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

Abstract

The utility model 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] Embodiments of the present application relate to the field of optical technology, in particular to an illumination module, an image generation device, a display system and a mobile device. BACKGROUND

[0002] The backlighting system in the head-up display is used to illuminate the image information containing the instruments, navigation, so that this part of information can be projected to the vicinity of the driver's line of sight through the imaging light path, avoiding the driver's frequent looking down at the instrument panel while driving. The virtual image projected in front of the windshield of the car must require the brightness uniformity perceived by the human eye, avoid glare, and ensure the safety of driving.

[0003] However, there is a problem of insufficient light intensity in the current head-up display in a large-angle visible range. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide an illumination module, an image generation device, a display system and a mobile device, which can improve the illumination intensity of the large-angle outgoing light of the illumination module, thereby improving the light intensity in the large-angle visible range.

[0005] In a first aspect, an embodiment of the present application provides an illumination module, comprising a light source, a collimating element, a light uniformizing element and a diffusion 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 correspondingly to the first total internal reflection lens, the first total internal reflection lens has a first central axis, the first central axis is arranged obliquely relative to the optical axis of the light uniformizing element; the first total internal reflection lens is configured to collimate the light emitted by the first light emitting unit; the light uniformizing element is configured to uniformize the light collimated by the collimating element; and the diffusion element is configured to diffuse the light uniformized by the light uniformizing element.

[0006] In one or more embodiments, in a projection plane perpendicular to a first direction of the light uniformizing element, the first central axis is arranged obliquely by a first included angle clockwise or counterclockwise relative to the optical axis of the light uniformizing element; and / or, in a projection plane perpendicular to a second direction of the light uniformizing element, the first central axis is arranged obliquely by a second included angle clockwise or counterclockwise relative to the optical axis of the light uniformizing element.

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

[0008] In one or more embodiments, the number of the first light emitting units is plural, the number of the first total internal reflection lenses is plural, one of the first light emitting units is arranged correspondingly to one of the first total internal reflection lenses; in a first direction of the light uniforming element, at least two of the first total internal reflection lenses are symmetric about a first preset central plane, the first preset central plane is perpendicular to the first direction; and / or; in a second direction of the light uniforming element, at least two of the first total internal reflection lenses are symmetric about a second preset central plane, the second preset central plane is perpendicular to the second direction.

[0009] In one or more embodiments, the light source further comprises a second light emitting unit, the collimating element further comprises a second total internal reflection lens; the second light emitting unit is arranged correspondingly 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 uniforming element.

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

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

[0012] In one or more embodiments, the collimating element is arranged in abutment with the first face.

[0013] In a second aspect, the embodiments of the present application further provide an image generating apparatus, comprising: a display panel, and the illumination module according to any one of the above embodiments. The illumination module is arranged on the light-incident side of the display panel.

[0014] In a third aspect, the embodiments of the present application further provide a display system, comprising: an exit device, and the image generating apparatus according to the second aspect. The image generating apparatus is arranged on the light-incident side of the exit device.

[0015] In a fourth aspect, the embodiments of the present application further provide a movable device, comprising:

[0016] The image generating apparatus according to the second aspect is configured to output an image to a first target area, and / or comprises the display system according to the third aspect; the display system is configured to output an image to a second target area.

[0017] The beneficial effects of the embodiments of the present application are that the present application provides a lighting module, an image generation device, a display system and a mobile device. The lighting module comprises a light source, a collimating element, a light homogenizing element and a diffusion element arranged in sequence. The light source comprises a first light emitting unit, and the collimating element comprises a first total internal reflection lens. The first light emitting unit is arranged correspondingly 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 an optical axis of the light homogenizing element. The first total internal reflection lens is configured to collimate 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. By arranging the first total internal reflection lens obliquely, the propagation angle of the collimated light can be changed. The illumination uniformity can be improved, and the illumination intensity of the large-angle outgoing light of the lighting module can be improved. The lighting module can be applied to the image generation device or the display system, and the illumination intensity of the large-angle visual range can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document. These example are not intended to limit the application, but to clarify and explain the principles of the at least one embodiment. The accompanying drawings include reference symbols in which identical references numbers designate corresponding, but not necessarily identical, elements in the various figures. The figures in the drawings are not to scale.

