Home Page - Plasma vs. LCD Summary - Plasma vs LCD (3): Functional Considerations

Plasma vs LCD TV - Comparative Guide

Choosing between a Plasma TV and an LCD Television
Part 3: Functional Considerations

In this final part of our plasma vs LCD TV analysis, we discuss how choosing either technology impacts the end functionality of a flat-screen television.  

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Plasma vs LCD: Functional Related Issues

Are there any major differences between these two different flat-panel TV technologies when it comes to issues like image retention, computer use, lifetime, bad-pixels, response time, and power requirements? 

In this final part of our plasma vs LCD discussion, we look at each of these aspects to discover more how these display technologies differ - if at all - in these respects

Image Retention: Screen Burn-In and Image-Sticking

When it comes to comparing plasma vs LCD TV sets, screen burn-in is probably one of the most debated topics by those in favor of LCD display technology.

Yet, while many are aware of burn-in in plasma TVs, few realize that even LCD TVs have their own problems - they suffer from what is known as 'image sticking'.

Though image sticking and burn-in yields practically the same visual impact on the display panel, yet these two phenomena are completely different in their nature.

Burn-in

As with all phosphor-based screens, plasma displays are prone to burn-in. Screen burn-in is a form of image retention and occurs when an image is left for too long on the screen. This results in a ghost of the image burned on the screen.

While some brands of plasma TV sets are more prone than others to burn-in, yet in general, plasma screens are more prone to suffer permanent burn-in during their first 200 hours of use. The reason is that fresh phosphors burn more intensely as they are ignited during this period.

Burn-in is the result of a damaged pixel whose phosphor has been prematurely aged, and therefore glows less intensely than those of surrounding pixels.

The presence of a static bright image for more than 30 minutes may be enough to cause temporary burn-in - often referred to as image retention or image ghosting. Temporary burn-in or image ghosting should not be cause for alarm, as normally this will wash out after several hours of use. In addition, most plasma TVs today come with built-in features to remove image ghosting once this occurs.

More preoccupying with plasma displays is the prolonged presentation of black or gray bars, say when viewing 4:3 content in its original format on a wide-screen display. This may easily lead to permanent burn-in. Once permanent burn-in occurs, the damaged phosphors in a pixel cannot produce the same levels of light as that of the surrounding pixels.

Recent improvements in plasma display technology have certainly extended the time it takes to burn-in a plasma pixel. The use of improved phosphor material, and motion adaptive/pixel orbiting preventive burn-in technology has greatly reduced the risk of burn-in.  Rather, it has got so much better that in our opinion, persons with normal viewing habits have nothing to worry about, especially after the first 200 hours of use.

Admittedly, the latest brighter yet more energy efficient plasma panels appear to be more prone to image retention during initial use due to the use of more sensitive phosphors. But as stated, image retention is a temporary state that will become less of an issue with use. In addition, it is easily removed through the use of the provided image retention remedies that come with plasma HDTV.

Worth taking note that keeping brightness and contrast levels close to the lower end of the scale - especially during the first 200 hours of use - would help reduce any potential burn-in risks, especially if the application calls for part of the image on the screen to remain static during use.

In the latter case, an LCD TV may be a better choice since LCD technology is not prone to screen 'burn-in'. In other words, no premature aging of cells occurs in an LCD TV panel due to the prolonged presence of a static image. This in itself also makes LCD TVs more suitable for computer use.

Image Sticking:

LCDs do not suffer from burn-in but they do suffer from image sticking - a form of image retention that yields similar visual results to burn-in in plasma TVs. The main LCD advantage here is that unlike burn-in, image sticking can often be reversed to the point of total invisibility.

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Image sticking is an intrinsic behavior of LCD panels. It can occur when a static image remains displayed on the screen for an extended period as a result of a parasitic charge build-up within individual pixels. This 'retained pixel charge' will prevent the liquid crystals to return fully to their 'relaxed' state upon removal of the static image.

The result is a faint, visible, retained image that remains on the screen even when the image is changed. The intensity of image retention varies among different brands. It also depends on several factors including operating temperature, image make-up, and time the static image remained on. Similarly, the level of reversing image sticking depends on the causes that led to image retention on the LCD panel. The good news is that image sticking in LCDs is quite rare under a home environment.

More information on image sticking, including ways to reverse it and how best to avoid it, is available in our article: Image Sticking in LCD Televisions.

Plasma vs LCD - Image Retention ADVANTAGE:

LCD TVs enjoys a technological advantage; they are not prone to burn-in, and image sticking in LCDs is often completely reversible.

