Gas Is A Key Material For Display Manufacturing

- Jul 28, 2018 -

Technology trend

TFT-LCD (Thin Film Transistor Liquid Crystal Display) is a basic technology. The large screen uses MO/white OLED (Organic Light Emitting Diode). Small and medium screens use LTPS / AMOLED. The difficulty faced by OLEDs is the effect of <1 micron particles on yield, and the cost is much higher than amorphous silicon (a-Si) due to the increased masking step. In addition, moisture in the OLED step has an effect on production yield.

The mobility limit (Figure 2) is one of the main reasons for switching to MO and LTPS, with the goal of achieving a better viewing experience with higher resolution.

The challenge for MO is how to avoid oxidation caused by IGZO metallization/moisture after the OLED step, which will result in a decrease in yield. A large amount of N2O (nitrous oxide) is used in the manufacturing process, which means that it may be necessary to consider changing the traditional supply mode.


Although AMLCD displays are still the mainstream in the market, AMOLED displays are growing rapidly. About 25% of smartphones currently use AMOLED displays, which is expected to reach about 40% by 2021. OLED TVs also grew rapidly, with year-on-year growth rates reaching double digits. According to IHS data, in the next five years, AMOLED display panel revenue is expected to grow at a compound annual growth rate (CAGR) of 18.9%, while AMLCD display revenue will be 2.8% at the same time CAGR, and all display revenues will be CAGR of 2.5. %. With the rapid growth of AMOLED displays, display manufacturers have accelerated their investment in AMOLED manufacturing equipment.