Since the advent of the projector, three major series have been developed so far: LCD (Liquid Crystal Display) LCD projectors, DLP (Digital Lighting Process) digital light processor projectors, and CRT (Cathode Ray Tube) cathode ray tube projectors.
The technology of LCD projectors is transmissive projection technology, which is currently the most mature. The color reproduction of the projection screen is vivid and vivid, the color saturation is high, and the light utilization efficiency is high. The LCD projector has higher ANSI lumen output than the DLP projector with the same wattage light source lamp. Currently, the projector with high lumen is mainly used in the market. Mainly LCD projectors. Its disadvantage is that the black level performance is not very good, the contrast is generally around 500:1, and the pixel structure of the projection screen can be clearly seen.
The technology of DLP projectors is reflective projection technology, which is now a high-speed projection technology. Its use, so that the projection image gray level, image signal noise ratio increased significantly, the picture quality is delicate and stable, especially in the playback of dynamic video images smooth, no sense of pixel structure, natural image, digital image restore true and accurate. Due to the cost and body size considerations, most DLP projectors currently use single-chip DMD chip designs, so the reduction in image color is inferior to that of LCD projectors, and the colors are not vibrant enough.
CRT projector technology is similar to CRT displays and is the earliest projection technology. Its advantages are long life, rich color display, good reproducibility, and rich geometric distortion adjustment capabilities. Due to the constraints of technology, it is impossible to increase the lumen while increasing the resolution and directly affect the brightness value of the CRT projector. So far, the brightness value of the CRT projector has been kept below 300 lumens. With the large volume and complicated operation, it has been eliminated.