CN211014992U - RGB three-color semiconductor laser projection display polarization light splitting system - Google Patents

Abstract

The utility model discloses a RGB three-color semiconductor laser projection display polarization beam splitting system, including first primary color laser diode array I, second, third primary color laser diode array, first wavelength selection spectroscope, second wavelength selection spectroscope, lens and dodging stick; the laser device also comprises a first primary color laser diode array II, an 1/2 lambda wave plate and a polarization beam splitter; the light beam emitted by the first primary color laser diode array I penetrates through the polarization beam splitter, the light beam emitted by the first primary color laser diode array II penetrates through the 1/2 lambda plate and then enters the polarization beam splitter, the light beam is reflected by the polarization beam splitter and then serves as first primary color laser together with the light velocity of the first primary color laser diode array I penetrating through the polarization beam splitter, and the first primary color laser diode array I and the light beams emitted by the second primary color laser diode array and the third primary color laser diode array form a laser projection system together. The utility model discloses a structure is not showing under the prerequisite that increases the system volume and the optical design degree of difficulty, has improved projection luminance, has improved the projection effect.

Description

An RGB three-color semiconductor laser projection display polarization beam splitting system

technical field

The utility model relates to the technical field of laser projection, in particular to a polarized light splitting system for RGB three-color semiconductor laser projection display.

Background technique

From the current market analysis, it has become an inevitable trend for laser projection display to replace traditional bulb projection display. The main difference between these two projection displays is the light source. Laser projection display uses laser as the light source, while bulb projection display is based on light source. The high-pressure mercury-mercury lamp is the light source. Compared with the mercury-mercury lamp, the laser light source has obvious advantages. The life of the laser light source can reach 20,000 hours, while the traditional mercury-mercury lamp is only less than 5,000 hours. The color reproduction of the laser light source is also obvious. Compared with single-color laser + fluorescent color wheel and two-color laser + fluorescent color wheel, the laser projection display system using RGB three-color laser as the light source The color gamut space will be raised to a higher level. The brightness of the displayed picture is higher, the color saturation is comprehensively improved, and the color reproduction is more realistic.

1 is a partial structure diagram of the light source of the existing RGB three-color laser projection display system, including a first primary color laser diode array I10, a second primary color laser diode array 12, a third primary color laser diode array 13, a first wavelength laser diode array I10 Selective beam splitter 14, second wavelength selective beam splitter 15, lens 16 and light homogenizing rod 17; the light beam emitted by the first primary color laser diode array I sequentially passes through the first wavelength selective beam splitter, the second wavelength selective beam splitter and the lens Incident into the homogenizing rod; the light beam emitted by the second primary color laser diode array is reflected by the first wavelength selection beam splitter and then sequentially transmitted through the second wavelength selection beam splitter and the lens, and then enters the homogenizing rod; the third primary color laser diode array The emitted light beam is reflected by the second wavelength-selective beam splitter, passes through the lens, and then enters the homogenizing rod. The three-primary color laser is finally modulated and shaped by the lens optical system and then collected into the homogenizing rod to form a laser projection display system.

The existing RGB three-color laser projection display system has the following shortcomings: the output brightness of the RGB three-color laser projection display system is proportional to the number of laser diodes used, and increasing the number of diodes can increase the brightness output of the system, but as shown in Figure 2. (Fig. 2 shows the case where the number of the first primary color laser diode array I10 is doubled). If the number of laser diodes is increased, the following problems will arise. 1. The increase in the number of diodes will inevitably increase the volume of the system. 2. When the number of diodes increases, the clear aperture will increase accordingly, and the difficulty of optical design will increase. 3. As the brightness of the system increases, the visual speckle displayed by the laser will become more obvious. Likewise, if the number of the second primary color laser diode array 12 and the third primary color laser diode array 13 is also multiplied, the volume and the clear aperture will become very large.

Utility model content

In view of the above problems, the utility model proposes an RGB three-color semiconductor laser projection display polarization light splitting system.

