CN119200059A - Optical film and head-up display device - Google Patents
Optical film and head-up display device Download PDFInfo
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- CN119200059A CN119200059A CN202411556057.XA CN202411556057A CN119200059A CN 119200059 A CN119200059 A CN 119200059A CN 202411556057 A CN202411556057 A CN 202411556057A CN 119200059 A CN119200059 A CN 119200059A
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- diffusion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
- B60K35/23—Head-up displays [HUD]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses an optical film and a head-up display device, wherein the optical film is used for reducing ambient light incident to an image generating unit of the display device, the optical film comprises a substrate, a diffusion structure positioned on a first side of the substrate and a light increasing structure positioned on a second side of the substrate, the first side of the substrate is opposite to the second side, light output by the image generating unit is incident from one side of the optical film, on which the diffusion structure is arranged, and converged when the light increasing structure is emergent, the optical film enhances the light output by the image generating unit, the ambient light is incident from one side of the optical film, on which the light increasing structure is arranged, part of the ambient light is reflected by the surface of the light increasing structure, part of the ambient light transmitted by the light increasing structure and the substrate is diffused by the diffusion structure to weaken the intensity and then is incident to the image generating unit. The optical film reduces the ambient light incident to the image generating unit, delays the temperature rise of the image generating unit, and reduces the influence of the sunlight backflow phenomenon on the image generating unit.
Description
Technical Field
The invention relates to the technical field of display, in particular to an optical film and a head-up display device.
Background
The Head Up Display device (HUD) is a visual auxiliary driving system, can provide key auxiliary driving information for a driver, projects driving information into a virtual image, and displays the virtual image at a certain distance in front of the driver, so that the driver can acquire information such as speed, oil quantity and real-time navigation under a Head-Up state, thereby avoiding blind area time generated by looking at the driving information by the driver due to low Head, ensuring that the attention of the driver is more concentrated and improving the driving safety.
HUD is a technique that uses the principle of optical reflection to project the driving information projected by an image generating unit (PGU, picture Generate Unit) through the windshield into the driver's field of view. However, due to the principle of reversible light path, a large amount of sunlight is incident to the surface of the PGU through the light path of the HUD, and when the magnification of the HUD with the concave mirror is too high, high temperature is generated due to the condensation effect, so that the surface temperature of the PGU is raised and even the PGU is burned, that is, the sunlight flows backward, and the driving safety is seriously affected.
Aiming at the problem of sunlight backflow of the HUD, related solutions are urgently needed in the industry so as to reduce the temperature of the PGU and the risk of burning the PGU.
Disclosure of Invention
In view of the above, the present invention provides an optical film and a head-up display device, which can reduce the influence of the sunlight backflow phenomenon on the image generating unit of the display device, and effectively prevent the temperature of the image generating unit from rapidly rising.
The invention provides an optical film for reducing ambient light incident to an image generation unit of a display device, which comprises a substrate, a diffusion structure positioned on a first side of the substrate and a light enhancement structure positioned on a second side of the substrate, wherein the first side and the second side of the substrate are opposite;
The light outputted by the image generating unit enters from one side of the optical film provided with the diffusion structure and is converged when the light intensifying structure exits, and the optical film strengthens the light outputted by the image generating unit;
the ambient light is incident from one side of the optical film provided with the light enhancement structure, part of the ambient light is reflected by the surface of the light enhancement structure, part of the ambient light transmitted by the light enhancement structure and the substrate is diffused by the diffusion structure to weaken the intensity and then is incident to the image generation unit.
Based on the same conception, the invention also provides a head-up display device comprising the optical film.
