Patent ID: 8823904
Filing Date: 2014-09-02
Classification: G02F

Abstract:
1. A method for obtaining parameters of a liquid crystal (LC) display device, wherein the LC display device consists of at least one display area and comprises a first substrate, a second substrate, a first polarizer, a second polarizer, at least one LC alignment apparatus and a LC layer, the first substrate has a common electrode thereon, the second substrate consists of at least one pixel, each of which contains a pixel electrode and is disposed within the display area, the first polarizer is disposed on the first substrate, the second polarizer is disposed on the second substrate and with a polarization axis being perpendicular to that of the first polarizer, the LC alignment apparatus is disposed between the first and the second substrates, for aligning the LC molecules thereon tilting toward the inner or the outer portion of the display area, and the LC layer with chiral dopants is disposed between the first and the second substrates, with optimal parameters of Δnd when d/p, such that, for an arbitrary α angle, the optical transmittance T can be larger than or at least equal to a minimum transmittance value T min (T≧T min ), where Δn is the index of birefringence of the LC material, d is the thickness of LC layer, p is the chiral pitch of the LC with chiral dopants, and α is the angle between the orientation of LC molecules at middle of the LC layer and the direction of the polarization axis of the first or the second polarizer, the method comprising the steps of: (1) finding the contour map of optical transmittance T as a function of Δnd and d/p for different α angles by using experimental measurements or theoretical calculations according to the LC material used in the LC layer, the concentration of chiral dopants, the thickness of the LC layer, and the geometric design of the LC alignment apparatus; and (2) selecting a minimum transmittance value T