WO2016136827A1 - 透過型スクリーン及びそれを用いたヘッドアップディスプレイ装置 - Google Patents
透過型スクリーン及びそれを用いたヘッドアップディスプレイ装置 Download PDFInfo
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- WO2016136827A1 WO2016136827A1 PCT/JP2016/055487 JP2016055487W WO2016136827A1 WO 2016136827 A1 WO2016136827 A1 WO 2016136827A1 JP 2016055487 W JP2016055487 W JP 2016055487W WO 2016136827 A1 WO2016136827 A1 WO 2016136827A1
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- light
- microlens array
- substrate
- diffusion
- transmissive screen
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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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
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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
-
- 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
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
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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
-
- 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
- G02B5/0221—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 the surface having an irregular structure
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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
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
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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
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/10—Projectors with built-in or built-on screen
Definitions
- the present invention relates to a transmissive screen that can suppress a decrease in luminance at the periphery of an image and a head-up display device using such a transmissive screen.
- a head up display (HUD) device for a vehicle is superimposed on the other side of the front windshield glass as viewed from the driver, that is, superimposed on the foreground of the front field of view, for example, speed display and navigation. Display as a virtual image.
- HUD head up display
- the driver's line-of-sight movement can be reduced as much as possible when visually confirming driving information.
- MLA microlens array
- the reason why the microlens array is used as the transmissive screen member is that the intensity of the emitted light can be made uniform within a certain emission angle range.
- the intensity of the emitted light can be made uniform within a certain emission angle range.
- Patent Document 1 Japanese Patent No. 5149446 discloses a light source, a first microlens array unit in which a plurality of microlenses are arranged, and An optical element having a second microlens array section, wherein the first microlens array section and the second microlens array section are arranged in the first microlens array section. Disclosed is a lens that is disposed opposite to each other at a distance that is longer than the focal length of the microlens. Japanese Patent No. 5149446
- the head-up display including a transmissive screen using the two microlens arrays described in Patent Document 1 it is possible to suppress the occurrence of excessive pixel bright spots.
- a transmissive screen using two microlens arrays the uniformity of the emitted light emitted from the transmissive screen is impaired and the sharpness of the image is lost (resolution is reduced). There was a problem.
- the present invention is for solving the above-described problems, and a transmission screen according to the present invention includes a microlens array substrate having a first surface provided with a microlens array including a plurality of microlenses.
- a light diffusing substrate having a second surface provided with a light diffusing surface, a first surface of the microlens array substrate provided with the microlens array, and the light diffusing substrate The second surface provided with the light diffusing surface is disposed to face the second surface.
- the transmission screen according to the present invention is characterized in that a facing interval between the microlens array substrate and the light diffusion substrate is 0 ⁇ m or more and 100 ⁇ m or less.
- the microlens array is arranged in a first direction and a second direction intersecting the first direction, and a diffusion angle in the first direction of the microlens array substrate. And the diffusion angle in the second direction of the microlens array substrate is different.
- the transmission screen according to the present invention is characterized in that a diffusion angle of the light diffusing substrate is 5 ° or more and 6 ° or less.
- the transmission screen according to the present invention is characterized in that the light diffusing surface is formed of fine irregularities.
- the transmission screen according to the present invention is characterized in that the period of the unevenness is random.
- the head-up display device is characterized in that any one of the transmission screens described above is used.
- the head-up display device includes a laser light source that generates laser light and a scanning unit that scans the laser light onto the transmission screen.
- the head-up display device includes a light source that generates light, and an LCOS element that reflects the light to the transmission screen.
- the head-up display device includes a light source that generates light, and a DMD element that reflects the light to the transmission screen.
- the transmissive screen according to the present invention can maintain the sharpness of an image without impairing the uniformity of the luminance of emitted light, as compared with a screen using two microlens arrays.
- the head-up display device can maintain the sharpness of luminance without impairing the uniformity of the image.
