Projection system

Abstract

The utility model relates to the technical field of projection optical systems, in particular to a projection system, which comprises a first light source assembly, a second light source assembly, a DMD chip and a lens, first light emitted by the first light source assembly and second light emitted by the second light source assembly respectively enter the DMD chip from different directions, micromirror units in the DMD chip guide the first light and the second light to the lens to be emitted when in different states, at least one of the first light source assembly and the second light source assembly comprises a plurality of light source subunits arranged side by side, and dodging is carried out through a dodging element. The projection system provided by the utility model weakens or homogenizes dark areas generated by gaps between the adjacent light source subunits, improves the uniformity of emergent light, solves the problem of non-uniform brightness of a projection picture, and improves the quality of the projection picture.

Description

Technical Field

[0001] The utility model relates to the technical field of projection optical systems, in particular to a projection system. Background Art

[0002] The light source is an important component of the projection system. Currently, the commonly used light sources mainly include LED light sources, laser light sources, and fluorescent excitation light sources. In order to improve the projection brightness, a common method includes setting up multiple sub-light sources to improve the illumination brightness of the light source. For example, the laser light source uses multiple laser diodes arranged in an array, and the LED light source uses multiple lamp beads chips arranged side by side. Usually, there is a certain degree of gap between adjacent sub-light sources. The light emitted by the light source as a whole is prone to dark areas between adjacent sub-light sources, and the light quality and color uniformity are poor, which can easily lead to uneven brightness of the projection picture, affecting the quality of the projection picture. Utility Model Content

[0003] The technical problem to be solved and the technical task proposed by the utility model are to improve the existing technology and provide a projection system to solve the problem that the projection system in the current technology easily causes uneven brightness of the projection picture when using multiple sub-light sources.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A projection system comprises a first light source assembly, a second light source assembly, a DMD chip and a lens, wherein the first light emitted by the first light source assembly is emitted to the DMD chip along a first direction, and when a micromirror unit in the DMD chip is in a first state, the first light is guided to a light-exiting optical path so as to be emitted from the lens, and the second light emitted by the second light source assembly is emitted to the DMD chip along a second direction, and when the micromirror unit in the DMD chip is in a second state, the second light is guided to a light-exiting optical path so as to be emitted from the lens;

[0006] At least one of the first light source assembly and the second light source assembly comprises a plurality of light source sub-units arranged side by side, and a light homogenizing element is arranged on an outgoing light path of the light source sub-units.

[0007] The projection system of the utility model can improve the brightness of the illumination light by arranging several light source sub-units side by side, has a compact structure, occupies a small space, is easy to implement, and has good structural stability. The light emitted by the several light source sub-units arranged side by side is evenly processed by using an even light element, and the dark area generated by the gap between adjacent light source sub-units is weakened or evenly distributed, so as to improve the uniformity of light output, thereby solving the problem of uneven brightness of the projection picture and improving the quality of the projection picture. In addition, the projection system of the utility model makes full use of the DMD chip, and effectively utilizes the micromirror unit when it is in the off state. The first state and the second state of the micromirror unit correspond to the traditional on state and the off state. The micromirror unit is in the first state relative to the micromirror unit in the second state, which means that the micromirror unit has tilted. The micromirror unit is in different states to reflect and guide the light from different directions to the same direction output, so as to fully and effectively utilize the various states of the micromirror unit. Two optical channels share one DMD chip, which has a compact structure, occupies a small volume, has low implementation cost, and has high economic value.

[0008] Furthermore, a collimator is provided on the outgoing light path of the light source subunit, and the light homogenizing element is provided between the light source subunit and the collimator and / or on the outgoing light path of the collimator. The collimator can effectively collect light, improve the directionality of light propagation along the light path, improve the utilization rate of light, and thus improve the brightness and quality of the outgoing light. The light homogenizing process can be performed first and then the collimation, or the light homogenizing process can be performed first and then the collimation.

[0009] Furthermore, the collimating device is an aspherical lens, which can better collimate the light and is helpful for correcting distortion and phase difference during projection, thereby improving the quality of the projected image.

[0010] Furthermore, the light homogenizing element includes a light homogenizing sheet with a microstructure on one side, a light homogenizing sheet with a microstructure on both sides, or a combination of two light homogenizing sheets with a microstructure on one side. The structure is simple and compact, and the light homogenizing effect is good. After the light passes through the light homogenizing sheet, it is diverged, effectively weakening or homogenizing the dark area caused by the gap between adjacent light source subunits, and improving the light output quality.

[0011] Furthermore, the light source sub-units are arranged in a straight line, and the microstructure includes micro-prisms whose length direction is perpendicular to the arrangement direction of the light source sub-units, and a plurality of micro-prisms are arranged along the arrangement direction of the light source sub-units. The structure is simple, easy to implement, and has a good light homogenization effect. Effective light homogenization can be performed in the arrangement direction of the light source sub-units, thereby reducing or eliminating the dark area caused by the gap between adjacent light source sub-units, improving the uniformity of light output, and improving the light output quality.

[0012] Furthermore, the first light source assembly includes a plurality of color light units of different colors to obtain the first light through the light combining assembly, the second light source assembly includes a light source 2 that directly emits the second light, the second light is white light, and at least one of the color light unit and the light source 2 includes a plurality of light source sub-units arranged side by side. The projection system described in the utility model is suitable for a vehicle light projection system, which can not only perform driving lighting, but also perform black and white image projection display, and further perform color image projection display, realizing a variety of projection modes in different forms, with rich and diverse functions, and avoiding the risks caused by the synthesis of multiple color lights, thereby improving driving safety.

[0013] Furthermore, the light source subunit is an LED unit or a laser unit, which has a simple and compact structure and is easy to implement.

[0014] Furthermore, the first light emitted by the first light source assembly is guided by the first guide member along a first direction to the DMD chip, and the second light emitted by the second light source assembly is guided by the second guide member along a second direction to the DMD chip;

[0015] The first guiding member and / or the second guiding member is a reflective element with a free-form surface;

[0016] Alternatively, the first guiding member and / or the second guiding member comprises a converging lens and a planar reflector arranged on the optical path.