Compared with the prior art, the optical film and the head-up display device provided by the invention have the advantages that at least the following beneficial effects are realized:
The optical film is used for reducing ambient light entering an image generating unit of a display device, and comprises a substrate, a diffusion structure positioned on a first side of the substrate and a light increasing structure positioned on a second side of the substrate, wherein the first side of the substrate is opposite to the second side, light output by the image generating unit enters from one side of the optical film, where the diffusion structure is arranged, and is converged when exiting from the light increasing structure, the optical film enhances the light output by the image generating unit, the ambient light enters from one side of the optical film, where the light increasing structure is arranged, part of the ambient light is reflected by the surface of the light increasing structure, part of the ambient light transmitted by the light increasing structure and the substrate is diffused by the diffusion structure to weaken the intensity, and then enters the image generating unit. The optical film has the advantages that through reasonably arranging the positions and the structures of the diffusion structure and the light increasing structure, the illumination intensity of light rays output by the image generating unit can be enhanced, the illumination intensity of the ambient light rays incident to the image generating unit can be weakened, the ambient light rays incident to the image generating unit are effectively reduced, the temperature rise of the image generating unit is delayed or inhibited, the influence of the sunlight backflow phenomenon on the image generating unit is reduced, the problems of failure and burning of the image generating unit caused by rapid temperature rise are avoided, and the enhancement of the display effect of the display device is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic top view of an optical film according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 3 is a schematic view of a propagation path of light outputted from an image generating unit corresponding to the optical film shown in FIG. 2;
FIG. 4 is a schematic view of a propagation path of ambient light corresponding to the optical film shown in FIG. 2;
FIG. 5 is a schematic top view of another optical film according to the present invention;
FIG. 6 is a schematic view of a cross-sectional structure along the sectional line BB' in FIG. 5;
FIG. 7 is a schematic view of a propagation path of light outputted from an image generating unit corresponding to the optical film shown in FIG. 6;
FIG. 8 is a schematic view of a propagation path of ambient light corresponding to the optical film shown in FIG. 6;
FIG. 9 is a schematic view of another cross-sectional structure along the line AA' in FIG. 1;
FIG. 10 is a schematic top view of another optical film according to the present invention;
FIG. 11 is a schematic view of a cross-sectional structure taken along the line CC' in FIG. 10;
FIG. 12 is a schematic view of yet another cross-sectional structure along the sectional line AA' in FIG. 1;
FIG. 13 is a schematic top view of another optical film according to the present invention;
FIG. 14 is a schematic cross-sectional view taken along the line DD' in FIG. 13;
Fig. 15 is a schematic structural diagram of a head-up display device according to the present invention;
FIG. 16 is a schematic view of a propagation path of light output by an image generating unit corresponding to the head-up display device shown in FIG. 15;
fig. 17 is a schematic diagram of a propagation path of ambient light corresponding to the head-up display device shown in fig. 15.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The term "comprising" and variants thereof as used herein is intended to be open ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment".
It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between corresponding contents and not for defining a sequential or interdependent relationship.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.
Fig. 1 is a schematic top view of an optical film according to the present invention, fig. 2 is a schematic cross-sectional view along a sectional line AA' in fig. 1, fig. 3 is a schematic light path of light outputted from an image generating unit corresponding to the optical film shown in fig. 2, fig. 4 is a schematic light path of ambient light corresponding to the optical film shown in fig. 2, and as shown in fig. 1-4, the optical film is used for reducing ambient light incident on an image generating unit (not shown in fig. 1-4) of a display device. The optical film comprises a substrate 10, a diffusion structure 20 positioned on a first side of the substrate 10 and a light intensifying structure 30 positioned on a second side of the substrate 10, wherein the first side is opposite to the second side, light rays output by an image generating unit are incident from the side of the optical film, on which the diffusion structure 20 is arranged, and are converged when the light intensifying structure 30 is emergent, light rays output by the image generating unit are enhanced by the optical film, ambient light rays are incident from the side of the optical film, on which the light intensifying structure 30 is arranged, part of the ambient light rays are reflected by the surface of the light intensifying structure 30, and part of the ambient light rays transmitted by the light intensifying structure 30 and the substrate 10 are diffused by the diffusion structure 20 to weaken the intensity and then are incident to the image generating unit.
Specifically, the optical film includes a substrate 10, a diffusion structure 20, and a light enhancement structure 30. The substrate 10 includes a first side and a second side facing away from each other, and the diffusion structure 20 is disposed on the first side of the substrate 10, and the light enhancement structure 30 is disposed on the second side of the substrate 10, that is, the diffusion structure 20 and the light enhancement structure 30 are respectively located on two sides facing away from each other of the substrate 10. And, the light outputted from the image generating unit of the display device may be incident on the first side of the substrate 10 and emitted from the second side of the substrate 10, and the ambient light (including solar light) may be incident on the second side of the substrate 10 and emitted from the first side of the substrate 10 based on the principle of light path reversibility. In other words, the light output by the image generating unit of the display device is opposite to the incident direction of the ambient light with respect to the optical film, and the position of the image generating unit of the display device is not particularly limited and is only drawn and described by taking an example that the light output by the image generating unit is located in the area corresponding to the first side of the substrate 10 and a drawing and description are taken by taking an example that the ambient light is located on the second side of the substrate 10. The display device may be a head-up display device or the like, for example, and in practice, the display device may be a device in which a sunlight backflow phenomenon occurs. The optical film can not only enhance the illumination intensity of the light rays output by the image generating unit, but also weaken the illumination intensity of the ambient light rays incident to the image generating unit by reasonably arranging the positions of the diffusion structure 20 and the light increasing structure 30 and the modulation function of the light rays.
