CN115903224A - Light source device, display device, head-up display system and vehicle - Google Patents

Abstract

The invention discloses a light source device, a display device, a head-up display system and a vehicle, wherein the light source device comprises: the light source structure is used for emitting light rays, and the light rays are source light rays; and a light guide structure comprising a light entrance region allowing at least part of the light to enter the light guide structure and comprising a plurality of light out-coupling portions, wherein light incident at each of the at least part of the light out-coupling portions is partially reflected at the light out-coupling portion and is partially out-coupled by the light out-coupling portion, the light guide structure comprising a light homogenizing portion configured to homogenize the light before incident to the light out-coupling portion, and/or the plurality of light out-coupling portions of the light guide structure comprising a plurality of transflective elements which enable partial reflection and partial out-coupling; wherein an orthographic projection of the light source structure on the light guiding structure is at least partially within the light guiding structure. The scheme that this disclosure provided makes the structure of light source device more compact.

Description

Light source device, display device, head-up display system and vehicle

Technical Field

The invention belongs to the technical field of optical display, and particularly relates to a light source device, a display device, a head-up display system and a vehicle.

Background

The HUD (head up display) is through the optical design of reflective, on finally projecting the light that the image source sent imaging window (imaging plate, windshield etc.), the picture just can be directly seen to user (for example driver) need not to hang down to promote user experience. For example, HUD can avoid the driver to drive the in-process and look down the distraction that the panel board leads to, improves and drives factor of safety, also can bring better driving experience simultaneously.

For example, taking the HUD based on curved mirror reflection imaging as an example, the light emitted from the HUD image source is reflected by the curved mirror and then emitted, and the emitted light may be reflected on the imaging window and remain at one side of the cockpit, and enter the eyes of the user (e.g. driver). These rays of light that enter the eyes of the user make it possible for the user to see the virtual image that is spatially presented on the other side of the imaging window by the picture displayed on the HUD image source.

Disclosure of Invention

The invention provides a light source device, a display device, a head-up display system and a vehicle.

At least one embodiment of the present disclosure provides a light source device including: the light source structure is used for emitting light rays, and the light rays are source light rays; and a light guide structure comprising a light entrance region allowing at least part of the light to enter the light guide structure and comprising a plurality of light out-coupling portions, wherein light incident at each of the at least part of the light out-coupling portions is partially reflected at the light out-coupling portion and is partially out-coupled by the light out-coupling portion, the light guide structure comprising a light uniformizing portion configured to homogenize light before incident to the light out-coupling portion, and/or the plurality of light out-coupling portions of the light guide structure comprising a plurality of transflective elements that achieve the partial reflection and partial out-coupling; wherein an orthographic projection of the light source structure on the light guiding structure is at least partially within the light guiding structure.

For example, in an embodiment of the present disclosure, the plurality of light outcoupling portions include a first light outcoupling portion group and a second light outcoupling portion group that are sequentially arranged in an arrangement direction of the plurality of light outcoupling portions, the first light outcoupling portion group includes a plurality of first light outcoupling portions, and the second light outcoupling portion group includes a plurality of second light outcoupling portions; the light incident region of the light guide structure is located between the first light out-coupling portion group and the second light out-coupling portion group in the arrangement direction of the plurality of light out-coupling portions, and light entering the light guide structure from the light incident region of the light guide structure is coupled out by the first light out-coupling portion group and the second light out-coupling portion group.

For example, in an embodiment of the present disclosure, the first light out-coupling portion group includes a plurality of first transflective elements, the second light out-coupling portion group includes a plurality of second transflective elements, and the plurality of first transflective elements and the plurality of second transflective elements are inclined in opposite directions with respect to an arrangement direction of the plurality of light out-coupling portions.

For example, in any of the above embodiments of the present disclosure, the light source structure includes a first light source portion configured to emit a first source light, a first portion of the first source light is located in a light path of at least one first light outcoupling portion of the first light outcoupling portion group, and a second portion of the first source light is located in a light path of at least one second light outcoupling portion of the second light outcoupling portion group; or, the light source structure includes a first light source portion and a second light source portion configured to emit a first source light and a second source light of the source light, respectively, where the first source light emitted by the first light source portion is at least located in a light path where at least one first light outcoupling portion of the first light outcoupling portion group is located, and the second source light emitted by the second light source portion is at least located in a light path where at least one second light outcoupling portion of the second light outcoupling portion group is located.

For example, in any of the above embodiments of the present disclosure, a light splitting structure and a polarization conversion structure are further included; the light splitting structure is configured to split a light ray incident to the light splitting structure into a first light ray having a first polarization characteristic and a second light ray having a second polarization characteristic, the first light ray and the second light ray being polarized light having different polarization characteristics; the polarization conversion structure is configured to perform at least one polarization conversion process on the light incident to the polarization conversion structure to obtain third light, and the third light is polarized light with the second polarization characteristic; the first light corresponds to the first light outcoupling unit group, the second light corresponds to the second light outcoupling unit group, and the polarization conversion structure converts the first light before entering the first light outcoupling unit group or the first light outcoupled by the first light outcoupling unit group into the third light; or the first source light and the second source light are both divided into the first light and the second light, the third light obtained after the first light of the first source light is converted by the polarization conversion structure and the second light of the first source light are transmitted to the first light coupling-out part group, and the third light obtained after the first light of the second source light is converted by the polarization conversion structure and the second light of the second source light are transmitted to the second light coupling-out part group.

For example, in any of the above embodiments of the present disclosure, the light splitting structure includes at least one light splitting element, and the first source light and the second source light are split by the same light splitting element or different light splitting elements; and/or the polarization conversion structure comprises at least one polarization conversion element, and the first light of the first source light and the first light of the second source light are subjected to polarization conversion by the same polarization conversion element or different polarization conversion elements.

For example, in any of the above embodiments of the present disclosure, the light guide structure further includes a light guide medium, and the light out-coupling portions are at least provided in the light guide medium, and the light enters the light guide medium and is linearly or reflectively propagated in the light guide medium in an arrangement direction of the light out-coupling portions.

For example, in any one of the above embodiments of the present disclosure, the light uniformizing section further comprises at least one first light uniformizing member, and the first light uniformizing member and the light out-coupling sections are stacked in a direction perpendicular to an arrangement direction of the light out-coupling sections or are sequentially arranged in the arrangement direction of the light out-coupling sections.

For example, in any of the above embodiments of the present disclosure, further comprising a light splitting structure and a polarization conversion structure; the light splitting structure is configured to split light incident to the light splitting structure into first light and second light, wherein the first light is polarized light with a first polarization characteristic, and the second light is polarized light with a second polarization characteristic; the polarization conversion structure is configured to change the polarization characteristic of the first light ray, so that the first light ray with the first polarization characteristic is converted into a third light ray which has the second polarization characteristic and is polarized after at least one polarization conversion treatment of the polarization conversion structure; the light splitting structure and the polarization conversion structure are arranged on the light inlet side or the light outlet side of the first light homogenizing piece, and the first light is converted by the polarization conversion structure and then propagates to at least part of the light out-coupling parts.

For example, in any one of the above embodiments of the present disclosure, the light uniformizing section further includes a second light uniformizing member, the light homogenized by the first light uniformizing member is divided into the first light and the second light by the light dividing structure, and the second light and the third light obtained by converting the first light by the polarization conversion structure are propagated to the side of the light coupling-out sections of the light guide structure after being homogenized by the second light uniformizing member.

For example, in any one of the above embodiments of the present disclosure, the second light uniformizing element and the plurality of light outcoupling portions are stacked in a direction perpendicular to an arrangement direction of the plurality of light outcoupling portions or are sequentially arranged in the arrangement direction of the plurality of light outcoupling portions; at least one of the first light homogenizing piece and the second light homogenizing piece comprises a first reflecting film and a second reflecting film which are arranged at intervals, and a light transmission space or an optical filling layer is arranged between the first reflecting film and the second reflecting film; and/or at least one of the first light homogenizing member and the second light homogenizing member comprises a transparent optical medium in which the light rays propagate.

For example, in any of the above embodiments of the present disclosure, the light source further includes a light collecting portion, wherein the light emitted from the light emitting side of the first light uniformizer propagates to the plurality of light outcoupling portions of the light guide structure after being subjected to light collecting processing by the light collecting portion.

For example, in any of the above embodiments of the present disclosure, the light-condensing portion includes a lens or a lens group including at least one of the lenses.

For example, in any of the above embodiments of the present disclosure, the lens is an eccentric lens, and a focal point of the eccentric lens is located on a side of a center line of the eccentric lens close to the center of the light guide structure.

For example, in any one of the above embodiments of the present disclosure, the light exit side of the first light uniformizer faces the side of the light guide structure where the plurality of light out-coupling portions are located; alternatively, the light guide structure further comprises a reflector, the light exit side of the first light spreader faces the reflector, and the reflector is configured to propagate the light emitted from the light exit side towards the side of the light guide structure where the plurality of light out-coupling portions are located.

For example, in any of the above embodiments of the present disclosure, the reflective element is a prism, and the light is reflected by the prism to the side of the light incident region of the light guide structure; or the reflecting piece and at least part of the first light homogenizing piece are integrally formed.

For example, in any of the above embodiments of the present disclosure, the light incident to the first diffuser has a non-zero preset divergence angle.

