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» Samsung LN-T2642H 26 inch 720p LCD TV with HDTV Tuner - Review
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April 17, 2007
Samsung LN-T2642H 26 inch 720p LCD TV with HDTV Tuner - ReviewThe Samsung LN-T2642H is a 32 inch, 720p high definition format (1366(H) x 768(V) pixels) LCD flat panel TV. It has an attractive, slim, black bezel, twin hidden bottom speakers holes in the rear matching VESA standards for wall mounting. The swivel stand allows +/-15° of movement providing set-up flexibility. The wide viewing angle of 178º(H) / 178º(V) combines to make it even easier.
S-PVA (Super Patterned-ITO Vertical Alignment)Samsung’s S-PVA (super patterned vertical alignment) technology is used for its larger flat panel TVs as its alternative to twisted-nematic used by other manufacturers. S-PVA provides very wide 179 degree viewing angles due to the electrodes inside the panel being calibrated at regular intervals to adjust the alignment direction of its liquid crystal molecules. Built-in Digital HDTV TunerThe LN-T2642H comes with a built-in digital ATSC HDTV tuner - so a separate set-top box is not required. Advanced Television Systems Committee (ATSC) sensitivity specifications for digital television are established as the result of a collaboration of broadcasters, consumer electronics manufacturers and semiconductor manufacturers. The Samsung LN-T2642H scores well in the important picture quality areas of color, contrast ratio. Aiming to be the best LCD TV, the Samsung LN-T2642H LCD high definition television scores well in all three areas.
Contrast RatioThe LN-T2642H has a static contrast ratio of 1,200:1 and a dynamic contrast ratio of 7000:1 (contrast levels are adjusted on a scene by scene basis). With a dynamic contrast ratio of 7000:1 the LN-T2642H equals the 7,000:1 ratio achieved by the Sony BRAVIA LCD TV range and is ahead of Panasonic and JVC having 3000:1 and 1,000:1 ratios respectively. Samsung don’t state if they use the more conservative ANSI test or the Full On/Full Off for contrast ratio measurement but, the contrast ratios are satisfactory in either case. CCFL BacklightTo achieve a wider color gamut for more natural colors, Samsung, like most manufacturers, uses a CCFL (Cold Cathode Fluorescent Lamp) backlight. Most manufacturers use CCFL technology as for a comparatively low price it has a 50,000 hour average lifetime, reasonably low power consumption, high brightness efficiency and good color uniformity. The main emerging challenger to CCFL is Light-Emitting-Diode (LED) technology which offers better power consumption, a even wider color gamut, and a mercury-free source of light (CCFLs use a small amount of mercury). CCFL manufacturers have narrowed the color gamut gap but, LEDs can provide 100+% of the NTSC (National Television Systems Committee) color standard compared to 92% coverage in the case of the LN-T2642H. The higher cost of LED backlighting has held back manufacturers from launching products however, Samsung is going to test the water shortly with a 24-inch LCD panel with an LED backlight. The LED-backlit monitor panel has an industry-high color saturation level of 111% (of NTSC standard) compared to a saturation level of only 72% of NTSC for conventional monitors It also supports WUXGA resolution (1,920×1,200 pixels), which is the computer equivalent to Full HD resolution. 1080p High DefinitionThe Samsung LN-T2642H LCD television’s 720p format is one of the six Advanced Television Standards Committee (ATSC) formats for digital broadcasting considered to be HD. As well as greater image detail, high definition formats also have a couple of other advantages:
The second advantage is the reason why manufacturers, who are constantly pushing display sizes upward, are also calling for even higher resolution formats to be added to standards. A higher resolution format, 1440p, has already popped its head above the consumer electronics horizon. It is already part of the new HDMI 1.3 specification and will probably enter the general public’s consciousness sometime in 2009. Video ProcessingConversion of all incoming video signals to the native resolution of a particular display requires the incorporation of a video-processing chip. A secondary but, equally important, task of the video processor is the enhancement of images to remove any artifacts which may have come from resolution conversion or video transmission. As a consequence of its vital role, the video processing chip can have a dramatic effect on picture quality. It is even more important with larger displays as they will naturally magnify and image defects which may be present in lower resolution video sources. The Samsung LCDs have a 10bit video processor in line with most other manufacturers. The best way to judge performance is to view the television displaying a range of different format video sources. SoundThe Samsung LN-T2642H has SRS Lab’s patented SRS TruSurround XT surround sound technology. TruSurround XT is a multi-channel virtualization technology which aims to produce a surround sound effect using only two speakers. It will handle up to seven (6.1) audio channels. TruSurround XT combines three patented sound processing techniques from SRS Labs:
TruSurround will produce a two channel stereo output from mono, stereo, or multichannel input signals. It is compatible with signals that been decoded by a Dolby Pro Logic or Pro Logic II decoder and signals that have been encoded to stereo with a matrix encoder (e.g. SRS Circle Surround or Dolby Pro Logic). For more information on the equipment supplied by SRS Labs can be found on their web site. Response TimeThe response time for the big screen LN-T2642H is quoted as 8ms which falls in line with those quoted for Sony and Panasonic LCD televisions. However, the Sharp AQUOS leads the pack with a fast 4ms response time. However, one must be careful comparing display response times as there are different ways reporting and measuring them. The most common methods are “rise-and-fall” and “gray-to-gray”. The display industry association, VESA (Video Electronics Standards Association), has a technical specification for rise-and-fall but, not for gray-to-gray. Rise-and-fall is the time taken for a pixel to change from black to white (rise) and back to black again (fall) while gray-to-gray is the time to change from one shade of gray to another. There are numerous arguments abounding about which is more relevant to assessing a displays performance and for the moment it is simply worth being aware that like is being compared with like. Useful FunctionalitiesThe Samsung LN-T2642H has a number of useful features including:
ConnectionsThe LN-T2642H has a good range of connections including three HDMI (High Definition Multimedia Interface) and a PC (RGB) input. A full connection list is provided in the specification at the end of this review. Samsung provides mounting holes at the back of its LCD TVs which are based on VESA (Video Electronics Standards Association) standards. WarrantySamsungs LCD, high definition televisions are backed by with a fairly standard 12 month warranty. Comparison Samsung LN-T2642H LCD TV vsApart from the different screen sizes, all the Samsung N-TXX42H models have the same specification. As well as the different high definition resolutions of the LN-TXX42H (720p) and LN-SXXXXD (1080p) series, other major differences are:
Other 720p high definition TVs of LN-SXX42H series produced by Samsung include the 32 inch LN-T3242H, 40 inch LN-T4042H and the 46 inch LN-T4642H. Larger name brand competitors with the Samsung LCD TV range include Sharp’s AQUOS range and Sony’s BRAVIA range. Further ReadingPtek has recently reviewed similar size LCD televisions including the Sony 32 inch Bravia S series KDL-32S2400 720p LCD HDTV and the Sharp AQUOS 37 inch 1080p LC-37D90U LCD TV. Presentation Technology Reviews recently looked at newcomer NuVision’s 42 inch 1080p LCD television. Specification Samsung LN-T2642H LCD TV
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