CN115712165A - Light guide device, light source device and head-up display - Google Patents

Abstract

A light guide device, a light source device and a head-up display are provided. The light guide device comprises a plurality of transflective elements. At least part of the transflective elements are provided with a reflecting medium, at least part of the transflective elements are provided with a reflecting medium with a first reflectivity, and in at least two of the at least part of the transflective elements, the area ratio of the reflecting medium with the first reflectivity to the corresponding transflective elements is different so that the reflectivities of the at least two transflective elements are different; or at least part of the transflective elements are provided with reflective media, the reflective media of at least one transflective element arrangement comprise at least two different reflectivities, and the number of types of reflectivities of the reflective media of the plurality of transflective element arrangements is smaller than the number of the plurality of transflective elements. The light guide device provided by the disclosure can reduce the types of transflective films required by the transflective element, and is beneficial to reducing the cost.

Description

Light guide device, light source device and head-up display

Technical Field

At least one embodiment of the present disclosure relates to a light guide device, a light source device, and a head-up display.

Background

Head-up shows (HUD) and is the optical design through the reflective, with the light that the image source sent finally project imaging window (formation of image board, windshield etc.), the driver need not to bow just can directly see the picture, avoids the driver to bow at the driving process and sees the distraction that the panel board leads to, improves driving safety factor, also can bring better driving simultaneously and experience.

Disclosure of Invention

At least one embodiment of the present disclosure provides a light guide device, a light source device and a head-up display.

At least one embodiment of the present disclosure provides a light guide device, including: a plurality of transflective elements, at least some of the plurality of transflective elements configured to cause a portion of light rays propagating to the transflective elements to exit the light guide by one of reflection and transmission and another portion of light rays propagating to the transflective elements to continue propagating in the light guide by the other of reflection and transmission. The plurality of transflective elements comprises transflective elements provided with a reflective medium, at least some of the transflective elements are provided with a reflective medium having a first reflectivity, and of at least two of the at least some of the transflective elements, the reflective medium having the first reflectivity occupies a different area ratio than the respective transflective elements so that the reflectivities of the at least two transflective elements are different; and/or the multiple transflective elements comprise transflective elements provided with reflective media, the reflective media provided by at least one transflective element comprise at least two different reflectivities, and the number of types of the reflectivities of the reflective media provided by the multiple transflective elements is smaller than the number of the multiple transflective elements.

For example, in at least one embodiment of the present disclosure, the plurality of transflective elements are arranged along the propagation direction of the light in the light guide device.

For example, in at least one embodiment of the present disclosure, the reflectivity of the transflective elements gradually increases or gradually increases in a region along the arrangement direction of the transflective elements.

For example, in at least one embodiment of the present disclosure, the areas of the plurality of transflective elements are the same, and the reflective media disposed on the same transflective element are reflective media with the same reflectivity.

For example, in at least one embodiment of the present disclosure, the reflective medium provided to each of the plurality of transflective elements is the reflective medium having the first reflectivity.

For example, in at least one embodiment of the present disclosure, the reflectivity of the transflective element is positively correlated with the area of the reflective medium in which it is disposed.

For example, in at least one embodiment of the present disclosure, the plurality of transflective elements includes at least two transflective element groups, at least one transflective element group includes at least two transflective elements, the reflective mediums disposed in the same transflective element group are reflective mediums having the same reflectivity, and the reflective mediums located in different transflective element groups are reflective mediums having different reflectivities.

For example, in at least one embodiment of the present disclosure, of at least two transflective elements provided with reflective media having different reflectances, the area ratios of the reflective media occupying the respective transflective elements are the same.

For example, in at least one embodiment of the present disclosure, in a transflective element group comprising at least two transflective elements, the reflectivity of the transflective elements is positively correlated with the area of the reflective medium in which the transflective elements are disposed.

For example, in at least one embodiment of the present disclosure, the reflective medium of at least one transflective element arrangement includes at least two reflective media with different reflectivities.

For example, in at least one embodiment of the present disclosure, the reflective medium disposed in each of the at least two transflective elements includes at least two reflective media having different reflectivities, and the area ratio of one reflective medium having the first reflectivity to the corresponding transflective element in different transflective elements is different so that the reflectivities of the different transflective elements are different.

For example, in at least one embodiment of the present disclosure, the reflective medium of each of the at least two transflective elements includes at least two reflective media having different reflectivities, and the reflectivities of different transflective elements are different; the area ratio of the reflective medium to the surface of the respective transflective elements is the same in different transflective elements, or the area ratio of the reflective medium to the surface of the respective transflective elements is different in different transflective elements.

For example, in at least one embodiment of the present disclosure, a portion of the transflective element further includes a blank region including a region of the transflective element where the reflective medium is not disposed.

For example, in at least one embodiment of the present disclosure, the reflective medium in each of a portion of the transflective elements is uniformly distributed.

For example, in at least one embodiment of the present disclosure, the light guide device further includes: a light guide medium configured to cause light entering the light guide medium to propagate with total reflection and/or non-total reflection.

For example, in at least one embodiment of the present disclosure, the reflective medium of at least one transflective element arrangement includes a layer of reflective film; alternatively, the reflective medium of at least one transflective element arrangement comprises a stack of multilayer reflective films comprising a plurality of tantalum pentoxide, titanium dioxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminium fluoride.

For example, in at least one embodiment of the present disclosure, in at least two of the at least partially transflective elements, the area ratios of the reflective media having the same reflectivity to the respective transflective elements are different such that the reflectivities of the at least two transflective elements are different.

At least one embodiment of the present disclosure provides a light guide device, including: a plurality of transflective elements, at least a portion of the plurality of transflective elements configured to cause a portion of the light rays propagating to the transflective elements to exit the light guide by one of reflection and transmission and to cause another portion of the light rays propagating to the transflective elements to continue propagating in the light guide by the other of reflection and transmission. The plurality of transflective elements comprises transflective elements provided with transflective media, at least some of the transflective elements are provided with transflective media having a first transmissivity, and of at least two of the at least some of the transflective elements, the transflective media having the first transmissivity occupy different area ratios of the respective transflective elements so that the transmissivity of the at least two transflective elements is different; or the plurality of transflective elements comprise transflective elements provided with transflective media, the transflective media provided by at least one transflective element comprise at least two different transmittances, and the number of transmittance types of the transflective media provided by the plurality of transflective elements is smaller than the number of the plurality of transflective elements.

At least one embodiment of the present disclosure provides a light source device, including: a light source unit; and any one of the above light guide devices, wherein the light emitted by the light source part enters the light guide device.

At least one embodiment of the present disclosure provides a head-up display, including: a display device; and a reflective imaging section configured to reflect light emitted from the display device to an observation area of the head-up display, the display device including a display panel and the light source device; alternatively, the head-up display includes: a reflective imaging part and any one of the light guide devices, wherein the reflective imaging part is configured to reflect the light emitted by the light guide device to an observation area of the head-up display; alternatively, the head-up display includes: the reflection imaging part is configured to reflect the light emitted by the light source device to an observation area of the head-up display.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a schematic partial cross-sectional structural view of a light guide device provided according to an embodiment of the present disclosure;

fig. 2A to 2H are schematic partial plan views of transflective elements provided according to embodiments of the present disclosure;

fig. 3A and 3B are schematic partial plan view structures of transflective elements provided in accordance with another example of the embodiments of the present disclosure;

fig. 4A and 4B are schematic partial plan view structures of transflective elements provided in accordance with another example of the embodiments of the present disclosure;

fig. 5A and 5B are schematic partial plan view structures of transflective elements provided in accordance with another example of the embodiments of the present disclosure;

fig. 6 is a schematic partial cross-sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure;

fig. 7 is a schematic partial cross-sectional structure view of a light guide apparatus provided according to another example of the embodiment of the present disclosure;

fig. 8 is a schematic partial cross-sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure;

fig. 9 is a schematic partial cross-sectional structure view of a light guide apparatus provided according to another example of the embodiment of the present disclosure;

fig. 10 is a partial cross-sectional structural view of a display device provided in accordance with another example of the disclosed embodiment; and

fig. 11 is a schematic partial cross-sectional view of a head-up display according to an embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. For clarity, elements in the figures used to describe embodiments of the present disclosure are enlarged or reduced, i.e., the figures are not limited to actual scale. Reference to "at least one" in this disclosure means "one or more," and reference to "a plurality" in this disclosure means "at least two," i.e., "two or more.

The light guide device, the light source device, and the head-up display provided in the embodiments of the present disclosure are described below with reference to the accompanying drawings and specific embodiments, it should be noted that the same components may be arranged in the same manner, all the embodiments of the present disclosure are applicable to multiple protection topics such as the light guide device, the light source device, and the head-up display, and the same or similar contents are not repeated in each protection topic, and reference may be made to the description in the embodiments corresponding to other protection topics. In the research, the inventors of the present application found that, for a light guide element using an array of transflective elements as the coupling-out elements, the reflectivities of the array of transflective elements therein are gradually changed and are different from each other. The reflectivity of a plurality of the transflective elements in the array of transflective elements is gradually increased, for example, along the direction of propagation of the light ray in the light guiding element. For example, the number of the plurality of transflective elements may be 8, the reflectivities of the 8 transflective elements may be sequentially set to 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2, and 1, respectively, along the propagation direction of the light ray in the light guide element, a reflective film having different reflectivities is disposed on each transflective element, and then 8 reflective films having different reflectivities may be disposed on the 8 transflective elements. Therefore, for the same light guide element, reflective films with different reflectivities need to be arranged on different transflective elements, which often needs a plurality of transflective elements with different reflectivities, and almost every transflective element needs to be separately processed and designed, thereby increasing the cost.

At least one embodiment of the present disclosure provides a light guide device, a light source device, and a head-up display. The light guide device includes: a plurality of transflective elements, at least a portion of the plurality of transflective elements configured to cause a portion of the light rays propagating to the transflective elements to exit the light guide by one of reflection and transmission, and to cause another portion of the light rays propagating to the transflective elements to continue propagating in the light guide by the other of reflection and transmission. The plurality of transflective elements comprise transflective elements provided with a reflective medium, at least part of the transflective elements are provided with a reflective medium having a first reflectivity, and of at least two of the at least part of the transflective elements, the reflective medium having the first reflectivity occupies different area ratios of the respective transflective elements so that the reflectivities of the at least two transflective elements are different; and/or the plurality of transflective elements comprise transflective elements provided with reflective media, the reflective media provided by at least one of the transflective elements comprise at least two different reflectivities, and the number of types of reflectivity of the reflective media provided by the plurality of transflective elements is less than the number of the plurality of transflective elements. In the embodiment of the disclosure, by arranging the reflection medium with the reflectivity being the first reflectivity on at least two transflective elements, and/or setting the number of the reflectivity types of the reflection medium to be less than the number of the plurality of transflective elements, the types of transflective films required by the transflective elements can be reduced, which is beneficial to reducing the cost of the light guide device.

