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OLED vs LED vs QLED

Digital technology has dramatically accelerated the development of various technologies in all areas, including the consumer electronics segment. Only in the last 10 years, companies have developed and implemented a huge number of various innovations, radically expanding the functionality of almost any household appliances. Modern robot vacuum cleaners, multi cookers, coffee machines, etc fully comply with this trend. Of course, the high-tech TV segment is no exception. HDR technology, including HDR10 +, HLG and Dolby Vision standards with support for 10 and 12-bit color depth, HDMI 2.1 standard with support for 48 Gbps, 4K and even 8K resolution, HFR (high frame rate) format, etc beautifully illustrate this trend. But the support of these technologies demanded a dramatic expansion of matrix capabilities. Therefore, most leaders pay a lot of attention to the development and improvement of matrix, which provide the image formation on the TV screen. As a result, fierce competition stimulates almost parallel development of several technologies. As a consequence, today the market offers a large number of models in each price segment with different matrices, but with approximately the same price / quality ratio. Of course, this situation is convenient for consumers, but often makes it difficult to choose. Therefore, even a simplified classification can partially solve this problem. As known, modern TVs use LED LCD, OLED and QLED technology to form an image on the screen. Of course, the development of efficient matrices and powerful modern video processors has allowed companies to dramatically increase the screen resolution, frame rate and color gamut, which directly affect the image quality.

LED LCD

Today this type is the most common. LCD (liquid crystal display) includes several layers of polarizing material with a liquid crystal solution between them, which regulates the passage of light. Almost all modern LCD matrix use LED (light-emitting diode) backlight. Thus, the LED LCD model includes a liquid crystal display with LED backlight. The light from the LEDs passes through the LCD panel, the surface of which is covered with integrated RGB pixels.

Many often call them LED screens. The pixel filters form a color image with a certain level of brightness. Imperfect black level is their main disadvantage.

As known, the contrast is equal to the ratio of the maximum levels of white and black, i.e. the brightness ratio at the brightest point of the screen to the darkest point. In turn, the contrast affects image detail and its range. Thus, low contrast depending on brightness provides high detail only for dark frame areas, but with blurred gradations of light fragments, or for light areas, but without gradations in the darkened area of the frame. Of course, this significantly reduces image quality. But companies are constantly improving technology, solving this problem. For example, FALD (Full Array Local Dimming) backlighting provides brightness control in the desired parts of the screen. This technology significantly improves the brightness and contrast of the image.

HDR technology solves this problem by transmitting dynamic metadata with information about the required brightness of each frame. Today it provides maximum image quality.

However, imperfect black initiated the development of OLED matrices that provide perfect black due to the lack of backlight.

OLED

This technology uses organic light-emitting diodes. In fact, each cell of the OLED matrix is a separate light source with individual brightness adjustment.

Of course, such a natural local backlight provides the most effective control of the black level and contrast. As known, LG released the first 4K OLED displays in 2014. Soon, Panasonic, Sony and Samsung also concentrated their efforts in this direction. Then, LG developed the WRGB technology with an additional white sub-pixel, which increased peak brightness and improved the playback of midtones and shades.

Features OLED technology: - very high contrast. For example, the 4K matrix contains about 820 million local dimming zones. Their provide an ideal contrast level due to a very deep black; - uniform illumination of the entire screen surface; - very wide viewing angles provide excellent color rendering and brightness level for any viewing angle; - a relatively short service life of the blue subpixel. The average service life is about 7000 hours or 2-3 years with an average intensity of work. Then, It begins to distort the color rendering due to degradation; - very high price. However, in 2018, LG for the first time offered 4K OLED B8 PLA at a relatively low price. Today, the cost of a 55-inch model is less than $ 1,500. In general, OLED provides significantly better quality than LCD.

QLED and Nano Cell

QLED uses LEDs on so-called quantum dots. Of course, technology is not related to quantum theory, and the name is due to marketing considerations. Today, Samsung uses the QLED term as a commercial name for its models. This technology uses an additional quantum dot-based nanofilter between the LCD display and the LED panel.

