The Pros and Cons of LCD Displays

Everything from TV’s to monitors can be found in LCD in today’s modern world. A quality industrial LCD display provides you with a clear, crystal picture that can’t be beaten anywhere on the market today. However, as with any type of modern invention LCD’s come with their own set of pros and cons. Read on below for a few of the advantages and disadvantages of going with an industrial LCD display.

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Pro: Extremely High Resolutions

You can find LCD displays in about every resolution possible. From -p for cable display to 720p for plasma displays, if you need it, it’s most probably out there for sale.

Con: Sort of Expensive for the Size

It is rumored that LCD is a little bit more expensive than your average plasma flat panels on the market today. If, however, you really want a display that pops, LCD is the best bet for you.

Pro: Awesome Picture

The picture that you get with an LCD display cannot be beaten. Instead of a traditional bulb, newer LCD displays use LED lighting, also known as a light emitting diode. This allows it to have a more daylight looking effect, instead of a yellowish light that is common with normal bulbs.

Con: Viewing Angle is Limited

While they are getting better with time, LCD’s tend to have a limited viewing angle. If you aren’t sitting right in front of the screen, it can be hard to see.

Pro: Energy Efficient

These types of displays are said to be the greenest option on the planet. They are designed to use less energy and seem to be doing so well. If you are environmentally friendly, like everyone should be these days, then you should go with LCD, for this very reason.

Pro: No Burn In

One of the biggest benefits to LCD displays is the lack of burn in. If you play a lot of video games or do stuff where there isn’t a lot of moving around on the screen, then LCD displays are for sure the best bet for you.

These are just a few of the pros and cons of LCD displays. If you are still on the fence, do your research, read some reviews on social media sites and then make the choice that is the right one for you and your needs. LCD industrial displays are here to stay.

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.