Panel driving circuit that generates panel test pattern and panel test method thereof

A pattern generation unit of a panel driving circuit, the pattern generation unit comprising:

• a horizontal synchronizing signal generation unit producing a cycle of the horizontal synchronizing signal whenever a number of cycles of a system clock reaches a predetermined value;
• a data activating signal generation unit producing a data activating signal whenever the number of cycles of a system clock reaches a first predetermined value;
• a vertical synchronizing signal generation unit producing a cycle of the vertical synchronizing signal whenever a number of cycles of the horizontal synchronizing signal reaches a second predetermined value;
• and
• a pattern decision making unit producing a pattern signal selecting a test pattern whenever a number of cycles of the vertical synchronizing signal reaches a third predetermined value.

A panel driving circuit comprising:

• a pattern generation unit that produces a-pattern test data and a-pattern test signals in response to a system clock;
• and
• a selection unit that chooses and outputs the pattern test data and the pattern test signals that are outputted from the pattern generation unit,
• wherein the pattern generation unit calculates the number of cycles of the system clock and produces the pattern test data and the pattern test signals in response to the number of cycles of the system clock,
• wherein the pattern test data comprises data for testing an external panel,
• wherein the pattern generation unit outputs the pattern test data in response to a vertical synchronizing signal and a horizontal synchronizing signal generated by the pattern generation unit,
• wherein the vertical synchronizing signal is produced based on a predetermined number of the horizontal synchronizing signal.