[0017] The guiding components 1 and 2 mainly play the role of converging and guiding, respectively converging the light and then guiding it to the DMD chip. When a free-form surface reflective element is used, the structure is more streamlined and compact. The free-form surface reflective element plays the role of converging and reflecting and guiding at the same time, occupies a small space, and is beneficial to reducing the optical and mechanical volume of the car light projection system. When a converging lens and a flat reflective component are used, the components are easy to implement and manufacture with low cost. The converging lens plays a converging role, while the flat reflective component plays a reflecting and guiding role.

[0018] Furthermore, the guide member 1 and the guide member 2 are respectively located on both sides of the light-emitting optical path to guide the light to the DMD chip at an angle, and a light-through notch is provided on the side of the reflective element close to the light-emitting optical path, and the diameter of the light-through notch is 10 to 30 mm. The structure is compact and occupies a small space. The light modulated by the DMD chip has a certain degree of divergence angle. In order to avoid the light emitted by the DMD chip being blocked by the reflective element and causing light loss, a light-through notch is provided on the reflective element to ensure that the light modulated by the DMD chip is fully emitted and the brightness of the light is improved.

[0019] Furthermore, the first direction is an angle range of 22 to 38 degrees for the first light to enter the DMD chip, and the second direction is an angle range of -38 to -22 degrees for the second light to enter the DMD chip.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The projection system described in the utility model can effectively homogenize the light emitted by the light source, weaken or homogenize the dark area generated by the gap between adjacent light source sub-units, improve the uniformity of light emission, solve the problem of uneven brightness of the projection picture, improve the quality of the projection picture, and can make full use of the DMD chip. Two optical channels share one DMD chip for co-directional projection, and effectively utilize the micromirror unit when it is in the off state. It has a compact structure, small occupied volume, low implementation cost and high economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a projection system of the utility model;

[0023] Figure 2 It is a structural schematic diagram of another projection system of the utility model;

[0024] Figure 3 It is a structural schematic diagram of another projection system of the utility model;

[0025] Figure 4 is a structural schematic diagram of a light homogenizing element;

[0026] Figure 5 is a schematic diagram of the structure of another light homogenizing element;

[0027] Figure 6 is a schematic diagram of the structure of another light homogenizing element;

[0028] Figure 7 A schematic diagram of an arrangement structure of light source subunits;

[0029] Figure 8 is a structural schematic diagram of a light homogenizing element;

[0030] Fig. 9 is a schematic diagram of another arrangement structure of the light source sub-unit;

[0031] Fig.10 It is a schematic diagram of the overall structure of another projection system of the utility model;

[0032] Fig.11 This is a structural schematic diagram of a second light source assembly of the utility model;

[0033] Fig.12It is a structural schematic diagram of another second light source assembly of the utility model;

[0034] Fig.13 This is a structural schematic diagram of a first light source assembly of the utility model;

[0035] Fig.14 It is a structural schematic diagram of another first light source assembly of the utility model;

[0036] Fig.15 It is a schematic diagram of the structure of another first light source assembly and a second light source assembly cooperating with a DMD chip of the utility model.

[0037] In the figure:

[0038] The first light source assembly 1, the light source sub-unit 101, the light homogenizing element 102, the micro-prism 1021, the collimating device 103, the color light unit 11, the lens unit 1 111, the light combining assembly 12, the dichroic mirror 1 121, the dichroic mirror 2 122, the dichroic mirror 3 123, the dichroic mirror 4 124, the guiding member 13, the light-through gap 131, the second light source assembly 2, the light source 21, the sub-light source 211, the lens unit 212, the guiding member 22, the converging lens 221, the reflector 222, the DMD chip 3, the lens 4, the first lens 41, the second lens 42, the third lens 43, the fourth lens 44, and the fifth lens 45. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The utility model discloses a projection system which performs light homogenization processing on a light source having a plurality of sub-light sources arranged side by side, thereby improving chromaticity uniformity, avoiding uneven brightness of a projection picture, improving the quality of the projection picture, and effectively utilizing different states of a micromirror unit in a DMD chip to realize multifunctional projection, with a compact structure and a small occupied volume.

[0041] like Figure 1As shown, the projection system mainly includes a first light source assembly 1, a second light source assembly 2, a DMD chip 3 and a lens 4. The first light emitted by the first light source assembly 1 is emitted to the DMD chip 3 along a first direction. When the micromirror unit in the DMD chip 3 is in a first state, the first light is guided to the light-exiting optical path so as to be emitted from the lens 4. The second light emitted by the second light source assembly 2 is emitted to the DMD chip 3 along a second direction. When the micromirror unit in the DMD chip 3 is in a second state, the second light is guided to the light-exiting optical path so as to be emitted from the lens 4. In the projection system described in this embodiment, the first light emitted by the first light source assembly 1 and the second light emitted by the second light source assembly 2 are both emitted to the same DMD chip 3. The first light and the second light are respectively inclined to the DMD chip 3 in different directions. The DMD chip 3 includes a plurality of micromirror units arranged in an array. The micromirror unit is equivalent to a pixel point of a picture. Each micromirror unit is a small reflector that can be independently tilted and adjusted. By tilting and adjusting each micromirror unit, the emission direction of the light reflected by the micromirror unit can be changed. In a conventional projection system, when the micromirror unit in the DMD chip is in the off state, the pixel corresponding to the micromirror unit has no light output. The micromirror unit in the DMD chip is not effectively utilized when it is in the off state. If two different light channels are to be output, two projection systems need to be set up, which means that two sets of DMD chips and two sets of light sources need to be set up respectively, which has a complex structure, occupies a large volume, and has a high cost. The projection system described in this embodiment makes full use of the DMD chip 3 and also makes full use of the micromirror unit when it is in the off state. Specifically, the micromirror unit in this embodiment is in the first state, which corresponds to the conventional micromirror unit being in the on state, and the micromirror unit in this embodiment is in the second state, which corresponds to the conventional micromirror unit being in the off state. In other words, the micromirror unit in this embodiment is in the first state relative to the micromirror unit being in the second state, which means that the micromirror unit has tilted, and the micromirror unit in the second state is in a different tilt state from the micromirror unit in the first state. posture, so that the micromirror unit can reflect and guide light from different directions to the same direction output when it is in different states, that is, when the micromirror unit is in the tilted posture of the first state, the first light will be reflected by the micromirror unit and guided to the light output path where the lens 4 is located after it is incident on the micromirror unit, and when the micromirror unit is deflected to the tilted posture of the second state, the second light will be reflected by the micromirror unit and guided to the light output path where the lens 4 is located after it is incident on the micromirror unit, thereby making full and effective use of each state of the micromirror unit, and the two light sources share one DMD chip 3, with a compact structure, small occupied volume, low implementation cost and high economic value.

