A fiber optic scanning device and a projection display module

By using piezoelectric actuators and feedback electrodes to detect feedback signals in the fiber optic scanning device, the problems of increased size, power consumption, and cost caused by the increase in sensors are solved, achieving stable display and cost reduction of the scanner.

CN116256891BActive Publication Date: 2026-06-30CHENGDU IDEALSEE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU IDEALSEE TECH
Filing Date
2022-09-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing fiber optic scanning device feedback control schemes require additional sensors, leading to increased module size, power consumption, and cost, as well as increased production and assembly complexity.

Method used

A piezoelectric actuator is used to drive the fiber optic vibration, and the feedback signal of the fiber optic vibration is detected by setting a feedback electrode on the actuator, thus avoiding the need to add an additional sensor and realizing the scanner feedback control.

Benefits of technology

Stable display of the scanner was achieved without adding sensors, reducing module size, power consumption and cost, while ensuring the stability of image display.

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Abstract

This invention discloses a fiber optic scanning device and a projection display module. The fiber optic scanning device includes a piezoelectric actuator for driving fiber optic vibration and an optical fiber fixed on the actuator. The actuator has a sheet-like structure, and the optical fiber is arranged along the axial direction of the sheet-like structure. A driving electrode and a feedback electrode are both disposed on the actuator. The driving electrode is used to apply a driving signal to the actuator. The feedback electrode includes two sub-electrodes, which are symmetrically arranged about the optical fiber. The feedback electrode is used to detect the feedback signal generated by the vibration of the optical fiber on the actuator. This solution avoids the need for additional sensors by detecting the feedback signal generated by the vibration of the optical fiber on the actuator, thereby alleviating the technical problems of increased scanner module size, power consumption, cost, and production assembly complexity caused by adding sensors.
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