Types of flat-panel TVs:

Types of LED TVs:

Full LED TV, also known as D-LED TV

It’s short for Direct LED TV and also called Full-Array LED TV. D-LED is a kind of method to arrange the LED backlight which several rows of LEDs are placed behind the entire surface of the screen.
The advantage is that these sets can employ “local dimming”. Local dimming means that each LED or a specific group of LEDs can be turned on and off independently within certain areas of the screen, thus providing more control of the brightness and darkness for each those areas, depending on the source material being displayed.

Edge-lit LED TV, also known as E-LED TV

beam light to the back of the screen from the sides and allow for ultra-thin cases. Although some designs provide selective dimming, they are not as effective as the full array. In addition, they have a tendency to be brighter at the edges than at the center.

The direct-lit method uses LEDs

The direct-lit method uses LEDs in a sparse array across the back and is the least expensive of the three methods. Since the LEDs are farther away from the screen to allow each light to spread to more pixels, direct-lit TVs are as thick as the older CCFL fluorescent lamp LCD TVs.

Other types of LED TV

Ultra HD or 4K TVs

Rather than using a new or different display technology, Ultra HDTVs are LED LCD models that cram more pixels onto the screen. This generates sharper, more-detailed images. Also known as 4K TVs, consumer Ultra HD sets have four times the resolution (3840 x 2160 pixels) of traditional HDTVs. However, don't expect to see a picture that's four times better. Given the dearth of Ultra HD content, the sets' mostly upscale current HD material to boost the image quality (a less than ideal solution) . 4K, under its official consumer label "Ultra HD," refers to one of two high definition resolutions - 3840 x 2160 pixels or 4096 x 2160 pixels. The term 4K is derived from its ~4,000 horizontal pixel resolution or four times the high definition resolution of 1080p. Current Full HD (1080p) implies a resolution of 1920 x 1080 resolution which equates to just over 2 million pixels. Ultra HD, at a resolution of 3840 x 2160, is over 8.3 million pixels. The pixel density of 4K resolution increases the potential draw distance of pictures, reproducing a more detailed depth than at 1080p. When used in a home context, 4K/UHD means the TV's screen has a minimum resolution of 3,840 pixels wide and 2,160 pixels high, making it the equivalent to two 1080p screens in height and two in length. This resolution was originally known as "Quad HD," and it's used by basically every 4K TV. Another resolution, known as 4Kx2K (4,096x2,160 pixels), is used by some projectors and many professional cameras. It also falls under the umbrella of 4K/UHD. Other shooting resolutions are also employed in the pro realm, depending on the camera.

Before buying a LED TV


originally, the standard refresh rate for high-definition displays. The refresh rate indicates the number of times a display is repainted per second, in hertz; a 60hz refresh rate indicates that a display is repainted 60 times per second.


quickly becoming the new standard. A higher refresh rate means a smoother picture and less motion blur.


a refresh rate sometimes seen specified for plasma displays. It doesn’t identify the refresh rate in the same way that 60hz or 120hz do. Plasma displays sample the incoming signal almost continuously and make any necessary adjustments immediately. A 600hz TV samples the incoming signal 600 times a second.


a resolution of 1920 x 1080 in a progressively scanned (rather than interlaced) display. A 1080p resolution enables display of high definition content without requiring down conversion.


The term assumes a widescreen aspect ratio of 16:9, a spatial resolution of 1920 pixels × 1080 lines (2.1 megapixels), and a temporal resolution of 50 or 60 interlaced fields per second. This format is used in the SMPTE 292M standard.


is a progressive HDTV signal format with 720 horizontal lines and an aspect ratio (AR) of 16:9 (1.78:1). All major HDTV broadcasting standards (such as SMPTE 292M) include a 720p format which has a resolution of 1280x720; however, there are other formats, including HDV Playback and AVCHD for camcorders, which use 720p images with the standard HDTV resolution.​

HDTV (high definition television)

HDTV (high definition television), is a television display technology that provides picture quality similar to 35 mm. movies with sound quality similar to that of today's compact disc. Some television stations have begun transmitting HDTV broadcasts to users on a limited number of channels. HDTV generally uses digital rather than analog signal transmission. However, in Japan, the first analog HDTV program was broadcast on June 3, 1989. The first image to appear was the Statue of Liberty and the New York Harbor. It required a 20 Mhz channel, which is why analog HDTV broadcasting is not feasible in most countries.


HDTV and standard definition television (SDTV) are the two categories of display formats for digital television (DTV) transmissions, which are becoming the standard. HDTV provides a higher quality display with a vertical resolution display from 720p to 1080i. The p stands for progressive scanning, which means that each scan includes every line for a complete picture, and the i stands for interlaced scanning which means that each scan includes alternate lines for half a picture. These rates translate into a frame rate of up to 60 frames per second, twice that of conventional television. One of HDTV's most prominent features is its wider aspect ratio (the width to height ratio of the screen) of 16:9, a development based on research showing that the viewer's experience is enhanced by screens that are wider. HDTV pixel numbers range from one to two million, compared to SDTV's range of 300,000 to one million. New television sets will be either HDTV-capable or SDTV-capable, with receivers that can convert the signal to their native display format.


In terms of audio quality, HDTV receives, reproduces, and outputs Dolby Digital 5.1.


In the United States, the FCC has assigned broadcast channels for DTV transmissions. In SDTV formats, DTV makes it possible to use the designated channels for multiple signals at current quality levels instead of single signals at HDTV levels, which would allow more programming with the same bandwidth usage. Commercial and public broadcast stations are currently deciding exactly how they will implement their use of HDTV.


HDTV uses the MPEG-2 file format and compression standard.

Set Top Box

a device that makes it possible for a television without native digital technology support to receive and decode digital television (DTV) broadcasts.

What size should I get?

Before the advent of HD, it was important to sit far enough back from a television that you didn't perceive the individual lines or dots that made up a picture (not because you'd go blind). With today's HDTV sets, however, the bigger issue is the size of your room. Consider how many people in your family typically watch at once and where you're going to put your new set. Then pick the largest screen size that will fit into that space. The sweet spot today, considering price, performance and the typical living room, is a 55-inch TV.

Diagonal Size of LED TV Minimum Viewing Distance Maximum Viewing Distance
19 inches 2.5 feet 5.3 feet
26 inches 3.3 feet 6.5 feet
32 inches 3.8 feet 7.6 feet
37 inches 4.3 feet 8.5 feet
42 inches 5.3 feet 10.5 feet
47 inches 5.9 feet 11.8 feet
50 inches 6.3 feet 12.5 feet
55 inches 6.9 feet 12.8 feet
60 inches 7.5 feet 15 feet
65 inches and larger 8.1 feet 16.2 feet

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