For example, in any of the above embodiments of the present disclosure, the predetermined divergence angle range is (0, 20), and/or the predetermined divergence angle is greater than or equal to a non-zero included angle between opposing main reflective surfaces of the first shim portion at least one of a light entrance side, a light exit side, and an intermediate side of the first shim portion, or the opposing main reflective surfaces of the first shim portion are parallel.

For example, in any one of the above embodiments of the present disclosure, each of the at least part of the light out-coupling portions transmits light incident to the light out-coupling portion, so that the transmitted light propagates to the next light out-coupling portion; in the plurality of light outcoupling portions, a transmittance of a first light outcoupling portion that receives the light is smaller than a reflectance thereof.

At least one embodiment of the present disclosure provides a display device including the above light source device.

For example, in the embodiment of the present disclosure, the light source device further includes an image generation unit, and the light emitted by the light source device is converted into image light by the image generation unit.

For example, in any of the above embodiments of the present disclosure, the display device further comprises a light converging element and a diffusing element; the light emitted by the light source device is processed by the light converging element and the diffusing element, then is transmitted to the image generating unit, and is converted into the image light after passing through the image generating unit.

At least one embodiment of the present disclosure provides a head-up display system, including an imaging window and a display device; wherein the imaging window is configured to reflect the image light exiting the display device to an eye-box area of the heads-up display system; the head-up display system comprises the light source device, or the head-up device system comprises the display device.

At least one embodiment of the present disclosure provides a vehicle including the light source device, or including the display device, or including the head-up display system.

In the above solution provided by the embodiment of the present disclosure, in the light coupling-out direction, an orthogonal projection of the light source structure on the light guide structure is at least partially located in the light guide structure, where the light coupling-out direction of the light guide structure is a thickness direction of the light source device, and a direction perpendicular to the light coupling-out direction is a width direction of the light source device. In the embodiment of the disclosure, the light source structure is arranged along the thickness direction of the light source device, so that the width of the light source device is effectively reduced, and the structure of the light source device is more compact.

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1a is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 1b is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 2a is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 2b is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 2c is a schematic structural diagram of a light source device according to an embodiment of the disclosure;

FIG. 2d is a schematic structural diagram illustrating a light source device according to an embodiment of the present disclosure;

FIG. 3a is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 3b is a schematic structural diagram illustrating a light source device according to an embodiment of the disclosure;

fig. 4a is a schematic view illustrating a light splitting structure and a polarization conversion structure in a light source device according to an embodiment of the disclosure;

fig. 4b is a schematic diagram illustrating a second light splitting structure and a polarization conversion structure in a light source device according to an embodiment of the disclosure;

fig. 4c is a schematic diagram showing a third light splitting structure and a polarization conversion structure in a light source device according to an embodiment of the disclosure;

fig. 4d shows a fourth schematic view of a light splitting structure and a polarization conversion structure in a light source device according to an embodiment of the disclosure;

FIG. 5a shows a schematic structural diagram of a light source device according to an embodiment of the present disclosure;

FIG. 5b is a schematic structural diagram of a light source device according to an embodiment of the disclosure;

FIG. 5c is a schematic structural diagram showing an eleventh exemplary light source device according to the present disclosure;

FIG. 6 is a diagram showing a twelfth example of the structure of a light source device according to the disclosure;

fig. 7 shows a schematic structural diagram thirteen of a light source device according to an embodiment of the disclosure;

FIG. 8 is a schematic diagram of a display device according to an embodiment of the present disclosure;

FIG. 9 shows a third schematic view of a display device according to an embodiment of the present disclosure;

FIG. 10 shows a schematic diagram of a head-up display system according to an embodiment of the disclosure.

In the figure: 10: a light source device; 11: a light source structure; 12: a light guide structure; 121 an optical outcoupling portion; 1211: a first light out-coupling section group; 1212: a second light out-coupling section group; 122: an incident light region; 123: a reflector; 124: a light-guiding medium; 13: a light uniformizing section; 131: a first light uniformizing member; 132: a second light homogenizing member; 133: a first reflective film; 134: a second reflective film; 14: a light splitting structure; 15: a reflective element; 16: a light-condensing section; 17: a polarization conversion structure; 100: a display device: 110: a liquid crystal screen: 120: a light converging element; 130: a diffusion element; 200: a heads-up display system; 210: an imaging window; 220: an eye box region; 230: a virtual image.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than drawing according to the number, shape and size of the components in practical implementation, and the type, amount and proportion of each component in practical implementation may be changed freely, and the layout of the components may be more complicated.

It should be noted that for simplicity and clarity of illustration, the following describes several representative embodiments of the present invention. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "comprising" means "including but not limited to", "according to '8230;' 8230;" means "according to at least '8230;' 8230;, but not limited to only according to '8230;' 8230;". "first," "second," and the like are used merely as references to features and are not intended to impose any limitations, e.g., limitations on the order, of the features. In view of the language convention of chinese, the following description, when it does not specifically refer to the number of a component, means that the component may be one or more, or may be understood as at least one. "at least one" means one or more, "a plurality" means at least two.

In some cases, limited to the limited design space of the vehicle (e.g., vehicle), reducing the space occupied by the HUD is a very important design consideration.

Embodiments of the present disclosure provide a light source device including a light source structure for emitting light, which is a source light, and a light guide structure including a light entrance area allowing at least part of the light to enter the light guide structure and including a plurality of light outcoupling portions at which light incident at each of at least part of the light outcoupling portions is partially reflected and partially outcoupled by the light outcoupling portions; the light guide structure comprises a light homogenizing part which is configured to homogenize light before the light is incident to the light out-coupling part, or a plurality of light out-coupling parts of the light guide structure comprise a plurality of transflective elements for realizing partial reflection and partial out-coupling, or the light guide structure comprises the light homogenizing part and the transflective elements; the orthographic projection of the light source structure on the light guiding structure is at least partially located within the light guiding structure. For example, the orthographic projection of the light source structure to the light guide structure in the direction perpendicular to the arrangement direction of the plurality of light out-coupling portions is mostly located inside the light guide structure, and may also be partially outside the light guide structure; alternatively, the entire orthographic projection of the light source structure is located within the light guide structure.

In an embodiment of the present disclosure, a light guide structure is configured to cause light rays incident thereon to propagate in a first direction and exit the light guide structure in a second direction that intersects the first direction; the light guiding structure may be any type of light guiding structure, which may also be referred to as light guiding structure, waveguide structure or light guiding structure.

In at least one embodiment, the light source device may be used in a display device. For example, embodiments of the present disclosure provide a display device including the light source device and an image generating element configured to generate image light using light emitted from the light source device.

In the embodiment of the present disclosure, the image light obtained after being processed by the image generating element carries image information, and correspondingly, the light emitted by the light source device does not carry image information before being incident on the image generating element for processing, and is therefore referred to as source light.

The embodiment of the disclosure also provides a head-up display system, which comprises the above light source device or display device.

The embodiment of the disclosure also provides a vehicle, which comprises the above light source device or display device or head-up display system.

In the present disclosure, as shown in fig. 1a to 10, in the light coupling-out direction (the second direction), an orthographic projection of the light source structure 11 on the light guide structure 12 is at least partially located in the light guide structure 12, wherein the light coupling-out direction of the light guide structure 12 is a thickness direction of the light source device, and a direction perpendicular to the light coupling-out direction is an extending direction (for example, a width direction or a length direction) of the light source device (the extending direction is an example of the first direction). In the embodiment of the present disclosure, the light source structure 11 is disposed along the thickness direction of the light source device, so that the width of the light source device is effectively reduced, and the structure of the light source device is more compact. In some embodiments, the light source device is particularly suitable for application scenarios with small requirements on the thickness of the light source device and high requirements on the width.

In some embodiments of the present disclosure, as shown in fig. 1a to 10, the light guiding structure 12 may include one or more light incident regions, and the light incident region of the light guiding structure 12 may correspond to a middle or end region of the light guiding structure 12.

For example, as shown in fig. 1a-1b, 2b-2d, light-entry region 122 included in light guiding structure 12 corresponds to the middle of light guiding structure 12, whereby light enters light guiding structure 12 from the middle of light guiding structure 12 and propagates in light guiding structure 12 from the middle of light guiding structure 12 to two opposite end regions of light guiding structure 12.

In other embodiments, the light entry region 122 may be located at an end region of the light guiding structure 12. For example, as shown in fig. 2a, the light guiding structure 12 comprises two light entrance areas 122, which correspond to two opposite end areas of the light guiding structure 12, respectively, whereby light enters the light guiding structure 12 from the two opposite end areas of the light guiding structure 12, respectively, and propagates in the light guiding structure 12 from the end areas towards the middle part of the light guiding structure 12. In other examples, as shown in fig. 3a-3b, 5a-10, the light guiding structure 12 includes one light entry region corresponding to one end region, whereby light enters the light guiding structure 12 from one end region of the light guiding structure 12 and propagates in the light guiding structure 12 towards another end region of the light guiding structure 12 opposite the end region.

In some embodiments, the light guide structure 12 may comprise one or more light out-coupling groups, each light out-coupling group comprising at least two light out-couplings arranged in sequence. For example, the at least two light outcoupling portions are arranged in order in the first direction. For example, the at least two light outcoupling portion groups are sequentially arranged in a direction perpendicular to the light outcoupling direction.

