Pixel electrode structure for high transmittance in a multi-domain vertical alignment liquid crystal display device

Abstract

We propose a pixel electrode structure for the multi-domain vertical alignment liquid crystal mode with high optical efficiency. We form a micro-slit electrode structure on the top substrate to reduce the width of disclination lines at domain boundaries. We insert additional electrodes on the bottom substrate to improve the transmittance at the edges of each pixel. We confirm that using both structures, the transmittance can be increased from 22.9% to 27.3% with no change in the operating voltage.

High-transmittance Multi-domain Vertical Alignment Liquid Crystal Device with Protrusion Structure

“…Since the micro-slit in our previous work plays the role of the virtual protrusion, both of previous and proposed structures have almost the same mechanism of the tilt regulation at the region of cross-shaped electrode. Other than the region of cross-shaped electrode, the proposed structure shows the same distribution of LCs as previous structures [8,10].…”

“…We also compared our results with that for the electrode structure that includes the previously proposed micro-slit at the position of the protrusion structure. [10]. All of the structures have the same saturation voltage of 8 V. The transmittances of the conventional, micro-slit, and proposed protrusion structures were 22.9%, 24.4%, and 25.3%, respectively.…”

“…Thus, we confirmed that the transmittance was enhanced to 25.3% when using the proposed protrusion structure. The transmittance can be increased from 25.3% to 28.2% when we use additional edge electrodes [10].…”

“…Recently, we have proposed a cross-shaped slit electrode structure to enhance the transmittance in a micro-patterned VA mode; in this method, the width of the disclination lines was reduced and the transmittance at the edges of each pixel was improved [10]. However, the width of the disclination lines at the center of the pixel must be further reduced.…”

High transmittance pixel structure for the multidomain vertical alignment mode

“…Thus, the LCs near the black matrix has an azimuth angle of 45° with respect to the TA of the polarizers, as shown in the top view of Fig. 2(b) [14]. Therefore, the transmittance of the proposed structure at the pixel boundaries can be higher than that of the conventional structure.…”