The technical means adopted by the utility model are as follows:

An RGB three-color semiconductor laser projection display polarization beam splitting system, comprising a first primary color laser diode array I, a second primary color laser diode array, a third primary color laser diode array, a first wavelength selective beam splitter, a second wavelength selective beam splitter, a lens and a homogenizing rod; it also includes a first primary color laser diode array II, a 1/2λ wave plate and a polarization beam splitter;

The light beams emitted by the first primary color laser diode array I sequentially pass through the polarization beam splitter, the first wavelength selective beam splitter, the second wavelength selective beam splitter and the lens, and then enter the homogenizing rod;

The light beam emitted by the first primary color laser diode array II is incident on the polarizing beam splitter after passing through the 1/2λ wave plate, and is reflected by the polarizing beam splitter and then sequentially transmitted through the first wavelength selector The beam splitter, the second wavelength-selective beam splitter and the lens are then incident on the uniform light rod;

The light beam emitted by the second primary color laser diode array is reflected by the first wavelength selection beam splitter and then transmitted through the second wavelength selection beam splitter and the lens in sequence, and then enters the uniform light rod;

The light beam emitted by the third primary color laser diode array is reflected by the second wavelength-selective beam splitter, transmitted through the lens, and then incident into the light homogenizing rod.

Further, it also includes a polarization beam splitter adjustment device, and the polarization beam splitter adjustment device includes a base, a polarization beam splitter fixture mounted on the base, and multiple groups of polarized beam splitters placed on the base and the polarization beam splitter. Adjustment components between the fixed frames;

The polarizing beam splitter fixing frame includes two oppositely arranged fixing parts and a polarizing beam splitter mounting part fixed on the fixing parts, and the polarizing beam splitter is mounted on the polarizing beam splitter mounting part;

The adjustment assembly includes an elastic piece and an adjustment screw, the elastic piece is placed between the fixing part and the base, and the adjustment screw connects the base and the fixing part.

Further, the adjustment assembly further includes a guide column, the upper end of the guide column is fixed on the fixing portion, the elastic member is sleeved on the guide column, the base is provided with a guide hole, the guide The lower end of the column is placed in the guide hole.

Further, it also includes a polarizing beamsplitter holder, the polarizing beamsplitter holder includes a clamping fixing part and a clamping part; the clamping fixing part is fixed on both sides of the polarizing beamsplitter mounting part by bolts , the clipping part can fix the polarizing beam splitter on the mounting part of the polarizing beam splitter.

Further, the polarizing beam splitter mounting frame also includes an abutment surface and a polarizing beam splitter mounting surface, the angle between the polarizing beam splitter mounting surface and the lower surface of the fixing portion is 45°, and the polarizing beam splitter is installed On the mounting surface of the polarizing beam splitter, the lower edge of the polarizing beam splitter abuts on the abutting surface.

Further, the adjustment components have four groups, which are arranged at four corners of the base in sequence.

Compared with the prior art, the RGB three-color semiconductor laser projection display polarization beam splitter system of the present invention has the following advantages. Due to the addition of a 1/2λ wave plate and a polarization beam splitter, the number of laser diode arrays can be increased without causing Excessively increasing the volume of the system and the difficulty of optical path design ensures a good laser projection effect and eliminates problems such as speckle caused by laser interference.

Description of drawings

1 is a light path diagram of a prior art RGB three-color semiconductor laser projection display system;

2 is a structural diagram of the prior art RGB three-color semiconductor laser projection display system for increasing output brightness;

3 is a structural diagram of the RGB three-color semiconductor laser projection display polarized light splitting system disclosed by the utility model;

4 is a structural diagram of a polarization beam splitter adjustment device;

5 is a view of the polarization beam splitter adjustment device from the bottom end of the substrate;

6 is a side view of a polarization beam splitter adjustment device;

Fig. 7 is the exploded view of Fig. 4;

Fig. 8 is the exploded view of another direction of the polarization beam splitter adjustment device;

FIG. 9 is a schematic diagram of adjusting the polarization beam splitter (pitch angle);

Fig. 10 is a schematic diagram of adjusting the polarization beam splitter (left and right angles).

