Liquid Crystal Display Device and Manufacturing Method Thereof

A liquid crystal display device having a reflective display area and a transmissive display area, the display device including;

• a first substrate, a second substrate, a liquid crystal layer, a first alignment film, a second alignment film, a third alignment film, a pixel electrode, a common electrode, a retardation layer, a material layer for the retardation layer, a sealing material, a first polarizer plate, and a second polarizer plate, in which
• the liquid crystal layer is sandwiched in an opposing space between the first substrate and the second substrate,
• the first alignment film is disposed between the liquid crystal layer and the first substrate,
• the second alignment film is disposed between the liquid crystal layer and the second substrate,
• the pixel electrode and the common electrode are disposed on every pixel at the main surface of the second substrate,
• the reflective display area and the transmissive display area are disposed on every pixel,
• the retardation layer is disposed on the side of the main surface of the second substrate at a portion corresponding to the reflective display area,
• the sealing material seals the liquid crystal layer surrounding a portion between the peripheral edges of the first substrate and the second substrate,
• the first polarizer plate is disposed to the outer surface of the first substrate,
• the second polarizer plate is disposed to the outer surface of the second substrate, and
• the material for forming the retardation layer is formed by polymerizing a liquid-crystalline acrylate monomer by using a photopolymerization initiator having a phosphine oxide structure.

A method of manufacturing a liquid crystal display device in which a liquid crystal layer is sandwiched in an opposing gap between a first substrate and a second substrate, the first substrate and the second substrate are sealed at the outer peripheral edge of the display region thereof by a sealing material, the display region is constituted with a matrix arrangement of a plurality of pixels and a reflective display area and a transmissive display area are disposed on every pixel, the method including;

• a step of forming an alignment film for retardation layer to the main surface of the first substrate and providing the alignment film for the retardation layer with an alignment control function,
• a coating step for the retardation layer material of coating a photocurable acrylated nematic liquid crystal monomer with addition of a photopolymerization initiator having a phosphine oxide structure as a retardation layer material while covering the alignment film for the retardation layer,
• an exposure step of selectively exposing to cure a portion of the retardation layer material corresponding to the reflective display area, and
• an unexposed portion removing step of removing the retardation layer material at a portion corresponding to the transmissive display area.

A method of manufacturing a liquid crystal display device in which a liquid crystal layer is sandwiched in an opposing gap between a first substrate and a second substrate, the first substrate and the second substrate are sealed at the outer peripheral edge of the display region thereof by a sealing material, the display region is constituted with a matrix arrangement of a plurality of pixels and a reflective display area and a transmissive display area are disposed on every pixel, the method including;

• a step of forming an alignment film for retardation layer to the main surface of the first substrate and providing the alignment film for the retardation layer with an alignment control function,
• a coating step for the retardation layer material of coating a photocurable acrylated nematic liquid crystal monomer with addition of a photopolymerization initiator having a phosphine oxide structure as a retardation layer material while covering the alignment film for the retardation layer,
• an exposure step of selectively exposing to cure a portion of the retardation layer material corresponding to the reflective display area, and
• a step of transparentizing an unexposed portion which is a portion corresponding to the transmissive display area of the retardation layer material to or higher than the nematic-isotropic transition temperature, and curing the portion by photo-irradiation in the heated state as it is.