CN204667037U - A kind of projection laser engine - Google Patents

Abstract

The utility model discloses a laser engine for projection. The semiconductor laser array module is composed of RGB three-color semiconductor lasers arranged in close arrangement, and the reflector array includes a plurality of reflectors arranged in a parabolic manner. , the reflector array is installed on the right side of the semiconductor laser array module, and the semiconductor laser and the reflector are in one-to-one correspondence. The described dispersive spot and beam shaping module includes a scattering sheet and a concave lens. The scattering sheet and the concave lens They are installed directly under the mirror array in turn, and the control switch is electrically connected with the semiconductor laser array module. The utility model can reduce the number of lenses used for shaping in the projection light source module through the reflector array arranged in a parabolic manner, and improve the light energy utilization rate of the system. cost.

Description

A laser engine for projection

technical field

The utility model relates to the technical field of projection display, in particular to a laser engine for projection.

Background technique

Laser full-color display technology is an emerging display technology. Compared with Ultra High Performance (UHP) and Metal Halide Lamp (MHP) as light sources, semiconductor lasers are driven by DC; Because light-emitting diode (Light Emission Diode, LED) is used as the light source, the laser has the characteristics of high monochromaticity and high color saturation; compared with the structure using the color wheel, the all-laser display overcomes the problem of short service life of the color wheel, and at the same time Can improve the overall brightness of the system.

At present, projector optical engines are mainly divided into three types: Digital Light Process (DLP), Liquid Crystal on Silicon (LCOS), and Liquid Crystal Light Valve (LCV) according to different spatial modulation technologies. Among them, the LCD and LCOS structures require the incident light to be single-polarized, and the DLP structure does not require the polarization of the incident light, so the linearly polarized light source with excellent performance becomes the best choice for the light source.

At present, laser projection adopts two methods of fiber coupling and spatial light coupling. The disadvantage of fiber coupling is that the device cannot be miniaturized. The X prism or dichroic mirror structure is mostly used for spatial optical coupling. The X prism process is complicated and the cost is high, and the dichroic mirror structure cannot be further miniaturized. Furthermore, both of the above two coupling methods require a certain number of lenses to transform the light beam, which will increase the loss of light energy, thereby reducing the light energy utilization rate of the entire system and affecting the brightness of the projector.

Therefore, in order to reduce the light loss of the projector and increase the brightness of the projector, it is necessary to improve the structure of the optical engine.

Utility model content

The purpose of the utility model is to provide a laser engine for projection in order to remedy the defects of the prior art.

The utility model is achieved through the following technical solutions:

A laser engine for projection, including a control switch, a semiconductor laser array module, a reflector array, a dispersive spot and a beam shaping module, and the semiconductor laser array module is composed of RGB three-color semiconductor lasers arranged in close arrangement , the mirror array includes a plurality of mirrors arranged in a parabolic manner, the mirror array is installed on the right side of the semiconductor laser array module, and the semiconductor laser and the mirror are in one-to-one correspondence, the dissipation The spot and beam shaping module includes a scattering sheet and a concave lens, and the scattering sheet and the concave lens are sequentially installed directly under the mirror array, and the control switch is electrically connected with the semiconductor laser array module.

A cooling device for TEC components is installed on the semiconductor laser array module to ensure stable operation of the system.

A collimating mirror is installed in front of each semiconductor laser for collimating the outgoing beam of the semiconductor laser.

The reflective mirrors arranged in a parabolic manner are coated with a metal film or a dielectric film to achieve high-efficiency reflection of the array laser.

The concave lens and the reflecting mirror constitute a confocal system, so as to obtain a parallel light beam for projection with a suitable spot size.

The scattering sheet can be controlled by a motor to rotate, or it can be stationary or an electronically controlled liquid crystal device can be selected, so that speckles can be eliminated.

For different micro-display panels, such as DMD chips, LCOS chips and LCD panels, the semiconductor lasers in the utility model can run at the same time or in time-sharing.

Use the three primary color lights provided by RGB three-color lasers to replace the traditional method of using a single laser light source to irradiate the color wheel to generate three-color light, which completely solves the problem of short service life of the color wheel. At the same time, the full laser display has better color reproduction. , the advantages of higher brightness, and because the commercial semiconductor laser technology is more mature, the cost of using RGB three-color semiconductor lasers is greatly reduced.

The mirror array arranged in a parabolic manner is used to replace the traditional method of using X prisms or dichroic mirrors to combine the three primary color beams, which greatly reduces the number of lenses used for shaping. At the same time, the mirrors are coated with There is a metal film or a dielectric film to achieve high-efficiency reflection of the laser beam. In the utility model, the number of lenses used between the semiconductor laser module and the speckle-dissipating shaping module is zero, which reduces the optical loss of the system, so that the light energy utilization rate can be improved, and a high-brightness outgoing beam can be obtained.

The utility model has the advantages that: the utility model can reduce the number of lenses used for shaping in the projection light source module through the reflector array arranged in a parabolic manner, and improve the light energy utilization rate of the system. Simple, reduces the cost of the whole system.

