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Laser projection device

A laser projection and laser technology, applied in projection devices, optics, optical components, etc., to eliminate the phenomenon of "color block" color cast and improve the display quality.

Pending Publication Date: 2020-09-29
QINGDAO HISENSE LASER DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a laser projection device, which can solve the problem of color cast such as local "color spot" and "color block" in the three-color laser projection screen in the prior art

Method used

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1 of the present application provides a laser projection device, Figure 5A-1 As shown, the laser projection device 10 includes a housing 101, and a projection imaging system wrapped in the housing 101. The projection imaging system includes a light source unit 100, an optical mechanical unit 200, and a lens unit 300, wherein the light source unit 100 emits three-color laser beams, and the three-color laser beams The polarization direction of the laser beam is different, such as Figure 6A As shown, the light source unit of the laser projection device in this example emits light in two polarization directions, P light and S light.

[0061] Figure 5A-2 for Figure 5A-1 A simplified schematic diagram of the decomposition. Such as Figure 5A-2 As shown, the laser projection device includes a light source unit 100. The three-color laser light emitted by the light source unit 100 is incident on the diffusion wheel 140. The rotation of the diffusion wheel diff...

Embodiment 2

[0091] Embodiment 2 provides a laser projection device, in which a moving phase retarder is arranged in the output light path of the light source unit. Specifically, such as Figure 8 As shown, the difference from the first embodiment is that the phase retarder is not arranged on the diffusion wheel 140, but can be arranged at multiple positions in the optical path.

[0092] In one implementation, such as Figure 8 As shown, the moving phase retarder can be arranged in the combined light output path of the light source unit 100 and at the P1 position before the incident diffusion wheel 140, preferably, the moving phase retarder is arranged between the beam shaping component and the diffusion wheel 140, The phase retarder can receive the reduced beam, and the size of the phase retarder itself can also be set smaller, which is beneficial to reduce the cost and the volume of the fixed structure and the driving structure. Moreover, realizing depolarization before the polychromat...

Embodiment 3

[0101] This implementation three provides a laser projection device, the application such as Figure 9A The light path shown.

[0102] Such as Figure 9A As shown, the light source part of the laser projection device includes at least three sets of laser assemblies, and each set of laser assemblies emits laser beams that are not used by the other two sets of laser assemblies.

[0103] The laser component 8110 emits light of a first color, the laser component 8102 emits light of a second color, and the laser component 8103 emits light of a third color.

[0104] The light of the three groups of laser components is combined through the combination lens group 8120, see Figure 9A , the light-combining lens group includes a fourth light-combining lens 8121 and a fifth light-combining lens 8122, wherein the first light-combining lens 8121 and the fifth light-combining lens 8122 may both be dichroic lenses.

[0105] Among them, the fourth light combining lens 8121 transmits the li...

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Abstract

The invention provides a laser projection device, which comprises a housing and a laser assembly with a red laser light-emitting area, a blue laser light-emitting area and a green laser light-emittingarea, and is characterized in that the polarization directions of three-color laser are different; and the moving phase delay piece is arranged in the light path before the light beam emitted by thelaser assembly enters the projection lens, so that the color cast phenomenon such as color spots and color blocks presented in a local area of a projection picture can be eliminated, and the display quality of the projection picture is improved.

Description

technical field [0001] The invention relates to the technical field of laser projection display, in particular to a laser projection device. Background technique [0002] The laser light source has the advantages of good monochromaticity, high brightness, and long life, and is an ideal light source. As the power of laser devices increases to meet the requirements of industrial applications, lasers are gradually being used as light sources for lighting. For example, in recent years, lasers have been used as projection light sources in projection equipment, gradually replacing mercury lamp lighting. Compared with LED light sources, lasers also have the advantages of small etendue and high brightness. [0003] Lasers are divided into blue lasers, red lasers and green lasers according to the type of light emitting, which emit blue lasers, red lasers and green lasers respectively. Among them, the blue laser was the first to be applied industrially. The red and green lasers were...

Claims

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Application Information

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IPC IPC(8): G03B21/20G02B27/10G02B27/48G02B27/28
CPCG03B21/2033G03B21/208G03B21/2073G02B27/1006G02B27/48G02B27/286
Inventor 李巍田有良田新团
Owner QINGDAO HISENSE LASER DISPLAY CO LTD
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