CN-116125739-B - Laser projection device

CN116125739BCN 116125739 BCN116125739 BCN 116125739BCN-116125739-B

Abstract

The invention provides laser projection equipment, which comprises a red laser component, a green laser component and a blue laser component, wherein the red laser component, the green laser component and the blue laser component respectively emit red laser, the red laser component is arranged close to a light outlet of the light source, a static diffusion sheet is arranged in a light combining light path of the blue laser and the green laser or respectively aiming at the blue laser and the green laser, the blue laser and the green laser are diffused and then combined with a red laser beam, a converging lens group is arranged at a light outlet of the light source and used for converging the three-color laser beam after light combination and then emitting from the light outlet of the light source, a diffusion wheel and a light receiving element are arranged between the converging lens and the light receiving element and used for diffusing the three-color laser beam in a converging state, and the light receiving element is a light pipe or a fly eye lens and used for homogenizing the three-color laser beam after diffusion. The laser projection device can present a projection picture with high brightness and good color.

Inventors

YAN KE
TIAN YOULIANG

Assignees

青岛海信激光显示股份有限公司

Dates

Publication Date: 20260508
Application Date: 20190620

Claims (10)

1. The laser projection device is characterized by comprising a light source, a light machine and a lens, wherein the light source is used for providing light source illumination for the light machine, and the lens is used for projection imaging; The light source comprises a red laser component, a green laser component and a blue laser component, and red laser, green laser and blue laser are respectively emitted; The blue laser and the green laser are combined firstly and then are combined with the red laser, and the divergence angles of the fast and slow axes of the red laser emitted by the red laser component are respectively larger than those of the blue laser and the green laser emitted by the blue laser and the green laser; A static diffusion sheet is arranged in a light combining light path of the blue laser and the green laser, or the static diffusion sheet is respectively arranged for the blue laser and the green laser, and the blue laser and the green laser are diffused and then combined with the red laser; A converging lens group is arranged at the light outlet of the light source and is used for converging the three-color laser beams after light combination to form small spots and then emergent from the light outlet of the light source; the diffusion wheel is a rotary diffusion sheet and is positioned between the converging mirror group and the light receiving component and used for diffusing the three-color laser beams in a converging state; the light receiving component is a light pipe or a fly eye lens and is used for homogenizing the diffused three-color laser beams.
2. The laser projection device of claim 1, wherein the stationary diffuser is used to diffuse blue and/or green laser light at an angle of 1 to 3 degrees.
3. The laser projection device of claim 1, wherein the diffuser has at least two zones, wherein the red laser zone divergence angle is the greatest and the blue laser zone divergence angle is the smallest, or the red laser zone divergence angle is the greatest and the blue laser zone divergence angle is the same as the green laser zone divergence angle.
4. A laser projection device as claimed in claim 3, wherein the rotation period of the diffusion wheel coincides with the primary light timing period of the light source.
5. The laser projection device as claimed in claim 1, wherein the focal point of the converging lens group is disposed at a light receiving opening of the light receiving element at a rear end thereof.
6. The laser projection device as claimed in claim 1, wherein the red laser light and the blue laser light are different in polarization direction from the green laser light, and a half-wave plate is disposed in the optical path before the blue laser light and the green laser light are combined with the red laser light, and the half-wave plate is disposed on the light source housing inside a window opened for the laser assembly.
7. The laser projection device as claimed in claim 6, wherein the half-wave plate is one piece, is disposed in an optical path after the blue laser and the green laser are combined and before the red laser is combined, or the half-wave plate is two pieces, which are disposed corresponding to the blue laser and the green laser, respectively.
8. The laser projection device according to claim 1, wherein the red laser light, the blue laser light and the green laser light have different polarization directions, a half-wave plate corresponding to red wavelength is arranged before the red laser light, the blue laser light and the green laser light are combined, the half-wave plate is arranged on the inner side of a window formed for the red laser component on the light source shell, or the half-wave plate is arranged in the inner cavity of the light source and is positioned between the inner side of the light source shell and a light converging lens corresponding to the red laser component.
9. The laser projection device of claim 1, wherein the red, blue, and green lasers are combined and then passed through a homogenizing element comprising a single-sided or double-sided microstructured diffuser.
10. The laser projection device as claimed in any one of claims 1 to 9, wherein the red laser assembly, the green laser assembly, and the blue laser assembly each include a laser and a PCB board disposed on an outer peripheral side of the laser, and the laser includes a plurality of light emitting chips packaged on a substrate.

