WO2019088290A1 - Polarizing member and head-up display device equipped with same - Google Patents

Polarizing member and head-up display device equipped with same Download PDF

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Publication number
WO2019088290A1
WO2019088290A1 PCT/JP2018/041033 JP2018041033W WO2019088290A1 WO 2019088290 A1 WO2019088290 A1 WO 2019088290A1 JP 2018041033 W JP2018041033 W JP 2018041033W WO 2019088290 A1 WO2019088290 A1 WO 2019088290A1
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WO
WIPO (PCT)
Prior art keywords
display
polarizing
plate
support plate
cover
Prior art date
Application number
PCT/JP2018/041033
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French (fr)
Japanese (ja)
Inventor
中村　大輔
正晴 橋爪
Original Assignee
株式会社ポラテクノ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社ポラテクノ filed Critical 株式会社ポラテクノ
Priority to KR1020207015691A priority Critical patent/KR20200084336A/en
Priority to CN201880070612.4A priority patent/CN111356946A/en
Publication of WO2019088290A1 publication Critical patent/WO2019088290A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • 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
    • 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]
    • 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
    • G02B27/01—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
    • G02B5/30—Polarising elements

Definitions

  • the present disclosure relates to a polarization member and a head-up display device including the same.
  • a head-up display device which displays an image on a display such as a display, reflects the image on a mirror, and projects the image as a virtual image on glass or the like.
  • the head-up display device is used to display information and the like superimposed on the user's normal view.
  • the head-up display device has various applications such as an automobile that displays information such as the vehicle speed on a windshield.
  • a translucent cover is provided to prevent dust and dirt from entering from a projection port that projects an image from the device body to a projection unit such as a windshield. It is done.
  • a translucent cover a polycarbonate plate is usually used.
  • the light transmitting cover has polarization characteristics.
  • the translucent cover for HUD devices in the conventional transparent translucent cover, the problem of the internal structure of the device being visible is disclosed as a configuration in which a translucent cover provided with a light absorbing layer by a polarizer is provided. There is.
  • the in-vehicle HUD device is mounted on a dashboard. Not only the heat of the device light source, but also the heat generated by sunlight, this heat particularly affects the life of the display inside the device, so it is necessary to take some measures against the heat and external light.
  • the light transmitting cover having the polarizing function is effective for the purpose.
  • the translucent cover to be attached it is necessary to provide the durability required by the on-vehicle standard and the flame retardancy required by the interior standard.
  • the absorption axis of the cover (hereinafter referred to as “polarization cover") to which the polarization characteristic is imparted is parallel to the absorption axis of the front polarizing plate of the liquid crystal display (hereinafter referred to as "LCD”) on the projection side.
  • polarization cover the absorption axis of the cover (hereinafter referred to as "polarization cover") to which the polarization characteristic is imparted is parallel to the absorption axis of the front polarizing plate of the liquid crystal display (hereinafter referred to as "LCD") on the projection side.
  • LCD liquid crystal display
  • the wavelength near ultraviolet light ie, polarization near 400 nm Since the characteristics are low, the white display of the projected image may be yellowish, which may deteriorate the reproducibility of the original color display set on the display.
  • a flame retardant plastic support is attached to both sides of a polarizing plate as a dye-based polarizer, and the transmittance and hue of polarized light parallel to the transmission axis of the polarizing member are optimized. It has been found to suppress the yellowish phenomenon in the white display of the projected image.
  • one aspect of the present disclosure is a polarizing member, in which the visibility correction transmittance Ky of polarized light parallel to the transmission axis of the polarizer is 70 ⁇ Ky ⁇ 95, and the hue values a * and b * are A polarizing plate having a polarizer using a dye-based polarizing material satisfying ⁇ 2 ⁇ a * and b * ⁇ 2, a first support plate bonded to the surface of the polarizing plate through a tacky adhesive layer, and And a second supporting plate bonded to the back surface of the polarizing plate via a pressure-sensitive adhesive layer.
  • polarization cover that transmits the image output from the display to the outside of the housing, including the above-mentioned polarization member, a display that outputs an image, and a housing that houses the display. It is preferable to use a HUD device.
  • the present disclosure since it has flame retardancy, it is less in optical deterioration such as shape deformation or discoloration even when exposed to high temperature, and the hue of the polarizing member is optimized by the dye-based polarizer. It is possible to provide a polarizing member and a HUD device using the same, in which the phenomenon of yellowing in the white display of the projected image is improved.
  • the HUD device 100 includes a housing 10, a display 12, a plane mirror 14, a concave mirror 16, a polarization cover (polarization member) 18 and a projection unit 20. Be done.
  • the housing 10 accommodates components such as the display 12, the flat mirror 14 and the concave mirror 16 that constitute the HUD device 100.
  • the housing 10 is made of a material having mechanical strength, such as plastic or metal.
  • the display 12 is a device that outputs an image projected by the HUD device 100.
  • the display 12 is configured by an LCD or the like.
  • the image light emitted from the display 12 is linearly polarized.
  • the flat mirror 14 is provided to reflect the image light emitted from the display 12 toward the concave mirror 16.
  • the concave mirror 16 is provided to reflect the image light arriving from the plane mirror 14 toward the projection unit 20.
  • the concave mirror 16 magnifies the image light at a desired magnification and causes the projection unit 20 to project the light.
  • the polarization cover 18 is a translucent plate-like member mounted in an opening provided in the housing 10.
  • the polarization cover 18 is provided so as to transmit the image light reflected by the concave mirror 16 to the outside of the housing 10 and prevent dust and dirt from entering the inside of the housing 10.
  • the configuration of the polarization cover 18 will be described later.
  • the projection unit 20 receives the image light arriving from the concave mirror 16 and projects the virtual image as a projection image.
  • the projection unit 20 may use a half mirror or a holographic element to secure the normal vision of the user.
  • the projection unit 20 be configured to be able to change the mounting angle and the mounting position with respect to the housing 10.
  • the polarization cover 18 is configured to include a polarization plate 34 having a polarizer.
  • FIG. 2 shows the cross-sectional structure of an example of the polarization cover 18.
  • the polarization cover 18 has a configuration in which the first support plate 30, the adhesive and pressure-sensitive adhesive layer 32, the polarizing plate 34, the adhesive and pressure-sensitive adhesive layer 36, and the second support plate 38 are stacked.
  • the polarization cover 18 includes the first support plate 30, the visco-adhesive layer 32, the retardation plate 31, the visco-adhesive layer 33, the polarizing plate 34, and visco-adhesive
  • stacked the adhesion layer 36 and the 2nd support plate 38 is mentioned.
  • the polarizing plate 34 is a layer including a polarizer that transmits only light polarized in a specific direction.
  • the polarizing plate 34 can be selected arbitrarily, it is preferable to use, for example, a dye-based polarizing plate obtained by dyeing a polyvinyl alcohol (PVA) film with a dichroic dye.
  • PVA film for example, VF-PS # 7500 manufactured by Kuraray can be applied.
  • the PVA film is stretched, for example, to a thickness of about 30 ⁇ m after stretching a film of 75 ⁇ m in thickness before stretching.
  • the polarizing plate 34 is formed on one side of the PVA film.
  • the visibility correction transmittance Ky of polarized light parallel to the transmission axis of the polarizer is 70 ⁇ Ky ⁇ 95, and the hue value of the polarizing plate in the L * a * b * color system at this time is It is preferable to use a dye-based material having one or more dichroism so that a * and b * satisfy ⁇ 2 ⁇ a * and b * ⁇ 2, respectively. That is, since light emitted from the liquid crystal panel is light transmitted through the polarizing plate, it is polarized light, and when transmitted through the polarizing cover 18 for HUD, the polarized light parallel to the transmission axis We are greatly affected.
  • coloring of the display can be suppressed by optimizing the transmitted light for polarized light parallel to the transmission axis to be neutral.
  • a dye type polarizing plate is suitable.
  • An iodine-based polarizing plate is not suitable because it may lose its polarization characteristics due to external light, heat, and the like.
  • the dye-based material preferably contains an azo compound and / or a salt thereof.
  • a dye-based material satisfying the following chemical formula.
  • R1 and R2 each independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group, and an azo compound in which n is 1 or 2 and a salt thereof.
  • R 1 and R 2 independently represents a hydrogen atom, a methyl group or a methoxy group.
  • R1 and R2 are hydrogen atoms.
  • the material obtained in the following steps Add 13.7 parts of 4-aminobenzoic acid to 500 parts of water and dissolve with sodium hydroxide. The resulting material is cooled and 32 parts of 35% hydrochloric acid is added below 10 ° C., then 6.9 parts of sodium nitrite are added and stirred at 5-10 ° C. for 1 hour. Thereto, 20.9 parts of sodium aniline- ⁇ -methanesulfonate is added, and while stirring at 20-30 ° C., sodium carbonate is added to adjust to pH 3.5. The reaction is further stirred to complete the coupling reaction and filtered to obtain a monoazo compound. The obtained monoazo compound is stirred at 90 ° C. in the presence of sodium hydroxide to obtain 17 parts of a monoazo compound of the chemical formula (2).
  • the dye of compound (3) is 0.01%
  • C.I. Direct Red 81 is 0.01%, which is represented by the following structural formula (4) shown in Example 1 of Japanese Patent No. 2622748.
  • the dye is 0.03%, the dye represented by the following structural formula (5) disclosed in Example 23 of JP-A-60-156759, and the concentration of 0.03% of the dye and 0.1% of mirabilite at 45 ° C.
  • the substrate is immersed in an aqueous solution of polyvinyl alcohol (PVA) having a thickness of 75 ⁇ m for 4 minutes. This film is stretched 5 times at 50 ° C. in a 3% aqueous boric acid solution, washed with water and dried while maintaining tension.
  • PVA polyvinyl alcohol
  • the transmittance near 400 nm can be made higher than the optical characteristics of the neutral color, or the waveform in which the hue at the parallel position is less colored It can also be adjusted to
  • the visibility correction (parallel light) transmittance Ky and hue values a * and b * are in the above-mentioned range, the phenomenon of yellowing on the white display of the projected image is suppressed, and neutral hue is exhibited.
  • the optical characteristics and the optical characteristics of the panel are in an optimal relationship. Further, in order to prevent the light of the display from being blocked and the visibility from being lowered, it is preferable to set the visibility correction parallel light transmittance of the polarizing plate to 70% or more. Moreover, in order to prevent that the effect of the thermal load reduction by sunlight falls, it is suitable to make the visibility correction parallel light transmittance of a polarizing plate into 95% or less.
