Illumination module, image generation device, display system, and mobile device

Abstract

The invention provides a lighting module, an image generation device, a display system and a mobile device. Comprising a light source, a collimation element, a dodging element and a diffusion element which are arranged in sequence, the light source comprises a first light-emitting unit, the collimating element comprises a first total internal reflection lens, the first light-emitting unit and the first total internal reflection lens are correspondingly arranged, the first total internal reflection lens is provided with a first central axis, and the first central axis is obliquely arranged relative to the optical axis of the dodging element; the first total internal reflection lens is configured to collimate light emitted by the first light emitting unit; the light uniformizing element is configured to uniformize the light rays collimated by the collimating element; and the diffusion element is configured to diffuse the light which is dodging by the dodging element. The first total internal reflection lens is obliquely arranged, so that the propagation angle of the collimated light can be changed, and the illumination intensity in a large-angle visible range is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical technology, and specifically to a lighting module, an image generating device, a display system, and a movable device. Background Art

[0002] The backlighting system in the head-up display is used to illuminate the image information including instruments and navigation, so that this part of information can be projected near the driver's line of sight through the imaging light path, avoiding frequent lowering of the head to look at the dashboard while driving. The virtual image projected onto the car's windshield must have uniform brightness perceived by the human eye to avoid glare and ensure driving safety.

[0003] However, in current head-up displays, there is a problem of insufficient light intensity within a wide-angle viewing range. Summary of the invention

[0004] The embodiments of the present application provide a lighting module, an image generating device, a display system and a movable device, which can improve the illumination intensity of the large-angle output light of the lighting module, thereby improving the light intensity within a large-angle visible range.

[0005] In a first aspect, an embodiment of the present application provides a lighting module, comprising a light source, a collimating element, a homogenizing element and a diffusing element arranged in sequence; the light source comprises a first light-emitting unit, the collimating element comprises a first total internal reflection lens, the first light-emitting unit is arranged corresponding to the first total internal reflection lens, the first total internal reflection lens has a first central axis, and the first central axis is inclined relative to the optical axis of the homogenizing element; the first total internal reflection lens is configured to collimate the light emitted by the first light-emitting unit; the homogenizing element is configured to homogenize the light after being collimated by the collimating element; the diffusing element is configured to diffuse the light after being homogenized by the homogenizing element.

[0006] In one or more embodiments, on a projection plane perpendicular to a first direction of the light homogenizing element, the first central axis is tilted clockwise or counterclockwise at a first angle relative to the optical axis of the light homogenizing element; and / or, on a projection plane perpendicular to a second direction of the light homogenizing element, the first central axis is tilted clockwise or counterclockwise at a second angle relative to the optical axis of the light homogenizing element.

[0007] In one or more embodiments, the first angle is greater than 0° and the first angle is less than or equal to a first preset angle; and / or the second angle is greater than 0° and the second angle is less than or equal to a second preset angle.

[0008] In one or more embodiments, the number of the first light-emitting units is multiple, the number of the first total internal reflection lenses is multiple, and one first light-emitting unit is corresponding to one first total internal reflection lens; in the first direction of the light homogenizing element, at least two of the first total internal reflection lenses are symmetrical about a first preset center plane, and the first preset center plane is perpendicular to the first direction; and / or; in the second direction of the light homogenizing element, at least two of the first total internal reflection lenses are symmetrical about a second preset center plane, and the second preset center plane is perpendicular to the second direction.

[0009] In one or more embodiments, the light source also includes a second light-emitting unit, and the collimating element also includes a second total internal reflection lens; the second light-emitting unit is arranged corresponding to the second total internal reflection lens, and the second total internal reflection lens has a second central axis, and the second central axis is arranged parallel to the optical axis of the light homogenizing element.

[0010] In one or more embodiments, the light homogenizing element has a first surface close to the light source and a second surface away from the light source; a microlens array is provided on the second surface.

[0011] In one or more embodiments, the second surface is a plane or a curved surface.

[0012] In one or more embodiments, the collimating element is disposed in close contact with the first surface.

[0013] In a second aspect, an embodiment of the present application further provides an image generating device, the image generating device comprising: a display panel and a lighting module as described in any of the above embodiments. The lighting module is disposed on the light incident side of the display panel.

[0014] In a third aspect, an embodiment of the present application further provides a display system, the display system comprising an emission device and an image generating device as described in the second aspect. The image generating device is disposed on the light incident side of the emission device.

[0015] In a fourth aspect, an embodiment of the present application further provides a mobile device, the mobile device comprising:

[0016] The image generating device as described in the second aspect is configured to output the image to the first target area, and / or includes the display system as described in the third aspect; the display system is configured to output the image to the second target area.

