Full HDTV Reviews

Just what is full high definition television (FULL HD TV)? We are constantly bombarded with the term high definition. We have alternate channels that offer high definition, but to many viewers, the term falls short of ‘well, do I really need high definition?'

Full high definition television (FULL HDTV) offers a superior quality picture and sharpness unlike any television has offered prior. A full high definition television can offer a higher resolution of 1920 by 1080 pixels, which can give a viewer increased quality, color and crispness to their screens.

High-definition television is simply a television which offers a higher resolution than a digital or analog broadcasting system. The main difference between high definition and regular digital, despite the fact that high definition is a variation of digital broadcasting, is that high definition television, though digital, requires less bandwidth when used in conjunction with lower video compression. First developed in the 60s, after years spent developing the television set and cathode ray, the Japanese established the system which would eventually become high definition television. Yet, it was publicly announced for another thirty years.

High definition television systems utilize the 5:3 aspect ratio, which allows for a wider screen image than the traditional 4:3 aspect ratio. However, the systems are transferring to a 16:9 aspect ratio, instead of the 5:3 aspect ratio, because it is more readily available in widescreen cinema formats.

Some television sets are simply high definition ready, which means that they are capable of providing a picture that is 1280 by 720 pixels. However at this resolution, the screen will have some distortion and will lack the crispness a full high definition television will have. High definition systems utilize what is called progressive scanning, which simply offers all the lines in the image, or complete image frame per each refreahing of the image. It also can utilize interlaced scanning, which draws in every second line of the frame, or a partial image field, during a first pass through the image downloaded, and then fills in the remaining lines with a second image refreshing pass. While it may sound like the progressive scanning is better than interlaced scanning, they are primarily the same, in that a viewer is unaware of the partial image downloaded in the interlaced scanning.

The reason interlaced scanning is offered is that it requires a significantly lower signal or data bandwidth, but an interlaced signal will unfortuantely loses almost half of the vertical resolution. While some compensation is offered where interlacing scanning is concerned, it is, however, that an interlaced mode provides finer time-sampling, giving two (half-resolution) image samples in the same time interval as one (full-resolution) image sample in progressive mode. At 720 lines of progressive scanning, that is, how many lines are progressively scanned from top to bottom, and 1280 lines interlaced within the progressive scanning, there are few lines to capture the image, so distortion will occur. With a Full high definition television screen, the television has more lines scanning vertically and horizontally, so that more definition can be seen in the image. This means that the ATSC can offer theater quality image on a smaller screen. Within the United States, the standard for televisions screens is 1080p, but the rates of frame per minute range from 24 seconds to 30 seconds, or 1080p24 to 1080p30.

LCD television screens are the current trend in home entertainment systems. LCD, or liquid crystal display, utilizes a flat, crystalline surface with mono or color chromed pixels in a reflective pattern. Since LCD television sets have a lower resolution that full high definition television or high definition ready, the expanded image will pixilate and distort. LCD screens, unless they state they are High Definition Ready, will not offer the image a regular screen will have with high definition. LCD televisions produced today are meeting the high definition ready regulations of at least 1080 lines of progressive scanning.

1. This layer houses a polarizing filter film that has a vertical axis. This axis polarizes any light as it enters through the film.

2. The second lay is a glass substrate that has ITO electrodes within it. The electrode shapes determine what shapes will appear when an LCD television is switched on. There are vertical ridges etched into the glass.

3. The third layer is a twisted nematic liquid crystal layer.

4. The fourth layer has another glass substrate with another electrode film that has horizontal ridges to align with a horizontal filter.

5. A polarizing filter film that has a horizontal axis is in the fifth layer that allows or blocks light.

6. The final layer in the LCD display, it is a reflective surface to reflect light back to viewer. (Within a backlit LCD screen, this layer would be replaced with a source of light.)

Within the multiple pixels of an LCD houses there molecules laid into multiple layers that is aligned between two lucid electrodes, with two filters that are used to polirized the image, and in most cases, the axes of transmission that are positioned perpendicular to each other. There is no crystal liquid layer between these polarized filters. When light is shown through a first polarized filter is blocked by a second filter.

The electrodes floating on the surface come in contact with the LCD material. The material is combined so as to line the LCD molecules in one direction. To do so, the treatment of the LCD material consists of rubbing a thin layer of polymer material unidirectionally. The LCD is defined by the direction of the alignment of the material. To make the electrodes appear transparent, they are struck with a conductor named Indium Tin Oxide or ITO.

