Method and device for eliminating speckle in laser display by chaotic circuit modulating laser

Abstract

The invention discloses a method and a device for eliminating speckle in laser display by a chaotic circuit modulating laser. Specifically, after a chaotic circuit generates a broadband chaotic electrical signal, the broadband chaotic electrical signal passes a broadband amplifier, then the signal is inputted into a biasing device, a driving voltage of the laser driving circuit is also inputted into the biasing device and is mixed with the chaotic electrical signal which is subjected to broadband amplification to supply power to multiple lasers for laser display to drive the lasers to work, atthe same time, a chaotic modulation signal is also outputted, the signals are connected in parallel to modulate the laser, through a line with a delay larger than 0.3 ns or larger than 6cm, each laser outputs chaotic laser, at the same time, an output signal has no coherence when reaching a screen end, which means no-speckle beam output is obtained, the light outputted by the lasers is concentrated by a converging lens, the light is collimated by a collimating lens and then is parallelly injected into a MEMS lens, and the imaging of the laser display system on a curtain is achieved through corresponding scanning circuit adjustment. According to the method and the device, the full power output of the lasers is ensured, the energy utilization rate is improved, and the system is simple and reliable.

Description

technical field [0001] The invention relates to the application field of laser modulation of chaotic circuits, in particular to a method and device for eliminating speckle in laser display by modulating a laser with a chaotic circuit. Background technique [0002] With its advantages such as large color gamut, high color saturation, high electro-optical conversion efficiency, and long light source life, laser display technology has become the most promising new generation display technology after CRT, plasma, and LCD / LED display technologies. However, due to the extremely high temporal and spatial coherence of laser light, compound speckle exists in laser projection imaging, which seriously reduces the resolution and contrast of projected images. This problem has always been a key issue hindering the development of laser display technology. [0003] In order to solve this problem, most researchers add different devices to reduce the coherence of the laser in the optical pat...

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Problems solved by technology

[0008] In order to solve the problem in the prior art that the utilization rate of the laser is not high and the output cannot reach the maximum due to the existence of speckle, the present invention provides a method and device for eliminating speckle in laser display by modulating the laser with a chaotic circuit

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