[0017] The beneficial effects of the embodiments of the present application are as follows: the present application provides a lighting module, an image generating device, a display system and a movable device. It includes a light source, a collimating element, a homogenizing element and a diffusion element which are arranged in sequence; the light source includes a first light-emitting unit, the collimating element includes a first total internal reflection lens, the first light-emitting unit is arranged corresponding to the first total internal reflection lens, the first total internal reflection lens has a first central axis, and the first central axis is arranged obliquely relative to the optical axis of the homogenizing element; the first total internal reflection lens is configured to collimate the light emitted by the first light-emitting unit; the homogenizing element is configured to homogenize the light after collimation by the collimating element; the diffusion element is configured to diffuse the light after homogenization by the homogenizing element. By tilting the first total internal reflection lens, the propagation angle of the collimated light can be changed, which can not only improve the uniformity of illumination, but also improve the illumination intensity of the large-angle emergent light of the lighting module, and can be subsequently applied to the image generating device or the display system to improve the illumination intensity of the large-angle visible range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A structural block diagram of a lighting module provided in an embodiment of the present application;

[0020] Figure 2 A structural diagram of a lighting module provided in an embodiment of the present application;

[0021] Figure 3 A partial structural diagram of a lighting module provided in an embodiment of the present application;

[0022] Figure 4 A partial structural diagram of another lighting module provided in an embodiment of the present application;

[0023] Figure 5 A partial structural diagram of another lighting module provided in an embodiment of the present application;

[0024] Figure 6 A structural diagram of another lighting module provided in an embodiment of the present application;

[0025] Figure 7 A partial structural diagram of another lighting module provided in an embodiment of the present application;

[0026] Figure 8 A structural diagram of another lighting module provided in an embodiment of the present application;

[0027] Fig. 9A structural diagram of a light homogenizing element provided in an embodiment of the present application;

[0028] Fig.10 Another structural diagram of the light homogenizing element provided in the embodiment of the present application;

[0029] Fig.11 A structural diagram of another lighting module provided in an embodiment of the present application;

[0030] Fig.12 A structural block diagram of an image generating device provided in an embodiment of the present application;

[0031] Fig.13 A structural block diagram of a display system provided in an embodiment of the present application;

[0032] Fig.14 This is a structural diagram of the fifth lighting module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "electrically connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. In addition, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0035] In the related technology, lighting modules mostly use total reflection lenses, compound eye lenses, plane reflectors and multiple shaping lenses to even the light and control the angle, size and direction of the light beam. Although this method can achieve a certain degree of even light effect, due to the large number of optical components used, the entire system is large in size and high in cost, and the light absorption loss of each lens is large, resulting in low utilization of light energy.

[0036] In order to solve the above-mentioned technical problems, the present application provides a lighting module, an image generating device, a display system and a movable device. By tilting the first total internal reflection lens, the direction of the collimated light is changed. When multiple total internal reflection lens arrays are subsequently arranged for collimation, the method provided by the present application can make the light fill the light intensity of the corresponding area of ​​the gap between the multiple total internal reflection lens arrays, thereby improving the uniform light effect, and can increase the light intensity of the large-angle output light of the lighting module. When subsequently applied to an image generating device or a display system, it can increase the light intensity in a large-angle visible range.

[0037] In a first aspect, an embodiment of the present application provides a lighting module, referring to Figure 1 The lighting module 100 includes a light source 10, a collimating element 20, a light homogenizing element 30 and a diffusion element 40 which are arranged in sequence.

[0038] The light source 10 includes a first light-emitting unit 11, and the collimating element 20 includes a first total internal reflection lens 21. The first light-emitting unit 11 is correspondingly arranged with the first total internal reflection lens 21. The first total internal reflection lens 21 has a first central axis O2, and the first central axis O2 is inclined relative to the optical axis O1 of the light homogenizing element 30.

[0039] The first total internal reflection lens 21 is configured to collimate the light emitted by the first light emitting unit 11. The light homogenizing element 30 is configured to homogenize the light collimated by the collimating element 20. The diffusion element 40 is configured to diffuse the light homogenized by the light homogenizing element 30.

[0040] The first light-emitting unit 11 includes a light-emitting diode (LED) lamp bead, an electroluminescent device, a cold cathode fluorescent lamp, a laser diode or other elements capable of emitting light, which can be used to provide light for illumination.

[0041] The first total internal reflection lens 21 can use the total reflection principle of light to adjust the direction of the light emitted by the first light-emitting unit 11, so that the light propagates in the form of parallel light or approximately parallel light, thereby realizing the collimation of the light. The first central axis O2 of the first total internal reflection lens 21 is the optical axis of the first total internal reflection lens 21, and the optical axis is a virtual straight line. When the light beam passes through the first total internal reflection lens 21 along the first central axis O2 of the first total internal reflection lens 21, the light will not produce any changes in optical properties. The first total internal reflection lens 21 can collect and refract light, improve the light efficiency utilization rate of the light source 10, reduce the light loss of the light, and improve the uniformity, so as to realize the fill light of the low beam and the enhancement of the high beam. In addition, the first total internal reflection lens 21 is small in size, which reduces the volume of the lighting module 100, and the lighting module 100 can be applied to miniaturized design later.