  • the hue values a * and b * of the polarizing plate is out of the above range.
  • dye-based polarizing plates satisfying the above characteristics are, for example, SHC-215U exhibiting paper white for reflective LCDs made by Polatechno, or blue polarizing plates SHC-B15U, achromatic polarizing plates ACP-115U, etc. Can be mentioned.
  • the polarizing plate 34 may have a structure in which the polarizing film obtained by the above-described manufacturing method is bonded to a base material.
  • the base material is a member to be a protective layer of the polarizing plate 34.
  • a base material can be selected arbitrarily, it is suitable to use a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin film, etc., for example.
  • TAC triacetyl cellulose
  • acrylic film acrylic film
  • a cyclic olefin film etc.
  • TacBright P960GL or the like can be applied.
  • the thickness of the substrate is not limited to this, but is preferably 20 ⁇ m or more and 200 ⁇ m or less. In order to obtain a polarizer having a small optical change with respect to heat and humidity and with reduced shrinkage and warpage, it is preferable to provide a substrate on both sides of the polarizing film.
  • the pressure-sensitive adhesive layer 32 is a layer for bonding the polarizing plate 34 and the first support plate 30.
  • the adhesive and pressure-sensitive adhesive layer 36 is a layer for bonding the polarizing plate 34 and the second support plate 38 together.
  • the pressure-sensitive adhesive or adhesive used for the adhesive and pressure-sensitive adhesive layer 32 and the adhesive and pressure-sensitive adhesive layer 36 is not particularly limited as long as it is acrylic or polyester, and materials other than these may be used.
  • the pressure-sensitive adhesive layer 32 and the pressure-sensitive adhesive layer 36 absorb (buffer) a force, such as a thermal stress, acting between the polarizing plate 34 and the first support plate 30 or the second support plate 38. By using such a material, it is possible to reduce the warpage of the polarizing cover that is generated. In such a case, it is preferable to use a pressure-sensitive adhesive, and the thickness of the pressure-sensitive adhesive layer is preferably 10 ⁇ m or more and 50 ⁇ m or less.
  • the adhesive and pressure-sensitive adhesive layer 32 may be obtained by adding an additive such as a dye or a pigment to an adhesive or an adhesive.
  • an additive such as a dye or a pigment
  • the retardation plate 31 is a member that causes a phase difference between a polarization component parallel to the optical axis and a polarization component perpendicular to the optical axis.
  • the retardation plate 31 is preferably arranged on the output side of the display light output from the display 12.
  • the retardation plate 31 is attached to the surface of the polarizing plate 34 via the adhesive layer 33.
  • polarized sunglasses have the property of blocking linearly polarized light in the horizontal direction, and display light which is linearly polarized light adjusted in the horizontal direction by the half-wave plate is blocked by the polarized sunglasses, so the vehicle driver sees it.
  • the brightness of the virtual image may be low.
  • the retardation plate 31 can rotate the polarization axis of display light which is linear polarization emitted from the display 12, reduce polarization in the horizontal direction, and improve the visibility of a virtual image. Therefore, even when the vehicle driver wears polarized sunglasses, it is possible to provide a HUD device that is less likely to reduce visibility.
  • the first support plate 30 and the second support plate 38 are members for mechanically supporting the polarization cover 18. That is, the first support plate 30 is attached to the surface of the polarizing plate 34 via the adhesive layer 32, or in the configuration in which the retardation plate 31 is provided, the retardation is provided via the adhesive layer 32. It is stuck on the board 31.
  • the second support plate 38 is attached to the back surface of the polarizing plate 34 via the adhesive layer 36.
  • the first support plate 30 and the second support plate 38 preferably include a flame retardant plastic plate. That is, by forming the first support plate 30 and the second support plate 38 with a flame-retardant plastic plate, the HUD device 100 conforming to the standard for mounting on a car or the like can be realized.
  • the first support plate 30 and the second support plate 38 have a flat surface so as not to distort an image transmitted through the polarization cover 18. Further, it is preferable to use a low phase difference light which does not cause a phase difference in the transmitted light so that the light (polarized light) transmitted through the polarization cover 18 is not disturbed.
  • first support plate 30 and the second support plate 38 are preferably made of polycarbonate (PC) plate, acrylic resin plate, cellulose plate, nylon plate or the like.
  • first support plate 30 and the second support plate 38 may be materials obtained by incombustible treatment of combustible materials.
  • the first support plate 30 and the second support plate 38 each have a thickness of 50 ⁇ m or more.
  • first support plate 30 and the second support plate 38 may have a structure in which a plurality of layers are stacked instead of a single layer.
  • the main plate A is a polycarbonate (PC) plate and an acrylic resin plate is stacked thereon as a sub plate B.
  • the acrylic resin plate can be, for example, polymethyl methacrylate (PMMA) or the like.
  • first support plate 30 and the second support plate 38 are protected by HC (Hard Coat), AG (Anti-Glare), AR (Anti-Reflection), LR (Low-Reflection), etc. for surface protection.
  • a layer C may be provided. It is desirable that HC exhibits a hardness of HB or more in a pencil hardness test (7.48 N load) specified in JIS K5600-5-4.
  • the polarization direction of light (linearly polarized light) output from the display 12 and transmitted through the polarization cover 18 is parallel to the polarization direction of the polarization plate 34 of the polarization cover 18. It is preferable to arrange so that
  • the HUD device 100 with improved image visibility can be realized.
  • the mechanical strength of the polarizing cover 18 can be enhanced by supporting the front and back surfaces of the polarizing plate 34 by the first support plate 30 and the second support plate 38.
  • the first support plate 30 and the second support plate 38 include a flame retardant plastic plate, specifically, as a means for imparting flame retardancy to polycarbonate (PC), It is preferable to coat or co-press using a method of mixing at least one of metal oxides, halogens, and phosphorus, or a flame-retardant material.
  • halogens it is more preferable to use bromine in consideration of cost, coloring, properties of polycarbonate (PC) and environmental impact.
  • the polycarbonate (PC) is mixed with at least one of metal oxide, halogen and phosphorus, it is preferable to knead the selected raw material into the polycarbonate (PC).
  • Example 1 and Comparative Examples 1 and 2 For example, SHC-215U (film thickness 215 ⁇ m) made by Polatechno as the polarizing plate 34 is applied, and MRF 08U made by Mitsubishi Gas Chemical Co., Ltd. as the first support plate 30 and the second support plate 38 is attached to both sides of the polarizing plate 34
  • the polarizing cover 18 can be configured by laminating the adhesive layer 32 and the adhesive layer 36.
  • the polarization cover 18 has a natural light (sunlight) transmittance of about 44%, and can cut about 56%.
  • the transmittance of linearly polarized light is about 84%, and the light emitted from the display 12 can be transmitted about 84%.
  • the polarizing film when an iodine-based polarizing film is applied to the polarizing cover 18, the polarizing film is discolored due to heating at 90 ° C. or more, and the light transmittance is reduced.
  • a dye-based material as the polarizing plate 34, the deformation of the polarization cover 18 is suppressed even in a use environment of 90 ° C. or more, and the color is high without discoloration. Optical transparency can be maintained.
  • Example 1 in which a flame retardant plastic plate is applied to the first support plate 30 and the second support plate 38 and Comparative Examples 1 and 2 for the same will be described.
  • a flame retardant PC obtained by mixing polycarbonate (PC) with at least one of metal oxide, bromine, phosphorus and halogen is applied.
  • a general polycarbonate (PC) (LEXAN 8010Q made by SABIC) was applied as the first support plate 30 and the second support plate 38.
  • a flame retardant PC was applied as the first support plate 30 and the second support plate 38 was not provided.
  • Example 1 Comparative Example 1 and Comparative Example 2, warpage when heating at 105 ° C. for 48 hours was confirmed.
  • Example and Comparative Example 1 no change in shape was observed. That is, in the example and the comparative example 1, no bending or undulation was observed.
  • Comparative Example 2 a large change in shape was observed.
  • the effect is more remarkable if the mixing amount of at least one of metal oxide, halogen, and phosphorus is larger than that of general polycarbonate (PC) (for example, LEXAN 8010Q manufactured by SABIC).
  • PC general polycarbonate
  • a polarizing film was produced by pasting a polycarbonate film (MRF08U manufactured by Mitsubishi Gas Chemical Co., Ltd.) to an TAC-based film on both sides of this polarizing plate through an acrylic adhesive transfer having a thickness of 25 ⁇ .
  • the polarizing member was set as the polarizing cover 18 for HUD so that the absorption axis of the polarizing plate of the polarizing cover 18 and the absorption axis of the polarizing plate on the front side of the monitor were parallel to each other.
  • the above monitor is driven, and using a color luminance meter (CA-2000 made by Konica Minolta) in a dark room, measure the hue at the time of full screen white display at a height of 50 cm with a front 0 degree azimuth, XYZ color system (CIE1931
  • the chromaticity values x and y were calculated based on the color system.
  • the hue change was calculated by subtracting the hue when the polarizing cover 18 for HUD was installed from the measured hue of the liquid crystal monitor alone.
  • the polarizing cover 18 was set on the IPS liquid crystal monitor in the same manner as in Example 2, and the hue was measured to calculate the hue change by the polarizing cover for HUD.
  • Example 4 The iodine polarizing plate mounted on both sides of the liquid crystal panel of the IPS liquid crystal monitor of Example 2 was changed to a Polatechno dye-based polarizing plate GHC-12U (Ys 40.5%, Py99.9%) and manufactured in Example 2.
  • a polarizing cover 18 for HUD was installed, and the hue was measured in the same manner as in Example 2, and the hue change by the polarizing cover 18 was calculated.
  • Example 5 On the liquid crystal panel of the IPS liquid crystal monitor set in Example 4, the polarizing cover 18 for HUD manufactured in Example 3 is placed, and the hue is measured in the same manner as in Example 1, and the hue change by the polarizing cover 18 is calculated. did.
  • Comparative example 4 The HUD polarizing cover of Comparative Example 3 was installed on the IPS liquid crystal monitor set in Example 4, the hue was measured, and the hue change due to the polarizing cover was calculated.
  • Table 1 shows the results of measurement of optical characteristics and hue in each of the examples and the comparative examples.
  • Example 2 indicates the change in luminance when the HUD polarizing cover is used, and ⁇ x and ⁇ y indicate the change in chromaticity due to the HUD polarizing cover.
