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Projection control method and micro-electromechanical projection device

A control method and micro-electromechanical technology, applied in projection devices, TVs, color TVs, etc., can solve problems such as bright lines and uneven swing speeds on projected images, and achieve the best image quality

Inactive Publication Date: 2015-11-11
LITE ON TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the MEMS scanning mirror itself also has a resonant frequency
Therefore, when a periodic wave signal is input to control the MEMS scanning lens, the MEMS scanning lens will respond to the harmonic component with the resonant frequency in the periodic wave signal, so that the image beam is scanned due to the oscillation of the MEMS scanning lens. Uneven speed, resulting in bright lines on the projection screen

Method used

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Embodiment Construction

[0045] In an embodiment of the present invention, the projection control method is used to control a micro-electro-mechanical (MEMS) scanning lens. The micro-electro-mechanical scanning mirror assists the projection of the image beam on the plane by swinging, and performs repeated scanning movements on the plane to form a projected image. figure 1 The present invention is a flowchart of a projection control method according to an embodiment of the present invention. refer to figure 1 , in step S110, detecting the resonant frequency of the MEMS scanning lens when it swings around the first swing axis. In step S120, the resonance frequency is provided to the filtering unit as a parameter of the filtering process. In step S130, a first period control signal with a first frequency and a plurality of harmonic components is generated. In step S140 , the first period control signal is filtered by a filter unit, wherein the filter unit filters the harmonic components with the reson...

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Abstract

A projection controlling method for controlling a MEMS scanning mirror to repeatedly scan an image light on a surface and form a projection image is provided. A resonance frequency of the MEMS scanning mirror which swings around a first swing axis is detected and provided to a filter unit as a parameter of a filtering process. A first periodic control signal with a first frequency and a plurality of harmonic components is generated. The harmonic component with the resonance frequency is filtered from the first periodic control signal by the filter unit. The filtered first periodic control signal is provided to the MEMS scanning mirror to control the MEMS scanning mirror to swing around the first swing axis according to the first frequency and to scan the image light on the surface back and forth along a first direction. A MEMS projection apparatus is also provided.

Description

technical field [0001] The invention relates to a projection control method and a microelectromechanical projection device, in particular to a projection control method and a microelectromechanical projection device using a microelectromechanical scanning lens. Background technique [0002] Microelectromechanical systems (MEMS, microelectromechanicalsystems) generally refer to the research field of using microelectronics technology and mechanical engineering technology to manufacture or develop related electronic components and mechanical structures, and then miniaturize related products. Laser projection devices using micro-electro-mechanical (MEMS) scanning lenses are now common in smart phones or laptops due to their small size and low power consumption, and have gradually become an indispensable component of portable audio-visual devices. [0003] Generally speaking, the laser projection device uses micro-electro-mechanical scanning mirrors to project image beams on a sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G02B26/10H04N5/74
CPCG02B26/0833G09G3/346
Inventor 柯呈达
Owner LITE ON TECH CORP