The following describes a light guide device, a light source device, and a head-up display provided in an embodiment of the present disclosure with reference to the drawings.

Fig. 1 is a schematic partial sectional structure diagram of a light guide device provided according to an embodiment of the present disclosure. As shown in fig. 1, the light guide comprises a plurality of transflective elements 0110, at least part of the transflective elements 0110 being configured to cause a portion of the light rays propagating to the transflective elements 0110 to exit the light guide by one of reflection and transmission, and another portion of the light rays propagating to the transflective elements 0110 to continue to propagate in the light guide by the other of reflection and transmission. The disclosed embodiments schematically show that at least part of the transflective element 0110 is configured to reflect a portion of the light rays propagating to the transflective element 0110 out of the light guide and transmit another portion of the light rays to continue propagating in the light guide. In the embodiment of the disclosure, the transflective element may be used as a light outcoupling portion of the light guide device, and may couple out light propagating in the light guide device to an area. For example, one of the plurality of transflective elements that is farthest from the light-entering side of the plurality of transflective elements may have a reflectivity of 95% or more, or a transmissivity of 5% or less, e.g., the transflective element may reflect only light.

For example, the transflective element may include a dot structure disposed in a light exit area (e.g., a light exit surface) of the light guide device, such that a portion of the light may be transmitted out of the light guide device by the dot structure by destroying a reflection angle of the light totally reflected in the light guide device, and a portion of the light may be reflected by the dot structure to continue propagating in the light guide device.

As shown in fig. 1, the plurality of transflective elements 0110 includes transflective elements provided with a reflective medium 0111, at least some of the transflective elements 0110 are provided with a reflective medium 0111 having a first reflectivity, and of at least two of the at least some of the transflective elements 0110, the reflective medium 0111 having the first reflectivity occupies a different area ratio than the corresponding transflective elements 0110 such that the reflectivities of the at least two transflective elements 0110 are different; or, the multiple transflective elements 0110 include transflective elements provided with the reflective medium 0111, the reflective medium 0111 provided by at least one of the transflective elements 0110 includes at least two different reflectivities, and the number of the reflectivity types of the reflective medium 0111 provided by the multiple transflective elements 0110 is smaller than the number of the multiple transflective elements 0110. In the embodiment of the disclosure, the reflective media with the reflectivity being the first reflectivity are arranged on at least two transflective elements, or the number of the reflectivity types of the reflective media is set to be smaller than that of the plurality of transflective elements, so that the types of transflective films required by the transflective elements can be reduced, and the cost of the light guide device can be reduced.

For example, the reflective medium provided in the at least one transflective element may be a medium including one reflective film or a medium including a plurality of reflective films, and the reflectance of the reflective medium refers to the reflectance of the entire multi-film layer included in the reflective medium. For example, the reflective medium may be a transflective medium, the transflective medium may be a medium including one transflective film, or may be a medium including a plurality of transflective films, and the transmittance of the transflective medium refers to the transmittance of the entire film layer included in the transflective medium. For example, the reflective medium of at least one transflective element arrangement includes a stack of multilayer reflective films comprising a plurality of tantalum pentoxide, titanium dioxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride, and aluminum fluoride.

For example, each of the plurality of transflective elements is provided with a reflective medium. For example, the transflective element closest to the light incident side of the plurality of transflective elements may not be provided with a reflective medium, and the transflective element may be a light-transmissive surface of a transparent substrate capable of reflecting a portion of light and transmitting another portion of light.

For example, as shown in fig. 1, a plurality of transflective elements 0110 are arranged along a direction of propagation of light rays in the light guide. For example, the reflectivity of the plurality of transflective elements 0110 gradually increases or gradually increases regionally along the arrangement direction of the plurality of transflective elements 0110.

The "propagation direction of the light in the light guide device" may refer to the overall (macroscopic) direction of the light propagation, for example, the direction of the light propagation in the light guide device refers to the direction opposite to the arrow in the X direction shown in fig. 1, and the light entering the light guide device may be propagated by total reflection in the light guide device and/or may also be propagated by non-total reflection, which is not limited by the embodiment of the present disclosure. The term "non-total reflection propagation" as used herein means that the light ray does not satisfy the total reflection condition when propagating through the light guide device, for example, the incident angle on the surface of the light guide device is smaller than the critical angle of total reflection, for example, the main direction of the light ray incident on the light guide device or the propagation direction of the main optical axis of the light ray incident on the light guide device is a direction parallel to a straight line, for example, the main direction may be parallel to the X direction, and some light rays continue to propagate after being specularly reflected. "parallel" in the disclosed embodiments includes perfectly parallel, which means an included angle of 0 ° between any two, and substantially parallel, which means an included angle of not more than 20 ° between any two, for example, an included angle of not more than 10 ° between any two. For example, the included angle between any two is no greater than 5 °.

For example, the above-mentioned "the reflectance of the plurality of transflective elements 0110 gradually increases" means that the reflectance of the plurality of transflective elements is different from each other, and the reflectance of the plurality of transflective elements tends to gradually increase along the arrangement direction of the plurality of transflective elements. For example, the number of the plurality of transflective elements may be 8, and the reflectivities of the 8 transflective elements may be sequentially set to 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2, and 1, respectively, along the propagation direction of the light ray in the light guide device (e.g., the arrangement direction of the plurality of transflective elements).

For example, the above-mentioned regionally gradually increasing may mean: the plurality of transflective elements are divided into two or more regions (at least one region includes at least two transflective elements), and the reflectivities of the transflective elements in the different regions are different and tend to gradually increase as a whole. For example, when a region includes a plurality of transflective elements, the plurality of transflective elements in the region are disposed adjacently, and it can be considered that no transflective element belonging to another region is disposed between any two transflective elements in the plurality of transflective elements in the region. For example, when one region includes a plurality of transflective elements, the reflectances of the transflective elements may be the same or different, and when the reflectances of the transflective elements are different, the reflectances may be gradually changed (for example, the reflectances may be set to 1/8, 1/7, and 1/6), and of course, the reflectances may not have a specific change law (for example, the reflectances may be set to 1/8, 1/7, and 1/8), and the plurality of regions may gradually change as a whole.

For example, as shown in fig. 1, the light guide device includes a light guide medium 123, for example, the light guide medium 123 includes a transparent material, for example, the light guide medium 123 may be a transparent substrate made of a transparent material such as resin, glass, or plastic, and the transparent substrate is configured to perform total reflection propagation and/or non-total reflection propagation on the light entering the light guide medium 123. For example, the light guide medium 123 includes air.

The above-mentioned "non-total reflection propagation" refers to a propagation mode in which light (e.g., a part of light with a small divergence angle) propagates in the light guide medium 123 except for total reflection, for example, light may propagate in the light guide medium 123 without being reflected (e.g., without being reflected on an interface between the light guide medium 123 and air); alternatively, the light (e.g., a part of the light with a large divergence angle) may be reflected and propagated in a non-total reflection manner, for example, it may not satisfy a total reflection condition, for example, the reflection angle when the light is reflected on the interface between the light guide medium 123 and the air (or other medium) is smaller than the critical angle of total reflection, and it may be considered that the light is not or rarely reflected and propagated in the light guide medium. For example, the main direction of the light ray incident on the light guide medium or the main optical axis propagation direction of the light ray incident on the light guide medium is a direction parallel to a straight line, and may be parallel to the X direction, for example, or may be continued after some light rays are specularly reflected.

The "total reflection propagation" mentioned above may mean that the reflection angle at which a light ray (for example, a light ray having a large partial divergence angle and satisfying the total reflection condition) is reflected on the interface between the light guide medium 123 and the air (or other medium) is not smaller than the total reflection critical angle. For example, light incident on the light guide medium propagates mostly by total reflection. For example, a part of the light incident on the light guide medium is hardly reflected and propagates in the light guide medium along a straight line, and another part of the light continues to propagate after being totally reflected.

For example, the light guide medium 123 is made of a material that can perform a waveguide function, and is typically a transparent material having a refractive index greater than 1. For example, the material of the light guiding medium 123 may include one or more of Silicon dioxide, lithium niobate, silicon-on-insulator (SOI), a high molecular polymer, a group iii-v semiconductor compound, glass, and the like.

For example, the light guide medium 123 may be a planar substrate, a stripe-shaped substrate, a ridge-shaped substrate, and the like. For example, in at least one example of the embodiments of the present disclosure, the light guide medium employs a planar substrate to form a uniform surface light source.

For example, the transflective elements 0110 can be surfaces of the light guide medium 123. For example, the light guide medium 123 may be divided into a plurality of cylinders (e.g., parallelepipeds) having a parallelogram cross section, and the transflective elements 0110 may be disposed between the spliced cylinders. For example, the pillar may include two surfaces opposite to each other, one of the two surfaces may be a light incident surface of the pillar, and the other surface is located at a back side of the light incident surface. For example, the transflective element may be a surface of the light incident surface of the pillar, or a surface of the pillar opposite to the light incident surface. For example, the reflective medium may be plated or otherwise affixed to the transflective element, i.e., may be disposed on the surface of a cylinder, such as the surface where the cylinders are spliced together.

For example, the light guide medium 123 includes a plurality of waveguide sub-media arranged along the X direction and attached to each other, a reflective medium is interposed between adjacent waveguide sub-media, each waveguide sub-medium is configured to cause total reflection of light, and the transflective element 0110 including a reflective medium is configured to couple a part of light out of the light guide device by reflecting a total reflection condition that destroys the part of light.

For example, when the light guide medium 123 is air, the plurality of transflective elements (for example, transflective element arrays) can be fixed by means of a support plate, an adhesive, or the like, and thus the light guide device can be reduced in weight and is highly practical.

For example, when the light guide medium 123 is a transparent substrate, the light emitting surface of the light guide medium 123 may be a solid surface, such as one surface of the transparent substrate. For example, when the light guide medium 123 is air, the light emitting surface of the light guide medium may be a non-solid virtual surface.