  • Example 2 Example 3 and Comparative Example 3 are comparisons of hue changes when using the polarizing cover of the disclosure and the polarizing cover using the conventional dye-based polarizing plate exhibiting a neutral color.
  • Comparative Example 1 by using the polarization cover, both ⁇ x and ⁇ y shift to the plus side, and the white display is colored to the yellowish side.
  • Example 2 and Example 3 the change amounts of both ⁇ x and ⁇ y are small, and the hue change due to the use of the polarization cover is suppressed more than in Comparative Example 3.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
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Abstract

The present invention is a polarizing cover 18 equipped with: a polarizing plate 34 that has a polarizer and uses a dyed polarizing material in which the visibility corrected transmittance Ky of polarized light parallel to the transmission axis of the polarizer satisfies 70≤Ky≤95, and hues a* and b* satisfy -2≤a* and b*≤2; a first support plate 30 that is adhered to the surface of the polarizing plate 34 via an adhesive layer 32; and a second support plate 38 that is adhered to the rear surface of the polarizing plate 34 via an adhesive layer 36.

Description

偏光部材及びそれを備えたヘッドアップディスプレイ装置Polarizing member and head-up display device having the same
　本開示は、偏光部材及びそれを備えたヘッドアップディスプレイ装置に関する。 The present disclosure relates to a polarization member and a head-up display device including the same.
　画像をディスプレイ等の表示器に表示させ、当該画像をミラーに反射させて虚像としてガラス等に映し出すヘッドアップディスプレイ装置が用いられている。ヘッドアップディスプレイ装置は、情報等を利用者の通常の視界と重ね合わせて表示させるために用いられる。ヘッドアップディスプレイ装置は、フロントガラスに車速等の情報を表示させる自動車等の多様な応用例がある。 A head-up display device is used which displays an image on a display such as a display, reflects the image on a mirror, and projects the image as a virtual image on glass or the like. The head-up display device is used to display information and the like superimposed on the user's normal view. The head-up display device has various applications such as an automobile that displays information such as the vehicle speed on a windshield.
　車載用等のヘッドアップディスプレイ装置（以下、「ＨＵＤ装置」という）では、装置本体からフロントガラス等の投影部に画像を投影する投射口から埃やゴミが入り込まないよう透光性のカバーが設けられている。透光性のカバーとしては、通常、ポリカーボネイト板が使用されている。ここで、出射光の輝度を低下させることなく、外から太陽光等の入射による熱負荷を低減する目的で、透光カバーに偏光特性をもたせることが提案されている。 In a head-up display device for vehicles, etc. (hereinafter referred to as “HUD device”), a translucent cover is provided to prevent dust and dirt from entering from a projection port that projects an image from the device body to a projection unit such as a windshield. It is done. As a translucent cover, a polycarbonate plate is usually used. Here, for the purpose of reducing the heat load due to the incidence of sunlight or the like from the outside without lowering the luminance of the emitted light, it has been proposed that the light transmitting cover has polarization characteristics.
　また、ＨＵＤ装置用透光カバーについて、従来の透明な透光カバーでは当該装置の内部構造が見えてしまう課題に対し、偏光子による光吸収層を設けた透光カバーとする構成が開示されている。 In addition, as for the translucent cover for HUD devices, in the conventional transparent translucent cover, the problem of the internal structure of the device being visible is disclosed as a configuration in which a translucent cover provided with a light absorbing layer by a polarizer is provided. There is.
　車載用ＨＵＤ装置はダッシュボード上に装着される。装置光源の熱だけでなく、太陽光により発生する熱に晒されるため、この熱が特には装置内部のディスプレイの寿命に影響を及ぼすことから、熱や外光へ何等かの対策が必要となっており、前記偏光機能を有する透光カバーはその目的に有効とされる。また、装着される前記透光カバーにおいても車載規格で必要とされている耐久性や当該内装規格で求められる難燃性を付与しなければならない。 The in-vehicle HUD device is mounted on a dashboard. Not only the heat of the device light source, but also the heat generated by sunlight, this heat particularly affects the life of the display inside the device, so it is necessary to take some measures against the heat and external light. The light transmitting cover having the polarizing function is effective for the purpose. In addition, also in the translucent cover to be attached, it is necessary to provide the durability required by the on-vehicle standard and the flame retardancy required by the interior standard.
　また、偏光特性が付与されたカバー（以下、「偏光カバー」という）の吸収軸は、投射側にある液晶ディスプレイ（以下、「ＬＣＤ」と示す）のフロント側の偏光板の吸収軸と平行となるように設置される。このとき、フロントガラスに投射される虚像の輝度、即ち、反射率が最大となるようにするため、投射される偏光光は水平方向の成分となるように偏光板あるいは装置内の光路上に位相差板が配置される。 In addition, the absorption axis of the cover (hereinafter referred to as "polarization cover") to which the polarization characteristic is imparted is parallel to the absorption axis of the front polarizing plate of the liquid crystal display (hereinafter referred to as "LCD") on the projection side. To be installed. At this time, in order to maximize the brightness of the virtual image projected on the windshield, that is, the reflectance, the polarized light to be projected is positioned on the light path in the polarizing plate or device so as to become a component in the horizontal direction. A phase difference plate is arranged.
　先行技術では、偏光カバーに偏光特性を持たせるためにポリカーボネイトなどのプラスチック基板に一般的な偏光板を貼り合わせた場合、熱によりプラスチック板に曲がりが生じ、投影される画像にゆがみが生じたり、カールによって筐体から外れたりするおそれがある。また、車両等の内装部品に用いられる場合、偏光特性を持たせた偏光カバーも燃焼試験の要求基準を満たすことが必要であるが、当該構成が前記要求基準を有するかについては言及されていない。 In the prior art, when a general polarizing plate is attached to a plastic substrate such as polycarbonate in order to give polarization characteristics to a polarizing cover, the heat causes the plastic plate to bend, causing distortion in the projected image, There is a risk of curling out of the case. Moreover, when it is used for interior parts such as a vehicle, it is necessary that the polarization cover having polarization characteristics also meet the requirements of the combustion test, but it is not mentioned whether the configuration has the requirements. .
　また、偏光カバーに中性色（平行位ではグレーで、直交位では黒色）を呈する一般的な二色性の偏光板を貼り合わせた場合、紫外線に近い側の波長、即ち、４００ｎｍ近傍の偏光特性が低いため、投影される画像の白表示に黄色がかってしまい、ディスプレイに設定された本来の色表示の再現性を損ねてしまう問題がある。 In addition, when a general dichroic polarizing plate exhibiting neutral color (gray in parallel position and black in orthogonal position) is attached to the polarization cover, the wavelength near ultraviolet light, ie, polarization near 400 nm Since the characteristics are low, the white display of the projected image may be yellowish, which may deteriorate the reproducibility of the original color display set on the display.
　また、ＨＵＤ装置内のＬＣＤには高い耐熱性が要求されている。そのため、前記ＬＣＤの偏光部材にはヨウ素系偏光板よりも高耐久を有する染料件偏光板が使用される可能性がある。そのため、一般的な染料系偏光板を積層した偏光カバーを用いると、染料系偏光板の二色性はヨウ素系偏光板よりも低いため、表示像の黄色味が一層強くなることが懸念される。 In addition, high heat resistance is required for the LCD in the HUD device. Therefore, there is a possibility that a dye-treated polarizing plate having higher durability than the iodine-based polarizing plate may be used as the polarizing member of the LCD. Therefore, when a polarizing cover in which general dye-based polarizing plates are laminated is used, there is a concern that the yellowishness of the display image may be further intensified because the dichroic property of the dye-based polarizing plate is lower than that of the iodine-based polarizing plate. .
　そこで、本開示は、上記問題に鑑み、車載使用における信頼性を有し、且つ、投影される画像の白表示に黄色がかる現象を抑える偏光部材及びそれを備えた表示装置を提供することを目的とする。 In view of the above problems, it is an object of the present disclosure to provide a polarizing member having reliability in in-vehicle use and suppressing a yellowing phenomenon in white display of a projected image, and a display device including the same. I assume.
　染料系偏光子とする偏光板の両辺に難燃性を有するプラスチック支持体を貼り合せ、且つ、当該偏光部材の透過軸に対して平行な偏光光の透過率及び色相を最適化することによって、投影される画像の白表示に黄色がかる現象を抑えることを見出した。 A flame retardant plastic support is attached to both sides of a polarizing plate as a dye-based polarizer, and the transmittance and hue of polarized light parallel to the transmission axis of the polarizing member are optimized. It has been found to suppress the yellowish phenomenon in the white display of the projected image.
　すなわち、本開示の１つの態様は、偏光部材であって、偏光子の透過軸と平行な偏光光の視感度補正透過率Ｋｙが７０≦Ｋｙ≦９５であり、色相値ａ＊及びｂ＊が－２≦ａ＊、ｂ＊≦２である染色系偏光材料を用いた偏光子を有する偏光板と、前記偏光板の表面に粘接着層を介して貼り合わされた第１支持板と、前記偏光板の裏面に粘接着層を介して貼り合わされた第２支持板と、を備えることを特徴とする偏光部材である。 That is, one aspect of the present disclosure is a polarizing member, in which the visibility correction transmittance Ky of polarized light parallel to the transmission axis of the polarizer is 70 ≦ Ky ≦ 95, and the hue values a * and b * are A polarizing plate having a polarizer using a dye-based polarizing material satisfying −2 ≦ a * and b * ≦ 2, a first support plate bonded to the surface of the polarizing plate through a tacky adhesive layer, and And a second supporting plate bonded to the back surface of the polarizing plate via a pressure-sensitive adhesive layer.
　また、上記偏光部材と、画像を出力する表示器と、前記表示器を収納する筐体と、を備え、前記表示器から出力される画像を前記筐体の外部へ透過する偏光カバーとして用いられているＨＵＤ装置とすることが好適である。 Further, it is used as a polarization cover that transmits the image output from the display to the outside of the housing, including the above-mentioned polarization member, a display that outputs an image, and a housing that houses the display. It is preferable to use a HUD device.
　本開示によれば、難燃性を有するため、高温に晒されても形状の変形や変色等の光学劣化が少なく、且つ、当該染料系偏光子により偏光部材の色相が最適化することにより、投影される画像の白表示に黄色がかる現象を改善された偏光部材及びそれを用いたＨＵＤ装置を提供することができる。 According to the present disclosure, since it has flame retardancy, it is less in optical deterioration such as shape deformation or discoloration even when exposed to high temperature, and the hue of the polarizing member is optimized by the dye-based polarizer. It is possible to provide a polarizing member and a HUD device using the same, in which the phenomenon of yellowing in the white display of the projected image is improved.
