The revolution of backplane technology

High Mobility Oxide

Innovative technology integrating all characteristics of current backplane technology

HMO (High Mobility Oxide) technology can provide a backplane suitable for low power consumption devices, just like conventional oxide semiconductor TFTs, as it has a very small off-leak current.
Conventional oxides had the drawback of having a low on-current, making it difficult to deploy high-performance devices such as OLED or µLED combinations, VR products, and wearable products. However, with HMO technology, which can carry an on-current equivalent to LTPS, it is possible to deploy these products.
Unlike LTPS, which could only be expanded up to Gen.6 generation (1500_1800mm), this technology can be applied to glass sizes of Gen.8 (2200_2500mm) or more, just like a-Si, allowing for the production of even larger displays at a lower cost.

01 From amorphous to poly-crystalline

One of the features of this HMO technology is that it has achieved technological innovation in Poly-OS (Poly Crystalline Oxide Semiconductor) by using a new oxide semiconductor material developed by Idemitsu Kosan Co., Ltd. This is in contrast to the previous oxide, TAOS (Transparent Amorphous Oxide Semiconductor), which used amorphous. Similar to the relationship between conventional amorphous Si (a-Si) and low-temperature polycrystalline silicon (LTPS), using Poly-OS as the active layer material allows us to achieve higher mobility and reliability than conventional oxide semiconductor TFTs, including IGZO

02 Realization of low power consumption and high performance

The field-effect mobility, one of the parameters indicating the performance of TFTs, shows a value of 32cm2/Vs in HMO, which is more than double that of conventional oxide semiconductors. Furthermore, by combining it with JDI's process technology, this field-effect mobility has increased to a very large value exceeding 50cm2/Vs. As a result, it is possible to flow a current greater than LTPS in the circuit, and also to drive it with a smaller voltage when flowing the same current

03 Expecting synergistic effects with new technology

As HMO technology is a backplane technology that drives displays, it can be expected to work well with various application products, not just OLEDs. Not only can we expect synergistic effects with JDI's new display technologies such as eLEAP, ultra-high definition VR, and transparent display (Realclear), but its features can also be utilized in application products other than displays, such as sensors and antennas

Innovative Improvement in Display Performance Across Various Fields

-Characteristic Data of This New Technology -

Displays are provided as products with the name of the front plane, such as LCD or OLED, at the forefront, but underneath the front plane is a backplane, which uses Thin Film Transistors (TFTs). The backplane plays a role similar to that of the human body’s heart/blood vessels/nerves in controlling the display, and is a fundamental part in any product. HMO is one such backplane technology.

Displays have many pixels arranged in parallel, and it's the TFTs in the backplane that send electrical signals to each individual pixel to determine what color to display and how bright to make it. Controlling these signals requires smooth switching of ON/OFF, the ability to easily conduct current with minimal energy, and the capacity to fully shut down. This is an indispensable technology that supports the display behind the scenes.

Technical Concept

Polycrystalline oxide semiconductors are more prone to oxygen defects than regular oxide semiconductors, which has been a challenge due to the high variability in the electrical characteristics of TFTs with conventional technology. Here, by combining various forms of expertise in TFT manufacturing processes that JDI has cultivated over its long history and a new material developed by Idemitsu Kosan Co., Ltd., we have successfully produced HMO displays on a G6 (1500x1850mm) size glass substrate on the mass production line at the Mobara factory, realizing a backplane with less variability and high mobility. 

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