In the figure: 10, first primary color laser diode array I, 11, first primary color laser diode array II, 12, second primary color laser diode array, 13, third primary color laser diode array, 14, first wavelength selective beam splitter, 15. Second wavelength selective beam splitter, 16, Lens, 17, Homogenizing rod, 18, 1/2λ wave plate, 19, Polarizing beam splitter, 20, Base, 200, Receiving slot, 201, Guide hole, 21, Polarizing beamsplitter holder, 210, fixing part, 211, polarizing beamsplitter mounting part, 2110, connecting part, 2111, support part, 212, abutting surface, 213, polarizing beamsplitter mounting surface, 22, adjustment assembly, 220, Elastic part, 221, adjusting screw, 222, guide post, 223, threaded post, 23, polarizing beam splitter holder, 230, clamping and fixing part, 231, clamping part.

Detailed ways

As shown in FIG. 3, the RGB three-color semiconductor laser projection display polarized light splitting system disclosed by the utility model includes a first primary color laser diode array I10, a first primary color laser diode array II11, a second primary color laser diode array 12, and a third primary color laser diode array 12. Laser diode array 13, first wavelength selective beam splitter 14, second wavelength selective beam splitter 15, lens 16, light homogenizing rod 17, 1/2λ wave plate 18 and polarizing beam splitter 19;

The light beams emitted by the first primary color laser diode array I10 pass through the polarization beam splitter 19, the first wavelength selective beam splitter 14, the second wavelength selective beam splitter 15 and the lens 16 in sequence and then enter the uniform beam splitter. Light bar 17;

The light beam emitted by the first primary color laser diode array II11 passes through the 1/2λ wave plate 18 and then is incident on the polarization beam splitter 19 , and is reflected by the polarization beam splitter 19 and then sequentially transmitted through the second polarization beam splitter 19 . A wavelength-selective beam splitter 14, the second wavelength-selective beam splitter 15 and the lens 16 are then incident on the homogenizing rod 17;

The light beam emitted by the second primary color laser diode array 12 is reflected by the first wavelength selective beam splitter 14 and then transmitted through the second wavelength selective beam splitter 15 and the lens 16 in sequence, and then enters the uniform light rod 17 middle;

The light beams emitted by the third primary color laser diode array 13 are reflected by the second wavelength selective beam splitter 15 , pass through the lens 16 , and then enter the homogenizing rod 17 .

The first primary color laser diode array I10 and the first primary color laser diode array II11 are two sets of laser diode arrays with the same primary color, the first primary color laser diode array, the second primary color laser diode array and the third primary color laser diode array are R (red). ), G (green) and B (blue), one of the three color laser diode arrays, the order of which can be selected according to needs.

Since the laser is linearly polarized light with a very good degree of polarization, the present invention adds a polarizing beam splitter 19, a 1/2λ wave plate 18 and a first primary color laser diode array II 11, and the 1/2λ wave plate 18 can change from the first primary color The polarization direction of the incident laser light from the laser diode array II11 is such that the polarization directions of the beams emitted by the first primary color laser diode array I10 and the first primary color laser diode array II11 are perpendicular to each other by the same displacement, and the polarization beam splitter 19 can transmit the first primary color laser light. The light beams emitted by the diode array I10 and the light beams emitted by the first primary color laser diode array II11 are reflected, so that the light beams emitted by the first primary color laser diode array I10 and the first primary color laser diode array II11 can be superimposed and input to the next-level system, and then The energy output of the optical system can be increased without increasing the optical clear aperture and increasing the volume as little as possible. At the same time, since the vibration directions of the light beams emitted by the first primary color laser diode array I10 and the first primary color laser diode array II11 are perpendicular to each other, there will be no interference and no speckle, which makes the laser projection display system disclosed in the present invention. Has less visual speckle.

