Signal processing device capable of reducing breakdown phenomenon in case of power off or power down, and image display device including the same

A signal processing device comprising:

• a first logic circuit configured to process a first voltage range among voltage levels of input signals;
• a second logic circuit configured to process a second voltage range higher than the first voltage range among the voltage levels of the input signals;
• and
• a protection control circuit disposed between the first logic circuit and the second logic circuit and including a protection switch and a protection controller for controlling the protection switch,
• wherein the voltage levels of the input signals are greater than an internal allowable voltage level, and the protection switch is turned on when the protection controller is turned off or powered down, and
• wherein the protection switch is turned on when operation power for operating the second logic circuit is applied and the operation power is not applied to the protection controller.

An image display apparatus comprising:

• a display;
• and
• a signal processor configured to output display data to the display,
• wherein the signal processor is configured to process input signals received from an Ethernet terminal,
• wherein the signal processor comprises:
• a first logic circuit configured to process a first voltage range among voltage levels of input signal;
• a second logic circuit configured to process a second voltage range higher than the first voltage range among the voltage levels of the input signals;
• and
• a protection control circuit disposed between the first logic circuit and the second logic circuit and including a protection switch and a protection controller for controlling the protection switch,
• wherein the protection switch is turned on when the protection controller is turned off or powered down, and
• wherein the protection switch is turned on when operation power for operating the second logic circuit is applied and operation power is not applied to the protection controller while operation power for operating the protection switch is applied.