High-efficient single stereoscopic projection system

Abstract

The invention provides a high-efficient single stereoscopic projection system. A polarizer is disposed in the front of a 2D (two-dimensional) projector to convert non-polarized light emitted by the projector into polarized P light or S light. A Fe-ion (ferrum-iron) contained liquid crystal panel is disposed between the polarizer and a metal curtain, due to the contained Fe iron in the liquid crystal panel, attenuation loss of light can be greatly avoided, brightness of the light can be improved, and accordingly P' light and S' light can be isolated effectively. A synchronous signal device is arranged on the Fe-ion contained liquid crystal panel to turn on and turn off the polarized light penetrating through the polarizer, the polarized light (P light or S light) in one direction is driven to rotate by +45 degrees and -45 degrees respectively by the turn-on and turn-off actions, then input mage electric signals of 3D video sources and different for the left eye and the right eye of a viewer can be converted into light signals only with the P' light and S' light for the left and the right eyes, and then the light signals are projected to the metal curtain to obtain projected polarized light only with the P' light and S' light, and finally viewers can watch videos in 3D effect via normal polaroid glasses.

Description

Technical field: [0001] The invention relates to an optical projection device, in particular to a projection system which can efficiently view stereoscopic images through a single projector and ordinary polarized glasses. Background technique: [0002] Now the imaging principle of the three-dimensional scene we see with human eyes is: when our two eyes see things independently, the left eye can only see the scene of the left eye, and the right eye can only see the scene of the right eye, because our two eyes There is a distance of about 6 to 7 centimeters between them. When the two eyes look at an object, the scenes seen by the two eyes are not the same. This will cause a slight displacement of the scenes seen by the two eyes, and what they see are two two-dimensional images. , after the synthesis of the brain, it finally presents a three-dimensional scene. [0003] In reality, whether we watch movies or TV, because the light is projected on the screen at the same time with...

AI Technical Summary

Problems solved by technology

[0004] After years of research on 3D technology, a variety of 3D projection display devices have been developed. At present, most of them use time-sharing and spectroscopic methods. The time-sharing method is mainly realized by wearing shutter glasses after imaging with an ordinary projection system. The two lenses of the shutter glasses are electronically controlled, and the light is quickly switched according to the output of the display, so that the eyes can see different pictures and feel the three-dimensional effect. Because the shutter glasses are of high value, they can only be realized in cinemas, so It does not use large-scale promotion, and the shutter-type glasses sensor is susceptible to external light interference, which affects the rapid switching of light, resulting in blurred and overlapping pictures; spectroscopic method: mainly uses two projectors to project images, and one projector The image signal of the left eye is projected, and the image signal of the right eye is projected by another projector. The projection light paths of the left and right eyes are adjusted respectively through the polarizers whose transmission axis directions are perpendicular to each other, so that the left and right projection images are repeatedly projected on the metal screen. The left and right eyes of the polarized glasses can only see the corresponding polarized light images, thereby generating a stereoscopic sensation in the visual nervous system to achieve the purpose of viewing stereoscopic images. Similar to the use of two projection devices, the hardware cost of the stereoscopic projection system is relatively high. At the same time, metal screens are required, which is difficult for ordinary families to install.

[0005] In order to overcome the deficiencies of the above technologies, in practice, we invented a projection system that uses mechanically driven polarized lenses to switch light and optical lenses to switch light, so that a single projector can wear polarized glasses to achieve stereoscopic images. The former is disclosed by the National Intellectual Property Bureau. "Image Playing System for Playing 3D Movies with a Single Projector" (Patent No.: 201010225962.9) as an example, the patent uses the servo unit in the 3D polarizer to drive the polarizing lens to switch, so that the left and right switching frequency of the polarizing lens can be switched with the two images Frequency synchronous, synchronously rotating polarizing lenses use optical polarization technology to completely separate the left and right screen images. When watching, wearing polarized glasses can make the two images appear alternately in the left and right eyes, resulting in stereoscopic vision. During optical imaging, the light is displayed at 120 frames per second. Frequency transmission, after polarization separation, the P light and S light are respectively transmitted to the left and right eyes at a frequency of 60 frames per second. Because the patent uses the servo unit in the 3D polarizer to mechanically drive the polarizing lens, frequency mismatch is prone to cause signal interference , so that the images seen by the left and right eyes are blurred; the latter takes "polarizing glasses, polarizing filter, projector, and stereoscopic image system" (patent number: 201120050306.X) disclosed by the State Intellectual Property Office as an example. The optical wave plate in it produces alternating image signal light according to the predetermined time, because the image alternates according to the frame sequence, so as to produce a stereoscopic feeling in the visual nervous system, so as to achieve the purpose of viewing stereoscopic images, similar patents use optical wave plate to realize the conversion of image signals , it will be interfered by the light caused by the image of the production process, and because the response speed of the ordinary liquid crystal panel is slow when the signal is switched, the response time (TI) of the left and right eye light signals is relatively long when the signal is switched, which is easy to produce left and right eye video In the interference area (P), the left and right eyes will also see blurred images (such as figure 1 shown)

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