Scanning device, driving condition setting method, and scanning display module

A scanning device for performing raster scanning in an operating state, comprising:

• two scanning axes configured to vibrate in a first direction and a second direction, the two scanning axes have different frequency characteristics, and the frequency characteristics of the two scanning axes satisfy:
• a quantity of significant peaks on a frequency characteristic curve does not exceed a set quantity in a set frequency range,
• wherein the scanning device is an optical fiber scanner, the two scanning axes comprise a first actuating portion and a second actuating portion, the scanning device further comprises an optical fiber cantilever, a driving frequency of the first actuating portion is smaller than that of the second actuating portion, the first actuating portion and the second actuating portion drive the optical fiber cantilever to scan along a raster trajectory, and the frequency characteristic curve comprises at least one of an impedance curve and a phase curve,
• wherein the driving frequency comprises a frequency having a largest amplitude in a driving signal spectrum or a scanning trajectory response spectrum applied to the first actuating portion or the second actuating portion,
• wherein the scanning trajectory response spectrum is a spectrum of a response signal generated, in response to a response to a driving signal on the first or second actuating portion, by a sub-vibration system constituted by the first or second actuating portion and the optical fiber cantilever, and
• wherein a frequency characteristic of the sub-vibration system constituted by the first or second actuating portion and the optical fiber cantilever satisfies:
• a quantity of significant peaks on at least one of an impedance curve or a phase curve does not exceed 5 in a frequency range [0.6*Fx0, 1.3*Fx0], wherein Fx0 is a frequency that is applied to a fast scanning axis and that has a largest amplitude in the driving signal spectrum or in the scanning trajectory response spectrum;
• and
• a frequency difference between resonance frequencies of the second actuating portion and the optical fiber cantilever is greater than 1.2 KHz;
• or
• a frequency difference between resonance frequencies of the second actuating portion and the optical fiber cantilever is less than 5 KHz.