Liquid crystal display with wide viewing angle and method for making it
View Patent ↗The present invention relates generally to the field of electronics and may be used for making displays and, in particular, liquid crystal information displays, panels, cells e.t.c. The object of invention is to simplify the method for making liquid crystal devices by reducing the number of technological operations and consequently to reduce the cost of liquid crystal display without sacrificing the quality (wide viewing angle). To achieve this the electric field applied to the liquid crystal in such display has the non-uniform component parallel to the plane of the substrates, which leads to the non-uniform reorientation of the aforementioned liquid crystal in the space between the aforementioned electrodes within the pixel area and hence improves optical properties of this display in various directions of observation.
1. A method for making a liquid crystal display with wide viewing angle comprising:
depositing first and second conductive electrodes and homeotropic aligning layers on facing surfaces of flat parallel substrates, each of the electrodes on a respective one of the facing surfaces, the first conductive electrode including a plurality of electrode sections;
filling the space between the first and second conductive electrodes with nematic liquid crystal possessing negative dielectric anisotropy
wherein connecting alternating ones of the electrode sections of the first conductive electrode to electric field generating potentials of opposite polarity as referenced to an electric field potential applied to the second conductive electrode generates a non-uniform electric field that orients molecules of the liquid crystal in the space between the first and second conductive electrodes, the electric field having components parallel to the plane of the substrates having various directions.
2. The method according to claim 1 , characterized in that the doubled product of the liquid crystal thickness by the birefringence of the liquid crystal chosen to be equal to an odd number of the light wavelengths of light transmitted through the liquid crystal to form an image.
3. The method according to claim 1 , characterized in that chiral dopant is added to the liquid crystal with such concentration that equilibrium pitch of the liquid crystal equals four times the liquid crystal thickness and the product of the liquid crystal thickness by the liquid crystal birefringence is made equal to the integer number of the light wavelengths of light transmitted through the liquid crystal to form an image.