This film significantly improves brightness control, providing brighter and more saturated colors. In fact, the QLED display is improved version of LED LCD technology. In 2016, LG offered its own technology based on quantum dots, which was called the Nano Cell.

With some reservations, it can be considered an analogue of Samsung's QLED. The pixels of such matrices contain nanocrystals that glow and are painted in different colors as the electric current passes through them. According to the developers, it provides a more accurate color rendering even in comparison with the OLED technology, because each point forms its own color without mixing RGB colors.

Testing Samsung Q7F (QLED), LG B6 (OLED) and Samsung KS8000 (LED LCD)

Contrast Black level characterizes the minimum glow of the screen, the white level - the maximum. Contrast in this case corresponds to the ratio of black level to white level.

QLED uses a VA panel without local dimming. OLED provides absolutely black with infinite contrast. The Samsung KS8000 has one of the best contrast levels among similar LED LCD models. But this value can vary greatly depending on the manufacturer, the type of panel (VA or IPS) and the presence of local dimming. Of course, OLED wins this test. Color volume This value characterizes the accuracy of shades reproduction, which depends on the color gamut and brightness in three-dimensional space. As known, the color gamut characterizes the maximum number of color shades that the matrix can reproduce. Peak brightness characterizes the highest possible screen brightness level. Accordingly, the color gamut and brightness directly affect the color volume.

The built-in multi-HDR and brighter color rendering levels provide a 4% advantage for QLED compared to OLED. In addition, Verband Deutscher Elektrotechniker (VDE) confirms 100% color accuracy for this model. In turn, OLED slightly surpasses even one of the best LED LCD. Thus, QLED outperforms the competition.

Conclusion

Thus, today OLED-models provide higher quality of a color rendering, clearness and contrast of the image. But today they are quite expensive and have a shorter service life. LED LCDs have a very good value for money due to their relatively low cost and are available in a wide range. QLED models today occupy an intermediate position. At the Invision Technology Showcase 2019, LG introduced new 4K OLED UHD C9 with AI image optimisation processor. LG product training manager Dean Little suggested to compare the image quality of the OLED C9 vs LG NanoCell 4K LED model with a wide viewing angle and high colour accuracy. This video offers his comments. Read the full article

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What are some air conditioner problems and solutions?

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Low outside temperature

Low coolant levels Blower motor problems Stuck contractor ALSO, READ – AIR CONDITIONING MAINTENANCE: TIPS TO MAKE YOUR AC READY FOR SUMMER 4. AC REFRIGERANT LEAK When the coolant in your air conditioner starts leaking, the temperature will vary, and the unit will not perform accurately. Refrigerant leaks can result in:

Low efficiency High power consumption Coil freezing Damaged compressor Uneven cooling Inspect your air conditioner regularly for any refrigerant leaks.

5. AIR CONDITIONER MAKING NOISES

An air conditioner can make different sounds depending on the type of problem. There are different reasons why your air conditioner is producing a variety of sounds:

A refrigerant leak can produce a hissing sound. If you hear clicking sounds when you turn on and off your AC, it might be a relay problem. Thumping, rattling, or banging noises mean there is a problem with a blower or motor assembly.

The compressor or fan motor produces a screeching noise. Faulty electrical components produce a buzzing sound. 6. FROZEN EVAPORATOR COIL The evaporator coil freezes when your air conditioner does not receive sufficient air needed for operation. A frozen evaporator coil can make your AC freeze up and stop working. Blocked vents and ducts, dirty filters, or a faulty fan can cause insufficient airflow in the system. A clean air filter is important to maximize airflow and indoor air quality.

7. ELECTRIC CONTROL FAILURE When you frequently turn on and off your air conditioner, the fan controls and compressor can wear out. The condenser fan motor, the compressor, and the blower motor make an electrical connection to start the unit. A connection problem can prevent the motor and compressor from turning on. You should check the electrical connections to determine the issue.

