US Patent 7537811 Liquid crystal display device and manufacturing method therefor

A liquid crystal display device is manufactured by placing a liquid crystal composition in the gap between two parallel substrates followed by polymerization to form a liquid crystal layer, wherein the liquid crystal composition comprises a free radical scavenger, no voltage is applied between the electrodes at an initial polymerization period, ultraviolet rays are irradiated at an intensity of 1 mW/cm2 or less at an initial polymerization period, the liquid crystal composition is subjected, prior to the polymerization, to heat treatment at a temperature equal to or above the phase transition temperature of the used liquid crystal, or the liquid crystal composition is supplied dropwise onto a substrate and the substrates are bonded together in vacuum to place the liquid crystal composition into the gap between the substrates. A liquid crystal display device with no or little occurrence of display irregularities is provided.