When an electric field is applied to the LCD molecules, the LCD molecules are aligned by determining the surface alignment to the liquid crystal material. To do this, a liquid crystal device applies two electrodes to the material causeing the molecules to align on a twisted axis. With light being passed through a filter, it is inversed with a helix of LCD material. After it is inversed in this helix, it is passed through another layer of polarization of liquid crystal material. What light is passed through the first filter is effectively blocked by the second layer. Ionic compounds make up both the LCD material and the layer of alignement. The device performance can be degraded if an electric field of a certain polarity or another is continuously exposed to the LCD material, it can cause a burn out and destory the ionic material. To avoid this possibility, the LCD material is exposed to alternating and reversing electrical fields.

Plasma display in a television is largely housed in a flat panel and designed for larger screen televisions. Within the panels of glass are inert gases called Neon and Xenon. These noble gases convert into a plasma material when exposed to electrical current to illuminate the televisions screen. The plamsa display was invented within the United States, as opposed to the Asian inspired LCD technology. In the early 60s, professors at the University of Illinois at Urbana-Champaign developed the technology which we would come to know as plasma. Popular with the PLATO computing system, the plasma screen were hardy and needed no memory to allow images to refresh. This meant that the screen was utilizing less energy when refreshing. It is this fact that has made plasma screens popular with the high defintion craze. They have a faster response time, a wider coor spectrum available for images and a wider angle for viewing which makes the plasma television screen a perfect choice for high definition. However, LCD technology is closely catching up to the brilliance of the plasma screen. Plasma television screens have a longer life, averaging around sixty-thousand hours of viewing, or twenty seven years.

Choosing between the LCD screen and a plasma television can leave many consumers scratching their head in confusion as to what type of television they should get. If you are going for high definition, is it better to choose the LCD screen, or does plasma offer the best image? The basic principle for LCS is that an LCD screen basically is a reflective surface. Its picture constitutes light passing through crystals floating between glass layers. With different types of electrical currents passing through the liquid crystal, the light is subjected to being reflected or being blocked. After the image is created with reflective principles, the image has color added by passing the light through an RGB, that is, red, green and blue filters.

LCD screens have an unique ability to avoid reflections, which can be quite annoying when you are watching television. A light reflective glare can disrupt the sight line of a viewer. But LCD screens do not utilize a high glare glass, so reflections are not a problem for viewers. It has a full contrast field for brightness and all color is naturalistic and as close to reality as possible.

With the addition of the inert noble gases Neon and Xenon, the plasma television system contains thousands and thousands of cells sandwiched between two panes of glass. Electrodes placed between the two glass panels, one in front of the cells and one behind them. As the address electrodes sit behind the cells, the transparent display electrodes are placed behind the cells. The transparent eelctrode is covered in a layer of magnesium oxide for protection and is surrounded by di-electrical and insulatig material. Exposing the cells to the electrodes and the voltage it creates, the gas is forced to ionize and becomes plasma. Once the gas is ionized to runs to the electrodes where it collides with the material and produces a light.

However, this still does not answer the question of which one is better for your needs. Just which one, LCD or Plasma, is better suited to meet your high definition television needs? Is there one that is better than the other? Unfortunately, the comparsion of these two technologies is like comparing apples to oranges. While they are seeking and achieveing virtually the same thing, a clearer, crisper, and more brilliant picture, there is little else to distinguish one as better than the other. They are similar in end products, they are only different in the process to which they show their image.

To break down the technologies, you have to look at the points where the screens differ. Consider the black levels on both the LCD and Plasma screen. A plasma screen can offer a contrast ratio of 3000:1, though most manufacturers are truly around the 1450:1 contrast ratio. Panasonic is one of the leading manfacturers who has a 1450:1 contrast ratio. Plasma televisions display darker colors by blocking certain pixels with algorithms set internally which force the pixels into a dark or black color. This unfortunately can limit the visiability of the gray scale. Plasma televisions can produce an audible bussing sound when attempting to produce lighter colors, as when plasma is creating lighter colors it uses the most energy within its internal system.

Conversely, LCD screens uses the most electricity when developing black pixels. Since LCD screens are designed to block light to create darker images, it makes sense that the screen would use the most energy when showing darker or black colors. LCD screens only have about a 1000:1 contrast ratio, which gives plasma televisions the advantage where the black levels are concerned. Where images utilize both dark and light colors simutaneously, such as the case with DVDs and gaming cubes, plasmas outperform LCD screens. Plasmas have the capability of combining vast amoutns of dark and light at the same time, where LCD fall short of the contrast values.

