Features and advantages of LED TVs

When consumers are selecting a TV model, they often encounter unfamiliar terms and modern technologies. One such example is LED technology, which many people are unfamiliar with and do not understand how it works. However, LED TVs are currently the most popular type of flat-screen TVs and are commonly found in households. It is important to understand the meaning of LED, the differences between LED TVs and other types of TVs, and the advantages they offer before making a final decision.

Definition and features

If we take a literal translation, LED stands for light-emitting diode. However, it is understandable that this alone does not provide a complete definition. In reality, the modern LED TV is actually a type of liquid crystal panel that has been well-known for a long time. The main component of this TV is an LCD matrix with numerous luminous points known as pixels. While traditional LCD devices utilized fluorescent lamps as their backlighting, LED TVs, as the name suggests, employ a more advanced version of LCD technology.

The developers at Samsung were the pioneers in adopting this innovative technology. They cleverly marketed their new TVs as LED TVs, a name that is still commonly used today.

LEDs serve as sources of light emission in this case, but they are not the actual component that creates the image. Consequently, it would be more accurate to refer to these panels as LCD TVs with innovative LED backlighting.

Types of LED backlighting

To comprehend the core characteristic of such equipment, it is imperative to grasp the various types of TV backlighting. Presently, multiple systems are employed, distinguished by their color and positioning methods.

By the color of the light sources

1. The use of white LEDs, also known as single-color systems, is a cost-effective solution that surpasses fluorescent lamps in terms of performance. Not only are LED lights more energy-efficient, but they also do not contain any harmful mercury. In terms of color accuracy and overall coverage, LED TVs with this type of backlighting are comparable to LCD TVs, with more substantial distinctions appearing in the next variant.
2. RGB or multicolor system. The RGB or multicolor system offers a wider color palette, resulting in improved color rendering. However, it is important to mention that models with this type of backlighting are typically more expensive, considering the achieved effect. Additionally, these models require a powerful graphics processor and consume more electricity. As a result, HDTVs with RGB backlighting may not be accessible for all consumer groups. As a solution, forward-thinking companies are opting to discontinue RGB backlighting and explore alternative technologies.
3. QD Vision or mixed backlighting. It is a technology that utilizes pure blue LEDs and a specialized film containing quantum dots in green and red colors. This unique combination allows for the emission of a precisely controlled and calibrated spectrum of light waves, thereby expanding the range and vibrancy of colors produced. Unlike traditional RGB LEDs, this technology is also more energy-efficient. A prominent example of mixed backlighting can be found in the Bravia line of TV panels from the renowned manufacturer Sony Triluminos.

There is ongoing debate about the use of the first and second backlight options. Toshiba, a renowned digital technology developer, argues that white backlighting is significantly more efficient than RGB. So why invest a large amount of money when millions can be saved?

On the option of backlight placement

Here, we have two choices available.

1. The first option is the Edge LED technology, which involves a single-color system (white LED) located on one side (usually at the bottom), on the parallel sides, or around the entire perimeter of the LCD matrix. The specific arrangement of the side backlighting depends on the diagonal size of the screen. However, this type of backlighting has some drawbacks, such as "backlights" visible on the edges of the TV screen and relatively lower contrast level compared to the second type. Nevertheless, this technology allows the production of ultra-thin panels measuring just a few millimeters.
2. Located directly behind the LCD panel is the Direct LED technology. This technology relies on a uniform arrangement of diodes that covers the entire screen area. Although it is more expensive compared to edge-lit technology, it offers the advantage of local dimming. This means that specific areas of the screen can be dimmed or turned off, resulting in improved image quality. Both white and colored LEDs can be used with this technology, further enhancing the visual experience.

If you already own a TV like this and are experiencing issues with the display, you may find the following information on DIY LED backlight repair helpful.

Advantages of LED TVs

LED panels have numerous advantages, making them a popular choice among consumers. Here are some of the main benefits:

1. Ultra-thin design: LED technology allows for the production of slim models, making it easy to mount the TV on a wall using a bracket.
2. Superior image quality: LED TVs offer excellent image reproduction and allow for adjustments to contrast levels. Unlike LCD panels, which often struggle with displaying moving objects, modern LED screens eliminate such issues.
3. Energy Efficiency. The main factor that appeals to many buyers is energy efficiency. Compared to previous versions, LED devices consume 40% less power.
4. A wide selection of models is available, both in terms of functionality and appearance. These panels can easily enhance any interior design. Leading manufacturers offer a wide variety of models, including classic designs as well as unique shapes and colors.
5. Durability. With the use of burn-in resistant LEDs, TVs have a longer lifespan.

