Display device, light source device, head-up display, and traffic device

Abstract

A display device, a light source device, a head-up display, and a traffic device are disclosed. The display device includes a beam splitter, a light guide structure, and a light adjustment unit. The beam splitter is configured to split light into a first portion of light and a second portion of light. The light guide structure includes a first light-emitting region and a second light-emitting region. The light guide structure causes light corresponding to the first portion of light to exit from the first light-emitting region and light corresponding to the second portion of light to exit from the second light-emitting region. The light emitted from both the first and second light-emitting regions of the light guide structure includes a first wavelength and a second wavelength, wherein the energy distribution of the first wavelength light in the first and second light-emitting regions is different, and / or, the energy distribution of the second wavelength light in the first and second light-emitting regions is different. The light adjustment unit is configured to adjust the energy distribution of at least one of the first and second wavelength light in the display device to improve color shift.

Description

Technical Field

[0001] At least one embodiment of this disclosure relates to a display device, a light source device, a head-up display, and a transportation device. Background Technology

[0002] Head-up display (HUD) technology uses reflective optical design to project image light (including vehicle information such as vehicle speed) emitted from an image source (such as a display device) onto an imaging panel or a windshield of the car, so that the driver can see the information directly without looking down at the instrument panel while driving, which can improve driving safety and bring a better driving experience. Summary of the Invention

[0003] This disclosure provides a display device, a light source device, a head-up display, and a transportation device.

[0004] In a first aspect, at least one embodiment of this disclosure provides a light source device, comprising: a light source unit, a polarizing beam splitter, and a light guide structure. Light emitted from the light source unit is incident on the polarizing beam splitter, which is configured to split the incident light into a first portion of light and a second portion of light with different properties. The light guide structure includes a first light-emitting region and a second light-emitting region that do not completely overlap in a direction perpendicular to its extension direction. The emission direction of the light emitted from the light source unit is different from the emission direction of the light emitted from the first and second light-emitting regions. The light guide structure is configured to cause the light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting region, and to cause the light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting region. The first portion of light and the second portion of light obtained after the polarizing beam splitter are respectively first polarized light and second polarized light with different polarization states. The light source device further includes a polarization conversion structure configured to convert the second polarized light into third polarized light, wherein the third polarized light has the same polarization state as the first polarized light.

[0005] For example, in some embodiments, the light emitted from the first light-emitting area and the second light-emitting area of ​​the light guide structure both include a first wavelength light and a second wavelength light, and the energy distribution of the first wavelength light in the first light-emitting area and the second light-emitting area is different, and / or the energy distribution of the second wavelength light in the first light-emitting area and the second light-emitting area is different.

[0006] For example, in some embodiments, the light emitted from the first light-emitting area and the second light-emitting area of ​​the light guide structure both include a first wavelength light and a second wavelength light, the energy distribution of the first wavelength light emitted from the first light-emitting area is greater than the energy distribution of the second wavelength light emitted from the first light-emitting area, and the energy distribution of the first wavelength light emitted from the second light-emitting area is less than the energy distribution of the second wavelength light emitted from the second light-emitting area.

[0007] For example, in some embodiments, the light source device is a light source device for a display device.

[0008] For example, in some embodiments, the light source device is a backlight device for a display device.

[0009] Secondly, at least one embodiment of this disclosure provides a display device, comprising: a beam splitter configured to split light incident on the beam splitter into a first portion of light and a second portion of light with different properties; and a light guide structure, the light guide structure including at least a first light-emitting region and a second light-emitting region that do not completely overlap in a direction perpendicular to its extension direction; wherein the light guide structure is configured to cause light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting region, and to cause light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting region; light from the light guide structure... The light emitted from the first light-emitting area and the second light-emitting area both include a first wavelength light and a second wavelength light. The energy distribution of the first wavelength light in the first light-emitting area and the second light-emitting area is different, and / or the energy distribution of the second wavelength light in the first light-emitting area and the second light-emitting area is different. The display device further includes a light adjustment unit, which is configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in at least one of the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area before they are emitted from the display device.

[0010] Thirdly, at least one embodiment of this disclosure provides a display device, comprising: a beam splitter configured to split light incident on the beam splitter into a first portion of light and a second portion of light with different properties; and a light guide structure, the light guide structure including at least a first light-emitting region and a second light-emitting region that do not completely overlap in a direction perpendicular to its extension direction, the light guide structure being configured to cause light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting region as first emitted light, and to cause light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting region as second emitted light; the display device further includes a light adjustment unit configured to adjust the energy distribution of at least one of the emitted light in the display device corresponding to the light from the first light-emitting region and the second light-emitting region before exiting the display device.

[0011] For example, the light emitted from the first light-emitting area and the second light-emitting area of ​​the light guide structure both include a first wavelength light and a second wavelength light. The energy ratio of the first wavelength light emitted from the first light-emitting area is greater than the energy ratio of the second wavelength light emitted from the first light-emitting area, and the energy ratio of the first wavelength light emitted from the second light-emitting area is less than the energy ratio of the second wavelength light emitted from the second light-emitting area.

[0012] For example, based on any of the second or third aspects of the present disclosure, the light adjustment unit is configured to adjust the energy distribution of light corresponding to at least one of the emitted light from the first light-emitting area and the second light-emitting area in the display device.

[0013] For example, based on any of the first, second, or third embodiments of the present disclosure, the light adjustment unit is configured to adjust the light corresponding to the first emitted light and the light corresponding to the second emitted light so that the energy distribution relationship between the third emitted light and the fourth emitted light emitted from the first display area and the second display area of ​​the display device is the same, and the first display area and the second display area correspond to the first light-emitting area and the second light-emitting area, respectively.

[0014] For example, based on any of the first, second, or third embodiments of this disclosure, the first emission wavelength range of the first emitted light emitted from the first emission region is 400nm-800nm; and / or, the second emission wavelength range of the second emitted light emitted from the second emission region is 400nm-800nm.

[0015] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the first emission wavelength range of the first emitted light emitted from the first emission region is 400nm-480nm, 500nm-570nm, and 590nm-690nm; and / or, the second emission wavelength range of the second emitted light emitted from the second emission region is 400nm-480nm, 500nm-570nm, and 590nm-690nm.

[0016] For example, based on any of the first, second, or third embodiments of this disclosure, the first wavelength range of the first wavelength light in the first emitted light is 400nm-460nm, and / or the second wavelength range of the second wavelength light in the second emitted light is 460-800nm.

[0017] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the wavelength range of the first display light emitted from the first display area is 400nm-480nm, 500nm-570nm, and 590nm-690nm; and / or, the wavelength range of the second display light emitted from the second display area is 400nm-480nm, 500nm-570nm, and 590nm-690nm.

[0018] For example, based on any embodiment of the second or third aspect of this disclosure, the display device further includes: a light source unit and a display panel. Light emitted from the light source unit is incident on the beam splitter; light emitted from the light guide structure is incident on the display panel. The display panel includes a first display area corresponding to the first light-emitting area and a second display area corresponding to the second light-emitting area. The light adjustment unit includes a control sub-unit configured to determine the positions of the first display area and the second display area based on the positions of the first light-emitting area and the second light-emitting area, and to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area before it is emitted from the display device.

[0019] For example, based on any of the first, second, or third embodiments of this disclosure, the display panel includes a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate. The light adjustment unit further includes liquid crystal molecules within the liquid crystal layer. The control sub-unit is configured to adjust the rotation angle of the liquid crystal molecules corresponding to the first display area and the second display area to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area before being emitted from the display device.

[0020] For example, based on any of the first, second, or third embodiments of this disclosure, the light adjustment unit includes a first color filter layer and a second color filter layer, wherein the first color filter layer is configured to transmit at least the first wavelength light, and the second color filter layer is configured to transmit at least the second wavelength light; the transmittance of the first color filter layer corresponding to the first light-emitting region is lower than the transmittance of the second color filter layer; and the transmittance of the first color filter layer corresponding to the second light-emitting region is higher than the transmittance of the second color filter layer.

[0021] For example, based on any of the first, second, or third aspects of the present disclosure, the display device further includes a reflective element configured to reflect light corresponding to the first portion of light or light corresponding to the second portion of light.

[0022] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the beam splitter includes a polarization beam splitter, wherein the first portion of light and the second portion of light obtained after polarization beam splitting by the polarization beam splitter are respectively first polarized light and second polarized light with different polarization states, and the polarization beam splitter is configured to have a reflectivity for one of the first polarized light and the second polarized light greater than its reflectivity for the other; and / or, the polarization beam splitter is configured to have a transmittance for one of the first polarized light and the second polarized light greater than its transmittance for the other; the display device further includes a polarization conversion structure configured to convert the light corresponding to the second polarized light into third polarized light, wherein the third polarized light has the same polarization state as the first polarized light.

[0023] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the light guide structure includes an optical coupling section.

[0024] For example, the optical output section includes a first optical output section and a second optical output section. The first optical output section is configured to couple the light corresponding to the first portion of light out from the first light output area, and the second optical output section is configured to couple the light corresponding to the second portion of light out from the second light output area.

[0025] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the light output portion includes a transflective element array, the transflective element array including a plurality of transflective elements, at least some of the transflective elements in the transflective element array being configured to partially reflect and partially transmit light propagating to the transflective elements, so that a portion of the light is coupled out of the light guide structure and another portion continues to propagate in the light guide structure; or, the light output portion includes at least one of a volume grating, a blazed grating, a prism, and light-emitting dots.

[0026] For example, based on any of the first, second, or third embodiments of this disclosure, the light converted by the polarization conversion structure propagates toward the second optical coupler, and the third polarized light obtained by converting the light corresponding to the second polarized light by the polarization conversion structure is emitted from the second light-emitting region; or, the light emitted from the second optical coupler propagates toward the polarization conversion structure, and the light corresponding to the second polarized light is converted into the third polarized light by the polarization conversion structure and emitted from the second light-emitting region; or, the light converted by the polarization conversion structure propagates toward the light guide structure, the third polarized light converted by the polarization conversion structure is incident on the light guide structure, and the third polarized light is emitted from the second light-emitting region; or, the polarization conversion structure is located within the light guide structure, the light corresponding to the second polarized light propagates in the light guide structure to the polarization conversion structure and is converted into the third polarized light, and the third polarized light is emitted from the second light-emitting region.

[0027] For example, based on any of the first, second, or third embodiments of this disclosure, the light guide structure includes a first light guide element and a second light guide element. The light corresponding to the first portion of light is incident on the first light guide element, and the first light guide element includes a first light coupling portion. The light corresponding to the second portion of light is incident on the second light guide element, and the second light guide element includes a second light coupling portion. The first light coupling portion and the second light coupling portion do not completely overlap in a direction perpendicular to the extension direction of the light guide structure. Alternatively, the light guide structure includes a third light guide element and a fourth light guide element. The third light guide element includes a first light coupling portion and a second light coupling portion. The first light coupling portion and the second light coupling portion do not overlap in a direction perpendicular to the extension direction of the light guide structure. The light corresponding to the first portion of light is incident on the third light guide element and coupled out by the first light coupling portion. The light corresponding to the second portion of light is incident on the fourth light guide element and propagates from the fourth light guide element to the third light guide element, and is coupled out by the second light coupling portion.

[0028] For example, based on any of the first, second, or third embodiments of this disclosure, the light guide structure further includes a light guide medium configured to allow light entering the light guide medium to propagate by total internal reflection and / or non-total internal reflection, and the light coupling portion is configured to couple the light propagating in the light guide medium to a predetermined area.

[0029] For example, based on any of the first, second, or third embodiments of this disclosure, at least a portion of the second light-emitting region is located on one side of the first light-emitting region in the extension direction parallel to the light guide structure; or, at least a portion of the first light-emitting region is located on one side of the second light-emitting region in the extension direction parallel to the light guide structure.

[0030] For example, based on any of the first, second, or third embodiments of this disclosure, the divergence angle of at least one of the light corresponding to the first portion of light and the light corresponding to the second portion of light is θ, and the range of θ includes 0 to 20 degrees.