Considering color, each of the pixels within a plasma screen contains the RGB, red, green and blue spectrums, which creates a more naturalistic and realistic color story. LCD, while they have a higher number of pixels per each square inch, LCD colors can appear dingy or overly green. Since LCD creates color by light manipulation and blocking colors, it can produce a brighter image than a plasma screen, but where colors are concerned, LCD screens are not as realistic as their plasma counterparts. However, they excel in rooms that are overly bright. Their anti glare technology can actually make a LCD screen a better choice for brightly lit rooms and offices, where plasma would appear darker and muddier.

However, LCD televisions cannot compete with Plasma screens when it comes to color, clarity and crispness of image. LCD televisions can offer excellent images, but plasma screens have the best resolution and screen image available to date. Plasma televisions handle angles and colors much better than LCD, including that awful black tone that does not always look right on LCD screens. Plus Plasma televisions are a better buy for the money. Yet LCD televisions are popular, mainly do to the price point.

The number of televisions manufactured with 1080p ability is increasing dramatically each day. In fact, most televisions manufactured after 2005 offer the 1080p. By the following year, almost all manufacturers offered a 1080p format in their televisions. When it comes to high definition television sets, some of the major brands that set the stage for quality picture have to be Sony and Samsung. These two are leaders in high definition televisions sets. Sony offers what is known as the WEGA system, that is, a system that utilizes digital processes, and minimizes the digital to analog conversions some sets have. This keeps the video image at the highest quality possible. The Sony KE-32TS2 television is a well-formed, well designed Plasma HDTV. With a smaller television screen dimension, this design is both its greatest strength and worst fault at one time. Since the Sony KE-32TS2 has a slighter screen size, quality of image is outstanding, with remarkable clarity and color replica. Yet many consumers find that a widescreen television of 32 inches is merely too little for the most rooms in a household. After that, there are very little other restrictions, but the few they have are inadequate signal input, and darker color tones that leave little to the imagination. Some of the pros of the Sony KE-32TS2 is its exceptional brightness on the whole, crisp and clear images, and reproduction of color is very high-quality. Most HDTVs, like the Sony, have exceptional display capabilities and image quality is very naturalistic. The sony televisions have a built-in screensavers to thwart ghosting and image burning into the plasma screen, which is a problem with some HDTV. The plasma television unfortunately have problems with darker colors and tones. The letterbox format can fade after time, leaving graying boxes instead of black strips. There are only a few inputs for selecting, and most of the inputs need adapters.

With the XBR6 models, they tend to be the lowest end of 2008 sony models. There are five sizes available for purchase - 32, 37, 40, 46, and 52. Yet, the 32 and 37 inch LCDs are styled differently than the others. Both the 32" and 37" Sony Bravia sets do not have the MotionFlow technology that is available in the much larger XBR6 television sets. The TV Guide feature is not available in this model. There are three models that contains a refresh rate of a 120Hz. They offer USB ports that allow s and music photo playback. It has four HDMI inputs as did previous makes. The XBR6 will be continuing the pro full video processing in the XBR5 series which has assisted Sony surpass competitors with offering greater processing creating smoother images. The PRC-MFv2.5 processor generates a elevated compactness video signal that is unmatched. More technology enhancements from the previous cycles, the Bravia XBR6 series offers 10 bit processing with a 1080p display screen.

The XBR7 series is available in two screen dimension sizes: 40" and 70". Additionally, there are the improvement to the LCD in the XBR6 cycle such as refresh rate of 120Hz which can eliminate any lags in motion, and better color information for better images. This video processing technology pulls from the prior video processing to full digital which gives the Bravia a higher level of motion artifacts, video noise, and motion blur elimination. Additionally, there is a RS-232 plug-in port within the XBR7 cycle to help any installers added.

The 2008 top of the line sony model has to be the LCD model XBR8 series. Additionally, there are many outstanding features available on all of the XBR5, XBR6 and XBR7 the KDL-46XBR8 models. The sets have such features as localized dimming to enhance the contrast in specialized vicinity on the television screen to augment contrast in specialized areas while leaving other areas alone. To accomplish this feat, the XBR8 utilizes a backlight, an appealing quality for any consumer. A light emitting diode or LED is responsible for the backlight, a feature which utilizes this light rather than adding typical fluorescent lights. This feature can significantly enhance the vividness and the contrasting as used in prior models can create a better image. The LED utilizes a three color spectrum-red, green and blue, which Sony calls triluminos. Sony also incorporates this feature within the KDL-46XBR8 model. The KDL-46XBR8 models have compliance with DLNA features for more realistic color performance, and the ever present, newly revamped, yet optional, speaker grille colored to your specifications.

