Improve color gamut by 30% Quantum dot backlight boosts LCD picture quality

    Quantum dots have luminescent properties. When illuminated by a blue LED backlight, the quantum dots in the quantum dot film (QDEF) will generate red light (R) and green light (G), which will be mixed with some of the blue light (B) that passes through the film to obtain white light, thereby improving the luminous effect of the entire LCD backlight. On the one hand, this technology can effectively improve the color saturation of the LCD. Compared with traditional high color gamut technology, quantum dot technology will be able to increase the LCD color gamut by 30% without increasing the thickness of the CF film.

    On the other hand, it can also increase the backlight brightness and save energy. Therefore, Σintell believes that quantum dot technology will effectively solve the dilemma of high color gamut but low brightness caused by traditional methods, while high brightness requires increasing the number of LED chips, which increases energy consumption and cost. It will undoubtedly provide the best solution for LCD products to compete with OLED in terms of high color gamut.

    At present, the research and development of quantum dot backlight technology has gradually matured and is expected to be introduced to the consumer market within this year. It is understood that Samsung Electronics, LGE and TCL all exhibited LCD TVs using quantum dot backlight technology for the first time at the Berlin International Consumer Electronics Show (IFA) which opened on September 5. According to a survey by Σintell, global first-tier brand manufacturers are actively developing large-size QD LCD TV products. Among them, Samsung Electronics will mass-produce QD LCD TVs in the first quarter of next year, with SDC providing open cells. The first batch of products will mainly be 55” and 65” in size and will be positioned in the ultra-high-end market.

    TCL will use Huaxing 55” UHD panel and 3M QDEF, with a color gamut of 105%, and plans to mass produce it by the end of 2014. LGE has also been working with QD Vision to develop quantum dot backlight technology and plans to launch QD LCD TVs, but its product strategy in 2015 will still focus on promoting OLED products. Sony also plans to launch QD LCD TV products larger than 55’.

    Since quantum dot films have nano-film characteristics and very small particles, the flatness of the film and the uniformity of the particles are required to be high in the production process, and the production yield is low, which results in the current QD LCD module cost being more than 30% higher than that of ordinary LCD modules. Therefore, Σintell believes that QD LCD TVs will be positioned mainly in the large-size ultra-high-end market when they are first launched, and it may take a long time for the market to be popularized. In the future, the improvement of film production yield and the improvement of LCD backlight structure will be the key factors that determine the cost reduction.

    PConline Home Appliances Channel Comment: The TV industry has evolved from 3D to smart, and then to 4K, and is now working hard to develop wide color gamut technology. From the context of this industry's hot technologies, we can understand that after experiencing the two additional function hotspots of cool and smart (which actually did not receive good market recognition), the industry has gradually returned to rationality and began to refocus technology research and development on picture quality. This is a welcome change.

Manufacturers demonstrate color enhancement technology of quantum dot backlight

    The maturity of 4K technology can be said to be the inevitable result of the trend of LCD TVs becoming larger in screen size. After the resolution has been improved, how to further improve the picture quality has become the focus of attention. Against the background of Japanese and Korean manufacturers gradually clearing up their efforts to market OLED, the upgrade and evolution of LCD has been picked up by the industry again. This is not because OLED technology is inferior to LCD, but that LCD still has broad evolutionary prospects in its mature stage, and it is a compromise route when the market has low expectations for TV prices.

    After improving the color gamut and color saturation, the picture quality parameters of LCD are not far behind those of OLED. OLED only has the advantages of being flexible, low energy consumption, and thin. However, if LCD technology continues to improve, it is hard to say how much space and time is left for OLED in the market.

Quantum dot backlight can also bring more accurate color display