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LG Develops High-Efficiency OLEDoS, Color Filter Structure That Prevents Light Leaking 

Yusuf Balogun
Yusuf Balogun
Yusuf is a law graduate and freelance journalist with a keen interest in tech reporting.

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In a bid to achieve its aims to be one of the suppliers of future Apple iPhone panels and compete with its major rival, Samsung Electronics. The South Korean panel maker LG Display, has revealed today that it has developed a high-efficiency OLED on Silicon (OLEDoS) and colour filter structure.

Recall that last week, we reported that the LTPO OLED developed by LG Display for the iPhone 14 Pro Max has entered the final review stage of Apple, with the LTPO OLED panels likely to be adopted in two weeks.

Choi Dong-Wook, a researcher at the LG display disclosed this today, pointing out that the thin-film encapsulation material, which protects OLEDs from water and oxygen, can be made 2.5 micrometres thick, enough to prevent light from leaking out and mixing different colours of light. 

To create a CoE structure (Color filter on Encap) that is directly attached to the OLEDoS thin-film encapsulation, LG Display invented a method. Choi Dong-Wook notes that this method has advantages over systems where thin-film transistors (TFTs) are linked to OLEDoS and held together with glass substrates in terms of viewing angles and preventing colour mixing.

In terms of the OLEDoS method used by SONY, the colour filter is first created separately and then merged with OLEDoS. As a result of Choi Dong-observation wook’s that this technique will reduce light transmittance, SONY will apply lens technology to increase brightness.

To further safeguard OLED materials from degradation caused by exposure to high temperatures, LG Display has also created a substance and method that can form colour filters on thin-film packages even at temperatures below 100 degrees. The OLED material is unaffected by SONY’s method, which is carried out at 230 degrees.

Additionally, Choi Dong-wook noted that the LG display used atomic layer deposition (Atomic layer deposition) to lay down the initial thin film layer before adding silicon nitride on top to create a colour filter with a 1.5-micron thickness. Also, the firm added red, green, and blue filters to white OLEDs to create the OLEDoS. By 2023, LG Display hopes to supply Apple’s first mixed reality (MR) device panels.


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