A signal panel for checking images displayed on liquid crystal devices is disclosed. The signal panel includes: a power supply mainboard; a plurality of low voltage differential signaling plugs arranged on the power supply mainboard for directly engaging with the low voltage differential signaling sockets of the liquid crystal device; a plurality of low voltage differential signaling adapters arranged on the power supply mainboard for engaging with the low voltage differential signaling sockets of the liquid crystal device via the adapters; and a plurality of frequency-angle adjusting switches of the low voltage differential signals arranged on the power supply mainboard for adjusting frequency-angle parameters of the low voltage differential signals of the liquid crystal device. The signal panel can test the liquid crystal device without using connecting wires and signal generators, which effectively reduce the cost.