- FIG. 1 It is a figure showing vehicle 5 carrying head up display device 100 concerning an embodiment of the present invention. It is a figure which shows the structure of the head-up display apparatus 100 which concerns on embodiment of this invention. It is a figure which extracts and shows the transmissive screen 40 concerning the embodiment of the present invention. It is a figure which extracts and shows the transmissive screen 40 which concerns on other embodiment of this invention. It is a figure which shows a mode that the superimposed image display of the information was performed with the head-up display apparatus 100 which concerns on embodiment of this invention. It is the perspective view which expanded and showed the opposing space
- FIG. 1 is a diagram showing a vehicle 5 equipped with a head-up display device 100 according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of the head-up display device 100 according to the embodiment of the present invention. Note that the drawings described below are schematic views and may differ from actual shapes, dimensions, and arrangements.
- a head-up display device 100 is mounted on a vehicle 5 or the like, and is attached to a windshield 6 or a combiner (not shown) provided between a driver and the windshield 6.
- speed information display, navigation information display, and the like By projecting speed information display, navigation information display, and the like as a virtual image from the projection unit 85, the virtual image is superimposed on the foreground of the front field of view.
- FIG. 5 is a diagram showing a state in which a superimposed image display of information is performed by the head-up display device 100 according to the embodiment of the present invention.
- FIG. 5 is an example of an image of the windshield 6 viewed from the viewpoint E from the driver of the vehicle 5.
- FIG. 2 mainly shows an example of the structure of the projection unit 85 of the head-up display device 100 according to the embodiment of the present invention.
- the coordinates in the projection unit 85 are defined by xyz three-dimensional orthogonal coordinates shown in FIG.
- the light emitted from the first light source 11 is light emitted in a direction parallel to the x direction.
- the optical axis of the transmissive screen 40 is in a direction parallel to the z direction.
- the optical axis of the transmissive screen 40 is a method of the principal surface passing through the center of gravity of the microlens array 54 on the principal surface on which the microlens array 54 of the microlens array substrate 50 constituting a part of the transmissive screen 40 is formed. Define a line.
- the transmission screen 40 includes a microlens array substrate 50 and a light diffusion substrate 60.
- the detailed configuration of such a transmission screen 40 will be described later.
- the direction of the axis parallel to the x-axis may be referred to as a first direction
- the direction of the axis parallel to the y-axis may be referred to as a second direction (or perpendicular to the first direction).
- the layout in which the first direction is the vertical direction and the second direction is the horizontal direction is described as an example, but the arrangement of the transmissive screen 40 in the head-up display device 100 is described. The form is not limited to such a layout.
- the light of the displayed image is emitted from the projection unit 10.
- the projection unit 10 includes a first light source 11, a second light source 12, a third light source 13, a first dichroic prism 21, a second dichroic prism 22, a collimator lens 26, and the like.
- the first light source 11, the second light source 12, and the third light source 13 emit light having different wavelengths.
- the first light source 11 emits light of the first wavelength
- the second light source 12 emits the second light.
- the third wavelength light is emitted from the third light source 13.
- the first wavelength light emitted from the first light source 11 is blue light
- the second wavelength light emitted from the second light source 12 is green light
- the third light source is red light.
- the first light source 11 As the first light source 11, the second light source 12, and the third light source 13, various laser devices such as a semiconductor laser device (laser light source) that emits laser light as coherent light can be used.
- a semiconductor laser device laser light source
- the first wavelength light emitted from the first light source 11 and the second wavelength light emitted from the second light source 12 are respectively incident on different surfaces of the first dichroic prism 21.
- the light of the third wavelength emitted from the third light source 13 is disposed so as to enter the second dichroic prism 22.
- the first wavelength light emitted from the first light source 11 is transmitted, and the second wavelength light emitted from the second light source 12 is reflected. Thereby, the light of the first wavelength and the light of the second wavelength are combined.
- the light with the first wavelength and the light with the second wavelength combined in this way enter the second dichroic prism 22.
- the first wavelength light emitted from the first light source 11 and the second wavelength light emitted from the second light source 12 are transmitted, and the first light emitted from the third light source 13 is transmitted.
- Light of wavelength 3 is reflected. Thereby, the light of the first wavelength, the light of the second wavelength, and the light of the third wavelength are combined.
- the projection mirror 30 has a function capable of changing the angle two-dimensionally, whereby the incident light can be scanned two-dimensionally, and a projection image by a desired laser beam is formed.
- the projection mirror 30 further moves along a (a) direction that rotates about a first axis (not shown) parallel to the y-axis, and a second axis (not shown) orthogonal to the first axis. ) About the direction of (b).