For example, the embodiment of the disclosure is described by taking an example that the multiple transflective elements 0110 are all parallel to each other, and at this time, the light emitted from the multiple transflective elements 0110 is parallel light, for example, the light coupled out by the multiple transflective elements 0110 may be collimated light, for example, the collimation direction is perpendicular to the light emitting surface, or is inclined to the light emitting surface; the direction consistency of the collimated light is good, and the light utilization rate can be improved. However, the embodiments of the present disclosure are not limited thereto, and the plurality of transflective elements may not be parallel, and the light emitted from the plurality of transflective elements may be adjusted to be convergent light or divergent light by adjusting an included angle between the plurality of transflective elements.

For example, as shown in FIG. 1, the tilt directions of the plurality of transflective elements 0110 are the same. The "inclination direction" may refer to an inclination direction of the transflective elements 0110 with respect to the Y direction, for example, a direction indicated by an arrow in the X direction is a right direction, and the plurality of transflective elements 0110 are inclined to a left direction. For example, the tilting direction of the plurality of transflective elements 0110 may all be the same, or may have a certain error range, for example an error range of 0 ° -10 °.

For example, fig. 2A to 2H are schematic partial plan views of transflective elements provided according to embodiments of the present disclosure. As shown in fig. 2A to 2H, the plurality of transflective elements 0110 includes transflective elements provided with a reflective medium 0111, at least some of the transflective elements 0110 are provided with a reflective medium 0111 having a first reflectivity, and of at least two of the at least some of the transflective elements 0110, the reflective medium 0111 having the first reflectivity occupies a different area ratio in the corresponding transflective elements 0110 so that the reflectivities of the at least two transflective elements 0110 are different. For example, the first reflectivity may refer to at least one specific reflectivity, such as at least one of 80%, 70%, 60% and other values. For example, in the at least two transflective elements 0110, the reflective medium 0111 has a first reflectivity, the first reflectivity is a specific reflectivity, for example, the first reflectivity is 60%, and the at least two transflective elements 0110 have the same reflectivity; alternatively, in the at least two transflective elements 0110, the reflective medium 0111 has a first reflectivity, the first reflectivity includes a plurality of specific reflectivities, for example, the first reflectivity includes 60% and 80%, and it can be considered that the at least two transflective elements 0110 are each provided with a reflective medium having a reflectivity of 60% and a reflective medium having a reflectivity of 80%.

For example, at least some of the transflective elements 0110 are provided with reflective media 0111 having the same reflectivity, and of at least two of the transflective elements 0110, the reflective media 0111 having the same reflectivity occupy different area ratios of the respective transflective elements 0110 such that the reflectivities of the at least two transflective elements 0110 are different. The above-mentioned "same reflectance" may refer to the same reflectance, including the exact same reflectance and the approximately same reflectance, and the approximately same reflectance refers to a ratio of a difference between the reflectance of any two to one of them of not more than 10% (e.g., may be not more than 8%, 5%, or 1%).

For example, at least some of the transflective elements 0110 are provided with reflective media 0111 having two or more reflectances, and of at least two of the at least some of the transflective elements 0110, the reflective media 0111 having the same reflectivity occupy different area ratios of the respective transflective elements 0110 such that the reflectances of the at least two of the transflective elements 0110 are different. For example, the reflective medium 0111 comprises two media with a reflectivity of 60% and a reflectivity of 80%, and of the at least two transflective elements 0110, the ratio of the area of the reflective medium with a reflectivity of 60% to the corresponding transflective element 0110 is different, and/or the ratio of the area of the reflective medium with a reflectivity of 80% to the corresponding transflective element 0110 is different, such that the reflectivity of the at least two transflective elements 0110 is different. The above-mentioned "same reflectivity" may refer to the same reflectivity, including the identical reflectivity and the approximately same reflectivity, and the approximately same reflectivity means that the ratio of the difference between the reflectivities of any two to one of them is not more than 10% (for example, may be not more than 8%, 5%, or 1%).

At least one embodiment of the present disclosure reduces the types of reflective media and reduces the manufacturing cost of the transflective elements by providing the reflective media having the first reflectivity (e.g., the same reflectivity) on at least two transflective elements and adjusting the reflectivity of the corresponding transflective elements by adjusting the areas of the reflective media having the same reflectivity on the at least two transflective elements.

For example, fig. 2A to 2H schematically show that the shape of the transflective element 0110 is rectangular, but the shape is not limited thereto, and the shape of the transflective element may be other polygonal shapes such as a circle, an ellipse, or a hexagon.

For example, as shown in fig. 2A to 2H, each of the transflective elements 0110 of the plurality (e.g., all) of the transflective elements is the same in area, and the reflective media 0111 provided by the same transflective element 0110 are reflective media 0111 having the same reflectivity. The term "the same area" may mean that the areas of both are completely the same or substantially the same, and for example, the ratio of the areas of both is 0.8 to 1.2, and for example, may be 0.9 to 1.1.

For example, the reflective medium 0111 may be a material with a relatively high reflectivity, and for example, the reflectivity of the reflective medium 0111 may be not less than 80%. For example, the reflectivity of the reflective medium 0111 can be no less than 90%. For example, the reflectivity of the reflective medium 0111 can be no less than 95%. By providing a reflective medium with a relatively large reflectivity in the same transflective element, the reflectivity of the transflective element can be made to have a relatively large adjustable range, i.e. the transflective element can be adjusted to have a relatively large reflectivity (e.g. the same reflectivity as the reflective medium) or a relatively small reflectivity (e.g. a reflectivity of less than 40%). Of course, the embodiments of the present disclosure are not limited thereto, and according to the position of the transflective element and the requirement for the reflectivity, the reflective medium disposed in some transflective elements may also be made of a material with a lower reflectivity.

For example, as shown in fig. 2A to 2H, the reflective media 0111 of all the transflective elements 0110 are reflective media 0111 with the first reflectivity. For example, a reflective medium 0111 having the same reflectivity is disposed over all the transflective elements 0110. For example, the reflective medium 0111 of the multiple transflective elements 0110 may be the reflective medium 0111 made of the same material, so that the types of the reflective media are greatly reduced, and the manufacturing cost of the product is reduced.

For example, as shown in fig. 2A to 2H, the reflectivity of the transflective element 0110 is positively correlated with the area of the reflective medium 0111 disposed therein. For example, for one transflective element 0110, the larger the area of the reflective medium 0111 provided, the larger the reflectivity of the transflective element 0110, and when the area of the reflective medium 0111 is almost the same as the surface area of the transflective element 0110, the reflectivity of the transflective element 0110 reaches a maximum, which may be almost equal to the reflectivity of the reflective medium 0111. When the area of the reflective medium 0111 is smaller than the surface area of the transflective element 0110, the reflectance of the transflective element 0110 is smaller than the reflectance of the reflective medium 0111, and thus, by adjusting the area of the reflective medium 0111 in which the transflective element 0110 is provided, the reflectance of the transflective element 0110 can be adjusted.

For example, as shown in fig. 2A to 2H, the partial transflective elements 0110 further include blank regions 0112, and the blank regions 0112 include regions where the transflective elements 0110 are not provided with the reflective medium 0111. For example, the region of the transflective element 0110 other than the reflective medium 0111 is the blank region 0112. The reflectivity of a transflective element may be adjusted by adjusting the area ratio of the reflective medium to the clear area on the element, wherein the greater the area ratio of the reflective medium to the clear area, the higher the reflectivity of the element. For example, the plurality of transflective elements may be surfaces of a plurality of parallelepipeds included in the light guiding medium (e.g., surfaces on which the plurality of parallelepipeds are tiled), and the empty area may be an area of the surfaces where no reflective medium is disposed.

For example, the area ratio of the reflective medium 0111 to the blank area 0112 in the transflective element 0110 shown in fig. 2A is greater than the area ratio of the reflective medium 0111 to the blank area 0112 in the transflective element 0110 shown in fig. 2B, and the reflectivity of the transflective element 0110 shown in fig. 2A is greater than the transflective element 0110 shown in fig. 2B. Fig. 2A and 2B schematically show that the reflective media 0111 extend along the U direction and are arranged along the V direction, but the embodiment of the disclosure is not limited thereto, and the reflective media may also be arranged to extend along the V direction and be arranged along the U direction, where the U direction and the V direction may be interchanged.

For example, fig. 2C and 2D schematically show that the reflective medium 0111 extends in a direction intersecting the U-direction and the V-direction, and by adjusting the area ratio of the reflective medium 0111 to the blank regions 0112, the reflectivity of the respective transflective elements 0110 can be adjusted.

For example, fig. 2E and 2F schematically show that the shape of the reflective medium 0111 is circular, and by adjusting the area ratio of the reflective medium 0111 to the clear area 0112, the reflectivity of the corresponding transflective element can be adjusted.

For example, fig. 2G and 2H schematically show that the shape of the reflective medium 0111 is rectangular, and by adjusting the area ratio of the reflective medium 0111 to the blank area 0112, the reflectivity of the corresponding transflective elements can be adjusted.

Of course, the shape of the reflective medium is not limited to the elongated shape or the circular shape shown in the figure, and may be other shapes, such as a regular shape like an ellipse, a polygon, or other irregular shapes.

For example, as shown in fig. 2A to 2H, the reflective media 0111 of the transflective elements 0110 may each adopt a reflective film with a reflectivity of 80%, the number of the transflective elements 0110 is four, for example, and the reflectivities of the four transflective elements 0110 may be set to 20%, 40%, 60%, and 80% respectively along the propagation direction of the light, that is, other reflectivities lower than 80% reflectivity may be achieved by adjusting the area ratio of the reflective media with the reflectivity of 80% on different transflective elements.

For example, the duty cycle may be adjusted to achieve a lower reflectivity. For example, the duty ratio in the embodiment of the present disclosure may refer to an area ratio of the reflection medium to the blank region provided by the transflective element, or an area ratio of the blank region to the reflection medium. For example, one half of the area of one transflective element 0110 may be provided with a reflective medium 0111, and the other half of the area may be provided with a blank area 0112, and the amount of light reflected (e.g., the intensity of light reflected, the amount of light flux, etc.) by the first transflective element 0110 may be reduced relative to another transflective element 0110 whose surface is filled with the reflective medium 0111. Other implementations of lower reflectivity are similar, as can adjusting the area fraction of the reflective medium on different transflective elements.

For example, as shown in fig. 2A to 2H, the reflective medium 0111 in each of the partial transflective elements 0110 is uniformly distributed, so that the light emitted from the light guide device can be more uniform. The uniform distribution of the reflective medium may include a cross distribution of the reflective medium and the blank area, and may include an equidistant distribution of the reflective medium in a certain direction (e.g., a V direction, a U direction, or a direction intersecting both the U direction and the V direction).

