Projection LCD

Abstract

The projection LCD includes a light source, a color wheel, a polarized light beam separator, a first space light modulator, a second space light modulator and a projecting lens. The white light the light source emits is converted in the color wheel into color light, the color light is split in the polarized light beam separator into one first color light and one second color light in different polarization directions, and the first color light and the second color light leave from the polarized light beam separator in different direction. Then, the first color light and the second color light are modulated separately in the first space light modulator and the second space light modulator before being reflected back to the polarized light beam separator. The projecting lens is set in the light path of the modulated first color light and second color light after the polarized light beam separator to project the modulated first color light and second color light to form image.

Description

technical field [0001] The invention relates to a projection display device, and in particular to a liquid crystal projection display. Background technique [0002] With the development of video technology, liquid crystal display technology has gradually been widely used in daily life, such as LCD TV, notebook computer (Notebook) or desktop computer LCD screen (Liquid Crystal Display, LCD), and LCD projector etc. Among them, LCD projector is one of the important technologies for large-size screen display. The structure of the liquid crystal projector can be mainly divided into the lighting part, the color separation part and the imaging part. [0003] figure 1 is a schematic diagram of a known three-chip reflective liquid crystal projection system, and figure 2 It is a schematic diagram of a known single-chip reflective liquid crystal projection system. Such as figure 1 As shown, the three-chip reflective liquid crystal projection system 100 includes a light source 11...

AI Technical Summary

Problems solved by technology

Therefore, the light with a certain polarization direction passes through the polarizer 240, while the light with another polarization direction cannot pass through, but the utilization efficiency of the light is not high.

[0006] Based on the above, because the light splitting and combining process in the three-chip reflective LCD projection system is too complicated, it will lead to the loss of light and affect the brightness and other optical performances of the LCD projector.

In addition, the volume of the three-chip reflective liquid crystal projection system is too large, which is not conducive to the development trend of device miniaturization

In addition, in the single-chip reflective liquid crystal projection system, since only about half of the light can pass through the polarizer, the light utilization efficiency of the entire system is greatly reduced.

Images