[0031] For example, based on any of the first, second, or third aspects of the present disclosure, the display device further includes a light-diffusing section, which is configured to reflect light incident on the light-diffusing section at least once so that the light propagates to at least one of the first light-coupled section and the second light-coupled section.

[0032] For example, based on any of the first, second, or third embodiments of this disclosure, the beam splitter includes a polarization beam splitter, the polarization beam splitter includes a polarization transflection film, the polarization conversion structure includes a phase retardation film, and at least one of the materials of the polarization transflection film and the phase retardation film includes a polymer material.

[0033] For example, based on any of the first, second, or third embodiments of this disclosure, the light source includes a light-emitting chip and phosphor located on the light-emitting side of the light-emitting chip.

[0034] For example, based on any of the first, second, or third embodiments of this disclosure, the light source includes a blue light-emitting chip and a yellow phosphor located on the light-emitting side of the light-emitting chip.

[0035] For example, based on any of the embodiments of the first, second, or third aspects of this disclosure, the light source includes at least two light-emitting devices that emit light of different wavelengths.

[0036] For example, based on any of the first, second, or third embodiments of this disclosure, the wavelength range of the light emitted by the light source is 400nm-460nm, and / or the wavelength range of the light emitted by the light source is 400nm-480nm, 500nm-570nm, and 590nm-690nm.

[0037] At least one embodiment of this disclosure provides a head-up display, including: any of the above-described display devices or light source devices; and a reflective imaging unit configured to reflect light emitted from the display device to the observation area of ​​the head-up display.

[0038] At least one embodiment of this disclosure provides a transportation device, including the above-described display device, light source device, or head-up display. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0040] Figure 1 This is a schematic diagram of a display device provided according to an embodiment of the present disclosure;

[0041] Figure 2A This is a partial structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

[0042] Figure 2B This is a partial structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

[0043] Figure 2C This is a partial structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

[0044] Figure 3 This is a partial structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

[0045] Figure 4 This is a partial structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure;

[0046] Figure 5A This is a partial cross-sectional structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

[0047] Figure 5B For along Figure 5A A schematic diagram of the cross-sectional structure of the first light guide element cut by line AA' shown;

[0048] Figure 5C For along Figure 5A A schematic diagram of the cross-sectional structure of the second light guide element cut by the BB' line shown;

[0049] Figure 6 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure;

[0050] Figure 7 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure;

[0051] Figure 8A schematic diagram of a light guide structure and a beam splitter element in a display device provided as another example of an embodiment of this disclosure;

[0052] Figure 9 A schematic diagram of a light guide structure, beam splitter, reflector, and polarization conversion structure in a display device provided as another example of an embodiment of this disclosure;

[0053] Figure 10 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure;

[0054] Figure 11 This is a partial structural schematic diagram of a light source device according to another embodiment of the present disclosure;

[0055] Figure 12 A partial cross-sectional structural diagram of a head-up display provided according to an embodiment of this disclosure; and

[0056] Figure 13 This is an exemplary block diagram of a transportation device provided according to another embodiment of the present disclosure. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0058] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. For clarity, elements in the accompanying drawings used to describe embodiments of this disclosure are enlarged or reduced; that is, these drawings do not limit the actual scale. The term “at least one” as used in this disclosure means “one or more,” and the term “multiple” as used in this disclosure means “at least two,” that is, “two or more.”

[0059] This disclosure provides a display device, a light source device, a head-up display, and a traffic device. The display device includes a beam splitter, a light guide structure, and a light adjustment unit. The beam splitter is configured to split incident light into a first portion of light and a second portion of light with different properties. The light guide structure includes at least a first light-emitting region and a second light-emitting region that do not completely overlap in a direction perpendicular to its extension direction. The light guide structure is configured to allow light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting region, and to allow light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting region. The light emitted from the first and second light-emitting regions of the light guide structure both include a first wavelength light and a second wavelength light. The first wavelength light has different energy distributions in the first and second light-emitting regions, and / or the second wavelength light has different energy distributions in the first and second light-emitting regions. The display device further includes a light adjustment unit configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in at least one of the light corresponding to the light emitted from the first and second light-emitting regions before exiting the display device. The display device provided in this disclosure improves the color shift phenomenon by setting a light adjustment unit to adjust the energy distribution of light emitted from different display areas.

[0060] For example, the display device includes: a beam splitter configured to split light incident on the beam splitter into a first portion of light and a second portion of light with different properties; and a light guide structure including at least a first light-emitting region and a second light-emitting region that do not completely overlap in a direction perpendicular to its extension direction, the light guide structure being configured to cause light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting region as first emitted light, and to cause light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting region as second emitted light; the light emitted from the first light-emitting region and the second light-emitting region of the light guide structure both include a first wavelength light and a second wavelength light, the energy proportion of the first wavelength light emitted from the first light-emitting region is greater than the energy proportion of the second wavelength light emitted from the first light-emitting region, and the energy proportion of the first wavelength light emitted from the second light-emitting region is less than the energy proportion of the second wavelength light emitted from the second light-emitting region; the display device further includes a light adjustment unit configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light among at least one of the light corresponding to the emitted light from the first light-emitting region and the second light-emitting region before exiting the display device.

[0061] The display device, light source device, head-up display, and traffic equipment provided in the embodiments of this disclosure will now be described with reference to the accompanying drawings. It should be noted that the same components can be arranged in the same way. All embodiments of this disclosure are applicable to multiple protection subjects such as display devices, light source devices, head-up displays, and traffic equipment. The same or similar content will not be repeated in each protection subject; reference can be made to the descriptions in the embodiments corresponding to other protection subjects.

[0062] Figure 1 This is a schematic diagram of a display device provided according to an embodiment of the present disclosure. Figure 1 As shown, the display device includes a beam splitter 100 and a light guide structure 200. The beam splitter 100 is configured to split incident light into a first portion of light 01 and a second portion of light 02 with different properties. The light guide structure 200 includes at least a first light-emitting region 201 and a second light-emitting region 202 that do not completely overlap in a direction perpendicular to its extension direction. The light guide structure 200 is configured to allow light corresponding to the first portion of light 01 incident on the light guide structure 200 to exit from the first light-emitting region 201, and to allow light corresponding to the second portion of light 02 incident on the light guide structure 200 to exit from the second light-emitting region 202.

[0063] For example, the light incident on the beam splitter 100 is a mixture of light including a first part O1 and a second part O2. The beam splitter 100 can split the first part O1 and the second part O2 of the mixture into two parts of light, causing these two parts of light to propagate in different directions. For example, the light incident on the beam splitter 100 can be decomposed into two types of light with different characteristics, such as decomposing into a first part of light and O1 and a second part of light O2, causing these two parts of light to propagate in different directions. The aforementioned "light corresponding to the first portion of light 01 incident on the light guide structure 200" and "light corresponding to the second portion of light 02 incident on the light guide structure" refer to the first portion of light 01 and the second portion of light 02 after being split by the beam splitter 100, respectively. Regardless of whether these two portions of light undergo changes in characteristics (e.g., changes in polarization characteristics) before being incident on the light guide structure or during propagation within the light guide structure, the light emitted from the first light-emitting region 201 of the light guide structure 200 is the light from the first portion of light 01 obtained after being split by the beam splitter 100, transmitted through some optical elements, and the light emitted from the second light-emitting region 202 of the light guide structure 200 is the light from the second portion of light 02 obtained after being split by the beam splitter 100, transmitted through some optical elements. Both can be considered as the light corresponding to the first portion of light 01 and the second portion of light 02. In this embodiment, the first portion of light 01 is schematically represented by a solid arrow and the second portion of light 02 by a dashed arrow, to schematically distinguish between the first portion of light 01 and the second portion of light 02. For example, the light corresponding to the first part of light mentioned above may include the first part of light that has not been processed by the optical element or the first part of light that has been processed by other optical elements; the light corresponding to the second part of light mentioned above may include the second part of light that has not been processed by the optical element or the second part of light that has been processed by other optical elements.

[0064] For example, such as Figure 1 As shown, the light guide structure 200 extends along the X direction. The extension direction of the light guide structure 200 can guide the extension direction of a certain side (e.g., the long side) of the light structure 200. The direction perpendicular to its extension direction can refer to the Y direction in the figure. For example, the "direction perpendicular to the XY plane" can guide the direction of the wide side of the light structure 200, and the long side and the wide side can form a rectangle. For example, the light guide structure 200 may include at least one light guide element, which includes a plate-like structure with a certain thickness in the Y direction and a rectangular shape in the plane perpendicular to the XY plane, as shown in the figure. Figure 1 The diagram schematically shows that the first light-emitting region 201 and the second light-emitting region 202 do not overlap in the Y direction, and that the first light-emitting region 201 and the second light-emitting region 202 are connected. However, this is not the only possibility. For example, the first light-emitting region and the second light-emitting region may partially overlap in the Y direction. When the first light-emitting region and the second light-emitting region partially overlap, the light emitted from the overlapping portion includes a mixture of the first portion of light 01 and the second portion of light 02. For example, as... Figure 1 As shown, the first light-emitting region 201 and the second light-emitting region 202 do not completely overlap in the light-emitting direction of the light guide structure 200. For example, the first light-emitting region and the second light-emitting region not completely overlapping means that the first light-emitting region includes a portion that does not overlap with the second light-emitting region, or the second light-emitting region includes a portion that does not overlap with the first light-emitting region.

[0065] Figure 1 The schematic diagram shows a light guide structure comprising two light-emitting areas (first light-emitting area 201 and second light-emitting area 202). However, it is not limited to this; the light guide structure may also include three, four, or more light-emitting areas. For example, when the light guide structure includes three or more light-emitting areas, any two adjacent light-emitting areas do not completely overlap in the Y direction.

[0066] For example, such as Figure 1 As shown, the light rays emitted from the first light-emitting area 201 and the second light-emitting area 202 are both emitted towards one side of the light guide structure 200, for example, both emitted in the direction indicated by the arrow in the Y direction. For example, the light rays emitted from the first light-emitting area 201 and the second light-emitting area 202 are both emitted from the same side of the light guide structure 200.

[0067] like Figure 1 As shown, the light emitted from the first light-emitting region 201 and the second light-emitting region 202 of the light guide structure 200 both include a first wavelength light and a second wavelength light. For example, the energy distribution of the first wavelength light in the first light-emitting region 201 and the second light-emitting region 202 is different, and / or, the energy distribution of the second wavelength light in the first light-emitting region 201 and the second light-emitting region 202 is different (e.g., different energy percentages). For example, the energy distribution (e.g., energy percentage) of the first wavelength light in the first light-emitting region 201 can be the ratio of the integral area of ​​the first wavelength light (e.g., its corresponding emission peak area) in the emission spectrum of the first light-emitting region 201 to the total integral area of ​​the emission spectrum of the first light-emitting region 201; for example, the energy distribution (e.g., energy percentage) of the second wavelength light in the second light-emitting region 202 can be the ratio of the integral area of ​​the second wavelength light (e.g., its corresponding emission peak area) in the emission spectrum of the second light-emitting region 202 to the total integral area of ​​the emission spectrum of the second light-emitting region 202. For example, energy distribution can also include intensity, color temperature, etc. For example, the intensity of light emitted by the first wavelength in the first emission region 201 and the second emission region 202 can be different.

[0068] For example, the intensity of the first wavelength light emitted from the first light-emitting region 201 is different from the intensity of the first wavelength light emitted from the second light-emitting region 202, and the intensity of the second wavelength light emitted from the first light-emitting region 201 is different from the intensity of the second wavelength light emitted from the second light-emitting region 202. For example, the aforementioned "intensity" can refer to the brightness, luminous flux, illuminance, or luminous intensity of the emitted light. For example, the color temperature of the first wavelength light may also be different in the first light-emitting region 201 and the second light-emitting region 202; for example, the color temperature of the light emitted from the first light-emitting region 201 and the second light-emitting region 202 may also be different.

