Deuk-seok Chung

Carbon nanotube electron emitters with a gated structure using backside exposure processes

We have fabricated fully vacuum-sealed 5 in. diagonal carbon nanotube field-emission displays of a gated structure with reliable electron emission characteristics. Single-walled carbon nanotube tips were implemented into the gate structure using self-aligned backside exposure of photosensitive carbon nanotube paste. An onset gate electrode voltage for emission was about 60 V and the luminance as high as 510 cd/m2 was exhibited under an application of 100 V and 1.5 kV to gate electrode and anode, respectively.

Color filters for reflective display with wide viewing angle and high reflectivity based on metal dielectric multilayer

We report high performance reflective color filters based on one-dimensional metal-dielectric multilayer. Wide viewing angle of ±50°, far beyond that with conventional all-dielectric multilayers, is achieved while maintaining approximately 100% peak reflectance and color reproducibility. Reflectance of 40% in white mode and color gamut of 47% to the United States National Television Systems Committee (NTSC) standard is demonstrated. The proposed color filter is integrated into 3.5-in. color reflective display and shows 30% increase in brightness than conventional dye color filters.

P‐119: A New Charge Pump Pixel Circuit for Reflective Displays

A novel charge pump pixel circuit for reflective display requiring high voltage driving, which is more than 10 V, is proposed for low-power mobile application. By adopting proposed low-voltage frame inversion method, we can reduce input data voltage swing to almost half of driving voltage on a pixel electrode, so the power consumption on parasitic elements can be substantially reduced. The operation of the pixel circuit was confirmed through the prototype of 3.6″ polymer dispersed liquid crystal displays and the simulation results show that the proposed approach reduces the power consumption by 64.3%, compared with the conventional driving method.