Projectors are divided into DLP and LCD. What's the difference between them?
Author:Liu Min Time:2021-07-22 12:24 Browse(142)
The maintenance principle of three LCD panel projector is that the optical system passes the strong light through the spectroscope to form three RGB beams, which are respectively transmitted through the RGB three color LCD panel; After AD conversion, the signal source is modulated and added to the liquid crystal panel. By controlling the opening and closing of the liquid crystal unit, the on-off of the light path is controlled. Finally, RGB light converges in the prism and is projected on the screen by the projection lens to form a color image.
The maintenance principle of three LCD panel projector is that the optical system passes the strong light through the spectroscope to form three RGB beams, which are respectively transmitted through the RGB three color LCD panel; After AD conversion, the signal source is modulated and added to the liquid crystal panel. By controlling the opening and closing of the liquid crystal unit, the on-off of the light path is controlled, and the RGB light finally converges in the prism, DLP (Digital Lighting processing) is a patented technology of Ti (Texas Instruments).
projector based on DLP display technology first appeared in 1996.

Projectors are divided into DLP and LCD. What's the difference between them?

the core component of DLP projector is DMD chip (digital micromirror device)
Other components include xenon bulb, optical prism and projection lens.
its working principle is: the light beam passes through a high-speed rotating color wheel (color separation device).
a prism) to decompose into R, G and B primary colors, and then project into DMD chip.
there are many tiny lenses on DMD chip (if the resolution is 800) × 600.
there are 480000 small lenses on the DMD chip, each of which can be used in + 10 ° And - 10 ° After the signal is input, it acts on the DMD chip to control the opening and deflection of the lens.
the incident light is reflected by the DMD lens and projected onto the large screen.
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the two camps of LCD and DLP are in fierce competition.
whose products Better technology,At present, there is no clear answer, but it can be said for sure that DLP projectors have higher contrast and more compact optical system design, so they have advantages in volume and weight; However, the problem of fast aging of LCD panel can not be solved well.
the two technologies have their own characteristics and can not be separated.
the two technologies will coexist for quite a long time in the future, unless one side has a breakthrough in technology or market strategy, it is expected to break this balance,
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one of the inherent shortcomings of LCD technology is the brightness loss.
because the LCD board is covered with grids.
it will block the light transmission, especially at high resolution, and even 60% of the light will be lost, which seriously affects the brightness performance of LCD projector.
in order to solve this problem, Epson adopts microlens technology, A micro lens is placed behind each grid to compensate for the light loss, which significantly improves the light transmission efficiency, so that the brightness output can exceed 3000A NSI lumen.
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LCD is the abbreviation of liquid crystal display.
the structure of LCD is to place liquid crystal in two pieces of parallel glass, There are many vertical and horizontal wires between the two pieces of glass, which can control the direction of rod-shaped crystal molecules through power on or not, and refract the light to produce a picture.
his advantage is that the fuselage is ultra-thin.
the image is clear. DLP uses internal projection, and an optical machine is installed inside the fuselage. Through refraction, the image is directly projected on the screen in proportion, High brightness, high contrast, low power,The power of the LCD is about 350W, and the DLP is about 220W. When the LCD is used for more than one year, there will be light leakage, distortion and other phenomena. Now the life of the light source of DLP is more than 10000 hours, and there is no need to worry about any light leakage, distortion phenomenon, and its black dive deeper. In terms of service time, the LCD service life is up to three years. Once there is a problem, it cannot be repaired, and the whole machine must be replaced, The DLP has a service life of 2 years because it uses optical mechanical projection, but it can continue to use only by replacing the light bulb. Moreover, it can be upgraded like a computer, and the maintenance cost is very low. The disadvantage of DLP is that it can't compare with LCD because it has optical mechanical projection inside. The 50 inch DLP has a 31cm wide body and a 20cm LCD, The DLP of the same specification is much larger than the bottom of the LCD, and the larger the screen size is, the more obvious the price gap is. If you want to know anything else, please call me, Mr. Zhao 13653852615.
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