[0042] The light homogenizing element 30 further processes the collimated light to make the light distribution on the output surface more uniform, which can ensure the consistency of light intensity in the illumination area and reduce the uneven brightness. The light homogenizing element 30 can use devices such as microlens arrays and light pipes. The optical axis O1 of the light homogenizing element 30 is a virtual straight line. When the light beam passes through the light homogenizing element 30 along the optical axis O1 of the light homogenizing element 30, the light will not produce any changes in optical properties. The optical axis O1 is usually parallel to the optical axis of the light source 10.

[0043] The diffusion element 40 further diffuses the light after the light homogenization process, so that the light distribution range on the output surface of the lighting module 100 is larger. The illumination light diffused by the diffusion element 40 can be directly used to illuminate the display panel, and the illumination light is transmitted to the display panel at a predetermined angle. The diffusion element 40 can use a diffusion film or other devices. The diffusion element 40 is tilted or vertically arranged relative to the optical axis O1 of the homogenization element 30 to adapt to the display panel that is tilted or vertically arranged relative to the optical axis O1 of the homogenization element 30.

[0044] When a plurality of first total internal reflection lenses (21a, 21b, ..., 21p) are arranged in an array for collimation, as shown in FIG. Figure 3As shown, in the first direction x of the homogenizing element 30, there are arrangement gaps between several adjacent first total internal reflection lenses, such as the arrangement gap 210 between the first total internal reflection lens 21a, the first total internal reflection lens 21b, the first total internal reflection lens 21i and the first total internal reflection lens 21j. If at least one of the first total internal reflection lenses is not tilted, the illumination intensity of the area corresponding to the subsequent arrangement gap 210 will be significantly weaker than the illumination intensity of the area where the first total internal reflection lens exits. In the present application, by tilting the first total internal reflection lens 21, the direction of the collimated light is changed, so that the light spot emitted by the first total internal reflection lens 21 can overlap with the area corresponding to at least one arrangement gap 210, effectively enhancing the illumination intensity of the area corresponding to the arrangement gap 210, so as to improve the uniform illumination of the light exiting surface of the lighting module 100 and improve the homogenizing effect. Moreover, in the present application, there is no need to use a shaping lens to adjust the direction of the light, reduce the number of optical elements, and thus reduce the volume and weight of the system. This is conducive to the miniaturization and lightweight design of the lighting module 100, and reduces energy loss and improves the utilization rate of light energy, which can reduce the energy consumption of the system and improve the brightness and contrast of the display system. In addition, the lighting module 100 provided by the present application does not need to use expensive new optical elements, and can directly use the total internal reflection lens structure in the prior art, which can reduce costs and is conducive to large-scale applications.

[0045] Moreover, the illumination intensity of the large-angle emitted light of the lighting module can be improved, that is, the illumination intensity of the light with a large emission angle can be improved, so that when the human eye is in a large-angle visible range (large field of view angle range), such as when the human eye is in a marginal field of view angle range, a picture with sufficient illumination intensity can still be observed, and the subsequent application in an image generation device or display system can improve the illumination intensity of the large-angle visible range. Among them, the emission angle is the angle between the light emitted from the light source 10 to the diffusion element 40 and the optical axis of the uniform light element O1.

[0046] In some embodiments, on a projection plane perpendicular to the first direction x of the light homogenizing element 30 , the first central axis O2 is tilted clockwise or counterclockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30 .

[0047] The first direction x may be the direction in which the long side of the emission plane of the light homogenizing element 30 points. Figure 4 In the illustrated embodiment, the first central axis O2 is tilted clockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30 .

[0048] By deflecting the first central axis O2 and the optical axis O1 of the light homogenizing element 30 in the first direction x, the propagation path of the collimated light can be adjusted, thereby effectively controlling the distribution of the light and improving the homogenizing effect.

[0049] In some embodiments, on a projection plane perpendicular to the second direction y of the light homogenizing element 30 , the first central axis O2 is tilted clockwise or counterclockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30 .

[0050] The second direction y may be the direction of the short side of the exit plane of the light homogenizing element 30. Figure 5 In the illustrated embodiment, the first central axis O2 is tilted clockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30 .

[0051] By deflecting the first central axis O2 and the optical axis O1 of the light homogenizing element 30 in the second direction y, the propagation path of the collimated light can be adjusted, thereby effectively controlling the distribution of the light and improving the homogenizing effect.

