Advanced technologies for UHD curved OLED TV

Han, Chang-Wook; Park, Jung Soo; Choi, Hong‐Seok; Kim, Tae-Shick; Shin, Young‐Hoon; Shin, Hong-Jae; Lim, Moojong; Kim, Bong-Chul; Kim, Han-Seop; Kim, Bum-Sik; Tak, Yoon‐Heung; Oh, Chang‐Ho; Cha, Soo-Youle; Ahn, Byung‐Chul

doi:10.1002/jsid.287

Cited by 32 publications

(21 citation statements)

References 10 publications

(15 reference statements)

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“…1. Using the inverted structure is a straightforward solution to drive OLEDs with the oxide TFT backplane without using pixel compensation circuits (11), but this structure has other challenging issues.…”

mentioning

confidence: 99%

Transparent amorphous oxide semiconductors for organic electronics: Application to inverted OLEDs

Hosono

Kim

Yoshitake

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

114

112

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Efficient electron transfer between a cathode and an active organic layer is one key to realizing high-performance organic devices, which require electron injection/transport materials with very low work functions. We developed two wide-bandgap amorphous (a-) oxide semiconductors, a-calcium aluminate electride (a-C12A7:e) and a-zinc silicate (a-ZSO). A-ZSO exhibits a low work function of 3.5 eV and high electron mobility of 1 cm 2 /(V · s); furthermore, it also forms an ohmic contact with not only conventional cathode materials but also anode materials. A-C12A7:e has an exceptionally low work function of 3.0 eV and is used to enhance the electron injection property from a-ZSO to an emission layer. The inverted electron-only and organic light-emitting diode (OLED) devices fabricated with these two materials exhibit excellent performance compared with the normal type with LiF/Al. This approach provides a solution to the problem of fabricating oxide thin-film transistor-driven OLEDs with both large size and high stability.inverted OLEDs | electron injection | electron transport | amorphous oxide semiconductor | low work function material E lectronic and photonic devices based on organic semiconductors have attracted much attention due to their intrinsic characteristics that are difficult to achieve in inorganic semiconductors, such as flexibility and the capability of precise molecular design of active organic layers (1-3). However, organic devices suffer from the material properties that organic semiconductors in general have: rather high lowest unoccupied molecular orbital (LUMO) levels and low electron mobilities, such as 10 −6 to 10 −3 cm 2 /(V·s). This leads to inefficiency in electron injection/transport between an electrode and an organic active layer and a large energy loss. In other words, the creation of materials suitable for efficient electron injection layers (EILs) and electron transport layers (ETLs), with very low work functions, reasonable chemical stability, and high electron mobility, should lead to organic devices with improved performance.Organic light-emitting diodes (OLEDs) are regarded as nextgeneration flat-panel displays (4). Although small high-resolution OLED displays are used widely for smart phones/tablets, and large televisions are being commercialized, several issues still remain, such as lifetime, image sticking, power consumption, and production cost (5). The recent high-resolution OLED pixels (6) with reduced aperture ratios [areal ratio of thin-film transistor (TFT) to pixel] raise the importance of the top emissiontype structure for practical use. For large OLEDs, it is unrealistic to use low-temperature polycrystalline silicon (LTPS) TFTs for backplanes. Only oxide TFTs, as represented by a-In-Ga-Zn-O (a-IGZO) (7), are practical candidates for the backplane (8, 9). The current small OLEDs use normal-type structures combined with p-channel LTPS TFTs. However, only n-channel TFTs are possible for oxide TFTs in actual applications. Simple substitution of the p-channel LTPS TFTs wi...

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mentioning

confidence: 99%

Transparent amorphous oxide semiconductors for organic electronics: Application to inverted OLEDs

Hosono

Kim

Yoshitake

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

114

112

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“…Large-sized OLED TVs adopting WOLED and color layer technologies were successfully launched four years ago. [1] Recently, we presented the 3-stacked tandem WOLEDs consisting of two blue and one yellow-green light emitting device units. The 3 stack-2 color WOLED enabled us to produce a 55-inch UHD OLED TV which had peak brightness of 450 nit, full brightness of 150 nit and 90 percent color gamut in DCI color space.…”

Section: Introductionmentioning

confidence: 99%

3‐1: Invited Paper: 3 Stack‐3 Color White OLEDs for 4K Premium OLED TV

Han¹,

Han²,

Joung³

et al. 2017

Symp Digest of Tech Papers

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We report an improved 3-stacked white organic light emitting diode (WOLED) structure comprised of layers emitting red and yellow-green phosphorescence in the 2nd stacked device. We focused on developing the WOLED devices to realize 4K premium OLED TV displaying very high brightness and excellent color characteristics, with the optimized color layer. The WOLED has a high current efficiency of 83 cd/A, and cool white color whose color coordinate is (0.297, 0.317). 65-inch 4K premium OLED TV employing the new WOLED shows 800 nit of peak brightness, and 99 percent color gamut in DCI color space.

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“…Organic electroluminescence devices have been widely explored during the past two decades [1][2]. Particularly, active-matrix organic light-emitting diode (AMOLED) displays are expected to be the dominant technology for the next generation flat panel displays [3][4][5][6]. The vivid color, wide viewing angle, light weight, thin form factor and several other advantages make AMOLEDs very competitive to challenge liquid-crystal display (LCD) technologies.…”

Section: Introductionmentioning

confidence: 99%

54-3:Invited Paper: Flexible Active-Matrix OLET Display on a Plastic Substrate

Hsieh¹,

Chen²,

Generali

et al. 2016

SID Symposium Digest of Technical Papers

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The organic light-emitting transistors (OLETs) with a novel trilayer organic semiconducting heterostructure architecture and good performance, including record high EQE, is presented. In addition, an active-matrix display based on OLETs, without driving TFTs, will be demonstrated on a plastic substrate. The potential advantages of such technologies will be discussed.Author Keywords organic light-emitting transistor (OLET), active-matrix display, flexible, plastic substrate, external quantum efficiency (EQE), organic thin-film transistor (OTFT), organic light-emitting diode (OLED).

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Advanced technologies for UHD curved OLED TV

Cited by 32 publications

References 10 publications

Transparent amorphous oxide semiconductors for organic electronics: Application to inverted OLEDs

Transparent amorphous oxide semiconductors for organic electronics: Application to inverted OLEDs

3‐1: Invited Paper: 3 Stack‐3 Color White OLEDs for 4K Premium OLED TV

54-3:Invited Paper: Flexible Active-Matrix OLET Display on a Plastic Substrate

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