However, the advancements in TV panels do not stop there. Currently, stores are stocking OLED TVs, which utilize organic LED backlighting. These TVs have a sleeker design, lighter weight (relative to their screen size), a wide viewing angle, no "backlights" or glare, and exceptional color reproduction. However, this doesn’t mean that lower-class models will lose popularity. These innovative technologies come at a high cost, making them unaffordable for most consumers. As a result, the demand for simpler LED TVs is not expected to decline in the near future. For a detailed comparison between LED and OLED TVs, refer to the article on the differences between these two types.

How to choose an LED TV

There is a wide selection of LED models available in today’s market. For consumers who are not knowledgeable in this area, making the right choice can be quite challenging. It is crucial to consider the important technological features and carefully evaluate the need for their presence when making a decision.

Backlighting

There are various options available in the market when it comes to backlighting. The modern models utilize either DirectLED or EdgeLED technology, as mentioned earlier. Both of these technologies have their own advantages and disadvantages.

Advantages of Direct LED:

• It provides a good margin in terms of brightness and contrast.
• The diodes are evenly distributed.
• There is no specific backlighting at the edges.
• However, it has a decent thickness.
• It consumes a high amount of power.

Advantages of Edge LED:

• Flexible adjustment of color gamut;
• Ultra-thin body;
• Low energy consumption.
• Edge LEDs may cause glare on the edges, especially noticeable in dark scenes;
• The cost of Edge LED models is slightly higher than that of DirectLED.

Important! The technology used to build the backlight plays a non-decisive role. The most important factor is the quality of its performance.

Screen resolution

In today’s digital TV era, there is no point in investing in HD-screen resolution technology. Optimal resolution is Full HD (1920 by 1080 pixels).

The selection of resolution depends mainly on the screen size. The larger the diagonal, the clearer the picture should be. For instance, for TVs with a screen size of 50 inches or above, it is advisable to consider a 4K-format option (4096 by 2160 pixels) to avoid any "soapy" visuals.

Dimensions

If the equipment is going to be placed on a regular cabinet, the thickness and weight are not significant factors. The important thing is to find a stand that is the right size and allows the model to stand securely on its legs. However, if the TV is intended to be mounted on a vertical surface or suspended from the ceiling, it would be preferable to consider thinner and lighter models.

Screen refresh rate

This parameter is commonly represented as hertz (Hz). Digital TV broadcasts with a refresh rate of 50 Hz, which is sufficient for smooth visual representation of moving images. However, as more advanced content emerged, the "normal" screen refresh rate became insufficient.

To address this, TV manufacturers such as Sony and Samsung developed a solution by incorporating intermediate frames, effectively doubling the scanning level to 100 Hz. Some models can even refresh the screen at a rate of 200 Hz.

To implement this technology, an innovative backlight scanning technique called Scanning Backlight was introduced. TVs equipped with this feature can effortlessly play 3D content without any stutter or lag. To test the scanning of a TV, simply play a dynamic scene: the picture should appear smooth, with clear and distinct outlines for each detail.

Screen coverage

Here we provide both a glossy and matte finish. Choosing the matte option can help reduce glare, however, it may slightly affect the image clarity. On the other hand, the glossy finish offers excellent contrast, brightness, and saturation for the overall picture quality. However, it should be noted that the glossy surface may result in some glare, especially when viewing the TV in daylight.

Interfaces

Today’s world is filled with a wide range of gadgets. These include speakers, multimedia centers, mobile devices, computers, and more. It is ideal for a TV to have the necessary interfaces to connect with these devices. In many cases, having HDMI and USB ports along with audio outputs is sufficient.

SmartTV

The justification for incorporating "smart" capabilities into television sets is evident. This technology effectively transforms the TV into a personal computer. With a SmartTV, users are able to not only view photos and videos, but also browse the internet, play games, and access other features that would typically be unavailable on a regular device.

The implementation of such functionality is made possible through the utilization of a local operating system. Various platforms like Android, WebOS (LG), and Tizen (Samsung) are responsible for enabling these features. Each platform offers a standard set of capabilities as well as unique functionalities.

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