[0069] For example, the intensity of the first wavelength light emitted from the first light-emitting region 201 is greater than the intensity of the second wavelength light, while the intensity of the first wavelength light emitted from the second light-emitting region 202 is less than the intensity of the second wavelength light. For example, the first portion of light 01 and the second portion of light 02 are different lights, for example, their wavelength distributions are not exactly the same; for example, the center wavelength of the first portion of light 01 is different from the center wavelength of the second portion of light 02. For example, the intensity (e.g., crest height / crest area) of the center wavelength of the first portion of light 01 is different from the intensity of the center wavelength of the second portion of light 02.

[0070] For example, the first wavelength light and the second wavelength light can be light of a single wavelength, or light including multiple wavelengths (e.g., including continuous or discontinuous bands). For example, one of the first wavelength light and the second wavelength light can include blue light, and the other of the first wavelength light and the second wavelength light can include red light and / or green light. For example, one of the first wavelength light and the second wavelength light can be blue light and / or green light, and the other can be red light. For example, the aforementioned red light, blue light, and green light are narrowband lights with a half-width at half-maximum of no more than 50 nm. For example, the peak wavelength of blue light is located in the range of 400 nm to 480 nm, the peak wavelength of green light is located in the range of 500 nm to 570 nm, and the peak wavelength of red light is located in the range of 590 nm to 690 nm.

[0071] It should be understood that the embodiments disclosed herein are not limited thereto. For example, one of the first wavelength light and the second wavelength light can be blue light (e.g., blue light with a wavelength distribution of 400nm to 460nm), and the other can be light with a wavelength greater than that of blue light (e.g., visible light with a wavelength greater than 460nm, such as 460nm to 800nm); or, one of the first wavelength light and the second wavelength light can be light with a wavelength less than that of green light (e.g., light with a wavelength distribution of 540nm to 580nm), and the other can be green light and light with a wavelength greater than that of green light (e.g., visible light with a wavelength greater than 580nm).

[0072] like Figure 1As shown, the display device also includes a light adjustment unit 300, configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to at least one of the emitted light from the two display areas corresponding to the first light-emitting area 201 and the second light-emitting area 202, respectively. For example, the "light corresponding to at least one of the emitted light from the two display areas" refers to the light emitted by the light source unit in the process of being converted into image light. For example, it can be the light emitted from the first light-emitting area (and / or the second light-emitting area) before it is emitted from the display device. For example, the energy distribution of at least one of the first wavelength light and the second wavelength light in at least one of the emitted light from the first light-emitting area (and / or the second light-emitting area) before it is emitted from the display device can be adjusted by using a liquid crystal layer or a color filter layer.

[0073] For example, the light adjustment unit 300 can increase or decrease the intensity of light passing through it. For instance, the light adjustment unit 300 can adjust the intensity of a first wavelength of light in the light corresponding to the light emitted from one display area, or adjust the energy distribution of the first and second wavelengths of light in the light corresponding to the light emitted from one display area, such as intensity / intensity ratio, or adjust the intensity of the first wavelength of light in the light corresponding to the light emitted from one display area and the energy distribution of the second wavelength of light in the light corresponding to the light emitted from another display area, such as energy ratio, intensity, color temperature, intensity ratio, etc. The embodiments disclosed herein are not limited to these, and adjustments can be made according to actual product requirements.

[0074] For example, the light adjustment unit is configured to adjust the light corresponding to the first emitted light and the light corresponding to the second emitted light, so that the energy distribution relationship between the third emitted light and the fourth emitted light emitted from the first display area and the second display area of ​​the display device is the same or has a small difference, and the first display area and the second display area correspond to the first light-emitting area and the second light-emitting area, respectively. For example, the above-mentioned sameness can be almost the same; for example, the third emitted light and the fourth emitted light can be image light. By adjusting the light corresponding to the first emitted light and the light corresponding to the second emitted light with different energy distributions (e.g., color shift exists) by the light adjustment unit, the image light has no or almost no color shift, thus improving the user experience.

[0075] In at least one embodiment of this disclosure, the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to at least one of the emitted light from the two display areas is adjusted by the light adjustment unit, and / or the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to at least one of the emitted light from the first light-emitting area and the second light-emitting area in the display device before being emitted from the display device is adjusted by the light adjustment unit, such as energy ratio, intensity, color temperature, intensity ratio, etc., which is beneficial to improve the color deviation phenomenon of the display device.

[0076] For example, Figure 2A , Figure 2B and Figure 2C This is a partial structural schematic diagram of a display device provided according to at least one example of an embodiment of the present disclosure. For example... Figure 2A , Figure 2B and Figure 2C As shown, the beam splitter 100 includes a polarization beam splitter 110. After polarization beam splitting, the first portion of light O1 and the second portion of light O2 obtained by the polarization beam splitter 110 are respectively first polarized light and second polarized light with different polarization states. The polarization beam splitter 110 is configured such that the reflectivity of one of the first polarized light and the second polarized light is greater than its reflectivity to the other; or, the polarization beam splitter 110 is configured such that the transmittance of one of the first polarized light and the second polarized light is greater than its transmittance to the other. The display device also includes a polarization conversion structure 120, configured to convert the second polarized light into a third polarized light, the third polarized light having the same polarization state as the first polarized light. For example, the polarization beam splitter 110 is configured such that the reflectivity of one of the first polarized light and the second polarized light is greater than its reflectivity to the other; and the polarization beam splitter 110 is configured such that the transmittance of one of the first polarized light and the second polarized light is greater than its transmittance to the other.

[0077] For example, the polarization beam splitter 110 includes a polarization transflection film, the polarization conversion structure 120 includes a phase retardation film, and at least one of the polarization transflection film and the phase retardation film is made of a polymer material.

[0078] For example, the polarization beam splitter 110 may include a transmissive-reflective film with transmissive and reflective properties, which achieves beam splitting by transmitting part of the light and reflecting another part of the light. For example, the polarization beam splitter 110 may be a polarization beam splitter (PBS), which may be in a three-dimensional form.

[0079] For example, the polarization beam splitter 110 includes a transmissive-reflective film that can be an optical film with polarization transmission and reflection functions. For instance, it can split unpolarized light into two mutually orthogonal polarized beams through transmission and reflection, or it can split the beam into two linearly polarized beams with mutually perpendicular polarization directions. For example, the aforementioned optical film can be composed of multiple layers with different refractive indices arranged in a specific stacking order, with each layer having a thickness of approximately 10–1000 nm. For example, at least one layer can be made of an inorganic dielectric material, such as metal oxides, inorganic fluorides, metal nitrides, and metal nitrides; or it can be made of a polymer material, such as polypropylene, polyvinyl chloride, or polyethylene.

[0080] For example, the polarization conversion structure 120 may include a quarter-wave plate or a half-wave plate.

[0081] The inventors of this disclosure have discovered that, for example, when at least one of the materials of the polarization beam splitter 110 and the polarization conversion structure 120 includes a polymer material, the relationship between the transmittance of the polymer material and the wavelength changes when the incident angle of the light incident on the polymer material is large (e.g., the incident angle is above 40°), compared to the case where the light is incident perpendicularly or nearly perpendicularly on the polymer material. For example, when the incident angle of the light incident on the polymer material is large, the transmittance of the polymer material to short-wavelength light (e.g., blue light) decreases, while the transmittance to long-wavelength light (e.g., red light) increases. Therefore, in the light beam split by the polarization beam splitter and / or the light whose polarization characteristics are converted by the polarization conversion structure, the proportion of long-wavelength light in the transmitted light increases, and / or the proportion of short-wavelength light in the reflected light increases. For example, the transmitted light will be yellowish (e.g., yellowish relative to white light), and the reflected light will be bluish (e.g., bluish relative to white light). As a result, the light emitted from at least one of the first and second light-emitting areas of the light guide structure is prone to color shift. By providing a light adjustment unit, the color shift of the light emitted from the display area of ​​the display device can be improved or eliminated.

[0082] For example, the polarization beam splitter 110 has a higher transmittance for first polarized light than for second polarized light, and a higher reflectance for second polarized light than for first polarized light. For example, the first and second polarized lights can be interchanged.

[0083] For example, the transmittance of the polarization beam splitter 110 to the first polarized light is about 20% to 95%, for example, the transmittance can be 60%, 70%, 80% or 90%.

[0084] For example, the reflectivity of the polarization beam splitter 110 to the second polarized light is about 20% to 95%, for example, the reflectivity can be 60%, 70%, 80% or 90%.

[0085] For example, both the first polarized light and the second polarized light can be linearly polarized light, but their polarization directions are different; for example, the polarization directions of the first polarized light and the second polarized light can be perpendicular.

[0086] For example, after unpolarized light passes through a polarization beam splitter 110 with 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. This disclosure does not limit the specific polarization. For example, one of the first polarized light and the second polarized light is S-polarized light, and the other is P-polarized light.

[0087] For example, the first polarized light and the second polarized light can both be circularly polarized light or elliptically polarized light, and the first polarized light and the second polarized light have different rotation directions.

[0088] For example, the first, second, and third polarized light can all be linearly polarized, with the polarization direction of the third polarized light being the same as that of the first polarized light. Alternatively, the first, second, and third polarized light can all be circularly polarized or elliptically polarized, with the rotation direction of the third polarized light being the same as that of the first polarized light. The phrase "the third polarized light and the first polarized light have the same polarization state" can refer to the fact that, without considering factors such as the conversion efficiency of the polarization conversion structure, they are essentially the same; for example, both are linearly polarized light with the same polarization direction, or circularly polarized or elliptically polarized light with the same rotation direction.

[0089] For example, Figure 2A The polarization conversion structure 120 is schematically shown to be located on the side of the transmitted light of the polarization beam splitter 110. In this case, the transmitted light of the polarization beam splitter 110 includes second polarized light, and the reflected light of the polarization beam splitter 110 includes first polarized light. However, it is not limited to this. The polarization conversion structure can also be located on the side of the reflected light of the polarization beam splitter. In this case, the transmitted light of the polarization beam splitter includes first polarized light, and the reflected light of the polarization beam splitter includes second polarized light.

[0090] For example, the second polarized light can be converted into the third polarized light only once by the polarization conversion structure 120. For example, the polarization conversion structure 120 can be a half-wave plate. Of course, the embodiments disclosed herein are not limited to this. The second polarized light can also be converted into the third polarized light by the polarization conversion structure 120 two or more times. For example, the polarization conversion structure 120 can be a quarter-wave plate.

[0091] For example, such as Figure 2A As shown, the display device also includes a reflective element 130, which is configured to reflect either a first portion of light or a second portion of light. For example, the light reflected by the reflective element 130 can directly enter the light guide structure 200, or it can enter the light guide structure 200 after passing through other optical elements. For example, the reflective element 130 can reflect light reflected by the beam splitter 100, or it can reflect light transmitted by the beam splitter 100. For example, the light reflected by the reflective element 130 can be at least one of the first polarized light, the second polarized light, and the third polarized light described above.

[0092] For example, the reflective element 130 may include a reflective surface, which may include a material with a high reflectivity (e.g., reflectivity greater than 60%, 70%, 80%, 90%, or 95%), reflecting at least one of the first polarized light, the second polarized light, and the third polarized light into the light guide structure 200 through specular reflection. For example, the reflective surface may be a metallic reflective surface, such as an aluminum-plated, silver-plated, or copper-plated reflective surface; or the reflective surface may also be an applied reflective film, such as an enhanced specular reflector (ESR).

[0093] For example, the reflecting element 130 may include a prism, and light incident on the reflecting element 130 may undergo total internal reflection on the surface (e.g., the inner surface) of the prism before being directed to the light guiding structure 200. For example, the prism may be a triangular prism structure.

[0094] For example, such as Figure 2A As shown, the light reflected by the polarization beam splitter 110 includes first polarized light. The reflective element 130 is located on one side of the reflected light of the polarization beam splitter 110 (for example, the reflective element 130 is located in the optical path of the reflected light of the polarization beam splitter 110) and is configured to reflect the first polarized light. The first polarized light can directly enter the light guide structure 200, or it can enter the light guide structure 200 after passing through other optical elements.

