Data driving circuit and display apparatus for advoiding data lines being overcharged

A display apparatus comprises a plurality of scan lines and a plurality of data lines;

• a plurality of pixels are defined by the plurality of scan lines and the plurality of scan lines;
• the display apparatus further comprises a data driving circuit for converting digital signals into driving voltages, a scan driving circuit for providing scan signals to the plurality of scan lines, and a time controller for providing clock signals;
• the data driving circuit comprising:
• a shift register circuit, configured to generate a sampling pulse signal based on a set signal and a first clock signal;
• a first latch circuit, configured to electrically connect to the shift register circuit, and sample digital signal to generate a sampled signal based on the sampling pulse signal;
• a second latch circuit, configured to electrically connect to the shift register circuit, detect that whether a MSB of the sampled signal is changed, and outputs a signal for controlling a pre-operation of a current data line;
• a level shift circuit, configured to electrically connect to the second latch circuit, and modulate an amplitude of the sampled signal;
• a DAC circuit, configured to electrically connect to the level shift circuit, and convert the modulated and sampled signal into driving voltage;
• and
• an output circuit, configured to electrically connect to the shift register circuit and the data lines, and provide the converted driving voltage to the current data line;
• wherein the pre-operation is provided with a specified voltage to the current data line before the converted driving voltage is provided to the current data line;
• wherein when the MSB of the sampled signal is changed, the second latch circuit outputs an effective signal, and the second latch circuit further detects whether the current data line is in a specified region, wherein if the current data line is in a specified region, the second latch circuit outputs an invalid signal, and the pre-operation is disabled according to the invalid signal.