• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.407-410
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• 2005

For reducing DFC(Dynamic False Contour), we propose a new PDP driving method by rearrangement of sub-fields. The proposed method constructs a frame using 16 sub-fields for expressing 256 gray levels. Although the number of sub-fields increases, the display time increases compared to the conventional 8 sub-fields driving method. This increase in display time is achieved by properly using both selective writing and selective erasing for each sub-field.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.310-313
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• 2008

Recently, study on the weak interaction energy between the soft polymer surface and liquid crystals has been a primary topic for new LC device applications. In this paper, to understand the switching property of nematic liquid crystals (LCs) at the interface with a weak anchoring boundary, we investigate experimentally the rotation property of surface nematic director by electric field on non-treated Poly-Methylmethacrylate (PMMA, $T_g=110^{\circ}C$, Sigma Aldrich) film observed under various temperatures including the glass transition temperature ($T_g$) of the polymer layer.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1516-1519
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• 2008

We report extremely low doping technology in phosphorescent organic light emitting diodes(PHOLEDs). Highly efficient red PHOLEDs with excellent energy transfer characteristics even under 1 % doping condition have been demonstrated. Results reveal efficient host-dopant system to realize highly efficient PHOLEDs and useful cost saving way by reduction of expensive Ir complex dopants.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1432-1435
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• 2006

We report on carbon nano-fibers (CNFs) for applying to epoxy as a highly thermal conductive adhesive. In order to fabricate CNFs, electro-spinning process was performed with polyacrylonitrile (PAN) solutions. The sample was stabilized at the annealing temperature of $360^{\circ}C$, and carbonized from 900 to $1100^{\circ}C$. It is shown that the synthesized CNFs have a good thermal conductivity of several hundred W/m K. LED backlight units (BLUs) fabricated with MPCB using CNF-mixed epoxy give a better heat dissipation and higher performance than normal LED BLUs. On the basis of SEM, XRD, and FTIR, the characteristics of CNFs are described.

• 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).

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.218-220
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• 2009

We proposed an enhanced substrate-assembling technique using adhesive patterned spacers for flexible liquid crystal displays (LCDs). The negative photoresister was used for the rigid columnar spacers and the strong substrate-bonding agent. The proposed technique is expected to be a good candidate for manufacturing method of flexible LCDs.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.42-45
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• 2009

We report simple structure red phosphorescent devices comprising only single organic layer structure. Maximum current efficiency of 9.44 cd/A and the driving voltage of 5.4 V are obtained in this single layer structure PHOLEDs, respectively. The mixed host system using electron transporting and hole transporting materials doped with $Ir(piq)_3$ provides such high efficiency and reasonable driving voltage. The principal to simplification is the direct charges injection from the metallic electrodes into mixed host materials.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.900-903
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• 2007

We introduce non-contact surface modification using trimethylchlorosilane (TMCS) for thin film transistor application. The surface is not contacted to the TMCS solution because it is vaporized at room temperature. The hydrophobic surface with contact angle $of\;{\sim}\;70^{\circ}$ can be achieved by the transfer of TMCS using a PDMS mold.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1470-1473
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• 2007

We have demonstrated the optimization of white organic light-emitting diodes with two separated emissive layers using a blue fluorescent and a red phosphorescent dopant. The maximum luminous efficiency of the devices showed 7.93, 9.70, 11.8, and 14.3 cd/A. The $CIE_{xy}$ coordinates also showed (x = 0.33, y = 0.36), (x = 0.33, y = 0.35), (x =0.31, y = 0.35), and (x = 0.29, y = 0.36) at 6V, respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.870-873
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• 2012

The advertisement using DID(Digital Information Display) has been a huge increase in many public spaces. Many company has been advertise their products through DID in recent. In this paper, we suggest more effective advertisement system on DID for advertisers. This system can provide a floating population, operation information and other useful I informations for advertisement. The advertisers can choose and buy the advertisement that they want.