In some embodiments, as shown in fig. 3a-3b, 5a-10, the plurality of light out-couplers 121 of the light guide structure 12 comprises one light out-coupler group. Alternatively, in other embodiments, as shown in fig. 1a, fig. 1b, and fig. 2a to 2d, the plurality of light out-coupling portions 121 of the light guide structure 12 include a first light out-coupling portion group 1211 and a second light out-coupling portion group 1212 that are sequentially arranged in an arrangement direction of the plurality of light out-coupling portions, the first light out-coupling portion group 1211 includes a plurality of first light out-coupling portions, and the second light out-coupling portion group 1212 includes a plurality of second light out-coupling portions; the light entrance region 122 of the light guide structure 12 is located between the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212 in the arrangement direction of the plurality of light out-coupling portions 121, and light entering the light guide structure 12 from the light entrance region 122 of the light guide structure 12 is coupled out by the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212.

For example, the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212 are arranged in sequence in a direction perpendicular to the light out-coupling direction (the horizontal direction is taken as an example in the figure), the light incident to the plurality of first light out-coupling portions and the light incident to the plurality of second light out-coupling portions propagate in the light guide structure 12 in opposite directions, and the light out-coupled by the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212 is coupled out toward the same side of the light guide structure 12, which is the light out-coupling side of the light guide structure 12, for example. For example, as shown in fig. 1a-1b, 2b-2d, the light guiding structure 12 includes a light incident region 122 corresponding to a middle portion of the light guiding structure 12. For example, the light-in region 122 corresponds to the middle of the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212, the transmission distances of the light rays entering the light guide structure 12 in the first light out-coupling portion group 1211 and the second light out-coupling portion group 1212 are the same or tend to be the same, and the propagation directions in the light guide structure 12 are opposite.

In some embodiments, where the light guide structure 12 includes the first and second light out- coupling portions 1211, 1212, the light guide structure 12 may include one light in-entering region 122 located in the middle (as illustrated in fig. 1a, 1b, 2b-2 d), or may include two light in-entering regions located at end regions of the light guide structure 12. For example, as shown in fig. 2a, the light guiding structure 12 comprises two light in-light regions 122 located at a side of the first and second light out- coupling portions 1211 and 1212, respectively, away from the middle portion of the light guiding structure 12, whereby light rays enter the light guiding structure 12 from two opposite end regions of the light guiding structure 12, respectively, and propagate from the end regions towards the middle portion of the light guiding structure 12 and are out-coupled by the first and second light out- coupling portions 1211 and 1212, respectively.

For example, the light exiting region of the first light out-coupling portion 1211 is adjacent to the light exiting region 122 of the second light out-coupling portion group, and is disposed without a gap, in this way, the light exiting from the light guide structure 12 is continuous and/or the uniformity of the light exiting is improved. For example, as shown in fig. 1a to 1b and 2b to 2d, the end portions of the first light out-coupling portion in the first light out-coupling portion group 1211, which receives light, and the end portions of the second light out-coupling portion in the second light out-coupling portion group 1212, which are close to each other, are connected to each other (e.g., abutted or attached to each other), so that continuous light emission can be achieved, and a situation that a bright bar is displayed due to light not being directly emitted through the light out-coupling portion group can be avoided in some cases. In at least another example, as shown in fig. 2a, the ends of the last first light out-coupling portion in the first light out-coupling portion group 1211, which receives light, and the last second light out-coupling portion in the second light out-coupling portion group 1212, which receives light, which are close to each other, are connected to each other (e.g., abutted or clinging), which may achieve continuous light extraction, and in some cases, to avoid the light extraction region of the light guide structure from including dark regions.

In some embodiments, the plurality of light out-coupling portions in the light guiding structure 12 may comprise a plurality of transflective elements or a plurality of light out-coupling gratings or other types of means for coupling out light from the light guiding structure 12. For ease of understanding, the following embodiments are described taking as an example that the light outcoupling portion includes a transflective element.

For example, at least some of the transflector elements partially transmit and partially reflect light incident thereon, such that a portion of the light rays incident thereon are coupled out of the light guiding structure 12 and another portion continue to propagate in the light guiding structure 12. Fig. 1a to 10 illustrate examples of transflective elements reflecting light incident thereon out of the light guide structure 12; in other examples, the transflector element may couple light incident thereon out of the light guide structure 12 by way of transmission.

In some embodiments, as shown in fig. 1a to 10, the light guiding structure 12 comprises a plurality of transflective elements that may be tilted with respect to their alignment direction (exemplified by the horizontal direction in the figures). Alternatively, in other embodiments, each of the plurality of transflective elements included in light guiding structure 12 may also be disposed along the alignment direction of the plurality of transflective elements.

For example, at least part of the transflector element may comprise a conditioning medium for conditioning the reflectivity and/or transmissivity of the transflector element. For example, the types of conditioning media correspond one-to-one to the transflective elements, in which case, for example, different types of conditioning media are provided for different transflective elements; alternatively, the number of types of conditioning media is smaller than the number of transflective elements, in which case, for example, at least two transflective elements comprise the same type of conditioning media. For example, the light-receiving surfaces of at least two transflective elements are occupied by the conditioning media and include a margin region where no conditioning media is disposed. For example, the conditioning medium may be a single-layer film structure or a stacked structure of multiple films.

In some embodiments, such as the embodiments shown in fig. 1 a-3b, 5a-10, the transflective elements in the light guiding structure 12 may be disposed directly in a gaseous (e.g., air) environment; alternatively, the light guiding structure 12 may include a light guiding medium 124, and the transflective elements in the light guiding structure 124 may be located in the light guiding medium 124.

For example, the material of the light guide medium 124 includes a transparent optical material having a refractive index greater than 1. For example, the transparent optical material may include at least one or more of Silicon dioxide, lithium niobate, silicon-on-insulator (SOI), high molecular polymer, group iii-v semiconductor compound, glass, and the like. For example, the light guide medium may be shaped as a planar substrate, a stripe-shaped substrate, a ridge-shaped substrate, or the like.

For example, light rays in light guiding structure 12 propagate linearly or reflectively in light guiding medium 124, for example, along the direction of the arrangement of the plurality of transflective elements. For example, the reflective propagation may include total reflection propagation and/or non-total reflection propagation. For example, the light may be totally reflected at least one of the opposing major surfaces of the light guiding medium 124.

For example, the transflective element may be disposed in the light guiding medium in a plated or pasted manner. For example, a plurality of sub light guide media may be employed, each of at least some of the sub light guide media being a cylinder having a parallelogram in cross section, adjacent sub light guide media being spliced together and a transflective element being disposed between the spliced sub light guide media. The transflector element may also be arranged in the light guiding medium in other ways.

For example, the transflector element may be a substantially wavelength-and polarization-selective-free element, and the light emitted by the light source has substantially unchanged wavelength and polarization properties after being transmitted/reflected by the transflector element.

For example, the reflectivity of the plurality of transflective elements in the light guiding structure 12 gradually increases along the arrangement direction of the plurality of transflective elements. This is advantageous for achieving a uniform light exit from the light guiding structure 12.

In some embodiments, as shown in fig. 3a-3b, 5a-10, the plurality of light out-couplers 121 of the light guide structure 12 may comprise a plurality of transflective elements having the same direction of tilt, the plurality of transflective elements belonging to the same group of light out-couplers. Alternatively, in some other embodiments, as shown in fig. 1a, 1b, and 2a-2d, the first light out-coupling portion group 1211 includes a plurality of first transflective elements, and the second light out-coupling portion group 1212 includes a plurality of second transflective elements, where the plurality of first transflective elements are opposite to the inclination direction of the plurality of second transflective elements with respect to the arrangement direction (the horizontal direction is taken as an example in the figure) of the plurality of light out-coupling portions 121 included in the light guide structure 12.

For example, the first transflective element and the second transflective element are disposed along a first oblique direction and a second oblique direction, respectively, having a set angle therebetween, such as an angle of approximately 90 ° or an obtuse angle. "substantially" may be understood as ignoring the effects of process errors and the like.

In some embodiments, as shown in fig. 1 a-2d, the first and second transflective elements are inclined in opposite directions and at substantially the same angle relative to the direction of the arrangement of the transflective elements. For example, a plurality of first transflective elements in the first light out-coupling group 1211 and a plurality of second transflective elements in the second light out-coupling group are arranged in mirror image. For example, the first transflective element and the second transflective element are arranged symmetrically around a plane of a main optical axis of the light source structure.

In some embodiments, as shown in fig. 1a to 3b and 5a to 10, the light in the light source structure 11 can be emitted through one light source portion (as shown in fig. 1a, 2b, 2c and 3a to 10) or multiple light source portions (as shown in fig. 1b, 2a and 2 d); and/or, the light emitted by the light source structure 11 may be divided into one or more portions; such light may satisfy one or more light-in regions of the light guide structure 12, or satisfy the use of one or more sets of light outcoupling portions, or for polarization conversion of light.

For example, as shown in fig. 1a, 2b, 2c, and 3a to 10, the light source structure 11 includes a first light source portion configured to emit a first source light, and a first portion of the first source light is located in an optical path of at least one first light out-coupling portion of the first light out-coupling portion group 1211, and a second portion of the first source light is located in an optical path of at least one second light out-coupling portion of the second light out-coupling portion group 1212.