実施の形態におけるＨＵＤの構成を示す図である。It is a figure which shows the structure of HUD in embodiment. 実施の形態における偏光カバーの構成を示す図である。It is a figure which shows the structure of the polarization | polarized-light cover in embodiment. 実施の形態における偏光カバーの別例の構成を示す図である。It is a figure which shows the structure of another example of the polarization | polarized-light cover in embodiment. 実施の形態における支持板の構成例を示す図である。It is a figure which shows the structural example of the support plate in embodiment.
　本開示の実施の形態におけるＨＵＤ装置１００は、図１に示すように、筐体１０、表示器１２、平面ミラー１４、凹面ミラー１６、偏光カバー（偏光部材）１８及び投影部２０を含んで構成される。 As shown in FIG. 1, the HUD device 100 according to the embodiment of the present disclosure includes a housing 10, a display 12, a plane mirror 14, a concave mirror 16, a polarization cover (polarization member) 18 and a projection unit 20. Be done.
　筐体１０は、ＨＵＤ装置１００を構成する表示器１２、平面ミラー１４、凹面ミラー１６等の構成要素を収納する。筐体１０は、プラスチックや金属等の機械的な強度を有する材料で構成される。 The housing 10 accommodates components such as the display 12, the flat mirror 14 and the concave mirror 16 that constitute the HUD device 100. The housing 10 is made of a material having mechanical strength, such as plastic or metal.
　表示器１２は、ＨＵＤ装置１００によって投影される画像を出力する装置である。表示器１２は、ＬＣＤ等によって構成される。表示器１２から放射される画像光は直線偏光されている。 The display 12 is a device that outputs an image projected by the HUD device 100. The display 12 is configured by an LCD or the like. The image light emitted from the display 12 is linearly polarized.
　平面ミラー１４は、表示器１２から放射された画像光を凹面ミラー１６へ向けて反射させるために設けられる。凹面ミラー１６は、平面ミラー１４から到達した画像光を反射させて投影部２０へ向けて反射させるために設けられる。凹面ミラー１６は、画像光を所望の倍率で拡大して投影部２０へ投影させる。 The flat mirror 14 is provided to reflect the image light emitted from the display 12 toward the concave mirror 16. The concave mirror 16 is provided to reflect the image light arriving from the plane mirror 14 toward the projection unit 20. The concave mirror 16 magnifies the image light at a desired magnification and causes the projection unit 20 to project the light.
　偏光カバー１８は、筐体１０に設けられた開口部に装着された透光性の板状部材である。偏光カバー１８は、凹面ミラー１６によって反射された画像光を筐体１０の外部へ透過させると共に、筐体１０の内部に埃やゴミが入り込まないように設けられる。偏光カバー１８の構成については後述する。 The polarization cover 18 is a translucent plate-like member mounted in an opening provided in the housing 10. The polarization cover 18 is provided so as to transmit the image light reflected by the concave mirror 16 to the outside of the housing 10 and prevent dust and dirt from entering the inside of the housing 10. The configuration of the polarization cover 18 will be described later.
　投影部２０は、凹面ミラー１６から到達した画像光を受光し、その虚像を投影画像として映し出す。投影部２０は、利用者の通常の視覚も確保するためにハーフミラーやホログラフィック素子を用いてもよい。また、投影部２０は、筐体１０に対して取付け角度や取付け位置が変更できるように構成することも好適である。これにより、利用者の視線に合わせて、投影された画像が見易いように投影部２０の位置や角度を調整することができる。 The projection unit 20 receives the image light arriving from the concave mirror 16 and projects the virtual image as a projection image. The projection unit 20 may use a half mirror or a holographic element to secure the normal vision of the user. Moreover, it is also preferable that the projection unit 20 be configured to be able to change the mounting angle and the mounting position with respect to the housing 10. Thus, it is possible to adjust the position and the angle of the projection unit 20 so that the projected image can be easily viewed according to the line of sight of the user.
　偏光カバー１８は、偏光子を有する偏光板３４を含んで構成される。図２は、偏光カバー１８の一例の断面構造を示す。本実施の形態では、偏光カバー１８は、第１支持板３０、粘接着層３２、偏光板３４、粘接着層３６及び第２支持板３８を積層した構成とされる。 The polarization cover 18 is configured to include a polarization plate 34 having a polarizer. FIG. 2 shows the cross-sectional structure of an example of the polarization cover 18. In the present embodiment, the polarization cover 18 has a configuration in which the first support plate 30, the adhesive and pressure-sensitive adhesive layer 32, the polarizing plate 34, the adhesive and pressure-sensitive adhesive layer 36, and the second support plate 38 are stacked.
　他の好ましい実施の形態としては、図３に示すように、偏光カバー１８は、第１支持板３０、粘接着層３２、位相差板３１、粘接着層３３、偏光板３４、粘接着層３６及び第２支持板３８を積層した構成が挙げられる。 In another preferred embodiment, as shown in FIG. 3, the polarization cover 18 includes the first support plate 30, the visco-adhesive layer 32, the retardation plate 31, the visco-adhesive layer 33, the polarizing plate 34, and visco-adhesive The structure which laminated | stacked the adhesion layer 36 and the 2nd support plate 38 is mentioned.
　偏光板３４は、特定の方向に偏光した光のみを透過する偏光子を含む層である。偏光板３４は、任意に選択することができるが、例えばポリビニルアルコール（ＰＶＡ）フィルムを二色性染料により染色した染料系偏光板とすることが好適である。ＰＶＡフィルムは、一例として、クラレ製ＶＦ－ＰＳ＃７５００等を適用することができる。ＰＶＡフィルムは、例えば、延伸前に厚さ７５μｍのフィルムを延伸後において３０μｍ程度となるまで延伸する。 The polarizing plate 34 is a layer including a polarizer that transmits only light polarized in a specific direction. Although the polarizing plate 34 can be selected arbitrarily, it is preferable to use, for example, a dye-based polarizing plate obtained by dyeing a polyvinyl alcohol (PVA) film with a dichroic dye. As the PVA film, for example, VF-PS # 7500 manufactured by Kuraray can be applied. The PVA film is stretched, for example, to a thickness of about 30 μm after stretching a film of 75 μm in thickness before stretching.
　偏光板３４は、ＰＶＡフィルムの一面に形成される。偏光板３４は、偏光子の透過軸と平行な偏光光の視感度補正透過率Ｋｙが７０≦Ｋｙ≦９５であり、このときのＬ＊ａ＊ｂ＊表色系における偏光板の色相値は、ａ＊及びｂ＊がそれぞれ、－２≦ａ＊、ｂ＊≦２となるように、１種または２種以上の二色性を有する染料系材料によって構成することが好適である。すなわち、液晶パネルから出射される光は偏光板を透過した光となっているため偏光光となっており、ＨＵＤ用の偏光カバー１８を透過する際には透過軸に対して平行な偏光光の影響を大きく受ける。このため透過軸と平行な偏光光に対する透過光がニュートラルとなるように最適化することで表示の着色を抑えることが出来る。また、ＨＵＤ用の偏光カバー１８は太陽光にさらされる位置に設置されるために耐久性が必要となるため染料系偏光板が好適である。ヨウ素系偏光板においては、外光、熱等により偏光特性が消失する可能性があるため適していない。 The polarizing plate 34 is formed on one side of the PVA film. In the polarizing plate 34, the visibility correction transmittance Ky of polarized light parallel to the transmission axis of the polarizer is 70 ≦ Ky ≦ 95, and the hue value of the polarizing plate in the L * a * b * color system at this time is It is preferable to use a dye-based material having one or more dichroism so that a * and b * satisfy −2 ≦ a * and b * ≦ 2, respectively. That is, since light emitted from the liquid crystal panel is light transmitted through the polarizing plate, it is polarized light, and when transmitted through the polarizing cover 18 for HUD, the polarized light parallel to the transmission axis We are greatly affected. Therefore, coloring of the display can be suppressed by optimizing the transmitted light for polarized light parallel to the transmission axis to be neutral. Moreover, since the polarizing cover 18 for HUD needs durability in order to be installed in the position exposed to sunlight, a dye type polarizing plate is suitable. An iodine-based polarizing plate is not suitable because it may lose its polarization characteristics due to external light, heat, and the like.
　染料系材料は、アゾ化合物及び／又はその塩を含有することが好適である。例えば、以下の化学式を満たす染料系材料を用いることが好適である。
Figure JPOXMLDOC01-appb-C000001
 （１）式中Ｒ１、Ｒ２は各々独立に水素原子、低級アルキル基、低級アルコキシル基を示し、ｎは１又は２で示されるアゾ化合物及びその塩。
（２）Ｒ１、Ｒ２が各々独立に水素原子、メチル基、メトキシ基のいずれかである（１）記載のアゾ化合物及びその塩。
（３）Ｒ１、Ｒ２が水素原子である（１）記載のアゾ化合物及びその塩。 The dye-based material preferably contains an azo compound and / or a salt thereof. For example, it is preferable to use a dye-based material satisfying the following chemical formula.
Figure JPOXMLDOC01-appb-C000001
 (1) In the formula, R1 and R2 each independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group, and an azo compound in which n is 1 or 2 and a salt thereof.
(2) The azo compound and the salt thereof according to (1), wherein each of R 1 and R 2 independently represents a hydrogen atom, a methyl group or a methoxy group.
(3) The azo compound and the salt thereof according to (1), wherein R1 and R2 are hydrogen atoms.
