| Summary: | This paper presents a driving circuitry system for high-resolution, pixelated-LED automotive headlamps. The system consists of an array of pixel drivers, and a row/column driver suitable for an active-matrix array configuration with the individual dimming control capabilities on each pixelated-LED. An asynchronous serial communication protocol is introduced to minimize the number of data transmission interface signals between the row/column driver and pixel drivers. The proposed pixel driver is designed to drive each pixelated-LED with constant current and pulse width modulation (PWM). It contains a memory cell for dimming data, and a sample-and-hold driver stage to minimize the static power consumption of the pixel driver. The proposed system has been fabricated by using a 0.18-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS process. The test chip includes a <inline-formula> <tex-math notation="LaTeX">$2\times16$ </tex-math></inline-formula> pixel array with an embedded row/column driver. The functional operation has been verified with an <inline-formula> <tex-math notation="LaTeX">$8\times16$ </tex-math></inline-formula> LED array system prototype.
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