[0095] Of course, the embodiments disclosed herein are not limited to this. For example, the light reflected by the polarization beam splitter may include second polarized light. The reflecting element is located on one side of the light reflected by the polarization beam splitter and on the light-incident side of the polarization conversion structure, for example, between the polarization beam splitter and the polarization conversion structure. The reflecting element is configured to reflect the second polarized light, which is then converted into third polarized light by the polarization conversion structure. The third polarized light can directly enter the light guide structure, or it can enter the light guide structure after passing through other optical elements. For example, the light reflected by the polarization beam splitter may include light corresponding to the second polarized light. The reflecting element is located on the light-outcrystal side of the polarization conversion structure and is configured to reflect the third polarized light. The third polarized light can directly enter the light guide structure, or it can enter the light guide structure after passing through other optical elements. The light corresponding to the second polarized light may include second polarized light that has not been processed by optical elements or second polarized light that has been processed by other optical elements.

[0096] For example, the reflectivity of the polarization beam splitter 110 for first polarized light is greater than its reflectivity for second polarized light. When the first polarized light is incident on the reflector 130, a small amount of second polarized light may also be incident on the reflector 130. In this case, the reflector 130 may reflect both the first polarized light and a small amount of second polarized light. Similarly, when the polarization beam splitter reflects the second polarized light and transmits the first polarized light, the reflector may reflect both the second polarized light and a small amount of first polarized light; after the second polarized light is converted into third polarized light, the reflector may reflect both the third polarized light and a small amount of first polarized light.

[0097] For example, such as Figure 2A As shown, the display device also includes a light source unit 0300, and the light emitted from the light source unit 0300 is configured to be incident on the beam splitter 100. For example... Figure 2B and Figure 2C As shown, the light source unit 0300 can be set in different positions.

[0098] For example, the light source unit may include a light source and a reflective light guide structure, the reflective light guide structure being configured to adjust the light emitted by the light source to a predetermined divergence angle. For example, the predetermined divergence angle may include a divergence angle within 40°. For example, the light source unit may include a light-emitting chip and phosphor located on the light-emitting side of the light-emitting chip. For example, the light-emitting chip may be a light-emitting diode chip, and this embodiment includes, but is not limited to, this. For example, the light emitted by the light-emitting chip is blue light, and the phosphor is YAG (yttrium aluminum garnet) phosphor; the blue light emitted by the light-emitting chip excites the YAG phosphor to form white light. For example, the light emitted by the light-emitting chip is blue light, and the phosphor is RG phosphor; the blue light emitted by the light-emitting chip excites the RG phosphor to form white light. For example, the light-emitting chip may include a chip that emits blue light, a chip that emits green light, and a chip that emits red light, which are mixed to form white light. For example, the wavelength range of the light emitted by the light-emitting chip can be distributed throughout the entire visible light range, such as 400nm to 800nm, for example, it can be white light generated by blue light exciting phosphors; or, the wavelength range of the light emitted by the light-emitting chip can be a discontinuous band such as 400nm to 480nm, 500nm to 565nm, and 590nm to 690nm, for example, it can be white light composed of a combination of monochromatic LEDs emitting red, green, and blue light. For example, the light emitted by the light-emitting chip includes a first wavelength light and a second wavelength light.

[0099] For example, the first emitted light emitted from the first emitted region has a first emitted wavelength range of 400nm-800nm; and / or, the second emitted light emitted from the second emitted region has a second emitted wavelength range of 400nm-800nm.

[0100] For example, the first emission wavelength range of the first emitted light emitted from the first emission region is 400nm-480nm, 500nm-570nm, and 590nm-690nm; and / or, the second emission wavelength range of the second emitted light emitted from the second emission region is 400nm-480nm, 500nm-570nm, and 590nm-690nm.

[0101] For example, the first wavelength range of the first wavelength light in the first emitted light is 400nm-460nm, and / or the second wavelength range of the second wavelength light in the second emitted light is 460-800nm.

[0102] For example, based on any of the embodiments of the first, second, or third aspect of this disclosure, the wavelength range of the first display light emitted from the first display area is 400nm-480nm, 500nm-570nm, and 590nm-690nm; and / or, the wavelength range of the second display light emitted from the second display area is 400nm-480nm, 500nm-570nm, and 590nm-690nm. For example, the first display light / second display light can be image light.

[0103] For example, the reflective light guide structure can be a lamp cup, which can be a solid lamp cup or a hollow lamp cup. It can convert light emitted by the light source with a certain divergence angle into collimated light. For example, the collimated light is parallel or nearly parallel light (e.g., divergence angle not greater than 10°), which has good consistency and can improve the light utilization rate. The polarization conversion efficiency of the collimated light is also higher.

[0104] For example, reflective light guide structures can control the divergence angle of light to a smaller angle. Light emitted from a light source typically has a large divergence angle, such as 45°, but reflective light guide structures can control this angle to 40°, 20°, or 10°. For instance, light with a divergence angle within 20° will have increased uniformity due to multiple reflections during propagation, thus improving the uniformity of light intensity.

[0105] For example, Figure 3 This is a partial structural schematic diagram of a display device provided according to an example embodiment of the present disclosure. For example... Figure 3 As shown, the display device also includes a display panel 400, and light emitted from the light guide structure 200 is incident on the display panel 400. Figure 3 The illustration schematically shows light rays emitted from the light guide structure 200 directly hitting the display panel 400, but it is not limited to this. Light rays emitted from the light guide structure 200 can also pass through optical elements such as mirrors and lenses before hitting the display panel 400. For example, the display panel 400 can be a transmissive display panel or a reflective display panel.

[0106] For example, such as Figure 3 As shown, the display panel 400 includes a first substrate 410 and a second substrate 420 disposed opposite to each other, and a liquid crystal layer 430 disposed between the first substrate 410 and the second substrate 420. For example, the display panel 400 can be a liquid crystal display panel. For example, the first substrate 410 can be an array substrate, and an encapsulating adhesive 440 for encapsulating the liquid crystal layer 430 is also included between the first substrate 410 and the second substrate 420. For example, the liquid crystal display panel also includes a first polarizing layer 451 disposed on the side of the first substrate 410 away from the second substrate 420 and a second polarizing layer 452 disposed on the side of the second substrate 420 away from the first substrate 410. For example, the light guide structure 200 is configured to provide light (e.g., backlight) to the liquid crystal display panel, which is converted into image light after passing through the liquid crystal display panel.

[0107] For example, the polarization axis direction of the first polarization layer 451 and the polarization axis direction of the second polarization layer 452 are perpendicular to each other, but are not limited thereto. For example, the polarization direction of linearly polarized light that can pass through the first polarization layer 451 intersects the polarization direction of linearly polarized light that can pass through the second polarization layer 452.

[0108] For example, only light with a specific polarization state can pass through the first polarization layer 451 between the liquid crystal layer 430 and the light guide structure 200 and enter the liquid crystal display panel for imaging. For example, when the backlight incident on the backlight side of the liquid crystal display panel is unpolarized light, at most 50% of the backlight can be utilized by the liquid crystal display panel, and the remaining light will be wasted or absorbed by the liquid crystal layer to generate heat. However, in this embodiment, by using a polarization beam splitter and a polarization conversion structure, almost all the unpolarized light emitted by the light source can be converted into light with a specific polarization state (first polarized light and third polarized light) that can be utilized by the liquid crystal display panel. That is, both the first polarized light and the third polarized light can pass through the first polarization layer 451 and enter the liquid crystal layer, effectively improving the utilization rate of the light emitted by the light source.

[0109] For example, such as Figure 3 As shown, the display panel 400 includes a first display area 401 corresponding to the first light-emitting area 201 and a second display area 402 corresponding to the second light-emitting area 202. The first display area 401, corresponding to the first light-emitting area 201, means that all or most of the light emitted from the first light-emitting area 201 is emitted from the first display area 401; the second display area 402, corresponding to the second light-emitting area 202, means that all or most of the light emitted from the second light-emitting area 202 is emitted from the second display area 402. For example, a straight line extending along the Y direction can pass through the first light-emitting area 201 and the first display area 401, and another straight line extending along the Y direction can pass through the second light-emitting area 202 and the second display area 402.

[0110] For example, such as Figure 3 As shown, the light adjustment unit 300 includes a control sub-unit 310, which is configured to determine the positions of the first display area 401 and the second display area 402 based on the positions of the first light-emitting area 201 and the second light-emitting area 202, and adjust the energy distribution, such as the intensity, of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from the first display area 401 and the second display area 402.

[0111] For example, such as Figure 3 As shown, the control subunit 310 is configured to adjust the rotation angle of liquid crystal molecules within the liquid crystal layer 430 corresponding to the first display area 401 and the second display area 402, thereby adjusting the energy distribution, such as intensity, of at least one of the first wavelength light and the second wavelength light in the light emitted from the first display area 401 and the second display area 402. The liquid crystal layer corresponding to the aforementioned display area refers to a display device including a display surface, with display areas on the display surface. If the orthographic projection of a portion of the liquid crystal layer on the display surface falls within a display area, then that portion of the liquid crystal layer corresponds to that display area. The aforementioned display surface can be a solid surface. For example, the display surface can be a surface on the display screen of the display device, which can be a plane or a curved surface.

[0112] For example, the control subunit 310 can be a processor. By writing the position information of the first light-emitting area 201 and the second light-emitting area 202, as well as the wavelength band information of the corresponding emitted light, into the processor, the processor determines the position of different display areas in the display panel 400 corresponding to different light-emitting areas, and then adjusts the rotation angle of the liquid crystal molecules in the corresponding display areas. For example, if the intensity of the blue light emitted from the first light-emitting area 201 is greater than the intensity of the blue light emitted from the second light-emitting area 202, and the light emitted from the first light-emitting area 201 is bluish, the processor can control the deflection direction of the liquid crystal molecules corresponding to the blue sub-pixel in the first display area 401 according to the information of the bluish light emitted from the first light-emitting area, thereby reducing the intensity of the transmitted light, reducing the brightness of the blue light in the display area, and improving the color shift. For example, if the intensity of the yellow light emitted from the second light-emitting area 202 is greater than that of the yellow light emitted from the first light-emitting area 201, and the light emitted from the second light-emitting area 202 is yellowish, the processor can control the deflection direction of the liquid crystal molecules corresponding to the red and green sub-pixels in the second display area 402 based on the information that the light emitted from the second light-emitting area is yellowish, thereby reducing the intensity of the transmitted light and thus weakening the brightness of the red and green light in the display area and improving the color shift.

[0113] Of course, the embodiments disclosed herein are not limited to this. Alternatively, the light emitted from the first light-emitting area may be yellowish, and the light emitted from the second light-emitting area may be bluish. Or, the light emitted from one of the first and second light-emitting areas may be reddish, while the light emitted from the other light-emitting area may be bluish or normal.

[0114] For example, Figure 3 The display device shown can be applied to a head-up display, and the processor can be the control chip of the head-up display, and / or it can also be the control chip of the transportation equipment where the head-up display is located, such as the chip of a car infotainment system.

[0115] For example, Figure 3 The diagram schematically illustrates that the control sub-unit 310 is a component other than the display panel 400, which is electrically connected to the display panel 400 to adjust the light emitted from the display panel 400. However, it is not limited to this; the control sub-unit could also be a processor within the display panel. This disclosure does not limit this, and the configuration can be tailored to the actual needs of the product.

[0116] For example, the control sub-section in the embodiments of this disclosure can be implemented in software so that it can be executed by various types of processors, or it can be implemented by a hardware circuit, which includes conventional very large-scale integrated circuits (VLSI) or gate arrays, as well as existing semiconductors such as logic chips, transistors, or other discrete components.

[0117] For example, Figure 4 This is a partial structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. Figure 4 The example shown is the same as Figure 3 The difference in the example shown is the light adjustment unit 300, such as Figure 4 As shown, the light adjustment unit 300 includes a first color filter layer 320 and a second color filter layer 330. The first color filter layer 320 is configured to transmit at least a first wavelength of light, and the second color filter layer 330 is configured to transmit at least a second wavelength of light. The transmittance of the first color filter layer 320 corresponding to the first light-emitting region 201 is lower than the transmittance of the second color filter layer 330, and the transmittance of the first color filter layer 320 corresponding to the second light-emitting region 202 is higher than the transmittance of the second color filter layer 330. For example, the first color filter layer 320 and the second color filter layer 330 are disposed in the same layer. For example, the first color filter layer 320 and the second color filter layer 330 are different regions of the same color filter layer.

