Laser illumination system for LCOS display platform

Abstract

The invention belongs to the technical field of laser illumination, and particularly relates to a laser illumination system for an LCOS display platform. The system comprises a first diffusion sheet, a collimation module, a light equalizing module, a third reflector, a relay lens module, a metal wire grating, a delay sheet, an LCOS chip and a polarization analyzer which are sequentially arranged from an LD light source illumination system to a lens. The collimating module comprises a double-sided compound eye, a first collimating lens, a first reflector, a second diffusion sheet, a second reflector and a second collimating lens which are sequentially installed between the diffusion sheet and the light equalizing module. The laser illumination system is provided with the collimation module and the light equalizing module, and the utilization rate and the display effect of the laser light source are further improved by optimizing the optical design and the light beam shaping technology, so that the display quality and the user experience can be remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of laser lighting, and in particular relates to a laser lighting system for an LCOS display platform. Background Art

[0002] With the continuous development of micro-projection display technology, the development of domestically produced LCOS chip micro-projection has become a mainstream market trend. Therefore, a series of products are developed for the HISILICON 0.37LCOS chip.

[0003] Among them, the LCOS chip is a reflective micro-display technology. It uses a CMOS integrated circuit chip coated with liquid crystal silicon as the substrate of the reflective LCD. LCOS places the control circuit behind the display device, which can improve the light transmittance, thereby achieving greater light output and higher resolution. LCOS technology has the advantages of high resolution, high brightness, and high contrast, and is widely used in micro-projection equipment. The laser lighting system is a lighting system that uses laser as a light source. It has the characteristics of high brightness, long life, and low power consumption, and is particularly suitable for micro-projection equipment. The laser lighting system can provide a stable light source, so that the micro-projection equipment can obtain clear and bright projection effects in various environments. Therefore, the development of a laser lighting system with LCOS chips as the core can significantly improve the performance of display equipment and meet users' needs for high-quality display effects.

[0004] However, because the light beam emitted by the laser light source has high directionality and coherence, this may cause interference and diffraction of the light beam during propagation, thereby affecting the uniformity of illumination on the projection surface. Therefore, the purpose of this application is to provide a laser lighting system that can improve the uniformity of point illumination on the projection surface. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a laser illumination system for an LCOS display platform.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A laser illumination system for an LCOS display platform, the system comprising a first diffuser, a collimator module, a light homogenizer module, a third reflector, a relay lens module, a metal wire grid, a delay plate, an LCOS chip and an analyzer arranged in sequence from an LD light source illumination system to a lens; The collimating module comprises a double-sided compound eye, a first collimating lens, a first reflector, a second diffuser, a second reflector and a second collimating lens which are sequentially installed between the diffuser and the light averaging module.

[0007] Furthermore, the convex surface of the first collimating lens is arranged close to the first diffuser; the plane of the first collimating lens is arranged close to the first reflector; the convex surface of the second collimating lens is arranged close to the second reflector, and the plane of the second collimating lens is arranged close to the light-homogenizing module.

[0008] Furthermore, the first reflector, the second reflector and the third reflector are all 45° laser reflectors.

[0009] Furthermore, the light-homogenizing module includes a first single-sided compound eye and a second single-sided compound eye which are arranged in sequence, the first single-sided compound eye is arranged close to the second collimating lens, and the second single-sided compound eye is arranged close to the third reflector.

[0010] Furthermore, the relay lens module includes a first relay lens and a second relay lens, the first relay lens is arranged close to the third reflector, and the second relay lens is arranged close to the metal wire grid; both sides of the first relay lens are convex, and both sides of the second relay lens are convex and flat respectively, and the convex surface of the second relay lens is arranged close to the first relay lens.

[0011] Furthermore, the metal wire grid is inclined at 45°.

[0012] The manufacturing cost of the laser lighting system is high, which limits its widespread application in the field of general consumer electronics. However, with the advancement of technology and the expansion of production scale, the cost of laser lighting systems is gradually decreasing. The laser lighting system proposed for the LCOS display platform can find suitable application scenarios in the high-end market, thereby promoting the development of technology and reducing costs. In addition, the brightness of the laser light source is very high, which may cause damage to the human eye in some application scenarios. The LCOS display platform is usually used in indoor environments, and the brightness requirements are relatively low. Therefore, the brightness and safety of the laser light source can be better controlled to ensure performance without causing harm to the user. The laser lighting system used for the LCOS display platform can also improve the stability and reliability of the system and extend its service life by optimizing the heat dissipation design and system integration.