- the projection mirror 30 can be appropriately replaced with another optical member as long as it can scan incident light in a two-dimensional manner.
- a galvanometer can be used as such an optical member.
- a mirror, a galvanometer scanner, a polygon mirror, a prism, an acoustooptic device, an optical device using MEMS (Micro Electro Mechanical System) technology, and the like can be used as appropriate.
- MEMS Micro Electro Mechanical System
- the point at which the laser light is incident on and reflected from the projection mirror 30 coincides with the point where the optical axis of the transmissive screen 40 and the projection mirror 30 intersect with each other.
- the transmissive screen 40 and the reflection point r 0 of the laser light and the optical path length between the scanning point s 1 at the lowermost end of the reflection point r 0 of the laser light in the projection mirror 30 transmissive screen 40 in The optical path length between the scanning point s 2 is equal.
- the transmission screen 40 includes a microlens array substrate 50 and a light diffusion substrate 60, and laser light emitted from the projection mirror 30 is transmitted to the microlens array substrate of the transmission screen 40. 50 is scanned.
- the transmissive screen 40 is an optical member made of a transparent substrate having a predetermined or higher transmittance.
- the transmission screen 40 can be configured by molding using an organic resin material, or can be configured by using an inorganic material such as glass.
- FIG. 3 is a diagram showing a transmissive screen 40 extracted from the embodiment of the present invention.
- FIG. 6 is an enlarged perspective view showing a facing distance between the microlens array substrate 50 and the light diffusion substrate 60 of the transmission screen 40 according to the embodiment of the present invention.
- the direction of the axis parallel to the x axis is defined as the first direction
- the direction of the axis parallel to the y axis is defined as the second direction (orthogonal relationship with the first direction).
- the transmissive screen 40 has a main surface extending in a first direction and a second direction orthogonal to the first direction.
- the microlens array substrate 50 includes a first main surface 51 (hereinafter also referred to as a first surface) of the microlens array substrate 50 and a second main surface 52 (hereinafter also referred to as a third surface) of the microlens array substrate 50.
- the first surface 51 is provided with a microlens array 54 in which a plurality of microlenses 53 are periodically arranged, and the third surface 52 is a smooth surface 55.
- the microlens array substrate 50 is made of a transparent substrate.
- the smooth surface said here means the surface which is not processed structurally like the micro lens provided in the 1st surface.
- FIG. 7 is a view of the microlens array 54 spreading in the first direction and the second direction as viewed from the z-axis direction.
- a microlens 53 having a square shape with one side having a length d is used when viewed from the z-axis direction.
- the pitch at which the microlenses 53 are arranged is preferably equal in the first direction and the second direction. This is because the arrangement of the microlenses 53 is dense so as to reduce the linearly transmitted light.
- Each microlens 53 is a spherical lens or aspherical lens, the first surface 51 side vertices of have a curvature radius of curvature R 1 in the first direction, the radius of curvature R 2 in the second direction Has curvature.
- the apex means a point where each micro lens 53 protrudes most in the z-axis direction.
- the cross-sectional shape of the surface of each microlens 53 that is parallel to the first direction and includes the optical axis of the microlens 53 is a surface that is parallel to the second direction and includes the optical axis of the microlens 53. It is preferable to make it different from the cross-sectional shape in FIG. More specifically, the radius of curvature R 1 vertices in the first direction of the first surface 51 side of each microlens 53, it is also possible to equalize the radius of curvature R 2 of the second direction, it is varied preferable.
- the aspect ratio of the image information displayed on the head-up display device 100 is different, and suppression of luminance reduction in the peripheral portion of the image is suppressed between the periphery of the upper and lower end portions of the image and the periphery of the left and right end portions of the image. to the same extent, because each curvature of the first direction in the first surface 51 side apex of the microlens 53 and the radius R 1, it is better to the curvature radius R 2 of the second direction are different.
- the curvature radius R 1 in the first direction at the apex of each microlens 53 on the first surface 51 side is The radius of curvature R 2 in the second direction is preferably larger.
- the head-up display using a laser light source as the transmission screen of the head-up display device 100 has an advantage that speckle noise due to laser light is suppressed by using the microlens array 54.
- the light diffusing substrate 60 has a first main surface 61 (hereinafter also referred to as a second surface) and a second main surface 62 (hereinafter also referred to as a fourth surface).