Description

Laser projection device The application is based on China patent application 201910538765.3 (2019-06-20), and the name of the application is a divisional application of laser projection equipment. Technical Field The invention relates to the technical field of laser projection display, in particular to laser projection equipment. Background The laser light source has the advantages of good monochromaticity, high brightness, long service life and the like, and is an ideal light source. Along with the improvement of the power of the laser device, the requirements of industrial application are met, and the laser is gradually used as a light source for illumination. For example, in recent years, a laser is used as a projection light source in a projection apparatus, instead of a mercury lamp, and the laser has advantages of small etendue and high brightness as compared with an LED light source. The lasers are classified into blue lasers, red lasers and green lasers according to the types of light emission, and respectively emit blue lasers, red lasers and green lasers. Because the light emitting mechanism is different, as shown in fig. 17, the red laser light emitting chip has two light emitting points, but one light emitting chip corresponds to one collimating lens, so that the effect of one collimating lens on two light emitting points is worse than the effect of one collimating lens on one light emitting point, the angle of divergence of the red laser light after exiting from the light emitting surface of the laser component is larger than that of the other two color lasers, however, in practical application, the light path system is shared by the three color lasers, and in the light beam transmission process, the optical lens generally has a light receiving range or light processing efficiency within a certain angle range, and in the case of the red laser, the light beam capacity within a large angle range is easy to lose due to the rapid divergence, so that the light loss rate of the red laser is generally large, and the loss rate is difficult to estimate and difficult to solve by a power compensation method. A solution is needed to solve the problem of unbalanced system color ratio and poor projection picture quality caused by large red laser light loss in three-color laser application. Disclosure of Invention The invention provides a laser projection device which comprises a three-color laser light source and can display a projection picture with high brightness and good color. The invention provides a laser projection device, which comprises a whole machine shell and a light source, wherein the light source comprises a red laser component and a green laser component which are arranged in parallel, and a blue laser component which is vertical to the red laser component and the green laser component, a first light combining lens is arranged at the intersection of the blue laser and the green laser, the first light combining lens transmits the blue laser and reflects the green laser, And a second light combining lens is arranged at the junction of the blue laser, the green laser and the red laser after light combination, the second light combining lens transmits the red laser and reflects the blue laser and the green laser to a third light combining lens, The third light combining lens reflects the red laser, the blue laser and the green laser to the light source light outlet, wherein the first light combining lens, the second light combining lens and the third light combining lens are arranged in parallel Further, the first light converging lens and the second light converging lens have light reflectivity which is larger than light transmissivity; Further, the luminous power of the green laser component is smaller than the luminous power of the red laser component and the blue laser component; further, the light spot size of the red laser reaching the second light combining lens is larger than that of the blue laser and the green laser; Further, a homogenizing element and a converging lens group are sequentially arranged in the light path from the third converging lens to the light outlet of the light source; further, a diffusion sheet is arranged in the optical path from the first light converging lens to the second light converging lens and used for diffusing and transmitting the green laser light and the blue laser light; Further, the homogenizing element is a diffusion sheet with a regularly arranged microstructure, or the homogenizing element is a two-dimensional diffraction element; further, the three-color light source beam enters the light receiving component through the diffusion wheel after exiting from the light source light outlet; Further, a half-wave plate is arranged in the optical path from the first light converging lens to the second light converging lens; The half wave plate is arranged corresponding to the wavelength of the green laser or the half wave plate is arranged corresponding t