For example, as shown in fig. 1a, 2b, 2c, and 3a to 10, the first light source part shown in the drawings may include one sub-light source; alternatively, the first light source part may include a plurality of sub-light sources, for example, having an arrangement direction perpendicular to the light out-coupling direction or perpendicular to the arrangement direction of the plurality of transflective elements. For example, the first light source part includes one sub-light source for emitting the first source light, and the first source light includes two display regions that can emit the first and second portions of the first source light, respectively; or, for example, the first light source part includes a plurality of sub-light sources, the plurality of sub-light sources may be connected to the same circuit or may be independently disposed, a part of the sub-light sources is used for emitting a first portion of the first source light, and another part of the sub-light sources is used for emitting a second portion of the first source light.

For example, as shown in fig. 1b, fig. 2a and fig. 2d, the light source structure 11 includes a first light source portion and a second light source portion configured to emit a first source light and a second source light, respectively, of the source light, the first source light emitted by the first light source portion is at least located in the optical path of the at least one first light out-coupling portion of the first light out-coupling portion group 1211, and the second source light emitted by the second light source portion is at least located in the optical path of the at least one second light out-coupling portion of the second light out-coupling portion group 1212.

For example, as shown in fig. 1b, 2a and 2d, the first light source portion and the second light source portion respectively include one sub light source, or the first light source portion and the second light source portion respectively include a plurality of sub light sources, for example, an arrangement direction of the plurality of sub light sources is perpendicular to a light outcoupling direction or to an arrangement direction of the plurality of transflective elements, and the first light source portion and the second light source portion emit the first source light and the second source light using one or more sub light sources.

In some embodiments, as shown in fig. 1a to 3b, and 5a to 10, source light emitted by one or more light source portions of the light source structure 11, or a portion or portions of the source light, may be emitted to one or more light out-coupling portion sets.

For example, as shown in fig. 1b, 2a and 2d, the light source structure 11 comprises a first light source part and a second light source part configured to emit a first source light ray and a second source light ray of the source light rays, respectively, the first source light ray being emitted to the first set of light out-coupling parts 1211, the second source light ray being emitted to the second set of light out-coupling parts 1212; alternatively, for example, as shown in fig. 1a, 2b and 2c, the light source structure 11 includes a first light source portion configured to emit a first source light, the first source light being emitted to the first and second light out- coupling portion groups 1211 and 1212 simultaneously; alternatively, for example, as shown in fig. 3a to 10, the light source structure 11 includes a first light source section configured to emit a first source light, which is emitted to one light outcoupling section group.

For example, the first light source part and the second light source part may be one or more of a laser light source, an LED light source, and the like.

In some embodiments, as shown in fig. 2 a-3b, fig. 5 a-6, and fig. 8-10, the light source device includes a light recycling device, and the light recycling device is used to recycle part of the unusable light in the source light, so as to make the light fully utilized.

For example, as shown in fig. 4a to 4d, the light recycling device includes a light splitting structure 14 and a polarization conversion structure 17. The light splitting structure splits the source light rays into at least two polarization states, and the polarization conversion structure converts at least part of the polarization states of the light rays which cannot be utilized by the display panel into the polarization states which can be utilized.

For example, as shown in fig. 4a-4d, the light splitting structure 14 is configured to split the light incident to the light splitting structure 14 into a first light having a first polarization characteristic and a second light having a second polarization characteristic; the first light is incident to the polarization conversion structure to be subjected to polarization conversion processing to obtain a third light, and the third light is polarized light with a second polarization characteristic. The first light is converted into a third light having a second polarization characteristic, and the third light has the same polarization characteristic as the second light. For example, the light with the second polarization characteristic can be utilized, and the first light can be recycled by converting the first light into the third light with the second polarization characteristic. The third light ray is: a light ray having the same polarization characteristics as the second light ray but at least one intermediate polarization characteristic during conversion.

For example, one of the first polarization characteristic and the second polarization characteristic is an S-polarization characteristic and the other is a P-polarization characteristic.

In some embodiments, the first light is subjected to at least one polarization conversion process to obtain a third light. For example, the first light undergoes a polarization conversion to be converted into a third light having a second polarization characteristic; alternatively, the first light is converted into the third light having the second polarization characteristic by performing polarization conversion twice, or the light is converted into the third light having the second polarization characteristic by performing polarization conversion a greater number of times. For example, the polarization converting structures may differ in their properties when one or more polarization conversions take place, e.g., the polarization converting structures are at least one or more of 1/2 wave plates or 1/4 wave plates, etc.

In some embodiments, such as fig. 2 a-3b, 5 a-6, 8-10, the light splitting structure splits the light into at least two different polarization specific light rays. For example, the beam splitting structure splits the light into S-polarized light and P-polarized light. The light path directions of the light rays with at least two polarization characteristics are different, wherein the polarization conversion structure can be arranged on at least one light path and is used for carrying out polarization state conversion on the light rays on the light path.

For example, the light splitting structure is a Polarization Beam Splitter (PBS), and the polarization beam splitter is configured to split the light into a first light and a second light with different polarization states, and the transmittance of the polarization beam splitter for the first light is greater than that for the second light, or the reflectance of the polarization beam splitter for the first light is less than that for the second light, or a combination of the transmittance and reflectance relationships.

For example, the polarization conversion structure 17 includes a phase retardation element by which the polarization characteristics of light are changed; for example, the phase retardation element is a 1/2 wave plate or a 1/4 wave plate.

For example, the polarization conversion structure further includes a reflective element 15, and the reflective element 15 changes the propagation direction of at least one of the light rays so that the plurality of light rays separated by the light splitting structure have the same direction or can be directed to a specific position.

In some embodiments, as shown in fig. 2a to 3b, fig. 5a to 6, and fig. 8 to 10, by combining the positions of the Polarization Beam Splitter (PBS), the polarization conversion structure 17, and the reflection element, a plurality of light splitting and polarization conversion methods can be obtained, and these light splitting and polarization conversion methods can be used for light splitting and polarization conversion.

In order to make the drawings simpler, the polarization conversion structure 17 is not shown in some of fig. 2 a-3b, 5 a-6, 8-10, and some of the drawings only show one arrangement of the polarization conversion structure 17; however, the relationship between the light splitting structure and the polarization conversion structure in the embodiments shown in fig. 2a to 3b, fig. 5a to 6, and fig. 8 to 10 may adopt any one of fig. 4a to 4 d.

For example, as shown in fig. 4a, the polarization converting structure 17 is disposed on a side of the polarization beam splitting element away from the reflecting element 15. The light source emits unpolarized light, for example, the liquid crystal panel 110 may utilize S-polarized light, and the transflective element reflects S-polarized light and transmits P-polarized light, and the polarization beam splitter element reflects S-polarized light. The S-polarized light in the light emitted from the light source is reflected by the polarization beam splitting element, the reflected S-polarized light is reflected by the reflecting element 15 and then emitted to the light guide structure 12, the P-polarized light in the light emitted from the light source is transmitted by the polarization beam splitting element, and after being transmitted, the P-polarized light is converted into S-polarized light by the polarization conversion structure 17 and then emitted to the light guide structure 12, so that the non-polarized light emitted from the light source is converted into S-polarized light usable by the liquid crystal panel 110.

For example, the polarization beam splitter can be a transflective film with the characteristics of reflecting S-polarization state and transmitting P-polarization state light, which is plated or coated on the substrate. For example, the transflective film is one or more of a DBEF optical film, a BEF optical film, and the like.

For example, the reflecting member 15 may be a common reflecting plate; alternatively, a reflective film having a characteristic of reflecting S-polarized light may be plated or attached on the substrate. For example, the reflecting plate is one or more of a metal reflecting plate, a glass reflecting plate and the like; for example, the reflective film is any reflective film that reflects S-polarized light.

The polarization conversion structure 17 is, for example, a 1/2 wave plate.

For example, the reflecting element 15 may have transflective properties, which may be the same as those of the polarization beam splitter element.

For example, the polarization conversion structure 17 is attached to the polarization beam splitter. For example, the interpretation of the fit setting may be as follows: the attaching surface of the polarization conversion structure 17 is arranged on the surface of the polarization beam splitting element, and there is substantially no gap between the two. For example, the polarization conversion structure 17 may be attached to the polarization beam splitter by a connection method such as adhesion, adsorption, or adhesion. For example, the polarization conversion structure 17 may be attached and fixed to the surface of the polarization beam splitting element.

For example, as shown in the polarization conversion structure of fig. 4a, if the liquid crystal panel 110 can utilize the light in the P-polarization state, the polarization beam splitter component reflects the light in the P-polarization state and transmits the light in the S-polarization state, the reflection component 15 can reflect the light in the P-polarization state, the polarization conversion structure 17 is a 1/2 wave plate, and the polarization conversion and the light path direction conversion methods thereof are the same as the methods of the liquid crystal panel 110 can utilize the light in the P-polarization state, and thus, the description thereof is omitted.

For example, as shown in fig. 4b, the polarization conversion structure 17 is disposed on the exit path of the light reflected by the reflective element 15. The light source emits unpolarized light, the lcd panel 110 can utilize S-polarized light, and the polarization beam splitter transmits S-polarized light and reflects P-polarized light, and the reflector 15 can reflect P-polarized light. The S-polarized light in the light emitted from the light source is transmitted through the polarization beam splitting element, the reflected P-polarized light is reflected by the reflecting element 15, and the reflected P-polarized light is converted into S-polarized light after being processed by the polarization converting structure 17, so that the non-polarized light emitted from the light source can be converted into S-polarized light usable by the lcd 110. The performance, material and other parameters of each element in the polarization conversion device shown in fig. 4b are the same as those of each element in the polarization conversion device shown in fig. 4a, and thus the description thereof is omitted.

