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Projector
LCD projector
Liquid crystal projectors (LCD) basically work like slide projectors. Instead of a slide, one or more transparent active matrix liquid crystal displays are used, controlled by thin film transistors. Devices commonly used today use three separate LCD matrices (3LCD technology) - one for each primary color - whose projection is combined to form an image via a specially arranged projection system with dichroic mirrors. This enables superimposed color composition (as opposed to side-by-side display on LCD monitors). Particularly high-quality devices use an optical unit with four separate LC matrices, whereby in addition to red, blue and green, another matrix is used specifically for the differentiated and bright representation of yellow. This allows you to combine high luminous efficacy with good color balance, something that is quite difficult for conventional devices with three LC matrices - their green display often has a slight yellow tint, the correction of which is usually associated with a fairly high loss of brightness.
LED projector
LED projectors use LEDs (Light Emitting Diodes) as the light source. A DLP element initially provided imaging. Newer video projectors also use LCD technology. Since the light output of light-emitting diodes is not particularly high, especially in the green between 540 and 610 nanometers wavelength,[4] there are hybrid products in which the green light is generated by a laser diode instead of a light-emitting diode.
Sources: Wikipedia
Examples of Projector