In one embodiment, for the light outputted by the image generating unit, that is, the incident light shown in fig. 3 (the incident light is incident on one side of the optical film relative to the optical film), the incident light may be incident from the side of the optical film where the diffusion structure 20 is disposed, and may be converged when exiting from the side of the optical film where the light enhancement structure 30 is disposed, where the optical film may effectively enhance the illumination intensity of the light outputted by the image generating unit. Illustratively, the diffusion structure 20 may not affect the propagation direction of the light outputted from the image generating unit, and sequentially emit the light outputted from the image generating unit to the substrate 10 and the light intensifying structure 30. Illustratively, the diffusion structure 20 may uniformly project the light outputted from the image generating unit to the substrate 10 and the light intensifying structure 30 after being dispersed. Illustratively, the light enhancement structure 30 may convert the light outputted from the more divergent image generating unit into the planar light with relatively concentrated brightness, that is, perform the converging process on the light outputted from the image generating unit, so as to enhance the brightness of the light outputted from the image generating unit. That is, the arrangement of the optical film does not affect the normal use of the image generating unit of the display device.
In another embodiment, for ambient light, i.e., the incident light shown in fig. 4 (the incident light is incident on one side of the optical film with respect to the optical film), the incident light is incident from the side of the optical film where the light enhancement structure 30 is disposed, part of the ambient light is reflected by the surface of the light enhancement structure 30, part of the ambient light is transmitted through the light enhancement structure 30 and the substrate 10, and exits on the side of the optical film where the diffusion structure 20 is disposed. Wherein, because part of the ambient light can be reflected by the surface of the intensifying structure 30, the accumulation of the ambient light on the surface of the intensifying structure 30 is restrained, the ambient light incident to the image generating unit is effectively reduced, and the blocking effect on the part of the ambient light incident to the image generating unit is realized. And, the diffusion structure 20 can also diffuse part of the ambient light transmitted by the light enhancement structure 30 and the substrate 10, so as to weaken the illumination intensity of the part of ambient light, further reduce the illumination intensity of the ambient light incident on the image generation unit, delay or inhibit the temperature rise of the image generation unit, and be beneficial to achieving the purpose of reducing the sunlight backflow. That is, the arrangement of the optical film can effectively solve the problem that the convergence temperature of the ambient light to the normal use of the image generating unit of the display device is increased.
According to the technical scheme, the positions and the structures of the diffusion structure and the light increasing structure are reasonably arranged, so that the illumination intensity of light rays output by the image generating unit can be enhanced, the illumination intensity of the ambient light rays incident to the image generating unit can be weakened, the ambient light rays incident to the image generating unit can be effectively reduced, the temperature rise of the image generating unit is delayed or inhibited, the influence of the sunlight backflow phenomenon on the image generating unit is reduced, the problem that the image generating unit fails and burns due to rapid temperature rise is avoided, and the display effect of the display device is enhanced.
Alternatively, fig. 5 is a schematic top view of another optical film according to the present invention, fig. 6 is a schematic cross-sectional view of the optical film along a sectional line BB' in fig. 5, fig. 7 is a schematic light path of light outputted from an image generating unit corresponding to the optical film shown in fig. 6, fig. 8 is a schematic light path of ambient light corresponding to the optical film shown in fig. 6, and as shown in fig. 5-8, the optical film further includes a unidirectional light-transmitting material layer 40 disposed on a side of the light-intensifying structure 30 away from the substrate 10, where the unidirectional light-transmitting material layer 40 is used for blocking and reflecting the ambient light.