For example, the distribution of the reflective medium 0111 may also be non-uniformly distributed (e.g., a distribution form similar to a two-dimensional code lattice) or randomly distributed, so that the ratio of the total area of the reflective medium 0111 to the area of the blank area meets the requirement.

For example, a diffusion element may be disposed on the light-emitting surface of the light guide device, so as to further improve the uniformity of the light emitted from the transflective element through diffusion.

For example, fig. 3A and 3B are schematic partial plan structure views of a transflective element provided according to another example of an embodiment of the present disclosure. For example, fig. 3A and 3B schematically show that the transflective elements 0110 are rectangular in shape, but are not limited thereto and may be circular, elliptical, hexagonal, or other polygonal shapes.

For example, as shown in fig. 1, fig. 3A and 3B are different from the example shown in fig. 2A to 2H in that a plurality of transflective elements 0110 include at least two transflective element groups 011, at least one transflective element group 011 includes at least two transflective elements 0110, and the reflective media 0111 provided in the same transflective element group 011 are reflective media 0111 having the same reflectance, and the reflective media 0111 located in different transflective element groups 011 have different reflectances. For example, in the multiple transflective elements 0110 in this example, the reflective medium 0111 made of the same material is disposed in the same transflective element 0110, and the reflective medium 0111 made of different materials may be disposed in at least two different transflective elements 0110. In this example, the shape of the transflective element, the shape of the reflective medium, and the distribution thereof may be the same as those of the transflective element, the shape of the reflective medium, and the distribution thereof in the example shown in fig. 2A to 2H, and thus, the description thereof is omitted.

For example, the number of the plurality of transflective elements 0110 may be N, and the N transflective elements 0110 include a number of transflective element groups 011 that is less than N. For example, the number of the transflective elements 0110 provided in one transflective element group 011 or some transflective element groups 011 may be greater than 1, and in the embodiment of the present disclosure, the number of the transflective element groups and the number of the transflective elements in each transflective element group may be set according to product requirements.

For example, the reflectivity of the reflective medium 0111 on the transflective element 0110 shown in fig. 3A is different from the reflectivity of the reflective medium 0111 on the transflective element 0110 shown in fig. 3B, and the transflective element 0110 shown in fig. 3A and the transflective element 0110 shown in fig. 3B are respectively located in two different transflective element groups 011.

For example, in at least two transflective elements 0110 in which reflective media 0111 having different reflectances are provided, the area ratio of the reflective media 0111 to the corresponding transflective elements 0110 is the same. For example, the area ratio of the reflective medium 0111 to the transflective elements 0110 of the arrangement of the transflective elements 0110 shown in fig. 3A is a, and the area ratio of the reflective medium 0111 to the transflective elements 0110 of the arrangement of the transflective elements 0110 shown in fig. 3B is a, but since the reflectances of the reflective media 0111 to the arrangement of two transflective elements 0110 are different, the reflectances of the two transflective elements 0110 are different even if the area ratios of the reflective media 0111 to the corresponding transflective elements 0110 to the arrangement of two transflective elements 0110 are the same.

For example, in the transflective element group 011 in which at least two transflective elements 0110 are provided, the reflectance of the transflective elements 0110 is positively correlated with the area of the reflective medium 0111 provided thereto. For example, for one transflective element 0110, the larger the area of the reflective medium 0111 provided, the larger the reflectivity of the transflective element 0110, and when the area of the reflective medium 0111 is almost the same as the surface area of the transflective element 0110, the reflectivity of the transflective element 0110 reaches a maximum, which may be almost equal to the reflectivity of the reflective medium 0111. When the area of the reflective medium 0111 is smaller than the surface area of the transflective element 0110, the reflectance of the transflective element 0110 is smaller than the reflectance of the reflective medium 0111, and thus, by adjusting the area of the reflective medium 0111 in which the transflective element 0110 is provided, the reflectance of the transflective element 0110 can be adjusted.

For example, the reflective medium 0111 of the transflective elements 0110 shown in fig. 3A may be a reflective film having a reflectivity of 80%, the reflective medium 0111 of the transflective elements 0110 shown in fig. 3B may be a reflective film having a reflectivity of 60%, and the number of the plurality of transflective elements 0110 is four, for example, and the reflectivities of the four transflective elements 0110 are set to 20%, 40%, 60%, and 80%, respectively, along the propagation direction of the light. For example, a reflective medium 0111 with a reflectivity of 60% may be disposed on the transflective element 0110 with a reflectivity of 60%, and the reflective medium 0111 fills up the surface of the transflective element 0110; a reflective medium 0111 with the reflectivity of 80% can be arranged on the transflective element 0110 with the reflectivity of 80%, and the reflective medium 0111 occupies the surface of the transflective element 0110; by adjusting the area ratio of the reflection medium 0111 having a reflectivity of 80% to the surfaces of the other two transflective elements 0110, transflective elements 0110 having a reflectivity of 20% and 40%, respectively, can be realized, or by adjusting the area ratio of the reflection medium 0111 having a reflectivity of 60% to the surface of one transflective element 0110, by adjusting the area ratio of the reflection medium 0111 having a reflectivity of 80% to the surface of the other transflective element 0110 having a reflectivity of 20% and 40%, respectively. Thus, the present example can realize a transflective element having a lower reflectance by using two reflective media having different reflectances, and can obtain an effect of more uniform light exiting from the transflective element by realizing a transflective element having different reflectances by using at least two reflective media having different reflectances.

In at least one example of the present disclosure, the transflective elements include the blank regions 0112, and by adjusting the area ratio of the reflective medium 0111 to the blank regions 0112, the reflectivity of the corresponding transflective elements can be adjusted.

For example, fig. 4A and 4B are schematic partial plan view structures of transflective elements provided according to another example of the embodiments of the present disclosure. For example, fig. 4A and 4B schematically show that the shape of the transflective element 0110 is rectangular, but is not limited thereto, and the shape of the transflective element may be other polygonal shapes such as a circle, an ellipse, or a hexagon.

Fig. 4A and 4B are different from the examples shown in fig. 2A to 2H in that: all the transflective elements 0110 are provided with a reflective medium 0111, the reflective medium 0111 provided by at least one of the transflective elements 0110 comprises at least two different reflectivities, and the number of the types of reflectivities of the reflective media 0111 provided by the plurality of transflective elements 0110 is less than the number of the plurality of transflective elements 0110. In the transflective element provided by this example, by providing at least one transflective element with at least two reflective media with different reflectances, and setting the number of types of reflectances of the reflective media to be smaller than the number of the plurality of transflective elements, for example, the sum of the numbers of types of reflectances of the reflective media provided by all the transflective elements is smaller than the number of all the transflective elements, while making the outgoing light of the transflective element more uniform, it is beneficial to reduce the manufacturing cost of the transflective element.

For example, as shown in fig. 4A and 4B, the reflective medium 0111 of the at least one transflective element 0110 arrangement includes at least two reflective media having different reflectivities. For example, three reflective media 0111 or four reflective media 0111 having different reflectivities may be disposed on at least one transflective element 0110. For example, some transflective elements 0110 are provided with at least two reflective media having different reflectivities, and several reflectivities of the reflective media provided by different transflective elements 0110 may be the same or different.

For example, as shown in fig. 4A and 4B, in at least two transflective elements 0110, the reflective medium 0111 provided in each of the at least two transflective elements 0110 includes at least two reflective media (e.g., a first reflective medium 0111-1 and a second reflective medium 0111-2) having different reflectances, and in different transflective elements 0110, the area ratio of one reflective medium 0111 (e.g., the first reflective medium 0111-1 or the second reflective medium 0111-2) having the same reflectivity to the corresponding transflective element 0110 is different so that the reflectances of the different transflective elements 0110 are different.

For example, the transflective element 0110 shown in fig. 4A is provided with a first reflective medium 0111-1 occupying the area ratio of the transflective element 0110 different from the area ratio of the first reflective medium 0111-1 occupying the transflective element 0110 of the transflective element 0110 shown in fig. 4B, and the transflective element 0110 shown in fig. 4A is provided with a second reflective medium 0111-2 occupying the transflective element 0110 different from the area ratio of the second reflective medium 0111-2 occupying the transflective element 0110 of the transflective element 0110 shown in fig. 4B, whereby the reflectance of the corresponding transflective element can be adjusted by adjusting the area ratio of the reflective medium of different reflectance of the transflective element arrangement. Of course, the reflective media with different reflectivities in the embodiments of the present disclosure are not limited to include only two different reflectivities, and may also include a third reflective medium with other reflectivities, and the like, and may be set according to product requirements.

For example, as shown in fig. 4A and 4B, in at least two transflective elements 0110, the reflective medium 0111 provided in each of the at least two transflective elements 0110 includes at least two reflective media (e.g., a first reflective medium 0111-1 and a second reflective medium 0111-2) having different reflectances, the reflectances of the different transflective elements 0110 are different, and the area ratios of the reflective media 0111 to the surfaces of the corresponding transflective elements 0110 in the different transflective elements 0110 are the same.

For example, the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) in the transflective element 0110 shown in fig. 4A to the transflective element 0110 is B, the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) in the transflective element 0110 shown in fig. 4B to the transflective element 0110 is also B, and the area ratio of the reflective medium 0111 to the two transflective elements 0110 is the same, and the reflectivities of the transflective elements can be adjusted by adjusting the areas of the reflective media of different reflectivities on each transflective element to the transflective element. For example, in the transflective element 0110 shown in fig. 4A, the area ratio of the first reflective medium 0111-1 to the transflective element 0110 may be B1, the area ratio of the second reflective medium 0111-2 to the transflective element 0110 may be B2, and B1+ B2= B; in the transflective element 0110 shown in fig. 4B, the area ratio of the first reflective medium 0111-1 to the transflective element 0110 may be B3, the area ratio of the second reflective medium 0111-2 to the transflective element 0110 may be B4, and B3+ B4= B, and then the reflectivities of the two transflective elements may be adjusted by adjusting the values of B1, B2, B3, and B4.

For example, as shown in fig. 4A and 4B, the first reflective medium 0111-1 and the second reflective medium 0111-2 may be reflective films having reflectances of 80% and 60%, respectively, and by adjusting the area ratios of the two reflective films, the reflectances of different transflective elements can be adjusted between 20% and 80%.

In at least one example of the present disclosure, the transflective elements include the blank regions 0112, and by adjusting the area ratio of the reflective medium 0111 to the blank regions 0112, the reflectivity of the corresponding transflective elements can be adjusted.

For example, fig. 5A and 5B are schematic partial plan view structures of transflective elements provided according to another example of the embodiments of the present disclosure. For example, fig. 5A and 5B schematically show that the shape of the transflective element 0110 is rectangular, but is not limited thereto, and the shape of the transflective element may be other polygonal shapes such as a circle, an ellipse, or a hexagon.