- a diffusion surface 64 is provided, and the fourth surface 62 is a smooth surface 65.
- the light diffusing surface 64 is composed of fine irregularities having a random period.
- the light-diffusion surface 64 is similar to ground glass, for example, It is configured by providing fine scratches on a smooth surface.
- the smooth surface of the 4th surface 62 said here means the surface in which the structure like the fine unevenness
- the surface 61 is disposed opposite to the surface 61. Further, the facing distance between the microlens array substrate 50 and the light diffusion substrate 60 is preferably 0 ⁇ m or more and 100 ⁇ m or less.
- the above-mentioned facing interval refers to the distance between the portion of the microlens substrate 50 closest to the light diffusion substrate 60 and the portion of the light diffusion substrate 60 closest to the microlens substrate 50.
- it refers to the distance between the top of the microlens array substrate 50 from which the microlens array 54 protrudes most and the top of the light diffusion surface 64 of the light diffusion substrate 60 that protrudes most.
- interval it is the same as that of X mentioned later.
- the light emitted from the projection mirror 30 and scanned by the microlens array substrate 50 forms an image on the light diffusion surface 64 of the light diffusion substrate 60.
- an image is formed by the microlens array substrate 50 and the light diffusing substrate 60 in this way, so that it is visually recognized as compared with the case where an image is formed using a simple screen.
- Light can be transmitted effectively in the direction, and the luminance can be increased.
- sufficient luminance can be obtained with a small amount of light, it is possible to reduce the power by suppressing the output of each laser light source and the like.
- the laser beam image formed on the microlens array 54 of the transmission screen 40 as described above is reflected by the concave mirror 80 and projected onto the windshield 6.
- the projection unit 85 includes a structure that projects an image on the windshield 6 of the vehicle and a structure that projects an image on a combiner (not shown) provided between the driver and the windshield 6. possible.
- the layout is such that the microlens array substrate 50 is disposed on the light source side such as laser light, but the light diffusion substrate 60 of the transmissive screen 40 is disposed on the light source side, as shown in FIG.
- a layout may be used. However, as a result of experiments described later, it has been found that the former layout is preferable.
- optical member provided between the transmissive screen 40 and the windshield 6 or combiner is not limited to the concave mirror 80, and the transmissive screen 40 and the windshield 6 or combiner (not shown). Other suitable optical members can be used depending on the layout of
- the drawing method of the head-up display device 100 is described based on an example in which the transmissive screen 40 is applied to a laser projector method that includes the projection unit 10 and the projection mirror 30.
- the transmissive screen 40 according to the present invention adopts an LCOS method using a light source and an LCOS (Liquid crystal on silicon) element as a drawing method of the head-up display device 100, or a light source
- the present invention can also be applied to a device employing a DLP (Digital Light Processing) method using a DMD (Digital Mirror Device) element.
- the light from the light source is selectively reflected by the LCOS element, which is a reflective liquid crystal element, with respect to the transmission screen 40, and in the case of the DLP system.
- the DMD element which is a reflective element in which a plurality of micromirrors are arranged, selectively reflects the light from the light source to the transmissive screen 40, so that the head-up display device 100. Can be realized.
- the base material used as the base of the transmissive screen 40 may be any material as long as it is transparent.
- thermoplastic resin for example, a polycarbonate resin, an acrylic resin, a fluorine acrylic resin, a silicone acrylic resin, examples include epoxy acrylate resins, polystyrene resins, cycloolefin polymers, methylstyrene resins, fluorene resins, PET, and polypropylene.
- microlens array base material 50 and the light diffusion base material 60 are not necessarily formed from one base base material.
- the microlens array substrate 50, the microlens array 54 and the like and the substrate-like member may be configured as separate members, and these may be bonded together with an adhesive or the like.
- the microlens array 54 can be processed by processing the mold of the microlens array into a mold by mechanical cutting using a nano-processing device, and transferring the mold to a transparent resin using this mold. Further, as a processing method of the microlens array 54, a method of transferring to a resin by injection molding with the above-described mold can be used. A method of directly processing the microlens array 54 into a transparent resin by mechanical cutting can also be used.
- Nano-scale aspherical processing is effective.
- any method such as a resist reflow method, an ink jet method, an electron beam exposure method, a laser beam drawing method, a method using chemical etching or plasma etching, or a method using a punch is adopted. can do.