Further, as shown in FIG. 4 , a polarization beam splitter adjustment device is also included. As shown in FIGS. 4 to 8 , the polarization beam splitter adjustment device includes a base 20 and a polarization beam splitter fixing frame mounted on the base 20 . 21 and a plurality of groups of adjustment components 22 placed between the base 20 and the polarizing beam splitter fixing frame 21; The fixing frame 21 includes two fixing parts 210 arranged opposite to each other and a polarizing beam splitter mounting part 211 fixed on the fixing parts 210. The polarizing beam splitter 19 is mounted on the polarizing beam splitter mounting part 211, and the polarizing beam splitter The fixing frame 21 may be an integral casting structure. In this embodiment, the polarizing beam splitter fixing frame 21 is a split structure, the fixing portion 210 is a long plate structure, and the polarizing beam splitter mounting portion 211 includes a connecting portion 2110 and a support part 2111, the support part 2111 is a frame structure with a light-through hole in the middle, the fixing part 210 is fixed on the lower surface of the connecting part 2110 by screws, the support part 2111 has a polarizing beam splitter mounting surface 213, and the front end of the fixing part 210 is formed by bending upwards The abutting surface 212, the angle a between the polarizing beam splitter mounting surface 213 and the lower surface of the fixing portion 210 is 45°, the polarizing beam splitter 19 is mounted on the polarizing beam splitter mounting surface 213, the The lower edge of the polarizing beam splitter 19 abuts on the abutting surface 212 ; the polarizing beam splitter holder 23 is installed on both sides of the support portion 2111 , and the polarizing beam splitter holder 23 includes a clamping and fixing portion 230 and the clamping part 231; the clamping and fixing part 230 is fixed on both sides of the supporting part 2111 by bolts, and the clamping part 231 can fix the polarizing beam splitter 19 on the polarizing beam splitter mounting part .

The adjustment assembly 22 includes an elastic member 220 and an adjustment screw 231. In this embodiment, the elastic member 220 is a spring, the adjustment assembly 22 is placed in the accommodating groove 200 of the base, and the elastic member 220 is placed in the fixing Between the base 210 and the base 20, the adjusting screw 221 connects the base 20 and the fixing part 210. In this embodiment, a threaded column is fixed on the lower surface of the fixing part 210, and the adjusting screw can be inserted from the base 210. The bottom of the base is connected with the threaded column, and adjusting the adjusting screw can change the distance between the fixed part and the base plate, thereby realizing the adjustment of the polarizing beam splitter.

Further, the adjustment assembly 22 further includes a guide post 222 , the upper end of the guide post 222 is fixed on the fixing portion 210 , the elastic member 220 is sleeved on the guide post 222 , and the base 20 is provided with There is a guide hole 201 , the lower end of the guide post 222 is placed in the guide hole 201 , and the guide post 222 slides in the guide hole when the polarizing beam splitter fixing frame 21 is adjusted by adjusting screws.

In this embodiment, the adjustment components 22 have four groups, which are respectively arranged at the four corners of the base.

Figure 9 is a schematic diagram of adjusting the pitch angle of the polarizing beam splitter by using the polarizing beam splitter adjustment device. As shown in the figure, when the pitch angle adjustment of the polarizing beam splitter is required, the polarization can be adjusted with a screwdriver and other tools respectively. Adjustment screw A at the front end of the beamsplitter adjustment device and/or adjustment screw A1 at the rear end and the screw-in length of the threaded post can change the distance L between the front end of the polarizing beamsplitter holder and the base and the rear end of the polarizing beamsplitter holder The distance L1 from the base makes the fixed part have a certain inclination with respect to the horizontal plane, thereby realizing the adjustment of the pitch angle of the polarizing beam splitter fixing frame (B-B1 in the figure).

