What is the main difference between dlp and lcd display technology?

- Sep 29, 2019-

The difference and characteristics of dlp and lcd (knowledge of projectors), the current mainstream projectors are mainly divided into dlp projectors and lcd projectors, and crt projectors have been eliminated, but most people do not know the two types of projectors, the characteristics of two projectors:1, dlp is the abbreviation of digital light sensors, translated as digital light processor. Dlp uses the digital microreflector of dmd as a light valve imaging device. The technology of dlp projector is reflective projection technology. With the application of the reflective dmd device, the dlp projector has the advantage of reflection, which is excellent in contrast and uniformity, high image clarity, uniform picture, sharp color, and the image noise is gone, the quality of the picture is stable, the accurate digital image can be reproduced continuously, and it is old and new. DLP projector can be divided into: single-chip computer, two-chip machine, three-chip machine. The dmd digital signal rotates in red, green and blue order, and the small mirror is turned on or off according to the pixel position and the number of colors. At this point, the dlp can be seen as a simple optical system with only one light source and a set of projection lenses, which magnify the reflected image of the dmd and project it directly on the screen. Because ordinary dlp projectors use a dmd chip, the most obvious advantage is the appearance of small, projector can be very compact. All mini projectors under 1.5 kg on the market are dlp type, most lcd projectors are more than 2.5 kg. Another advantage of dlp projectors is that the images are smooth and contrasting. These video advantages make it the first choice in the home theater world. With high contrast, most dlp projectors now have a contrast range of 600:1 to 800:1 and a low price range of 450:1. The lcd projector's contrast is only around 400:1, compared with 250:1 at a low price. The visual impact of the picture is strong, there is no pixel structure sense, the image is natural. The dlp projector also has the advantage of being less granular. at the resolution of the svga (800×600) format, the pixel structure of the dlp projector is weaker than that of the lcd. as long as the relative visual distance and the projected image picture size are adjusted properly, the pixel structure can no longer be seen. Long life, good picture quality stability: reflection technology makes dmd chip absorb less energy, and because of the use of semiconductor devices, high temperature resistance, long-term use of the picture will not appear obvious deterioration. Lcd (liquid crystal display) liquid crystal projector, can be divided into liquid crystal panel projector and liquid crystal valve projector, the former is the main product in the current projector market. Liquid crystal is a substance between liquid and solid, which does not emit light itself, and its working property is greatly affected by temperature, and its working temperature is -55°C ~77°C. The projector uses the photoelectric effect of liquid crystal, that is, the arrangement of liquid crystal molecules changes under the action of electric field, which affects the transmittance or reflectivity of its liquid crystal unit, thus affecting its optical properties and producing images with different gray levels and colors. because lcd projector color reduction is better, resolution up to sxga standard, small size, light weight, also very convenient to carry, is the mainstream product in the projector market. According to the number of liquid crystal board, lcd projector is divided into three-chip machine and single-chip computer. the light source in the lcd projector is a metal halogen lamp or uhp (cold light source), which emits bright white light. passing through the spectroscope in the optical path system, the white light is broken down into rgb (red, green, blue) three element color light, and the rgb three element color light passes through the liquid crystal in precise position. each liquid crystal acts like a light valve at this time, controlling whether the light in each liquid crystal passes through or not and how much light passes through. Three elements of the color of the light so, through the projector lens accurately projected on the screen, which point should be what color, light intensity of how much, are distributed. In this way, the projection on the screen constitutes a colorful image consistent with the source image. The ordinary lcd projector has many advantages, such as good color, good price and brightness uniformity. The obvious disadvantage of lcd projector is that the black level is too poor and the contrast is not very high. The lcd projector appears black, always looking gray, and the shadow is dim and detailed. This is very unsuitable for videos like movies, and is not very different for text to dlp projectors. The second drawback is that the lcd projector can see the pixel structure, and the viewer seems to be looking through the pane. The lcd projector in svga (800 x 600) format, regardless of the size of the screen image, can see the pixel lattice clearly, unless with a higher resolution product. at present, dlp projectors account for less than the market share of the main lcd projectors, but as a new projector product, compared with lcd projection technology in technology and application market, the biggest advantage of dlp projection is that it has the advantages of high resolution and high brightness, the image is sharper and sharper, the black and white are more pure, the gray level is more abundant, and it has the advantages of small size and light weight. The dlp projector is slightly more expensive, but slightly worse in color. summary: dlp projector brightness is higher, price is slightly expensive, lcd projector color is better, price is slightly lower. As for procurement, it still depends on their own needs.