Patent ID: 7474290

Claim:
A semiconductor device having a liquid crystal driver circuit, wherein said liquid crystal driver circuit comprises: a gray-scale voltage generator circuit; a gray-scale voltage selector circuit which receives gray-scale voltage generated in said gray-scale voltage generator circuit and selects gray-scale voltage corresponding to gray scale; and a buffer which temporarily retains information regarding gray-scale voltage selected in said gray-scale voltage selector circuit and gives said retained information to said gray-scale voltage selector circuit, and said gray-scale voltage selector circuit further comprises: a selector circuit that selects gray-scale voltage generated in said gray-scale voltage generator circuit based on an output from said buffer; an amplifier circuit which, in a gray-scale voltage test of said semiconductor device, compares the gray-scale voltage selected in said selector circuit with reference voltage generated for testing said gray-scale voltage, amplifies differential voltage between those voltages, and outputs the comparison result as binarized voltage from an external terminal; and selection means which selects either said reference voltage or output of said amplifier circuit as information to be input into said amplifier circuit.