To solve a problem that an area coverage modulation system has in relation to the mounting cost for an external IC and to solve the problem that a clock signal is delayed behind a start pulse signal when a signal is input from the external IC without providing a delay circuit to an input part of a driver.

A display device has a pixel area where pixels including sub-pixels are arranged in a matrix, a source signal line driving circuit, a gate signal line driving circuit, and a control circuit, and is characterized in that the sub-pixels, source signal line driving circuit, gate signal line driving circuit, and control circuit have thin film transistors formed on a substrate and the control circuit has a circuit outputting signals for driving the source signal line driving circuit and gate signal line driving circuit with a vertical synchronizing signal, a horizontal synchronizing signal, and a dot clock signal input from outside the substrate.

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