A display manufacturing method comprises steps of: moving a first substrate and a second substrate by a conveying apparatus; and implementing a first exposure and a second exposure of the first substrate and a first exposure and a second exposure of the second substrate by at least one light emitting element when the conveying apparatus drives the first and second substrates to pass through the light source module. When the first exposures of the first and second substrates are implemented, the moving directions of the first and second substrates are opposite, or when the second exposures of the first and second substrates are implemented, the moving directions of the first and second substrates are opposite. A photo alignment process is also disclosed.