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A Speckle Dissipating Light Source Special for Laser Display

A laser display and speckle dissipation technology, which is applied in optics, optical components, instruments, etc., can solve the problems of reducing laser temporal coherence and spatial coherence, and achieve low autocorrelation sidelobes, good chaotic effects, and wide bandwidth effects

Active Publication Date: 2020-11-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the light source used for laser display can simultaneously reduce the temporal coherence and spatial coherence of the laser, and can also integrate multiple lasers, the present invention provides a dedicated dispersive spot light source for laser display

Method used

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  • A Speckle Dissipating Light Source Special for Laser Display
  • A Speckle Dissipating Light Source Special for Laser Display

Examples

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Embodiment 1

[0026] In the present embodiment, the n lasers 105 are semiconductor lasers for laser display; the converging lens 101 is a high-curvature uniform converging lens with a focal length of 5 mm; the aperture of the aperture 102 is 2 mm; the focal length of the collimating lens 103 is 1.5 mm; The reflectivity of transflector 104 is 20%, and collimating lens 103 and transflector 104 are closely fixed; The distance between converging lens 101 and n lasers 105 is not limited, the distance between diaphragm 102 and converging lens 101 The distance is 5 mm; the distance between the diaphragm 102 and the collimating lens 103 is 1.5 mm; all optical elements are coaxially placed.

[0027]The specific operation of this embodiment is as follows: the light emitted by n lasers 105 is converged by the converging lens 101, the focal point of the converging light passes through the aperture of the diaphragm 102, is collimated by the collimating lens 103, and is incident on the transflective mirro...

Embodiment 2

[0029] In the present embodiment, n lasers 105 are semiconductor lasers for laser display; the light emitted by the lasers is reflected by the mirror 106 and then injected into the converging lens 101, the converging lens 101 is a high-curvature uniform converging lens with a focal length of 7mm; the aperture 102 adopts Homogenous light-flux tube or the homogeneous light-flux tube in the multimode optical fiber replaces, and its aperture is 1.6mm; The focal length of collimating lens 103 is 0.9mm; The reflectivity of mirror 104 is 40%, will collimate The distance between lens 103 and transflector 104 is set to 10mm; the distance between converging lens 101 and n lasers 105 is not limited, and the distance between homogeneous light flux pipe and converging lens 101 is 7mm; homogeneous light flux pipe and quasi The distance between the straight lenses 103 is 0.9mm; each optical element is placed coaxially.

[0030] The specific operation of this embodiment is: the light emitted ...

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Abstract

The invention discloses a speckle eliminating light source dedicated to laser display and relates to the field of laser display light sources. The light source comprises n lasers. The laser light emitted by the n lasers irradiates a converging lens for convergence, then passes through the aperture of a diaphragm, is collimated by a collimating lens, and irradiates a semi-transparent mirror. When the reflected light of the semi-transparent mirror returns the converged laser light back to the light-emitting laser to form feedback, the light of other lasers also enters the laser to form multi-light injection. Each laser is affected by the injection of other lasers under the effect of optical feedback so as to generate a chaos state. The transmitted light of the semi-transparent mirror is directly output as low coherent light. The speckle eliminating light source, in virtue of the combination of the optical feedback and the light injection in a laser display system, enables the lasers to generate chaotic laser light, reduces the temporal coherence of the laser light, and simultaneously reduces the coherence of the laser light by multiple paths formed by the diaphragm, and finally realizes time-space de-coherence light source.

Description

technical field [0001] The invention relates to the field of light sources for laser display, in particular to a speckle-dissipating light source for laser display. 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. Therefore, researchers have proposed a variety of methods to suppress speckle by controlling the temporal and spatial coherence of laser light. The specific methods are mainly divided into three categorie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48
CPCG02B27/48
Inventor 赵彤王安帮郭园园吴梅李青天
Owner TAIYUAN UNIV OF TECH
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