[0013] The beneficial effects of the present invention are: The present invention provides a solution for a laser lighting system for an LCOS display platform. By using a first diffuser, a collimator module, a light-distributing module, a third reflector, a relay lens module, a metal wire grid, a delay plate and an LCOS chip, the illumination uniformity of the entire system is improved, and the illumination uniformity of the projection surface reaches 90%. Secondly, a metal wire grid is used instead of a prism to improve the contrast of the lighting system to 4000:1. In addition, an LD light source lighting system is used as a light source in the present application. The light angle of the entire system is small, the light efficiency is high, and the polarization state of the laser is adapted to the LCOS chip to reduce energy loss. And the laser light source has a very high brightness, which can significantly improve the image brightness of the LCOS display platform, so that a clear display effect can be obtained even in a bright environment. A collimator module and a light-distributing module are set in the lighting system, and the utilization rate and display effect of the laser light source are further improved by optimizing the optical design and beam shaping technology. Therefore, the laser lighting system for the LCOS display platform is an advanced technology with broad prospects, which can significantly improve the display quality and user experience. With the continuous advancement and improvement of technology, the application of laser lighting systems in LCOS display platforms will become more and more extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0015] Figure 1 : An optical system diagram of a laser illumination system for an LCOS display platform of the present invention.

[0016] Figure 2 : Light diagram of the optical system based on LIGHTTOOLS software.

[0017] Figure 3 :Light spot diagram of the optical system based on LIGHTTOOLS software on the effective surface of LCOS chip.

[0018] Figures indicate: 1: LD light source illumination system, 2: first diffuser, 3: double-sided compound eye, 4: first collimating lens, 5: first reflector, 6: second diffuser, 7: second reflector, 8: second collimating lens, 9: first single-sided compound eye, 10: second single-sided compound eye, 11: third reflector, 12: first relay lens, 13: second relay lens, 14: metal wire grid, 15: delay plate, 16: LCOS chip, 17: lens, 18: analyzer. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0020] like Figure 1-3 As shown, a laser illumination system for an LCOS display platform includes a first diffuser 2, a collimating module, a light-distributing module, a third reflector 11, a relay lens module, a metal wire grid 14, a delay plate 15, an LCOS chip 16, and an analyzer 18, which are sequentially arranged from the LD light source illumination system 1 to the lens 17. The collimating module includes a double-sided compound eye 3, a first collimating lens 4, a first reflector 5, a second diffuser 6, a second reflector 7, and a second collimating lens 8, which are sequentially installed between the diffuser and the light-distributing module. The convex surface of the first collimating lens 4 is arranged close to the first diffuser 2. The plane of the first collimating lens 4 is arranged close to the first reflector 5. The convex surface of the second collimating lens 8 is arranged close to the second reflector 7, and the plane of the second collimating lens 8 is arranged close to the light-distributing module. The first reflector 5, the second reflector 7, and the third reflector 11 are all 45° laser reflectors. The metal wire grid 14 is arranged at a 45° inclination. The light-homogenizing module includes a first single-sided compound eye 9 and a second single-sided compound eye 10 which are arranged in sequence. The first single-sided compound eye 9 is arranged close to the second collimating lens 8 , and the second single-sided compound eye 10 is arranged close to the third reflector 11 .

[0021] The relay lens module includes a first relay lens 12 and a second relay lens 13, the first relay lens 12 is arranged close to the third reflector 11, and the second relay lens 13 is arranged close to the metal wire grid 14; both sides of the first relay lens 12 are convex surfaces, and the two sides of the second relay lens 13 are respectively a convex surface and a flat surface, and the convex surface of the second relay lens 13 is arranged close to the first relay lens 12.

[0022] The above mechanisms work in sequence to form a laser illumination system for the LCOS display platform.

[0023] In this application, Figure 1 It can be seen that the light beam emitted by the LD light source illumination system 1 first passes through the first diffuser 2, the double-sided compound eye 3, the first collimating lens 4, the first reflector 5, the second diffuser 6, the second reflector 7, and the second collimating lens 8, and is transformed into a parallel collimated light beam.

