CPC G09G 3/006 (2013.01) [G02F 1/13306 (2013.01); G09G 3/3648 (2013.01); H05K 9/0067 (2013.01); G02F 2202/22 (2013.01); G09G 2330/04 (2013.01)] | 18 Claims |
1. A display driver comprising:
a driver circuit that drives an electro-optical panel;
an output terminal that outputs an output signal from the driver circuit;
an output line that couples the output of the driver circuit and the output terminal; and
an inspection circuit that detects an abnormality of the output signal output by the driver circuit to the output line by monitoring a voltage of the output signal, wherein
the inspection circuit determines whether the voltage of the output signal is abnormal by comparing the voltage of the output signal with a first reference voltage and a second reference voltage in each given cycle,
a value of the first reference voltage is higher than a value of the second reference voltage, and
the inspection circuit includes:
a reference voltage generation circuit that generates a plurality of voltages and that outputs the first and second reference voltages selected from the plurality of voltages in each given cycle; and
a comparison circuit that:
compares whether the voltage of the output signal is between the first and second reference voltages;
determines that the voltage of the output signal is abnormal when the voltage of the output signal is between the first and second reference voltages;
determines that the voltage of the output signal is normal when the voltage of the output signal deviates from a range between the first and second reference voltages; and
provides abnormality information including a comparison result to a control circuit that controls the display driver.
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