[0042] The first light source component 1 and the second light source component 2 can be light sources that combine multiple colors of light, for example, a light source that combines red light, green light and blue light. The first light source component 1 and the second light source component 2 can also be light sources of different colors, for example, the first light source component 1 is a red light source, and the second light source component 2 is a green light source. The first light source component 1 and the second light source component 2 can be set as needed to meet different needs. A single DMD chip is mainly used to realize light output from two different optical channels. The structure is compact, the volume is small, and the implementation cost is low.

[0043] Further, such as Figure 1 As shown, the first light source assembly 1 and the second light source assembly 2 are distributed as a whole on both sides of the light output path of the DMD chip 3. The first light emitted by the first light source assembly 1 is incident on the DMD chip 3 at an angle, and the second light emitted by the second light source assembly 2 is incident on the DMD chip 3 at an angle from another direction. When the micromirror unit in the DMD chip 3 changes from a first state to a second state, the micromirror unit changes its tilting state, thereby guiding the first light and the second light from different directions to the same light output path for output. The first light incident on the DMD chip and the second light incident on the DMD chip are symmetrically distributed on both sides of the light output path of the DMD chip. Specifically, the angle range of the first light incident on the DMD chip 3 is controlled in the range of 22 to 38°, and the angle range of the second light incident on the DMD chip 3 is controlled in the range of -38 to -22°. The angle of the first light incident on the DMD chip 3 specifically refers to the incident angle of the first light relative to the center line of the surface of the DMD chip 3 (optical axis of the lens 4), and the angle of the second light incident on the DMD chip 3 specifically refers to the incident angle of the second light relative to the center line of the surface of the DMD chip 3 (optical axis of the lens 4). Therefore, when the micromirror unit changes state, the light can be reflected and guided to be emitted roughly along the center line direction of the DMD chip 3, that is, the light output path of the DMD chip 3 is along the center line direction of the DMD chip 3. In order to ensure that the lens 4 can collect enough incident light, the optical path spacing from the DMD chip to the lens 4 is 32 to 40 mm.

[0044] like Figure 2As shown, the first light source assembly and / or the second light source assembly include a plurality of light source sub-units 101 arranged side by side. The light source sub-units 101 may specifically be LED units or laser units, which can improve the brightness of the lighting, have a compact structure, occupy a small space, and are easy to implement. A light homogenizing element 102 is provided on the outgoing light path of the light source sub-unit 101, and the light homogenizing element 102 is used to homogenize the light emitted by the plurality of light source sub-units 101 arranged side by side, and the dark areas generated by the gaps between adjacent light source sub-units 101 are weakened or homogenized, thereby improving the uniformity of the light output, thereby solving the problem of uneven brightness of the projection picture and improving the quality of the projection picture. Furthermore, a collimating device 103 is provided on the outgoing light path of the light source sub-unit 101, so as to improve the directionality of light propagation along the light path, improve the utilization rate of light, and thereby improve the brightness and quality of the light output. Preferably, the collimating device 103 is a non-spherical lens, which can better collimate the light, and is helpful in correcting distortion and phase difference during projection, thereby improving the quality of the projection picture. As shown Figure 2 As shown, the light homogenizing element 102 can be specifically arranged between the light source subunit 101 and the collimating device 103, or as shown in Figure 3 As shown, the light homogenizing element 102 can be specifically arranged on the outgoing light path of the collimating device 103, or, the light homogenizing element 102 can be specifically arranged between the light source subunit 101 and the collimating device 103 and on the outgoing light path of the collimating device 103. The light homogenizing element 102 between the light source subunit 101 and the collimating device 103 is closer to the light source subunit 101, and can perform light homogenization from the light emission source, so as to better weaken or homogenize the dark area caused by the gap between adjacent light source subunits 101, thereby improving the light homogenization effect. The light homogenizing element 102 can be a diffuser, a compound eye lens, a light homogenizing sheet with a microstructure, etc. More specifically, the light homogenizing element 102 can be as follows Figure 4 The single side of the light homogenizer is provided with a microstructure, such as Figure 5 The double-sided light-homogenizing sheet with microstructures as shown or Figure 6 One of the combinations of two light homogenizing sheets with microstructures on one side shown is flexibly arranged as needed while ensuring the homogenizing effect. When the light source subunit 101 is an LED unit, the divergence angle of the light emitted by the LED unit is large, so the size of the light spot formed is large, and there is no need to perform beam expansion processing. The light emitted by the LED unit can be directly processed by the homogenizing element 102. When the light source subunit 101 is a laser unit, the light energy density emitted by the laser unit is high and the directionality is good, and the size of the light spot formed is small. A beam expansion element can be arranged on the light incident side of the homogenizing element 102 to expand the light emitted by the laser unit, increase the size of the light spot, and obtain uniform light output over a large area.

