Let the machine speak out!!
We all remember having studied display devices to be output devices back in school! This article is going to be about display devices. Display devices are used for the presentation of information in a visual and tactile form which let the machine speak for itself.
There are different types of display devices :
– CRT – Cathode ray tube display as the name suggests, uses a fluorescent blue tube in it and projects electrons to display the information. These projections are responsible for creating an image on the screen. The cons of this type of display is that with size of the screen, size of the cathode tube increases thereby increasing the weight of the display device. Another problem of using such devices is that the technology is ld-fashioned and outdated.
-LCD : LCD stands for Liquid crystal displays. These are the most common displays that are in use these days. There is a backlight that keeps the liquid crystal display on and the power is then off to transistor to depolarise which is how we see colours on our display screens.
16*2 LCD : This type of display is very basic in nature and its common usage lies in devices and circuits. A 16*2 display means that it has the capacity to display 16 characters/line and there are 2 lines all in all.
The 16*2 LCD Datasheet can be viewed on this link : http://www.engineersgarage.com/sites/default/files/LCD%2016×2.pdf
128*64 Graphics LCD : The 16*2 display devices have a major limitation of less space. 128*64 implies 128 characters /line and 64 lines in total which makes it 1024 pixels.
It is divided into two halves each one consists of 8 pages and controlled by seperate controllers.
Besides writing text, this serial graphic LCD allows the user to draw lines, circles and boxes, set or reset individual pixels, erase specific blocks of the display, control the backlight and adjust the baud rate.
This type of LCD priced ranges from Rs 800 to 1200 on the web.
– LED : It stands for light emitting diode. The LED technology has been embedded in many ways. One of the ways is to have the LEDs at the edge of screen. Inside the display, there is a component named diffuser which is responsible for the distribution of the light that comes through the whole back.
5*7 Dot Matrix Display :
Dot matrix displays are used in clocks, railways, buses notifications, and other devices that need a simple display device with limited resolution. It consists of mechanical indicators with the configuration in a rectangular (or other shapes) fashion.
Online electronic shopping being recommended by many engineers and other tech-savvy people, online shopping portals are also rising in number with many passing days. One can easily find suitable display devices online and help the machine speak itself!