- FIG. 8 is a diagram for explaining the definition of the diffusion angle.
- light is vertically incident on the microlens array substrate 50 and the light diffusion substrate 60 constituting the transmission screen 40, and is emitted from the microlens array substrate 50 and the light diffusion substrate 60.
- the microlens array substrate 50 includes a horizontal (second direction) diffusion angle ⁇ H and a vertical direction (first direction) diffusion angle ⁇ V shown in FIG. Preferably have a relationship of ⁇ H > ⁇ V. This is because the image information displayed on the head-up display device 100 is horizontally long.
- the horizontal diffusion angle ⁇ H is 20 ° or more and 60 ° or less
- the vertical diffusion angle ⁇ V is 5 ° or more and 35 ° or less. More preferably, when the horizontal diffusion angle ⁇ H is 20 ° or more and 50 ° or less and the vertical diffusion angle ⁇ V is 10 ° or more and 30 ° or less, the transmission screen 40 used in the head-up display device 100 is optimal. It will be something.
- diffusion angle (theta) D is 5 degrees or more and 6 degrees or less.
- the anisotropic diffusion property (horizontal and vertical directions) of the microlens array substrate 50 is used. It is desirable to combine with a light diffusing substrate 60 having a small diffusion angle (in combination with a light diffusing substrate having a large diffusion angle), in order to maintain a property that the diffusion profile is different). Because the nature of becomes dominant and approaches the isotropic diffusion as a whole).
- the diffusion base material 60 has a diffusion angle ⁇ D of 5 ° or more and 6 ° or less. The thing is adopted.
- FIG. 9 is a diagram schematically illustrating an example of a manufacturing process of the microlens array substrate 50. In the embodiment, the manufacturing is performed in the order of FIG. 9A ⁇ FIG. 9B ⁇ FIG. 9C.
- a base material 71 made of polycarbonate resin is prepared as a transparent resin material.
- a concave mold 75 is formed by reversing an aspherical microlens array on a steel material by mechanical cutting (ROBONANO manufactured by FANUC).
- a UV resin is applied to the steel material (mold 75) on which the above-described inversion microlens array is formed, and as shown in FIG. 9B, the base material 71 is formed with a mold 75, a polycarbonate reference sheet 76, and the like. And UV irradiation from the reference sheet 76 side. As a result, the microlens portion 73 is formed on the base material 71.
- the mold 75 is released and the reference sheet 76 is peeled off to obtain the microlens array substrate 50.
- 10 to 12 are diagrams schematically illustrating an example of the manufacturing process of the light diffusing substrate 60.
- FIG. 10 (A) shows the mold material.
- One surface of such a mold material is subjected to sandblasting to obtain an intermediate treatment material 123 shown in FIG.
- bead blasting is further performed on the surface of the intermediate treatment material 123 that has been sandblasted to obtain a second mold 125 shown in FIG.
- such a mold material is used, and a method of transferring fine irregularities to the resin by injection molding is employed. Since such fine unevenness serves as a transfer of the blasted surface, the period of the unevenness is random.
- the fine irregularities manufactured in this manner function as the light diffusion surface 60, and light isotropically diffuses. Random means that the arrangement of fine irregularities is not regular.
- the mold material is subjected to sand blasting and then subjected to bead blasting to form a fine uneven transfer pattern, but only by any blasting, A fine uneven transfer pattern may be formed on the mold material.
- FIG. 11 shows that the transparent resin material 130 is filled between the first mold 115 and the second mold 125.
- FIG. 12 shows a state in which after the resin material 130 is cured (after solidification), it is released from the first mold 115 and the second mold 125 to obtain the light diffusion base material 60 according to the present invention. Show.
- the light diffusion surface 64 is obtained by transferring the blasted portion provided in the mold. Fine concavo-convex portions may be formed by directly performing sandblasting or bead blasting on one surface of the substrate.
- the transmissive screen 40 As described so far, in the transmissive screen 40 according to the present invention, the first surface 51 provided with the microlens array 54 of the microlens array substrate 50 and the light diffusion surface 64 of the light diffusion substrate 60 are provided.
- the characteristic feature is that the provided second surface 61 and the second surface 61 are opposed to each other.
- the following is performed. explain.