[0052] In some embodiments, the first angle is greater than 0° and is less than or equal to a first preset angle; and / or, the second angle is greater than 0° and is less than or equal to a second preset angle.

[0053] Specifically, the first preset angle and the second preset angle are determined based on the maximum angle at which the light can just illuminate the edge of the display panel after passing through the collimating element 20 in the image generating device to be applied, so as to ensure that the light can evenly and fully cover the entire display panel. In some implementations, the first preset angle and the second preset angle may both be less than 10°, for example, the first preset angle and the second preset angle may be 3°, 5°, 6°, 7°, 9°, etc., or may be 3.5°, 5.5°, 6.5°, etc.

[0054] By limiting the range of the first angle and the second angle, it can be ensured that the light emitted by the lighting module 100 can be irradiated onto the display panel at an optimal angle and distribution, thereby providing a clear, uniform and high-quality display effect. At the same time, it can prevent the light from being excessively tilted or deviated, reduce light loss, and further improve the overall optical performance.

[0055] In some embodiments, the number of first light-emitting units 11 is multiple, the number of first total internal reflection lenses 21 is multiple, and one first light-emitting unit 11 is corresponding to one first total internal reflection lens 21; in the first direction x of the light homogenizing element 30, at least two first total internal reflection lenses 21 are symmetrical about the first preset center plane S1, and the first preset center plane S1 is perpendicular to the first direction x.

[0056] Specifically, the inclination directions of the two first total internal reflection lenses 21 symmetrical about the first preset center plane S1 are opposite, the first angles of the two first total internal reflection lenses 21 symmetrical about the first preset center plane S1 with opposite inclination directions are equal, and / or the second angles of the two first total internal reflection lenses 21 symmetrical about the first preset center plane S1 are equal.

[0057] The first preset central plane S1 refers to a plane passing through the center of the light homogenizing element 30 and perpendicular to the first direction x.

[0058] For details, see Figure 3 The number of the first light-emitting units and the first total internal reflection lenses is 16, and the first light-emitting units and the first total internal reflection lenses are arranged in 2 rows and 8 columns, wherein Figure 3 In the figure, the first direction x is a horizontal rightward direction. For example, the first total internal reflection lens 21a in the first row and the eighth total internal reflection lens 21h in the first row are symmetrical about the first preset center plane S1.

[0059] That is, if the first total internal reflection lens 21a is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, and the first central axis O2 of the first total internal reflection lens 21a is set to be tilted clockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, then the first total internal reflection lens 21h is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, and the first central axis O2 of the first total internal reflection lens 21h is set to be tilted counterclockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30.

[0060] If on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21a is tilted counterclockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30, then on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21h is tilted clockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30.

[0061] If the first total internal reflection lens 21a is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21a is set to be tilted clockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, and on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21a is set to be tilted counterclockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30, then the first total internal reflection lens 21h is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21h is set to be tilted counterclockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, and on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21h is set to be tilted clockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30.

[0062] The first total internal reflection lenses 21b and 21g, 21j and 21o, 21c and 21f, 21d and 21e, 21i and 21p, 21j and 21o, 21k and 21n, 21l and 21m are all symmetrical about the first preset center plane S1, and the symmetrical relationship is the same as the first total internal reflection lenses 21a and 21h mentioned above, which will not be repeated here.

[0063] Further, whether the two corresponding first total internal reflection lenses (such as the first total internal reflection lenses 21b and 21g) in the first direction x are symmetrical about the first preset center plane S1 needs to be determined according to the actual optical path design. For example, when the diffusion element 40 is not tilted in the first direction x, that is, when the incident plane (or the exit plane) of the diffusion element 40 is parallel to the first direction x, the corresponding two first total internal reflection lenses (such as the first total internal reflection lenses 21b and 21g) are symmetrical about the first preset center plane S1. For example, when the diffusion element 40 is tilted in the first direction x, that is, when the incident plane (or the exit plane) of the diffusion element 40 is not parallel to the first direction x, the corresponding two first total internal reflection lenses (such as the first total internal reflection lenses 21b and 21g) may not be symmetrical about the first preset center plane S1.

[0064] Through the above configuration, the light can be effectively balanced and dispersed, so that the light received by the light homogenizing element 30 is more uniform, which helps to reduce problems such as light spots and uneven brightness, and improve the light uniformity of the entire lighting module.

[0065] In the above embodiment, the number of the first light emitting units and the first total internal reflection lenses is not limited, and the number and arrangement can be adjusted according to actual needs.

[0066] In some embodiments, in the second direction y of the light homogenizing element 30 , at least two first total internal reflection lenses 21 are symmetrical about a second preset center plane S2 , and the second preset center plane S2 is perpendicular to the second direction y.

