A liquid crystal display screen includes a first substrate, a first alignment layer, a liquid crystal layer, a second alignment layer, and a second substrate. The liquid crystal layer is sandwiched therebetween. The first alignment layer and the second alignment layer correspondingly are disposed on the first substrate and the second substrate. The first alignment layer and the second alignment layer respectively include a plurality of parallel first grooves and perpendicular second grooves. Furthermore, at least one of the alignment layers includes a carbon nanotube layer. The carbon nanotube layer includes at least one carbon nanotube film. The carbon nanotube film comprising a plurality of carbon nanotubes joined end to end and substantially aligned along a single direction.