At the same time... Burn-in is no longer much of a concern as it used to be with plasma televisions up to the recent past, especially for persons with normal TV viewing requirements. Similarly, image sticking with LCD TVs is unlikely to take place under normal home use.

Computer Use

Both the closer pixel built-up structure of an LCD referred to in our second part of this plasma vs LCD discussion, and the burn-in issue of plasma panels just discussed above, help render LCD displays more suitable for computer use.

In particular, the pixel build-up structure in an LCD panel makes LCD monitors especially good at displaying large amounts of data even at the sub-40-inch category with exceptional clarity and precision. It is also for this same reason that LCD panels tend to perform better in applications like video gaming.

Plasma vs LCD - Computer Use ADVANTAGE:

LCD, partly, because of their non-susceptibility to burn-in, and partly as a result of their ability to display detailed graphics better.

Life-time

Earlier plasma displays had a quoted half-lifetime of 20,000hrs, following which the image brightness will fall to half its original value. However, the latest generation plasma displays boost a quoted panel life of 100,000hrs. The latest LCD displays also have an expected panel life of 60,000 to 100,000hrs. It is true that quoted panel lifetime figures by manufacturers tend to be somewhat inflated, but still these figures contrast heavily with the typical 20,000hrs half-lifetime for direct-view CRT TV sets.

But what do these half-lifetime figures imply? Statistics show that TVs in an average US household remain on for over 7.5hrs a day. Furthermore, on average, a TV set is replaced every 7 years. Taking a conservative figure of 40,000 hours half-lifetime for either technology, this works out to almost 15 years of daily use before these display panels would ever need replacement.

It is thus clear that lifetime is not an issue when it comes to comparing plasma vs LCD display technologies. At the same time, keep in mind that there is no way to regenerate the gases in a plasma display, nor it is possible to repair any ‘dead’ pixels that may develop during use in an LCD panel. The only option in these circumstances will be to replace the display.

Note that expected panel life is not the same as the expected lifetime of the whole HDTV set. Expected life of the electronics inside an HDTV set is the same as that of other electronic gear and depends on various factors - including operating ambient temperature and stability of the supply voltage.

Plasma vs LCD - Lifetime ADVANTAGE:

This is a non-issue with either technology - rather it is more dependent upon manufacturer quality.

Bad Pixels

Both plasma and LCD displays may suffer from bad pixels - at times also referred to as 'stuck' or 'dead' pixels. In other words, both technologies may develop defective pixels during the manufacturing process. However, with plasma displays, bad pixels are rare.

The interesting thing here is that some manufactures are moving towards a 'zero' bad pixel policy. This means that they will replace your flat-panel TV within (typically) 6 months from the date of purchase should it develop even just one single bad pixel during this initial period of use.

The issue of bad pixels within the context of plasma vs LCD mainly arises with LCD TVs. The reason is that even if on day one, you have a perfect LCD display, the switching transistors associated with the pixels and sub-pixels in an LCD panel may still get faulty at some point later in use.

Plasma vs LCD - Bad Pixels ADVANTAGE:

Plasma - because even though some LCD manufactures are offering a zero bad-pixel policy, yet LCD displays still have a higher tendency (with respect to plasma panels), of developing bad pixels during use.

Blurring, Response Time and Fast-moving Images

Response time of LCD HDTV sets is surely among the latest battlegrounds between display manufactures. The present de facto standard appears to be the 4msec for LCD panels though with the latest 240Hz LCD TVs, LCD display manufactures are quoting 2msec response times. The latter is necessary to enable all pixels to change their state well in time for the next refresh (240Hz implies a refresh every approximately 4msec.)

But even 2msec is not fast enough in comparison to the minute fraction of a millisecond it takes to ignite the phosphor of a plasma display panel cell. For this reason, this response time debate is one of those hot topics with those in favor of plasma televisions when comparing plasma vs LCD TVs.

For a detailed discussion on this subject, we suggest that you look at our article on LCD Response Time. However, for those who would like to go for the short answer, we say that:

As things stand today, when comparing the pixel response times of plasma vs LCD TV sets, plasma TVs still have a slight edge in performance during fast action movies, sports and gaming events even over the latest 240Hz LCD HDTVs.