For example, as shown in fig. 5A and 5B, the difference from the example shown in fig. 4A to 4B is that: in at least two transflective elements 0110, the reflective medium 0111 provided by each transflective element 0110 includes at least two reflective media (e.g., a first reflective medium 0111-1 and a second reflective medium 0111-2) having different reflectances, the reflectances of different transflective elements 0110 are different, and the area ratios of the reflective media 0111 to the surfaces of the corresponding transflective elements 0110 in different transflective elements 0110 are different.

For example, the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) in the transflective element 0110 shown in fig. 5A to the transflective element 0110 is C, the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) in the transflective element 0110 shown in fig. 4B to the transflective element 0110 is D, and the area ratio of the reflective medium 0111 to the two transflective elements 0110 is different, and the reflectivity of each transflective element can be adjusted by adjusting the area of the reflective medium of different reflectivity on the transflective element to the transflective element.

For example, in the transflective element 0110 shown in fig. 5A, the area ratio of the first reflective medium 0111-1 to the transflective element 0110 may be 1/4, the area ratio of the second reflective medium 0111-2 to the transflective element 0110 may be 1/4, and the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) to the transflective element 0110 is 1/2; in the transflective element 0110 shown in fig. 5B, the area ratio of the first reflective medium 0111-1 to the transflective element 0110 may be 1/5, the area ratio of the second reflective medium 0111-2 to the transflective element 0110 may be 2/5, and the area ratio of the reflective medium 0111 (including the first reflective medium 0111-1 and the second reflective medium 0111-2) to the transflective element 0110 is 3/5, so that the reflectivities of the two transflective elements can be adjusted by adjusting the area ratio of each reflective medium.

For example, another example of an embodiment of the present disclosure provides a light guide apparatus including a plurality of transflective elements 0110 as shown in fig. 1, at least a portion of the plurality of transflective elements 0110 configured to cause a portion of light rays propagating to the transflective elements 0110 to exit the light guide apparatus by one of reflecting and transmitting and another portion of light rays propagating to the transflective elements 0110 to continue to propagate in the light guide apparatus by the other of reflecting and transmitting. At least part of the transflective elements 0110 are provided with a transflective medium (which may be the reflective medium 0111 shown in fig. 2A-5B) having the property of reflecting a portion of light incident thereon and transmitting another portion of light incident thereon, the reflective medium in any of the above examples also having the property of reflecting a portion of light incident thereon and transmitting another portion of light incident thereon, and thus the reflective medium in any of the above examples may also be referred to as a transflective medium, which in this example may have the same properties as the reflective medium in any of the above examples.

For example, at least some of the transflective elements 0110 are provided with a transflective medium having a first transmittance, and of at least two of the at least some of the transflective elements 0110, the transflective medium having the first transmittance occupies a different area ratio than the corresponding transflective elements 0110 such that the transmittances of the at least two of the transflective elements 0110 are different. For example, the first transmittance may refer to at least one specific transmittance, such as at least one of 20%, 30%, 40%, and other values. For example, in at least two transflective elements 0110, the transflective medium 0111 has a first transmittance, which is a specific reflectance, for example, the first transmittance is 40%, and the at least two transflective elements 0110 all have the same transmittance; alternatively, in the at least two transflective elements 0110, the transflective medium has a first transmittance, the first transmittance comprising a plurality of specific transmittances, for example the first transmittance comprising 40% and 20%, it can be considered that a reflective medium having a transmittance of 40% and a reflective medium having a reflectance of 20% are disposed on each of the at least two transflective elements 0110. For example, at least some of the transflective elements 0110 are provided with transflective media having the same transmittance, and of at least two of the transflective elements 0110, the transflective media having the same transmittance occupy different area ratios of the respective transflective elements 0110 such that the reflectances of the at least two transflective elements 0110 are different. The above-mentioned "same transmittance" may mean the same transmittance, including the exactly same transmittance and the approximately same transmittance, which means that the ratio of the difference between the transmittances of any two to one of them is not more than 10% (for example, may be not more than 8%, 5%, or 1%).

For example, at least part of the transflective elements 0110 are provided with a transflective medium (which may be the reflective medium 0111 shown in fig. 2A-5B) having properties of reflecting a part of the light rays incident thereon and transmitting another part of the light rays incident thereon, the reflective medium in any of the above examples also having properties of reflecting a part of the light rays incident thereon and transmitting another part of the light rays incident thereon, and thus the reflective medium in any of the above examples may also be referred to as a transflective medium, which in this example may have the same properties as the reflective medium in any of the above examples. The transflective medium of the at least one transflective element 0110 arrangement comprises at least two different transmittances, and the plurality of transflective elements 0110 arrangement has a smaller number of transmittance species than the plurality of transflective elements 0110.

For example, at least some of the transflective elements 0110 are provided with transflective media having two or more transmittances, and of at least two of the at least some of the transflective elements 0110, the transflective media having the same transmittance occupy different area ratios of the corresponding transflective elements 0110 such that the reflectances of the at least two transflective elements 0110 are different. For example, the transflective medium includes two media having a transmittance of 40% and a transmittance of 20%, and of the at least two transflective elements 0110, the transflective medium having a transmittance of 40% occupies a different area ratio of the respective transflective elements 0110, and/or the transflective medium having a transmittance of 20% occupies a different area ratio of the respective transflective elements 0110, such that the transmittance of the at least two transflective elements 0110 is different. The above-mentioned "same transmittance" may mean the same transmittance, including the exactly same transmittance and the approximately same transmittance, which means that the ratio of the difference between the transmittances of any two to one of them is not more than 10% (for example, may be not more than 8%, 5%, or 1%).

At least one embodiment of the present disclosure reduces the kinds of transflective media and reduces the manufacturing cost of the transflective elements by providing at least two transflective elements with a transflective medium having a first transmittance (e.g., the same transmittance), and adjusting the reflectances of the respective transflective elements by adjusting the areas of the transflective media having the same transmittance on the at least two transflective elements.

The characteristic of the transmittance of the transflective medium in this example may be considered as a simple alternative to the reflectance characteristic of the reflective medium in any of the above examples, e.g. the trend of the transmittance of the transflective medium in this example may be opposite to the reflectance of the reflective medium in any of the above examples, i.e. it may be understood that a reflective medium with a reflectance of 80% corresponds to (or is considered as) a transflective medium with a transmittance of 20% (here only the reflection and transmission properties of the medium are considered, without referring to the absorption properties, e.g. the reflectance and transmittance of the medium also have substantially opposite trends of change, e.g. the absorbance of the transflective element is 5%, the sum of the reflectance and transmittance of the transflective element may be 95%, which still has opposite trends of change).

For example, fig. 6 is a schematic partial sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure. As shown in fig. 6, the light guide device includes a first light guide element 110 and a second light guide element 120, light entering the light guide device is transmitted to the second light guide element 120 through the first light guide element 110, the second light guide element 120 includes a transflective element array 0100, the first light guide element 110 includes a medium 111 configured to propagate the light and a reflective structure 112 (hereinafter, referred to as a first reflective structure 112) located on at least two sides of the medium 111, and the first reflective structure 112 is configured to reflect the light incident to the first light guide element 110 at least once so that the light is propagated to the second light guide element 120. For example, the first reflective structure 112 is configured to reflect light incident to the first light guide element 110 multiple times to improve uniformity of light exiting the first light guide element 110.

Light emitted from the light source may have uneven brightness (e.g., light emitted from a Light Emitting Diode (LED) is bright in the center and dark at the periphery), and thus, when the light is coupled out from the light guide device, the problem of poor uniformity is likely to occur. The light guide device provided by the embodiment of the disclosure can improve the uniformity of light emitted from the light guide device by arranging the first light guide element which comprises the medium and the first reflection structure.

For example, as shown in fig. 6, the first reflective structures 112 may be located on both sides of the medium 111 in the Y direction to reflect light propagating in the XY plane. For example, the first reflective structure 112 may further include a portion located on at least one side of the medium 111 in a direction perpendicular to the XY plane to reflect light incident to the portion. For example, the first reflective structure 112 may surround the medium 111. For example, the first reflective structure 112 may be disposed at other positions of the medium 111 except for the light incident side and the light emergent side.

For example, the first reflective structure 112 may be an element with a relatively high reflectivity (e.g., a reflectivity greater than 70%), may be a unitary element, may be a polished metal piece, and may include a polished piece of a metal material or a metal alloy material, such as aluminum, copper, or silver.

For example, the first reflective structure 112 may also be a material with a high reflectivity plated or attached on a substrate (e.g., glass, plastic, etc.), for example, a metal reflective surface or a dielectric film (a stacked film of metal oxide, metal nitride, inorganic fluoride, etc.) reflective surface, such as an aluminum-plated, silver-plated, or copper-plated reflective surface, may be disposed on a side surface of the first reflective structure 112 facing the dielectric 111. For example, a surface of the first reflective structure 112 facing the medium 111 may be coated with a high-reflectivity film material, such as an ESR film (Enhanced Specular Reflector).

For example, medium 111 has similar structure and properties to light-guiding medium 123 described above. For example, as shown in fig. 6, the medium 111 may include a transparent substrate. For example, the refractive index of the transparent substrate is greater than 1. For example, the light may propagate in the transparent substrate without being totally reflected, but is not limited thereto. For example, a part of the light propagating in the transparent substrate may propagate in the X direction shown in fig. 6. When the medium 111 includes a transparent substrate, the light propagating in the medium 111 may propagate by total reflection or by non-total reflection, which is not limited by the embodiment of the present disclosure.

For example, the reflective surface of the first reflective structure 112 may be in contact with the surface of the medium 111. For example, the first reflective structure 112 may be a reflective film plated or attached on the surface of the medium 111.

For example, the reflective surface of the first reflective structure 112 may be integrated with the medium 111, for example, the light ray propagates in the medium 111 by a total reflection path (at least a part of the light ray propagates by total reflection), and the first reflective structure 112 may be considered as an inner surface of the medium 111 where the light ray undergoes total reflection.

In the light guide device provided in an example of the present disclosure, by setting the medium as the transparent substrate, the optical path of the light propagating in the medium can be increased, which is beneficial to further improving the uniformity effect of the light.

For example, fig. 7 is a schematic partial sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure. As shown in fig. 7, the medium 111 in the light guide device includes air. For example, the first reflective structure 112 includes at least two sub-reflective surfaces 1120, a cavity 1121 is included between the at least two sub-reflective surfaces 1120, air in the cavity 1121 may be a medium 111 for propagating light, and the cavity 1121 forms a space for light to pass through.