[0019] Figure 1 A structural block diagram of a lighting module provided by the embodiments of the present application is provided.

[0020] Figure 2 A structural diagram of a lighting module provided by the embodiments of the present application is provided.

[0021] Figure 3 A partial structural diagram of a lighting module provided by the embodiments of the present application is provided.

[0022] Figure 4 A partial structural diagram of another lighting module provided by the embodiments of the present application is provided.

[0023] Figure 5 A partial structural diagram of another lighting module provided by the embodiments of the present application is provided.

[0024] Figure 6 A structural diagram of another lighting module provided by the embodiments of the present application is provided.

[0025] Figure 7 A partial structural diagram of another lighting module provided by the embodiments of the present application is provided.

[0026] Figure 8 A structural diagram of another lighting module provided by the embodiments of the present application is provided.

[0027] Figure 9A structural diagram of a light uniformization element provided by an embodiment of the present application;

[0028] Figure 10 Another structural diagram of a light uniformization element provided by an embodiment of the present application;

[0029] Figure 11 A structural diagram of a lighting module provided by another embodiment of the present application;

[0030] Figure 12 A structural block diagram of an image generation device provided by an embodiment of the present application;

[0031] Figure 13 A structural block diagram of a display system provided by an embodiment of the present application;

[0032] Figure 14 A structural diagram of a fifth lighting module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application will be 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 the other element or one or more intervening elements can be present therebetween. When an element is described as "electrically connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in the present specification indicate the orientation or positional relationship shown in the drawings and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance.

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

[0035] In the related art, the lighting module adopts a full reflection lens, a compound eye lens, a plane mirror and multiple shaping lenses to uniform light and control the angle size and direction of the light beam. Although this method can achieve a certain degree of uniform light effect, the use of a large number of optical elements leads to a large system size and high cost, and the light absorption loss of each lens is large, resulting in low utilization of light energy.

[0036] To solve the above technical problems, the present application provides a lighting module, an image generation device, a display system and a mobile device. By tilting the first total internal reflection lens, the direction of the collimated light is changed. Subsequently, when collimating the light through multiple total internal reflection lens arrays, the present application can fill the corresponding areas of the gaps between the multiple total internal reflection lens arrays with light, improve the uniform light effect, and increase the illumination intensity of the large-angle outgoing light of the lighting module. Subsequently, when applied to an image generation device or a display system, the illumination intensity of the large-angle visual range can be improved.

[0037] In a first aspect, the present application provides a lighting module, which comprises a light source 10, a collimating element 20, a uniform light element 30 and a diffusion element 40 arranged in sequence. Figure 1 The lighting module 100 comprises a light source 10, a collimating element 20, a uniform light element 30 and a diffusion element 40 arranged in sequence.

[0038] The light source 10 comprises a first light-emitting unit 11, the collimating element 20 comprises a first total internal reflection lens 21, and the first light-emitting unit 11 is arranged correspondingly to 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 arranged obliquely to the optical axis O1 of the uniform light 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 uniform light element 30 is configured to uniform the light collimated by the collimating element 20. The diffusion element 40 is configured to diffuse the light uniformed by the uniform light element 30.

[0040] The first light-emitting unit 11 comprises 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 adjust the direction of the light emitted by the first light emitting unit 11 by using the total reflection principle of light, so that the light propagates in the form of parallel light or approximately parallel light, thereby achieving 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, which 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 change any optical properties. The first total internal reflection lens 21 can collect and refract light, improve the light efficiency of the light source 10, reduce light loss and improve uniformity, and can achieve near-light compensation and far-light enhancement. Moreover, the first total internal reflection lens 21 has a small volume, which reduces the volume of the illumination module 100, and the illumination module 100 can be applied to miniaturized design in the future.

[0042] The light homogenizing element 30 further processes the collimated light to make the distribution of the light on the output surface more uniform, which can ensure the consistency of the light intensity in the illumination area and reduce the occurrence of uneven light and dark. The light homogenizing element 30 can use a microlens array, a light guide tube, etc. 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 change any 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 that has been homogenized, so that the distribution range of the light on the output surface of the illumination 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, etc. The diffusion element 40 is arranged obliquely or vertically relative to the optical axis O1 of the light homogenizing element 30, so as to adapt to the display panel arranged obliquely or vertically relative to the optical axis O1 of the light homogenizing element 30.