8. AIR CONDITIONER LEAKING WATER OUTSIDE Water leaking outside from your AC on a hot or humid day, especially when the unit is running, is considered normal. It is also normal if the water leakage occurs outside in cool weather at a temperature of 60 degrees or less, as the unit can freeze up and leak water when it melts. Other reasons for your air conditioner to leak water outside, include:

Dirty air filters Improper installation Blocked drain pipe Low coolant levels Broken condensate pan ALSO, READ – HVAC TUNE-UP CHECKLIST: WHAT DOES IT CONSIST OF? 9. DRAINAGE PROBLEM The drain pipeline can also become clogged with dust, algae, and dirt. If water does not drain properly, mold, fungus, and mildew can develop. Also, gasses and bad odors can filter into your home. To prevent this, make sure your drain line is regularly maintained, cleaned, and inspected. Air conditioners that are not mounted level may not drain properly.

10. SENSOR PROBLEM The air conditioner contains a thermostat sensor, located near the evaporator coil. The thermostat measures the air temperature in the evaporating coil and adjusts the cooling based on the condition of the room. If the sensor is forced out of position, the air conditioner can randomly turn on and off or cycle constantly. The sensor should be placed near the evaporator coil without touching each other. Adjust the sensor by bending the wire that holds it in position.

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lg ledlcd service center in Secunderabad

We maintain the latest lg Brand Television in Hyderabad. You can call us from any place in the city. We service at your doorstep. We save your time and money should your big screen TV needs service. lg ledlcd service center in Secunderabad repair professionals have been fully qualified by TV companies to guarantee that you get the most pleasant service. We repair your LCD, LED, PLASMA TV right in your home, or business location at movable rates and at your convenient time. LG best service center is Particular to handle and service TV of all present models. We must prepare one of the most reliable and advanced TV Repair Company in Hyderabad. These Service Center Having 10 Years of practice in repairing T.V requests and giving quick service.

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lg ledlcd service center in Secunderabad

LG best service center is Particular to handle and service TV of all present models. We must prepare one of the most reliable and advanced TV Repair Company in Hyderabad. These Service Center Having 10 Years of practice in repairing T.V requests and giving quick service. lg ledlcd service center in Secunderabad repair professionals have been fully qualified by TV companies to guarantee that you get the most pleasant service. We maintain the latest lg Brand Television in Hyderabad. You can call us from any place in the city. We service at your doorstep. We save your time and money should your big screen TV needs service. We repair your LCD, LED, PLASMA TV right in your home, or business location at movable rates and at your convenient time.

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lg ledlcd service center in Secunderabad

lg ledlcd service center in Secunderabad has more than the best quality service engineers to repair, service, and to fix any kind of problems in your Lg TV Products. The professionals are ready to provide 24 hours services to the customers and they can work on all major brands. If you need Lg TV repair and service feel free to reach or the leading lg ledlcd service center in Secunderabad. Our Service Engineers use the best quality materials and products to ensure an extended-lasting and untroubled installation after servicing. Our service technicians or consultants will reach you at the earliest time. Whatever the condition don’t worry our technicians are ready to repair all your electronic appliances.

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lg ledlcd service center in Secunderabad

The technicians are ready to provide 24 hours services to the customers and they can work on all major brands. Whatever the condition don’t worry our technicians are ready to repair all your electronic appliances. If you need of Lg TV repair and service feel free to reach or the leading Lg Service center in Hyderabad. lg ledlcd service center in Secunderabad have more than the best quality service engineers to repair, service and to fix any kind of problems in your Lg TV Products. Our Service Engineers use the best quality materials and products to ensure an extended lasting and untroubled installation after servicing. Our service technicians or consultants will reach you at the earliest time.

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Welcome To Trusted & Experienced TV Repair Experts

Srikara Electronics is one stop service TV center for LED TV, LCD TV, OLED TV and QLED TV for Multi brands available in market; we are expert in Chip level service and Panel Bounding and repair service for all latest TV brands and models. Television plays a very important role in our day-to-day life. It is really hard to imagine our life without Television, as it is considered as a main source of entertainment. When you face a problem of a distorted image, or a very bad picture quality, it means your TV needs repair. We at Srikara Electronics, Hyderabad perform fast and professional TV repair in Hyderabad at your convenience. Our fully trained engineers have experience repairing LED TVs, LCD TVs, OLED TV and QLED TV.