For example, as shown in fig. 4c, a polarization converting structure 17 is arranged between the transflective element and the reflective element 15. The light source emits unpolarized light, the liquid crystal panel 110 can use S-polarized light, the polarization beam splitter element transmits S-polarized light and reflects P-polarized light, and the reflection element 15 can reflect S-polarized light. The S-polarized light in the light emitted from the light source is transmitted by the polarization beam splitting element, the reflected P-polarized light is processed by the polarization conversion structure 17 and converted into S-polarized light, and then reflected by the reflection element 15, so that the non-polarized light emitted from the light source can be converted into S-polarized light usable by the liquid crystal panel 110. The performance, the material and other parameters of each element in the polarization conversion device shown in fig. 4c are the same as those of each element in the polarization conversion device shown in fig. 4a, and thus the description thereof is omitted.

For example, as shown in fig. 4d, the polarization conversion structure 17 is disposed on a side of the reflective element 15 close to the transflective element, the light source emits unpolarized light, the liquid crystal panel 110 can utilize S-polarized light, the polarization beam splitter reflects P-polarized light and transmits S-polarized light, and the reflective element 15 is a common reflective element 15, such as an aluminum mirror, which has no polarization reflection characteristic. The S polarization part of the light emitted by the light source is transmitted by the polarization beam splitting element, and the transmitted S polarization light is emitted to the liquid crystal screen 110; the P-polarization part of the light emitted from the light source is reflected by the polarization beam splitting element, and is converted into circularly polarized light after being processed by the polarization conversion structure 17 after being reflected, the circularly polarized light is reflected on the reflecting element 15, and the reflected circularly polarized light is converted into S-polarization light by the polarization conversion structure 17 again, so that all the non-polarization light emitted from the light source can be converted into S-polarization light available for the liquid crystal panel 110. In the embodiment of fig. 4d, the light passes through the polarization conversion structure 17 twice, so that the polarization conversion structure 17 is a 1/4 wave plate, and the performance, the material, and other parameters of other elements in the polarization conversion device are the same as those of the elements in the polarization conversion device shown in fig. 4a, and are not repeated herein.

In some embodiments, as shown in fig. 2a to 3b, fig. 5a to 6, and fig. 8 to 10, after being split by the light splitting structure, at least two light beams are obtained, and the at least two light beams may enter different light out-coupling portion groups respectively, or the same light out-coupling portion group is performed, and the light beams can be recycled by using one of the two methods. For example, as shown in fig. 2b and 2c, light emitted from a light source structure is divided into a first light and a second light, the first light corresponds to the first light out-coupling portion 1211, and the second light corresponds to the second light out-coupling portion 1212, as shown in fig. 2b, the polarization conversion structure converts the first light before entering the first light out-coupling portion 1211 into a third light, or, as shown in fig. 2c, the polarization conversion structure converts the first light out-coupled by the first light out-coupling portion 1211 into a third light. The set of light-corresponding light outcoupling portions is explained as follows: after entering the light guide structure 12, the light is coupled out from the light out-coupling portions in corresponding relation thereto.

For example, as shown in fig. 2a and 2d, a first light source portion and a second light source portion of the light source structure respectively emit a first source light and a second source light, both the first source light and the second source light are divided into a first light and a second light, a third light obtained by converting the first light of the first source light by the polarization conversion structure and the second light of the first source light propagate to the first light out-coupling portion group 1211, and a third light obtained by converting the first light of the second source light by the polarization conversion structure and the second light of the second source light propagate to the second light out-coupling portion group 1212.

For example, as shown in fig. 5a to 6 and 8 to 10, light emitted from one light source structure is divided into a first light and a second light. The first light or the second light is converted by polarization, for example, the first polarization of the first light is converted into the same polarization as the second light, and the first light and the second light converted by deflection enter one light out-coupling portion group.

In some embodiments, as shown in fig. 2 a-3b, 5 a-6, and 8-10, the positions of the light splitting structure and the polarization conversion structure in the light path are not limited, and can be disposed at multiple positions in the light path; for example, the light splitting structure and the polarization conversion structure are arranged between the light source part and the light guide structure, and source light rays emitted by the light source enter the structure behind the light path after being split and polarization converted; and the source light is processed by the light splitting structure and the polarization conversion structure and then still propagates along the set light-emitting direction.

In some embodiments, the light splitting structure and the polarization conversion structure may be disposed continuously or discontinuously, and the continuous arrangement is: after being split, the source light is subjected to polarization conversion, and the non-continuous arrangement is as follows: the source light is split and then enters the light guide structure for polarization conversion.

For example, as shown in fig. 2a, fig. 2b, fig. 2d, fig. 3a, fig. 3b, fig. 5 a-fig. 6, and fig. 8-fig. 10, the light emitted from the light source structure is processed by the light splitting structure to perform polarization conversion on the first light, and it should be noted that, in the above-mentioned figures, the polarization conversion structure 17 is not shown, and the polarization conversion structure 17 is disposed on the optical path of the first light after the light splitting structure and is used for converting the first light into a third light. For example, as shown in fig. 2c, the polarization conversion structure 17 is disposed on the optical path of the first light ray after being coupled out, and is used for converting the coupled-out first light ray into a third light ray, and the polarization conversion structure 17 may be attached to the light guide structure, or may be disposed in a non-attached manner.

In some embodiments, as shown in fig. 2a and 2d, the light splitting structure includes at least one light splitting element (e.g., a polarizing beam splitting element PBS), and the first source light and the second source light are split by the same light splitting element or different light splitting elements; and/or the polarization conversion structure includes at least one polarization conversion element (e.g., a phase retardation element), and the first light of the first source light and the first light of the second source light are polarization-converted by the same polarization conversion element or different polarization conversion elements.

For example, as shown in fig. 2a, the first source light and the second source light correspond to the light splitting structure 14 and the polarization conversion structure, respectively; for example, as shown in fig. 2d, the first source light and the second source light respectively correspond to the light splitting structure 14, the first light or the second light split by the light splitting structure 14 is reflected by the same reflective element, and the reflected first light or the reflected second light is polarization-converted by the same polarization conversion structure 17.

In some embodiments, as shown in fig. 2a-2c, 3a, 3b, 5a-10, the light source device includes a light homogenizing unit disposed on the light path for homogenizing the light. Before the light enters the light guide structure, the light is reflected/totally reflected for multiple times in the light uniformizing part, so that the uniformity of the light can be improved, and particularly, the light and shade of the light can be improved.

For example, as shown in fig. 2a-2c, the source light emitted from the light source structure, or the split light, or the split and polarization-converted light, is homogenized by at least one homogenizing part 13 and then enters the light guide structure 12.

In some embodiments, as shown in fig. 2a to 2c, 3a, 3b, and 5a to 10, the light uniformizing section and the plurality of light outcoupling sections are disposed in a stacked manner in a direction perpendicular to an arrangement direction of the plurality of light outcoupling sections or are disposed in sequence in the arrangement direction of the plurality of light outcoupling sections.

For example, as shown in fig. 2a to 2c, the dodging portion 13 and the plurality of light outcoupling portions are stacked in a direction perpendicular to an arrangement direction of the plurality of light outcoupling portions.

For example, as shown in fig. 3a, 6 to 10, the light unifying unit 13 includes one first light unifying member 131, and the first light unifying member 131 and the plurality of light out-coupling units are stacked in a direction perpendicular to the arrangement direction of the plurality of light out-coupling units. As shown in the perspective view of the figure, the first light homogenizing member 131 is stacked below the light guide structure 12, and the light emitting side of the first light homogenizing member 131 emits homogenized light, which enters the light guide structure 12 through the light entering region 122 of the light guide structure.

For example, as shown in fig. 3b, the first light uniformizer 131 and the plurality of light out-coupling portions are sequentially arranged in the arrangement direction of the plurality of light out-coupling portions. As shown in the view angle of the figure, the first light uniformizing elements 131 are arranged side by side on one side of the light guide structure 12, and the light emitting side of the first light uniformizing elements 131 emits homogenized light, which enters the light guide structure 12 through the light incident region 122 at the side end of the light guide structure.

In some embodiments, the light homogenizing part comprises a plurality of first light homogenizing elements, and the arrangement of the plurality of first light homogenizing elements can refer to the arrangement of one first light homogenizing element. For example, a plurality of first smoothing members 131 may be arranged in a stack as shown in fig. 3a, or arranged side by side as shown in fig. 3b, or may be arranged in a stack with the first smoothing members 131 shown in fig. 3 b.

In some embodiments, when the light unifying part includes a plurality of first light unifying members, the light needs to propagate in as many first light unifying members as possible, so that the number of times of reflection/total reflection occurs is more, and the homogenization effect is maximized.

For example, the ends of the first light uniforming members 131 are spaced apart from or integrally connected to the head of the next first light uniforming member 131, and the light can be reflected by a reflecting structure independently or integrally connected to the first light uniforming members 131, so that the light can enter the next first light uniforming member 131 from one first light uniforming member 131.