[0044] When collimating by arraying a plurality of first total internal reflection lenses (21a, 21b, …, 21p), Figure 3As shown, in the first direction x of the light homogenizing element 30, there is an arrangement gap between 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 arranged to be inclined, the light intensity of the area corresponding to the subsequent arrangement gap 210 will be significantly weaker than the light intensity of the area corresponding to the first total internal reflection lens. In the present application, by arranging the first total internal reflection lens 21 to be inclined, the direction of the collimated light is changed, so that the light spot emitted by the first total internal reflection lens 21 overlaps with the area corresponding to at least one arrangement gap 210, effectively increasing the light intensity of the area corresponding to the arrangement gap 210, thereby improving the uniformity of the light-emitting surface of the illumination module 100 and improving the light homogenizing effect. Moreover, in the present application, the direction of the light is changed without using a shaping lens, thereby reducing the number of optical elements and the volume and weight of the system. This facilitates the miniaturization and lightweight design of the illumination module 100, reduces energy loss, and improves the utilization of light energy, thereby reducing the energy consumption of the system and improving the brightness and contrast of the display system. In addition, the illumination module 100 provided by the present application does not require the use of expensive new optical elements, and can directly use the total internal reflection lens structure in the prior art, thereby reducing costs and facilitating large-scale application.

[0045] Moreover, the light intensity of the large-angle emitted light of the illumination module can be improved, i.e., the light intensity of the light with a large exit angle is improved. In this way, when the human eye is in a large-angle viewing range (a large field of view range), such as when the human eye is in an edge field of view range, a picture with sufficient light intensity can still be observed, and subsequent application in an image generating device or a display system can improve the light intensity in the large-angle viewing range. The exit angle is the angle between the light emitted by the light source 10 to the diffusion element 40 and the optical axis of the light homogenizing element O1.

[0046] In some embodiments, the first central axis O2 is arranged to be inclined by the first included angle θ1 clockwise or counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in a projection plane perpendicular to the first direction x of the light homogenizing element 30.

[0047] The first direction x can be the direction of the long side of the light-emitting surface of the light homogenizing element 30, and the first direction x can be the direction of the long side of the light-emitting surface of the light homogenizing element 30. Figure 4 In the embodiment shown, the first central axis O2 is arranged to be inclined by the first included angle θ1 clockwise relative to the optical axis O1 of the light homogenizing element 30.

[0048] By arranging the first central axis O2 to be deflected relative to 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 light homogenizing effect.

[0049] In some embodiments, the first central axis O2 is arranged to be inclined clockwise or counterclockwise relative to the optical axis O1 of the light homogenizing element 30 by a second included angle θ2 in a projection plane perpendicular to the second direction y of the light homogenizing element 30.

[0050] The second direction y can be a direction of a short side of an exit plane of the light homogenizing element 30, and the first direction x can be a direction of a long side of the exit plane. Figure 5 In the illustrated embodiment, the first central axis O2 is arranged to be inclined clockwise relative to the optical axis O1 of the light homogenizing element 30 by the second included angle θ2.

[0051] By deflecting the first central axis O2 relative to 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, so that the distribution of the light can be effectively controlled, and the light homogenizing effect can be improved.

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

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

[0054] By limiting the range of the first included angle and the second included angle, it can be ensured that the light emitted by the illumination module 100 can be irradiated to the display panel at the optimal angle and distribution, so as to provide clear, uniform and high-quality display effect. At the same time, it can avoid excessive inclination or deviation of the light, reduce the loss of the light, and further improve the overall optical performance.

[0055] In some embodiments, the number of the first light emitting units 11 is a plurality, the number of the first total internal reflection lenses 21 is a plurality, and one first light emitting unit 11 is arranged to correspond 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 a first preset central plane S1, and the first preset central plane S1 is perpendicular to the first direction x.

[0056] Specifically, the two first total internal reflection lenses 21 symmetrical about the first preset central plane S1 are opposite in the tilting direction, the first included angle of the two first total internal reflection lenses 21 symmetrical about the first preset central plane S1 is equal, and / or the second included angle of the two first total internal reflection lenses 21 symmetrical about the first preset central plane S1 is 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] Specifically, referring to 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, in Figure 3 , the first direction x is a horizontal right direction, for example, the first total internal reflection lens 21a in the first row is symmetrical about the first preset central plane S1 with the eighth total internal reflection lens 21h in the first row.