[0118] For example, after the first wavelength light and the second wavelength light emitted from the first light-emitting region 201 pass through the first color filter layer 320 and the second color filter layer 330, the intensity of the first wavelength light decreases; for example, the intensity of the first wavelength light after passing through the color filter layer is less than the intensity of other wavelength light. Similarly, after the first wavelength light and the second wavelength light emitted from the second light-emitting region 202 pass through the first color filter layer 320 and the second color filter layer 330, the intensity of the second wavelength light decreases; for example, the intensity of the second wavelength light after passing through the color filter layer is less than the intensity of other wavelength light. By adjusting the relationship between the transmittance of the first color filter layer and the second color filter layer corresponding to different light-emitting regions, the color shift of the light emitted from the first color filter layer and the second color filter layer can be alleviated or eliminated. The first color filter layer 320 and the second color filter layer 330 corresponding to the first light-emitting area 201 refer to the light emitted from the first light-emitting area 201 passing through the first color filter layer 320 and the second color filter layer 330; the first color filter layer 320 and the second color filter layer 330 corresponding to the second light-emitting area 202 refer to the light emitted from the second light-emitting area 202 passing through the first color filter layer 320 and the second color filter layer 330.

[0119] Figure 4 The diagram schematically illustrates that the first and second color filters can be part of the display panel, for example, they can be disposed between the second substrate 420 and the liquid crystal layer 430, or on the second substrate 420, but are not limited thereto. The first and second color filters can also be located between the display panel and the light guide structure to adjust the light emitted from the light guide structure. For example, when the first and second color filters are located outside the display panel, their positions can be set according to the positions of different color sub-pixels in the display panel, or they can be set without being based on the positions of different color sub-pixels in the display panel.

[0120] For example, such as Figure 4As shown, the first color filter layer 320 is configured to transmit at least one of red and green light, and the second color filter layer 330 is configured to transmit blue light. For example, the first color filter layer 320 is configured to have a higher transmittance for red and green light than for blue light, and the second color filter layer 330 is configured to have a higher transmittance for blue light than for red and green light. For example, in the light emitted from the first light-emitting region 201, the intensity of at least one of red and green light is higher, and the intensity of blue light is lower. By reducing the transmittance of at least one of the red and green light transmitted by the first color filter layer 320 corresponding to the first light-emitting region 201, and / or increasing the transmittance of blue light transmitted by the second color filter layer 330 corresponding to the first light-emitting region 201, the intensity of each color of light emitted from the first light-emitting region 201 after passing through the first color filter layer 320 and the second color filter layer 330 can be adjusted, thereby alleviating or eliminating the color shift of the light emitted from the first light-emitting region 201. For example, in the light emitted from the second light-emitting region 202, the intensity of at least one of the red and green light is low, while the intensity of the blue light is high. By increasing the transmittance of at least one of the red and green light transmitted through the first color filter layer 320 corresponding to the second light-emitting region 202, and / or decreasing the transmittance of the blue light transmitted through the second color filter layer 330 corresponding to the second light-emitting region 202, the intensity of each color light after passing through the first color filter layer 320 and the second color filter layer 330 can be adjusted, thereby alleviating or eliminating the color shift of the light emitted from the second light-emitting region 202.

[0121] For example, Figure 5A This is a partial cross-sectional structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure. Figure 5B For along Figure 5A The diagram shows a cross-sectional structure of the first light guide element intercepted by line AA'. Figure 5C For along Figure 5A The diagram shows a cross-sectional view of the second light guide element cut by the BB' line. Figure 5A The display device shown includes a light adjustment unit 300 which can be... Figure 3 The control sub-unit 310 shown can also be Figure 4 The first color filter layer 320 and the second color filter layer 330 are shown. Figure 5A The polarization conversion structure 120 shown can be located on the side of the polarization beam splitter 110 that transmits light or on the side of the polarization beam splitter 110 that reflects light. When the polarization conversion structure 120 is located on the side of the polarization beam splitter 110 that transmits light, the polarization conversion structure 120 can be located on the light-incident side of the reflective element 130 (e.g., between the polarization beam splitter 110 and the reflective element 130) or on the light-exit side of the reflective element 130 (e.g., between the reflective element 130 and the light guide structure 200).

[0122] For example, such as Figure 5AAs shown, when the light transmitted by the polarization beam splitter 110 is the first part light 01 and the light reflected is the second part light 02, the first part light 01 (or the second part light 02) after passing through the polarization conversion structure 120 and the reflection element 130 is still called the first part light 01 (or the second part light 02). However, the first part light 01 (or the second part light 02) at this time is the converted first part light 01 (or the second part light 02). Therefore, in this disclosure, the first part light and the second part light after being split by the beam splitter are still called the first part light and the second part light before being emitted from the first light-emitting area and the second light-emitting area. It does not limit whether the first part light or the second part light is converted by the polarization conversion structure.

[0123] For example, the divergence angle of at least one of the first part light 01 and the second part light 02 is θ, where θ ranges from 0 to 40 degrees. The divergence angle is a commonly used standard for measuring the emission angle of a light beam. For example, θ / 2 is the angle between the emission direction and the optical axis when the emission intensity is half of the axial intensity value; or, θ / 2 can also be the angle between the emission direction and the optical axis when the emission intensity is 60% or 80% of the radial intensity value. For example, the divergence angle of at least one of the first part light 01 and the second part light 02 can be 0 to 20 degrees. For example, the divergence angle of at least one of the first part light 01 and the second part light 02 can be 10 to 30 degrees. For example, the divergence angle of at least one of the first part light 01 and the second part light 02 can be no greater than 5 degrees. For example, when a light ray with a certain divergence angle propagates within a light guide structure, as the light ray undergoes multiple reflections or total internal reflections on the inner surface of the light guide structure, the uniformity of the light ray (especially the uniformity of brightness) increases, thus improving the uniformity of the emitted light ray.

[0124] For example, the light emitted from the light source can have a certain divergence angle after passing through the polarization beam splitter and polarization conversion structure. For instance, the light may have a certain divergence angle even before passing through the polarization beam splitter and polarization conversion structure after exiting the reflective light guide structure (e.g., a total internal reflection lamp cup); or, the light may have a certain divergence angle after being converted by the polarization conversion structure and then placed on the light diffusion film. This embodiment does not limit this. Therefore, when light with a certain divergence angle propagates in the light guide structure, it will undergo multiple reflections or total internal reflections and be mixed uniformly, which can avoid uneven brightness of the light emitted from different light-emitting areas.

[0125] For example, such as Figure 5A As shown, the light guide structure 200 includes an optical output section 2100, which includes a first optical output section 2110 and a second optical output section 2120. The first optical output section 2110 is configured to couple a first portion of light O1 from the first light output area 201, and the second optical output section 2120 is configured to couple a second portion of light O2 from the second light output area 202.

[0126] For example, such as Figure 5A As shown, the first optical output portion 2110 and the second optical output portion 2120 do not completely overlap in the Y direction, which is perpendicular to the extending direction of the light guide structure 200. For example, Figure 5A The diagram schematically shows that the first optical output section 2110 and the second optical output section 2120 overlap in the Y direction. In this case, the first light-emitting area 201 and the second light-emitting area 202 overlap. At this time, the light emitted from the part of the first light-emitting area 201 that does not overlap with the second light-emitting area 202 has a color shift, for example, either blue or yellow. The light emitted from the part of the second light-emitting area 202 that does not overlap with the first light-emitting area 201 has a color shift, for example, either blue or yellow. The color shift in the overlapping part of the first light-emitting area 201 and the second light-emitting area 202 is very low or there is no color shift. For example, after the blue and yellow light overlap, it is almost white light emitted.

[0127] The embodiments disclosed herein are not limited thereto. For example, when the first optical output section and the second optical output section do not overlap, the first light-emitting area and the second light-emitting area do not overlap significantly. The light emitted from each position of the first light-emitting area is basically color-biased, and the light emitted from each position of the second light-emitting area is basically color-biased.

[0128] For example, if the entire first light-emitting section overlaps with the second light-emitting section, and the second light-emitting section, in addition to the overlapping portion with the first light-emitting section, also has a portion that does not overlap with the first light-emitting section, then the first light-emitting area completely falls within the second light-emitting area, and the light emitted from the first light-emitting area has a very low degree of color deviation or no color deviation, such as emitting white light; if the light emitted from the overlapping portion of the second light-emitting area and the first light-emitting area has a very low degree of color deviation or no color deviation, and the light emitted from the non-overlapping portion of the second light-emitting area has color deviation.

[0129] For example, if the entire second light-emitting section overlaps with the first light-emitting section, and the first light-emitting section, in addition to the overlapping portion, also has a portion that does not overlap with the second light-emitting section, then the second light-emitting area completely falls within the first light-emitting area, and the light emitted from the second light-emitting area has a very low degree of color deviation or no color deviation, emitting white light; if the light emitted from the overlapping portion of the first and second light-emitting areas has a very low degree of color deviation or no color deviation, and the light emitted from the non-overlapping portion of the first and second light-emitting areas has color deviation.

[0130] By setting the positions of the first and second optical couplers in this embodiment, the color-shifted light can be concentrated and emitted, making it easy to cooperate with the light adjustment unit to adjust the color shift.

[0131] For example, such as Figure 5AAs shown, at least a portion of the second light-emitting region 202 is located on one side of the first light-emitting region 201 in the direction parallel to the extension of the light guide structure 200 (the X direction as shown in the figure). For example, the portion of the second light-emitting region 202 that does not overlap with the first light-emitting region 201 is located on one side of the first light-emitting region 201 in the X direction. For example, at least a portion of the first light-emitting region 201 is located on one side of the second light-emitting region 202 in the direction parallel to the extension of the light guide structure 200 (the X direction as shown in the figure). For example, the portion of the first light-emitting region 201 that does not overlap with the second light-emitting region 202 is located on one side of the second light-emitting region 202 in the X direction.

[0132] For example, such as Figure 5A As shown, the polarization conversion structure 120 is located on the light-incident side of the second optical output section 2120, and the third polarized light, converted by the polarization conversion structure 120, is emitted from the second light-output region 202. For example, the first portion of light 01 transmitted by the polarization beam splitter 110 includes first polarized light, which is coupled out from the first light-output region 201 after passing through the first optical output section 2110. The second portion of light 02 reflected by the polarization beam splitter 110 includes second polarized light, which is converted into third polarized light by the polarization conversion structure 120, and then coupled out from the second light-output region 202 after passing through the second optical output section 2120. For example, as... Figure 5A As shown, when the polarization conversion structure 120 is located on the incident light side of the reflective element 130, the reflective element 130 can reflect the third polarized light, or the intermediate polarized light before the second polarized light is converted into the third polarized light.

[0133] For example, such as Figure 5A As shown, the polarization conversion structure 120 is located on the light-incident side of the light guide structure 200. The third polarized light, converted by the polarization conversion structure 120, is incident on the light guide structure 200 and exits from the second light-out region 202. For example, the polarized light incident on the light guide structure 200 includes the first polarized light and the third polarized light.

[0134] For example, such as Figure 5A As shown, the light guide structure 200 includes a first light guide element 210 and a second light guide element 220. A first portion of light O1 is incident on the first light guide element 210, which includes a first optical output portion 2110. A second portion of light O2 is incident on the second light guide element 220, which includes a second optical output portion 2120. The first optical output portion 2110 and the second optical output portion 2120 do not completely overlap in a direction perpendicular to the extension direction of the light guide structure 200 (such as the Y direction). For example, the first optical output portion 2110 and the second optical output portion 2120 are located in the first light guide element 210 and the second light guide element 220, respectively.

[0135] For example, such as Figure 5AAs shown, the first light guide element 210 and the second light guide element 220 overlap in the Y direction.