In some embodiments, as shown in fig. 3a to 3b, fig. 5a to 6, and fig. 8 to 10, the light out-coupling parts of the light guide structure include a light out-coupling part group, the light out-coupling parts of the light out-coupling part group are arranged in the same direction, the light guide structure of the structure is provided with a light-in region, and light can be transmitted in one direction in the light guide structure.

For example, as shown in fig. 3a-3b, fig. 5 a-6, and fig. 8-10, the light incident region is located at the edge of the light incident side of the light guide structure, and light propagates from one edge to the opposite edge within the light guide structure.

In some embodiments, as shown in fig. 3a to 3b, fig. 5a to 6, and fig. 8 to 10, a light splitting structure and a polarization conversion structure are disposed on the light path, and the light splitting structure 14 and the polarization conversion structure are the same as the light splitting structure 14 and the polarization structure shown in fig. 4a to 4d, and the light splitting and polarization conversion modes. After the light is split and converted in polarization, partial light recovery can be realized, and the light utilization rate is further improved.

For example, as shown in fig. 3a-3b, fig. 5 a-6, and fig. 8-10, the light splitting structure 14 is configured to split the light incident to the light splitting structure 14 into a first light and a second light, the first light being polarized light having a first polarization characteristic, and the second light being polarized light having a second polarization characteristic; the polarization conversion structure is configured to change the polarization characteristic of the first light ray, so that the first light ray with the first polarization characteristic is converted into a third light ray which has a second polarization characteristic and is polarized after at least one polarization conversion treatment of the polarization conversion structure; the light splitting structure 14 and the polarization conversion structure are disposed on the light incident side or the light emitting side of the first light uniformizing element 131, and the first light is converted by the polarization conversion structure and then propagates to at least part of the plurality of light outcoupling portions.

In some embodiments, as shown in fig. 3a-3b, fig. 5 a-6, and fig. 8-10, the light source device at least includes a first light-homogenizing member 131, and the light-splitting structure is disposed at least on the light-incident side of the first light-homogenizing member 131 to homogenize the separated first light and second light.

In some embodiments, as shown in fig. 5a-5c, the homogenizing section may comprise a second homogenizing member 132, the number of the second homogenizing member 132 being one or more, the second homogenizing member 132 being located between the first homogenizing member 131 and the light guiding structure 12 in the light path, the light emitted by the first homogenizing member 131 entering the second homogenizing member 132, being homogenized by the second homogenizing member 132 and then entering the light guiding structure 12.

For example, as shown in fig. 5a to 5c, the light uniformizing part 13 includes a first light uniformizing member 131 and a second light uniformizing member 132, and the light is homogenized by the first light uniformizing member 131 and the second light uniformizing member 132 in sequence and then enters the light guiding structure 12.

In some embodiments, as shown in fig. 5a-5c, the light splitting structure and the light conversion structure are disposed on the light emitting side of the first light homogenizing element 131, and the light emitted from the first light homogenizing element 131 is homogenized by at least one second light homogenizing element 132.

For example, as shown in fig. 5a to 5c, at least the light splitting structure is disposed between the first and second light uniforming members 131 and 132. For example, the light splitting structure and the polarization conversion structure are disposed between the first light uniformizer 131 and the second light uniformizer 132. As shown in fig. 5a to 5c, the light homogenized by the first light homogenizing member 131 is divided into a first light and a second light by the light splitting structure 14, and the second light and a third light obtained by converting the first light by the polarization conversion structure are homogenized by the second light homogenizing member 132 and then propagate to the side of the light coupling-out portion of the light guide structure 12.

For example, the reflecting member 123 is disposed on the light exit side of the second light uniformizing element 132, and the light emitted from the second light uniformizing element 132 is reflected by the reflecting member to the side of the light guide structure 12 where the plurality of light out-coupling portions are located.

In other embodiments, the positions of the light splitting structure and the light converting structure in fig. 5a-5c may be replaced by positions at the light entrance side of the first light uniformizer 131.

The inventor of the present application has found that, in the light split and polarization-converted by the light splitting device, before entering the light guide structure, the light split and polarization-converted by the light splitting device is homogenized by at least one light homogenizing device, so as to improve the blue-yellow polarization of the polymer film such as the Polarization Beam Splitter (PBS) and the wave plate.

In some embodiments, as shown in fig. 5a to 5c, the second light uniformizing element 132 and the plurality of light outcoupling portions are stacked in a direction perpendicular to the arrangement direction of the plurality of light outcoupling portions or are sequentially arranged in the arrangement direction of the plurality of light outcoupling portions.

For example, as shown in fig. 5a and 5b, the second light homogenizer 132 and the plurality of light out-coupling portions are stacked in a direction perpendicular to the arrangement direction of the plurality of light out-coupling portions, and the second light homogenizer 132 and the first light homogenizer 131 are also stacked.

For example, as shown in fig. 5c, the second light uniformizer 132 and the plurality of light outcoupling portions may be provided in this order in the arrangement direction of the plurality of light outcoupling portions, and the second light uniformizer 132 may be provided in a stack with the first light uniformizer 131.

For example, the arrangement of the second light uniformizing elements 132 is not limited to the above two arrangements, and other arrangements may be adopted. For example, the second light homogenizing element 132 is arranged obliquely or perpendicularly with respect to the first light homogenizing element 131 and the light guiding structure 12, which is particularly suitable for the case of low requirements on the thickness of the light source device.

In some embodiments, the number of the second light uniformizing elements is plural, and the plural second light uniformizing elements may be stacked in a direction perpendicular to the arrangement direction of the plural light outcoupling portions, or may be arranged in sequence in the arrangement direction of the plural light outcoupling portions, or a combination thereof.

For example, a plurality of second light uniforming members are stacked, the end of one second light uniforming member is spaced apart from or integrally connected to the end of the next second light uniforming member, and the light can be reflected by the reflecting structure independently or integrally connected to the second light uniforming member, so that the light can enter the next second light uniforming member 132 from one second light uniforming member.

In some embodiments, the shims as shown in fig. 2a-2c, or the first shim as shown in fig. 3a, 3b, and 6-10, and the first and second shims as shown in fig. 5a-5c, are collectively referred to hereinafter as a shim. The light homogenizing piece has a set length along the light propagation direction, after the light enters the light homogenizing piece, the light is reflected for multiple times or totally reflected within the set length, and the direction of the light is continuously changed, so that the light tends to be uniform. The light homogenizing element can be a hollow structure, or can be a solid structure, or can be a structure capable of realizing light transmission.

For example, as shown in fig. 2a to 2c, fig. 3a, fig. 3b, fig. 5a to 5c, and fig. 6 to 10, the light uniformizing member includes a first reflective film 133 and a second reflective film 134 which are disposed at an interval, and after entering the light uniformizing member, the light enters the first reflective film 133 or the second reflective film 134, and after propagating for a certain distance, the light reflected by the first reflective film 133 or the second reflective film 134 enters the second reflective film 134 or the first reflective film 133, and the light is reflected/totally reflected and propagated in the first light uniformizing member and the second light uniformizing member in this manner, so that the light uniformizing can be realized.

For example, as shown in fig. 2a to 2c, fig. 3a, fig. 3b, fig. 5a to 5c, and fig. 6 to 10, a light transmission space is formed between the first reflective film 133 and the second reflective film 134. For example, the medium in the light transmitting space is air, or, for example, an optical filling layer is between the first reflective film 133 and the second reflective film 134, and light travels in the optical filling layer; for example, the material of the optical filling layer is one or more of transparent glass, transparent plastic and the like.

For example, the light unifying member 131 includes a transparent optical medium in which the light propagates. For example, the transparent optical medium is a transparent substrate having a refractive index greater than 1.

In some embodiments, the smoothing member is as shown in fig. 2a to 2c, or the first smoothing member is as shown in fig. 3a, 3b and 6-10, and the first and second smoothing members are as shown in fig. 5a-5 c. The reflection/total reflection frequency of the light in the light homogenizing member can be adjusted by changing the inclination of the reflection surface of the light homogenizing member and/or setting the divergence angle of the light, so as to adjust the homogenizing effect of the light.

For example, as shown in fig. 5a, the first reflection film 133 and the second reflection film 134 in the first light uniformizer 131 are obliquely arranged, and the transmission space of the first light uniformizer 131 gradually increases along the light propagation direction; for example, as shown in fig. 2a-2c, 3a, 3b, 5c, and 6-10, the first reflective film 133 and the second reflective film 134 of the light homogenizer are disposed in parallel, and the transmission space of the first light homogenizer 131 remains unchanged along the light propagation direction.

In some embodiments, the light is set to have a non-zero predetermined divergence angle, and when the source light with a certain divergence angle propagates in the light uniforming member, the uniformity (especially, the brightness uniformity) of the light is increased along with multiple reflections/total reflections, thereby improving the uniformity of the backlight.

For example, the predetermined divergence angle range is (0, 20), and/or the predetermined divergence angle is greater than or equal to a non-zero angle between opposing major reflective surfaces (e.g., the first reflective film 133 and the second reflective film 134) of the light homogenizing element at least one of the entrance side, the exit side, and the middle side of the light homogenizing element, or the opposing major reflective surfaces of the light homogenizing element are parallel.

