Hardware

                                                 Monitor

Cathode Ray Tube Monitor:

It is invented by Karl Ferdinand Braun. A beam of electrons strikes towards the CRT, and the collision of electrons with phosphorus produce light.(more about this topic and LED also).

Liquid Crystal Display Monitor (LCD):
It uses thin film transistor technology to display. The TFT is a part of the LCD. The main difference between LCD and TFT monitor is that the TFT monitor uses a tiny transistor for each pixel on the display. This allows the electrical current that illuminates the display to be turned on and off at a faster rate. Which makes the display brighter and shows motion smoother. These transistors are used in high-quality flat panel LCDs. The LCD monitor’s do not use this technology due to this LCD display could not keep up with fast moving images.

Characteristics of a Monitor:

Dot pitch is also called pixel pitch. It is the measurement that represents the diagonal distance between colored phosphorous dots on the display screen. The dot pitch for monitor in personal computer ranges from 0.15mm - 0.30mm. Refresh rate represents the number of times the image is displayed per second. The number is measured in Hz. Higher refresh rate less image flicker on the screen refresh rate less than the 60Hz produces an image flickering, meaning the image appears again and again.

Monitor Cable Technology:

1. Video Graphics Array (VGA):
VGA card represents the computer display standard introduced with the IBM in 1987. It is a video adapter, which is used for transferring the video signals in the monitor. A generic VGA has 15 pins and each pin (except of 3 spare pins) is defined for transferring a particular color signal. The display information is sent to the monitor in the analog form through a VGA. Nowadays VGA adapters not fully support the use of digital monitors, a new standard cable DVI has been designed.

2. Digital Video Interface (DVI):
DVI technology is based on transition minimized differential signaling (TMDS), which introduces a transmission method for sending digital information to a PC. It is developed by silicon image, which produces a high-speed digital-interface. TMDS receives signal from the resolution and refresh rate that the monitor uses, and spreads the signals out over the bandwidth to optimize the data transfer from the system (CPU) to monitor.