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Signal adjusting method and laser scanning projection device

A technology for projection equipment and signal adjustment, which is applied in the field of signal adjustment methods and laser scanning projection equipment, can solve the problems of MEMS transverse resonance frequency difference, abnormal projection image distortion, resonance frequency resonance frequency shift, etc., and meet hardware performance requirements. High, achieve low complexity, and improve equipment performance

Inactive Publication Date: 2019-04-05
GOERTEK OPTICAL TECH CO LTD
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Problems solved by technology

However, there are certain differences in MEMS in production, and the transverse resonance frequency of each MEMS is different; and the resonance frequency of MEMS will shift due to temperature changes for a long time.
The difference in resonance frequency or the phenomenon of resonance frequency shift will cause abnormal distortion of the projected image

Method used

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  • Signal adjusting method and laser scanning projection device
  • Signal adjusting method and laser scanning projection device
  • Signal adjusting method and laser scanning projection device

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Embodiment Construction

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0023] Before introducing the technical solutions provided by the embodiments of the present application, a brief introduction to the structure of the laser scanning projection device is given first.

[0024] Such as figure 1 The shown laser scanning projection device includes: a laser light source 1 , an optical assembly 2 and a scanning mirror 3 . Wherein, the laser light source 1 is used for emitting laser light. During specific implementation, there may be three laser ligh...

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Abstract

An embodiment of the invention provides a signal adjusting method and a laser scanning projection device. The signal adjusting method comprises the following steps that a running signal generated in the running process of a scanning mirror in the first direction is collected; a time difference between the running signal and a driving signal is determined based on the driving signal during runningof the scanning mirror in the first direction; and the clock frequency of a clock signal for controlling the phase of the driving signal is adjusted according to the time difference. According to thetechnical scheme, it can be ensured that the driving signal of the scanning mirror is kept in the relatively stable resonance frequency, influence of difference among equipment hardware or temperaturechange during running on the image projection effect can be reduced, and the equipment performance is improved. In addition, the method and device can be realized in low complexity, the requirement for hardware performance is not high, and the total size of the device is not increased.

Description

technical field [0001] The present application relates to the field of miniature projection technology, in particular to a signal adjustment method and laser scanning projection equipment. Background technique [0002] Compared with the common LCD (liquid crystal micro-projection technology) transmission micro-projection, DLP (digital optical processing technology) reflective micro-projection and LCOS (liquid crystal on silicon) reflective micro-projection, the laser scanning projector (LBS) has a simple structure, small size, It has the advantages of small optical path loss, low power consumption, wide color range, high contrast, high resolution, and no need for focusing. [0003] In the LBS projection system, scanning mirror and laser are the main components. Wherein, the scanning mirror rotates reciprocally around two orthogonal axes respectively, and deflects the combined light beam along two perpendicular directions before projecting it to a predetermined area to gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/00H04N9/31G02B26/10
CPCG02B26/10G09G3/001H04N9/3161
Inventor 高文刚
Owner GOERTEK OPTICAL TECH CO LTD
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