[0045] like Figure 7As shown, the light source subunits 101 are arranged along a straight line. Figure 8 As shown, the microstructure includes microprisms 1021 whose length direction is perpendicular to the arrangement direction of the light source subunits 101, and a plurality of microprisms 1021 are arranged along the arrangement direction of the light source subunits 101. There is a certain gap between adjacent light source subunits 101 in the linear arrangement direction of the light source subunits 101, and thus the light emitted by the first light source assembly and / or the second light source assembly as a whole is prone to uneven brightness in the linear arrangement direction of the light source subunits 101, that is, a dark field area will be formed at the position corresponding to the gap between adjacent light source subunits 101, and the light output uniformity is poor, thereby affecting the quality of the projected image. Since the light source subunits 101 are arranged along a straight line, the uneven brightness condition occurs in the linear arrangement direction of the light source subunits 101, and thus it is mainly necessary to perform uniform light in the linear arrangement direction of the light source subunits 101 to improve the uniformity of the light output in the linear arrangement direction of the light source subunits 101. Furthermore, when a plurality of micro-prisms 1021 whose length direction is perpendicular to the arrangement direction of the light source sub-units 101 are arranged along the arrangement direction of the light source sub-units 101, light homogenization can be effectively performed in the linear arrangement direction of the light source sub-units 101. The cross-section of the micro-prisms 1021 is a convex lens structure, which can make the light passing through the micro-prisms 1021 diverge in the linear arrangement direction of the light source sub-units 101, thereby effectively achieving light homogenization, and no light homogenization processing is required in the linear arrangement direction perpendicular to the light source sub-units 101. In addition, as Fig. 9 As shown, the light source subunits 101 are arranged in an array, for example, in an array distributed vertically and horizontally, and the microstructure can be a microlens unit arranged in an array, then the light homogenizing element is a compound eye lens, so that the light homogenizing element can perform light homogenization in multiple directions, and the microlens unit is a convex lens structure, which can make the light passing through the microlens unit diverge, thereby effectively achieving light homogenization. For the implementation of the light homogenizing element 102 being a compound eye lens or a light homogenizing sheet with a microstructure, when the light homogenizing element 102 is arranged between the light source subunit 101 and the collimating device 103, it is preferred that when the light emitted by the light source subunit 101 passes through the light homogenizing element 102, the light is focused on the vertex of the microstructure of the light homogenizing element 102 (that is, the microlens unit of the compound eye lens and the microprism of the light homogenizing sheet), so that the light can be more effectively diverged when it is emitted from the light homogenizing element 102 for light homogenization mixing, thereby better improving the light homogenization effect.

[0046] In a preferred embodiment, the projection system is applied in the automotive field as a vehicle light projection system, wherein Fig.10As shown, the first light source assembly 1 includes a plurality of color light units 11 of different colors to synthesize the first light through the light combining assembly, and the second light source assembly 2 includes a second light source 21 that directly emits the second light, and the second light is white light, that is, the first light includes a plurality of color lights, and when each color light unit 11 is working, the first light can be presented as white light, and the second light source 21 directly emits white light. It can not only perform driving lighting, but also perform black and white image projection display, and further perform color image projection display, realizing a variety of projection modes in different forms, with rich and diverse functions, and avoiding the risks caused by the synthesis of multiple color lights, thereby improving driving safety.

[0047] Further, such as Fig.11 As shown, the light source 21 mainly includes a sub-light source 211 and a lens unit 212. Several sub-light sources 211 are arranged side by side, which can increase the luminous power and improve the light brightness as needed. One of the main functions of the second light emitted by the second light source assembly 2 is for driving lighting. Arranging multiple sub-light sources 211 side by side can effectively increase the light brightness. The sub-light source 211 directly adopts a light source that emits white light, such as a white light LED. Specifically, a sub-light source 211 with three white light LEDs can be used. The overall light output is 4000lm~5000lm, and the light color is a white light 6000K color temperature spectrum, which meets the needs of driving lighting. There are several corresponding lens units 212, and lens units 212 are collimating devices. Each sub-light source 211 is collimated by the corresponding lens unit 212 and then emitted to the guide component 22. The guide component 22 guides the light along the second direction to the DMD chip 3. The light emitted by the LED sub-light source 211 has a large divergence angle. The lens unit 212 is used to collect and collimate the light, thereby improving the utilization rate of light, reducing light loss, and improving the brightness of light. Several lens units 212 can be connected as a whole, that is, an integral optical device has several curved surfaces thereon to form each lens unit 212, with good structural stability and good integrity, or each lens unit 212 is an independent component, that is, each lens unit 212 is an independent lens, with a simpler structure and easy processing and implementation. Furthermore, the lens unit 212 is an aspherical lens with a diameter of 10-15 mm, which can collimate the half-intensity full angle of the light beam to within 20-5°, can better collimate the light, and is beneficial for correcting distortion and phase difference during projection, thereby improving the quality of the projection image.

[0048] like Fig.10 and Fig.11As shown, the guiding member 22 is a free-form reflective element with a reflectivity of 90%-98%, so as to efficiently guide the second light to the DMD chip 3 by reflection. The free-form reflective element plays the role of convergence and reflection guidance at the same time, has a compact structure, occupies a small volume, and is conducive to reducing the optical and mechanical volume of the projection system. In a specific embodiment, the distance from the sub-light source 211 to the free-form reflective element is 18 to 25 mm, and the distance from the free-form reflective element to the DMD chip 3 is 29 to 35 mm. In addition, it can also be as follows Fig.12 As shown, the second guiding member 22 can also be composed of a converging lens 221 and a planar reflector 222 arranged on the optical path. The structure is simple and easy to implement. The converging lens 221 plays a converging role, while the planar reflector 222 plays a reflective guiding role. The functions of converging and reflecting guiding are separated and completed by different components respectively. The implementation is convenient and the cost is low. Relatively speaking, the occupied volume is increased compared with the previous method. In a specific implementation, the diameter of the converging lens 221 is 15 to 23 mm, the distance from the converging lens 221 to the lens unit 212 is 2 to 6 mm, and the distance from the converging lens 221 to the planar reflector 222 is 7 to 18 mm.

[0049] When the second guiding member 22 is a reflective element with a free-form surface, the optical parameters of each component in the second light source assembly 2 are as shown in Table 1.

