Since their introduction, projectors have evolved into three main families. LCD (Liquid Crystal Display), DLP (Digital Illumination Process) and CRT (Cathode Ray Tube) projectors.
The technology of LCD projectors is transmissive projection and is the most mature technology available. With the same wattage light source lamp, LCD projectors have a higher ANSI lumen light output than DLP projectors and currently dominate the market. It has the disadvantage that black level performance is not very good and contrast ratios generally hover around 500:1, allowing a clear view of the pixel structure of the projected image.
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The technology used in DLP projectors is reflective projection, which is a rapidly developing projection technology. Its use has resulted in a significant increase in the grey level of the projected image, a higher image signal-to-noise ratio, fine and stable picture quality and, especially when playing back moving video, a smooth image with no sense of pixel structure, a natural image and true and accurate digital image reproduction. Due to cost and body size considerations, most DLP projectors are currently designed with a single DMD chip, so they are slightly inferior to LCD projectors in terms of image colour reproduction, with less vibrant and vivid colours.
CRT projectors use a similar technology to CRT monitors and were the first projection technology. It has the advantage of a long life span, displaying images with rich colours, good reproduction and rich geometric distortion adjustment capabilities. Due to technical limitations, it was not possible to increase the lumens while increasing the resolution, which directly affected the brightness value of CRT projectors, which to date hovers below 300 lumens and has been eliminated due to its size and complexity of operation.