[0136] For example, such as Figure 5A As shown, the optical output section 2100 includes a transflective element array, which includes a plurality of transflective elements 2010. At least some of the transflective elements 2010 in the transflective element array are configured to partially reflect and partially transmit light propagating to the transflective elements 2010, so that a portion of the light is coupled out of the light guide structure 200 and another portion continues to propagate in the light guide structure 200.

[0137] For example, such as Figure 5B and Figure 5C As shown, multiple transparent and reflective elements 2010 are arranged along the X direction, and each transparent and reflective element 2010 extends along the Z direction.

[0138] For example, such as Figure 5A As shown, both the first optical output section 2110 and the second optical output section 2120 include multiple transflective elements 2010, and the transflective elements 2010 in each optical output section are arranged along the propagation direction of light in the light guide structure 200. The aforementioned "propagation direction of light propagating in the light guide structure" can refer to the overall (macro) direction of light propagation, for example, the direction of light propagation in the light guide structure 200 refers to... Figure 5A The arrow in the X direction indicates the direction. For example, the number of transflective elements 2010 included in the first optical output section 2110 may be the same as or different from the number of transflective elements 2010 included in the second optical output section 2120.

[0139] For example, such as Figure 5A As shown, the plurality of reflective elements 2010 in at least one optical coupler output section can be parallel to each other, in which case the light emitted from the optical coupler output section is parallel light. However, the embodiments of this disclosure are not limited to this; the plurality of reflective elements in each optical coupler output section may also not be parallel. By adjusting the included angle between the plurality of reflective elements, the light emitted from the optical coupler output section can be adjusted to convergent light or divergent light. In the embodiments of this disclosure, "parallel" includes completely parallel and approximately parallel. Completely parallel means that the included angle between any two is 0°, and approximately parallel means that the included angle between any two is not greater than 20°, for example, not greater than 10°, for example, not greater than 5°.

[0140] For example, such as Figure 5A As shown, along the propagation direction of the light propagating in the light guide structure 200, the reflectivity of the plurality of transflective elements 2010 in at least one light output section gradually increases to improve the uniformity of the light emitted from the corresponding light output area.

[0141] For example, the transmission-reflection element 2010 can transmit and reflect light without wavelength selectivity or polarization selectivity. The wavelength and polarization properties of light incident on the transmission-reflection element 2010 remain almost unchanged after transmission and reflection. For example, the transmission-reflection element 2010 can be made of inorganic dielectric film, such as a thin film composed of one or more layers of metal oxide / metal nitride films, with each layer having a thickness of approximately 10 nm to 1000 nm. The overall transmission and reflection performance of the inorganic dielectric film can be controlled by changing the film material and / or the stacking method.

[0142] For example, the transflective element 2010 may include a selective reflector (e.g., polarization selectivity and / or wavelength selectivity), such that light incident on the transflective element 2010 exhibits different wavelength and / or polarization properties after transmission and reflection. For instance, light entering the first light guide element 210 may include first polarized light and a small amount of second polarized light. The selective reflector is configured to have a higher reflectivity for the first polarized light than for the second polarized light, and a higher transmittance for the second polarized light than for the first polarized light. Thus, the transflective element 2010 can progressively reflect the first polarized light out of the light guide structure 200. Similarly, light entering the second light guide element 210 may include third polarized light and a small amount of second polarized light. The selective reflector is configured to have a higher reflectivity for the third polarized light than for the second polarized light, and a higher transmittance for the second polarized light than for the third polarized light. Thus, the transflective element 2010 can progressively reflect the third polarized light out of the light guide structure 200. For example, the light entering the second light guide element 210 may include second polarized light and a small amount of first polarized light. The selective reflective film is configured to have a reflectivity for the second polarized light greater than that for the first polarized light, and a transmittance for the first polarized light greater than that for the second polarized light. Thus, the reflective element 2010 can gradually reflect the second polarized light out of the light guide structure 200. The second polarized light reflected out of the light guide structure can be converted into third polarized light by the polarization conversion structure.

[0143] For example, the aforementioned selective reflective film can be a brightness enhancement film (BEF), which has a high reflectivity for one type of polarized light and a high transmittance for another type of polarized light (for example, the selective reflective film has a high reflectivity for S-polarized light and a high transmittance for P-polarized light). The reflective element 2010 can utilize the selectivity of polarization reflection to make light gradually reflected out of the light guide structure 200 by the reflective element 2010.

[0144] For example, embodiments of this disclosure are not limited to the optical output section including a transflective element; for example, the optical output section may also include at least one of a volume grating, a blazed grating, a prism, and light-emitting dots.

[0145] For example, such as Figure 5A As shown, the light guide structure 200 also includes a light guide medium 250, which is configured to allow light entering the light guide medium 250 to propagate by total internal reflection or non-total internal reflection, and the light output section 2100 is configured to couple the light propagating in the light guide medium 250 to a predetermined area.

[0146] For example, the light guide medium 250 includes a transparent material, such as a transparent substrate made of a transparent material such as resin, glass or plastic, which is configured to allow light entering the light guide medium 250 to propagate by total internal reflection or non-total internal reflection; or, the light guide medium 250 includes a gas, such as air.

[0147] For example, "non-total internal reflection propagation" here can refer to the propagation of light rays (e.g., some rays with small divergence angles) in the light guide structure 200 in a mode other than total internal reflection. For example, light rays can propagate within the light guide structure 200 without reflection (e.g., no reflection at the interface between the light guide structure 200 and air). Alternatively, light rays (e.g., some rays with large divergence angles) can also propagate by reflection in a non-total internal reflection manner. For example, they may not meet the conditions for total internal reflection. For instance, the reflection angle when light rays are reflected at the interface between the light guide structure 200 and air (or other media) is less than the critical angle for total internal reflection, and it can be considered that light rays do not or rarely propagate through total internal reflection in the light guide structure 200. For example, the principal direction of the light rays incident on the light guide structure 200 or the direction of the principal optical axis of the light rays incident on the light guide structure 200 is a straight line, for example, it can be parallel to the extension direction of the light guide structure 200, and some light rays can continue to propagate after specular reflection on the surface of the light guide structure 200.

[0148] For example, "total internal reflection propagation" here can refer to the reflection angle of light rays (e.g., light rays with a relatively large divergence angle that satisfy the condition of total internal reflection) at the interface between the light guide structure 200 and air (or other medium) being not less than the critical angle of total internal reflection. For example, most of the light rays incident on the light guide structure 200 propagate through total internal reflection. For example, a portion of the light rays incident on the light guide structure 200 are almost unreflected and propagate in a straight line in the light guide medium, while another portion of the light rays continue to propagate after total internal reflection.

[0149] For example, the first light-emitting region 201 and the second light-emitting region 202 in this embodiment can guide two regions on the light-emitting surface of the light guide structure 200. These two regions may or may not overlap. The light-emitting surface can be a solid surface, such as a surface of a transparent material included in the light guide structure.

[0150] For example, the light guide medium 250 is made of a material that can realize waveguide function, typically a transparent material with a refractive index greater than 1. For example, the material of the light guide medium 250 may include one or more of silicon dioxide, lithium niobate, silicon-on-insulator (SOI), polymer, group III-V semiconductor compounds, and glass.

[0151] For example, the light guide medium 250 can be a planar substrate, a strip substrate, or a ridge substrate. For example, in at least one example of the embodiments of this disclosure, the light guide medium uses a planar substrate to form a uniform surface light source.

[0152] For example, the reflective element 2010 can be disposed in the light guide medium 250 by plating or bonding. For example, the light guide medium 250 can be divided into multiple parallelogram-shaped prisms, such as parallelepipeds, with the reflective element 2010 disposed between the joined parallelepipeds. For example, the medium between adjacent reflective elements 2010 can be the light guide medium 250. For example, the light guide medium 250 includes multiple waveguide sub-mediums arranged along the X-direction and bonded to each other, with the reflective element 2010 sandwiched between adjacent waveguide sub-mediums. Each waveguide sub-medium is configured to cause total internal reflection of light, and the reflective element 2010 is configured to couple some of the light out of the light guide structure 200 by reflecting and disrupting the total internal reflection condition.

[0153] For example, when the light guide medium 250 is air, the reflective element 2010 can be fixed by means of a support plate, adhesive, etc., which can reduce the weight of the light guide structure and make it more practical. For example, when the light guide medium 250 is air, the edge of the reflective element on the side where the light is emitted is located in the same plane (a plane perpendicular to the Y direction). This plane is a non-physical virtual surface, and the light emission area of ​​the light guide structure can also be a region on this virtual surface.

[0154] For example, the light guide structure may also include an optical coupling entry point, configured to allow light incident on the light guide structure to propagate via total internal reflection. The optical coupling entry point may include at least one of a surface grating, a volume grating, a blazed grating, a prism, and a reflective structure, guiding light emitted from the light source into the light guide medium through at least one of reflection, refraction, and diffraction effects, thereby satisfying the total internal reflection condition and thus conducting the light. However, this is not a limitation; the light guide structure may also be without an optical coupling entry point.

[0155] Figure 6 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. Figure 6 The example shown is the same as Figure 5A The difference in the example shown is that the polarization conversion structure 120 is located on the light-emitting side of the reflective element 130, and the reflective element 130 reflects the second polarized light.

[0156] For example, such as Figure 6 As shown, the polarization conversion structure 120 is located inside the light guide structure 200. The polarized light incident on the light guide structure 200 includes first polarized light and second polarized light. The second polarized light is converted into third polarized light by the polarization conversion structure 120 located inside the light guide structure 200. The third polarized light is coupled out from the second light output region 402 after passing through the second light coupling part 2120.

[0157] Of course, the embodiments disclosed herein are not limited to this. The polarization conversion structure may also be located between the reflective element and the light guide structure. In this case, the second polarized light reflected by the reflective element is converted into the third polarized light by the polarization conversion structure. The polarized light incident on the light guide structure includes the first polarized light and the third polarized light. The third polarized light is coupled out from the second light output region after passing through the second light coupling part.

[0158] Figure 6 In the example shown, except for the position of polarization conversion structure 120 and... Figure 5A Except for the different positions of the polarization conversion structure 120 in the example shown, the characteristics of other components can be the same, and will not be described in detail here.

[0159] Figure 7 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. Figure 7 The example shown is the same as Figure 6 The difference in the example shown is that the polarization conversion structure 120 is located on the light-emitting side of the second optical coupler output section 2120. For example, as Figure 7 As shown, the polarized light incident on the light guide structure 200 includes first polarized light and second polarized light. The second polarized light is converted into third polarized light by the polarization conversion structure 120 and then emitted from the second light emission region 202; or, the second polarized light can also be converted into third polarized light by the polarization conversion structure 120 after being emitted from the second light emission region 202.

[0160] For example, such as Figure 7 As shown, the first light guide element 210 and the second light guide element 220 overlap in the Y direction. The polarization conversion structure 120 can be located between the first light guide element 210 and the second light guide element 220. Taking the first light guide element 210 located on the light-emitting side of the second light guide element 220 as an example, the second polarized light propagates in the second light guide element 220 to the second light coupling part 2120 and is coupled out by it. The second polarized light coupled out by the second light coupling part 2120 is converted into third polarized light by the polarization conversion structure 120. The third polarized light passes through part of the structure of the first light guide element 210 and is emitted from the second light-emitting region 202.

[0161] The embodiments disclosed herein are not limited thereto. For example, the polarization conversion structure may also be located on the side of the first light guide element away from the second light guide element. After the second polarized light propagates through the first light guide element and the second light guide element, it is emitted from the second light emission area. The second polarized light emitted from the light guide structure is converted into third polarized light by the polarization conversion structure.

[0162] Figure 8 This is a schematic diagram of a light guide structure and a beam splitter in a display device, which is provided as another example of an embodiment of this disclosure. Figure 8 The light guide structure shown differs from the light guide structures in any of the examples above in that the first light guide element 210 and the second light guide element 220 in this light guide structure 200 do not overlap in the Y direction. For example, as Figure 8 As shown, the first optical output portion 2110 and the second optical output portion 2120 are located in the first light guide element 210 and the second light guide element 220, respectively, and the first optical output portion 2110 and the second optical output portion 2120 do not overlap in the Y direction. Figure 8 In any of the above examples, the first light guide element 210 is provided with a first optical output portion 2110, and the second light guide element 220 is provided with a second optical output portion 2120.