[0050] Table 1

[0051]

[0052]

[0053] The second guiding member 22 is a polynomial free-form surface, and the second lens unit 212 is an aspherical lens. The polynomial free-form surface formula is:

[0054]

[0055] In the formula, parameter c is the curvature corresponding to the radius, r is the radial height, and k is the conic coefficient ConicConstant.

[0056] Coefficient A i E i At X1Y0: 0

[0057] Coefficient A i E i At X0Y1: -0.28803285

[0058] Coefficient A i E iAt X2Y0: -0.0031512576

[0059] Coefficient A i E i At X1Y1: 0

[0060] Coefficient A i E i At X0Y2: -0.0071475263

[0061] Coefficient A i E i At X3Y0: 0

[0062] Coefficient A i E i At X2Y1: -0.00021149853

[0063] Coefficient A i E i At X1Y2: 0

[0064] Coefficient A i E i At X0Y3: -7.9956701e-05

[0065] Coefficient A i E i At X4Y0: -4.2887933e-06

[0066] Coefficient A i E i At X3Y1: 0

[0067] Coefficient A i E i At X2Y2: 8.4684368e-06

[0068] Coefficient A i E i At X1Y3: 0

[0069] Coefficient A i E i At X0Y4: 3.1255176e-05 coefficient A i E i At X5Y0: 0 coefficient A i E i At X4Y1: -1.4651785e-07 coefficient A i E i At X3Y2: 0 coefficient A i E i At X2Y3: 1.6972963e-06 coefficient Ai E i When X1Y4: 0 coefficient A i E i At X0Y5: -1.9941238e-06 coefficient A i E i At X6Y0: 6.7997809e-09 coefficient A i E i At X5Y1: 0 coefficient A i E i At X4Y2: -3.891408e-08 coefficient A i E i At X3Y3: 0 coefficient A i E i At X2Y4: -1.3897491e-07 coefficient A i E i At X1Y5: 0 coefficient A i E i At X0Y6: -2.0451796e-07 Coefficient A i E i At X7Y0: 0 coefficient A i E i At X6Y1: 1.1435992e-09 coefficient A i E i At X5Y2: 0 coefficient A i E i At X4Y3: -1.8504103e-09 coefficient A i E i At X3Y4: 0 coefficient A i E i At X2Y5: -2.2342817e-08 Coefficient A i E i When X1Y6: 0 coefficient A i E i At X0Y7: 1.2282326e-08 The aspheric formula is:

[0070]

[0071] In the formula, parameter c is the curvature corresponding to the radius, r is the radial height of the lens, k is the conic coefficient ConicConstant, and α1 to α8 are the aspheric coefficients corresponding to the 2nd to 16th order, respectively:

[0072] Coefficient of r^2 α1: 0

[0073] Coefficient α2 of r^4: -0.005321859

[0074] Coefficient α3 of r^6: 0.0008448839

[0075] Coefficient α4 of r^8: -6.8908737e-05

[0076] R^10 coefficient α5: 2.8644874e-06

[0077] Coefficient of r^12 α6: -5.842179e-08

[0078] Coefficient of r^14 α7: 4.6870249e-10

[0079] The coefficient of r^16 is α8:0

[0080] The light combining component 12 of the first light source component 1 mainly includes a dichroic mirror that reflects or transmits light from one of the color light units 11, and a plurality of the dichroic mirrors cooperate to combine the light emitted by each color light unit. Fig.13 As shown, the dichroic mirrors are arranged in an X shape, and the color light units 11 are specifically provided with three types, including a red color light unit, a green color light unit, and a blue color light unit. The three color light units 11 specifically use LED light sources, namely red light LED, green light LED, and blue light LED. Of course, the three color light units 11 can also use LD light sources. The light emitted by the three color light units 11 is guided by reflection or transmission of the dichroic mirror to perform efficient light combination, and finally the light combination obtains white light. In a specific embodiment, the red color light unit, the green color light unit, and the blue color light unit can respectively include a plurality of light source sub-units arranged side by side, so as to improve the illumination brightness of the color light, with a compact structure, small space occupation, and easy implementation. For LED light sources, the light source sub-units are specifically LED lamp bead chips, and the LED lamp bead chips can be arranged along a straight line or in a matrix as needed. Similarly, for LD light sources, the light source sub-units are specifically laser diodes, and the laser diodes can be arranged along a straight line or in an array as needed.

[0081] Specific as Fig.13As shown, the dichroic mirror 1 121 and the dichroic mirror 2 122 are combined to form an X shape, wherein the dichroic mirror 1 121 reflects red light and transmits green light and blue light, while the dichroic mirror 2 122 reflects blue light and transmits green light and red light. The red light color light unit, the green light color light unit and the blue light color light unit are arranged at corresponding specific positions. Through the guidance of the dichroic mirror 1 121 and the dichroic mirror 2 122, the three color lights can be emitted in the same direction to combine the light. The specific positions of the color light units 11 can be adjusted and interchanged, and the transmissive and reflective characteristics of the dichroic mirror 1 121 and the dichroic mirror 2 122 can be adjusted accordingly. In addition, it is also possible to Fig.14 As shown, the red light unit and the green light unit are first combined through the dichroic mirror three 123, the dichroic mirror three 123 transmits red light and reflects blue light, and then the combined light beam of red light and blue light is set to the dichroic mirror four 124, and the blue light unit is emitted to the dichroic mirror four 124, the dichroic mirror four 124 transmits red light and green light and reflects blue light, so as to finally combine the light to obtain a white first light, and then the first light is emitted to the guiding component one 13 to be guided by the guiding component one 13 along the first direction to the DMD chip 3, and the first light is modulated by the DMD chip 3 and emitted from the lens 4. In addition, the light combining component 12 may also use other devices, such as a reflective device with a hole. The red light emitted by the red light color unit is reflected and guided out by the reflective device with a hole, while the green light emitted by the green light color unit enters the reflective device with a hole from the other side and passes through the hole and is emitted in the same direction as the reflected red light to combine the lights. By analogy, white light can also be obtained by combining the lights.