In some embodiments, as shown in fig. 2a to 2c, fig. 3a, fig. 3b, fig. 5a to 5c, and fig. 6 to 10, the light entering the light guide structure is condensed, and the light emitted from the light source or the light homogenizing element is condensed and then enters the light guide structure. Through carrying out spotlight processing to this part light, the waste of dispersing of reducible light improves the utilization ratio of light.

For example, the light-condensing portion is provided in the light-entrance region of the light guide structure; for example, the light-concentrating portions may be connected to the light guide structure or the light uniformizing structure, or may be provided independently. For example, as shown in fig. 6, the light emitted from the light exit side of the first light homogenizer 131 is condensed by the condensing unit 16 and then propagates to the plurality of light outcoupling units of the light guide structure 12.

For example, the light condensing unit 16 may be a single lens, or a lens group in which a plurality of lenses are stacked in the optical path direction, and the light is condensed by the lens or the lens group.

For example, at least one of the lenses or the lens group is an eccentric lens, a focal point of the eccentric lens is located on one side of a center line of the eccentric lens close to the center of the light guide structure 12, and the eccentric lens can deflect light rays towards the direction close to the light guide structure 12, so that more light rays enter the light guide structure, and the utilization rate of the light rays can be improved.

In some embodiments, when the light homogenizing element is disposed in the light source device, the direction of the light emitted from the light emitting side of the light homogenizing element is perpendicular to the side where the light entering region of the light guide structure is located, and the part of the light can directly enter the light guide structure from the light entering region.

For example, as shown in fig. 3b, the light-emitting direction of the light-emitting side of the first light-homogenizing member 131 is perpendicular to the light-entering region 122 of the light-guiding structure 12, and after the light is emitted by the first light-homogenizing member 131, the direction of the light satisfies the incident regulation, and can directly enter the light-guiding structure 12 from the light-entering region.

In some embodiments, as shown in fig. 2a to 2c, fig. 3a, fig. 5a to 6, and fig. 8 to 10, when the light homogenizing element is disposed in the light source device, the direction of the light emitted from the light emitting side of the light homogenizing element is parallel to the side of the light incident region of the light guide structure, and the part of the light needs to be reflected by at least one step before entering the light guide structure.

For example, as shown in fig. 2a-2c, fig. 3a, fig. 5 a-6, and fig. 8-10, the light exit direction of the light homogenizer is parallel to the light entry region 122 of the light guiding structure 12. A reflecting member 123 is provided on the light exit side of the light unifying member, and the reflecting member 123 is configured to propagate the light emitted from the light exit side toward the side where the plurality of light outcoupling portions of the light guide structure 12 are located.

For example, the reflecting member 123 is a prism, and the light is reflected by the prism to the side of the light incident region 122 of the light guide structure 12; when the prism structure is selected as the reflector 123, the light will be refracted when being emitted, and the refracted light will be focused toward the center of the light guide structure 12, so as to improve the utilization rate of the light.

For example, as shown in fig. 3a, 6, 8-10, the prism uses a triple prism, which can totally reflect the light rays propagating from the light-exiting side of the first light unifying member 131 to the light guide structure 12.

For example, the reflecting member 123 is integrally formed with at least a part of the first smoothing member 131. For example, when the first light uniformizing member 131 is a transparent optical medium (e.g., a transparent substrate), a reflecting mirror surface may be used as the reflecting member 123, and the reflecting mirror surface may be attached to or integrally formed with the transparent optical medium. For example, the end of one of the major planes (i.e., the reflection surface) of the first light uniformizer 131 includes a horizontally extending portion and an inclined portion, which may be regarded as the reflection member 123.

In some embodiments, the light exit side of the light uniforming member and the light guide structure may be spaced apart from each other or integrally connected to each other. For example, as shown in fig. 2a-2c, the light uniforming member 13 is spaced from the light guiding structure 12, and as shown in fig. 5a, 5b and 6, the first light uniforming member 131 or the second light uniforming member 132 is spaced from the light guiding structure 12; for example, as shown in fig. 7, the light exit side of the first light uniformizer 131 is integrally connected to the light guide structure 12.

For example, as shown in fig. 7, the integral connection is realized by a structure having a turn, the manufacturing process of the light guide structure 12 and the first light uniformizing element 131 can be reduced by adopting the integral structure, for example, the formation can be realized by a set of dies, and the integral structure can also reduce the supporting difficulty of the light guide structure 12 and the first light uniformizing element 131, or the number of the used brackets can also be reduced. At least one reflecting member 123 is disposed in the turning structure for reflecting the light emitted from the first light uniformizing member 131 into the light guiding structure 12, for example, as shown in fig. 7, the turning structure includes two reflecting members 123, and the two reflecting members 123 reflect the light twice and then emit the light into the light guiding structure 12.

In some embodiments, as shown in fig. 1-3 b, 5a-10, each of the at least partial light out-coupling portions partially transmits light incident to the light out-coupling portion such that the transmitted light propagates to the next light out-coupling portion; in the plurality of light outcoupling portions, for example, the transmittance of the first light outcoupling portion that receives light is smaller than the reflectance thereof, so that sufficient light is supplied to the following light outcoupling portions of the respective stages for transflective treatment.

In some embodiments, as shown in fig. 8-9, the display device 100 includes an image generation unit, and the light emitted from the light source device 10 is converted into image light by the image generation unit. For example, as shown in fig. 8 and 9, an image generating unit is disposed on each of the light paths of the light emitted from the light guide structure 12, for example, the image generating unit is a liquid crystal panel, and the light emitted from the light source device 10 can be converted into image light by the liquid crystal panel 110.

In some embodiments, as shown in fig. 8-9, the light out-coupling portion of the light guide structure is used for receiving and coupling out the original light, and the coupled-out light is emitted to the liquid crystal screen. For example, the light coupling portion is a transflective element, and the transmittance of the first transflective element for receiving light in the light guide structure is limited to avoid or reduce the transmission of too much light, which results in bright stripes of the liquid crystal screen, or to reflect too much light, which results in dark areas of the liquid crystal screen.

For example, as shown in fig. 8, a first transflective element is provided as an element having a defined transmittance that needs to satisfy the following condition: the brightness of the light rays coupled out by the first transflective element is the same as or close to the brightness of the light rays coupled out by other subsequent transflective elements, and the brightness of the light rays coupled out is uniform, so that local over-brightness or over-darkness is avoided. By defining the transflective ratio of the first transflective element, the liquid crystal screen 110 may cover the area of the light guiding structure 12 where the first transflective element is located, as shown in fig. 8.

In some embodiments, as shown in fig. 9 and 10, at least one light converging element 120 and/or a diffusing element 130 may be disposed between the light guiding structure and the liquid crystal screen. The light converging element 120 can converge the collimated light output by the light guide structure 12 to a required range, and converge the light, so that the light utilization rate is improved; the light diffusion element 130 can diffuse the light, wherein the main propagation direction of the light is unchanged, so the light is still converged to a predetermined range, but the light is further diffused out of a larger area along the predetermined range after passing through the diffusion element 130, so the visible range can be expanded.

For example, as shown in fig. 9 and 10, the display device 100 includes a light converging element 120 and a diffusing element 130; the light emitted from the light source device 10 is processed by the light converging element 120 and the diffusing element 130 in sequence, then transmitted to the image generating unit, and converted into image light after passing through the image generating unit.

For example, the light converging element 120 is a condensing lens, which may be a single lens or a combination of multiple lenses. For example, the lens is one or more of a convex lens, a fresnel lens, and the like.

For example, the light diffusing element 130 may be a diffractive optical element, such as a beam shaper (beam shaper), which spreads light rays passing through the beam shaper and forms a light beam having a specific cross-sectional shape, including but not limited to a line, a circle, an ellipse, a square, or a rectangle; by controlling the microstructure of the diffraction optical element, the diffusion angle, the cross-sectional shape and the like of light can be accurately controlled, and the diffusion effect can be accurately controlled; in addition, the light diffusing element 130 may also be a scattering optical element, such as a diffusing film, for example.

In some embodiments, as shown in fig. 10, the display device is configured in combination with the imaging window as a head-up display system that can form a virtual image of the image light on the outside of the imaging window according to the principle of mirror imaging.

For example, as shown in fig. 10, the imaging window 210 is configured to reflect the image light emitted from the display device 100 to the eye box area 220 of the heads up display system 200, and the user observes the virtual image 230 formed outside the imaging window 210 while not affecting the observation of the external environment.

For example, since the light emitted from the head-up display system 200 is reflected by the imaging window 210 and then reaches the eye box area 220, in the head-up display system 200, the predetermined range in which the light converging element 120 converges the light may be the position of the virtual image 230 at the center of the eye box area 220 relative to the imaging window 210.

For example, the imaging window 210 is light transmissive and reflective, and is made of a material that is both light transmissive and light reflective. For example, the imaging window 210 is a windshield window or a transparent imaging plate, e.g., the windshield window is a windshield, e.g., the transparent imaging plate is transparent glass or transparent plastic. For example, the light is reflected through the windshield to form a virtual image, and the head-up display system may be referred to as a W-HUD (windshield-HUD) and the light is reflected through the transparent imaging plate to form a virtual image, and the head-up display system may be referred to as a (C-HUD).

For example, the imaging window 210 may be a planar sheet of material, or alternatively, may be a curved sheet of material.