Samsung offers LCD, plasma and high definition television all available at your local store. Samsung also has a touch of color design that is stately and unique to their screens. Samsung has four different models available for purchase. With the LN22A450 series, the LCD Television offers a resolution of 1366x768 or 720P. However, this may not be the highest level of resolution available with televisions, it is usually considered adequate for upwards 95% of programming available for viewing including most of the available programming in high definition. There is a major and essential improvement from previous makes, particularly in the 450 series. The 450 series has improved potential, predominantly where digital-system devices. Such accessories as portable DVD players and high definition video recorders can benefit from this system. The 450 cycle have mounted ports for input on the side for better connectivity with any accessory devices and there are remote controls that offers accessible keys for easy access. The next line of Samsung models is the 550 model. With additional features and the features seen with the 450 make, the 550 series is available with a sleeker design and touch-sensitive controls that give you manual options. Without buttons on the side, like the 450 series, the buttons have been removed and there are more inputs available for HDMI accessories, with one of the input available side mounted.

With the features upgraded in the 550 series, the Samsung LCD television sets in the 650 cycle has a substantial increase in features available. Upgrades in the Samsung 650 models include the patented ‘Touch of Color' that inserts a lucent red hue in the LCD framing. Upgrades are plentiful in the models available over the 550 models, not limited to improved angles of viewing from all angles, improvements in pictures, response rates in faster time. Additional improvements include automatic motion technologies that runs at 120Hz, reduction in motion blur for better image value particularly where sports and video games are concerned. The LCD television boasts deeper darker tones and levels of black, further reduction of glare on angles, and is capable through an input of a 1.3 HDMI network. It has improved remote control ability with its key remote control function and a new content organization interface available in the menu. Adding to the huge advances in features and functionality above the other series available with Samsung is the 750 series. Improved features within this LCD series of televisions take multi media and network capability to a advanced level. It is JPEG and MPEG compatible utilizing an ordinary USB 2.0. The 750 LCD series has a MPEG3, or Home Viewing, gallery with an interior flash memory with quality content and improved audio technology with an incorporated woofer design.

Panasonic has created the Viera television system, which offers television owners a stunning image quality, better connectivity to your television line and a support system like no other. The Viera television is available in LCD and plasma, as well as high definition television. They are also aesthetically pleasing in that they offer a television within a picture frame, so your flat screen does not look like a screen attached to a wall, but looks like a piece of art. The Panasonic system offers superb viewing, despite the angle you are view at. With a wide viewing angle offered on the IPS, or In-Plane Switching, LCD screen allows you take pleasure in an astonishing picture from every angle in the room. Colors are lucid and vibrant despite where you are sitting in the room. This means every angle has the same image. The television set features an enormously large viewing angle, reaches 178° viewing area, so no matter where you are in the room, you'll still get same brilliant image quality.

The widescreen aspects of the television features a height to width ratio similar to that seen in cinema screens, giving a movie quality experience at home. View and widescreen DVDs and HDTV broadcasts can be seen as they are intended to be seen the way they were meant to be seen.

DVDS and HDTV broadcasts present additional detail and better color than previous analog television broadcasts, and to deliver that that picture information it takes a high-resolution screen, which Panasonic has. The high count of pixels in the Panasonic LCD television set gives finer details for exceptional HDTV quality. Additionally, with the availability of more pixels on the display decodes into diagonal and curved edges look natural and smooth.

With the Panasonic ‘EZ Sync^TM HDAVI Control,' viewing a movie can be as quick as a press of the button. A touch off the television remote control can turn the television on and off easily. With the ‘EZ Sync,'accessories can be added automatically and instantly. This system is easy and makes viewing DVDs easier than ever before.

With the Panasonic television, there is only one cable needed for a high quality hook-up. Even if you have a reasonably complicated home entertainment system setup, you there is probably a tangle of cables hidden behind it. Now imagine having all those many cables replaced with a single cable that handles everything. Between video and audio, all the television needs it one cord. With this new HDMI standard, one cord is all you will need. The HDMI connector available on this television set accepts high quality digital audio and video via the same cable, meaning that your television and your home entertainment system will exist only with one cord.