A laser illumination system for LCOS display platforms

Abstract

The application belongs to the technical field of laser illumination, and particularly relates to a laser illumination system for an LCOS display platform. The system comprises, in sequence from an LD light source illumination system to a lens, a first diffusion sheet, a collimation module, a uniform light module, a third mirror, a relay lens module, a metal wire grid, a retardation sheet, an LCOS chip and a polariscope. The collimation module comprises, in sequence, a double-face fly eye, a first collimation lens, a first mirror, a second diffusion sheet, a second mirror and a second collimation lens, which are installed between the diffusion sheet and the uniform light module. The laser illumination system provided by the application sets the collimation module and the uniform light module, and further improves the utilization rate of the laser light source and the display effect by optimizing the optical design and the beam shaping technology, so that the display quality and the user experience can be significantly improved.

Description

Technical Field

[0001] The present 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 the mainstream trend in the market. Therefore, a series of products are developed based on the HISILICON 0.37LCOS chip.

[0003] The LCOS chip is a reflective micro-display technology. It uses a CMOS integrated circuit chip coated with liquid crystal silicon as the substrate for the reflective LCD. LCOS places the control circuitry behind the display device, which can improve light transmittance, thereby achieving greater light output and higher resolution. LCOS technology has advantages such as high resolution, high brightness, and high contrast, and is widely used in micro-projection devices. The laser illumination system, on the other hand, is an illumination system that uses lasers as a light source. It has the characteristics of high brightness, long life, and low power consumption, making it particularly suitable for micro-projection devices. The laser illumination system can provide a stable light source, allowing micro-projection devices to achieve clear and bright projection effects in various environments. Therefore, the development of a laser illumination system with the LCOS chip as its core can significantly improve the performance of display devices and meet user demands for high-quality display effects.

[0004] However, because the beam emitted by a laser light source is highly directional and coherent, this can cause interference and diffraction during the beam's propagation, thereby affecting the uniformity of illumination on the projection surface. Therefore, the purpose of this application is to provide a laser illumination system that can improve the uniformity of 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:

[0007] A laser illumination system for an LCOS display platform, comprising 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.

[0008] The collimating module comprises a double-sided compound eye, a first collimating lens, a first reflecting mirror, a second diffuser, a second reflecting mirror and a second collimating lens, which are sequentially installed between the diffuser and the light-uniforming module.

[0009] 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.

[0010] Furthermore, the first reflector, the second reflector and the third reflector are all 45° laser reflectors.

[0011] Furthermore, the light-homogenizing module includes a first single-sided compound eye and a second single-sided compound eye 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.

[0012] 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 surfaces of the first relay lens are convex, and the two surfaces 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.

[0013] Furthermore, the metal wire grid is tilted at 45°.

[0014] The high manufacturing cost of laser lighting systems has limited their widespread application in general consumer electronics. However, with technological advancements and the expansion of production scale, the cost of laser lighting systems is gradually decreasing. The proposed laser lighting system for LCOS display platforms can find suitable application scenarios in the high-end market, thereby promoting technological development and cost reduction. In addition, the brightness of laser light sources is very high, which may cause damage to the human eye in certain application scenarios. LCOS display platforms are usually used in indoor environments and have relatively low brightness requirements. Therefore, the brightness and safety of laser light sources can be better controlled to ensure performance without causing harm to users. Laser lighting systems for LCOS display platforms can also improve the stability and reliability of the system and extend its service life by optimizing heat dissipation design and system integration.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a solution for a laser illumination 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, the use of a metal wire grid instead of a prism increases the contrast of the illumination system to 4000:1. In addition, the present application uses an LD light source illumination system as the light source. The entire system has a small light angle and high light efficiency. The laser polarization state is adapted to the LCOS chip, reducing energy loss. The laser light source has very high brightness and can significantly improve the image brightness of the LCOS display platform, so that a clear display effect can be obtained even in bright environments. A collimator module and a light-distributing module are set in the illumination 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 illumination 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 illumination systems in LCOS display platforms will become more and more extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 : An optical system diagram of a laser illumination system for an LCOS display platform of the present invention.

