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LCD or OLED…JDI CTO “Will Seize Mobile Market though LTPS”

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JDI’s CTO Emphasizing LTPS Technology(Tokyo=OLEDNET)

JDI’s CTO Emphasizing LTPS Technology(Tokyo=OLEDNET)

Hyunjoo Kang / Reporter / jjoo@olednet.com

As a response strategy for the future smartphone display market, Japan Display (JDI) nominated LTPS evolution. This is to continue the position that JDI achieved within the LCD market through LTPS technology in the OLED market using Advanced backplane technology.

JDI’s CTO, Hiroyuki Ohshima gave a keynote speech titled Future Perspective for Small to Medium-sized Displays in FineTech Japan 2016 (April 6-8), and emphasized that they will continue developing backplane technology prowess.

Furthermore, Ohshima stressed that whether the mobile display’s frontplane is IPS LCD or OLED, the key backplane technology is LTPS. he explained that unlike LCD’s stabilized technology, OLED still has issues that need to be solved such as high uniformity and stability. However, he added that OLED is the best technology to achieve flexible display comparing the merits of LCD and OLED.

Ohshima told the attendees that LTPS is a widely used technology applied to both LCD and OLED, has high electron mobility compared to other TFT technology, and high resolution, low power, etc. are possible. From 2015, JDI has been using 60 Hz Gen1 LTPS technology, and expected to use 30 Hz Gen2 Advanced LTPS from 2016, and Gen3 with 15 – 5 Hz from 2017. The evolved technology can greatly reduce energy consumption compared to the previous versions of the technology.

Furthermore, Ohshima is planning to respond to the small to medium-sized display market by developing in-cell touch, low power technology, etc. He added that small to medium-sized display, represented by smartphone, requires the integration of developed technology

FineTech Japan 2016 (April 6-8) is a display technology related exhibition held in Tokyo Big Sight. The 26th annual event is participated by approximately 260 companies including Samsung Display, BOE, and Japan Display.

[2015 OLED Evaluation Seminar] Oxide TFT Technology that 2015 should Spotlight

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By Hyun Jun Jang

 

During the 2015 OLED Evaluation Seminar (December 4) hosted by UBI Research, Professor Jin-Seong Park of Hanyang University gave a presentation titled OLED Oxide TFT Technology Trend, discussing oxide TFT, related industry, and technological issues as well as TFT technology that should receive the spotlight in 2016.

 

Oxide TFT has an advantage of high mobility and large area uniformity compared to a-Si TFT. As such, it is being more applied to large area OLED panel and used in LG Display’s OLED TV.

 

Park revealed that there are mainly 4 issues regarding oxide TFT and led with the reliability issue. Oxide TFT is essentially in amorphous state but when crystalized, the density and crystallizability increase; as oxygen does not move away and stay in place, defects occur less and reliability is high. Japan’s SEL and Sharp published CAAC (C-Axis Aligned Crystal) structure related oxide TFT paper, and Cornell University produced CAAC oxide TFT by increasing the substrate temperature and adjusting oxygen’s partial pressure.

 

The second issue is composition ratio. Park reported that composition ratio is the most closely related characteristic to TFT’s mobility. He revealed that recently research is being carried out centering around IGZO (indium gallium zinc oxide), but also oxide TFT research with different composition ratio is continually published. For example, ITZO (indium tin zinc oxide)’s mobility has been reported to reach 30cm/Vsec, and BOE is working on the related research. Research results, which showed increased mobility and reliability for IGZTO, which is IZTO with G added, was published, as well as ZnON (zinc oxide nitride) TFT’s 100cm/Vsec mobility. BOE demonstrated ZnO TFT applied 14.1inch AMOLED.

 

The third issue is the device structure. Park explained that efficiency can increase when top gate structure is used to oxide TFT as parasitic capacitor is not needed, but that the process is difficult. However, Park reported that JOLED revealed when self-alignment is used the number of masks used can be reduced and increases performance. This structure is applied to OLED TV by LG Display.

 

Lastly, Park gave the safety of device as the last issue. Oxide TFT can exhibit degradation effects from light, oxygen, hydrogen, and moisture. Park reported that hydrogen particularly has great effect on the safety. He explained that although the current prevailing OLED TFT is LTPS, as the panel becomes larger there will be technological competition between oxide and LTPS. Reporting that TFT which is cost efficient and shows high performance in diverse factors such as resolution will dominate the market, Park concluded his presentation.

 

 

 

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