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Laser speckle inhibition method

A laser speckle and laser technology, applied in optics, optical components, instruments, etc., can solve the problems of damaged light energy utilization, reduced beam quality, and difficulty in applying laser TV.

Inactive Publication Date: 2016-02-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many ways to suppress speckle in the prior art, such as rotating optical fiber method, controlling laser resonator method, vibrating screen method, multi-fiber beam splitting method, ultrasonic grating to eliminate speckle, and phase modulation by rotating phase plate to suppress speckle, etc. , but the existing method needs to be processed by decoherent components after the laser beam is emitted, which greatly damages the light energy utilization rate and reduces the quality of the beam, which is difficult to apply to the display of laser TVs

Method used

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Embodiment 1

[0027] This embodiment provides a method for suppressing laser speckle, including:

[0028] S101, arranging a plurality of laser units in the form of an array with the same light output direction to form an array laser light source;

[0029] Preferably, the multiple laser units are evenly distributed on the array laser light source. The laser unit is preferably a red laser diode, a green laser diode or a blue laser diode. Correspondingly, the wavelengths of the laser diodes are 671nm, 532nm, and 473nm; the powers are 3.5W, 0.32W, and 1.3W, respectively.

[0030] S102. Select several laser units in the array laser light source as a first laser unit group, and the remaining laser units as a second laser unit group. Wherein, the number of laser units in the first laser unit group is the same as or different from the number of laser units in the second laser unit group, so as to ensure that the total output power of the laser array is constant.

[0031] In order to understand t...

Embodiment 2

[0041]This embodiment provides a method for suppressing laser speckle applied to a laser television. Such as Figure 5 As shown, the array laser light source is a red array laser light source 101 , a green array laser light source 102 and a blue array laser light source 103 . The speckles of laser light emitted by the red array laser light source 101 , the green array laser light source 102 and the blue array laser light source 103 are suppressed by the method of the first embodiment. After a series of processing by the modem 2, the laser beam is shot on the laser TV display screen 3. Since the speckle formed by the injected laser light is effectively suppressed, the laser TV screen 3 will not be able to see the speckle, thereby improving the display effect.

Embodiment 3

[0043] This embodiment provides a method for suppressing laser speckle applied to another laser TV. Such as Figure 6 As shown, the array laser light source 1 is a red array laser light source, a green array laser light source or a blue array laser light source. The speckle of the laser light emitted by the array laser light source 1 is suppressed by the method of the first embodiment. Through the crystal or light guide 4 used to generate RGB three colors, the laser light is shot on the laser TV display screen 3, since the speckle formed by the injected laser light has been effectively suppressed, the laser TV display screen 3 will not be able to see the speckle, Thus, the display effect is improved.

[0044] In summary, the present invention provides a method for suppressing laser speckle. Among them, the method adopts the above-mentioned control method in which the light and shade of the first laser unit group and the second laser unit group alternately and gradually chan...

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Abstract

The invention discloses a laser speckle inhibition method, and relates to the technical field of laser display. The method comprises that multiple laser units are arranged in an array form with the same light output direction to form an array laser source; multiple laser units are selected from the array laser source as a first laser unit group, and other laser units form a second laser unit group; the first laser unit group is changed from the first brightness to the second brightness and then to the first brightness; and when the first laser unit group reaches the second brightness, the second laser unit group is changed from the first brightness to the second brightness and then to the first brightness. According to the method, multiple separate laser units emit light alternatively, the difference of the amplitude of adjacent laser units is large, the contrast of speckles gradually reduces, and the speckles are eliminated finally.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a method for suppressing laser speckle. Background technique [0002] In recent years, people's requirements for video display pictures have been continuously improved, and people are constantly pursuing delicate and gorgeous pictures, which requires display devices to present images with richer colors. Among the light sources of many display devices, laser is widely used as the light source of display devices because of its advantages of good monochromaticity, high directivity and high brightness. The spectral lines of the laser are line spectral lines, with high color resolution and high color saturation, and can display very clear and bright colors. There are many spectral lines for lasers to choose from, and there are relatively mature lasers from 400nm to 700nm, which can form a large color gamut chromaticity triangle, which can be closest to the color gamut perceptio...

Claims

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Application Information

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IPC IPC(8): G02B27/48
CPCG02B27/48
Inventor 尧舜吕朝蕙邱运涛贾冠男成健罗校迎王智勇
Owner BEIJING UNIV OF TECH
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