25.4: Advances and Issues in White OLED and Color Filter Architecture

Chu, Changwoong; Ha, Job; Choi, Junho; Lee, Sungsoo; Rhee, Jungsoo; Lee, Dongwon; Chung, Jinkoo; Kim, Hyoseok; Chung, Kyuha

doi:10.1889/1.2785504

Cited by 22 publications

(15 citation statements)

References 2 publications

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“…For the large sized OLED TV and lighting, white organic light emitting diode (WOLED) technology has been developed [2][3][4][5][6]. Product cost as well as performance is an important point for large-sized OLED TV.…”

Section: Introductionmentioning

confidence: 99%

21.1: Invited Paper: Technological Progress and Commercialization of OLED TV

Oh¹,

Shin²,

Nam³

et al. 2013

Symp Digest of Tech Papers

104

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World's first 55‐inch OLED TV has been developed and recently launched mass production with excellent display image quality. We employ IGZO TFT backplane and white OLEDs with WRGB pixel design. Those technologies enable panel size scalability as well as mass production with lifetime reliability. For commercializing large‐size OLED TV, the issues and challenges on panel design and driving, including LG Display's recent experience will be presented.

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Section: Introductionmentioning

confidence: 99%

21.1: Invited Paper: Technological Progress and Commercialization of OLED TV

Oh¹,

Shin²,

Nam³

et al. 2013

Symp Digest of Tech Papers

104

View full text Add to dashboard Cite

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“…White organic light-emitting diodes (WOLEDs) have attracted great interest by researchers as eco-friendly lighting sources as an alternative to a mercury containing fluorescent lamp and is a strong candidate as a large-scale process for OLED TV. 1,2 The elimination of the fine metal mask (FMM) is a big advantage of WOLEDs with a color filter (CF) in the manufacturing process. However, it has been challenged due to low efficiency and lifetime.…”

Section: Introductionmentioning

confidence: 99%

15‐in. RGBW panel using two‐stacked white OLED and color filters for large‐sized display applications

Han¹,

Tak²,

Ahn³

2011

J Soc Info Display

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Abstract— A 15‐in. HD panel employing two‐stacked WOLEDs and color filters for which the color gamut can be as high as 101.2% (CIE1976) and the power consumption is 5.22 W. The WOLEDs exhibit a current efficiency of 61.3 cd/A and a power efficiency of 30 lm/W at 1000 nits and their CIE coordinate is (0.340, 0.334). A 15‐in. RGBW panel was investigated to verify the electrical and optical performance compared to that of a 15‐in. RGB TV made by using FMM technology. The characteristics of the 15‐in. RGBW panel are comparable to those of the 15‐in. RGB panel. Color filters combined with WOLEDs is a possible patterning technology for large‐sized OLED TV, which surpasses the limits of fine‐metal‐mask technology.

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“…[1,2] Though WOLED+CF patterning method needs no fine metal mask (FMM), it has been challenged due to its low efficiency, [3] since WOLED has low current efficiency corresponding average value of each efficiency of RGB monocolor OLED, and since CF of each subpixel absorbs about 2/3 of the white light. To overcome the issue, two methods were proposed, i.e., one is 4-subpixel color filter of RGBW, [2] and the other is tandem structure in which a charge generation layer (CGL) connects two independent OLED units.…”

Section: Introductionmentioning

confidence: 99%

60.3: Two‐Stacked White Organic Light‐Emitting Diodes Consisting of Fluorescent and Phosphorescent Hybrid Structure with High Efficiency and Good Color Characteristics

Pieh¹,

Myung-Seop²,

Sung³

et al. 2009

Symp Digest of Tech Papers

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We report an improved bottom-emission two-stacked white OLED structure consisting of one unit emitting fluorescent blue light and the other unit emitting phosphorescent yellow in one-host and two-dopant (R+G) system. By searching EL condition optimizing both phosphorescent green and red dopants within just one lightemitting layer, we can get WOLEDs suitable for a display application with very high current and power efficiencies, and excellent color characteristics. Our device exhibits high external quantum efficiency of 28.8%, current efficiency of 56.5 cd/A, and power efficiency of 30 lm/W at 5.9 V and 1000 nit where color point is (0.368, 0.385) in x-y color space (CIE 1931). Halflifetime (LT 50 ) of the device at 1000 nit is estimated more than 31,000 hrs and color variation by aging is suppressed within less than 0.02 in u '-v'color space (CIE 1976). Color filter developed for our WOLED enables color gamut to become wider than the 100% NTSC in uniform color space (u', v'). IntroductionWhite organic light emitting diode (WOLED) has been attracting researchers' interests in view point of lighting sources which are eco-friend since no mercury is involved, and in view point of a strong candidate for OLED display for large-sized substrate being larger than Gen. 4 (730 x 920 mm 2 ) with a combination of color filter (CF).[1,2] Though WOLED+CF patterning method needs no fine metal mask (FMM), it has been challenged due to its low efficiency,[3] since WOLED has low current efficiency corresponding average value of each efficiency of RGB monocolor OLED, and since CF of each subpixel absorbs about 2/3 of the white light. To overcome the issue, two methods were proposed, i.e., one is 4-subpixel color filter of RGBW,[2] and the other is tandem structure in which a charge generation layer (CGL) connects two independent OLED units. [4,5] There have been many studies about the development of high efficiency WOLEDs. In the late-news paper at SID'08 [6], Liao et al.reported their tandem WOLEDs with 56 cd/A, 30 lm/W, CIE (0.34, 0.40), and 5.9 V at 1000 nit by "combining fluorescent and phosphorescent emission". In order to increase the efficiency, they applied an orange dopant into a light-emitting layer, instead of a deep red dopant, but they have showed broad electroluminescent (EL) spectrum in the phosphorescent emitting portion of the white spectrum. In this work, we focus on improving efficiency and color characteristics of the phosphorescent emitting portion which is strongly affected by energy transfer from phosphorescent host to red dopant via green dopant. We demonstrate two-stacked WOLEDs in which a fluorescent blue stack and a phosphorescent stack are connected by the charge generation layer. The latter stack whose emission layer was co-deposited with phosphorescent red and green dopants was optimized by controlling doping ratio of the two dopants. And then, we find it is possible to get relatively sharp emission peaks in red, green, and blue wavelength ranges for display application, while still maintaining the hi...

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25.4: Advances and Issues in White OLED and Color Filter Architecture

Cited by 22 publications

References 2 publications

21.1: Invited Paper: Technological Progress and Commercialization of OLED TV

21.1: Invited Paper: Technological Progress and Commercialization of OLED TV

15‐in. RGBW panel using two‐stacked white OLED and color filters for large‐sized display applications

60.3: Two‐Stacked White Organic Light‐Emitting Diodes Consisting of Fluorescent and Phosphorescent Hybrid Structure with High Efficiency and Good Color Characteristics

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