[0163] Figure 8 The first and second light guide elements in the example shown may have the same structural features as the first and second light guide elements in any of the examples above. Figure 8 The polarization beam splitter in the example shown may have the same structural features as the polarization beam splitter in any of the examples above, and will not be described again here. Figure 8 The display panel and its relative position to the light guide structure in the example shown can have the same structural features and relative positional relationship to the light guide structure as the display panel in any of the above examples, and will not be repeated here. Figure 8 The light source and its relative position to the light guide structure in the example shown can have the same structural features and relative positional relationship with the light guide structure as the light source in any of the above examples, and will not be repeated here.

[0164] Figure 8 The polarization conversion structure in the example shown can have the same structural features as the polarization conversion structure in any of the above examples, and can be located on the light-incident side or the light-outcident side of the second optical coupler. It can be located in the light guide structure or outside the light guide structure. This example does not limit this, as long as it can convert the second polarized light into the third polarized light.

[0165] The above examples of this disclosure schematically show that the first light guide element and the second light guide element are separate elements, but are not limited thereto; the first light guide element and the second light guide element may also be integrated.

[0166] Figure 9 This is a schematic diagram of a light guide structure, a beam splitter, a reflector, and a polarization conversion structure in a display device provided as another example of an embodiment of this disclosure. Figure 9 The light guide structure in the illustrated example differs from the light guide structures in any of the examples described above in that the light guide structure 200 includes a third light guide element 230 and a fourth light guide element 240. The third light guide element 230 includes a first light-coupled output portion 2110 and a second light-coupled output portion 2120, which do not overlap in a direction perpendicular to the extending direction of the light guide structure 200. The first light-coupled output portion 2110 and the second light-coupled output portion 2120 in this example may have the same structural features as those in any of the examples described above, and in this example, the first light-coupled output portion 2110 and the second light-coupled output portion 2120 are located within the same light guide element (such as the third light guide element 230).

[0167] For example, such as Figure 9 As shown, the first portion of light O1 obtained by the polarization beam splitter 110 is incident on the third light guide element 230 and coupled out by the first light coupling part 2110; the second portion of light O2 obtained by the polarization beam splitter 110 is incident on the fourth light guide element 240, and propagates from the fourth light guide element 240 to the third light guide element 230 and is coupled out by the second light coupling part 2120.

[0168] For example, such as Figure 9 As shown, the polarization conversion structure 120 can be located inside the fourth light guide element 240, and after converting the second polarized light into the third polarized light, the third polarized light is incident on the third light guide element 230 and coupled out by the second light coupling part 2120 in the third light guide element 230.

[0169] For example, such as Figure 9 As shown, a reflection structure 140 is provided on the side of the polarization conversion structure 120 away from the light incident side of the fourth light guide element 240. The second polarized light incident on the polarization conversion structure 120 can be converted into fourth polarized light. After being reflected by the reflection structure 140, the fourth polarized light is converted into third polarized light again by the polarization conversion structure 120. That is, the second polarized light is converted into third polarized light after being converted twice by the polarization conversion structure 120. For example, the second polarized light can be linearly polarized light, and the fourth polarized light can be circularly polarized light or elliptically polarized light. The embodiments of this disclosure are not limited to this. The second polarized light can also be converted into third polarized light only once by the polarization conversion structure, and the third polarized light is reflected by the reflection structure into the third light guide element.

[0170] For example, such as Figure 9As shown, the third light guide element 230 is also provided with an optical coupler entry section 231, which is configured to allow light entering the third light guide element 230 to undergo total internal reflection.

[0171] Figure 9 The illustration schematically shows the polarization conversion structure located within the fourth light guide element, but it is not limited to this. For example, the polarization conversion structure could also be located on the light-incident side of the fourth light guide element, in which case the polarized light incident on the fourth light guide element includes third polarized light; for example, the polarization conversion structure could be located on the light-outceasing side of the fourth light guide element, in which case the polarized light incident on and exiting the fourth light guide element is second polarized light; for example, the polarization conversion structure could also be located in the third light guide element and on the light-incident side of the second optical coupler, in which case the polarized light exiting the fourth light guide element and incident on the third light guide element is second polarized light; for example, the polarization conversion structure could also be located on the light-outceasing side of the second optical coupler, in which case the polarized light exiting the second optical coupler is second polarized light. This example does not limit the position of the polarization conversion structure and can be set according to actual product requirements. The polarization conversion structure in this example can have the same structural features as the polarization conversion structure in any of the above examples, and will not be described again here.

[0172] This disclosure schematically shows that the third light guide element and the fourth light guide element are separate elements, but it is not limited thereto; the third light guide element and the fourth light guide element can also be integrated.

[0173] For example, Figure 9 The light guide structure shown may also include the same light guide medium as in any of the examples above, which will not be elaborated here.

[0174] Figure 9 The display panel and its relative position to the light guide structure in the example shown can have the same structural features and relative positional relationship to the light guide structure as the display panel in any of the above examples, and will not be repeated here. Figure 9 The light source and its relative position to the light guide structure in the example shown can have the same structural features and relative positional relationship with the light guide structure as the light source in any of the above examples, and will not be repeated here.

[0175] Figure 9 The polarization beam splitter and reflector in the example shown may have the same structural features as those in any of the examples above, and will not be described again here.

[0176] For example, Figure 10 This is a partial cross-sectional structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. Figure 10 The example shown is the same as Figure 5AThe difference in the example shown is that at least one of the first optical output section 2110 and the second optical output section 2120 is provided with a light homogenizing section 500 on the light incident side. The light homogenizing section 500 is configured to reflect the light incident on the light homogenizing section 500 at least once so that the light propagates to at least one of the first optical output section 2110 and the second optical output section 2120.

[0177] For example, such as Figure 10 As shown, the light homogenizing section 500 and the second light coupling section 2120 can be arranged along the X direction. For example, the light homogenizing section 500 and the first light coupling section 2110 can be arranged along the Y direction. For example, the light rays incident from the light source section 0300 onto the light homogenizing section 500 can undergo total internal reflection and / or non-total internal reflection within the light homogenizing section 500 to increase the uniformity of the light rays.

[0178] For example, such as Figure 10 As shown, the light homogenizing section 500 may include reflective surfaces 510 facing each other. The reflective surfaces 510 may be opaque. After light propagates through the reflective surfaces 510 by non-total internal reflection, it is coupled out by the second light coupling section 2120.

[0179] For example, such as Figure 10 As shown, when the light homogenizing section 500 and the first light output section 2110 overlap in the Y direction, the light rays propagating in the light homogenizing section 500 will hardly enter the first light output section 2110.

[0180] For example, such as Figure 10 As shown, a transparent material or air can be disposed between the opposing reflective surfaces 510, and this embodiment of the present disclosure does not limit this. For example, when a transparent material is disposed between the opposing reflective surfaces, the transparent material can be an integral structure with the reflective surface, or it can be a structure of two different materials that can be bonded together.

[0181] Figure 10 The example shown schematically illustrates that a light-diffusing section is provided on the light-incident side of the second optical coupler outlet, but it is not limited thereto. A light-diffusing section with the above-described features may also be provided on the light-incident side of the first optical coupler outlet, or a light-diffusing section with the above-described features may be provided on both the light-incident side of the first optical coupler outlet and the light-incident side of the second optical coupler outlet. The embodiments disclosed herein do not limit this.

[0182] Figure 10 The structures shown in the examples, other than the light guide structure, can have the same characteristics as the corresponding structures in any of the above examples, and will not be described again here.

[0183] Figure 11 This is a partial structural schematic diagram of a light source device provided according to at least one embodiment of the present disclosure. For example... Figure 11As shown, the light source device includes a light source unit 0300, a polarizing beam splitter 110, and a light guide structure 200. The light emitted from the light source unit 0300 is configured to be incident on the polarization beam splitter 110. The polarization beam splitter 110 is configured to split the light incident on the light source unit 0300 into a first part of light 01 and a second part of light 02 with different properties. The light guide structure 200 includes a first light emitting region 201 and a second light emitting region 202 that do not completely overlap in a direction perpendicular to its extension direction. The light guide structure 200 is configured to allow the first part of light 01 incident on the light guide structure 200 to exit from the first light emitting region 201, and to allow the second part of light 02 incident on the light guide structure 200 to exit from the second light emitting region 202. The first part of light 01 and the second part of light 02 obtained after the polarization beam splitter 110 splits the light are respectively first polarized light and second polarized light with different polarization states. The light source device also includes a polarization conversion structure 120, which is configured to convert the second polarized light into a third polarized light, the third polarized light having the same polarization state as the first polarized light.

[0184] The light source unit 0300, polarization beam splitter 110, light guide structure 200, and polarization conversion structure 120 provided in this embodiment can be used with… Figures 1 to 10 The light source 0300, polarization beam splitter 110, light guide structure 200, and polarization conversion structure 120 in any of the examples provided have the same features and relative positional relationships, which will not be described again here.

[0185] For example, such as Figure 11 As shown, the emission direction of the light emitted from the light source unit 0300 is different from the emission direction of the light emitted from the first light emission area 201 and the second light emission area 202. For example, the light source unit 0300 does not overlap with the first light emission area 201 and the second light emission area 202 along the emission direction. For example, the light source unit 0300 emits light into the light guide structure 200 using a side-entry light incident method.

[0186] The light source device provided in this disclosure, by cooperating with the light adjustment unit provided in any of the above examples to adjust the intensity of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from different display areas in the display panel, is beneficial to improve or eliminate the color shift phenomenon of the display device.

[0187] For example, Figures 1 to 11The example shown schematically illustrates light emitted from a light guide structure directly incident on a display panel, but is not limited to this. Light emitted from the light guide structure can also pass through a light diffusion element before reaching the display panel. For example, the light diffusion element is configured to diffuse the light beam passing through it. For example, the light diffusion element is configured to diffuse the light beam passing through it without altering or minimally altering the optical axis of the beam. The "optical axis" mentioned above refers to the centerline of the light beam, which can also be considered the main direction of beam propagation. For example, the light diffusion element includes at least one of diffractive optical elements and scattering optical elements. For example, the light diffusion element can be a scattering optical element, such as a homogenizer or diffuser. When the light beam passes through a scattering optical element such as a homogenizer, scattering mainly occurs, and a small amount of diffraction also occurs. After passing through the scattering optical element, the light beam forms a large spot (for example, the spot can be considered as a cross-section of the diffused light beam along the propagation direction). For example, the light diffusion element can also be a diffractive optical element (DOE) with relatively more precise control over the diffusion effect, such as a beam shaper. For example, diffractive optical elements, by designing specific microstructures on their surface, primarily function as light beam expanders through diffraction, and the size and shape of the light spot are controllable. Of course, the embodiments disclosed herein are not limited to the light-diffusing element being located on the light-incident side of the display panel; it can also be located on the light-emitting side of the display panel, for example, in close proximity to the light-emitting side of the display panel.

[0188] For example, a light converging element can be disposed between the light guide structure and the display panel. For example, the light converging element can be located between the light guide structure and the light diffusing element. For example, the light converging element can be a lens, prism, curved mirror, or lens combination, such as a Fresnel lens and / or a curved lens, such as a convex lens, a concave lens, or a lens combination, etc.

[0189] Figure 12 This is a partial cross-sectional structural diagram of a heads-up display provided according to an embodiment of the present disclosure. Figure 12 As shown, the head-up display includes a reflective imaging unit 600 and a display device as shown in any of the above examples. This disclosure is not limited to these embodiments; the head-up display may also include the reflective imaging unit 600 and a light source device as shown in any of the above examples. Figure 12 The display device in the head-up display is shown schematically. Figure 5A The display device shown is not limited to this. For example, such as... Figure 12 As shown, the reflective imaging unit 600 is configured to reflect the light emitted from the display device to the observation area 001 of the head-up display (e.g., the eye box area 001).

