WO2017138442A1 - Afficheur à miroir - Google Patents

Afficheur à miroir Download PDF

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Publication number
WO2017138442A1
WO2017138442A1 PCT/JP2017/003891 JP2017003891W WO2017138442A1 WO 2017138442 A1 WO2017138442 A1 WO 2017138442A1 JP 2017003891 W JP2017003891 W JP 2017003891W WO 2017138442 A1 WO2017138442 A1 WO 2017138442A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
plate
cholesteric liquid
mirror
display
Prior art date
Application number
PCT/JP2017/003891
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English (en)
Japanese (ja)
Inventor
博之 箱井
坂井　彰
箕浦　潔
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シャープ株式会社
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Publication date
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Publication of WO2017138442A1 publication Critical patent/WO2017138442A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a mirror display. More specifically, the present invention relates to a mirror display that achieves both a mirror mode that functions as a mirror and a display mode that displays an image.
  • a multilayer reflective polarizing plate or a reflective polarizing plate in which a cholesteric liquid crystal film and a ⁇ / 4 plate are combined has been used.
  • the multilayer reflective polarizing plate has a function of reflecting polarized light in a direction parallel to the reflection axis of incident light and transmitting polarized light in a direction orthogonal to the reflection axis. Therefore, the multilayer reflective polarizing plate can transmit light emitted from the liquid crystal display to the viewer as display light, and can reflect external light in a direction orthogonal to the polarization direction of the display light to the viewer. .
  • a reflective polarizing plate combining a cholesteric liquid crystal layer and a ⁇ / 4 plate reflects right circularly polarized light (or left circularly polarized light) out of incident light and transmits left circularly polarized light (or right circularly polarized light).
  • the linearly polarized light emitted from the liquid crystal display is converted into left-handed circularly polarized light (or right-handed circularly polarized light) by a ⁇ / 4 plate so that the display light is transmitted to the viewer side, and outside the right-handed circularly polarized light (or left-handed circularly polarized light). The light can be reflected to the viewer side.
  • Patent Document 8 discloses a method of stacking a plurality of cholesteric liquid crystal layers having different reflection bands and changing the helical pitch stepwise (Patent Document 8) And a method of continuously changing the spiral pitch of the cholesteric liquid crystal layer in the layer direction (see Patent Documents 9 to 12).
  • Patent Documents 10 and 11 disclose a method for obtaining a reflection band in a very wide range of 420 to 900 nm that substantially includes the visible light region (380 to 780 nm).
  • the present invention has been made in view of the above-described present situation, and makes use of the advantage of using a cholesteric liquid crystal layer as a half mirror layer, and a mirror display in which the color shift of the reflected color of the mirror display at the front viewing angle and the oblique viewing angle is suppressed. Is intended to provide.
  • the present inventors have shifted the reflection spectrum of the cholesteric liquid crystal layer to the short wavelength side at an oblique viewing angle, so that the cholesteric having a reflection band in the visible light region at the front viewing angle.
  • a cholesteric liquid crystal layer having a reflection band in the infrared light region at the front viewing angle is provided, and the present invention has been achieved.
  • one embodiment of the present invention includes a half mirror plate and a display panel disposed on the back side of the half mirror plate, and the half mirror plate includes a first visible light reflecting cholesteric liquid crystal layer and a red panel.
  • a mirror display having an external light reflecting cholesteric liquid crystal layer.
  • the mirror display of the present invention it is possible to suppress the color shift of the reflected color of the mirror display at the front viewing angle and the oblique viewing angle while taking advantage of the cholesteric liquid crystal layer as the half mirror layer.
  • FIG. 1 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 1.
  • FIG. 6 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 2.
  • FIG. 6 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 3.
  • FIG. 6 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 4.
  • FIG. 10 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 5.
  • FIG. 10 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Example 6.
  • FIG. 6 is a schematic cross-sectional view showing a configuration of a mirror display according to Comparative Example 1.
  • FIG. 10 is a schematic cross-sectional view showing a configuration of a mirror display according to Comparative Example 2.
  • FIG. It is a cross-sectional schematic diagram which shows the structure of the mirror display which concerns on the comparative example 3.
  • FIG. It is a cross-sectional schematic diagram which shows the structure of the mirror display which concerns on the comparative example 4.
  • 10 is a schematic cross-sectional view showing a configuration of a mirror display according to Comparative Example 5.
  • FIG. 10 is a schematic cross-sectional view showing a configuration of a mirror display according to Comparative Example 6.
  • FIG. 1 is a schematic cross-sectional view illustrating a configuration of a mirror display according to an embodiment.