Specifically, the optical film further includes a unidirectional light-transmitting material layer 40 disposed on a side of the light-enhancing structure 30 away from the substrate 10. Illustratively, as shown in fig. 7, the unidirectional light-transmitting material layer 40 may not affect the propagation direction of the light outputted from the image generating unit, that is, the light outputted from the converged image generating unit that is emitted through the light-increasing structure 30, and the unidirectional light-transmitting material layer 40 may transmit the light outputted from the converged image generating unit. Fig. 7 also schematically shows an optical path diagram of the light intensifying principle of the light intensifying structure 30, and the light intensifying structure 30 achieves the light intensifying effect by multiple reflection and refraction. Specifically, referring to the light in the left area of fig. 7, the incident angle of the light is smaller (the incident angle is smaller than the total reflection angle, for example), so that there is both the corresponding reflected light and the corresponding refracted light, in the left area of fig. 7, only the propagation path of the corresponding reflected light is shown, that is, the light in the left area of fig. 7 is repeatedly reflected through the intensifying structure 30, about 50% of the incident light is recycled and is refracted and output when passing through the output interface, referring to the light in the middle area of fig. 7, the incident angle of the light is smaller (the incident angle is smaller than the total reflection angle, for example), so that there is both the corresponding reflected light and the corresponding refracted light, in the middle area of fig. 7, only the propagation path of the corresponding refracted light is shown, that is, in the middle area of fig. 7, the light in the part of angle is refracted once through the exit surface of the intensifying structure 30, and the available refracted light is increased by 40% -70%, and in the right area of fig. 7, the incident angle of the light is greater than the total reflection angle, so that the total reflection occurs and the refracted light passes through the exit surface of the other exit surface, and the total reflection structure. It should be noted that, fig. 7 only schematically illustrates the transmission principle of the light in the light enhancement structure 30, so that transmission processes of light with different angles are illustrated in different prism positions, and in the actual light transmission process, since each prism position has light with different angles, repeated reflection and refraction processes occur in each prism position. In other words, a part of light rays can be refracted out from the side of the optical film where the diffusion structure 20 is disposed and the other part of light rays are reflected in the dielectric material of the optical film, and the part of light rays have reduced reflection angle and refraction angle and are then refracted out again, so as to realize the brightness enhancement effect.
And, by way of example, comparing the propagation paths of the ambient light shown in fig. 4 and 8, it can be obtained that the unidirectional light-transmitting material layer 40 can affect the propagation direction of the ambient light, that is, the ambient light is reflected after entering the unidirectional light-transmitting material layer 40, but not entering the image generating unit, so that the ambient light is prevented from accumulating on the surface of the image generating unit. That is, the unidirectional light-transmitting material layer 40 does not affect the display effect of the image generating unit of the display device, can also play a role in blocking and reflecting the ambient light, can further reduce the internal temperature of the image generating unit, and avoids the situation that the temperature of the image generating unit is severely raised due to the incidence of the ambient light on the surface of the image generating unit.
In a specific embodiment, for the light outputted by the image generating unit, that is, the incident light shown in fig. 7, the incident light may be incident from the side of the optical film provided with the diffusion structure 20, and exit from the side of the optical film provided with the unidirectional light-transmitting material layer 40, the light outputted by the converged image generating unit exiting through the light-increasing structure 30, and the unidirectional light-transmitting material layer 40 may transmit and exit the light outputted by the converged image generating unit.
In another embodiment, for ambient light, i.e., the incident light shown in fig. 8, the ambient light is incident from the side of the optical film on which the unidirectional light transmissive material layer 40 is disposed, and the ambient light is reflected by the surface of the unidirectional light transmissive material layer 40. In addition, there may be some ambient light transmitted through the unidirectional light transmissive material layer 40, the light enhancement structure 30, and the substrate 10, exiting and scattering at the side of the optical film where the diffusion structure 20 is disposed. That is, since the ambient light can be reflected by the surface of the unidirectional light-transmitting material layer 40, the accumulation of the ambient light on the surface of the unidirectional light-transmitting material layer 40 is suppressed, the ambient light incident to the image generating unit is effectively reduced, and the blocking effect of the ambient light incident to the image generating unit is realized.