　例えば、以下に示す工程で得られる材料を用いることが好適である。４－アミノ安息香酸１３．７部を水５００部に加え、水酸化ナトリウムで溶解する。得られた物質を冷却して１０℃以下で３５％塩酸３２部を加え、次に亜硝酸ナトリウム６．９部を加え、５～１０℃で１時間攪拌する。そこへアニリン－ω－メタンスルホン酸ソーダ２０．９部を加え、２０～３０℃で攪拌しながら、炭酸ナトリウムを加えてｐＨ３．５とする。さらに、攪拌してカップリング反応を完結させ、濾過して、モノアゾ化合物を得る。得られたモノアゾ化合物を水酸化ナトリウム存在下、９０℃で攪拌し、化学式（２）のモノアゾ化合物１７部を得る。
Figure JPOXMLDOC01-appb-C000002
 For example, it is preferable to use the material obtained in the following steps. Add 13.7 parts of 4-aminobenzoic acid to 500 parts of water and dissolve with sodium hydroxide. The resulting material is cooled and 32 parts of 35% hydrochloric acid is added below 10 ° C., then 6.9 parts of sodium nitrite are added and stirred at 5-10 ° C. for 1 hour. Thereto, 20.9 parts of sodium aniline-ω-methanesulfonate is added, and while stirring at 20-30 ° C., sodium carbonate is added to adjust to pH 3.5. The reaction is further stirred to complete the coupling reaction and filtered to obtain a monoazo compound. The obtained monoazo compound is stirred at 90 ° C. in the presence of sodium hydroxide to obtain 17 parts of a monoazo compound of the chemical formula (2).
Figure JPOXMLDOC01-appb-C000002
　化学式（２）のモノアゾ化合物１２部、４，４’－ジニトロスチルベン－２，２’－スルホン酸２１部を水３００部に溶解させた後、水酸化ナトリウム１２部を加え、９０℃で縮合反応させる。続いて、グルコース９部で還元し、塩化ナトリウムで塩析した後、濾過して化学式（３）で示されるアゾ化合物１６部を得る。
Figure JPOXMLDOC01-appb-C000003
 After dissolving 12 parts of monoazo compound of chemical formula (2) and 21 parts of 4,4'-dinitrostilbene-2,2'-sulfonic acid in 300 parts of water, add 12 parts of sodium hydroxide and conduct condensation reaction at 90 ° C. Let Subsequently, the resultant is reduced with 9 parts of glucose, salted out with sodium chloride, and filtered to obtain 16 parts of an azo compound represented by the chemical formula (3).
Figure JPOXMLDOC01-appb-C000003
　さらに、化合物（３）の染料を０．０１％、シー・アイ・ダイレクト・レッド８１を０．０１％、特許２６２２７４８号公報の実施例１において示されている下記構造式（４）で示される染料を０．０３％、特開昭６０－１５６７５９号公報の実施例２３において公開されている下記構造式（５）で示される染料０．０３％及び芒硝０．１％の濃度とした４５℃の水溶液に基板として厚さ７５μｍのポリビニルアルコール（ＰＶＡ）を４分間浸漬する。このフィルムを３％ホウ酸水溶液中において５０℃で５倍に延伸し、緊張状態を保ったまま水洗、乾燥する。これによって、中性色（平行位ではグレーで、直交位では黒色）となる染料系材料を得ることができる。また、これらの染料系材料を１種または２種以上用いることで、例えば、前記中性色の光学特性に比べ４００ｎｍ付近の透過率が高くすることや、平行位の色相がより色づきの少ない波形に調整することもできる。
Figure JPOXMLDOC01-appb-C000004
Figure JPOXMLDOC01-appb-C000005
 Furthermore, the dye of compound (3) is 0.01%, and C.I. Direct Red 81 is 0.01%, which is represented by the following structural formula (4) shown in Example 1 of Japanese Patent No. 2622748. The dye is 0.03%, the dye represented by the following structural formula (5) disclosed in Example 23 of JP-A-60-156759, and the concentration of 0.03% of the dye and 0.1% of mirabilite at 45 ° C. The substrate is immersed in an aqueous solution of polyvinyl alcohol (PVA) having a thickness of 75 μm for 4 minutes. This film is stretched 5 times at 50 ° C. in a 3% aqueous boric acid solution, washed with water and dried while maintaining tension. As a result, it is possible to obtain a dye-based material that is neutral (gray in parallel, black in orthogonal). In addition, by using one or more of these dye materials, for example, the transmittance near 400 nm can be made higher than the optical characteristics of the neutral color, or the waveform in which the hue at the parallel position is less colored It can also be adjusted to
Figure JPOXMLDOC01-appb-C000004
Figure JPOXMLDOC01-appb-C000005
　上記の視感度補正（平行光）透過率Ｋｙ、色相値ａ＊及びｂ＊が上記範囲である場合、投影される画像の白表示に黄色がかる現象を抑え、ニュートラルな色相を示し、偏光カバーの光学特性とパネルの光学特性が最適な関係になる。また、ディスプレイの光が遮られ、視認性が低下することを防ぐために、偏光板の視感度補正平行光透過率を７０％以上とすることが好適である。また、太陽光による熱負荷低減の効果が低下することを防ぐためには、偏光板の視感度補正平行光透過率を９５％以下とすることが好適である。 When the above-mentioned visibility correction (parallel light) transmittance Ky and hue values a * and b * are in the above-mentioned range, the phenomenon of yellowing on the white display of the projected image is suppressed, and neutral hue is exhibited. The optical characteristics and the optical characteristics of the panel are in an optimal relationship. Further, in order to prevent the light of the display from being blocked and the visibility from being lowered, it is preferable to set the visibility correction parallel light transmittance of the polarizing plate to 70% or more. Moreover, in order to prevent that the effect of the thermal load reduction by sunlight falls, it is suitable to make the visibility correction parallel light transmittance of a polarizing plate into 95% or less.
　また、投影されたＨＵＤの表示色が着色してしまうことを防ぐためには、偏光板の色相値ａ＊又はｂ＊の少なくとも一方において上記範囲外とすることが好適である。 Further, in order to prevent the display color of the projected HUD from being colored, it is preferable that at least one of the hue values a * and b * of the polarizing plate is out of the above range.
　なお、上記特性を満たす市販の染料系偏光板は、例えば、ポラテクノ社製の反射型ＬＣＤ用においてペーパーホワイトを呈するＳＨＣ－２１５Ｕ、又は、ブルー偏光板ＳＨＣ－Ｂ１５Ｕ、無彩色偏光板ＡＣＰ－１１５Ｕ等が挙げられる。 Commercially available dye-based polarizing plates satisfying the above characteristics are, for example, SHC-215U exhibiting paper white for reflective LCDs made by Polatechno, or blue polarizing plates SHC-B15U, achromatic polarizing plates ACP-115U, etc. Can be mentioned.
　また、偏光板３４は、上記製造方法で得られた偏光膜を基材に貼り合わせた構造としてもよい。基材は、偏光板３４の保護層となる部材である。基材は、任意に選択することができるが、例えばトリアセチルセルロース（ＴＡＣ）フィルム、アクリルフィルム、環状オレフィン系フィルム等を用いることが好適である。一例として、ＴａｃＢｒｉｇｈｔ社製Ｐ９６０ＧＬ等を適用することができる。基材の厚さは、これに限定されるものではないが、２０μｍ以上２００μｍ以下とすることが好適である。熱や湿度に対する光学変化が少なく、且つ収縮や反りを抑えた偏光子を得るためには、偏光膜の両面に基材を設けることが好適である。 The polarizing plate 34 may have a structure in which the polarizing film obtained by the above-described manufacturing method is bonded to a base material. The base material is a member to be a protective layer of the polarizing plate 34. Although a base material can be selected arbitrarily, it is suitable to use a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin film, etc., for example. As an example, TacBright P960GL or the like can be applied. The thickness of the substrate is not limited to this, but is preferably 20 μm or more and 200 μm or less. In order to obtain a polarizer having a small optical change with respect to heat and humidity and with reduced shrinkage and warpage, it is preferable to provide a substrate on both sides of the polarizing film.
　粘接着層３２は、偏光板３４と第１支持板３０とを貼り合わせるための層である。また、粘接着層３６は、偏光板３４と第２支持板３８とを貼り合わせるための層である。粘接着層３２及び粘接着層３６に用いられる粘着剤又は接着剤は、アクリル系、またはポリエステル系であれば特に限定されるものではなく、さらにこれら以外のものを使用してもよい。粘接着層３２及び粘接着層３６は、偏光板３４と第１支持板３０又は第２支持板３８との間に熱応力等の力が働いた場合にその力を吸収（緩衝）させるような材料とすることで発生する偏光カバーの反りを軽減させることができる。その場合、粘着剤を使用する方が好適であり、粘着層の膜厚を、１０μｍ以上５０μｍ以下とすることが好適である。 The pressure-sensitive adhesive layer 32 is a layer for bonding the polarizing plate 34 and the first support plate 30. In addition, the adhesive and pressure-sensitive adhesive layer 36 is a layer for bonding the polarizing plate 34 and the second support plate 38 together. The pressure-sensitive adhesive or adhesive used for the adhesive and pressure-sensitive adhesive layer 32 and the adhesive and pressure-sensitive adhesive layer 36 is not particularly limited as long as it is acrylic or polyester, and materials other than these may be used. The pressure-sensitive adhesive layer 32 and the pressure-sensitive adhesive layer 36 absorb (buffer) a force, such as a thermal stress, acting between the polarizing plate 34 and the first support plate 30 or the second support plate 38. By using such a material, it is possible to reduce the warpage of the polarizing cover that is generated. In such a case, it is preferable to use a pressure-sensitive adhesive, and the thickness of the pressure-sensitive adhesive layer is preferably 10 μm or more and 50 μm or less.
　また、粘接着層３２は、粘着剤または接着剤に染料または顔料等の添加剤を添加したものとしてもよい。添加剤は、５００～６００ｎｍの光の吸収率が高いものを用いることが好ましい。これにより、偏光板の色相がニュートラルになるように最適化することができる。 Further, the adhesive and pressure-sensitive adhesive layer 32 may be obtained by adding an additive such as a dye or a pigment to an adhesive or an adhesive. As the additive, it is preferable to use one having a high light absorption rate of 500 to 600 nm. Thereby, the hue of the polarizing plate can be optimized to be neutral.
　また、図３に示した構成のように位相差板３１を設けてもよい。位相差板３１は、その光軸に対して平行な偏光成分と垂直な偏光成分との間で位相差を生じさせる部材である。位相差板３１は、表示器１２から出力された表示光に対して、出力側に配置することが好ましい。位相差板３１は、粘接着層３３を介して偏光板３４の表面に張り付けられる。 Moreover, you may provide the phase difference plate 31 like the structure shown in FIG. The retardation plate 31 is a member that causes a phase difference between a polarization component parallel to the optical axis and a polarization component perpendicular to the optical axis. The retardation plate 31 is preferably arranged on the output side of the display light output from the display 12. The retardation plate 31 is attached to the surface of the polarizing plate 34 via the adhesive layer 33.
