#YoonYoung Yang

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Megazord by YoonYoung Yang

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I Found This Interesting. Joshua Damien Cordle

Producing technicolor through brain-like electronic devices

Structural coloration is promised to be the display technology of the future as there is no fading -- it does not use dyes -- and enables low-power displays without strong external light source. However, the disadvantage of this technique is that once a device is made, it is impossible to change its properties so the reproducible colors remain fixed. Recently, a POSTECH research team has successfully obtained vivid colors by using semiconductor chips -- not dyes -- made by mimicking the human brain structure.

POSTECH's joint research team consisting of Professor Junsuk Rho of the mechanical engineering and chemical engineering departments, Inki Kim, a mechanical engineering student in the MS/PhD integrated program, along with Professor Yoonyoung Jung and masters student Juyoung Yun of the Department of Electrical Engineering developed a technology that can freely change the structural colors using IGZO(Indium-Galium-Zinc-Oxide), a type of oxide semiconductor. IGZO is a material that is widely used not only in flexible displays but also in neuromorphic electronic devices. This is the first study that incorporates IGZO to nanoptics.

IGZO can freely control the charge concentration within a layer through the hydrogen plasma treatment process, thereby controlling the refractive index in all ranges of visible light. In addition, nanoptical simulations and experiments have confirmed that the extinction coefficient of visible light is close to zero, thus enabling the actualization of a transmittable color filter in the penetrable form that can transmit exceptionally clear colors with extremely low light loss.

The IGZO-based color filter technology developed by the research team consists of a 4-layer (Ag-IGZO-SiO2-Ag) multilayer and can transmit vivid colors using the Fabry-Perot resonance3 properties. Experiments have confirmed that as the charge concentration of IGZO layer increases, the refractive index decreases which can change the resonance properties of light that is selectively transmitted.

This design method can be applied not only to color filters for large-scale displays, but also to color printing technique of micro (11-6, millionth) or nano (10-9, billionth) sizes.

To verify this, the research team demonstrated a color printing technology that has a pixel size of one micrometer (μm, one millionth of a meter).

The results proved that the colors from the centimeter or micrometer-sized color pixels can be adjusted freely depending on the charge concentration of the IGZO layer. It was also confirmed that the structural color can be changed more reliably and quickly through changing the refractive index via charge concentration compared to other conventional all solid-state variable materials like WO3 or GdOx.

"This research is the very first application of IGZO to nanoptical structural color display technology. IGZO is the next-generation oxide semiconductor used in flexible displays and neuromorphic electronic devices," stated Professor Rho who led the research. He added, "It is anticipated that this technology, which enables filtering the transmitted light by adjusting the charge concentration, can be applied to the next-generation low-power reflective display and anti-tamper display technologies."

This study was conducted with the support from the Samsung Research Funding & Incubation Center for Future Technology.

Story Source:

Materials provided by Pohang University of Science & Technology (POSTECH). Note: Content may be edited for style and length.

Journal Reference:

Inki Kim, Juyoung Yun, Trevon Badloe, Hyuk Park, Taewon Seo, Younghwan Yang, Juhoon Kim, Yoonyoung Chung, Junsuk Rho. Structural color switching with a doped indium-gallium-zinc-oxide semiconductor. Photonics Research, 2020; 8 (9): 1409 DOI: 10.1364/PRJ.395749

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[SAMSUNG] Notebook 7 Force: A Creative Graphics Powerhouse from Studio Pivote on Vimeo.

2D Art&Animation by STUDIO PIVOTE

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NC:RESERVATIONS

UNTIL 17 NOVEMBER

Kim Jisoo, actor, as Lover (B)

UNTIL 18 NOVEMBER

Park Kyungri, Nine Muses, as the World

UNTIL 19 NOVEMBER

Jennie Kim, Black Pink

Kwon Boa (BoA), solo artist, as the Chariot

Kwon Nara, Hello Venus

UNTIL 20 NOVEMBER

Ahn Heeyeon (Hani), EXID, as the Tower

Kang Sora, actress, as Charity

Lee Jieun (IU), solo artist

EXPIRED

David Yang, model

APPLICATIONS (ACCEPTING TODAY)

Bae Yoonyoung, model, as Shin Sohee, Justice—reviewing

Kim Seokjin (Jin) of BTS as Pak Sangyeop, the Knave—reviewing

Chicha Amatayakul, actress, as Chantara Suttirat in “Bring Me Back a Dog” (Hound 3)—reviewing

Min Hyorin, actress, as Han Inna, the Magician—reviewing

Seo Kangjoon, actor, as Bong Taktak—reviewing

[nightcallrp]

NC:RESERVATIONS

UNTIL 15 NOVEMBER

David Yang, model, in “Bring Me Back a Dog” (Hound 2)

UNTIL 17 NOVEMBER

Kim Jisoo, actor, as Lover (B)

UNTIL 18 NOVEMBER

Park Kyungri, Nine Muses, as the World

UNTIL 19 NOVEMBER

Jennie Kim, Black Pink

Kwon Boa (BoA), solo artist, as the Chariot

Kwon Nara, Hello Venus

UNTIL 20 NOVEMBER

Ahn Heeyeon (Hani), EXID, as the Tower

Kang Sora, actress, as Charity

Lee Jieun (IU), solo artist

EXPIRED

Ha Jungwoo, actor

APPLICATIONS

Bae Yoonyoung, model, as Shin Sohee, Justice—reviewing

Kim Seokjin (Jin) of BTS as Pak Sangyeop, the Knave—reviewing

Chicha Amatayakul, actress, as Chantara Suttirat in “Bring Me Back a Dog” (Hound 3)—reviewing

Min Hyorin, actress, as Han Inna, the Magician—reviewing

Seo Kangjoon, actor, as Bong Taktak—reviewing

[nightcallrp]

NC:RESERVATIONS

UNTIL 15 NOVEMBER

David Yang, model, in “Bring Me Back a Dog” (Hound 2)

Seo Kangjoon, 5urprise

UNTIL 17 NOVEMBER

Kim Jisoo, actor, as Lover (B)

UNTIL 18 NOVEMBER

Park Kyungri, Nine Muses, as the World

UNTIL 19 NOVEMBER

Jennie Kim, Black Pink

Kwon Boa (BoA), solo artist, as the Chariot

Kwon Nara, Hello Venus

UNTIL 20 NOVEMBER

Ahn Heeyeon (Hani), EXID, as the Tower

Bae Yoonyoung, model, as Justice

Kang Sora, actress, as Charity

Lee Jieun (IU), solo artist

APPLICATIONS

Ha Jungwoo, actor, as Ji Youngmin, the Emperor—messaged

Kim Seokjin (Jin) of BTS as Pak Sangyeop, the Knave—received

Chicha Amatayakul, actress, as Chantara Suttirat in “Bring Me Back a Dog” (Hound 3)—received  

Min Hyorin, actress, as Han Inna, the Magician—received