LCD Advantages and Disadvantages

Although not as versatile as CRTs, LCDs are being seen as the preferred display for an increasing number of applications. They can produce very bright and sharp images but can also be harder to properly set up than CRTs. This article outlines their major pros and cons arranged in order of importance. For a more detailed discussion see What Makes a Great LCD and Testing and Evaluating LCDs.

Note: most of the discussion here regarding LCDs also applies to DLP, Plasma and LCoS displays.

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1. Sharpness
Image is perfectly sharp at the native resolution of the panel. LCDs using an analog input require careful adjustment of pixel tracking/phase (see Interference, below).

2. Geometric Distortion
Zero geometric distortion at the native resolution of the panel. Minor distortion for other resolutions because the images must be rescaled.

3. Brightness
High peak intensity produces very bright images. Best for brightly lit environments.

4. Screen Shape
Screens are perfectly flat.

5. Physical
Thin, with a small footprint. Consume little electricity and produce little heat.

1. Resolution
Each panel has a fixed pixel resolution format determined at the time of manufacture that can not be changed. All other image resolutions require rescaling, which generally results in significant image degradation, particularly for fine text and graphics. For most applications should only be used at the native resolution of the panel. If you need fine text and graphics at more than one resolution do not get an LCD display.

2. Interference
LCDs using an analog input require careful adjustment of pixel tracking/phase in order to reduce or eliminate digital noise in the image. Automatic pixel tracking/phase controls seldom produce the optimum setting. Timing drift and jitter may require frequent readjustments during the day. For some displays and video boards you may not be able to entirely eliminate the digital noise.

3. Viewing Angle
Limited viewing angle. Brightness, contrast, gamma and color mixtures vary with the viewing angle. Can lead to contrast and color reversal at large angles. Need to be viewed as close to straight ahead as possible.

4. Black-Level, Contrast and Color Saturation
LCDs have difficulty producing black and very dark grays. As a result they generally have lower contrast than CRTs and the color saturation for low intensity colors is also reduced. Not suitable for use in dimly lit and dark environments.

5. White Saturation
The bright-end of the LCD intensity scale is easily overloaded, which leads to saturation and compression. When this happens the maximum brightness occurs before reaching the peak of the gray-scale or the brightness increases slowly near the maximum. Requires careful adjustment of the Contrast control.

6. Color and Gray-Scale Accuracy
The internal Gamma and gray-scale of an LCD is very irregular. Special circuitry attempts to fix it, often with only limited success. LCDs typically produce fewer than 256 discrete intensity levels. For some LCDs portions of the gray-scale may be dithered. Images are pleasing but not accurate because of problems with black-level, gray-scale and Gamma, which affects the accuracy of the gray-scale and color mixtures. Generally not suitable for professional image color balancing.

7. Bad Pixels and Screen Uniformity
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. Also, the panel may not be uniformly illuminated by the backlight resulting in uneven intensity and shading over the screen.

8. Motion Artifacts
Slow response times and scan rate conversion result in severe motion artifacts and image degradation for moving or rapidly changing images.

9. Aspect Ratio
LCDs have a fixed resolution and aspect ratio. For panels with a resolution of x the aspect ratio is 5:4=1.25, which is noticeably smaller than the 4:3=1.33 aspect ratio for almost all other standard display modes. For some applications may require switching to a letterboxed x960, which has a 4:3 aspect ratio.

10. Cost
Considerably more expensive than comparable CRTs.

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 a 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 a 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.

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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 the 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, grayscale 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 backlight 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.

The advantages and disadvantages of using LED technology

Health risks of laser & Safety precautions to avoid biological hazards of laser radiation

The importance of lasers in communication and advantages of fiber optics cables

Laser rays properties, Spontaneous emission, and stimulated emission

What Are The Benefits Of LCD Display Screens?

What Are The Benefits of LCD Display Screens?

So you&#;ve just bought an LCD screen and want to know what the benefits are? In this article, we&#;ll break it down and list some of the more common advantages of using such a monitor.

What is LCD Display Screen?

The LCD display screen is a type of electronic display device that uses liquid crystal molecules to produce images on a screen. LCD displays are thinner and more energy-efficient than their CRT counterparts, making them more popular for computers, phones, and other portable devices. Additionally, they have a longer life span and can be used in harsher environments than CRT displays.

LCD Display Screens and How They Affect Your Day

LCD displays are known for their bright colors, sharp images, and long life spans. They also offer a great viewing experience in both indoor and outdoor environments. Below are some of the benefits that LCD displays offer:

1) Bright Colors &#; LCD displays produce vibrant colors that are perfect for viewing photos and videos. This makes them ideal for use in outdoor environments where sunlight is abundant.

2) Sharp Images &#; The pixels on an LCD display are small compared to other types of screens, which means that images appear more detailed and sharp. This is especially beneficial when viewing photos and videos.

3) Long Life Spans &#; Unlike other types of screens displays, which can start to show signs of wear and tear after a few years, an LCD display can last for several decades without showing any signs of deterioration.

Conclusion

If you are looking for a screen that offers great image quality and is highly durable, an LCD display screen might be the perfect choice for you. Not only do LCD displays offer better picture quality than other types of screens, but they also tend to last longer and resist scratches and other damage better. If you are in the market for a new monitor or laptop screen, make sure to consider Aiwa LCD display screens &#; they are definitely worth your consideration!

The use of the liquid crystal display (LCD) panel as a teaching aid in medical lectures

The liquid crystal display (LCD) panel is designed to project on-screen information of a microcomputer onto a larger screen with the aid of a standard overhead projector, so that large audiences may view on-screen information without having to crowd around the TV monitor. As little has been written about its use as a visual aid in medical teaching, the present report documents its use in a series of pathology lectures delivered, over a 2-year period, to two classes of about 150 medical students each. Some advantages of the LCD panel over the 35mm slide include the flexibility of last-minute text changes and less lead time needed for text preparation. It eliminates the problems of messy last-minute changes in, and improves legibility of, handwritten overhead projector transparencies. The disadvantages of using an LCD panel include the relatively bulky equipment which may pose transport problems, image clarity that is inferior to the 35mm slide, and equipment costs.

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