　ＨＵＤ装置において、車両運転者が偏光サングラスを着用していた場合、投影された画像を明瞭に視認できない虞がある。即ち、偏光サングラスは水平方向の直線偏光を遮る特性があり、２分の１波長板にて水平方向に調整された直線偏光である表示光が偏光サングラスで遮られるため、車両運転者が視認する虚像の輝度が低くなるおそれがある。位相差板３１は、表示器１２が発した直線偏光である表示光の偏光軸を回転させ、水平方向の偏光を低減して、虚像の視認性を向上させることができる。したがって、車両運転者が偏光サングラスを着用していた場合であっても、視認性が低下する虞が少ないＨＵＤ装置とすることができる。 In the HUD device, if the vehicle driver is wearing polarized sunglasses, there is a risk that the projected image may not be clearly visible. That is, polarized sunglasses have the property of blocking linearly polarized light in the horizontal direction, and display light which is linearly polarized light adjusted in the horizontal direction by the half-wave plate is blocked by the polarized sunglasses, so the vehicle driver sees it. The brightness of the virtual image may be low. The retardation plate 31 can rotate the polarization axis of display light which is linear polarization emitted from the display 12, reduce polarization in the horizontal direction, and improve the visibility of a virtual image. Therefore, even when the vehicle driver wears polarized sunglasses, it is possible to provide a HUD device that is less likely to reduce visibility.
　第１支持板３０及び第２支持板３８は、偏光カバー１８を機械的に支持するための部材である。すなわち、第１支持板３０は、粘接着層３２を介して偏光板３４の表面に貼り付けられ、又は、位相差板３１が設けられている構成では粘接着層３２を介して位相差板３１に貼り付けられる。第２支持板３８は、粘接着層３６を介して偏光板３４の裏面に貼り付けられる。 The first support plate 30 and the second support plate 38 are members for mechanically supporting the polarization cover 18. That is, the first support plate 30 is attached to the surface of the polarizing plate 34 via the adhesive layer 32, or in the configuration in which the retardation plate 31 is provided, the retardation is provided via the adhesive layer 32. It is stuck on the board 31. The second support plate 38 is attached to the back surface of the polarizing plate 34 via the adhesive layer 36.
　第１支持板３０及び第２支持板３８は、難燃性プラスチック板を含むことが好適である。すなわち、第１支持板３０及び第２支持板３８を難燃性プラスチック板で構成とすることによって、自動車等に搭載するための規格にあったＨＵＤ装置１００を実現することができる。 The first support plate 30 and the second support plate 38 preferably include a flame retardant plastic plate. That is, by forming the first support plate 30 and the second support plate 38 with a flame-retardant plastic plate, the HUD device 100 conforming to the standard for mounting on a car or the like can be realized.
　ここで、第１支持板３０及び第２支持板３８は、偏光カバー１８を透過した像に歪みを生じさせないために表面が平坦なものを使用することが好適である。また、偏光カバー１８を透過した光（偏光光）が乱されないように、透過光に位相差を生じさせないような低位相差のものを使用することが好適である。 Here, it is preferable that the first support plate 30 and the second support plate 38 have a flat surface so as not to distort an image transmitted through the polarization cover 18. Further, it is preferable to use a low phase difference light which does not cause a phase difference in the transmitted light so that the light (polarized light) transmitted through the polarization cover 18 is not disturbed.
　例えば、第１支持板３０及び第２支持板３８は、ポリカーボネイト（ＰＣ）板、アクリル樹脂板、セルロース板、ナイロン板等とすることが好適である。また、第１支持板３０及び第２支持板３８は、可燃材料を不燃処理した材料としてもよい。偏光カバー１８の機械的な強度を考慮すると、第１支持板３０及び第２支持板３８は、それぞれ５０μｍ以上の厚さを有することが好適である。 For example, the first support plate 30 and the second support plate 38 are preferably made of polycarbonate (PC) plate, acrylic resin plate, cellulose plate, nylon plate or the like. In addition, the first support plate 30 and the second support plate 38 may be materials obtained by incombustible treatment of combustible materials. In consideration of the mechanical strength of the polarization cover 18, it is preferable that the first support plate 30 and the second support plate 38 each have a thickness of 50 μm or more.
　また、第１支持板３０及び第２支持板３８は、単層ではなく、複数の層を積層した構造としてもよい。例えば、図４に示すように、主板Ａをポリカーボネイト（ＰＣ）板とし、それに副板Ｂとしてアクリル樹脂板を積層した構造とすることが好適である。アクリル樹脂板は、例えば、ポリメタクリル酸メチル（ＰＭＭＡ）等とすることができる。 In addition, the first support plate 30 and the second support plate 38 may have a structure in which a plurality of layers are stacked instead of a single layer. For example, as shown in FIG. 4, it is preferable to use a structure in which the main plate A is a polycarbonate (PC) plate and an acrylic resin plate is stacked thereon as a sub plate B. The acrylic resin plate can be, for example, polymethyl methacrylate (PMMA) or the like.
　さらに、第１支持板３０及び第２支持板３８には、表面保護のためにＨＣ（Ｈａｒｄ　Ｃｏａｔ）、ＡＧ（Ａｎｔｉ－Ｇｌａｒｅ）、ＡＲ（Ａｎｔｉ－Ｒｅｆｌｅｃｔｉｏｎ）、ＬＲ（Ｌｏｗ－Ｒｅｆｌｅｃｔｉｏｎ）等の保護層Ｃを設けてもよい。ＨＣは、ＪＩＳ　Ｋ５６００－５－４に規定する鉛筆硬度試験（７．４８Ｎ荷重）で、ＨＢ以上の硬度を示すものが望ましい。 Furthermore, the first support plate 30 and the second support plate 38 are protected by HC (Hard Coat), AG (Anti-Glare), AR (Anti-Reflection), LR (Low-Reflection), etc. for surface protection. A layer C may be provided. It is desirable that HC exhibits a hardness of HB or more in a pencil hardness test (7.48 N load) specified in JIS K5600-5-4.
　ただし、偏光カバー１８の曲がりの発生を抑制するために、これらの副板Ｂや保護層Ｃを設ける場合には偏光カバー１８の膜厚方向に沿って上下対称の構造とすることが好適である。 However, in order to suppress the occurrence of bending of the polarization cover 18, in the case where the sub-plate B and the protective layer C are provided, it is preferable to have a vertically symmetrical structure along the film thickness direction of the polarization cover 18. .
　偏光カバー１８をＨＵＤ装置１００に搭載する際には、表示器１２から出力されて偏光カバー１８を透過する光（直線偏光光）の偏光方向と偏光カバー１８の偏光板３４の偏光方向とが平行になるように配置することが好適である。 When the polarization cover 18 is mounted on the HUD device 100, the polarization direction of light (linearly polarized light) output from the display 12 and transmitted through the polarization cover 18 is parallel to the polarization direction of the polarization plate 34 of the polarization cover 18. It is preferable to arrange so that
　これにより、ＨＵＤ装置１００の外部から偏光カバー１８に入射する光（太陽光等）を大幅にカットできると共に、表示器１２から出力される光の大部分を透過できる偏光カバー１８を提供することができる。したがって、画像の視認性を高めたＨＵＤ装置１００を実現することができる。 Thus, it is possible to significantly cut light (such as sunlight) incident on the polarization cover 18 from the outside of the HUD device 100 and to provide the polarization cover 18 capable of transmitting most of the light output from the display 12. it can. Therefore, the HUD device 100 with improved image visibility can be realized.
　また、偏光板３４の表面及び裏面を第１支持板３０及び第２支持板３８で支持することによって偏光カバー１８の機械的な強度を高めることができる。 Further, the mechanical strength of the polarizing cover 18 can be enhanced by supporting the front and back surfaces of the polarizing plate 34 by the first support plate 30 and the second support plate 38.
　さらに、偏光板３４を表面側及び裏面側から板厚方向に対照となるように第１支持板３０及び第２支持板３８で挟み込むことによって、偏光カバー１８に熱応力が加わったときの反りを抑制することができる。すなわち、表示器１２からの光や外部からの太陽光の照射によって偏光カバー１８が加熱された場合に、偏光板３４の表面側において第１支持板３０との界面に発生する応力と偏光板３４の裏面側において第２支持板３８との界面に発生する応力とをバランスさせることで偏光カバー１８に生ずる反り（曲がり）や変形を抑制することができる。 Furthermore, by sandwiching the polarizing plate 34 with the first support plate 30 and the second support plate 38 so as to be contrasted from the front side and the back side in the thickness direction, warpage when a thermal stress is applied to the polarizing cover 18 is obtained. It can be suppressed. That is, when the polarization cover 18 is heated by irradiation of light from the display 12 or sunlight from the outside, stress generated at the interface with the first support plate 30 on the surface side of the polarization plate 34 and the polarization plate 34 By balancing the stress generated at the interface with the second support plate 38 on the rear surface side of the polarizing plate 18, it is possible to suppress the warpage (bending) and deformation that occur in the polarizing cover 18.
　また、第１支持板３０及び第２支持板３８は、難燃性プラスチック板を含むことが好適であるとしたが、具体的には、ポリカーボネート（ＰＣ）に難燃性を付与する手段として、金属酸化物、ハロゲン、リンの少なくとも１つを混合させる方法、又は、難燃性化させた材料を用いてコーティングあるいは共押しすることが好適である。価格、色づき、ポリカーボネイト（ＰＣ）の特性及び環境への影響を考慮すると、ハロゲンのうち臭素を用いることがより好適である。ポリカーボネート（ＰＣ）に金属酸化物、ハロゲン、リンの少なくとも１つを混合させる場合、選択した原料をポリカーボネート（ＰＣ）に混練させることが好適である。 Further, although it is preferable that the first support plate 30 and the second support plate 38 include a flame retardant plastic plate, specifically, as a means for imparting flame retardancy to polycarbonate (PC), It is preferable to coat or co-press using a method of mixing at least one of metal oxides, halogens, and phosphorus, or a flame-retardant material. Among the halogens, it is more preferable to use bromine in consideration of cost, coloring, properties of polycarbonate (PC) and environmental impact. When the polycarbonate (PC) is mixed with at least one of metal oxide, halogen and phosphorus, it is preferable to knead the selected raw material into the polycarbonate (PC).
　以上説明した本実施形態の作用効果を以下に説明する。 The effects and advantages of the present embodiment described above will be described below.
