CRT MONITORS AND ACTIVE AND PASSIVE MATRIX DISPLAYS The texts “CRT Monitors” and “Active and Passive Matrix Displays” gives us the necessary basic knowledge about the types of monitors. Most desktop computer systems sold now by default come with LCD monitors. But if you are one of those who want to know the difference between CRT and LCD monitors, these texts are immense help. To start with, a CRT monitor in general is nothing more than cathode ray tube with millions of diminutive red, green and blue phosphor dots.
The working principle of CRT monitor is sustained by the theory of electron beam traveling across the tube to the area of deflection system where the beam is given direction to a specific pixel on the screen. The first CRT monitor has been invented in 1970s. However, monitor was greenish and the only possible sphere of usability was text-based computers. On the other hand, it was just a start. In 1987 when the VGA display system was invented and CRT monitors took a step into the astonishing success and recognition. As years went by, new technology of monitors was invented.
These were an active and passive matrix display technology using monitors. First of all, these monitors were different from CRT because of the new thin film transistor technology. It was that kind of technology where particular row was switched on and a charge was generated and sent down the column. As result, the pixel appeared on the monitor at the intersect place of the row and the column. Moreover, it was a revolution in making computers portable. To sum up, it is essential to mention that technologies are not staying fixedly so it is natural that one technique displaces other as time goes by. 285 words
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Difference between Active Matrix LCD and Passive Matrix LCD : 1. It uses thin film transistors that are arranged in a matrix on a glass surface. To control the voltage tiny switching transistors and capacitors are used at each pixel location.
Over the years, two different monitor display technologies have emerged in the computer industry, i.e., the cathode ray tube (CRT) and the liquid crystal display (LCD). CRT is a mature technology, while the LCD is a recent innovation [Table 1].
greatly reduced over that of an active TFT display. the more basic Indium Tin Oxide (ITO) conductive surface used on the passive LCD display. LCD charge in between row-addressing cycles. This main charge-holding difference allows the reduced response time, and better viewing angles.
While relatively simple and inexpensive to produce, passive-matrix displays do have a few drawbacks. Because the charge of the two conductors (rows and columns) is addressed only one row at a time, the response time of passive-matrix displays is relatively slow, and the contrast is greatly reduced over that of an active TFT display.
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