In the light guide device provided by at least one embodiment of the present disclosure, the medium of the first light guide element includes air, and the first reflection structure of the first light guide element reflects light in a non-total reflection manner, so that the light guide device is favorable for reducing the weight of the light guide device and improving the practicability while playing a light uniformizing effect on the propagating light.

For example, as shown in fig. 6, two sub-reflecting surfaces 1120 facing each other are arranged in parallel.

For example, the light guide device includes a first light guide element 110 and a second light guide element 120, light entering the light guide device is transmitted to the second light guide element 120 through the first light guide element 110, the second light guide element 120 includes a plurality of transflective elements, and the first light guide element 110 and the second light guide element 120 are sequentially arranged in an arrangement direction of the plurality of transflective elements or are stacked in a direction perpendicular to the plurality of transflective elements. For example, as in the embodiment shown in fig. 6, the first light guide element 110 and the second light guide element 120 are stacked in a direction perpendicular to the plurality of transflective elements, and may also be considered as being stacked in a direction in which light is emitted from the transflective elements; for example, the first light guide element 110 and the second light guide element 120 may be sequentially disposed in the arrangement direction of the plurality of transflective elements, and may be sequentially arranged left and right in the X direction in the drawing.

For example, as shown in fig. 6 and 7, at least one of the first light guide element 110 and the second light guide element 120 extends in a first direction (i.e., the X direction shown in the figures), e.g., both the first light guide element 110 and the second light guide element 120 extend in the first direction. In a second direction perpendicular to the first direction, the first light guide element 110 and the second light guide element 120 overlap.

For example, as shown in fig. 6 and 7, the first light guide element 110 and the second light guide element 120 are separate structures from each other, i.e., the first light guide element 110 and the second light guide element 120 are not integrally formed structures.

For example, as shown in fig. 7, two sub-reflecting surfaces 1120 facing each other in the first reflecting structure 110 are not parallel.

For example, as shown in fig. 7, the divergence angle of the light incident into the first light guiding element 110 is θ. The divergence angle is a standard for measuring the light-emitting angle of the light beam which is relatively universal at present, for example, theta/2 is an included angle between the light-emitting direction and the optical axis when the light-emitting intensity value is half of the axial intensity value; alternatively, θ/2 can also be the angle between the light emission direction and the optical axis when the light emission intensity value is 60% or 80% of the radial intensity value. For example, the divergence angle of the light rays incident into the first light guiding element 110 may be 40 °. For example, the divergence angle of the light rays incident into the first light guiding element 110 may be 20 °. For example, the divergence angle of the light rays incident into the first light guiding element 110 may be 10 °.

For example, as shown in fig. 7, an angle between two sub-reflecting surfaces 1120 facing each other is greater than 0 ° and equal to or less than θ. For example, an included angle between two sub-reflecting surfaces 1120 facing each other is 40 ° or less. For example, an angle between two sub-reflecting surfaces 1120 facing each other is equal to or less than 30 °. For example, an angle between two sub-reflecting surfaces 1120 facing each other is 20 ° or less. For example, an angle between two sub-reflecting surfaces 1120 facing each other is 10 ° or less.

For example, as shown in fig. 7, the first light guiding element 110 includes a light incident side and a light exiting side, and a distance between two sub-reflecting surfaces 1120 facing each other gradually increases from the light incident side to the light exiting side thereof.

For example, as shown in fig. 7, the second light guide element 120 includes a surface extending in the first direction, and one of the two sub reflection surfaces 1120 of the first reflection structure 112 opposite to each other may be parallel to the surface of the second light guide element 120. For example, one of the two sub reflection surfaces 1120 facing each other near the second light guide element 120 may be parallel to a surface of the second light guide element 120. Of course, the embodiments of the present disclosure are not limited thereto, and neither of the two sub-reflecting surfaces opposite to each other may be parallel to the surface of the second light guide element.

In at least one embodiment of the present disclosure, the two sub-reflective surfaces opposite to each other are not parallel, and an included angle between the two sub-reflective surfaces is smaller than or equal to θ, which is beneficial to reducing the distance of at least a part of the region between the two sub-reflective surfaces, i.e., reducing the thickness of the first reflective structure, which is beneficial to increasing the number of times of light reflection in the first reflective structure, and improving the light uniformization effect of the first light guiding element. In addition, the reflection times of the light rays in the first reflection structure can be increased, and the homogenization effect of the light rays with large angles can be improved.

For example, as shown in fig. 6 and 7, the first light guide element 110 further includes a reflective structure 113 (hereinafter, referred to as a third reflective structure 113) configured to reflect light propagating in the first light guide element 110 into the second light guide element 120. For example, the third reflective structure 113 is located at the light exit side of the medium 111 and the first reflective structure 112 to reflect the light exiting from the medium 111 and the first reflective structure 112 into the second light guiding element 120.

For example, when the medium 111 is a transparent substrate, the third reflective structure 113 may be attached to the medium 111 or integrally formed with the medium 111.

For example, the third reflective structure 113 may include a reflective surface, which may be an element having a relatively high reflectivity, and reflects the light propagating out of the medium 111 and the first reflective structure 112 to the second light guide element 120 by a specular reflection action. For example, the reflective surface may be a metallic reflective surface, such as an aluminized, silvered, or coppered reflective surface.

For example, the third reflective structure 113 may include a prism, and the light rays propagating from the medium 111 and the first reflective structure 112 may be directed to the second light guide element 120 after being totally reflected at the surface of the prism. For example, the prism may be a triangular prism structure. For example, when the light exits through the prism, the light is refracted at an interface between the prism and air or other media (e.g., a second light guide element or optical cement), and the refracted light is deflected toward a central area of the light guide device, which is beneficial to improving the utilization rate of the light.

For example, fig. 8 is a schematic partial sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure. As shown in fig. 8, the light guide device further includes a light conversion portion 200, and the light conversion portion 200 includes a polarization splitting element 210 and a polarization conversion structure 220. The polarization splitting element 210 is configured to split the light emitted to the polarization splitting element 210 into the first polarized light and the second polarized light. For example, the light emitted to the polarization beam splitter 210 includes light having different polarization states, such as natural light, which can be considered as the sum of many light waves having all possible vibration directions. For example, the polarization beam splitter 210 may have a property of transmitting light of one polarization state and reflecting light of another polarization state, and the polarization beam splitter 210 may implement beam splitting using the transflective property described above. The other structures except the light conversion portion 200 in the light guide device provided in this example may have the same features as the corresponding structures in any example shown in fig. 1 to 2H, and are not described again here.

For example, the Polarization Beam Splitter 210 may be a Polarization Beam Splitter (PBS). For example, the polarization splitting element 210 may include a transflective film that performs a beam splitting function by transmitting a portion of the light and reflecting another portion of the light. For example, the transflective film has a transmittance for one of the first polarized light and the second polarized light of the light emitted from the light source section greater than that for the other, and has a reflectance for one of the first polarized light and the second polarized light of the light emitted from the light source section greater than that for the other. For example, the transmittance of the polarization splitting element for the first polarization is greater than the transmittance for the second polarization, and the reflectance of the polarization splitting element for the second polarization is greater than the reflectance for the first polarization. The first polarization light and the second polarization light may be interchanged.

For example, the first polarized light and the second polarized light may both be linearly polarized light, and the polarization directions of the first polarized light and the second polarized light are different, for example, the polarization directions of the first polarized light and the second polarized light are perpendicular.

For example, the first polarized light and the second polarized light may be both circularly polarized light or elliptically polarized light, and the handedness of the first polarized light and the second polarized light is different.

For example, the transmittance of the polarization splitting element 210 for the first polarization is about 20% to about 95%.

For example, the polarization beam splitter 210 has a reflectivity of about 20% to about 95% for the second polarization.

For example, after the unpolarized light passes through the polarization splitting element 210 having a polarization splitting function, the transmitted light includes P-polarized light, and the reflected light includes S-polarized light; or the transmitted light includes S-polarized light and the reflected light includes P-polarized light, which is not limited in this disclosure. For example, one of the first polarized light and the second polarized light is S polarized light, and the other of the first polarized light and the second polarized light is P polarized light.

For example, the polarization beam splitter 210 may include an optical film having a polarization transflective function, such as an optical film that can split an unpolarized light beam into two polarized lights orthogonal to each other by transmission and reflection, such as two linearly polarized lights with polarization directions perpendicular to each other; the optical film can be formed by combining a plurality of film layers with different refractive indexes according to a certain stacking sequence, and the thickness of each film layer is between 10 and 1000 nm; the material of the film layer can be selected from inorganic dielectric materials, such as metal oxides, inorganic fluorides, metal oxynitrides and metal nitrides; polymeric materials such as polypropylene, polyvinyl chloride or polyethylene may also be selected.

For example, as shown in fig. 8, the polarization conversion structure 220 is configured to convert the second polarized light obtained after the light splitting process by the polarization splitting element 210 into the third polarized light, and the polarization state of the third polarized light is the same as that of the first polarized light. For example, the third polarized light may be linearly polarized light, and the polarization direction of the third polarized light is the same as the polarization direction of the first polarized light. For example, the third polarized light may be circularly polarized light or elliptically polarized light, and the handedness of the third polarized light is the same as that of the first polarized light. The above-mentioned "the third polarized light has the same polarization state as the first polarized light" may mean that both are substantially the same regardless of factors such as the conversion efficiency of the polarization conversion structure, for example, both are linearly polarized light having the same polarization direction, or circularly polarized light or elliptically polarized light having the same polarization direction.

For example, fig. 8 schematically illustrates that the polarization conversion structure 220 may be located on one side of the polarization beam splitting element 210 that transmits light, in which case, the light transmitted by the polarization conversion structure 220 includes the second polarized light, and the light reflected by the polarization conversion structure 220 includes the first polarized light; but not limited thereto, the polarization conversion structure may also be located at a side of the polarization splitting element that reflects light, in which case the light transmitted by the polarization conversion structure includes the first polarized light and the light reflected by the polarization conversion structure includes the second polarized light.

For example, the second polarized light may be converted into the third polarized light after passing through the polarization conversion structure 220 only once, and the polarization conversion structure 220 may be a 1/2 wave plate, for example. Of course, the embodiment of the present disclosure is not limited thereto, and the second polarized light may also be converted into the third polarized light after passing through the polarization conversion structure 220 twice, for example, the polarization conversion structure 220 may be a 1/4 wave plate.