（実施例１，比較例１，２）
　例えば、偏光板３４としてポラテクノ社製のＳＨＣ－２１５Ｕ（膜厚２１５μｍ）を適用し、偏光板３４の両面に第１支持板３０及び第２支持板３８として三菱ガス化学社製のＭＲＦ０８Ｕを粘接着層３２及び粘接着層３６により貼り合わせて偏光カバー１８を構成することができる。この偏光カバー１８では、自然光（太陽光）の透過率は約４４％であり、約５６％をカットすることができる。一方、直線偏光光の透過率は約８４％であり、表示器１２からの出射光は約８４％透過できる。 Example 1 and Comparative Examples 1 and 2
For example, SHC-215U (film thickness 215 μm) made by Polatechno as the polarizing plate 34 is applied, and MRF 08U made by Mitsubishi Gas Chemical Co., Ltd. as the first support plate 30 and the second support plate 38 is attached to both sides of the polarizing plate 34 The polarizing cover 18 can be configured by laminating the adhesive layer 32 and the adhesive layer 36. The polarization cover 18 has a natural light (sunlight) transmittance of about 44%, and can cut about 56%. On the other hand, the transmittance of linearly polarized light is about 84%, and the light emitted from the display 12 can be transmitted about 84%.
　当該偏光カバー１８を１０５℃で２４時間加熱した場合に反りや変形は生じなかった。一方、第１支持板３０又は第２支持板３８の一方のみを設けた場合、１０５℃で２４時間加熱した場合には４０ｍｍ程度の曲がりが発生した。 When the polarizing cover 18 was heated at 105 ° C. for 24 hours, no warpage or deformation occurred. On the other hand, in the case where only one of the first support plate 30 and the second support plate 38 was provided, bending at about 40 mm occurred when heating was performed at 105 ° C. for 24 hours.
　また、偏光カバー１８にヨウ素系の偏光膜を適用した場合、９０℃以上の加熱によって偏光膜に変色が生じて光の透過性が低下してしまう。これに対して、本実施の形態のように、偏光板３４として染料系材料を用いることによって、９０℃以上の使用環境であっても偏光カバー１８の変形を抑制しつつ、変色することなく高い光透過性を維持することができる。 In addition, when an iodine-based polarizing film is applied to the polarizing cover 18, the polarizing film is discolored due to heating at 90 ° C. or more, and the light transmittance is reduced. On the other hand, as in the present embodiment, by using a dye-based material as the polarizing plate 34, the deformation of the polarization cover 18 is suppressed even in a use environment of 90 ° C. or more, and the color is high without discoloration. Optical transparency can be maintained.
　以下、第１支持板３０及び第２支持板３８に難燃性プラスチック板を適用した実施例１及びそれに対する比較例１，２について示す。実施例では、上記実施の形態における第１支持板３０及び第２支持板３８として、ポリカーボネート（ＰＣ）に金属酸化物、臭素、リン、ハロゲンの少なくとも１つを混合させた難燃性ＰＣを適用した。これに対して、比較例１では、第１支持板３０及び第２支持板３８として一般的なポリカーボネイト（ＰＣ）（ＳＡＢＩＣ製　ＬＥＸＡＮ８０１０Ｑ）を適用した。また、比較例２では、第１支持板３０として難燃性ＰＣを適用し、第２支持板３８を設けない構成とした。 Hereinafter, Example 1 in which a flame retardant plastic plate is applied to the first support plate 30 and the second support plate 38 and Comparative Examples 1 and 2 for the same will be described. In the embodiment, as the first support plate 30 and the second support plate 38 in the above embodiment, a flame retardant PC obtained by mixing polycarbonate (PC) with at least one of metal oxide, bromine, phosphorus and halogen is applied. did. On the other hand, in Comparative Example 1, a general polycarbonate (PC) (LEXAN 8010Q made by SABIC) was applied as the first support plate 30 and the second support plate 38. In Comparative Example 2, a flame retardant PC was applied as the first support plate 30 and the second support plate 38 was not provided.
　実施例では、米国の連邦自動車安全基準（ＦＭＶＳＳ）における自動車の内装に対する燃焼性試験（Ｎｏ．３０２）において標線前で自己消火された。これに対して、比較例１では、燃焼性試験（Ｎｏ．３０２）をクリアできなかった。また、比較例２では、第１支持板３０を設けた側からの着火については燃焼性試験（Ｎｏ．３０２）をクリアしたが、第２支持板３８を設けなかった偏光板３４側からの着火については燃焼性試験（Ｎｏ．３０２）をクリアできなかった。 In the example, it was self-extinguishing before the marking line in the flammability test (No. 302) for the interior of a car according to the United States Federal Motor Vehicle Safety Standard (FMVSS). On the other hand, in Comparative Example 1, the flammability test (No. 302) could not be cleared. In Comparative Example 2, the flammability test (No. 302) was cleared for the ignition from the side provided with the first support plate 30, but the ignition from the side of the polarizing plate 34 where the second support plate 38 was not provided The flammability test (No. 302) could not be cleared.
　また、実施例１、比較例１及び比較例２において１０５℃の加熱を４８時間行った場合の反りについて確認した。実施例及び比較例１では、形状の変化はみられなかった。すなわち、実施例及び比較例１では、曲がりやうねりは見られなかった。これに対して、比較例２では、形状の大きな変化がみられた。 In addition, in Example 1, Comparative Example 1 and Comparative Example 2, warpage when heating at 105 ° C. for 48 hours was confirmed. In Example and Comparative Example 1, no change in shape was observed. That is, in the example and the comparative example 1, no bending or undulation was observed. On the other hand, in Comparative Example 2, a large change in shape was observed.
　なお、一般的なポリカーボネイト（ＰＣ）（例えば、ＳＡＢＩＣ製　ＬＥＸＡＮ８０１０Ｑ）よりも金属酸化物、ハロゲン、リンの少なくとも１つの混合量が多いものであれば当該効果はより顕著となった。 The effect is more remarkable if the mixing amount of at least one of metal oxide, halogen, and phosphorus is larger than that of general polycarbonate (PC) (for example, LEXAN 8010Q manufactured by SABIC).
　以上のように、第１支持板３０及び第２支持板３８に難燃性プラスチック板を適用することで、米国の連邦自動車安全基準（ＦＭＶＳＳ）における自動車の内装に対する燃焼性試験（Ｎｏ．３０２）の基準をクリアすることができた。また、従来は防ぐことができなかった、曲がりやうねりを抑制することができた。 As described above, by applying the flame retardant plastic plate to the first support plate 30 and the second support plate 38, the flammability test for the interior of a car according to the United States Federal Motor Vehicle Safety Standard (FMVSS) (No. 302) I was able to clear the criteria. In addition, it was possible to suppress bending and undulation that could not be prevented conventionally.
　次に、偏光特性が付与された偏光カバーの装着によるＨＵＤ表示像の色相の確認方法について説明するが、ＨＵＤ装置の表示原理に基づき簡易的に効果を検証するための方法であり、以下に限定されるものではない。 Next, although the confirmation method of the hue of the HUD display image by wearing of the polarization | polarized-light characteristic to which the polarization characteristic was provided is demonstrated, it is a method for verifying an effect simply based on the display principle of a HUD apparatus. It is not something to be done.
（実施例２）
　ポラテクノ社製染料系偏光板ＳＨＣ－２１５Ｕを偏光板として使用し、当該偏光板を分光光度計（日本分光社製Ｖ－７１００）で測定を行ったところ、Ｋｙ＝８４．５、ａ＊＝－０．５、ｂ＊＝０．４５であった。この偏光板の両辺のＴＡＣ面に厚みが２５μのアクリル系粘着トランスファーを介して、ポリカーボネイトフィルム（三菱ガス化学社製のＭＲＦ０８Ｕ）を貼合することで偏光部材を作製した。 (Example 2)
A dye-based polarizing plate SHC-215U manufactured by Polatechno Co., Ltd. is used as a polarizing plate, and the polarizing plate is measured using a spectrophotometer (V-7100 manufactured by JASCO Corporation). Ky = 84.5, a * =- 0.5 and b * = 0.45. A polarizing film was produced by pasting a polycarbonate film (MRF08U manufactured by Mitsubishi Gas Chemical Co., Ltd.) to an TAC-based film on both sides of this polarizing plate through an acrylic adhesive transfer having a thickness of 25 μ.
［ＨＵＤ表示色の色相測定］ 
　市販のヨウ素系偏光板からなるＩＰＳ液晶モニター（ＫＥＩＡＮ製、ＬＥＤバックライト、白色輝度２５０ｃｄ／ｃｍ２）を駆動させ、暗室下で色彩輝度計（コニカミノルタ製ＣＡ－２０００）を用い、正面０度方位で５０ｃｍの高さにおける全画面白表示時の色相を計測し、ＸＹＺ表色系（ＣＩＥ１９３１表色系）に基づく色度値ｘ及びｙを算出した。 [Hue measurement of HUD display color]
An IPS liquid crystal monitor (manufactured by KEIAN, manufactured by KEIAN, LED backlight, white luminance 250 cd / cm 2 ) consisting of a commercially available iodine polarizing plate is driven, and a color luminance meter (CA-2000 made by Konica Minolta) is used in a dark room to face 0 ° The hue at the time of full screen white display at a height of 50 cm in azimuth was measured, and chromaticity values x and y based on the XYZ color system (CIE 1931 color system) were calculated.
　上記偏光部材をＨＵＤ用の偏光カバー１８として、偏光カバー１８の偏光板の吸収軸と上記モニターのフロント側の偏光板の吸収軸が平行位となるように設置した。上記モニターを駆動させ、暗室下で色彩輝度計（コニカミノルタ製ＣＡ－２０００）を用い、正面０度方位で５０ｃｍの高さにおける全画面白表示時の色相を計測し、ＸＹＺ表色系（ＣＩＥ１９３１表色系）に基づく色度値ｘ及びｙを算出した。測定した液晶モニターのみの色相からＨＵＤ用の偏光カバー１８を設置した状態での色相を差し引くことで色相の変化を算出した。 The polarizing member was set as the polarizing cover 18 for HUD so that the absorption axis of the polarizing plate of the polarizing cover 18 and the absorption axis of the polarizing plate on the front side of the monitor were parallel to each other. The above monitor is driven, and using a color luminance meter (CA-2000 made by Konica Minolta) in a dark room, measure the hue at the time of full screen white display at a height of 50 cm with a front 0 degree azimuth, XYZ color system (CIE1931 The chromaticity values x and y were calculated based on the color system. The hue change was calculated by subtracting the hue when the polarizing cover 18 for HUD was installed from the measured hue of the liquid crystal monitor alone.