- FIG. 13 is a diagram for explaining an arrangement pattern of the microlens array substrate and the light diffusion substrate.
- (1) to (8) show different ways of facing the microlens array substrate and the light diffusion substrate, and (3) and (4) are the arrangement patterns according to the present invention.
- the direction of the light emitted from the projection unit is indicated by an arrow.
- X indicates the facing interval, and if it is a microlens array substrate, the most protruding portion on the light diffusion substrate side, and if it is a light diffusion substrate, the most protruding portion on the microlens array substrate side Defined as the distance between.
- Such a facing distance X could be confirmed by a gap gauge.
- microlens array substrate a microlens pitch of 31 ⁇ m, a height of 5 ⁇ m, and a square lattice array was used.
- light diffusing substrate Aromabright FG-2035C (manufactured by Nippon Polyester), which is a diffusion plate made of polycarbonate, was used.
- a higher value is preferable for the average luminance, which is an index of brightness, and a lower value is preferable for the luminance dispersion, which is an index of variation. Furthermore, since it is preferable that the brightness is small and the variation is small, it is preferable that the value of the relative standard deviation obtained by the standard deviation / average luminance is lower.
- FIG. 14 to FIG. 21 show the result of each arrangement pattern.
- (A) is a graph of average luminance, luminance dispersion, and relative standard deviation at each facing interval
- (B) is a photograph of a text image
- (C) is a calculation of (A). This is a photograph of a white image. Further, in (B) and (C), a facing interval X is displayed at the lower right of the image.
- the transmission screen 40 according to the present invention includes a first surface 51 provided with the microlens array 54 of the microlens array substrate 50, and a second surface 61 provided with the light diffusion surface 64 of the light diffusion substrate 60. Are arranged opposite to each other. According to the transmission screen 40 according to the present invention as described above, the uniformity of the emitted light is impaired as compared with the case using two microlens arrays. In addition, the sharpness of the image can be maintained. Such an effect of the transmission screen 40 according to the present invention could be confirmed experimentally as described above.
- the head-up display device 100 according to the present invention uses the transmissive screen 40 as described above, the head-up display device 100 according to the present invention does not impair the uniformity of the image. It is also possible to maintain the sharpness.
- the diffusion angle ⁇ D of the light diffusion base material 60 is 5 ° or more and 6 ° or less.
- the diffusion angle ⁇ D was calculated by measuring the Y value in the transmittance measurement by the angle change using a three-dimensional angle change spectrocolorimetry system (GCMS-13 type, manufactured by Murakami Color Research Laboratory Co., Ltd.). .
- FIG. 22 shows the observation results of a combination of (C) a microlens array substrate 50 and a light diffusion substrate 60 having a diffusion angle ⁇ D of 5.7 °.
- the transmissive screen of only the microlens array substrate 50 in FIG. 22A the rainbow-colored stripe pattern due to the diffracted light appears prominently and lacks suitability as the transmissive screen.
- the rainbow color caused by diffracted light is used.
- the striped pattern disappears and can be suitably used as a transmission screen.
- the diffusion base material 60 having a diffusion angle ⁇ D of 5 ° or more and 6 ° or less is employed.
- the first surface of the microlens array substrate on which the microlens array is provided is opposed to the second surface of the light diffusion substrate on which the light diffusion surface is provided. According to such a transmission screen according to the present invention, an image can be obtained without impairing the uniformity of the emitted light, as compared with the one using two microlens arrays. It is also possible to maintain the sharpness.
- the head-up display device according to the present invention uses the transmission screen as described above, according to the head-up display device according to the present invention, the sharpness of the image is obtained without impairing the uniformity of the image. Can also be maintained.
- the uniformity of the emitted light emitted from the transmissive screen is impaired and the sharpness of the image is lost (resolution is reduced).
