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Projection display method based on Lissajou figure scanning mode

A technology of scanning mode and projection display, applied in the field of projection display

Active Publication Date: 2012-10-10
XI AN ZHISENSOR TECH CO LTD
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  • Abstract
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Problems solved by technology

The current projection display methods based on the Lissajous figure scanning method have no reports of technical solutions

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  • Projection display method based on Lissajou figure scanning mode
  • Projection display method based on Lissajou figure scanning mode
  • Projection display method based on Lissajou figure scanning mode

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specific Embodiment 2

[0072] refer to Figure 4 , in this embodiment, it is necessary to complete the display of the graphic "circle". According to the technical solution of the present invention, the method for performing projection display in this embodiment based on the Lissajous figure scanning method includes the following specific steps:

[0073] Step 1: Calculate the time matrix T of the Lissajou graph M×N :

[0074] The vibration expression of the miniature torsion mirror 102 is

[0075]

[0076] Among them, θ x (t) is the vibration angle of the miniature torsion mirror in the x-axis direction, θ y (t) is the vibration angle of the micro torsion mirror in the y-axis direction, f x is the scanning frequency in the x-axis direction, in this example f x 12775Hz, f y is the scanning frequency in the y-axis direction, in this example f y 6375Hz, θ x is the amplitude in the x-axis direction, in this example θx is 4.8°, and its radian value is 0.0838, θ y is the amplitude on the y-axis...

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Abstract

The invention discloses a projection display method based on an Lissajou figure scanning mode, which belongs to the field of projection display. The method comprises the steps of calculating a time matrix T M*N of an Lissajous figure, seeking an image dot matrix according to a image to be displayed and acquiring a grid plane dot matrix B M*N according to a display position; seeking subscripts corresponding to the element of 1 in B M*N in turn and storing elements corresponding to the same subscript in T M*N as a matrix C 1*Z; according to the value of C 1*Z after ranking controlling the laser 101 to emit light at a corresponding time point in a period T, and repeating according to the time of the T period to complete projection display. The projection display provided by the invention has the advantages that a brand new projection display method with fast response and high efficiency is provided, the time matrix is utilized repeatedly by requiring just one calculation, thus the calculation time is saved, and figures or character dot matrixes in the image can be used repeatedly, thus the storage space is saved. The method can be applied to a projection display system based on a micro torsion mirror. The system has the advantages of high projection brightness, low energy consumption, small volume and convenient carrying, and is the future development direction of portable projection devices.

Description

[0001] Field [0002] The invention belongs to the field of projection display and relates to a novel projection display method. Background technique [0003] refer to figure 1 Shown is a projection display device based on tiny twisting mirrors. The miniature torsion mirror 102 vibrates under the control of the drive circuit, deflects the laser beam emitted by the laser 101, and forms a Lissajous figure 103 with a rectangular outer contour on the projection plane; the projection plane should be balanced with the miniature torsion mirror 102 The outgoing light is perpendicular to the position, otherwise the projected graphics will be distorted. The device has the characteristics of small size, low cost, low energy consumption, high brightness and simple process, and is one of the current and future research hotspots. [0004] The micro torsion mirror 102 is a beam deflection device manufactured based on MEMS technology. The two-dimensional micro torsion mirror vibrates perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00H04N5/74
Inventor 乔大勇夏长锋刘耀波李昭梁小伟
Owner XI AN ZHISENSOR TECH CO LTD
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