[0190] For example, such as Figure 12As shown, the reflective imaging unit 600 is configured to reflect light emitted from the display device to the eye box region 001 and transmit ambient light. A user located in the eye box region 001 can view the image 002 of the display device reflected by the reflective imaging unit 600, as well as the ambient scene located on the side of the reflective imaging unit 600 away from the eye box region 001. For example, when image light emitted from the display device is incident on the reflective imaging unit 600, and the light reflected by the reflective imaging unit 600 is incident on the user, such as the eye box region 001 where the driver's eyes are located, the user can observe a virtual image formed, for example, outside the reflective imaging unit, without affecting the user's observation of the external environment.

[0191] For example, the aforementioned eye box area 001 refers to the planar area where the user's eyes are located and where they can see the image displayed on the head-up display. For example, even if the user's eyes are offset from the center of the eye box area by a certain distance, such as moving a certain distance up or down or left or right, the user's eyes will still be within the eye box area, and the user will still be able to see the image displayed on the head-up display.

[0192] For example, such as Figure 12 As shown, the reflective imaging unit 600 can be the windshield (e.g., windshield glass) or imaging window of a motor vehicle, corresponding to a windshield-HUD (W-HUD) and a combined-HUD (C-HUD), respectively.

[0193] For example, such as Figure 12 As shown, the reflective imaging unit 600 can be a flat plate that forms a virtual image through mirror reflection; or it can be a curved surface, such as a windshield or a transparent imaging plate with curvature, which will provide a longer imaging distance.

[0194] For example, the surface of the reflective imaging unit 600 facing the display device may be provided with a selective reflective film or similar layer to reduce the possibility of ghosting in the reflective imaging unit. For example, the selective reflective film is configured such that the reflectivity of the image light emitted from the display device in the wavelength range is greater than the reflectivity of light in wavelength ranges other than the image light wavelength range. For example, the selective reflective film is configured to reflect the image light emitted from the display device while transmitting light in wavelength ranges other than the image light wavelength range. For example, the selective reflective film may include a selective transmissive film formed by stacking inorganic oxide thin films or polymer thin films, wherein the transmissive film is formed by stacking at least two layers with different refractive indices.

[0195] Figure 12The illustration shows that the image light emitted by the display device is directly directed to the reflective imaging unit 600 without passing through other optical elements. However, it is not limited to this. The image light emitted by the display device can also pass through other optical elements (such as mirrors, lenses, etc.) before being directed to the reflective imaging unit 600. This can be set according to the actual product requirements. This disclosure does not limit this.

[0196] Figure 13 This is an exemplary block diagram of a transportation device provided according to at least one embodiment of the present disclosure. Figure 13 As shown, the transportation device includes a head-up display provided in at least one embodiment of this disclosure. The front window (e.g., the windshield) of the transportation device is reused as the reflective imaging unit 600 of the head-up display. The embodiments of this disclosure are not limited thereto; the transportation device may also include a display device or a light source device as shown in any of the above examples.

[0197] For example, the transportation equipment can be various suitable transportation equipment, such as land transportation equipment such as various types of automobiles, or water transportation equipment such as ships, or air transportation equipment such as airplanes, which is equipped with windshields (e.g., at least one of front windshields, side windshields and rear windshields) and projects images onto the windshields through an in-vehicle display system.

[0198] The following points need to be explained:

[0199] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0200] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0201] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display device, comprising: A beam splitter is configured to split light incident on the beam splitter into a first part of light and a second part of light with different properties. as well as A light guide structure, the light guide structure including at least a first light-emitting area and a second light-emitting area that do not completely overlap in a direction perpendicular to its extension direction; The light guide structure is configured to cause light corresponding to the first portion of light incident on the light guide structure to exit from the first light-emitting area, and to cause light corresponding to the second portion of light incident on the light guide structure to exit from the second light-emitting area. The light emitted from the first light-emitting area and the second light-emitting area of ​​the light guide structure both include a first wavelength light and a second wavelength light. The energy distribution of the first wavelength light in the first light-emitting area and the second light-emitting area is different, and / or the energy distribution of the second wavelength light in the first light-emitting area and the second light-emitting area is different. The display device further includes a light adjustment unit, which is configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in at least one of the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area of ​​the display device before they are emitted from the display device.

2. The display device according to claim 1, further comprising: A light source unit, wherein the light emitted by the light source unit is incident on the beam splitter; as well as The light emitted from the light guide structure enters the display panel; The display panel includes a first display area corresponding to the first light-emitting area and a second display area corresponding to the second light-emitting area. The light adjustment unit includes a control subunit configured to determine the positions of the first display area and the second display area based on the positions of the first light-emitting area and the second light-emitting area, and to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area before being emitted from the display device.

3. The display device according to claim 2, wherein The display panel includes a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate. The light adjustment unit further includes liquid crystal molecules in the liquid crystal layer. The control sub-unit is configured to adjust the rotation angle of the liquid crystal molecules corresponding to the first display area and the second display area, so as to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in the light corresponding to the light emitted from the first light emitting area and the second light emitting area before being emitted from the display device.

4. The display device according to claim 1, wherein The light adjustment unit includes a first color filter layer and a second color filter layer. The first color filter layer is configured to transmit at least the first wavelength light, and the second color filter layer is configured to transmit at least the second wavelength light. The transmittance of the first color filter layer corresponding to the first light-emitting area is lower than the transmittance of the second color filter layer. The transmittance of the first color filter layer corresponding to the second light-emitting area is higher than the transmittance of the second color filter layer.

5. The display device according to claim 1 further includes a reflective element, the reflective element being configured to reflect light corresponding to the first portion of light or light corresponding to the second portion of light.

6. The display device according to any one of claims 1 to 5, wherein The beam splitter includes a polarization beam splitter. After polarization beam splitting, the first portion of light and the second portion of light obtained by the polarization beam splitter are respectively first polarized light and second polarized light with different polarization states. The polarization beam splitter is configured such that the reflectivity of one of the first polarized light and the second polarized light is greater than its reflectivity to the other; and / or, the polarization beam splitter is configured such that the transmittance of one of the first polarized light and the second polarized light is greater than its transmittance to the other. The display device further includes a polarization conversion structure configured to convert the light corresponding to the second polarized light into a third polarized light, wherein the third polarized light has the same polarization state as the first polarized light.

7. The display device according to any one of claims 1 to 5, wherein The light guide structure includes an optical output section, which includes a first optical output section and a second optical output section. The first optical output section is configured to couple the light corresponding to the first portion of light out from the first light output area, and the second optical output section is configured to couple the light corresponding to the second portion of light out from the second light output area.

8. The display device of claim 6, wherein, The light guide structure includes an optical output section, which includes a first optical output section and a second optical output section. The first optical output section is configured to couple the light corresponding to the first portion of light out from the first light output area, and the second optical output section is configured to couple the light corresponding to the second portion of light out from the second light output area. in, The light rays converted by the polarization conversion structure propagate towards the second optical coupler output section, and the third polarized light obtained by converting the light corresponding to the second polarized light by the polarization conversion structure is emitted from the second light output region; or, The light emitted from the second optical coupler propagates towards the polarization conversion structure, and the light corresponding to the second polarized light is converted into the third polarized light by the polarization conversion structure and emitted from the second light-emitting region; or... In this configuration, the light converted by the polarization conversion structure propagates towards the light guide structure, the third polarized light converted by the polarization conversion structure is incident on the light guide structure, and the third polarized light exits from the second light exit region; or... The polarization conversion structure is located within the light guide structure. The light corresponding to the second polarized light propagates in the light guide structure and is converted into the third polarized light after reaching the polarization conversion structure. The third polarized light is emitted from the second light output region.

9. The display device of claim 6, wherein, The light guide structure includes an optical output section, which comprises a first optical output section and a second optical output section. The first optical output section is configured to couple the light corresponding to the first portion of light from the first light output area, and the second optical output section is configured to couple the light corresponding to the second portion of light from the second light output area. The light guide structure includes a first light guide element and a second light guide element. The light corresponding to the first portion of the light is incident on the first light guide element, which includes a first light-coupled output portion; the light corresponding to the second portion of the light is incident on the second light guide element, which includes a second light-coupled output portion, wherein the first light-coupled output portion and the second light-coupled output portion do not completely overlap in a direction perpendicular to the extending direction of the light guide structure; or... The light guide structure includes a third light guide element and a fourth light guide element. The third light guide element includes a first light output portion and a second light output portion. The first light output portion and the second light output portion do not overlap in a direction perpendicular to the extension direction of the light guide structure. The light corresponding to the first portion of light is incident on the third light guide element and coupled out by the first light coupling part; the light corresponding to the second portion of light is incident on the fourth light guide element, and propagates from the fourth light guide element to the third light guide element, and is coupled out by the second light coupling part.

10. The display device according to any one of claims 1-5, wherein, The light guide structure includes an optical coupler output section, wherein... The optical coupling section includes a transflective element array, which comprises a plurality of transflective elements. At least a portion of the transflective elements in the array are configured to partially reflect and partially transmit light propagating to them, such that a portion of the light is coupled out of the light guide structure while another portion continues to propagate within the light guide structure; or... The optical output section includes at least one of a volume grating, a blazed grating, a prism, and light-emitting dots.

11. The display device according to claim 10, wherein, The light guiding structure further includes a light guiding medium, which is configured to allow light entering the light guiding medium to propagate by total internal reflection and / or non-total internal reflection, and the light coupling part is configured to couple the light propagating in the light guiding medium to a predetermined area.

12. The display device according to any one of claims 1-5, wherein, At least a portion of the second light-emitting region is located on one side of the first light-emitting region along the extension direction parallel to the light guide structure; or, At least a portion of the first light-emitting region is located on one side of the second light-emitting region in the extension direction parallel to the light guide structure.

13. The display device according to any one of claims 1-5, wherein, The divergence angle of at least one of the light corresponding to the first part of the light and the light corresponding to the second part of the light is θ, and the range of θ includes 0 to 20 degrees.

14. The display device according to claim 13, wherein, The light guide structure includes an optical output section, which includes a first optical output section and a second optical output section. The first optical output section is configured to couple the light corresponding to the first portion of light out from the first light output area, and the second optical output section is configured to couple the light corresponding to the second portion of light out from the second light output area. The display device further includes a light homogenizing section, which is configured to reflect light incident on the light homogenizing section at least once so that the light propagates to at least one of the first light coupler section and the second light coupler section.

15. The display device according to claim 6, wherein, The beam splitter includes a polarization beam splitter, which includes a polarization transflection film. The polarization conversion structure includes a phase retardation film, and at least one of the polarization transflection film and the phase retardation film is made of a polymer material.

16. A display device, comprising: A beam splitter is configured to split light incident on the beam splitter into a first part of light and a second part of light with different properties. as well as A light guide structure, the light guide structure including at least a first light-emitting area and a second light-emitting area that do not completely overlap in a direction perpendicular to its extension direction, the light guide structure being configured such that light corresponding to a first portion of light incident on the light guide structure is emitted from the first light-emitting area as a first emitted light, and light corresponding to a second portion of light incident on the light guide structure is emitted from the second light-emitting area as a second emitted light. The light emitted from the first light-emitting area and the second light-emitting area of ​​the light guide structure both include a first wavelength light and a second wavelength light. The energy ratio of the first wavelength light emitted from the first light-emitting area is greater than the energy ratio of the second wavelength light emitted from the first light-emitting area, and the energy ratio of the first wavelength light emitted from the second light-emitting area is less than the energy ratio of the second wavelength light emitted from the second light-emitting area. The display device further includes a light adjustment unit, which is configured to adjust the energy distribution of at least one of the first wavelength light and the second wavelength light in at least one of the light corresponding to the light emitted from the first light-emitting area and the second light-emitting area of ​​the display device before they are emitted from the display device.

17. A head-up display, comprising: The display device according to any one of claims 1-16; as well as A reflective imaging unit is configured to reflect light emitted from the display device to the observation area of ​​the head-up display.

18. A transportation device comprising the head-up display of claim 17, or the display device of any one of claims 1-16.

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