Yoon-Sung Um

Pixel-Division Technology for High-Quality Vertical-Alignment LCDs

An innovative technology, charge-shared super patterned-electrode vertical-alignment (CS-SPVA), used for improving off-axis image quality within VA liquid crystal display (VA-LCD) is proposed. The CS-SPVA imposes different electric voltages with two or three subpixels automatically by a unique charge-sharing topology without increasing the number of data or gate bus lines, which results in significantly improved off-axis image quality without serious side effects. In particular, the three-subpixel-CS-SPVA shows the best off-axis image quality reported so far for the VA-type LCDs. The proposed technology may be the ultimate solution in overcoming the vulnerable point of VA-LCD for severe competition with alternative LCD technology.

34.3: A Novel Charge-Shared S-PVA Technology

A charge-shared super patterned-ITO vertical alignment (CS S-PVA) LCD mode is proposed. CS S-PVA controls the voltage ratio between two sub-pixels by a unique charge-sharing topology, resulting in improved off-axis image quality and transmittance increase without any side effects. Moreover, the new S-PVA LCD mode is free of image-sticking. Operating schemes and display performance of CS S-PVA are presented.