（実施例３）
　ポラテクノ社製染料系カラー偏光板ＳＨＣ－Ｂ１５Ｕを偏光板として用い、実施例１と同様に分光測定をしたところ、Ｋｙ＝８６．０、ａ＊＝－１．１、ｂ＊＝０．９７であった。これを実施例１と同じ方法で、ＨＵＤ用の偏光カバー１８と同構成のものを作製した。 (Example 3)
A dye-based color polarizing plate SHC-B15U manufactured by Polatechno Co., Ltd. was used as a polarizing plate, and when spectroscopic measurement was performed in the same manner as in Example 1, Ky = 86.0, a * =-1.1, b * = 0.97. there were. This was manufactured in the same manner as in Example 1 and in the same configuration as the polarizing cover 18 for HUD.
　当該偏光カバー１８を用い、実施例２と同様にＩＰＳ液晶モニター上に設置し、色相測定を行い、ＨＵＤ用偏光カバーによる色相変化を算出した。 The polarizing cover 18 was set on the IPS liquid crystal monitor in the same manner as in Example 2, and the hue was measured to calculate the hue change by the polarizing cover for HUD.
（実施例４）
　実施例２のＩＰＳ液晶モニターの液晶パネル両辺に実装されているヨウ素偏光板をポラテクノ製染料系偏光板ＧＨＣ－１２Ｕ（Ｙｓ４０．５％、Ｐｙ９９．９％）に貼り換え、実施例２で作製したＨＵＤ用の偏光カバー１８を設置し、実施例２と同様に色相測定を行い、偏光カバー１８による色相変化を算出した。 (Example 4)
The iodine polarizing plate mounted on both sides of the liquid crystal panel of the IPS liquid crystal monitor of Example 2 was changed to a Polatechno dye-based polarizing plate GHC-12U (Ys 40.5%, Py99.9%) and manufactured in Example 2. A polarizing cover 18 for HUD was installed, and the hue was measured in the same manner as in Example 2, and the hue change by the polarizing cover 18 was calculated.
（実施例５）
　実施例４で設定したＩＰＳ液晶モニターの液晶パネル上に、実施例３で作製したＨＵＤ用の偏光カバー１８を設置し、実施例１と同様に色相測定を行い、偏光カバー１８による色相変化を算出した。 (Example 5)
On the liquid crystal panel of the IPS liquid crystal monitor set in Example 4, the polarizing cover 18 for HUD manufactured in Example 3 is placed, and the hue is measured in the same manner as in Example 1, and the hue change by the polarizing cover 18 is calculated. did.
（比較例３）
　ポラテクノ製染料系偏光板ＥＨＣ－１１５Ｕを使用した。分光測定より、Ｋｙ＝８５．６％、ａ＊＝－０．２６、ｂ＊＝２．６６であった。これを実施例１と同じ方法で、ＨＵＤ用偏光カバーと同構成のものを作製した。当該偏光カバーを用い、実施例１と同様にＩＰＳ液晶モニター上に設置し、色相測定を行い、偏光カバーによる色相変化を算出した。 (Comparative example 3)
A dye-based polarizing plate EHC-115U manufactured by Polatechno was used. According to spectroscopic measurement, Ky was 85.6%, a * =-0.26, b * = 2.66. In the same manner as in Example 1, a HUD polarizing cover of the same configuration was produced. It installed on the IPS liquid crystal monitor like Example 1 using the said polarization cover, the hue measurement was performed, and the hue change by a polarization cover was computed.
（比較例４）
　比較例３のＨＵＤ用偏光カバーを用い、実施例４で設定したＩＰＳ液晶モニター上に設置し、色相測定を行い、偏光カバーによる色相変化を算出した。 (Comparative example 4)
The HUD polarizing cover of Comparative Example 3 was installed on the IPS liquid crystal monitor set in Example 4, the hue was measured, and the hue change due to the polarizing cover was calculated.
　表１に各実施例及び比較例における光学特性及び色相測定を行った結果を示す。
Figure JPOXMLDOC01-appb-T000006
 Table 1 shows the results of measurement of optical characteristics and hue in each of the examples and the comparative examples.
Figure JPOXMLDOC01-appb-T000006
　表１におけるΔＬはＨＵＤ用偏光カバーを用いた場合の輝度の変化、Δｘ、ΔｙはＨＵＤ用偏光カバーによる色度の変化を示す。実施例２、実施例３及び比較例３は、当該開示の偏光カバーと従来の中性色を呈する染料系偏光板を用いた偏光カバーを用いた場合の色相変化の比較である。比較例１では、偏光カバーを用いることよって、Δｘ及びΔｙ共にプラスにシフトし、白表示が黄味側に着色している。一方、実施例２及び実施例３では、Δｘ及びΔｙ共に変化量は小さく、比較例３よりも偏光カバーの使用による色相変化は抑えられている。 In Table 1, ΔL indicates the change in luminance when the HUD polarizing cover is used, and Δx and Δy indicate the change in chromaticity due to the HUD polarizing cover. Example 2, Example 3 and Comparative Example 3 are comparisons of hue changes when using the polarizing cover of the disclosure and the polarizing cover using the conventional dye-based polarizing plate exhibiting a neutral color. In Comparative Example 1, by using the polarization cover, both Δx and Δy shift to the plus side, and the white display is colored to the yellowish side. On the other hand, in Example 2 and Example 3, the change amounts of both Δx and Δy are small, and the hue change due to the use of the polarization cover is suppressed more than in Comparative Example 3.
　また、車載向けのＨＵＤ用液晶パネルには高耐熱性が要求されており、液晶パネルの偏光部材には沃素系偏光板の代りに耐久性の高い染料偏光板を適用することが検討されている。そのため、一般的な染料系偏光板からなるカバーが用いられると、表示像の黄色味が一層強くなることが懸念される。実施例４、実施例５及び比較例４では、液晶パネルの偏光部材に染料系偏光板を用いた場合である。比較例４に比べ、実施例４及び実施例５は、Δｘ及びΔｙの変化が小さくなっており、白表示の黄色味が十分に抑えられることが分かった。 In addition, high heat resistance is required for automotive liquid crystal panels for HUDs, and it has been studied to use a highly durable dye polarizer instead of an iodine polarizer as the polarizing member of the liquid crystal panel. . Therefore, when a cover made of a general dye-based polarizing plate is used, there is a concern that the yellowness of the displayed image may be further intensified. In Example 4, Example 5, and Comparative Example 4, the dye-based polarizing plate is used as the polarizing member of the liquid crystal panel. As compared with Comparative Example 4, in Examples 4 and 5, changes in Δx and Δy were small, and it was found that the yellowness of white display was sufficiently suppressed.
　以上のように、従来の中性色を呈する染料系偏光板からなる偏光カバーを適用すると、表示色が黄色味を帯びてしまうが、当該開示のカバーを用いることで、表示色の色相変化を小さくしディスプレイ本来の表示色を再現することができる。 As described above, when a polarization cover made of a dye-based polarizing plate exhibiting a conventional neutral color is applied, the display color becomes yellowish, but by using the cover of the disclosure, the hue change of the display color can be obtained. A smaller display can reproduce the original display color of the display.
　１０　筐体、１２　表示器、１４　平面ミラー、１６　凹面ミラー、１８　偏光カバー、２０　投影部、３０　第１支持板、３１　位相差板、３２　粘接着層、３３　粘接着層、３４　偏光板、３６　粘接着層、３８　第２支持板、１００　ヘッドアップディスプレイ装置。
  DESCRIPTION OF SYMBOLS 10 housing | casing 12 display device 14 plane mirror 16 concave mirror 18 polarization cover 20 projection part 30 1st support plate 31 retardation plate 32 adhesive layer 33 adhesive layer 34 polarizing plate , 36 adhesive layer, 38 second support plate, 100 head-up display device.

Claims (7)

  1. 　偏光部材であって、
    　偏光子を有し、偏光子の透過軸と平行な偏光光の視感度補正透過率Ｋｙが７０≦Ｋｙ≦９５であり、色相ａ＊及びｂ＊が－２≦ａ＊、ｂ＊≦２である染色系偏光材料を用いた偏光板と、
    　前記偏光板の表面側に粘接着層を介して貼り合わされた第１支持板と、
    　前記偏光板の裏面側に粘接着層を介して貼り合わされた第２支持板と、
    を備える。     A polarization member,
    It has a polarizer, and the visibility correction transmittance Ky of polarized light parallel to the transmission axis of the polarizer is 70 ≦ Ky ≦ 95, and the hues a * and b * are −2 ≦ a * and b * ≦ 2 A polarizing plate using a dye-based polarizing material,
    A first support plate bonded to the surface side of the polarizing plate via an adhesive layer;
    A second support plate attached to the back surface side of the polarizing plate via an adhesive layer;
    Equipped with
  2. 　請求項１に記載の偏光部材であって、
    　前記第１支持板及び前記第２支持板は、難燃性プラスチック板を含む。     The polarization member according to claim 1, wherein
    The first support plate and the second support plate include flame retardant plastic plates.
  3. 　表示装置であって、
    　請求項１に記載の偏光部材と、
    　画像を出力する表示器と、
    　前記表示器を収納する筐体と、を備える。     A display device,
    A polarization member according to claim 1;
    A display for outputting an image,
    And a case for housing the display.
  4. 　表示装置であって、
    　請求項２に記載の偏光部材と、
    　画像を出力する表示器と、
    　前記表示器を収納する筐体と、を備える。     A display device,
    A polarization member according to claim 2;
    A display for outputting an image,
    And a case for housing the display.
  5. 　ヘッドアップディスプレイであって、
    　請求項１に記載の偏光部材と、
    　画像を出力する表示器と、
    　前記表示器を収納する筐体と、を備える。     A head-up display,
    A polarization member according to claim 1;
    A display for outputting an image,
    And a case for housing the display.
  6. 　ヘッドアップディスプレイであって、
    　請求項２に記載の偏光部材と、
    　画像を出力する表示器と、
    　前記表示器を収納する筐体と、を備える。     A head-up display,
    A polarization member according to claim 2;
    A display for outputting an image,
    And a case for housing the display.
  7. 　ヘッドアップディスプレイであって、
    　請求項３に記載の偏光部材と、
    　画像を出力する表示器と、
    　前記表示器を収納する筐体と、を備える。     A head-up display,
    A polarization member according to claim 3;
    A display for outputting an image,
    And a case for housing the display.
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