stereo projection. In addition to the high requirements for the polarization of the screen, the stereoscopic projection also puts forward requirements for the gain of the screen. There is a serious light loss problem in the stereo projection process. Due to different technologies, the degree of light loss varies from 50% to 80%. That is to say, it is possible to use a 4000 lumens projector for stereo projection. The brightness that enters the human eye is only 800 lumens (Zscreen method). When it comes to high gain, many people naturally think of metal screens. Although the gain of the metal screen meets the needs of stereo projection, the metal screen itself has serious solar effects and metal glare problems, which will also seriously affect the display effect of the stereo projection and cannot achieve satisfactory results. Looking at the projection screen market, although there are many brands and types, there are few screens that can meet the needs of stereo projection, and there are very few professional stereo projection screens. At present, only two projection screen manufacturers, Aolong and Dali, have launched dedicated screens that meet the needs of stereo projection. The Aolong stereo projection screen is relatively brighter, and the product covers both hard and soft screens; while the powerful stereo projection screen has a slightly lower brightness and is dominated by soft screens. In contrast, the Aolong stereo projection screen The stereo projection effect is even better. Although the stereoscopic projection industry is a new industry, it has considerable market prospects. We also hope that more and more stereoscopic projection screens with more advanced technology will be launched on the market.