[0059] That is, if the first center axis O2 of the first total internal reflection lens 21a is arranged to tilt the first included angle θ1 clockwise relative to the optical axis O1 of the light homogenizing element 30 on the projection plane perpendicular to the first direction x of the light homogenizing element 30, then the first center axis O2 of the first total internal reflection lens 21h is arranged to tilt the first included angle θ1 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 on the projection plane perpendicular to the first direction x of the light homogenizing element 30.

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

[0061] If the first central axis O2 of the first total internal reflection lens 21a is arranged to be inclined by the first included angle θ1 clockwise relative to the optical axis O1 of the light homogenizing element 30 in a projection plane perpendicular to the first direction x of the light homogenizing element 30, and is arranged to be inclined by the second included angle θ2 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in 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 arranged to be inclined by the first included angle θ1 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in a projection plane perpendicular to the first direction x of the light homogenizing element 30, and is arranged to be inclined by the second included angle θ2 clockwise relative to the optical axis O1 of the light homogenizing element 30 in a projection plane perpendicular to the second direction y 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 central plane S1, and the symmetrical relationship is as described above for the first total internal reflection lenses 21a and 21h, which will not be repeated here.

[0063] Further, whether the corresponding two 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 central plane S1 needs to be determined according to the actual optical path design. For example, when the diffusion element 40 is not inclined in the first direction x, i.e., when the incident plane (or the exit plane) of the diffusion element 40 is arranged 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 central plane S1. For example, when the diffusion element 40 is inclined in the first direction x, i.e., when the incident plane (or the exit plane) of the diffusion element 40 is not arranged 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) can not be symmetrical about the first preset central plane S1.

[0064] Through the above arrangement, 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, uneven brightness, and improves the light uniformity of the entire illumination module.

[0065] In the above embodiments, the number of first light emitting units and first total internal reflection lenses is not limited, and can be adjusted in number and arrangement 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 symmetric about a second preset central plane S2, and the second preset central plane S2 is perpendicular to the second direction y.

[0067] Specifically, the two first total internal reflection lenses 21 symmetric about the second preset central plane S2 have opposite tilting directions, the two first total internal reflection lenses 21 symmetric about the second preset central plane S2 have equal first included angles, and / or the two first total internal reflection lenses 21 symmetric about the second preset central plane S2 have equal second included angles, and the two first total internal reflection lenses 21 have opposite tilting directions.

[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] Specifically, referring to Figure 6 , the number of the first light emitting units and the first total internal reflection lenses is three, wherein, in Figure 6 , the second direction y is a vertically downward direction, for example, the first total internal reflection lens 21q and the first total internal reflection lens 21s are symmetric about the second preset central plane S2, and the two first total internal reflection lenses have equal first included angles and / or equal second included angles.

[0070] That is, if the first center axis O2 of the first total internal reflection lens 21q is arranged to tilt the first included angle θ1 clockwise relative to the optical axis O1 of the light homogenizing element 30 in the projection plane perpendicular to the first direction x of the light homogenizing element 30, then the first center axis O2 of the first total internal reflection lens 21s is arranged to tilt the first included angle θ1 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in the projection plane perpendicular to the first direction x of the light homogenizing element 30.

[0071] If the first center axis O2 of the first total internal reflection lens 21q is arranged to tilt the second included angle θ2 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in the projection plane perpendicular to the second direction y of the light homogenizing element 30, then the first center axis O2 of the first total internal reflection lens 21s is arranged to tilt the second included angle θ2 clockwise relative to the optical axis O1 of the light homogenizing element 30 in the projection plane perpendicular to the second direction y of the light homogenizing element 30.

[0072] If the first central axis O2 of the first total internal reflection lens 21q is arranged to be inclined by the first included angle θ1 clockwise relative to the optical axis O1 of the light homogenizing element 30 in 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 arranged to be inclined by the second included angle θ2 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in 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 arranged to be inclined by the first included angle θ1 counterclockwise relative to the optical axis O1 of the light homogenizing element 30 in 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 arranged to be inclined by the second included angle θ2 clockwise relative to the optical axis O1 of the light homogenizing element 30 in a projection plane perpendicular to the second direction y of the light homogenizing element 30.