This edge does not arise out of the latest 600Hz sub-field drive plasma display technology - which was mainly developed by plasma TV makers to help combat the incorrect notion that 120Hz and 240Hz LCD TVs are better than standard 60Hz plasma TVs. The truth is that while LCD needs the 240Hz technology to combat motion blur, plasma is inherently less susceptible to burring and the new 600Hz plasma technology real impact on display performance is mainly to improve motion resolution. But this improvement would be hard to perceive without the use of the appropriate test patterns as plasma performance in this respect is already very good even without the use of the new 600Hz sub-field drive technology.

Plasma vs LCD - Response Time ADVANTAGE:

Plasma - because even though LCD technology have improved to the extent that this is becoming less of an issue, yet LCD technology has still some way to go to achieve the same level of pixel response as phosphor-based displays.

Panel Display Noise

An issue that often crops up with those in favor of LCD in this ongoing plasma vs LCD debate is plasma panel buzz. LCDs do not suffer from this phenomenon. Buzzing in plasma panels is normal but the level of buzzing is generally quite low and inaudible from normal viewing distance especially at daytime. In most cases, you will have to sit insanely close to your TV to hear it.

This soft buzzing noise is mainly caused by the electrical charges used to create the images on the screen. Buzzing can also result from the high frequency power drive coils in the switch-mode power supply (SMPS) board used to drive the panel.

There are many factors that can influence this plasma display panel phenomenon. For example changing the picture mode from say dynamic to a lower power one such as cinema/movie will also reduce the level of perceived noise since this affects how much power the panel is processing and the power levels processed by the SMPS board. This also explains why the perceived buzz noise changes with picture content - a bright overall scene or a too high contrast setting can generate a more audible noise level. Operating the panel at a high altitude also make plasmas more prone to audible buzzing.

Equally important is panel installation; a hard wall surface directly behind a wall mounted plasma TV will also serve as a more effective reflector than say walls that are covered in softer finishes.

Plasma vs LCD - Display Panel Noise ADVANTAGE:

LCD - even though the level of buzzing noise in plasma is exceptional low. Still, if you are after super quite operation at very close viewing distances and extended use with the volume turned off, like in applications where the TV is also serving as a big PC monitor, then LCD offers a better option.

Power Requirements

Up to a year ago, this was one of those few issues in this plasma vs LCD TV analysis where LCD TV sets enjoyed a clear-cut advantage. However, the latest energy efficient plasma display panels from LG, Panasonic, and Samsung have significantly reduced the LCD power advantage. These new plasma panels consume some 40% less power than previous generations for the same brightness levels.

LCDs still have an advantage in this area; this arises out of the way LCDs use a backlight source to produce images. Backlighting of a display panel to produce an image requires less power than to light the individual cells in a plasma display.

Another major difference between plasma and LCD technology is that plasma displays require more power both with increase in pixel count - i.e. 1080p plasma displays use more power to operate than equivalent screen size 720p plasma sets, and also to display brighter objects. On the other hand, LCD panels generally require more power when handling large areas of dark subjects over a bright background. This in view that for an LCD display to present a dark subject, more pixels will have to be activated to block more of the light produced by the backlight source from reaching the display surface.

Actual power requirements in LCDs depend mainly on the technology used for the backlight. LCD panels using standard CCFL-based backlight systems require typically 30% less power than 1080p plasma displays of the same screen size; they also require some 20% less power than equivalent size 720p plasma displays. This difference in power requirements between the two display technologies becomes more pronounced as one moves towards the larger end of the scale, i.e. 55-inch and above. LCDs using LED backlights are even more energy efficient - with edge-lit LED TVs using less power than corresponding LED TVs using local dimming technology.

The table below shows how typical power requirements vary with different display technologies and different backlight systems.

Plasma vs LCD - Power Requirements Comparative Analysis: The table below depicts the actual power requirements for the selected LCD TVs and plasma television sets:

Worth taking note that it is possible to reduce the power requirements of an LCD TV or a plasma television by simply applying the correct settings for the contrast and brightness levels to better suit your home environment. Again, the actual savings are highly brand dependent but the energy savings resulting from proper calibration may very well approach 40%.

However, HDTV selection is a first step in this plasma vs. LCD process. If energy efficiency is really a priority, then you have to 'watch' also your TV viewing habits. I suggest you check out the following Energy Efficient TV article at www.Green-Energy-Efficient-Home.com for some interesting tips on how you can cut your energy bill by choosing more efficient habits.

Plasma vs LCD - Power Requirements ADVANTAGE:

LCD - because despite that the latest plasma display panels are significantly more energy efficient than previous versions, the use of a common backlight source in LCDs is inherently more energy efficient than lighting the individual pixels in the cell-structure forming a plasma display.

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