the present invention provides a liquid crystal display panel and manufacturing method thereof . the lcd panel in accordance with the present invention includes a lower substrate including a thin film transistor and a pixel electrode , an upper substrate including a common electrode facing the lower substrate , a liquid crystal layer formed between the upper and lower substrates , and an alignment layer formed of an inorganic substance containing silicon , oxygen , and carbon on the upper and lower substrates . the transmittance of light through the lcd panel is high and is practically independent of the deposition temperature of the sioc alignment layer over a wide range of deposition temperatures . the deposition of the alignment layer can be performed over a wide range of deposition temperatures while maintaining high levels of light transmission .