[0067] Specifically, the inclination directions of the two first total internal reflection lenses 21 symmetrical about the second preset center plane S2 are opposite, the first angles of the two first total internal reflection lenses 21 symmetrical about the second preset center plane S2 are equal, and / or the second angles of the two first total internal reflection lenses 21 symmetrical about the second preset center plane S2 are equal, and the inclination directions of the two first total internal reflection lenses 21 are opposite.

[0068] The second preset central plane S2 refers to a plane passing through the center of the light homogenizing element 30 and perpendicular to the second direction y.

[0069] For details, see Figure 6 , the number of the first light emitting unit and the first total internal reflection lens is 3, wherein Figure 6 In the embodiment, the second direction y is a vertical downward direction. For example, the first total internal reflection lens 21q and the first total internal reflection lens 21s are symmetrical about the second preset center plane S2, and the first angles and / or second angles of the two first total internal reflection lenses are equal.

[0070] That is, if the first total internal reflection lens 21q is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, and the first central axis O2 of the first total internal reflection lens 21q is tilted clockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, then the first total internal reflection lens 21s is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, and the first central axis O2 of the first total internal reflection lens 21s is tilted counterclockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30.

[0071] If the first total internal reflection lens 21q is on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21q is tilted counterclockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30, then on the projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21s is tilted clockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30.

[0072] If the first total internal reflection lens 21q is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21q is tilted clockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, and on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21q is tilted counterclockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30, then the first total internal reflection lens 21s is on a projection plane perpendicular to the first direction x of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21s is tilted counterclockwise at a first angle θ1 relative to the optical axis O1 of the light homogenizing element 30, and on a projection plane perpendicular to the second direction y of the light homogenizing element 30, the first central axis O2 of the first total internal reflection lens 21s is tilted clockwise at a second angle θ2 relative to the optical axis O1 of the light homogenizing element 30.

[0073] Further, whether the two first total internal reflection lenses 21q and 21s corresponding to the second direction y are symmetrical about the second preset center plane S2 needs to be determined according to the actual optical path design. For example, when the diffusion element 40 is not tilted in the second direction y, that is, when the incident plane (or exit plane) of the diffusion element 40 is parallel to the second direction y, the two first total internal reflection lenses 21q and 21s are symmetrical about the first preset center plane S2. For example, when the diffusion element 40 is tilted in the second direction y, that is, when the incident plane (or exit plane) of the diffusion element 40 is not parallel to the second direction y, the two first total internal reflection lenses 21q and 21s may not be symmetrical about the first preset center plane S2.

[0074] Through the above configuration, the light can be effectively balanced and dispersed, so that the light received by the light homogenizing element 30 is more uniform, which helps to reduce problems such as light spots and uneven brightness, and improve the light uniformity of the entire lighting module.

[0075] In the above embodiment, the number of the first light emitting units and the first total internal reflection lenses is not limited, and the number and arrangement can be adjusted according to actual needs.

[0076] In some embodiments, the light source 10 further includes a second light emitting unit, see Figure 6 The collimating element 20 further includes a second total internal reflection lens 22a. The second light emitting unit is arranged corresponding to the second total internal reflection lens 22a. The second total internal reflection lens 22a has a second central axis, and the second central axis is arranged parallel to the optical axis O1 of the light homogenizing element 30.

[0077] Further, the second total internal reflection lens 22a is symmetrical about the second preset center plane S2.

[0078] In some of these embodiments, see Figure 7The light source 10 also includes a second light-emitting unit, and the collimating element 20 also includes a second total internal reflection lens (22b, 22c); the second light-emitting unit and the second total internal reflection lens (22b, 22c) are arranged correspondingly, and the second total internal reflection lens (22b, 22c) has a second central axis, and the second central axis is arranged parallel to the optical axis O1 of the uniform light element 30.

[0079] Further, the second total internal reflection lens 22b is symmetrical about the first preset center plane S1, and the second total internal reflection lens 22c is symmetrical about the first preset center plane S1.

[0080] The second light-emitting unit includes a light-emitting diode (LED) lamp bead, an electroluminescent device, a cold cathode fluorescent lamp, a laser diode or other elements capable of emitting light, which can be used to provide light for illumination.

[0081] In the above two embodiments, the second total internal reflection lens (22a, 22b, 22c) can use the total reflection principle of light to adjust the direction of the light emitted by the second light-emitting unit, so that the light is propagated in the form of parallel light or approximately parallel light, thereby achieving collimation of the light. The second central axis of the second total internal reflection lens (22a, 22b, 22c) is the perpendicular bisector of the exit plane of the second total internal reflection lens (22a, 22b, 22c). The second total internal reflection lens (22a, 22b, 22c) can collect and refract the light, improve the light efficiency utilization rate of the light source 10, reduce the light loss of the light, and improve the uniformity, so as to achieve the fill light of the low beam and the enhancement of the high beam. In addition, the second total internal reflection lens is small in size and can be applied to miniaturized design in the future.

