Pixel design and electro‐optic properties of multi‐domain vertically aligned mode

Abstract

Multi-domain texture is obtained in VA LCD by depositing dielectric black matrix on the color filter substrate above the electrode. It is shown, that without additional technological operations wide viewing angle and high brightness can be achieved. Background and objectives

P‐86: Grid‐Aligned Multi‐Domain Mode

“…In contrast to the known designs [2][3][4][5][6], in our case there is no need to deviate the nematic director from the electric field. So there is no need to deposit dielectric material on the top of the pixel electrode or counter electrode area (or both).…”

“…Basically, the cell design is very similar to that of multidomain displays with corrugated substrates [2][3][4][5]. Transparent electrodes and vertical (homeotropic) aligning (VA) layers are deposited on the faces of the opposite substrates and the room between the substrates is filled with a liquid crystal possessing negative dielectric anisotropy.…”

“…In the state without electric field the liquid crystal is aligned perpendicularly to the substrates. To avoid leakage of light in crossed polarizers the profile of the substrates usually is either made shallow [2,3], or the grooves are filled with planarizing insulating material [5]. We propose for the same purpose to make the grooves so dense, that distortion of the liquid crystal is localized close to the surface and its effect on the polarization of the incident light is minimized.…”

“…From the point of view of improving liquid crystal display (LCD) viewing angle multi-domain techniques [1][2][3][4][5][6] are very promising. Due to summation of the transmission of differently aligned parts of a pixel in any observation direction electrooptic response becomes more monotone and gray scale inversion is avoided almost for any angle of light incidence.…”

“…Vertically (homeotropically) aligned modes became most popular because of their high contrast. There are different variants of such displays, where domains are generated either due to a fringe field of the pixel electrode, or due to relief made on one [2][3][4][5], or both substrates, or by combination of such fringe and ridge fields [6]. Common feature of these modes is that in the OFF state electric field applied to the opposite electrodes (lower than threshold value) deviates from the nematic director field.…”