Further, with continued reference to fig. 5-8, the unidirectional light transmissive material layer 40 includes a unidirectional light transmissive film 41 disposed on a surface of the light enhancement structure 30. Or fig. 9 is a schematic view of another cross-sectional structure along the line AA' in fig. 1, and as shown in fig. 9, the unidirectional light transmissive material layer 40 includes unidirectional light transmissive particles 42 disposed inside the light enhancement structure 30. Or fig. 10 is a schematic top view of another optical film according to the present invention, and fig. 11 is a schematic cross-sectional view along the line CC' in fig. 10, where, as shown in fig. 10 and 11, the unidirectional light-transmitting material layer 40 includes unidirectional light-transmitting particles 42 disposed on the surface of the light-intensifying structure 30.
Specifically, in one embodiment, the unidirectional light transmissive material layer 40 shown in fig. 5-8 includes a unidirectional light transmissive film 41 disposed on the surface of the light enhancement structure 30. Illustratively, the unidirectional light transmissive film 41 may cover a surface of the light enhancement structure 30 on a side thereof remote from the substrate 10. Illustratively, the unidirectional light-transmitting film 41 may planarize a surface of the light-intensifying structure 30 on a side remote from the substrate 10. The thickness of the unidirectional light transmitting film 41 in this embodiment is not particularly limited and is not particularly limited.
In another embodiment, the unidirectional light transmissive material layer 40 shown in fig. 9 includes unidirectional light transmissive particles 42 disposed within the light enhancement structure 30. Illustratively, the unidirectional light transmissive particles 42 may be embedded within the interior of the light enhancement structure 30. Or the unidirectional light transmissive material layer 40 shown in fig. 10 and 11 includes unidirectional light transmissive particles 42 disposed on the surface of the light enhancement structure 30. Illustratively, the unidirectional light transmissive particles 42 may also be disposed dispersed on the surface of the light enhancement structure 30. The dispersion density and specific positions of the unidirectional light transmitting particles 42 in this embodiment are not particularly limited and are not particularly limited herein. It is understood that the unidirectional light-transmitting particles 42 may be disposed inside the light-intensifying structure 30 or on the surface of the light-intensifying structure 30, and in fact, in another embodiment, the unidirectional light-transmitting particles 42 may be disposed only inside the light-intensifying structure 30, and in yet another embodiment, the unidirectional light-transmitting particles 42 may be disposed only on the surface of the light-intensifying structure 30, which is not illustrated in any more detail in this embodiment.
Alternatively, with continued reference to fig. 2-4, 6-8, the diffusion structure 20 includes a diffusion substrate 21 and diffusion particles 22. Further, diffusion particles 22 are located on the surface of diffusion substrate 21. Or fig. 12 is a schematic view of another cross-sectional structure along the line AA' in fig. 1, and as shown in fig. 12, the diffusion particles 22 are located inside the diffusion substrate 21.
Specifically, in one embodiment, the diffusion particles 22 shown in fig. 2 and 6 are located on the surface of the diffusion substrate 21. Illustratively, the diffusion substrate 21 may be positioned on a first side of the base 10, and the diffusion particles 22 may overlie a surface of the diffusion substrate 21 on a side remote from the base 10. Illustratively, the diffusion particles 22 may be dispersed on the surface of the diffusion substrate 21. The diffusion substrate 21 may serve as a support, and the diffusion particles 22 may serve as a diffusion for light. The shape and distribution of the diffusion particles 22 in this embodiment are not particularly limited and are not particularly limited. When the ambient light transmitted through the substrate 10 passes through the diffusion substrate 21 and the diffusion particles 22, the diffusion particles 22 can refract, reflect and scatter the ambient light to achieve optical diffusion, so as to further weaken the illumination intensity of the ambient light incident on the image generating unit.
In another embodiment, the diffusion particles 22 shown in fig. 12 are located inside the diffusion substrate 21. Illustratively, the diffusion substrate 21 may be positioned on a first side of the base 10, and the diffusion particles 22 may be embedded within the diffusion substrate 21. Illustratively, the diffusion particles 22 may be disposed dispersed within the diffusion substrate 21. The diffusion substrate 21 may serve as a support, and the diffusion particles 22 may serve as a diffusion for light. The shape and distribution of the diffusion particles 22 in this embodiment are not particularly limited and are not particularly limited. When the ambient light transmitted through the substrate 10 passes through the diffusion substrate 21 and the diffusion particles 22, the diffusion particles 22 can refract, reflect and scatter the ambient light to achieve optical diffusion, so as to further weaken the illumination intensity of the ambient light incident on the image generating unit. It will be appreciated that the diffusing particles 22 shown in fig. 2 and 6 are located only on the surface of the diffusing substrate 21, and that the diffusing particles 22 shown in fig. 12 are located only inside the diffusing substrate 21, and in fact, in yet another embodiment, the diffusing particles 22 may be located on both the surface of the diffusing substrate 21 and inside the diffusing substrate 21, which is not illustrated in any way.