Figure 10 shows a schematic diagram of adjusting the horizontal (left and right) angle of the polarizing beam splitter using the polarizing beam splitter adjustment device. As shown in the figure, when the tilt angle of the polarizing beam splitter needs to be adjusted, a screwdriver can be used separately. Adjust the adjustment screw C at the left end of the polarization beam splitter adjustment device and/or the adjustment screw C1 at the right end and the screw-in length of the threaded post with other tools, so as to change the distance between the left end of the polarization beam splitter fixing frame and the base and fix the polarization beam splitter The distance between the right end of the frame and the base is convenient to realize the angle adjustment in the horizontal direction of the polarizing beam splitter fixing frame (D-D1 in the figure). In order to better transmit the light beams emitted by the first primary color laser diode array I and reflect the light beams emitted by the first primary color laser diode array II, the projection effect of the laser projection display system is guaranteed.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. An RGB three-color semiconductor laser projection display polarization beam splitting system, comprising a first primary color laser diode array I (10), a second primary color laser diode array (12), a third primary color laser diode array (13), a first wavelength A selective beam splitter (14), a second wavelength selective beam splitter (15), a lens (16) and a light homogenizing rod (17); it is characterized in that it further comprises a first primary color laser diode array II (11), a 1/2λ wave sheet (18) and polarizing beam splitter (19); The light beams emitted by the first primary color laser diode array I (10) pass through the polarization beam splitter (19), the first wavelength selective beam splitter (14), the second wavelength selective beam splitter (15) and the The lens (16) is then incident on the homogenizing rod (17); The light beam emitted by the first primary color laser diode array II (11) is incident on the polarizing beam splitter (19) after passing through the 1/2λ wave plate (18), and passes through the polarizing beam splitter (19) After the reflection, the first wavelength-selective beam splitter (14), the second wavelength-selective beam splitter (15) and the lens (16) are sequentially incident into the uniform light rod (17); The light beam emitted by the second primary color laser diode array (12) is reflected by the first wavelength selective beam splitter (14) and then transmitted through the second wavelength selective beam splitter (15) and the lens (16) in sequence. Incident into the uniform light rod (17); The light beam emitted by the third primary color laser diode array (13) is reflected by the second wavelength-selective beam splitter (15), passes through the lens (16), and then enters the uniform light rod (17). 2. The RGB three-color semiconductor laser projection display polarization beam splitting system according to claim 1, characterized in that: further comprising a polarization beam splitter adjustment device, and the polarization beam splitter adjustment device comprises a base (20), mounted on the a polarizing beam splitter holder (21) on the base (20) and a plurality of groups of adjustment components (22) placed between the base (20) and the polarizing beam splitter holder (21); The polarizing beam splitter fixing frame (21) includes two oppositely arranged fixing portions (210) and a polarizing beam splitter mounting portion (211) fixed on the fixing portions (210), the polarizing beam splitter (19) be mounted on the polarizing beam splitter mounting portion (211); The adjustment assembly (22) includes an elastic member (220) and an adjustment screw (221), the elastic member (220) is placed between the fixing portion (210) and the base (20), and the adjustment A screw (221) connects the base (20) and the fixing part (210). 3. The RGB three-color semiconductor laser projection display polarization beam splitting system according to claim 2, wherein the adjustment assembly (22) further comprises a guide column (222), and the upper end of the guide column (222) is fixed on the On the fixing portion (210), the elastic member (220) is sleeved on the guide post (222), the base (20) is provided with a guide hole (201), and the guide post (222) is provided with a guide hole (201). The lower end is placed in the guide hole (201). 4. The RGB three-color semiconductor laser projection display polarization beam splitting system according to claim 2, characterized in that: further comprising a polarizing beam splitter holding member (23), and the polarizing beam splitter holding member (23) comprises a holding member (23) A fixing part (230) and a clamping part (231); the clamping fixing part (230) is fixed on both sides of the polarizing beam splitter mounting part (211) by bolts, and the clamping part (231) can The polarizing beam splitter (19) is fixed on the polarizing beam splitter mounting part (211). 5. The RGB three-color semiconductor laser projection display polarization beam splitting system according to claim 2, wherein the polarizing beam splitter fixing frame (21) further comprises an abutment surface (212) and a polarizing beam splitter mounting surface (213) ), the angle between the polarizing beam splitter mounting surface (213) and the lower surface of the fixing portion (210) is 45°, and the polarizing beam splitter (19) is mounted on the polarizing beam splitter mounting surface (213) On the top, the lower edge of the polarizing beam splitter (19) abuts on the abutting surface (212). 6. The RGB three-color semiconductor laser projection display polarization beam splitting system according to claim 2, wherein the adjustment components (22) have four groups, which are arranged at four corners of the base (20) in sequence .

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