- the main surface of the microlens array substrate on which the microlens array is provided and the main surface of the light diffusion substrate on which the light diffusion surface is provided are arranged to face each other. According to such a transmissive screen according to the present invention, the sharpness of the image can be reduced without impairing the uniformity of the emitted light, as compared with the case using two microlens arrays. Can be maintained for a long time, and industrial applicability is very large.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Instrument Panels (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Optical Elements Other Than Lenses (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
図11は、第1の型115と第2の型125との間に、透明な樹脂材料130を充填する様子を示しており、図12は樹脂材料130の硬化後(固化後)、第1の型115と第2の型125とから離型し、本発明に係る光拡散基材60を得る様子を示している。
6・・・ウインドシールド
10・・・投影部
11・・・第1光源
12・・・第2光源
13・・・第3光源
21・・・第1ダイクロイックプリズム
22・・・第2ダイクロイックプリズム
26・・・コリメータレンズ
30・・・投影ミラー(走査部)
40・・・透過型スクリーン
50・・・マイクロレンズアレイ基材
51・・・第1主面(第1面)
52・・・第2主面(第3面)
53・・・マイクロレンズ
54・・・マイクロレンズアレイ
55・・・平滑面
60・・・光拡散基材
61・・・第1主面(第2面)
62・・・第2主面(第4面)
64・・・光拡散面
65・・・平滑面
71・・・基材
73・・・マイクロレンズ部
75・・・型
76・・・リファレンスシート
80・・・凹面ミラー
85・・・投影ユニット
100・・・ヘッドアップディスプレイ装置
123・・・中間処理材
125・・・第2の型
130・・・樹脂材料
Claims (10)
- 複数のマイクロレンズを含むマイクロレンズアレイが設けられた第1面を有するマイクロレンズアレイ基材と、
光拡散面が設けられた第2面を有する光拡散基材と、を有し、
前記マイクロレンズアレイ基材の前記マイクロレンズアレイが設けられた第1面と、前記光拡散基材の前記光拡散面が設けられた第2面と、が対向配置されることを特徴とする透過型スクリーン。 - 前記マイクロレンズアレイ基材と前記光拡散基材との間の対向間隔が0μm以上100μm以下であることを特徴とする請求項1に記載の透過型スクリーン。
- 前記マイクロレンズアレイは、第1方向と、前記第1方向と交わる第2方向に配置されており、
前記マイクロレンズアレイ基材の第1方向の拡散角と、前記マイクロレンズアレイ基材の第2方向の拡散角と、が異なることを特徴とする請求項1又は請求項2に記載の透過型スクリーン。 - 前記光拡散基材の拡散角が5°以上6°以下であることを特徴とする請求項1乃至請求項3のいずれか1項に記載の透過型スクリーン。
- 前記光拡散面が微細凹凸からなることを特徴とする請求項1乃至請求項4のいずれか1項に記載の透過型スクリーン。
- 前記凹凸の周期がランダムであることを特徴とする請求項5に記載の透過型スクリーン。
- 請求項1乃至請求項6のいずれか1項に記載の透過型スクリーンが用いられることを特徴とするヘッドアップディスプレイ装置。
- レーザー光を発生するレーザー光源と、
前記レーザー光を前記透過型スクリーンに走査する走査部と、を有することを特徴とする請求項7に記載のヘッドアップディスプレイ装置。 - 光を発生する光源と、
前記光を前記透過型スクリーンに反射するLCOS素子と、を有することを特徴とする請求項7に記載のヘッドアップディスプレイ装置。 - 光を発生する光源と、
前記光を前記透過型スクリーンに反射するDMD素子と、を有することを特徴とする請求項7に記載のヘッドアップディスプレイ装置。
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JP2017502436A JP6156671B2 (ja) | 2015-02-26 | 2016-02-24 | 透過型スクリーン及びそれを用いたヘッドアップディスプレイ装置 |
CN201680011750.6A CN107250911A (zh) | 2015-02-26 | 2016-02-24 | 透射型屏幕和使用了该透射型屏幕的平视显示器装置 |
EP16755571.3A EP3264173A4 (en) | 2015-02-26 | 2016-02-24 | Transmissive screen and head-up display device using same |
US15/552,620 US20180052322A1 (en) | 2015-02-26 | 2016-02-24 | Transmission type screen and head-up display device using same |
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EP (1) | EP3264173A4 (ja) |
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Also Published As
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EP3264173A4 (en) | 2018-10-31 |
JP6156671B2 (ja) | 2017-07-05 |
JPWO2016136827A1 (ja) | 2017-07-13 |
US20180052322A1 (en) | 2018-02-22 |
CN107250911A (zh) | 2017-10-13 |
JP2017215588A (ja) | 2017-12-07 |
JP6593391B2 (ja) | 2019-10-23 |
EP3264173A1 (en) | 2018-01-03 |
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