|LGD may use a blue TADF in their televisions next year. Assuming better performance than flourescent blue, this is positive short-term but definitely negative for the long-term.|
OLED TV gets stronger ... LG Display, introduction of new materials
2017.07.05 08:27:08 / ??? email@example.com
[Electronic Components Specialist Media Insight Semicon]
LG Display introduces Thermally Activated Delayed Fluorescence (TADF) material through the system to improve the performance of large organic light emitting diodes (OLEDs).
As soon as possible, it will be applied to products to be introduced next year. It can improve the efficiency such as power consumption and lifetime while increasing the performance of white OLED (WOLED). It is expected that utilization will be further diversified as it can be used in the inkjet (solubile process) method in the medium to long term.
According to the industry on May 5, LG Display will replace blue (blue) material used in WOLED with TADF made by Soriah (Cynora). "It is necessary to introduce TADF in order to increase OLED efficiency," a LG Display official said. "We plan to expand WOLED not only into large-format but also small- and medium-sized products."
Unlike liquid crystal display devices (LCDs), which require a backlight unit (BLU), OLEDs have self-luminous characteristics that emit light by themselves. Electrons starting from the positive electrode (+) and the negative electrode (-) pass through the hole injection layer (HIL), the hole transport layer (HTL), the electron transport layer (ETL) and the electron injection layer (EIL) Finally, it makes light on the host.
In the case of WOLED, only the white (W), not the three primary colors of red (R), green (G) and blue (B), is made and the light is emitted through the color filter (CF). White is made by mixing yellow (Y), green and blue. Similarly, yellow is the result of red and green.
The key is blue. OLED light emitting materials are classified into fluorescence and phosphorescence depending on their characteristics. Phosphorescent materials have a four times higher efficiency in converting electrical energy to light than fluorescent materials. Red and green phosphorescent materials have been developed, but blue is still. The blue TADF material supplied by SaNoRa is characterized by improved lifetime and luminous efficiency.
LG Display has almost completed research and development (R & D) on top emission rather than bottom emission for ultra-high definition (UHD) resolution and transparent flexibility. In order to realize high resolution in OLED panels, it is difficult to obtain an aperture ratio (ratio of the area where the actual light can be emitted). OLEDs using self-luminous elements are relatively easy to secure the aperture ratio compared to LCDs, but there is a difficulty in shortening the device life when the current is increased to compensate for brightness.
The industry expert said, "LG Display believes that small OLEDs used in virtual reality (VR) can also be implemented as WOLED." "We will also use the SOLUBLE process, but the improvement of WOLED will be steady in terms of efficiency and utilization." Explained.