Optionally, with continued reference to fig. 1 and 2, along the first direction X, the projection of the light enhancing structure 30 on the first plane (YZ plane) is in a sawtooth shape, where the sawtooth shape includes a triangle shape, the first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction X, and the first direction X is parallel to the extending direction of one of the sawteeth in the sawtooth shape. Or fig. 13 is a schematic top view of another optical film according to the present invention, and fig. 14 is a schematic cross-sectional view of the optical film along a line DD' in fig. 13, as shown in fig. 13 and 14, a projection of the light enhancing structure 30 on a first plane is a saw-tooth shape, the saw-tooth shape includes a rounded corner shape, the first plane is perpendicular to a plane of the optical film, the first plane is perpendicular to the first direction X, and the first direction X is parallel to an extending direction of one saw tooth of the saw-tooth shapes.
Specifically, along the first direction X, the projection of the light enhancing structure 30 on the first plane is in a sawtooth shape, the first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction X, and the first direction X is parallel to the extending direction of one sawtooth in the sawtooth shape. The first plane is understood to be a cross section of the light enhancement structure 30, i.e. the first plane is parallel to the paper surface, and fig. 2-4 show the projection of the optical film on the first plane. The saw-tooth shape of the light-increasing structure 30 may change the refraction or reflection angle of the light, that is, the saw-tooth shape may effectively increase the brightness of the light outputted from the image generating unit. And, the second direction Y may be understood as a thickness direction of the light enhancing structure 30, and the third direction Z may be understood as a horizontal extending direction of the light enhancing structure 30.
In one embodiment, the saw tooth shape of the light enhancement structure 30 shown in fig. 2 and 6 is triangular. Illustratively, one serration of the triangular shape extends in a direction parallel to the first direction X. In another embodiment, the saw tooth shape of the light enhancement structure 30 shown in fig. 14 is rounded. Illustratively, one serration extension direction of the rounded shape is parallel to the first direction X. It will be appreciated that the specific shape and size of the saw tooth shape can be reasonably set according to the refraction and reflection requirements of the light, and the embodiment is not particularly limited and specifically required herein.
Alternatively, with continued reference to fig. 1-14, the material of the light enhancement structure 30 comprises a resin material.
Specifically, the resin material has the characteristic of easy molding, and is favorable for forming a specific structure of the saw tooth shape of the intensifying structure 30.
Alternatively, with continued reference to fig. 1-14, the light enhancement structure 30 is attached to a surface of the second side of the substrate 10 and the diffusion structure 20 is attached to a surface of the first side of the substrate 10. Thus, the substrate 10, the diffusion structure 20 and the light enhancement structure 30 are formed as a single body. Illustratively, the substrate 10 and the diffusion structure 20 may be fixedly attached together by an adhesive material having excellent light transmittance such as silicone, acrylic resin, unsaturated polyester, polyurethane and epoxy resin. Illustratively, the substrate 10 and the light enhancement structure 30 may be fixedly attached together by an adhesive material with excellent light transmission properties, such as silicone, acrylic resin, unsaturated polyester, polyurethane, and epoxy resin.
Alternatively, with continued reference to fig. 1-14, the substrate 10 and the light enhancement structure 30 are of the same material. Further, the substrate 10 and the light enhancement structure 30 are a unitary structure.
Specifically, the light enhancement structure 30 is attached to the surface of the second side of the substrate 10, the substrate 10 and the light enhancement structure 30 may be made of the same material, and the substrate 10 and the light enhancement structure 30 may be an integral structure. In this way, the stability between the substrate 10 and the intensifying structure 30 can be further ensured, and the risks of peeling and falling off between the substrate 10 and the intensifying structure 30 are avoided. Illustratively, the light enhancement structure 30 may be formed directly on the substrate 10 via a mold fabrication or the like. Illustratively, the material of the substrate 10 may include polyethylene terephthalate PET, polycarbonate PC, polymethyl methacrylate PMMA, or the like.