For example, as shown in fig. 8, the light conversion part 200 further includes a second reflection structure 230, and the second reflection structure 230 is configured to reflect at least one of the first polarized light, the second polarized light, and the third polarized light.

For example, the light reflected by the polarization beam splitter 210 includes the first polarized light, and the second reflective structure 230 is located on the side of the light reflected by the polarization beam splitter 210 and configured to reflect the first polarized light; for example, the light reflected by the polarization beam splitting element 210 includes second polarized light, the second reflection structure 230 is located on a side of the light reflected by the polarization beam splitting element 210 and located on the light incident side of the polarization conversion structure 220, the second reflection structure 230 is configured to reflect the second polarized light, and the reflected second polarized light is converted into third polarized light through the polarization conversion structure 220; for example, the light reflected by the polarization splitting element 210 includes light of the second polarization, and the second reflecting structure 230 is located on the light-emitting side of the polarization conversion structure 220 and configured to reflect light of the third polarization.

For example, as shown in fig. 8, the second reflective structure 230 may include a reflective surface, which may be an element with a relatively high reflectivity (e.g., greater than 60%, 70%, 80%, 90%, or 95%), and reflects at least one of the first, second, and third polarizations of light into the medium 111 by specular reflection. For example, the reflective surface may be a metallic reflective surface, such as an aluminized, silvered, or coppered reflective surface; alternatively, the reflective surface may be an applied reflective film, such as the ESR reflective film mentioned above.

For example, the second reflecting structure 230 may include a prism, and the light incident to the second reflecting structure 230 may be emitted to the medium 111 after being totally reflected at a surface of the prism. For example, the prism may be a triangular prism structure.

For example, the second light guiding element 120 is configured to transmit the first polarized light and the third polarized light.

For example, as shown in fig. 8, the light conversion part 200 is located at the light incident side of the first light guide element 110, and the first light guide element 110 and the second light guide element 120 are configured to transmit the first polarized light and the third polarized light.

For example, as shown in fig. 8, the medium 111 is air, and at least a portion of the light conversion part 200 is located in the cavity 1121 of the first light guide element 110. In the light guide device provided by at least one embodiment of the present disclosure, at least a portion of the light conversion portion is disposed in the cavity of the first light guide element, which is beneficial to reducing the volume of the light guide device, and also can allow as much light as possible to enter the cavity of the first light guide element, thereby reducing the waste of light.

Fig. 9 is a schematic partial sectional structure diagram of a light guide device provided according to another example of the embodiment of the present disclosure. As shown in fig. 9, the light guide device shown in fig. 9 is different from the light guide device shown in fig. 7 in that: the light conversion part 200 is located on the light exit side of the first light guide element 110, at this time, the light conversion part 200 may replace the third reflection structure 113 shown in fig. 7, and the light conversion part 200 may reflect the light rays emitted to it by the medium 111 and the first reflection structure 112 to the second light guide element 120 while performing polarization splitting, which is beneficial to reducing the volume of the light guide apparatus.

For example, as shown in fig. 9, the medium 111 may be air or a transparent substrate, which is not limited in this example. For example, when the medium 111 is air, the light conversion part 200 is disposed outside the cavity of the first light guide element 110, so that the distance between the two sub-reflective films 1120 facing each other can be reduced, that is, the thickness of the cavity can be reduced, which is beneficial to the light guide device to be light and thin.

The light conversion portion 200 shown in fig. 9 may have the same features as the light conversion portion 200 shown in fig. 7, and will not be described again.

The second light guide element in the embodiments of the present disclosure may have the same features as the second light guide element shown in fig. 6 to 8, and is not described herein again.

For example, fig. 10 is a schematic partial cross-sectional structure diagram of a display device provided according to an embodiment of the present disclosure. Fig. 10 schematically shows that the display device includes the light guide device shown in fig. 8, but is not limited thereto, and the display device may include the light guide device provided in any of the above examples, for example, as shown in fig. 10, the display device includes a light source part 500, and light emitted from the light source part 500 is configured to enter the light guide device.

For example, the light source part 500 may include a light source 510 and a reflective light guide structure 520, the reflective light guide structure 520 being configured to adjust light emitted from the light source 510 to a predetermined divergence angle. For example, the predetermined divergence angle may include a divergence angle within 40 °. For example, the predetermined divergence angle may include a divergence angle within 20 °. For example, the light guide structure 520 may be a light cup, which may be a solid light cup or a hollow light cup, and converts light emitted from a light source with a certain divergence angle into collimated or nearly collimated light. For example, the collimated light is parallel or nearly parallel (e.g., divergence angle is not greater than 10 °), which has better consistency and can improve the utilization rate of light.

For example, the divergence angle of light rays emitted by the light source is generally large, e.g., 45, and the reflective light directing structure 520 may control the divergence angle of light rays to a small divergence angle, e.g., 40, 20, or 10. For example, the light has a divergence angle within 20 °, and the uniformity of the light with a certain divergence angle is increased along with multiple reflections in the propagation, so that the brightness uniformity of the light can be improved.

For example, the light source device provided by the embodiment of the disclosure can be used for a backlight of a display device.

For example, the light source 510 may be a monochromatic light source or a color-mixed light source, such as a red monochromatic light source, a green monochromatic light source, a blue monochromatic light source, or a white color-mixed light source, or may be a plurality of monochromatic light sources of different colors combined to form a color-mixed light source, which may ultimately form a monochromatic image, and which may form a color image. For example, the light source 510 may be a laser light source or a Light Emitting Diode (LED) light source. For example, the light source part 500 may include one light source 510 or a plurality of light sources 510.

For example, as shown in fig. 10, the display device further includes a display panel 600.

For example, as shown in fig. 10, the display panel 600 includes a display surface 601 and a back side 602 opposite to the display surface 601, and the light source device is located on the back side 602 of the display panel 600. For example, the light emitted from the light source device is transmitted through the display panel 600 and then emitted to the observation area. For example, a side of the display panel 600 facing the light source device is a non-display side, a side of the display panel 600 away from the light source device is a display side, and the viewing zone is located on the display side of the display panel 600, which is a side where a user can view a display image. For example, the viewing area and the light source device are located at both sides of the display panel 600.

For example, the display panel may be a liquid crystal display panel. The liquid crystal display panel may include an array substrate, an opposite substrate, a liquid crystal layer between the array substrate and the opposite substrate, and a sealant encapsulating the liquid crystal layer. For example, the liquid crystal display panel further includes a first polarizing layer disposed on a side of the array substrate away from the opposite substrate and a second polarizing layer disposed on a side of the opposite substrate away from the array substrate. For example, the light source device is configured to provide a backlight to the liquid crystal display panel, and the backlight is converted into image light after passing through the liquid crystal display panel.

For example, the polarizing axis direction of the first polarizing layer and the polarizing axis direction of the second polarizing layer are perpendicular to each other, but not limited thereto. For example, the first polarization layer can pass through one linearly polarized light, the second polarization layer can pass through the other linearly polarized light, and the polarization directions of the two linearly polarized light are vertical.

For example, only light of a specific polarization state may pass through the first polarization layer between the liquid crystal layer and the light source device to be incident into the liquid crystal display panel and be imaged. For example, the light emitted by the light source device provided by the embodiment of the disclosure is linearly polarized light, and the polarization direction of the linearly polarized light is parallel to the polarization axis of the first polarization layer, so that the light emitted by the light source device to the display panel has a high utilization rate.

For example, as shown in fig. 10, in the second light guide element 120, the reflectivity of one transflective element 0110 located at the edge of the light incident side is greater than the transmittance. For example, the reflectivity of the transflective element may be 100% or close to 100%, so as to reflect most or even all of the light to the transflective element adjacent to the transflective element, so that the other transflective element far away from the transflective element couples out the light, which can not only prevent the edge of the display panel from being too bright, but also prevent the transflective element from having a certain transmittance, so that the transmitted light has a certain divergence angle, and the divergent light leaks from the edge of the transflective element to overlap with the normally coupled-out light, thereby causing bright stripes.

For example, as shown in fig. 10, at least a portion of the above-mentioned one of the most peripheral transflective elements 0110 does not overlap with the display panel 600 in a direction perpendicular to the display surface of the display panel 600; alternatively, the area of the display panel 600 that overlaps the above-mentioned one of the most peripheral transflective elements 0110 is not used for imaging.

For example, as shown in fig. 10, the display device further includes at least one light diffusing element 710 located at least one of a side and a back side of the display surface of the display panel 600 and configured to diffuse light emitted from at least one of the display panel 600 and the light source device.

For example, fig. 10 schematically shows that the light diffusing element 710 is located at the back side of the display panel 600, i.e., between the display panel 600 and the light source device, and is configured to diffuse light emitted from the light source device, i.e., the light diffusing element 710 is configured to diffuse light beams passing through the light diffusing element 710.

For example, the light diffusing element 710 may also be disposed on the light emitting side of the display panel 600, and configured to diffuse the image light emitted from the display panel 600, and the light diffusing element 710 is disposed close to the display panel 600, for example, to improve the imaging effect.

For example, the light diffusing element 710 is configured to diffuse a light beam passing through the light diffusing element 710 but does not change or hardly changes the optical axis of the light beam. The "optical axis" refers to the center line of the light beam and may also be considered to be the main direction of propagation of the light beam.

For example, the light diffusing element 710 includes at least one of a diffractive optical element and a scattering optical element.

For example, the light diffusing element 710 may be a low-cost scattering optical element, such as a light homogenizing sheet, a diffusing sheet, etc., and the light beam may be scattered and may be slightly diffracted when passing through the scattering optical element, such as the light homogenizing sheet, etc., but the scattering mainly plays a role, and the light beam may form a large light spot after passing through the scattering optical element.

For example, the light diffusing element 710 may be a Diffractive Optical Element (DOE) that controls the diffusion effect relatively more precisely, such as a Beam Shaper (Beam Shaper). For example, the diffractive optical element can play a role in expanding light mainly through diffraction by designing a specific microstructure on the surface, and the size and the shape of a light spot can be controlled.

For example, as shown in fig. 10, the display device further includes a light converging element 720 located between the light source device and the display panel 600 and configured to converge the light emitted from the light source device and then direct the converged light to the at least one light diffusing element 710.

For example, as shown in fig. 10, the light converging element 720 is configured to perform direction control on the collimated light emitted from the light source device, so as to converge the light to a predetermined range, and further converge the light, thereby improving the utilization rate of the light. The predetermined range may be a point, such as a focal point of the convex lens, or a smaller region, and the light converging element is disposed to uniformly adjust the direction of the light (e.g., collimated light) output by the light guide element to the predetermined range, thereby improving the utilization rate of the light.

