Highly efficient and cost-effective display device is the LCD module. But what is a display device? It is essentially an output device that presents information visually. Such information can also be in tactile form. When the input information is in the form of electric signals the displays are called an electric display.
LCD modules are the most prolific and commonly used component in various applications. They drive visual displays in electric devices, consumer electronics as well as entertainment screens as in televisions and computer monitors. Here we explore the concept of LCD Modules, its benefits and another key electronic display component, the LED display.
LCD Module: What is it and
When a panel display uses liquid crystals as its primary functional medium then it is called an LCD Module. These are in contrast to Light emitting Diodes or LED displays that are larger and used in consumer electronics and organizational gadgets.
Exploring LED Display
As display units can be used indoors or outdoors a light emitting diode based display is usually made of environment surviving individual LED panels. These panels include a frame of cabinet that has a power supply and sending/receiving cards. These modules include the diodes, the drive in integrated circuits, and a PCB board.
Now let us look at how an LED works. The principle of an LED Display is called electro luminous. Whenever a current is passed through a diode the charge carriers and the holes in the semiconductor material recombine at the p-n junction. This recombination releases energy in the form of photon or electric lighting. The output results in images being found on the LED display.
How does an LCD Module Work?
When LCD modules were launched they rewrote the history of display devices. They simplified the structure of many output devices since LCDs are thinner than the traditional technology used at that time. Television sets were very bulky because of the use of cathode ray tube technology.
At the same time, LED displays that are the mainstay of such gadgets and devices, consumed considerable power in comparison to LCD technology. Today LCD with their less power consumption features and gas-based display are used extensively in a number of applications.
When you consider a display output device the main component is the millions of pixels that are formed on the display surface. Since the quality of the display will depend on the number of pixels as in the case of a 4K display made of 3840 X 2160 pixels the quality of these pixels becomes critical to the display technology.
Pixels are the primary color-causing components and are available in subpixels of red, blue and green. When the pixels change, color combinations are displayed. When all the pixels work together the images are displayed in the finest quality, even on very large screen sizes. When the pixels are rapidly switched on and off, the images are displayed.
Hence the control of the pixels is the heart of every display unit. Be it CRT LED or LCD the technology in controlling the pixels will improve the quality of the picture. Therefore in LCDs which are essentially backlit the pixels are switched electronically by using liquid crystals that polarize that rotate the polarized light. Additionally it includes a polarizing glass filter which is placed before and behind all the pixels. The front filter is usually at an angle of 90 degrees. Between both the filters are the liquid crystals that are electronically controlled to display the desired images and visual output.
The key factor in an LCD display is the process of blocking light rather than emitting light. In effect an LCD uses a back light principle to produce images on the display glass. Overtime LCDs are expected to replace much of the older and legacy display technology. One of today’s latest display technologies that is likely to have a larger user base is the OLED display technology. Besides, LED displays continues to evolve and offer wider lighting solutions for businesses and smartphones.