In another embodiment, the diffusion structure 20 is attached to the surface of the first side of the substrate 10, the substrate 10 and the diffusion structure 20 may be made of the same material, and the substrate 10 and the diffusion structure 20 may be a unitary structure. In this way, the stability between the substrate 10 and the diffusion structure 20 can be further ensured, and the risks of peeling and falling off between the substrate 10 and the diffusion structure 20 are avoided. Illustratively, the diffusion structure 20 may be formed directly on the substrate 10 via etching or the like. It is understood that in yet another embodiment, the diffusion structure 20 is attached to the surface of the first side of the substrate 10, the light enhancing structure 30 is attached to the surface of the second side of the substrate 10, the diffusion structure 20 and the light enhancing structure 30 may all be made of the same material, and the substrate 10, the diffusion structure 20 and the light enhancing structure 30 may be an integral structure. In this way, the stability among the substrate 10, the diffusion structure 20 and the intensifying structure 30 can be further ensured, and the risks of peeling and falling off among the substrate 10, the diffusion structure 20 and the intensifying structure 30 are avoided. Illustratively, the step of attaching the diffusion structure 20 and the intensifying structure 30 to the surface of the substrate 10 may be omitted by directly forming the diffusion structure 20 on one side of the substrate 10 via etching or the like, and directly forming the intensifying structure 30 on the other side of the substrate 10 via etching or the like.
Based on the same inventive concept, the embodiment of the invention also provides a head-up display device. Fig. 15 is a schematic structural diagram of a head-up display device according to the present invention, and as shown in fig. 15, the head-up display device includes any one of optical films 100 according to an embodiment of the present invention. Therefore, the head-up display device provided by the embodiment of the present invention has the corresponding beneficial effects of the optical film 100 provided by the embodiment of the present invention, and will not be described herein. The head-up display device may be an electronic device such as a vehicle-mounted display device, which is not limited in the embodiment of the present invention.
Optionally, fig. 16 is a schematic diagram of a propagation light path of a light ray output by an image generating unit corresponding to the head-up display device shown in fig. 15, and fig. 17 is a schematic diagram of a propagation light path of an ambient light ray corresponding to the head-up display device shown in fig. 15, and as shown in fig. 15 to 17, the head-up display device further includes an image generating unit 200, and the optical film 100 is attached to a light emitting surface of the image generating unit 200. The image generation unit 200 may generate an image and control brightness. In addition, the head-up display device further includes at least one mirror 300, and the image light outputted from the image generating unit 200 is converged by the optical film 100, reflected by the mirror 300 and the windshield 400, and then is incident to the human eye.
Specifically, the reflecting mirror 300 includes a first curved reflecting mirror 301 and a second curved reflecting mirror 302, and the image light outputted from the image generating unit 200 is converged by the optical film 100, reflected by the first curved reflecting mirror 301, the second curved reflecting mirror 302 and the windshield 400 in order, and then is incident to the human eye. Illustratively, the first curved mirror 301 and/or the second curved mirror 302 may be free-form curved mirrors, the first curved mirror 301 and the second curved mirror 302 may reduce aberration caused by radian of the windshield 400, the first curved mirror 301 and the second curved mirror 302 may further enlarge a screen, the windshield 400 may further enlarge the screen again, and after eliminating the ghost, reflect the image to human eyes, which is beneficial to improving the image display effect of the head-up display device. As an example, fig. 16 may be understood as a schematic view of an optical path of light incident on a human eye after light outputted from the image generating unit 200 is sequentially reflected by the first curved mirror 301, the second curved mirror 302, and the windshield 400, fig. 17 may be understood as a schematic view of an optical path of light incident on the image generating unit 200 after the ambient light is sequentially reflected by the windshield 400, the second curved mirror 302, and the first curved mirror 301, and it is apparent that the optical film 100 may perform convergence processing on the light outputted from the image generating unit 200 to enhance the brightness of the light outputted from the image generating unit 200, the optical film 100 may also block and reflect the ambient light, reduce the ambient light incident on the image generating unit 200, and the optical film 100 may perform diffusion processing on the transmitted ambient light to weaken the illumination intensity of the ambient light, and further reduce the illumination intensity of the ambient light incident on the image generating unit 200. Thus, the influence of the sunlight backflow phenomenon on the image generation unit 200 is effectively solved, and the normal use of the head-up display device is also ensured.
