A device includes a pixel array, a row driver configured to, generate a plurality of control signals, drive a plurality of rows of the pixel array using the plurality of control signals, and generate a plurality of clock signals, a row multiplexer configured to receive the plurality of clock signals, and transmit one clock signal of the plurality of clock signals, a data driver configured to transmit a plurality of data signals to the pixel array by column units, each pixel of the plurality of pixels includes, a light emitting device, a shift register configured to receive the selectively transmitted clock signal from the row multiplexer, and generate a width adjusted pulse width modulation (PWM) signal based on a desired brightness level of the light emitting device, and a transistor configured to transmit a driving current to the light emitting device based on the PWM signal.