Tower Crane. Also known as tower crane, referred to as tower crane, in construction machinery, generally refers to the body of the tower-type structure of the full rotary jib crane, for large-scale civil engineering construction site common means of transport, building materials, construction machinery handling, high and low, vertical and horizontal direction can also be crossed, the task of moving objects can be quickly completed. Tower Crane Self Erecting Tower Crane,Tower Crane,Top Kits Cranes,Topless Cranes Jinan Shanghangda Machinery Co., Ltd. , https://www.shdtowercrane.com
What is the difference in performance between CRT monitor and LED monitor? Will the CRT monitor be replaced by an LCD monitor?
Color monitors using cathode ray ray tubes (CRTs) and color monitors using liquid crystal displays (LCDs) are distinguished by the principle of image reproduction. The former uses magnetic deflection drives to implement line-field scanning (also called analog driving). Mode), while the latter uses a dot-matrix drive (also called a digital drive). Therefore, the former often uses television lines to define its sharpness, while the latter defines its resolution by the number of pixels. The clarity of a CRT monitor is mainly determined by the channel bandwidth of the monitor and the dot pitch and convergence error of the picture tube, while the latter is determined by the number of pixels of the LCD screen used. The CRT monitor has the advantages of low cost, high brightness, wide viewing angle and high service life, while the LCD monitor has the advantages of small size (flat plate shape), light weight, no flashing, and no radiation of the image, but the LCD monitor The main disadvantages are high manufacturing cost, narrow viewing angle (darkened image when viewed from the side, reversed color when viewed from the side), and short service life (usually the LCD screen brightness drops below 60% of normal brightness after 5000 hours of burning, but CRT's average life expectancy can reach more than 30,000 hours) and other shortcomings. It should be affirmed that price, perspective, and service life are the three bottlenecks that affect the popularity of LCD monitors. Of course, LCD is one of the most mature leading-edge products of flat panel display devices and has been increasingly concerned by manufacturers at home and abroad, and its technology is continuously improving. At present, the horizontal viewing angle of a new thin film product (TFT) process using in-plane switching technology can reach 160° and the vertical viewing angle can reach 140°; at the same time, the price of LCD screens will gradually increase with the product. And the gradual increase in production and gradually decline; LCD's life will also be with LCD backlight and liquid crystal material technology continues to improve. Therefore, there is no doubt that after several years (perhaps 5 or 10 years later), LCD monitors are likely to replace CRT monitors as the mainstream of the monitor market.