Description of drawings

Fig. 1 is a structural schematic diagram of the laser projection light source of the present utility model;

Fig. 2 is the structure schematic diagram of semiconductor laser array of the present invention;

FIG. 3 is a schematic diagram of a two-dimensional structure of a mirror array arranged in a parabolic manner.

Detailed ways

As shown in Figures 1, 2, and 3, a laser engine for projection includes a control switch 1, a semiconductor laser array module 2, a reflector array 3, and a speckle and beam shaping module 4, and the semiconductor laser array module 2 It is composed of RGB three-color semiconductor lasers 5 arranged in close arrangement. The reflector array includes a plurality of reflectors 6 arranged in a parabolic manner. The reflector array 3 is equipped with the positive On the right side, and the semiconductor laser 5 is in one-to-one correspondence with the reflector 6, the dispersive spot and beam shaping module 4 includes a diffuser 7 and a concave lens 8, and the diffuser 7 and the concave lens 8 are installed on the reflector in turn Directly below the array 3 , the control switch 1 is electrically connected to the semiconductor laser array module 2 .

A cooling device for the TEC element is installed on the semiconductor laser array module 2 to ensure stable operation of the system.

A collimating mirror is installed in front of each semiconductor laser 5 for collimating the outgoing light beam of the semiconductor laser.

The reflectors 6 arranged in a parabolic manner are coated with a metal film or a dielectric film to achieve high-efficiency reflection of the array laser.

The concave lens 8 and the mirror 6 constitute a confocal system, so as to obtain a parallel light beam for projection with a suitable spot size.

The scattering sheet 7 can be controlled by a motor to rotate, or it can be stationary or an electronically controlled liquid crystal device can be selected, so that speckles can be eliminated.

The semiconductor laser array module is composed of RGB three-color lasers densely arranged, and the light sources on the array can be arranged in various ways; high-quality white light can be obtained by adjusting the number ratio of each primary color semiconductor laser. Since the divergence angle of semiconductor lasers is relatively large, collimating drum mirrors are placed after each laser to obtain parallel light. The control switch is used to control whether the laser works at the same time or time-sharing, so it is suitable for different micro-display components, such as DMD chips, LCOS chips and LCD panels.

The schematic diagram of the three-color semiconductor laser array structure is shown in Figure 2. The RGB three-color lasers are arranged in a dense arrangement. Figure 2 only lists a possible arrangement. The actual number of lasers is determined by the final needs. White balance requirements are determined.

The reflector array arranged in a parabolic manner is the key part of the utility model, as shown in Figure 3, it is composed of a parabolic structure module and a reflector coated with a metal film or a dielectric film. The number of reflecting mirrors is not limited to the number shown in FIG. 2 , and the number should be consistent with the number of lasers in the semiconductor laser array module, and the positions should be in one-to-one correspondence. Since the parallelism of the light beam after passing through the drum mirror is relatively good, and the spot size is relatively small, the size of the reflector should match the spot size. The reflector can be fixed with the card slot on the top, or it can be fixed on the module with superglue. Because of the paraboloid structure, the reflected laser beams will all converge at the focal point of the paraboloid. It should be noted that, for the convenience of understanding, Figure 3 only shows a two-dimensional cross-sectional view, and the actual device should be a device similar to a parabolic reflective bowl, with a parabolic structure.

The role of the diffuser is to eliminate the speckle effect caused by the coherence of the laser. The converging beam first passes through the diffuser and then through the concave lens. The device for eliminating speckle can be a motor-controlled rotating scattering sheet, or a stationary scattering sheet, or an electronically controlled liquid crystal device can be used to eliminate speckle. The focal point of the concave lens coincides with the focal point of the mirror array, so that a parallel light beam is emitted, and the light energy can be effectively and uniformly used.

Claims (6)

1. a kind of laser engine for projection, it is characterized in that: comprise control switch, semiconductor laser array module, reflecting mirror array and dissipating spot and beam shaping module, described semiconductor laser array module is to be densely arranged by RGB three-color semiconductor laser The reflector array is composed of a plurality of reflectors arranged in a parabolic manner. The reflector array is installed on the right side of the semiconductor laser array module, and the semiconductor laser and the reflector are in one-to-one correspondence. Yes, the speckle dissipation and beam shaping module includes a scattering sheet and a concave lens, and the scattering sheet and the concave lens are sequentially installed directly under the mirror array, and the control switch is electrically connected to the semiconductor laser array module. 2. A laser engine for projection according to claim 1, characterized in that: a heat sink for TEC elements is installed on the semiconductor laser array module. 3. A laser engine for projection according to claim 1, characterized in that: a collimating mirror is installed in front of each semiconductor laser. 4. A laser engine for projection according to claim 1, characterized in that: said mirrors arranged in a parabolic manner are coated with a metal film or a dielectric film. 5 . The laser engine for projection according to claim 1 , wherein the concave lens and the reflector form a confocal system. 6 . 6. A laser engine for projection according to claim 1, characterized in that: said scattering sheet can be rotated by motor control, can also be stationary or select an electronically controlled liquid crystal device.