What are the advantages and disadvantages of LCDs ?
The liquid crystal display ( LCD ) is a flat panel display , electronic visual display , or video display that uses the light modulating properties of liquid crystals which do not emit the light directly , LCDs are used in the computer monitors , televisions , the instrument panels , the aircraft cockpit displays and the signage .
LCDs are available to display the arbitrary images such as in a general purpose computer display or the fixed images which can be displayed or hidden such as preset words , digits , and 7-segment displays as in a digital clock , They use the same basic technology except that the arbitrary images are made up of a large number of small pixels while other displays have larger elements .
LCDs are used in DVD players , the gaming devices , the clocks , the watches , the calculators , and the telephones , They have replaced the cathode ray tube ( CRT ) displays in most applications , They are available in a wider range of screen sizes than CRT and plasma displays , and they do not use phosphors , they do not suffer image burn-in , LCDs are susceptible to image persistence .
Advantages of LCDs
LCD’s have no radiation emission from the screen , They are better under brighter conditions because of anti-glare technology , And LCD TVs are not affected by the increase or decrease in the air pressure .
LCD’s are lighter in weight with respect to the screen size , They can be used as a computer monitor , The images appear with greater resolution , And the colors of images look more realistic , They save the electricity bills because of lower power consumption , They consume less than 1/3 the power of a comparable CRT, They consume less electricity than a CRT and produce little heat .
LCD’s have better performance than Plasmas for smaller screen sizes , they require less power and generate less heat , They have satisfactory performance even when mounted at higher altitudes , They have longer life span , LCDs take up about 40% less desk space , They are thin and compact .
The brightness range of LCD‘s is wider , They produce very bright images due to high peak intensity , Very suitable for environments that are brightly lit , And they produce lower electric , magnetic and electromagnetic fields than CRTs .
The image is perfectly sharp at the native resolution of the panel , LCDs using an analog input require careful adjustment of pixel phase , And high peak intensity produces very bright images , Best for brightly lit environments .
There is zero geometric distortion at the native resolution of the panel , There is minor distortion for other resolutions because the images must be rescaled , And the screens are perfectly flat , And they have superior resolution , And they have sharp resolution and imagery .
LCDs are easy disposal , They have excellent contrast , They are immune to screen image burn-in , The screens are available in a vast range of sizes , And they are used in the battery powered electronics , And they have low flicker rates .
Disadvantages of LCDs
LCDs are more expensive compared to Plasma TV of the same size , They have less picture quality when viewed on the side or at an angle , And there is motion delay for the fast moving images .
The interference may require frequent readjustments throughout the day due to timing drift and jitter , Analog input requires careful modification of pixel phase to decrease or eliminate the digital noise in the image .
The aspect ratio and resolution are fixed , LCDs are not proficient at producing black and very dark grays , In a “standard” configuration , They are not appropriate for use in dimly lit and dark conditions .
The contrast adjustment is narrower in range than CRTs due to a poor black level , The response time is longer , Color saturation is reduced at low intensity levels due to a poor black level , The images are satisfactory but they are not accurate due to problems with black level , gray scale and Gamma .
LCD have white saturation , The saturation and compression can occur due to the bright end of the intensity scale becoming overloaded , The contrast control must be adjusted .
LCDs are more fragile than CRTs , Touching an LCD screen with your fingers hard can leave pressure marks that forever mar the display , Touching a CRT with fingers will simply leave fingerprints that can be cleaned off , If you break a CRT monitor , you can get another for free or very inexpensively , LCD’s will cost a little to a lot more to replace if broken .
They have limited viewing angle , The Brightness , contrast , gamma and color mixtures vary with the viewing angle , They can lead to contrast and color reversal at large angles , They need to be viewed as close to straight ahead as possible .
LCDs can have many weak or stuck pixels which are permanently on or off , Some pixels may be improperly connected to adjoining pixels , rows or columns , The panel may not be uniformly illuminated by the back light resulting in uneven intensity and shading over the screen .
They have slow response times and scan rate conversion result in severe motion artifacts and image degradation for moving or rapidly changing images .
LCD is not as energy efficient as the LED , In dimly lit environments , brightness is compromised , It is not as good at LED in graduating shades of color , At lower refresh rates , The motion may be blurry for some viewers .