For example, the light converging element 720 may be a lens, a prism, a curved mirror or a lens combination, such as a fresnel lens and/or a curved lens, such as a convex lens, a concave lens or a lens combination, and the convex lens is schematically illustrated in fig. 10.

For example, as shown in fig. 10, in the embodiment of the present disclosure, the light converging element 720 may collect and orient almost all light rays, so that the light rays can reach the viewing area 001 of the user, and therefore the collimated light beam output by the light source device is easy to control to realize convenient adjustment of the direction of the light rays. For example, the area where the observer needs to view the image, for example, the viewing area 001, may be preset according to actual requirements, where the viewing area 001 refers to an area where the eyes of the observer are located and can see the image displayed by the display device, for example, the viewing area 001 may be a planar area or a stereoscopic area, and the eyes of the user can see the image, for example, a complete image, in the viewing area 001. For example, the viewing area 001 may be considered as an eyebox area (eyebox) of the display device.

Fig. 11 is a schematic partial cross-sectional view of a head-up display according to an embodiment of the disclosure. As shown in fig. 11, the head-up display includes a reflective imaging section 800 and the display device shown in fig. 10. Fig. 11 schematically illustrates a display device in the head-up display as the display device illustrated in fig. 10, but is not limited thereto. For example, as shown in fig. 11, the reflective imaging section 800 is configured to reflect light emitted from the display device to a viewing area 003 of the head-up display (which may be an eye-box area 003 of the head-up display, for example).

For example, as shown in fig. 11, the reflective imaging section 800 is configured to reflect light emitted from the display device to the eye box region 003 and transmit ambient light. The user positioned in the eye box region 003 can view the image 002 formed by the display device reflected by the reflective imaging section 800 and the scene of the environment positioned on the side of the reflective imaging section 800 away from the eye box region 003. For example, image light emitted from the display device is incident on the reflective imaging section 800, and light reflected by the reflective imaging section 800 is incident on a user, for example, the eye box region 003 where both eyes of the driver are located, so that the user can observe a virtual image formed outside the reflective imaging section, for example, without affecting the observation of the external environment by the user.

For example, the eye box region 003 is a planar region where both eyes of the user are located and an image displayed on the head-up display can be viewed. For example, when the eyes of the user are deviated from the center of the eye-box region by a certain distance, such as up and down, left and right, the eyes of the user still stay in the eye-box region, and the user can still see the image displayed on the head-up display.

For example, as shown in fig. 11, the reflective imaging portion 800 may be a Windshield (e.g., windshield) or an imaging window of a motor vehicle, corresponding to a windshields head-up display (Windshield-HUD, W-HUD) and a combination head-up display (combination-HUD, C-HUD), respectively.

For example, as shown in fig. 11, the reflective imaging section 800 may be a planar plate material, and forms a virtual image by specular reflection; and can also be a curved surface shape, such as a windshield or a transparent imaging plate with curvature, and the like, and can provide a longer imaging distance.

For example, the embodiment of the disclosure is not limited to the head-up display including the display device, and the head-up display may further include the light guide device shown in any one of fig. 1 to 9 and the reflective imaging portion, where the reflective imaging portion is configured to reflect the light emitted from the light guide device to the viewing area of the head-up display. Of course, the light emitted from the light guide device may be directly incident on the reflective imaging part without passing through any optical element or device, or the light emitted from the light guide device may be incident on the reflective imaging part after passing through other optical elements (such as a mirror, a lens, etc.) or other devices (such as a liquid crystal display panel).

The embodiment of the disclosure is not limited to the head-up display including the display device, and the head-up display may further include a light source device, and the reflective imaging part is configured to reflect light emitted from the light source device to a viewing area of the head-up display; the light source device comprises the light guide device and the light source part, wherein light rays emitted by the light source part enter the light guide device. Of course, the light emitted from the light source device may be directly incident on the reflective imaging part without passing through any optical element or device, or the light emitted from the light source device may be incident on the reflective imaging part after passing through other optical elements (such as a mirror, a lens, etc.) or other devices (such as a liquid crystal display panel).

Another embodiment of the present disclosure also provides a transportation device including the head-up display provided by at least one embodiment of the present disclosure. The front window (e.g., front windshield) of the traffic device is multiplexed as the reflective imaging portion 800 of the heads-up display. For example, the vehicle may be a variety of suitable vehicles, such as a land vehicle, which may include various types of automobiles, or a water vehicle, such as a boat, or an air vehicle, such as an airplane, that provides a windshield (e.g., at least one of a front windshield, a side windshield, and a rear windshield) and transmits an image onto the windshield via an in-vehicle display system.

The following points need to be explained:

(1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the same embodiment of the disclosure and of different embodiments may be combined with each other without conflict.

The above description is intended to be exemplary of the present disclosure, and not to limit the scope of the present disclosure, which is defined by the claims appended hereto.

Claims (20)

1. A light guide device comprising:

a plurality of transflective elements, at least some of the plurality of transflective elements configured to cause a portion of light rays propagating to the transflective elements to exit the light guide by one of reflection and transmission and another portion of light rays propagating to the transflective elements to continue propagating in the light guide by the other of reflection and transmission,

wherein the plurality of transflective elements comprises transflective elements provided with a reflective medium, at least part of the transflective elements are provided with a reflective medium having a first reflectivity, and of at least two of the at least part of the transflective elements, the area ratio of the reflective medium having the first reflectivity to the respective transflective elements is different such that the reflectivities of the at least two transflective elements are different; and/or the presence of a gas in the gas,

the plurality of transflective elements comprise transflective elements provided with reflective media, the reflective media provided by at least one of the transflective elements comprise at least two different reflectivities, and the number of types of reflectivities of the reflective media provided by the plurality of transflective elements is less than the number of the plurality of transflective elements.

2. A light guide device according to claim 1, wherein the plurality of transflective elements are arranged along a propagation direction of the light rays in the light guide device.

3. A light guide device according to claim 2, wherein the reflectivity of the plurality of transflective elements gradually increases or gradually increases regionally along the arrangement direction of the plurality of transflective elements.

4. A light guide device according to claim 3, wherein the plurality of transflective elements have the same area, and the reflective media provided by the same transflective element are reflective media having the same reflectivity.

5. A light guide device according to claim 4, wherein the reflective medium provided by each transflective element of the plurality of transflective elements is the reflective medium having the first reflectivity.

6. A light guide device according to claim 5, wherein the reflectivity of the transflective element is positively correlated with the area of the reflective medium in which it is disposed.

7. A light guide device according to claim 4, wherein the plurality of transflective elements comprises at least two transflective element groups, at least one of the transflective element groups comprises at least two transflective elements, and the reflective media disposed in the same transflective element group are reflective media having the same reflectivity, and the reflective media disposed in different transflective element groups are reflective media having different reflectivities.

8. A light guide device according to claim 7, wherein of at least two transflective elements provided with reflective media having different reflectances, the reflective media occupying the same area ratio of the respective transflective elements.

9. A light guide device according to claim 7, wherein in a transflective element group comprising at least two transflective elements, the reflectivity of the transflective element is positively correlated with the area of the reflective medium in which it is disposed.

10. A light guide device according to claim 3, wherein the reflective medium of at least one transflective element arrangement comprises at least two reflective media with different reflectivities.

11. A light guide device according to claim 10, wherein the reflective medium provided in each of the at least two transflective elements includes at least two reflective media having different reflectivities, and one of the reflective media having the first reflectivity in different transflective elements has a different area ratio to the corresponding transflective element so that the reflectivities of the different transflective elements are different.

12. A light guide device according to claim 10, wherein the reflective medium provided by each of the at least two transflective elements comprises at least two reflective media having different reflectivities, the reflectivities of different transflective elements being different;

the area ratio of the reflective medium to the surface of the respective transflective elements is the same in different transflective elements, or the area ratio of the reflective medium to the surface of the respective transflective elements is different in different transflective elements.

13. A light-guide apparatus as claimed in any of claims 1-12 wherein part of the transflective element further comprises a clear area comprising an area of the transflective element where the reflective medium is not provided.

14. A light guide device according to any of claims 1-12, wherein the reflective medium in each of the portions of the transflective elements is uniformly distributed.

15. A light-guide apparatus as claimed in any one of claims 1-12 further comprising:

a light guide medium configured to cause light entering the light guide medium to propagate with total reflection and/or non-total reflection.

16. A light-guide apparatus as claimed in any of claims 1 to 12 wherein the reflective medium of at least one transflective element arrangement comprises a layer of reflective film; alternatively, the reflective medium of at least one transflective element arrangement comprises a stack of multilayer reflective films comprising a plurality of tantalum pentoxide, titanium dioxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminium fluoride.

17. A light guide device according to any one of claims 1-12 wherein at least two of the at least partially transflective elements have different reflectivities due to different area ratios of the reflective medium having the same reflectivity to the respective transflective elements.

18. A light guide device comprising:

a plurality of transflective elements, at least a portion of the plurality of transflective elements configured to cause a portion of the light rays propagating to the transflective elements to exit the light guide by one of reflection and transmission and to cause another portion of the light rays propagating to the transflective elements to continue propagating in the light guide by the other of reflection and transmission,

wherein the plurality of transflective elements comprises transflective elements provided with transflective media, at least some of the transflective elements being provided with transflective media having a first transmissivity, and of at least two of the at least some of the transflective elements, the transflective media having the first transmissivity occupy different area ratios of the respective transflective elements to differentiate the transmissivity of the at least two transflective elements; alternatively, the first and second electrodes may be,

the plurality of transflective elements comprise transflective elements provided with transflective media, the transflective media provided by at least one of the transflective elements comprise at least two different transmittances, and the number of transmittance types of the transflective media provided by the plurality of transflective elements is smaller than the number of the plurality of transflective elements.

19. A light source device comprising:

a light source unit; and

a light guide device according to any one of claims 1 to 18, wherein light emitted from the light source unit enters the light guide device.

20. A heads-up display comprising:

a display device; and

a reflective imaging section configured to reflect light emitted from the display device to a viewing area of the head-up display, wherein the display device includes a display panel and the light source device of claim 19; alternatively, the first and second electrodes may be,

the head-up display includes:

the light guide apparatus of any one of claims 1-18 and a reflective imaging section, wherein the reflective imaging section is configured to reflect light exiting the light guide apparatus to a viewing area of the heads-up display; alternatively, the first and second electrodes may be,

the head-up display includes:

the light source device of claim 19 and a reflective imaging section, wherein the reflective imaging section is configured to reflect light rays exiting the light source device to a viewing area of the heads-up display.

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