A laser TV projection system

Abstract

An embodiment of the present invention provides a laser TV projection system, including: a projection light source module, a homogenization and polarization module, a phase photo, a PBS prism, a first LCOS light valve, a second LCOS light valve, and a projection lens; The light source module provides the first white light field; the homogenization and polarizing module polarizes the first white light field to obtain the second white light field; field and one of the third primary color light undergoes phase conversion to obtain the third white light field; the P polarized light in the third white light field is transmitted through the PBS prism and then reflected by the first LCOS light valve to obtain the first reflected light field and the The S-polarized light in the third white light field is reflected at the PBS prism and then reflected by the second LCOS light valve. The second reflected light field is transmitted to the projection lens after passing through the PBS prism, which avoids the three-piece light valve structure due to the The splitting and folding factor of the optical path leads to the situation of too many lens elements.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a laser TV projection system. Background technique [0002] The laser TV projection system is a device that controls the projection light source through the light valve to obtain the projection image, and uses the projection lens to enlarge the projection image and display it on the projection screen. It is widely used in our lives. At present, laser TV projection systems mostly use single-chip light valves or three-chip light valves. Single-chip light valves use one light valve to load RGB (Red Green Blue, Red Green Blue) The chip light valve refers to the use of three light valves to load RGB signals respectively. [0003] At present, in the application of single-chip light valves, monochromatic pure laser light sources are generally used to excite RGB or RGBY (Red Green Blue Yellow) fluorescent wheels. Due to the influence of time division, the display brightness is not...

AI Technical Summary

Problems solved by technology

[0003] At present, in the application of single-chip light valves, monochromatic pure laser light sources are generally used to excite RGB or RGBY (Red Green Blue Yellow) fluorescent wheels. Due to the influence of time division, the display brightness is not high and the picture quality is poor. Low defects, and limited by the expansion invariance of the light source and light valve, to increase the display brightness, it is necessary to increase the size of the light valve, resulting in a larger object plane of the UST (Ultra Short Throw, Ultra Short Throw) projection lens, the lens The larger the size, the larger the size of the entire system; and the use of three-color pure laser light source is limited by the price of green and red semiconductor laser diodes, the overall cost becomes high, and there is laser speckle effect

[0004] Although the three-piece light valve has the advantages of high brightness and high image quality, due to factors such as splitting and folding of the relay optical path, too many lens elements are used, which leads to the elongation of the back focus of the UST projection lens, and the same aperture conditions , the size of the UST projection lens becomes larger

[0005] A low-cost, miniaturized and high-brightness laser TV projection system has not yet appeared

Images