[0024] The collimated light beam is evenly distributed through the even light module, and the light beam is divided into multiple thin light beams. The uniform distribution of light energy is achieved through the mutual superposition and compensation of these thin light beams. Then the light beam is refocused and adjusted through the relay lens module. The path and shape of the light beam can be changed through the relay lens to make it more suitable for subsequent optical processing. Then it is diffracted by the metal wire grid 14 to the LCOS chip 16. The light beam is modulated and reflected by the LCOS chip 16. After the light beam reaches the LCOS chip 16, the liquid crystal molecules on the LCOS chip 16 will change their arrangement according to the control of the electrical signal, thereby changing the phase and amplitude of the light beam. The light beam processed by the LCOS chip 16 is reflected and carries image information. The light beam carrying the image information passes through the metal wire grid 14 and turns to the analyzer 18. The analyzer 18 can filter the stray light in the light beam, avoid the influence of scattered light on the image quality, and improve the contrast of the image finally presented by the system. The light beam after passing through the analyzer 18 reaches the projection lens 17, and the projection lens 17 performs the final focusing and adjustment on the light beam so that it can form a clear image on the screen.

[0025] Figure 2 This application is combined Figure 1 The resulting optical system light diagram based on LIGHTTOOLS software. Figure 3 This is a light spot diagram of the optical system based on the LightTools software on the effective surface of the LCOS chip in this embodiment. The light spot diagram shows the distribution of light on the effective surface of the LCOS chip. It can be seen that the illumination uniformity of the lighting system is good.

[0026] This embodiment is a demonstration of an embodiment of the first collimating lens 4 and the second collimating lens 8 based on the embodiment 1.

[0027] The detailed parameters of the first collimating lens 4 and the second collimating lens 8 are as follows: Curvature radius R1 Curvature radius R2 thickness First collimating lens 4 76.998 0 2.97mm Second collimating lens 8 111.61 0 3mm This embodiment is a demonstration of an embodiment of the first relay lens 12 and the second relay lens 13 based on the embodiment 1.

[0028] The detailed parameters of the first relay lens 12 and the second relay lens 13 are as follows: Curvature radius R1 Curvature radius R2 thickness The first relay lens 12 105 -92.812 5.5mm Second relay lens 13 45 0 5.5mm The parameters of the first single-sided compound eye 9 and the second single-sided compound eye 10 are the same: R1=7.03, R2=INF. The first single-sided compound eye 9 and the second single-sided compound eye 10 are both composed of 10 columns*17 rows of small eyes.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A laser illumination system for an LCOS display platform, characterized in that: The system includes a first diffuser, a collimator module, a light-homogenizing module, a third reflector, a relay lens module, a metal wire grid, a delay plate, an LCOS chip and an analyzer, which are sequentially arranged from the LD light source illumination system to the lens; The collimating module comprises a double-sided compound eye, a first collimating lens, a first reflector, a second diffuser, a second reflector and a second collimating lens which are sequentially installed between the diffuser and the light averaging module.

2. A laser illumination system for an LCOS display platform according to claim 1, characterized in that: The convex surface of the first collimating lens is arranged close to the first diffuser; the plane of the first collimating lens is arranged close to the first reflector; the convex surface of the second collimating lens is arranged close to the second reflector, and the plane of the second collimating lens is arranged close to the light-homogenizing module.

3. A laser illumination system for an LCOS display platform according to claim 2, characterized in that: The first reflector, the second reflector and the third reflector are all 45° laser reflectors.

4. A laser illumination system for an LCOS display platform according to claim 3, characterized in that: The light-homogenizing module includes a first single-sided compound eye and a second single-sided compound eye which are arranged in sequence. The first single-sided compound eye is arranged close to the second collimating lens, and the second single-sided compound eye is arranged close to the third reflector.

5. A laser illumination system for an LCOS display platform according to claim 4, characterized in that: The relay lens module includes a first relay lens and a second relay lens, the first relay lens is arranged close to the third reflector, and the second relay lens is arranged close to the metal wire grid; both sides of the first relay lens are convex, and the two sides of the second relay lens are respectively a convex surface and a flat surface, and the convex surface of the second relay lens is arranged close to the first relay lens.

6. A laser illumination system for an LCOS display platform according to claim 5, characterized in that: The metal wire grid is inclined at 45°.

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