[0019] Figure 2 : Light diagram of the optical system based on LIGHTTOOLS software.

[0020] Figure 3 : Light spot diagram of the optical system based on LIGHTTOOLS software on the effective surface of the LCOS chip.

[0021] Figure 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

[0022] In order to better understand the present invention, the content of the present invention is further clearly set forth below in conjunction with the examples, but the protection content of the present invention is not limited to the following examples. 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.

[0023] 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 arranged in sequence 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 near the first diffuser 2. The flat surface of the first collimating lens 4 is arranged near the first reflector 5. The convex surface of the second collimating lens 8 is arranged near the second reflector 7, and the flat surface of the second collimating lens 8 is arranged near 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 inclined at 45°. The light-homogenizing module includes a first single-sided compound eye 9 and a second single-sided compound eye 10 that are sequentially arranged. 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 .

[0024] 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 surfaces of the first relay lens 12 are convex, and the two surfaces of the second relay lens 13 are respectively a convex surface and a flat surface. The convex surface of the second relay lens 13 is arranged close to the first relay lens 12.

[0025] The above mechanisms act in sequence to form a laser illumination system for the LCOS display platform.

[0026] 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 converted into a parallel collimated light beam.

[0027] The collimated light beam passes through the light-homogenizing module, where it is split into multiple fine beams. These fine beams are then superimposed and compensated for to achieve uniform distribution of light energy. The beam is then refocused and adjusted by the relay lens module, which changes its path and shape, making it more suitable for subsequent optical processing. The beam is then diffracted by the wire grid 14 onto the LCOS chip 16. The LCOS chip 16 modulates and reflects the light beam. Upon reaching the chip 16, the liquid crystal molecules on the chip change their arrangement according to the electrical signal, thereby altering the phase and amplitude of the beam. The processed light beam is then reflected and carries the image information. The image-carrying light beam passes through the wire grid 14 and is directed to the analyzer 18, which filters stray light from the beam, preventing scattered light from affecting image quality and improving the contrast of the final image presented by the system. After passing through the analyzer 18, the beam reaches the projection lens 17, which performs the final focusing and adjustment to form a clear image on the screen.

[0028] Figure 2 This application is combined Figure 1 The optical system light diagram obtained based on LIGHTTOOLS software. Figure 3 This is the 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.

[0029] 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.

[0030] The detailed parameters of the first collimating lens 4 and the second collimating lens 8 are as follows:

[0031] Curvature radius R1 Curvature radius R2 thickness First collimating lens 4 76.998 0 2.97mm Second collimating lens 8 111.61 0 3mm

[0032] This embodiment is based on the first embodiment and shows an embodiment of the first relay lens 12 and the second relay lens 13.

[0033] The detailed parameters of the first relay lens 12 and the second relay lens 13 are as follows:

[0034] Curvature radius R1 Curvature radius R2 thickness First relay lens 12 105 -92.812 5.5mm Second relay lens 13 45 0 5.5mm

[0035] 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 ommatidia.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this 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 first diffuser and the light-homogenizing module; The convex surface of the first collimating lens is disposed close to the first diffuser; the plane of the first collimating lens is disposed close to the first reflector; the convex surface of the second collimating lens is disposed close to the second reflector, and the plane of the second collimating lens is disposed close to the light-uniforming module; The first reflector, the second reflector and the third reflector are all 45° laser reflectors; The light-homogenizing module includes a first single-sided compound eye and a second single-sided compound eye arranged in sequence, wherein 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; The relay lens module includes a first relay lens and a second relay lens, wherein the first relay lens is disposed near the third reflector, and the second relay lens is disposed near the metal wire grid; both surfaces of the first relay lens are convex, and both surfaces of the second relay lens are convex and flat, respectively, and the convex surface of the second relay lens is disposed near the first relay lens; the metal wire grid is disposed at a 45° inclination; By using the first diffuser, collimating module, light-homogenizing module, third reflector, relay lens module, metal wire grid, delay plate and LCOS chip, the illumination uniformity of the system is improved, and the illumination uniformity of the projection surface reaches 90%; by using the metal wire grid instead of the prism, the contrast of the lighting system is improved to 4000:1.

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