According to the embodiment, the optical film and the head-up display device provided by the invention have the following beneficial effects:
The optical film is used for reducing ambient light entering an image generating unit of a display device, and comprises a substrate, a diffusion structure positioned on a first side of the substrate and a light increasing structure positioned on a second side of the substrate, wherein the first side of the substrate is opposite to the second side, light output by the image generating unit enters from one side of the optical film, where the diffusion structure is arranged, and is converged when exiting from the light increasing structure, the optical film enhances the light output by the image generating unit, the ambient light enters from one side of the optical film, where the light increasing structure is arranged, part of the ambient light is reflected by the surface of the light increasing structure, part of the ambient light transmitted by the light increasing structure and the substrate is diffused by the diffusion structure to weaken the intensity, and then enters the image generating unit. The optical film has the advantages that through reasonably arranging the positions and the structures of the diffusion structure and the light increasing structure, the illumination intensity of light rays output by the image generating unit can be enhanced, the illumination intensity of the ambient light rays incident to the image generating unit can be weakened, the ambient light rays incident to the image generating unit are effectively reduced, the temperature rise of the image generating unit is delayed or inhibited, the influence of the sunlight backflow phenomenon on the image generating unit is reduced, the problems of failure and burning of the image generating unit caused by rapid temperature rise are avoided, and the enhancement of the display effect of the display device is realized.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (12)
1. An optical film for reducing ambient light incident to an image generation unit of a display device, the optical film comprising a substrate, a diffusion structure on a first side of the substrate, and a light enhancement structure on a second side of the substrate, the first side of the substrate being opposite the second side;
the light rays output by the image generation unit are incident from one side of the optical film, on which the diffusion structure is arranged, and are converged when the light enhancement structure is emergent, and the optical film enhances the light rays output by the image generation unit;
The ambient light is incident from one side of the optical film, on which the light enhancement structure is arranged, part of the ambient light is reflected by the surface of the light enhancement structure, passes through the light enhancement structure and part of the ambient light transmitted by the substrate, and is incident to the image generation unit after being diffused and weakened in intensity by the diffusion structure.
2. The optical film of claim 1, further comprising a layer of unidirectional light transmissive material disposed on a side of the light enhancement structure remote from the substrate, the layer of unidirectional light transmissive material configured to block and reflect ambient light.
3. The optical film of claim 2, wherein the unidirectional light transmissive material layer comprises unidirectional light transmissive films disposed on a surface of the light enhancement structure or unidirectional light transmissive particles disposed within or on a surface of the light enhancement structure.
4. The optical film according to claim 1, wherein the diffusion structure comprises a diffusion substrate and diffusion particles.
5. The optical film according to claim 4, wherein the diffusion particles are located on the surface of the diffusion substrate or the diffusion particles are located inside the diffusion substrate.
6. The optical film according to claim 1, wherein the projection of the light enhancement structure on a first plane along a first direction is a saw-tooth shape, the saw-tooth shape comprises a triangle shape or a rounded corner shape, the first plane is perpendicular to the plane of the optical film, the first plane is perpendicular to the first direction, and the first direction is parallel to an extending direction of one saw tooth in the saw-tooth shape.
7. The optical film according to claim 1, wherein the material of the light-increasing structure comprises a resin material.
8. The optical film of claim 7, wherein the light enhancement structure is attached to a surface of the second side of the substrate and the diffusion structure is attached to a surface of the first side of the substrate.
9. The optical film according to claim 1, wherein the substrate and the light enhancement structure are made of the same material.
10. The optical film according to claim 9, wherein the substrate and the light enhancement structure are a unitary structure.
11. A head-up display device comprising the optical film of any one of claims 1-10.
12. The head-up display device according to claim 11, further comprising an image generation unit;
The optical film is attached to the light-emitting surface of the image generation unit.
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| CN202411556057.XA CN119200059A (en) | 2024-10-31 | 2024-10-31 | Optical film and head-up display device |
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| CN202411556057.XA CN119200059A (en) | 2024-10-31 | 2024-10-31 | Optical film and head-up display device |
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| CN115343790A (en) * | 2022-08-04 | 2022-11-15 | 武汉华星光电技术有限公司 | Optical film and display device |
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| CN108267804A (en) * | 2018-03-05 | 2018-07-10 | 深圳市光科全息技术有限公司 | A kind of optical film |
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