[0082] The second central axis is arranged parallel to the optical axis O1 of the light homogenizing element 30, that is, the second total internal reflection lens (22a, 22b, 22c) is not deflected from the optical axis O1 of the light homogenizing element 30. By adding the second light-emitting unit and the second total internal reflection lens (22a, 22b, 22c), the lighting module 100 can adjust the brightness and distribution of the light source 10 as needed, thereby increasing the flexibility and expansibility of the lighting module 100 and improving the application scenarios of the lighting module 100.

[0083] In some embodiments, the light homogenizing element 30 has a first surface S3 close to the light source 10 and a second surface S4 far from the light source 10 ; a microlens array is disposed on the second surface S4 .

[0084] A microlens array is an optical element composed of a large number of tiny lenses arranged in a regular or irregular manner. The tiny lenses can be convex microlenses, and each microlens can collimate the light, so that the light passing through the microlens array can be propagated in a more uniform and parallel manner.

[0085] In this embodiment, a light homogenizing element 30 provided with a microlens array is selected for light homogenization. By adjusting the shape, size and arrangement of each microlens in the microlens array, the distribution of light can be accurately controlled, which helps to achieve specific lighting effects, such as uniform lighting, light spot shaping, etc.

[0086] In some of these embodiments, see Fig. 9 , the second surface S4 of the light homogenizing element 30 is a plane.

[0087] By adopting a planar design, the processing cost can be reduced, thereby lowering the cost of the lighting module 100 .

[0088] In some of these embodiments, see Fig.10 The second surface S4 of the light homogenizing element 30 is a curved surface.

[0089] The specific parameters of the curved surface can be optimized according to specific lighting requirements to achieve the best light deflection and uniform light effects.

[0090] By adopting a curved surface design, the distribution of light can be effectively controlled to achieve a more uniform lighting effect, eliminate bright spots and dark areas, and improve the display quality of the image generating device.

[0091] In some of these embodiments, see Figure 8 The collimating element 20 is disposed in contact with the first surface S3 of the light homogenizing element 30 .

[0092] The collimating element 20 and the first surface S3 of the light homogenizing element 30 may be bonded together by optical glue, thereby reducing the volume of the lighting module 100 .

[0093] In some of these embodiments, see Figure 2 The first surface S3 of the light homogenizing element 30 is a non-planar surface. For example, the first surface S3 of the light homogenizing element 30 is composed of at least two planes with different inclination angles.

[0094] In some of these embodiments, see Figure 6 and Figure 8 The first surface S3 of the light homogenizing element 30 is a plane. In this case, the fitting surface of the first total internal reflection lens 21 needs to be cut to fit the first surface S3 of the light homogenizing element 30 .

[0095] In a second aspect, the present application also provides an image generating device 1000, referring to Fig.12The image generating device 1000 comprises: a display panel 200, and an illumination module 100 as in any of the above embodiments. The illumination module 100 is disposed on the light incident side of the display panel 200. The diffusion element 40 is disposed in close contact with the display panel 200, that is, the display panel 200 can be disposed tilted or not tilted in the first direction x, and tilted or not tilted in the second direction y according to actual needs.

[0096] Further, see Figure 3 When the display panel 200 is not tilted in the first direction x, the two first total internal reflection lenses 21a and 21h, 21b and 21g, 21j and 21o, 21c and 21f, 21d and 21e, 21i and 21p, 21j and 21o, 21k and 21n, 21l and 21m can be symmetrically arranged about the first preset center plane S1.

[0097] Further, see Figure 3 When the display panel 200 is tilted in the first direction x, the two first total internal reflection lenses 21a and 21h, 21b and 21g, 21j and 21o, 21c and 21f, 21d and 21e, 21i and 21p, 21j and 21o, 21k and 21n, 21l and 21m may not be symmetrically arranged about the first preset center plane S1.

[0098] Further, see Figure 6 When the display panel 200 is not tilted in the second direction y, the two first total internal reflection lenses 21q and 21s may be symmetrically arranged about the second preset center plane S2. The first total internal reflection lens 21a itself may be symmetrical about the second preset center plane S2.

[0099] Further, see Fig.11 When the display panel 200 and the diffusion element 40 are arranged to be tilted in the second direction y, the first total internal reflection lenses 21q and 21s may not be symmetrical about the second preset center plane S2. The first total internal reflection lens 21a itself may also not be symmetrical about the second preset center plane S2.

[0100] In this embodiment, the lighting module 100 has the same structure and function as the lighting module 100 described in any embodiment of the first aspect, and will not be repeated here.

