Abstract
A photonic integrated circuit (PIC) is required to combine the three basic colors of red, green, and blue laser beams into a single output laser beam to realize an ultracompact full-color laser beam scanning (LBS) display. However, the conventional approach of controlling the color solely by altering the injection currents to the laser diodes constrains the speed required to achieve a high resolution and also results in high power consumption. In this study, we address this challenge by proposing an active PIC based on sputter-deposited thin-film lithium niobate (TFLN) using Mach–Zehnder interferometers (MZIs) to control the intensity of the red, green, and blue colors by applying voltage to the TFLN PIC. These three colors are combined into a single laser beam using a multiplexer-fabricated TFLN waveguide. A bandwidth of 10 GHz, which is wide enough to realize 4K resolution and higher, was experimentally confirmed. The TFLN active PIC successfully achieved full-color generation, demonstrating that the proposed approach can be used to obtain ultracompact, full-color LBS displays.