[0082] Furthermore, a collimating device is respectively arranged on the output light path of each color light unit 11, and the collimating device is specifically a lens unit 111 for collimation. The lens unit 111 is an aspherical lens. Each color light unit 11 can adopt an LED light source, and the emitted light has a large divergence angle. The lens unit 111 is used to collect and collimate the light, thereby improving the utilization rate of light, reducing light loss, and improving the brightness of the light.

[0083] Further, such as Fig.13As shown, the guide member 13 in the first light source assembly 1 can also be a reflective element with a free-form surface, and its reflectivity is 90%-98%, so as to efficiently guide the first light to the DMD chip 3 by reflection. The reflective element with a free-form surface plays the role of convergence and reflection guidance at the same time, has a compact structure, occupies a small volume, and is conducive to reducing the optical and mechanical volume of the projection system. In a specific embodiment, the distance from the guide member 13 to the DMD chip 3 is 33-40 mm. Furthermore, the guide member 13 and the guide member 22 are respectively located on both sides of the light output path to guide the light obliquely to the DMD chip 3 respectively. The structure is simple and compact, and the space is fully utilized to reduce the occupied volume. Since the light output path of the DMD chip 3 passes between the guide member 13 and the guide member 22, and the light modulated by the DMD chip 3 has a certain degree of divergence angle, that is, the light output of the DMD chip 3 will be emitted in a conical shape, in order to avoid the reflective element of the guide member 13 and the reflective element of the guide member 22 from blocking the light output of the DMD chip 3, as shown in FIG. Fig.15 As shown, a light-through notch 131 is provided on the side of the reflective element close to the light path. The light-through notch 131 can be arc-shaped or square-shaped. The existence of the light-through notch 131 enables a light-through area with a diameter of 10 to 30 mm to be formed between the reflective element of the guide member 13 and the reflective element of the guide member 22, effectively avoiding obstruction, ensuring good light transmission, and ensuring light brightness. The curvature radius of the reflective element of the free-form surface of the guide member 13 is in the range of 600 to 800 mm, and the curvature radius of the reflective element of the free-form surface of the guide member 22 is in the range of 50 to 200 mm. The reflective element of the free-form surface needs to play the role of convergence and reflection guidance at the same time, so that the first light and the second light can be fully converged and guided to the DMD chip 3, thereby improving the utilization efficiency of light and the uniformity of light irradiation on the DMD chip 3.

[0084] In addition, the guide member 13 may also be Fig.12 The guiding member 22 shown in the figure has the same structure, that is, the guiding member 13 is composed of a converging lens 221 and a planar reflector 222 arranged on the optical path. The structure is simple and easy to implement. The converging lens 221 plays a converging role, while the planar reflector 222 plays a reflecting and guiding role. The functions of converging and reflecting and guiding are separated and completed by different components, which is convenient to implement and low in cost.

[0085] like Fig.13 As shown, when the guide member 13 is a reflective element with a free-form surface, the optical parameters of each component in the first light source assembly 1 are as shown in Tables 2 to 4.

[0086] Table 2

[0087]

[0088] Table 3

[0089]

[0090] Table 4

[0091]

[0092]

[0093] The guide member 13 is a polynomial free-form surface, and the lens unit 111 is an aspherical lens. The polynomial free-form surface formula is:

[0094]

[0095] In the formula, parameter c is the curvature corresponding to the radius, r is the radial height, and k is the conic coefficient ConicConstant.

[0096] Coefficient A i E i At X1Y0: 0

[0097] Coefficient A i E i At X0Y1: 1.0782755

[0098] Coefficient A i E i At X2Y0: -0.0096288399

[0099] Coefficient A i E i At X1Y1: 0

[0100] Coefficient A i E i At X0Y2: -0.017177593

[0101] Coefficient A i E i At X3Y0: 0

[0102] Coefficient A i E i At X2Y1: 0.00016562962

[0103] Coefficient A i E i At X1Y2: 0

[0104] Coefficient A i E i At X0Y3: 0.0022568171

[0105] Coefficient A i E i At X4Y0: -7.3668328e-05

[0106] Coefficient A i E i At X3Y1: 0

[0107] Coefficient A i E i At X2Y2: -0.00023847554

[0108] Coefficient A i E i At X1Y3: 0

[0109] Coefficient A i E i At X0Y4: -0.00038386525

[0110] Coefficient A i E i At X5Y0: 0

[0111] Coefficient A i E i At X4Y1: 1.9644518e-06

[0112] Coefficient A i E i At X3Y2: 0

[0113] Coefficient A i E i At X2Y3: -4.9990793e-06

[0114] Coefficient A i E i At X1Y4: 0

[0115] Coefficient A i E i At X0Y5: -2.9817832e-05

[0116] Coefficient A i E i At X6Y0: 4.6113798e-07

[0117] Coefficient A i E i At X5Y1: 0

[0118] Coefficient A i E iAt X4Y2: 2.5938843e-06

[0119] Coefficient A i E i At X3Y3: 0

[0120] Coefficient A i E i At X2Y4: 4.7117488e-06

[0121] Coefficient A i E i At X1Y5: 0

[0122] Coefficient A i E i At X0Y6: 5.8254208e-06

[0123] The aspheric formula is:

[0124]

[0125] In the formula, parameter c is the curvature corresponding to the radius, r is the radial height of the lens, k is the conic coefficient ConicConstant, α1 to α8 are the aspheric coefficients corresponding to the 2nd to 16th order, and the parameters of the lens unit 111 corresponding to the green light unit 11 are:

[0126] Coefficient of r^2 α1: 0

[0127] Coefficient α2 of r^4: -0.00047722037

[0128] Coefficient α3 of r^6: 9.5223031e-06

[0129] The coefficient of r^8 is α4:0

[0130] The coefficient of r^10 is α5:0

[0131] The coefficient of r^12 is α6:0

[0132] The coefficient of r^14 is α7:0

[0133] The coefficient of r^16 is α8:0

[0134] The parameters of the lens unit 111 corresponding to the red light color unit 11 are:

[0135] Coefficient of r^2 α1: 0

[0136] Coefficient α2 of r^4: -0.01545758683

[0137] Coefficient α3 of r^6: 9.3563489e-06

[0138] Coefficient α4 of r^8: 5.36895634211

[0139] The coefficient of r^10 is α5:0

[0140] The coefficient of r^12 is α6:0

[0141] The coefficient of r^14 is α7:0

[0142] The coefficient of r^16 is α8:0

[0143] The parameters of the lens unit 111 corresponding to the blue light unit 11 are:

[0144] Coefficient of r^2 α1: 0

[0145] Coefficient α2 of r^4: 0.00084003427

[0146] Coefficient α3 of r^6: -1.1094535e-05

[0147] Coefficient α4 of r^8: 2.4993142e-08

[0148] The coefficient of r^10 is α5:0

[0149] The coefficient of r^12 is α6:0

[0150] The coefficient of r^14 is α7:0

[0151] The coefficient of r^16 is α8:0

[0152] like Figure 1 As shown, the lens 4 mainly includes a front group, an aperture and a rear group coaxially arranged from the magnification side to the reduction side. The front group includes a first lens 41 with positive refractive power, a second lens 42 with negative refractive power and a third lens 43 with positive refractive power arranged from the magnification side to the reduction side, and the rear group includes a fourth lens 44 with positive refractive power and a fifth lens 45 with negative refractive power arranged from the magnification side to the reduction side.

[0153] More specifically, the first lens 41 to the fifth lens 45 are all spherical lenses, the first lens 41 is a biconvex lens, and is made of resin material, with low manufacturing cost, and its magnification side surface and reduction side surface are both spherical, and by reasonably optimizing the spherical coefficient, the system distortion and off-axis aberration can be effectively corrected, the second lens 42 is a biconcave lens, the third lens 43 is a plano-convex lens, the fourth lens 44 is a biconvex lens, and the fifth lens 45 is a meniscus lens convex to the magnification side. A micro-vibration mirror structure can also be set between the DMD chip 3 and the lens 4, so that the light reflected by the DMD chip 3 passes through the micro-vibration mirror structure and then output to the lens 4 to be projected outward.

[0154] The optical parameters of each component in the lens 4 are specifically shown in Table 5.

[0155] Table 5

[0156]

[0157] The above-mentioned lens 4 satisfies 35mm≤EFL≤55mm, FOV≥10°, 0.9≤FNO≤1.4, TA≤7°, where EFL is the effective focal length, FOV is the full field angle, FNO is the aperture number, and TA is the telecentric angle. The lens has good MTF performance at a spatial frequency of 93lp / mm and in the visible light range of 450nm to 655nm, small distortion, simple structure, and realizes low chromatic aberration, low distortion, large aperture, low cost, and high imaging quality.

[0158] In one embodiment, the headlight projection system further includes a control system, the control system receives instructions to control the first light source assembly, the second light source assembly and the DMD chip to perform corresponding work, the instructions are generated based on one or more of driving operation, voice, human-computer interaction interface operation, navigation system information, real-time road information, external ambient light, gesture, speed sensor, and gyroscope. The headlight projection system can interact with the user efficiently and fully, and the headlight projection system can provide additional functions while providing normal driving lighting, such as turning lighting, shielding light (light only illuminates the road surface and avoids illuminating oncoming vehicles, in this state, only a part of the micromirror units in the DMD chip are in the second state to guide the second light to the lens), display auxiliary information or pictures, etc., which can clearly convey the driving intention to the driver and other road participants, improve driving experience and safety, and adaptively adjust the output brightness and color mode, so as not to affect the projection perception under various ambient lights.

[0159] The aforementioned vehicle light projection system has multiple working modes, which can be switched manually or automatically according to the driving conditions or the control system. The working modes of the vehicle light projection system mainly include driving mode and parking mode.

[0160] In the driving mode, the second light source assembly is in working state and is guided by the DMD chip to the lens to emit light for driving lighting. One of the main functions of the second light source assembly is for driving lighting. On this basis, the second light source assembly and the first light source assembly can also be used for projecting images. Specifically, the driving mode includes at least one of the following driving mode states:

[0161] The first driving mode state is that the second light source assembly 2 is in the working state, the first light source assembly 1 is in the stopping state, and all the micromirror units in the DMD chip 3 are in the second state, so that the second light emitted by the second light source assembly 2 is emitted from the lens 4 for driving lighting;

[0162] The second driving mode state is that the second light source assembly 2 is in a working state, the first light source assembly 1 is in a stopped state, and some micromirror units in the DMD chip 3 are in a second state, so that the second light emitted by the second light source assembly 2 is emitted from the lens 4 for driving lighting and / or image projection;

[0163] The third driving mode state is that the second light source assembly 2 is in a working state, some of the color light units in the first light source assembly 1 are in a working state, some of the micromirror units in the DMD chip 3 are in a second state, and some of the micromirror units are in a first state, so that the second light emitted by the second light source assembly 2 is emitted from the lens 4 for driving lighting and / or image projection, and at the same time, the color light emitted by the color light unit in the first light source assembly 1 is emitted from the lens 4 to project an image.

