Method for manufacturing a liquid crystal display panel comprising performing a photo-alignment treatment using a photo-alignment treatment device having a light irradiation mechanism and a rotation adjustment mechanism

The method for manufacturing a liquid crystal display panel, comprising:

• forming a first vertical alignment film on a surface of a first substrate including a pixel electrode and forming a second vertical alignment film on a surface of a second substrate including a counter electrode;
• performing a photo-alignment treatment by irradiating the first substrate provided with the first vertical alignment film on the surface of the first substrate and the second substrate provided with the second vertical alignment film on the surface of the second substrate with light emitted from a light source through a polarizer;
• and
• forming a liquid crystal layer containing liquid crystal molecules between the first substrate and the second substrate,
• the photo-alignment treatment being performed using a photo-alignment treatment device for a liquid crystal display panel substrate, the photo-alignment treatment device comprising:
• at least one light irradiation mechanism including a light source, a polarizer, and a rotation adjustment mechanism and configured to irradiate the liquid crystal display panel substrate with light emitted from the light source through the polarizer;
• and
• a stage configured to support the liquid crystal display panel substrate thereon,
• the photo-alignment treatment device being configured to irradiate the liquid crystal display panel substrate with light while moving the liquid crystal display panel substrate or while moving the light source with respect to the liquid crystal display panel substrate,
• a light irradiation direction with respect to the liquid crystal display panel substrate being parallel to a moving direction of the liquid crystal display panel substrate or a moving direction of the light source,
• the rotation adjustment mechanism being configured to rotate a polarization axis of the polarizer to adjust an exposure direction on a surface of the liquid crystal display panel substrate to substantially 45° with respect to the light irradiation direction;
• wherein the liquid crystal display panel includes, in the given order:
• the first substrate including the pixel electrode;
• the first vertical alignment film;
• the liquid crystal layer containing the liquid crystal molecules;
• the second vertical alignment film;
• and
• the second substrate including the counter electrode,
• the liquid crystal display panel includes a pixel in which four alignment regions having different tilt azimuths of the liquid crystal molecules are arranged along a longitudinal direction of the pixel,
• the four alignment regions include a first alignment region having a tilt azimuth of substantially 45°, a second alignment region having a tilt azimuth of substantially 135°, a third alignment region having a tilt azimuth of substantially 225°, and a fourth alignment region having a tilt azimuth of substantially 315°, where the azimuth along a lateral direction of the pixel is defined as 0°,
• the liquid crystal molecules are aligned substantially perpendicularly to the first vertical alignment film and the second vertical alignment film and tilted along the tilt azimuths when no voltage is applied to the liquid crystal layer,
• the liquid crystal molecules are more greatly tilted along the tilt azimuths when voltage is applied to the liquid crystal layer, and
• the liquid crystal molecules have a twist angle of substantially 0° in each of the four alignment regions in a plan view of the liquid crystal display panel.