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

[0074] Through the above arrangement, 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 the problems such as light spot, uneven brightness, etc., and improve the light uniformity of the whole illumination module.

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

[0076] In some embodiments, the light source 10 further comprises a second light emitting unit, referring to Figure 6 The collimating element 20 further comprises a second total internal reflection lens 22a, the second light emitting unit is arranged to correspond to the second total internal reflection lens 22a, and the second total internal reflection lens 22a has a second central axis arranged to be 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 central plane S2.

[0078] In some embodiments, referring to Figure 7The light source 10 further comprises a second light emitting unit, and the collimating element 20 further comprises a second total internal reflection lens (22b, 22c); the second light emitting unit is arranged correspondingly to the second total internal reflection lens (22b, 22c), and the second total internal reflection lens (22b, 22c) has a second central axis which is arranged in parallel to the optical axis O1 of the light homogenizing element 30.

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

[0080] The second light emitting unit comprises 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 adjust the direction of the light emitted by the second light emitting unit by using the principle of total reflection of light, so that the light propagates in the form of parallel light or approximately parallel light, thereby realizing collimation of the light. The second central axis of the second total internal reflection lens (22a, 22b, 22c) is the perpendicular line 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 light, improve the light efficiency of the light source 10, reduce light loss and improve uniformity, and can realize low-beam light compensation and high-beam light enhancement. Moreover, the second total internal reflection lens has a small volume and can be applied to miniaturized design in the future.

[0082] The second central axis is arranged in 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 arranged to be deflected from the optical axis O1 of the light homogenizing element 30. By increasing the second light emitting unit and the second total internal reflection lens (22a, 22b, 22c), the illumination module 100 can adjust the brightness and distribution of the light source 10 as needed, thereby increasing the flexibility and expansibility of the illumination module 100 and improving the application scenarios of the illumination module 100.

[0083] In some embodiments, the light homogenizing element 30 has a first face S3 close to the light source 10 and a second face S4 away from the light source 10; and the second face S4 is provided with a microlens array.

[0084] The microlens array refers to an optical element composed of a large number of micro lenses arranged in a regular or irregular manner. The micro lenses can be convex micro lenses, and each micro lens can collimate light, so that the light passing through the microlens array can propagate in a more uniform and parallel manner.

[0085] In the present embodiment, the light uniformization element 30 provided with the microlens array is selected to perform light uniformization. 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 embodiments, referring to Figure 9 , the second surface S4 of the light uniformization element 30 is a plane.

[0087] By adopting a plane design, the processing cost can be reduced, and the cost of the illumination module 100 can be reduced.

[0088] In some embodiments, referring to Figure 10 , the second surface S4 of the light uniformization 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 effect and light uniformization effect.

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

[0091] In some embodiments, referring to Figure 8 , the collimating element 20 and the first surface S3 of the light uniformization element 30 are attached.

[0092] The collimating element 20 and the first surface S3 of the light uniformization element 30 can be attached by optical glue, thereby reducing the volume of the illumination module 100.

[0093] In some embodiments, referring to Figure 2 , the first surface S3 of the light uniformization element 30 is a non-plane, such as the first surface S3 of the light uniformization element 30 is composed of at least two planes with different inclination angles.

[0094] In some embodiments, referring to Figure 6 and Figure 8 , the first surface S3 of the light uniformization element 30 is a plane, and the attachment surface of the first total internal reflection lens 21 needs to be cut to adapt to the first surface S3 of the light uniformization element 30.

[0095] In a second aspect, the present application also provides an image generating device 1000, referring to Figure 12The image generating apparatus 1000 comprises a display panel 200 and the illumination module 100 according to any one of the above embodiments. The illumination module 100 is arranged on the light-incident side of the display panel 200. The diffusion element 40 is attached to the display panel 200, i.e., the display panel 200 can be arranged in the first direction x with or without inclination or arranged in the second direction y with or without inclination.

[0096] Further, referring to Figure 3 When the display panel 200 is arranged in the first direction x without inclination, 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 central plane S1.

[0097] Further, referring to Figure 3 When the display panel 200 is arranged in the first direction x with inclination, 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 arranged without symmetry about the first preset central plane S1.

