Contents of Post
- 1 What is Difference Between LCD and LED ? Display Comparison
- 1.1 Conclusion
What is Difference Between LCD and LED ? Display Comparison
LCD (Liquid Crystal Display) and LED (Light Emitting Diode) Displays are two major display technologies being widely used today. LED Displays are technological advancement of LCD displays. LED displays are the LCD displays with an LED backlight to power up the LCD panel. It means that LEDs are placed behind or around the LCD panel to enhance the luminosity and video definition of the monitor screen. Cold cathode lights are used as Backlight in LCD displays. In LED displays all the concepts are same except this Backlight feature, which is replaced by LEDs.
Liquid Crystal Display (LCD):-
Liquid-crystal-display televisions (LCD TV) are television that use technology based on liquid-crystal displays to show pictures. LCD TVs are thinner and lighter than cathode ray tube (Monitor,old TVs) of similar display size.The fluorescent lights in an LCD TVs are always behind the screen. LCDs allow displays to be much thinner than cathode ray tube (CRT) technology.
A LCD can be define as a smooth board with the electronic visuals display which work through the light that have the quality of liquid crystal. LCDs are super-thin shows that are utilized as a part of tablet phone and level board screens. Smaller LCDs can be utilized as a part of handheld TVs, PDAs, and compact computer game gadgets.
LCD monitor is a desktop monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images. LCD monitors have a small footprint; that is, they do not take up much desk space. LCD monitors are available in a variety of sizes, with the more common being 19, 20, 22, 24, 26, 27, and 30 inches — some are 45 or 65 inches. Most are widescreen, which are wider than they are tall. You measure a monitor the same way you measure a television, that is, diagonally from one corner to the other.
Mobile computers and mobile devices often have built-in LCD screens. Many are widescreen; some are touch screen. Notebook computer screens are available in a variety of sizes, with the more common being 14.1, 15.4, 17, and 20.1 inches. Netbook screens typically range in size from 8.9 inches to 12.1 inches, and Tablet PC screens range from 8.4 inches to 14.1 inches. Portable media players usually have screen sizes from 1.5 inches to 3.5 inches. On smart phones, screen sizes range from 2.5 inches to 4.1 inches. Digital camera screen sizes usually range from 2.5 inches to 4 inches. Read Innovative Computing 5-1 to find out about another use of LCD screens.
LCD Technology and Quality
A liquid crystal display (LCD) uses a liquid compound to present information on a display device. Computer LCDs typically contain fluorescent tubes that emit light waves toward the liquid-crystal cells, which are sandwiched between two sheets of material. The quality of an LCD monitor or LCD screen depends primarily on its resolution, response time, brightness, dot pitch, and contrast ratio
- Resolution is the number of horizontal and vertical pixels in a display device. For example, a monitor that has a 1440 3 900 resolution displays up to 1440 pixels per horizontal row and 900 pixels per vertical row, for a total of 1,296,000 pixels to create a screen image. A higher resolution uses a greater number of pixels and thus provides a smoother, sharper, and clearer image. As the resolution increases, however, some items on the screen appear smaller. With LCD monitors and screens, resolution generally is proportional to the size of the device. That is, the resolution increases for larger monitors and screens. For example, a widescreen 19-inch LCD monitor typically has a resolution of 1440 3 900, while a widescreen 22-inch LCD monitor has a resolution of 1680 3 1050. LCDs are geared for a specific resolution
- Response time of an LCD monitor or screen is the time in milliseconds (ms) that it takes to turn a pixel on or off. LCD monitors’ and screens’ response times range from 3 to 16 ms. The lower the number, the faster the response time.
- Brightness of an LCD monitor or LCD screen is measured in nits. A nit is a unit of visible light intensity. The higher the nits, the brighter the images.
- Dot pitch, sometimes called pixel pitch, is the distance in millimeters between pixels on a display device. Average dot pitch on LCD monitors and screens should be .30 mm or lower. The lower the number, the sharper the image.
- Contrast ratio describes the difference in light intensity between the brightest white and darkest black that can be displayed on an LCD monitor. Contrast ratios today range from 500:1 to 2000:1. Higher contrast ratios represent colors better.
Light Emitting Diode (LED):-
This is because an LED TV uses light-emitting diodes for back lighting as opposed to the CCFLs of conventional LCD TVs.While in LCD fluorescent lights in an LCD TVs are always behind the screen. The display of an LED TV is not an LED display, so a more technically correct name for it would be “LED-back light LCD television.
A LED is an electronic gadget that discharges light when an electrical current is gone through it. Early LEDs delivered just red light, however present day LEDs can create a few distinct colors, i.e. green, red, and blue (RGB) light. Latest advances in LED innovation have made it feasible for LEDs to create white light also.
LCD VS LED
There are some important differences which exist among LCD and LED are explained as follows:
The main difference between LCD and LED is of screen thickness. LED have thinner screen as compare to LCD.
LED TVs have excellent color quality as compare to LCD. LCD has very good color quality but best models can give the same quality as LED.
The expected life span of LED TVs is more than thirty years if usage is about for eight hours but it is twenty years for LCD if usage hours remain same.
While LED TVs are the modern technology so its price is quite high as compare to LCD. As LCD’s are available in smaller screens so its price is reasonable.
For LED’s viewing angles is very good and wider contrast to LCD’s. Comparatively viewing angles for LCD’s ranges from good to very good.
For LED’s the ratio of dynamic contrast can exceed from 1,000,000:1 whereas this ratio for LCD’s can be exceed 150,000:1.
For LED’s less power consumption is there and it is most efficient in consumption whereas LCD’s use more power and they are more efficient in usage of power.
LCD’s have more environmental impact on disposal as compare to LED’s which have lowest impact on environment when disposed.
LCD vs LED
Thickness 1 inch Minimum.
Power consumption Requires less power to control in comparison to plasma, however over OLED
Screen size 13″ to 57″
Burn-in Not a problem
Life span 50,000 to 100, 000 hours
Cost Much cheaper
Mechanism Backlight lined by a layer of liquid crystals
Thickness LED edge backlit LCD’s are diluent than CCFL LCD’s. typically but 1″.
Power consumption LED-lit LCD consume less power around seventieth compared to plasma .
Screen Up to 90″.
Burn-in is extremely rare
Life span Around one hundred,000 hours
Cost $100 (small size and extremely low end)
Mechanism light emitting diodes
From the above differences we can say that LED’s are modern technology and shows a better picture as compare to LCD’s.