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The technicians are ready to provide 24 hours services to the customers and they can work on all major brands. Whatever the condition don’t worry our technicians are ready to repair all your electronic appliances. If you need of Lg TV repair and service feel free to reach or the leading Lg Service center in Hyderabad. lg ledlcd service center in Secunderabad            have more than the best quality service engineers to repair, service and to fix any kind of problems in your Lg TV Products. Our Service Engineers use the best quality materials and products to ensure an extended lasting and untroubled installation after servicing. Our service technicians or consultants will reach you at the earliest time.

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We have experienced professionals and they are willing to repair all types of TV errors like display, sound, and motherboard, etc. Our service center produces all types of TV services like LED LCD and plasma TV repair services in Hyderabad. lg ledlcd service center in Secunderabad, whenever you avail of their unique service, the nearby service center will send directly their technician and experts in order to attend your complaint related to LG TV products. Most of their services come with affordable and honest service charges for its esteemed present and likely customers in the market with a lot of satisfaction.          

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lg ledlcd service center in Secunderabad

We have experienced professionals and they are willing to repair all types of TV issues like display, sound, and motherboard, etc. Our service center produces all types of TV services like LED LCD and plasma TV repair services in Hyderabad. lg ledlcd service center in Secunderabad, whenever you avail of their unique service, the nearby service center will send directly their technician and experts in order to attend your complaint related to LG TV products. Most of their services come with affordable and honest service charges for its esteemed present and likely customers in the market with a lot of satisfaction.          

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LG UV340C 43UV340C 42.5" 2160p LED-LCD TV - 16:9 - 4K UHDTV - TAA Compliant | Get Upto 50% Discount

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lg ledlcd service center in Secunderabad

Our service center produces all types of TV services like LED LCD and plasma TV repair services in Hyderabad. We have experienced professionals and they are willing to repair all types of TV issues like display, sound, and motherboard, etc. lg ledlcd service center in Secunderabad, whenever you avail of their unique service, the nearby service center will send directly their technician and experts in order to attend your complaint related to LG TV products. Most of their services come with affordable and honest service charges for its esteemed present and likely customers in the market with a lot of satisfaction.          

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lg ledlcd service center in Secunderabad

LG TV technicians are committed to maintaining the manufacturer’s high quality of engineering standards. We provide lg tv repairs and services at the most reasonable prices. We take care of your LG tv repair needs in a timely and cost-effective way. lg ledlcd service center in Secunderabad will advise you if it is time for replacement, otherwise, we can fix it. We are just a phone call away, this is Door Step Service center in Hyderabad. Our aim to provide the same day repair services has helped us earn a good reputation among our clients and customers. For LG tv repairs, the cost of repair is often less expensive than replacement.      

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lg ledlcd service center in Secunderabad

LG tv repairs and services at the most reasonable prices. We take care of your LG tv repair needs in a timely and cost-effective way. Our LG tv technician are committed to maintaining the manufacturer’s high quality of engineering standards. lg ledlcd service center in Secunderabad will advise you if it is time for replacement, otherwise, we can fix it. We are just a phone call away, this is Door Step Service center in Hyderabad. Our aim to provide the same day repair services has helped us earn a good reputation among our clients and customers. For LG tv repairs, the cost of repair is often less expensive than replacement.

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lg ledlcd service center in Secunderabad

We take care of your LG tv repair needs in a timely and cost-effective way. Our LG tv technician are committed to maintaining the manufacturer’s high quality of engineering standards. For LG tv repairs, the cost of repair is often less expensive than replacement. lg ledlcd service center in Secunderabad will advise you if it is time for replacement, otherwise, we can fix it. LG tv repairs and services at the most reasonable prices. Our aim to provide the same day repair services has helped us earn a good reputation among our clients and customers. We are just a phone call away, this is Door Step Service center in Hyderabad.