• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.159-161
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• 2007

We fabricated flexible OTFT-backplanes for the electrophoretic display(EPD). The OTFTs employed bottom contact structure on PEN substrate and used the cross-linked polyvinylphenol for gate insulator, pentacene for active layer. Especially, we used PVA/Acryl double layers for passivation of backplane as well as for pixel dielectric layer between backplane and EPD panel. The OTFT-EPD panel worked successfully anddemonstrated to display some patterns.

• Journal of Information Display
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• v.10 no.3
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• pp.107-110
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• 2009

Efficient deep-blue organic light-emitting diodes were demonstrated using 4,4'-bis(9-ethyl-3-carbazovinylene)-1,1'-biphenyl doped in double-emission layers (D-EMLs). The D-EML system, which consists of 2-methyl-9,10-di(2-naphthyl)anthracene and 1,4-(dinaphthalen-2-yl)-naphthalene as blue hosts, was employed to broaden the recombination zone and to ensure the good confinement of the holes and electrons. The optimized device showed a peak current efficiency of 4.47 cd/A, a peak external quantum efficiency of 4.09%, and Commission Internationale de L'Eclairage coordinates of (0.16, 0.10).

• Journal of the Semiconductor & Display Technology
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• v.11 no.4
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• pp.1-6
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• 2012

Keeping the polarization direction of the projection light unchanged is of crucial importance for high quality of images on a double-screen 3D projection display system. It has been found that the deposition of oxide layers on the surfaces of scattering polarizer film results in an improvement of polarization maintenance property of the film. The secondary image formed on the front screen by the light scattered from the rear screen decreases by 30% through the application of oxide layers on both surfaces of the screen. Since the oxide layer can also be used as an anti-reflection (AR) coating of the film, this method is very effective for the projection display applications.

• Journal of Information Display
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• v.7 no.3
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• pp.23-26
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• 2006

We fabricated top emission organic light emitting diode (TEOLED) with transparent metal cathode Barium and Silver bilayer. Very thin Ba/Ag bilayer was deposited on the organic layer by thermal evaporation. This cathode showed high transmittance over 70% in visible range, and the device with a Ba-Ag has a low turn on voltage and good electrical properties.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.588-591
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• 2004

Polyazomethine type conjugated copolymers containing phenanthridine units, poly(PZ-PTI), were synthesized by Schiff-base reaction. This new conjugated copolymer exhibited improved solubility in common organic solvents due to the presence of alkyl side chains as well as phenanthridine groups. Double layer (ITO/poly(PZ-PTI)/$Alq_3$/Mg) light emitting diode (LED) exhibited enhanced EL emission and efficiency compared to that of single layer (ITO/poly(PZ-PTI)/Mg) LED. With increasing the thickness of $Alq_3$ layer in double layer (ITO/poly(PZ-PTI)/$Alq_3$/Mg) LED the emission peak gradually shifted to the single layer (ITO/$Alq_3$/Mg) LED, confirming good hole transporting behaviour of the synthesized conjugated copolymer.

• Journal of Information Display
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• v.13 no.2
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• pp.61-66
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• 2012

The double-layered Ti/Si barrier metal is demonstrated for the source/drain Cu interconnections in oxide semiconductor thin-film transistors (TFTs). The transmission electromicroscopy and ion mass spectroscopy analyses revealed that the double-layered barrier structure suppresses the interfacial reaction and the interdiffusion at the interface after thermal annealing at $350^{\circ}C$. The underlying Si layer was found to be very useful for the etch stopper during wet etching for the Cu/Ti layers. The oxide TFTs with a double-layered Ti/Si barrier metal possess excellent TFT characteristics. It is concluded that the present barrier structure facilitates the back-channel-etch-type TFT process in the mass production line, where the four- or five-mask process is used.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.683-686
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• 2007

We have developed the transparent passivation layer for transparent organic light-emitting devices (TOLEDs) using CsCl layer. The CsCl passivation layer improves the optical transmittance of Ca/Ag double layer which have used as a semitransparent cathode, resulting in substantial increase of the luminance by the enhanced light extraction out of the cathode surface of the TOLEDs.

• Journal of the Semiconductor & Display Technology
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• v.7 no.2
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• pp.49-53
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• 2008

The yellow base polymer light emitting diodes(PLEDs) with double emission and hole blocking layers were prepared to improve the light efficiency. ITO(indium tin oxide) and PEDOT : PSS[poly(3,4-ethylenedioxythiophene) : poly(styrene sulfolnate)] were used as cathode and hole transport materials. The PFO[poly(9,9-dioctylfluorene)] and MEH-PPV[poly(2-methoxy-5(2-ethylhe xoxy)-1,4-phenylenevinyle)] were used as the light emitting host and guest materials, respectively. TPBI[Tpbi1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene] was used as hole blocking layer. To investigate the optimization of device structure, we prepared four kinds of PLED devices with different structures such as single emission layer(PFO : MEH-PPV), two double emission layer(PFO/PFO : MEH-PPV, PFO : MEH-PPV/PFO) and double emission layer with hole blocking layer(PFO/PFO : MEH-PPV/TPBI). The electrical and optical properties of prepared devices were compared. The prepared PLED showed yellow emission color with CIE color coordinates of x = 0.48, y = 0.48 at the applied voltage of 14V. The maximum luminance and current density were found to be about 3920 cd/$m^2$ and 130 mA/$cm^2$ at 14V, respectively for the PLED device with the structure of ITO/PEDOT : PSS/PFO/PFO : MEH-PPV/TPBI/LiF/Al.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1030-1033
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• 2006

The efficiency stabilization and the color coordinates in blue organic light-emitting devices (OLEDs) with a double emitting layer (DEL) consisting of 4,4'-Bis(carbazol-9-yl)biphenyl (CBP) and 4,4'-Bis(2,2-diphenyl-ethen-1-yl)diphenyl were investigated. The efficiency of the OLEDs with a DEL did not significantly change with an increase in current density. The Commission Internationale de l'Eclairage coordinates of the OLEDs with a DEL 11 V were (0.150, 0.137), indicative of a deep blue color.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1344-1347
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• 2007

We have fabricated bottom gate TFTs with active layers of amorphous/microcrystalline Si double layers (DL). Dynamic electric stresses were applied to DL TFTs and a-Si TFTs to compare their degradation characteristics. The DL TFTs were more stable under dynamic stresses than a-Si TFTs.