Following LGD/JDI, Samsung Display also began mass production of LTPO OLED
According to Korean media reports, following LGD and JDI, Samsung Display has also started mass production of LTPOOLED and applied it to GalaxyWatchActive2.
LTPO is a low-power OLED display technology that Apple introduced to AppleWatchSeries4 for the first time last year. The LGE2 line specifically produces LTPOOLEDs for the AppleWatch Series4. Apple AppleWatchSeries5 also introduced JDILTPOOLED this year.
Samsung Display is mass producing LTPOOLEDs with its own technology. Samsung Display's A2 plant has begun mass production of LTPOOLED for GalaxyWatchActive2. Samsung Display has a capacity of 50,000 flexible OLEDs per month at the A2 plant, with a monthly capacity of 144,00 rigid OLEDs.
The LTPOTFT has a lower driving power than the LTPSTFT. LTPS requires 60Hz for still images, but LTPO can be reduced to 1Hz, and drive power is greatly reduced.
The display power consumption is divided into drive power and luminous power. The LTPO converts some of the transistors into oxides with less leakage current, allowing the capacitor voltage (charge) to remain for one second to drive 1 Hz. LTPS has a larger leakage current, even if it drives a still pixel, 60 Hz; otherwise, the brightness will be greatly reduced, while LTPO will not.
Manufacturing LTPO requires more layers and steps than LTPS. An LTPS transistor is first fabricated, and then a metal oxide (IGZO) is deposited thereon by sputtering to form an oxide transistor. Since more layers are required than before, the number of exposures is increased, the yield is lowered, and the cost is increased.
LTPO was originally applied to smart watches. The efficiency of LTPO is greatly demonstrated in smart watches. Since the black area on the screen is wider, the light power is lower. In LTPS, the ratio of drive power to illuminating power is approximately 6:4. The LTPO reduces the existing drive power by a factor of three, resulting in a 40% reduction in overall power consumption.
Apple has many patents related to LTPOTFT and won the annual display award at SID2019. Apple is trying to extend the LTPO application to the iPhone. However, the luminous power of the smartphone accounts for about 80% of the total power, and the luminous power is significantly larger than the driving power. Even if the driving power is reduced, the total power consumption is reduced, but the effect is not obvious. This is because people use smart phones differently from smart watches. For example, people may watch videos on their mobile phones for a long time, and the low power consumption advantage of LTPO cannot be realized.
If LTPO is to be used in applications such as mobile phone displays, the difficulty of production will increase and the price will increase. The display size of a smart watch is less than 2 inches, but the smartphone display is about 6 inches. By balancing the power reduction effect with increased production costs, higher process technologies associated with LTPO can be applied to actual products.
LTPO is a low-power OLED display technology that Apple introduced to AppleWatchSeries4 for the first time last year. The LGE2 line specifically produces LTPOOLEDs for the AppleWatch Series4. Apple AppleWatchSeries5 also introduced JDILTPOOLED this year.
Samsung Display is mass producing LTPOOLEDs with its own technology. Samsung Display's A2 plant has begun mass production of LTPOOLED for GalaxyWatchActive2. Samsung Display has a capacity of 50,000 flexible OLEDs per month at the A2 plant, with a monthly capacity of 144,00 rigid OLEDs.
The LTPOTFT has a lower driving power than the LTPSTFT. LTPS requires 60Hz for still images, but LTPO can be reduced to 1Hz, and drive power is greatly reduced.
The display power consumption is divided into drive power and luminous power. The LTPO converts some of the transistors into oxides with less leakage current, allowing the capacitor voltage (charge) to remain for one second to drive 1 Hz. LTPS has a larger leakage current, even if it drives a still pixel, 60 Hz; otherwise, the brightness will be greatly reduced, while LTPO will not.
Manufacturing LTPO requires more layers and steps than LTPS. An LTPS transistor is first fabricated, and then a metal oxide (IGZO) is deposited thereon by sputtering to form an oxide transistor. Since more layers are required than before, the number of exposures is increased, the yield is lowered, and the cost is increased.
LTPO was originally applied to smart watches. The efficiency of LTPO is greatly demonstrated in smart watches. Since the black area on the screen is wider, the light power is lower. In LTPS, the ratio of drive power to illuminating power is approximately 6:4. The LTPO reduces the existing drive power by a factor of three, resulting in a 40% reduction in overall power consumption.
Apple has many patents related to LTPOTFT and won the annual display award at SID2019. Apple is trying to extend the LTPO application to the iPhone. However, the luminous power of the smartphone accounts for about 80% of the total power, and the luminous power is significantly larger than the driving power. Even if the driving power is reduced, the total power consumption is reduced, but the effect is not obvious. This is because people use smart phones differently from smart watches. For example, people may watch videos on their mobile phones for a long time, and the low power consumption advantage of LTPO cannot be realized.
If LTPO is to be used in applications such as mobile phone displays, the difficulty of production will increase and the price will increase. The display size of a smart watch is less than 2 inches, but the smartphone display is about 6 inches. By balancing the power reduction effect with increased production costs, higher process technologies associated with LTPO can be applied to actual products.