Mitsubishi Chemical and Pioneer Develops Bluelight-less OLED Lighting

Japan’s Mitsubishi Chemical and Pioneer announced their success in developing the first bluelight-less OLED lighting module. The two companies produced this module through a wet coating process for the light-emitting layer and began shipping samples on August 1.

The new OLED lighting module does not use blue emitting materials in the OLED panel and the light from the panel contains a minimal portion of blue light. According to the companies, this is less than 1% of the amount in the 3000K-type OLED lighting module developed by Mitsubishi Chemical and Pioneer.

The panel is a candle-color type with a 1900K color temperature; this is suitable for storage lighting of light-sensitive items such as cultural heritage and paintings, as well as lighting for bedrooms and medical practices.

Blue light, which has a wavelength of between 380 and 495 nanometers, has the highest energy among visible light. This is enough to reach the retina at almost full strength. This can cause eye fatigue as well as reduction in quality sleep.

With the increase of smartphone and PC use, the amount of time exposed to blue light is also increasing. Therefore, as the interest in eye health rises, this bluelight-less OLED lighting module development is worthy of attention.


Source: MPOL

Source: MPOL


Source: MPOL

Source: MPOL

[IMID 2015] UDC Develops OLED Patterning Technology with Less Masks

At present, FMM (Fine Metal Mask) is considered the main method for large area RGB OLED panel production. However, due to shadow effect, mask total pitch fluctuations, and mask slit tolerance issues, there is a yield limitation to this technology. This limitation increases as the resolution becomes higher; minimizing the number of FMM during the OLED panel production has been a key issue in RGB OLED production.


In SID 2014, through a paper titled “Novel Two Mask AMOLED Display Architecture”, UDC revealed a technology that can reduce the number of masks used in RGB-FMM method to 2 from previous 3.


Source : UDC, SID 2014

As shown above, this technology coats yellow and blue subpixels using 1 mask each. Following this process, green and red color filters are applied above the subpixels. Pixels are formed as illustrated below.


Source : UDC, SID 2014

UDC explained that this technology improves lifetime of the display overall and reduces energy consumption as blue voltage can be lowered. Additionally, tact time can be reduced through this technology, and increase the yield.


In IMID 2015, UDC presented research of the same title. However, the content of the presentation unveiled more developed research compared to 2014. First of all, in 2014, UDC announced that the panel’s lifetime could be improved by 2 times compared to the RGB method. In IMID 2015, UDC’s announcement changed the figure to 3.3 times increased lifetime.


UDC also revealed that the technology can be actualized through printing method, and has the advantage of being able to print 2 rows of pixels at once. UDC announced that this is most suitable when OVJP (Organic Vapor Jet Printing) applies the printing method.


A new technology called SPR (Sub-Pixel Rendering) was also announced by UDC in this paper. The 2014 SID paper included a method that did not uses SPR. As shown below in figure 1, 4 subpixels of RGY and B are used per pixel.


[Fig. 1], Source: UDC, IMID 2015

During IMID 2015, UDC presented APR technology applied pixel structure. Figure 2 shows 3 subpixels per pixel.


[Fig. 2], Source: UDC, IMID 2015

In this case, as the pixels can be arranged as shown in figure 3, smaller number of subpixels can be used.


[Fig. 3], Source: UDC, IMID 2015

UDC announced that because APR technology allows the number of subpixels per pixel to be reduced to 3 or less, the number of data lines and TFT per pixel can also be reduced together.


UDC explained that this technology can be applied regardless of the display area or resolution, and will be able to be applied to different types of panels.


Mitsubishi Chemical과 Pioneer, Bluelight-less OLED 조명 개발

일본의 Mitsubishi Chemical과 Pioneer가 최초로 Bluelight-less OLED 조명 모듈 개발에 성공했다고 발표했다. 두 회사는 wet coating 공정을 통해 발광층을 만든 이 모듈을 생산하고 지난 1일부터 샘플을 출하하기 시작했다.

이번 새로운 OLED 조명 모듈은 blue 발광 재료를 사용하지 않은 OLED 패널로 발산하는 빛은 최소한의 blue light를 포함하고 있다. Mitsubishi Chemical과 Pioneer는 새로 개발한 OLED 조명 모듈이 이전에 출시한 3000K-type OLED 조명 모듈의 1% 보다 적은 양의 blue light를 낸다고 밝혔다.

패널의 candle-color type은 1900K 색온도를 가지고 있다. 이는 빛에 민감한 문화 유산이나 페인팅 같은 것을 보관하는 곳의 조명뿐만 아니라 의료용과 침실용 조명으로도 적합하다.

380nm에서 495nm 사이의 파장을 가진 blue light는 가시광선 중 가장 큰 에너지를 가지고 있다. 이 빛은 거의 최대 에너지로 망막에 도달하기 충분하다. 망막에 도달한 빛은 눈의 피로뿐만 아니라 숙면을 방해의 원인이 된다.

스마트폰과 PC의 사용 증가로 blue light에 노출되는 시간이 길어지고 있다. 때문에 눈 건강에 대한 관심이 증가되고 있는 상황에서 이번 Bluelight-less OLED 조명 모듈 개발은 주목해야 할 성과가 될 것으로 예상된다.

Source : MPOL

Source : MPOL