Researchers develop transparent LED electronic displays based on an active matrix

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[Courtesy of KOPTI]

SEOUL — A South Korean research organization has developed a transparent LED electronic display that can reduce power consumption by more than 50 percent and enable free brightness control using active-matrix technology.

Active matrix is ​​a type of addressing scheme used in flat panel displays. When switching individual elements, each pixel is attached to a transistor and capacitor actively maintaining the state of the pixel while other pixels are addressed, unlike older passive matrix technology where each pixel must maintaining its state passively, without being driven by circuits.

The application of active matrix technology to transparent light-emitting diode (LED) electronic boards can be extended to various fields as it is effective in reducing power consumption and improving image quality, according to Korea Photonics Technology Institute (KOPTI), a research institute specializing in the field of photonic technology.

Transparent LED screens rotate the line pixels sequentially because they must visually hide the opaque wires on the screen. Pixels flash periodically, causing flashing and flickering which can be resolved with the fast high current supply. There is also a technical limitation to increasing screen sizes and pixel density.

For transparent LED displays based on active matrix technology, the research organization applied transparent modules and gateway technology that wirelessly extend the connection between drive units and video playback units to enable high resolution.

The minimum size of light source packages in existing electronic LED displays using wire bond technology is 2mm x 2mm. The size of KOPTI’s light source package based on flip chips is 1.2mm × 1.2mm, enabling high resolution.

“With the advent of mini-LED and micro-LED technologies, the demand for various high-resolution transparent electronic displays is increasing, but due to the lack of development technology at home, it is highly dependent on imports,” said Kim Jung-hyun. , a senior researcher in charge of KOPTI’s Micro-LED Display Research Center. “We hope that the technology developed this time will be an opportunity to raise the competitiveness of home LED displays to a higher level.”

MicroLED is an emerging technology that uses microscopic LEDs. Compared to OLED displays, microLED displays have higher brightness and a wider color gamut. Additionally, the new LED technology does not have the luminance decay issues commonly seen in OLED displays.

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