[0098] Further, referring to Figure 6 When the display panel 200 is arranged in the second direction y without inclination, the two first total internal reflection lenses 21q and 21s can be symmetrically arranged about the second preset central plane S2. The first total internal reflection lens 21a itself can be symmetric about the second preset central plane S2.

[0099] Further, referring to Figure 11 When the display panel 200 is arranged in the second direction y with inclination, the first total internal reflection lenses 21q and 21s can be arranged without symmetry about the second preset central plane S2. The first total internal reflection lens 21a itself can also be arranged without symmetry about the second preset central plane S2.

[0100] In this embodiment, the illumination module 100 has the same structure and function as the illumination module 100 according to any one of the embodiments of the first aspect, which will not be described here again.

[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 apparatus 1000, the light rays output by the illumination module 100 are projected onto the display panel 200, and then excite the generation of image light beams.

[0103] In a third aspect, the embodiments of the present application also provide a display system 10000, referring to Figure 13 The display system 10000 includes an exit device 2000 and the image generating apparatus 1000 of the second aspect. The image generating apparatus 1000 is arranged on the light entrance side of the exit device 2000.

[0104] In the present embodiment, the image generating apparatus 1000 has the same structure and function as the image generating apparatus 1000 of any one of the embodiments of the second aspect, and will not be described here.

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

[0106] For example, the display system 1000 is an augmented reality head-up display (AR HUD), and the exit device includes a mirror mechanism including at least one mirror, which can be a curved mirror or a plane mirror, and can be rotatable or non-rotatable. The image generating apparatus projects image light onto the mirror mechanism, which deflects the image light, and finally projects the image light onto a target area for image display. The AR HUD can include the illumination module of any one of the embodiments of the present application, which has the same structure and function as the illumination module 100 of any one of the embodiments of the first aspect.

[0107] Further, referring to Figure 2 or Figure 8 , the AR HUD includes the illumination module 100 including the first light emitting unit 11, the first total internal reflection lens 21, the light uniformization element 30, and the diffusion element 40, which can be arranged in the manner described above and will not be described here. In the illumination module 100, the light rays emitted by the first light emitting unit 11 are incident to the human eye after passing through the first total internal reflection lens 21, the light uniformization element 30, the diffusion element 40, the display panel, and the exit device.

[0108] In the AR HUD, among the light emitted by the first light emitting unit 11, the light intensity of the light at the optical axis is the largest, and the human eye visible range has an angle deviation from the optical axis of the light emitted by the first light emitting unit 11, resulting in insufficient light intensity of the light emitted by the first light emitting unit 11 in the human eye visible range, which will cause insufficient brightness of the image seen by the user, and further affect the use effect. In the present embodiment, by using the first total internal reflection lens 21 arranged at an inclination in the illumination 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 human eye visible range, the propagation direction of the light emitted by the first light emitting unit 11 is changed, and the exit angle of the light emitted by the first total internal reflection lens 21 will be larger, thereby improving the illumination intensity of the large-angle exit light of the illumination module 100, i.e., improving the illumination intensity of the light with a larger exit angle, and improving the illumination intensity of the large-angle visible range of the AR HUD. In this way, when the human eye is in the large-angle visible range (large field of view range) when using the AR HUD, such as when the human eye is in the edge field of view range, a picture with sufficient brightness can still be observed. In addition, by using the first total internal reflection lens 21 arranged at an inclination, the direction of the collimated light is changed, which can effectively enhance the illumination intensity of the region corresponding to the arrangement gap when the total internal reflection lens is arranged, so as to improve the uniformity of the light exit surface of the AR HUD and improve the uniform light effect.

[0109] Further, in some embodiments, when the illumination module 100 adopted by the AR HUD adopts the uniform light element 30 as shown in Figure 10 , the first surface S3 of the uniform light element 30 is arranged close to the light source 10, and the second surface S4 (curved surface) of the uniform light element 30 is arranged away from the light source 10, as shown in Figure 14 , by designing the curved surface parameters of the second surface S4 of the uniform light element 30, and the second surface S4 of the uniform light element 30 and the first surface S3 of the uniform light element 30 form a wedge surface, the light emitted by the first total internal reflection lens 21 can be deflected for the second time when passing through the uniform light element 20, further increasing the exit angle of the light emitted by the illumination module 100, and further improving the illumination intensity of the large-angle exit light of the illumination module 100, i.e., further improving the illumination intensity of the light with a larger exit angle, and further improving the illumination intensity of the large-angle visible range.

