Holographic display apparatus and method of driving the same

A holographic display apparatus comprising:

• a light source unit configured to emit light;
• a spatial light modulator comprising a pixel connected to a gate line and a data line, the spatial light modulator modulating the light emitted from the light source unit to output a hologram image;
• and
• a spatial light modulator control circuit configured to control the spatial light modulator, the spatial light modulator control circuit comprising:
• a data driving circuit configured to provide a data voltage to a signal line;
• a demultiplexer circuit comprising a plurality of switching elements connected to the signal line and sequentially turned on, the demultiplexer circuit transferring the data voltage to a transfer line through a turned-on switching element from among the plurality of switching elements;
• and
• a first element connected between the transfer line and the data line, the first element passing a current that flows from the transfer line to the data line when a voltage level of the transfer line is higher than that of the data line, the first element blocking a current that flows from the data line to the transfer line when a voltage level of the transfer line is lower than that of the data line.