In some embodiments, a heads-up display system is provided within the vehicle, with the eye-box area 220 of the heads-up display system located near the eye position of the user. The user may observe static or dynamic information on the virtual image 230 in the heads-up display system 200 while driving the vehicle.

For example, a front windshield, a side window, or a separately provided transparent imaging plate of a vehicle (such as a car, a train, or a tram) is used as the imaging window.

The above are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention.

Claims (24)

1. A light source device, comprising:

the light source structure is used for emitting light rays, and the light rays are source light rays; and the number of the first and second groups,

a light guide structure comprising a light entrance region allowing at least part of the light to enter the light guide structure and comprising a plurality of light out-coupling portions, wherein light incident at each of the at least part of the light out-coupling portions is partially reflected at the light out-coupling portion and is partially out-coupled by the light out-coupling portion, the light guide structure comprising an even-out portion configured to homogenize the light before incident to the light out-coupling portion, and/or the plurality of light out-coupling portions of the light guide structure comprising a plurality of transflective elements enabling the partial reflection and the partial out-coupling;

wherein an orthographic projection of the light source structure on the light guiding structure is at least partially within the light guiding structure.

2. The light source device according to claim 1, wherein:

the plurality of light out-coupling portions include a first light out-coupling portion group and a second light out-coupling portion group that are sequentially arranged in an arrangement direction of the plurality of light out-coupling portions, the first light out-coupling portion group includes a plurality of first light out-coupling portions, and the second light out-coupling portion group includes a plurality of second light out-coupling portions;

the light incident region of the light guide structure is located between the first light out-coupling portion group and the second light out-coupling portion group in the arrangement direction of the plurality of light out-coupling portions, and light entering the light guide structure from the light incident region of the light guide structure is coupled out by the first light out-coupling portion group and the second light out-coupling portion group.

3. The light source device according to claim 2, wherein: the first light out-coupling portion group includes a plurality of first transflective elements, the second light out-coupling portion group includes a plurality of second transflective elements, and the plurality of first transflective elements are opposite to the plurality of second transflective elements with respect to the inclination direction of the arrangement direction of the plurality of light out-coupling portions.

4. The light source device according to claim 2, wherein:

the light source structure comprises a first light source part configured to emit a first source light, a first part of the first source light being in a light path of at least one first light outcoupling part of the first light outcoupling part group, and a second part of the first source light being in a light path of at least one second light outcoupling part of the second light outcoupling part group;

or,

the light source structure comprises a first light source part and a second light source part which are configured to respectively emit a first source light and a second source light in the source light, the first source light emitted by the first light source part is at least positioned in a light path where at least one first light out-coupling part of the first light out-coupling part group is positioned, and the second source light emitted by the second light source part is at least positioned in a light path where at least one second light out-coupling part of the second light out-coupling part group is positioned.

5. The light source device according to claim 4, wherein: the device also comprises a light splitting structure and a polarization conversion structure;

the light splitting structure is configured to split a light ray incident to the light splitting structure into a first light ray having a first polarization characteristic and a second light ray having a second polarization characteristic, the first light ray and the second light ray being polarized light having different polarization characteristics;

the polarization conversion structure is configured to perform at least one polarization conversion process on light incident to the polarization conversion structure to obtain third light, and the third light is polarized light with the second polarization characteristic;

wherein,

the first light corresponds to the first light out-coupling portion group, the second light corresponds to the second light out-coupling portion group, and the polarization conversion structure converts the first light which enters the first light out-coupling portion group or is coupled out by the first light out-coupling portion group into the third light; or

The first source light and the second source light are divided into the first light and the second light, third light obtained after the first light of the first source light is converted by the polarization conversion structure and the second light of the first source light are transmitted to the first light coupling-out part group, and third light obtained after the first light of the second source light is converted by the polarization conversion structure and the second light of the second source light are transmitted to the second light coupling-out part group.

6. The light source device according to claim 5, wherein:

the light splitting structure comprises at least one light splitting element, and the first source light and the second source light are subjected to light splitting treatment by the same light splitting element or different light splitting elements; and/or

The polarization conversion structure includes at least one polarization conversion element, and the first light of the first source light and the first light of the second source light are polarization-converted by the same polarization conversion element or different polarization conversion elements.

7. The light source device according to any one of claims 1 to 6, wherein: the light guide structure further comprises a light guide medium, the light out-coupling parts are at least arranged on the light guide medium, and the light enters the light guide medium and is linearly transmitted or reflected and transmitted in the light guide medium in the arrangement direction of the light out-coupling parts.

8. The light source device according to any one of claims 1 to 4, wherein: also comprises a light homogenizing part which is arranged on the base,

the even light portion includes at least one first even light piece, first even light piece with a plurality of optical coupling-out parts with the range upon range of setting in the direction mutually perpendicular of the array direction of a plurality of optical coupling-out parts or in the array direction of a plurality of optical coupling-out parts sets gradually.

9. The light source device according to claim 8, wherein: the device also comprises a light splitting structure and a polarization conversion structure;

the light splitting structure is configured to split light incident to the light splitting structure into first light and second light, wherein the first light is polarized light with a first polarization characteristic, and the second light is polarized light with a second polarization characteristic; and

the polarization conversion structure is configured to change the polarization characteristics of the first light, so that the first light with the first polarization characteristics is converted into third light which has the second polarization characteristics and is polarized after at least one polarization conversion process of the polarization conversion structure;

the light splitting structure and the polarization conversion structure are arranged on the light inlet side or the light outlet side of the first light homogenizing piece, and the first light is converted by the polarization conversion structure and then propagates to at least part of the light out-coupling parts.

10. The light source device according to claim 9, wherein:

the light uniformizing part further comprises a second light uniformizing member, the light homogenized by the first light uniformizing member is divided into the first light and the second light by the light splitting structure, and the second light and the third light obtained by converting the first light by the polarization conversion structure are homogenized by the second light uniformizing member and then are transmitted to the side of the light coupling-out parts of the light guide structure.

11. The light source device of claim 10, wherein: the second light homogenizing element and the plurality of light coupling-out parts are arranged in a stacking mode in the direction perpendicular to the arrangement direction of the plurality of light coupling-out parts or are sequentially arranged in the arrangement direction of the plurality of light coupling-out parts;

wherein,

at least one of the first light homogenizing piece and the second light homogenizing piece comprises a first reflecting film and a second reflecting film which are arranged at intervals, and a light transmission space or an optical filling layer is arranged between the first reflecting film and the second reflecting film; and/or

At least one of the first light unifying member and the second light unifying member includes a transparent optical medium in which the light propagates.

12. The light source device according to claim 8, wherein: also comprises a light-gathering part, wherein the light-gathering part,

the light emitted from the light emitting side of the first light homogenizing member is subjected to light condensation processing by the light condensing part and then is transmitted to the plurality of light out-coupling parts of the light guide structure.

13. The light source device of claim 12, wherein: the condensing portion includes a lens or a lens group including at least one of the lenses.

14. The light source device of claim 13, wherein:

the lens is an eccentric lens, and the focal point of the eccentric lens is positioned on one side of the central line of the eccentric lens, which is close to the center of the light guide structure.

15. The light source device according to claim 8, wherein:

the light emitting side of the first light homogenizing piece faces to the side of the light guide structure where the plurality of light out-coupling parts are located; or,

the light guide structure further comprises a reflector, wherein the light outlet side of the first light homogenizing element faces the reflector, and the reflector is configured to enable the light rays emitted from the light outlet side to propagate towards the side of the light guide structure where the plurality of light out-coupling parts are located.

16. The light source device according to claim 15,

the reflector is a prism, and the light rays are reflected to the side of the light-incoming region of the light guide structure by the prism; or alternatively

The reflecting piece and at least part of the first light homogenizing piece are integrally formed.

17. The light source device according to claim 8, wherein:

the light incident to the first light uniformizing part has a non-zero preset divergence angle.

18. The light source device according to claim 17, wherein:

the predetermined divergence angle range is (0, 20; and/or,

the preset divergence angle is larger than or equal to a nonzero included angle between opposite main reflecting surfaces of the first dodging portion, or the opposite main reflecting surfaces of the first dodging portion are parallel.

19. The light source device according to any one of claims 1 to 4, wherein: each of the at least some light out-coupling portions partially transmits light incident to the light out-coupling portion such that the transmitted light propagates to a next light out-coupling portion;

among the plurality of light outcoupling portions, a transmittance of a first light outcoupling portion that receives the light is smaller than a reflectance thereof.

20. A display device, characterized by: comprising a light source device as claimed in any one of claims 1 to 19.

21. The display device according to claim 20, further comprising an image generating unit, wherein the light emitted from the light source device is converted into image light by the image generating unit.

22. The display device according to claim 20 or 21, wherein:

the display device also comprises a light converging element and a diffusing element;

the light emitted by the light source device is processed by the light converging element and the diffusing element, then is transmitted to the image generating unit, and is converted into the image light after passing through the image generating unit.

23. A heads-up display system, comprising: comprises an imaging window and a display device;

wherein the imaging window is configured to reflect the image light emitted by the display device to an eye box area of the heads-up display system;

the heads-up display system comprising the light source apparatus of any one of claims 1-19, or the heads-up display system comprising the display apparatus of any one of claims 20 to 22.

24. A vehicle comprising a light source device according to any one of claims 1 to 19, or comprising a display device according to any one of claims 20 to 22, or comprising a heads-up display system according to claim 23.

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