[0101] The display panel 200 is configured to receive the illumination light emitted by the illumination module 100 and generate a virtual image. The virtual image can be a color image or a black and white image. The color of the illumination light output by the illumination module 100 and / or the type of the display panel 200 can be set according to actual needs. For example, the display panel 200 can be a liquid crystal display (LCD).

[0102] In the image generating device 1000 , after the light output by the lighting module 100 is projected onto the display panel 200 , it is stimulated to generate an image light beam.

[0103] In a third aspect, the present application also provides a display system 10000, referring to Fig.13 The display system 10000 includes an emission device 2000, such as the image generating device 1000 of the second aspect. The image generating device 1000 is arranged on the light incident side of the emission device 2000.

[0104] In this embodiment, the image generating device 1000 has the same structure and function as the image generating device 1000 described in any embodiment of the second aspect, and will not be repeated here.

[0105] The display system 1000 may be a projector, a head-up display, a light field screen, a projection lamp, a wearable / head-mounted device, a virtual reality device, an augmented reality device, etc. The output device 2000 may include a projection lens, a reflector, etc. The display system is not specifically limited in the embodiments of the present application.

[0106] For example, the display system 1000 is an augmented reality head-up display (AR HUD), the output device includes a reflector mechanism, the reflector mechanism includes at least one reflector, the reflector can be a curved or flat reflector, the reflector can be set to be rotatable or non-rotatable, the image generating device projects the image light to the reflector mechanism, the reflector mechanism deflects the image light, and finally projects the image light to the target area for image display. The AR HUD may include the lighting module described in any embodiment of the present application, and has the same structure and function as the lighting module 100 described in any embodiment of the first aspect.

[0107] For further information, see Figure 2 or Figure 8 The lighting module 100 included in the AR HUD includes a first light-emitting unit 11, a first total internal reflection lens 21, a uniform light element 30 and a diffusion element 40. The specific configuration method can refer to the above content and will not be repeated here. In the lighting module 100, the light emitted by the first light-emitting unit 11 can be incident on the human eye after passing through the first total internal reflection lens 21, the uniform light element 30, the diffusion element 40, the display panel and the output device.

[0108] In this AR HUD, since the intensity of the light emitted by the first light-emitting unit 11 is the highest at the optical axis, and there is an angular deviation between the visible range of the human eye and the optical axis of the light emitted by the first light-emitting unit 11, the light emitted by the first light-emitting unit 11 has insufficient intensity within the visible range of the human eye. Insufficient intensity will cause insufficient brightness of the image seen by the user, thereby affecting the use effect. In this embodiment, by using the first total internal reflection lens 21 set obliquely in the lighting module 100, the light emitted by the first light-emitting unit 11 is deflected for the first time, so that the optical axis of the light emitted by the first light-emitting unit 11 is deflected to adapt to the visible range of the human eye, the propagation direction of the light emitted by the first light-emitting unit 11 changes, and the exit angle of the light emitted by the first total internal reflection lens 21 becomes larger, so that the illumination intensity of the large-angle exit light of the lighting module 100 can be improved, that is, the illumination intensity of the light with a larger exit angle is increased, and the illumination intensity of the large-angle visible range of the AR HUD can be improved. In this way, when using the AR HUD, when the human eye is in a large-angle visible range (large field of view angle range), such as when the human eye is in the edge field of view angle range, a picture of sufficient brightness can still be observed. In addition, by using the first total internal reflection lens 21 set obliquely, the direction of the collimated light is changed, and the illumination intensity of the area corresponding to the arrangement gap existing when the total internal reflection lens is arranged can be effectively enhanced, so as to improve the uniform illumination of the light-emitting surface of the AR HUD and improve the uniform light effect.

[0109] Furthermore, in some embodiments, the lighting module 100 used in the AR HUD adopts Fig.10 When the light homogenizing element 30 is shown, Fig.14 As shown, the first surface S3 of the light homogenizing element 30 is arranged close to the light source 10, and the second surface S4 (curved surface) of the light homogenizing element 30 is arranged away from the light source 10. By designing the curved surface parameters of the second surface S4 of the light homogenizing element 30, and the second surface S4 of the light homogenizing element 30 and the first surface S3 of the light homogenizing element 30 form a wedge-shaped surface, the light emitted through the first total internal reflection lens 21 can be subjected to a second optical axis deflection when passing through the light homogenizing element 20, thereby further increasing the emission angle of the light emitted through the lighting module 100, and further improving the illumination intensity of the large-angle emitted light of the lighting module 100, that is, further improving the illumination intensity of the light with a larger emission angle, and further improving the illumination intensity of the large-angle visible range.