[0110] In a fourth aspect, the embodiments of the present application also provide a movable device, which comprises an image generation device as described in the second aspect, and the image generation device is configured to output an image to a first target area.

[0111] In the present embodiment, the image generation device has the same structure and function as the image generation device described in any one of the embodiments of the second aspect, and will not be described here.

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

[0113] For example, the movable device is a car, and the first target area is a windshield of the car. A black area is arranged at the bottom of the windshield or any other position. The image generation device 1000 projects an image to the windshield, so that information is displayed in the specific area. This is a PHUD, which is a panoramic head-up display. As an innovation of the HUD technology, the PHUD reduces the error caused by optical reflection, has higher display clarity and stability, and is more accurate in information reading.

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

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

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

[0117] For example, when the display system is an augmented reality head-up display (AR HUD) and the movable device is a car, the target area includes one or more of a windshield of the car, a window of the car, and a sunroof of the car. When the display system is a light field screen, the target area is a transflective panel, which can be arranged at a position such as a co-driver seat of the car, a back of a seat of the car, a headrest of the seat of the car, etc., without limitation.

[0118] It should be noted that the apparatus embodiments described above are only schematic and that in reality the units described as separate units can or can not be physically separate and can or can not form physical units, i.e., some or all of the units can be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to the actual needs to achieve the purpose of the embodiments.

[0119] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; under the idea of the present application, the technical features in the above examples or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lighting module, characterized by 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 correspondingly with 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 light uniformizing element. The first total internal reflection lens is configured to collimate the light emitted by the first light emitting unit. The light uniformizing element is configured to uniformize the light collimated by the collimating element. The diffusing element is configured to diffuse the light uniformized by the light uniformizing element.

2. The illumination module according to claim 1, wherein, in a projection plane perpendicular to a first direction of the light uniformizing element, the first central axis is arranged obliquely relative to the optical axis of the light uniformizing element by a first included angle clockwise or counterclockwise; and / or, in a projection plane perpendicular to a second direction of the light uniformizing element, the first central axis is arranged obliquely relative to the optical axis of the light uniformizing element by a second included angle clockwise or counterclockwise.

3. The illumination module according to claim 2, wherein, the first included angle is greater than 0° and less than or equal to a first preset angle; and / or, the second included angle is greater than 0° and less than or equal to a second preset angle. The number of the first light emitting units is a plurality, and the number of the first total internal reflection lenses is a plurality, one first light emitting unit is arranged correspondingly with one first total internal reflection lens; in a first direction of the light uniformizing element, at least two first total internal reflection lenses are symmetric about a first preset central plane, and the first preset central plane is perpendicular to the first direction; and / or; in a second direction of the light uniformizing element, at least two first total internal reflection lenses are symmetric about a second preset central plane, and the two first total internal reflection lenses are opposite in the oblique direction, and the second preset central plane is perpendicular to the second direction.

4. The lighting module according to claim 3, characterized in that The light source further comprises a second light emitting unit, and the collimating element further comprises a second total internal reflection lens. The second light emitting unit is arranged correspondingly with 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 relative to the optical axis of the light uniformizing element. The light uniformizing element has a first surface close to the light source and a second surface away from the light source. The second surface is provided with a microlens array.

5. The lighting module of claim 1, wherein, 7. The illumination module according to claim 6, wherein, the second surface is a plane or a curved surface.

6. The lighting module according to any one of the claims 1-5, characterized in that, The collimating element is arranged in close contact with the first surface. The display panel, the illumination module according to any one of claims 1-8; and The illumination module is arranged on the light-incident side of the display panel. The image generation device according to claim 9 is arranged on the light-incident side of the exit device.

8. The lighting module according to claim 6, characterized in that The image generation device according to claim 9 is configured to output an image to a first target area; and / or, the display system according to claim 10.

9. An image generation apparatus characterized by comprising: ​ ​ ​ 10. A display system characterized by, ​ ​ 11. A mobile device, comprising: ​ ​ ​ The display system is configured to output the image to a second target area.

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