Samsung Display reportedly has started to develop a thinner and potentially flexible quantum dot (QD) – organic light-emitting diode (OLED) TV panel.

According to information from South Korean technology trade publication The Elec on Tuesday, the thinner QD-OLED panel could conceivably be developed into a rollable screen, similar to LG’s Rollable W-OLED model.

The report said the R&D project aims to reduce the number of glass substrates used in QD-OLED panels from the two used now, to one.

Samsung Display reportedly uses two glass substrates — one for thin-film transistors (TFT) and one for Red and Green quantum dot converters — in its current QD-OLED panels. The panels are being sold this year in 4K QD-OLED TVs from Sony and Samsung Electronics. Samsung Electronics has chosen to call its application of the technology Quantum HDR OLED TV.

The technology currently uses a glass substrate for the TFTs (TFT Anode) and transparent cathode Blue OLED light emitting layer sandwiched with a separate QD color conversion layer.

The goal of the new development project would involve replacing the glass substrate QD color conversion layer by inkjet printing the Red and Green quantum dot nano particles on top of the blue OLED/TFT substrate.

The technology would continue to encapsulate the organic OLED compounds as well as the Red and Green quantum dots to protect against exposure to air and moisture, the report said.

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In addition to producing a thinner panel, the end result is expected to help Samsung Display also reduce materials and material costs, while simplifying the production process.

The current QD-OLED manufacturing process is generally assumed to be more complex than mass production of White-OLED panels manufactured by LG Display (and in China in partnership with Skyworth).

By getting the panel down to one substrate, it’s conceivable that Samsung Display could create a flexible panel that could function as a “rollable display.”

LG’s currently available signature Rollable OLED TV uses only one glass substrate and a layered stack consisting of a white OLED emitted light, TFTs and Red, Green and Blue color filters. The arrangement is called bottom emission.

Samsung Display’s process, called top emission, transmits light in the opposite direction.

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By Greg Tarr

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