• Journal of the Semiconductor & Display Technology
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• v.22 no.1
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• pp.33-38
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• 2023

As the demand for large flexible displays such as tablet computers continues to rise, there is an increasing need for cost-efficient colorless and optically transparent polyimide film that can meet the desired performance, particularly optical transmittance. In this study, we investigated a detailed procedure for achieving optimal optical transmittance using two different combinations of monomers: 6FDA+BAPB and 6FDA+BPA+TFDB. We employed a design of experiment method to systematically synthesize polymers, allowing for the optimization of optical transmittance. In addition, we were able to achieve uniform thickness in the films by using a doctor blade. By comparing the price and optical transmittance of four different monomer combinations, we obtained fundamental data on the production of polyimide films that can be customized to meet the specific price and performance requirements of manufacturers. This approach enables users to select the most suitable polyimide film based on their desired price and performance parameters while achieving optimal optical transmittance.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1995.05a
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• pp.230-233
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• 1995

Using Polyimide Langmuir-Blodgett(LB) films as a tunneling barrier, Current -Voltage(I-V) characteristics and inelastic electron tunneling spectroscoupy(IETS) of the junctions incorporating 1-layer orgainc monolayer were invesgated. Several peaks originating in vibrational modes of constituted molecules of 1-layer monolayers were clearly observed in the IET spectra.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1995.11a
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• pp.139-142
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• 1995

Polyimide(PI) thin films are fabricated by vapor deposition polymerization(VDP) from PMDA and DDE. The IR spectrum show that PAA the films are changed into PI films by curing. The activation energy of PI films is estimated to be 0.32 [eV] at the electric field of 0.133 [Mv/cm]. The resistivity is about 4.5${\times}$10$\_$16/ [$\Omega$$.$cm] at room temperature.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.204-204
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• 2006

The interfacial interaction along with microstructure and some properties of the polyimide(PI)/silica or polyimide/silsesquioxane hybrid nanocomposites will be discussed with reviewing recent publications including our own works. Poly(vinyl silsesquioxane) (PVSSQ), aminosilane (APS), and titania can effectively play vital roles to compatibilize the PI/silica hybrid composites by enhancing interfacial interaction or reducing agglomeration of large domains, which helps the formation of nanocomposites for the PI/silica hybrid system.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1577-1579
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• 2008

A mixture of two different types of polyimide, one having an alkyl side chain and ordinarily used for homeotropic alignment, and the other without a side chain and ordinarily used for planar alignment, is deposited and baked at high temperatures. When the resulting cell is filled with a nematic liquid crystal, it is found that the pretilt angle is a function of the baking temperature or mixing ratio, and can be controlled continuously over the range 0 to 90.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1584-1587
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• 2008

We proposed a technique controlling continuously pretilt angle in full range with high process margin. The proposed method is characterized by tuning thickness of heterogeneous polyimide (PI) layer that homeotropic PI is mixed with planar PIs.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.317-319
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• 2008

Photo-alignment layer which contains cinnamate is difficult to generate pretilt angle of liquid crystals. In order to enhance pretilt angle, blending poly (amic acid) between containing fluorine poly (amic acid) and 1,2,3,4-cyclobutanetetracaroxylic dianhydride (CBDA) / 3,5-diaminobenzyl alcohol (DBA) were used. For photoreaction, cinnamate was conjugated by interfacial reaction with blending polyimide.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.774-777
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• 2005

In this work, a soft embossing method is proposed to fabricate microgrooves on polyimide surfaces. Apply these resulting patterned micro-grooved polyimide surfaces as the liquid crystal alignment layers. The director of liquid crystal molecules aligns perfectly along the direction of microgrooves.

• Proceedings of the Membrane Society of Korea Conference
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• 1998.04a
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• pp.70-71
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• 1998

1. 서론 : 상업적으로 널리 사용되고 있는 cellulose acetate, polysulfone 등과 같은 막 소재는 유기용매에 대한 화학적 안정성이 떨어지므로 새로운 막분리 소재가 필요로 되고 있다. 기계적 강도, 열적 안정성이 뛰어난 Polyimide 는 거의 모든 종류의 유기용매에 대한 안정성이 우수하여 비수계용 한외여과의 분야에서 높은 잠재력을 지니고 있다. 그러나 Polyimide 는 대부분의 유기용매에 녹지 않으므로 상전환방법에 의한 비대칭막을 제조하기가 어려웠다. (생략)

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.506-508
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• 2007

We studied the nematic liquid crystal (NLC) alignment capability with a new alignment method utilizing an inkjet printed polyimide (PI) layer. A good, uniform LC alignment was achieved by the good PI printing using a new alignment method. The pretilt angle generated on the printed PI layer using the alignment method was almost the same as that on printed PI layer using rubbing alignment method. In addition, the good electro-optical performances of the new aligned twisted nematic (TN) cell with printed PI surface was obtained