The invention relates to the technical field of intelligent peripherals, in particular to a user-oriented interaction information expansion method, which comprises the following steps that: each keycap acquires displacement and pressure, generates an event packet, uploads the event packet through an
optical wireless link, and obtains a
clock and supplies power; constructing a keycap graph by a
master controller, obtaining an intention vector through graph
convolution and
pooling, inputting the intention vector into a
cyclic network to generate a
pixel matrix and a
phase matrix, and downlink after Bernoulli sparse coding; performing key cap side orthogonal
matching pursuit decoding and four-round gradient optimization, and outputting a differential pixel set, a
differential phase set and a synchronization mark; the master control refreshes the digital
micromirror array and the ultrasonic
phased array in a differential manner, locks a frame-level
time sequence through a synchronization pulse, compensates link
delay and hardware drift in real
time based on Kalman filtering, and keeps an optical-acoustic alignment error to be less than 100 microseconds; degradation monitoring enables a link to be automatically switched to a pre-carved character layer and to be quickly recovered when the link is abnormal, and a keyboard interaction information expansion scheme with
low delay and high consistency is provided.