[0110] In a fourth aspect, an embodiment of the present application further provides a movable device, comprising: an image generating device as described in the second aspect, wherein the image generating device is configured to output an image to a first target area.

[0111] In this embodiment, the image generating device has the same structure and function as the image generating device described in any embodiment of the second aspect, and will not be repeated here.

[0112] The movable device may be a vehicle such as a car, a ship, an airplane, or a movable device such as a robot. The first target area may be an area that can be used to transmit light, such as a windshield, a skylight, a car window, a transflective panel, or the ground.

[0113] For example, the mobile device is a car, the first target area is the car windshield, a black area is set at the bottom of the car windshield or other positions, and the image is projected onto the car windshield by the image generating device 1000, so that the information is displayed in this specific area. This is PHUD, which is a panoramic head-up display. As an innovation in HUD technology, PHUD reduces the error caused by optical reflection, has higher display clarity and stability, and more accurate information reading.

[0114] In a fifth aspect, an embodiment of the present application further provides a movable device, comprising: a display system as in the third aspect; the display system is configured to output an image to a second target area.

[0115] In this embodiment, the display system has the same structure and function as the display system described in any embodiment of the third aspect, and will not be repeated here.

[0116] The movable device may be a vehicle such as a car, a ship, an airplane, or a movable device such as a robot. The second target area may be an area that can be used to transmit light, such as a windshield, a skylight, a car window, a transflective panel, or the ground.

[0117] For example, when the display system is an augmented reality head-up display (AR HUD) and the mobile device is a car, the target area includes one or more of the car windshield, car window, and car sunroof. If the display system is a light field screen, the target area is a transflective panel, which can be set in the co-pilot seat, car seat back, car seat headrest, etc., without limitation.

[0118] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lighting module, characterized in that: It includes a light source, a collimating element, a light homogenizing element and a diffusion element which are arranged in sequence; The light source includes a first light-emitting unit, the collimating element includes a first total internal reflection lens, the first light-emitting unit is arranged corresponding to the first total internal reflection lens, the first total internal reflection lens has a first central axis, and the first central axis is inclined relative to the optical axis of the light homogenizing element; The first total internal reflection lens is configured to collimate the light emitted by the first light emitting unit; The light homogenizing element is configured to homogenize the light collimated by the collimating element; The diffusion element is configured to diffuse the light homogenized by the light homogenizing element.

2. The lighting module according to claim 1, characterized in that: On a projection plane perpendicular to a first direction of the light homogenizing element, the first central axis is arranged to be tilted clockwise or counterclockwise at a first angle relative to the optical axis of the light homogenizing element; And / or, on a projection plane perpendicular to a second direction of the light homogenizing element, the first central axis is tilted clockwise or counterclockwise at a second angle relative to the optical axis of the light homogenizing element.

3. The lighting module according to claim 2, characterized in that: The first angle is greater than 0° and the first angle is less than or equal to a first preset angle; And / or, the second angle is greater than 0° and the second angle is less than or equal to a second preset angle.

4. The lighting module according to claim 3, characterized in that: There are a plurality of first light-emitting units, a plurality of first total internal reflection lenses, and one first light-emitting unit is correspondingly arranged with one first total internal reflection lens; In the first direction of the light homogenizing element, at least two of the first total internal reflection lenses are symmetrical about a first preset center plane, and the first preset center plane is perpendicular to the first direction; and / or; In the second direction of the light homogenizing element, at least two of the first total internal reflection lenses are symmetrical about a second preset center plane, and the two first total internal reflection lenses are inclined in opposite directions, and the second preset center plane is perpendicular to the second direction.

5. The lighting module according to claim 1, characterized in that: The light source further includes a second light emitting unit, and the collimating element further includes a second total internal reflection lens; The second light emitting unit is arranged corresponding to the second total internal reflection lens. The second total internal reflection lens has a second central axis. The second central axis is arranged parallel to the optical axis of the light homogenizing element.

6. The lighting module according to any one of claims 1 to 5, characterized in that: The light homogenizing element has a first surface close to the light source and a second surface far from the light source; A microlens array is disposed on the second surface.

7. The lighting module according to claim 6, characterized in that: The second surface is a flat surface or a curved surface.

8. The lighting module according to claim 6, characterized in that: The collimating element is disposed in contact with the first surface.

9. An image generating device, characterized in that: include: A display panel, a lighting module according to any one of claims 1 to 8; The lighting module is arranged on the light incident side of the display panel.

10. A display system, characterized in that: An image generating device comprising an emission device, as claimed in claim 9; The image generating device is arranged on the light incident side of the emitting device.

11. A movable device, characterized in that: include: The image generating device of claim 9, wherein the image generating device is configured to output the image to the first target area; and / or, comprising the display system as claimed in claim 10; The display system is configured to output the image to a second target area.

Images