Optional and use experience of projectors, Projector Purchase and useing experience
Keywords: projector purchases and experience
Optional and use experience of projectors
First, buy parameters
1. The brightness of the brightness projector is usually expressed in light flux. The international general unit is ANSI lumen, which is one of the most important indicators of the projector. At present, the brightness of the projector can already be more than 1000 Gunsi Land, but the higher the brightness, the higher the cost, the more expensive price. At present, the brightness of the projector on the market is between 1500ambi ~ 3500 Ansi Liming, the photography in the ordinary classroom, the brightness is sufficient in 2000nsi ~ 2500ansi Limin (generally suitable for 100 inches or 120 "screens). For large conference halls and special multimedia classrooms and reporting halls (250M2 or more, the screen must match. 150 inches or even 200 inches), usually use 3000 Gunsi ~ 3500 Ansi lumen projectors.
2. The contrast contrast is critical to the impact of visual effects. In general, the larger the contrast of the projector, the more clear and eye-catching the image, the more colorful, the contrast is small, the entire picture will be gray. High contrast is helpful for the sharpness of the image, the details, and the grayscale characteristic performance. At present, most LCD projector products have nominal contrasts in 400: 1, while most DLP projectors have nominal contrasts at 1500: 1 or more. Of course, the higher the contrast, the higher the price, if only the projector is used to demise text and black and white pictures, 400: 1 contrast can be fully met; if used to demonstrate colorful photos and play video animations, it is best to choose 1000 : 1 high contrast projector.
3. The resolution of the resolution projector has a standard resolution and the highest resolution. The former refers to the original resolution of the projector (also called real resolution and physical resolution), the latter is just a compressed resolution, so We only care about the standard resolution. At present, the most of the projectors on the market are both SVGAs (resolutions 800x600) and XGA (1024x768), which are higher than the former. For conventional teaching, the projector for choosing SVGA resolution can meet the needs; XGA is primarily applied to a large conference hall or multimedia classroom for demonstrating a more fine image. ,
4. Bulb life bulbs are consumable materials with higher replacement costs in the projector. For schools, if you purchase the projector equipment in large quantities, you must consider the life of the bulb. Under normal circumstances, the brightness will gradually decay after using a period of time, and will eventually be used. The life of ordinary light bulbs should be around 2000 hours. The longest Test life of the current nominal life can reach 12,000 hours, even if the cumulative working time is 4,000 hours, the brightness does not have a significant attenuation.
. Second, use precautions
1. Strictly prevent the collision and vibration of vibration caused liquid wafer misalignment, which affects the convergence of three LCDs when the show, eventually leading to a failure of the RGB color. Vibration may also cause lens, reverse mirror deformation or damage in the optical system, affecting image projection effects. The zoom lens will damage the track under the impact, causing the lens to die, or even rupture.
2. Note that the dustproof and venting projector have a special fan for ventilation, but the high-speed airflow can be sandwiched with some micro-dust particles after the filter dust, and they can rub each other, and the electrostatic electricity can be adsorbed in the imaging and optical system, this is bound to The effect of affecting the projection screen. Therefore, in the use environment of the projector, dustproof work is very important, and the indoor must be strictly prohibited, it is best to have a vacuum cleaner for hygienic cleaning. And be sure to clean the dust network of the projector into the air.
3. Don't shut down the power out of the shutdown, you can't immediately turn off the power. Because the temperature in the rear machine is still very high, the heat dissipation system is still working, and immediately turn off the power will cause heat to cause damage, so the most It is easy to automatically stop after the machine is finished.
4. The projector lens often cleans if a variety of circles or spots appears on the screen, mostly the projection lens dirty, at which time the professional lens paper or other professional cleaners should be used to remove dust on the projector. In the dusty environment, it should be cleaned regularly after frequent use; in an unusually used time period, you must keep your lens cover. In the winter, it is best to remove the projector and put it in a dedicated projection package after cleaning. 5. For a long time, the use of other electronic devices is used for a long time, and the projector uses long to rest. For the DLP projector, the afternoon break time is available: And the LCD projector should rest more during class, and its heat resistance is less than DLP. Of course, the projector is opened, and the shutdown cannot be frequent, otherwise it is easy to cause damage to the projector bulb fracture or the internal electrical components.
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