[0164] The driving mode refers to the lighting working mode during the driving process of the vehicle, including the vehicle forward, backward, pause and other states. During the driving process of the vehicle, the headlight projection system is required to provide the driving lighting function. In addition, the headlight projection system can also provide additional auxiliary functions. Among them, the second light emitted by the second light source assembly 2 is direct white light, and the second light is projected through the lens 4 to meet the needs of the vehicle headlight driving lighting and ensure the safety and reliability of the driving lighting. In the first driving mode state, the second light source assembly 2 is in a working state and the first light source assembly 1 is in a stopped state. The micromirror unit in the DMD chip 3 is in a second state to reflect and guide the second light to the lens 4 for emission. When all the micromirror units in the DMD chip 3 are in the second state, the DMD chip 3 reflects and guides the second light to the lens 4 for emission to the maximum extent. At this time, the light projected by the headlight projection system is of maximum brightness and maximum illumination range. For example, the vehicle needs to turn on the high beam mode. In the second driving mode, when only part of the micromirror units in the DMD chip 3 are in the second state and part of the micromirror units are in the first state, only a part of the second light is reflected by the DMD chip 3 and guided to the lens 4 for emission. Relative to the maximum illumination range, the light emitted from the lens 4 only covers a local area, thereby realizing functions such as low beam lighting, turning lighting, shielding and letting light, information or image display or guidance. In the third driving mode, the second light source assembly 2 is in working state, and some color light units in the first light source assembly 1 are in working state, so that when some micromirror units in the DMD chip 3 are in the second state and some micromirror units are in the first state, the second light is reflected by the micromirror units in the second state and guided to the lens 4 for emission, while the color light emitted by the color light units in the first light source assembly 1 is reflected by the micromirror units in the first state and guided to the lens 4 for emission, thereby achieving driving lighting or image projection using the second light while also achieving information or image display and guidance functions using the color light emitted by the color light units in the first light source assembly 1, such as steering or lane guidance, speeding reminders, safety warnings, etc. For example, while using the second light for white light illumination, the red light emitted by the red light color light unit in the first light source assembly 1 is also used to project a red arrow for indication.

[0165] In the parking mode, the second light source assembly is in working state and / or the first light source assembly is in working state and is guided by the DMD chip to the lens to project an image. Specifically, the parking mode includes at least one of the following parking mode states:

[0166] The first parking mode state is that the second light source assembly 2 is in a working state, the first light source assembly 1 is in a stopped state, and the second light emitted by the second light source assembly 2 is emitted from the lens 4 through the DMD chip 3 to project a black and white image;

[0167] The second parking mode state is that the second light source assembly 2 is in a stopped state, the first light source assembly 1 is in a working state, and the first light emitted by the first light source assembly 1 is emitted from the lens 4 through the DMD chip 3 to project a color image;

[0168] The third parking mode state is that the second light source assembly is in a working state, the first light source assembly is in a working state, the second light emitted by the second light source assembly and the first light emitted by the first light source assembly are emitted from the lens through the DMD chip to project an image.

[0169] The parking mode refers to the working mode when the car is parked. It mainly provides entertainment projection function, and can project black and white pictures or color pictures according to needs, flexibly meet different needs, rich functions, and good use experience. The first parking mode state is black and white picture projection, and the projected picture is only a black and white picture of bright and dark areas. Specifically, part of the micromirror units in the DMD chip 3 are in the second state to reflect and guide the second light irradiated on the micromirror unit to the lens 4 to form a bright area, while the other part of the micromirror units in the DMD chip 3 are in the first state, and the second light irradiated on the micromirror unit can no longer be emitted from the lens 4, so as to form a dark area, that is, to achieve black and white projection. The second parking mode state is color picture projection, and each color light unit in the first light source assembly 1 cooperates with the DMD chip 3. When the micromirror unit in the DMD chip 3 switches to the first state, the corresponding color light to be emitted is reflected and guided to the lens 4 to be emitted, and finally the color picture is projected. In the third parking mode state, the first light source assembly 1 cooperates with the second light source assembly 2, and the second light source assembly 2 can increase the brightness of the white light area in the picture.

[0170] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A projection system, characterized in that: The device comprises a first light source assembly, a second light source assembly, a DMD chip and a lens, wherein the first light emitted by the first light source assembly is emitted to the DMD chip along a first direction, and when the micromirror unit in the DMD chip is in a first state, the first light is guided to a light-exiting optical path so as to be emitted from the lens, and the second light emitted by the second light source assembly is emitted to the DMD chip along a second direction, and when the micromirror unit in the DMD chip is in a second state, the second light is guided to a light-exiting optical path so as to be emitted from the lens; At least one of the first light source assembly and the second light source assembly comprises a plurality of light source sub-units arranged side by side, and a light homogenizing element is arranged on an outgoing light path of the light source sub-units.

2. The projection system according to claim 1, characterized in that: A collimating device is arranged on the outgoing light path of the light source subunit, and the light homogenizing element is arranged between the light source subunit and the collimating device and / or on the outgoing light path of the collimating device.

3. The projection system according to claim 2, characterized in that: The collimating device is an aspherical lens.

4. The projection system according to claim 1, characterized in that: The light homogenizing element includes a light homogenizing sheet with a microstructure on one side, a light homogenizing sheet with a microstructure on both sides, or a combination of two light homogenizing sheets with a microstructure on one side.

5. The projection system according to claim 4, characterized in that: The light source sub-units are arranged along a straight line, and the microstructure includes micro-prisms whose length direction is perpendicular to the arrangement direction of the light source sub-units. A plurality of micro-prisms are arranged along the arrangement direction of the light source sub-units.

6. The projection system according to claim 1, characterized in that: The first light source assembly includes a plurality of color light units of different colors to obtain a first light through a light combining assembly, and the second light source assembly includes a second light source that directly emits a second light, the second light is white light, and at least one of the color light unit and the second light source includes a plurality of light source sub-units arranged side by side.

7. The projection system according to claim 1, characterized in that: The light source subunit is an LED unit or a laser unit.

8. The projection system according to claim 1, characterized in that: The first light emitted by the first light source assembly is guided by the first guide member to be emitted to the DMD chip along a first direction, and the second light emitted by the second light source assembly is guided by the second guide member to be emitted to the DMD chip along a second direction; The first guiding member and / or the second guiding member is a reflective element with a free-form surface; Alternatively, the first guiding member and / or the second guiding member comprises a converging lens and a planar reflector arranged on the optical path.

9. The projection system according to claim 8, characterized in that: The guiding member 1 and the guiding member 2 are respectively located on both sides of the light output path to guide the light obliquely to the DMD chip respectively. The reflecting element is provided with a light-through notch on one side of the light output path, and the diameter of the light-through notch is 10 to 30 mm.

10. The projection system according to claim 1, characterized in that: The first direction is an angle range of 22 to 38 degrees for the first light incident on the DMD chip, and the second direction is an angle range of -38 to -22 degrees for the second light incident on the DMD chip.

Images