  • the mirror display of this embodiment includes a half mirror plate 10, a liquid crystal panel (display panel) 20 a, and a backlight 30.
  • An observer of the mirror display visually recognizes the surface of the half mirror plate 10.
  • the upper direction in FIG. 1 is called the observer side
  • the lower direction in FIG. 1 is called the back side (the same applies to FIGS. 3 to 14).
  • the half mirror plate 10 includes a transparent substrate 11 and a cholesteric liquid crystal layer.
  • the transparent substrate 11 is preferably arranged closer to the viewer than the cholesteric liquid crystal layer. By providing the transparent substrate 11, scratch resistance and ease of maintenance can be improved.
  • the transparent substrate 11 is not particularly limited, and a resin substrate such as an acrylic plate or a glass substrate can be used. From the viewpoint of sufficiently functioning the half mirror plate 10 as a mirror, it is preferable not to arrange an antireflection film on the observer side of the half mirror plate 10. On the other hand, from the viewpoint of effectively using the display light emitted from the liquid crystal panel 20a, an antireflection film may be disposed on the liquid crystal panel 20a side of the half mirror plate 10.
  • the cholesteric liquid crystal layer includes a first visible light reflection cholesteric liquid crystal layer 13 and an infrared light reflection cholesteric liquid crystal layer 15.
  • the “visible light reflecting cholesteric liquid crystal layer” means a cholesteric liquid crystal layer having a reflection band at a front viewing angle in the visible light region (wavelength 380 to 780 nm).
  • the “infrared light reflecting cholesteric liquid crystal layer” means a cholesteric liquid crystal layer having a reflection band at the front viewing angle in the infrared light region, and at least a wavelength of 780 to 1400 nm corresponding to near infrared light. It is preferable to have a reflection band in the region.
  • the “reflection band at the front viewing angle” means a wavelength region in which a reflectance of half or more of the maximum reflectance is obtained under conditions of an incident angle of 5 degrees and an observation angle of 5 degrees.
  • the first visible light reflecting cholesteric liquid crystal layer 13 and the infrared light reflecting cholesteric liquid crystal layer 15 have the same rotation direction of circularly polarized light that is transmitted to each other.
  • the infrared light reflecting cholesteric liquid crystal layer 15 also reflects right circularly polarized light, It is preferable to transmit left circularly polarized light.
  • the first visible light reflecting cholesteric liquid crystal layer 13 and the infrared light reflecting cholesteric liquid crystal layer 15 may have a film form made of a cholesteric liquid crystal film attached to the transparent substrate 11, or on the transparent substrate 11. You may have the resin layer form which consists of the formed cholesteric liquid crystal resin layer.
  • An adhesive can be used for attaching the cholesteric liquid crystal film to the transparent substrate 11. That is, the first visible light reflecting cholesteric liquid crystal layer 13 or infrared light reflecting cholesteric liquid crystal layer 15 and the transparent substrate 11 may be in direct contact with each other, or the first visible light reflecting cholesteric liquid crystal layer 13 or infrared light.
  • a pressure-sensitive adhesive layer may be interposed between the reflective cholesteric liquid crystal layer 15 and the transparent substrate 11.
  • a pressure-sensitive adhesive layer adhesive layer
  • the resin layer form is preferable.
  • the first visible light reflecting cholesteric liquid crystal layer 13 is located on the transparent substrate 11 side, but the infrared light reflecting cholesteric liquid crystal layer 15 may be located on the transparent substrate 11 side. . Further, the first visible light reflecting cholesteric liquid crystal layer 13 and the infrared light reflecting cholesteric liquid crystal layer 15 may be in direct contact with each other, or the first visible light reflecting cholesteric liquid crystal layer 13 and the infrared light reflecting cholesteric liquid crystal layer 15. Between 15, other members such as a pressure-sensitive adhesive layer (adhesive layer) may be interposed.
  • a pressure-sensitive adhesive layer adheresive layer
  • the liquid crystal panel 20a includes, in order from the observer side, a first ⁇ / 4 plate 21, a first absorption linear polarizing plate (first linear polarizing plate) 22, a color filter substrate 23, a liquid crystal layer 24, and a TFT substrate 25.
  • the second absorption linearly polarizing plate (second linearly polarizing plate) 26 is disposed.
  • An antireflection film may be disposed on the surface of the first ⁇ / 4 plate 21 facing the half mirror plate 10, or on the surface of the half mirror plate 10 facing the first ⁇ / 4 plate 21.
  • An antireflection film may be disposed.
  • Both the first absorption linear polarizing plate 22 and the second absorption linear polarizing plate 26 may be replaced with a reflection polarizing plate.
  • the display light of the liquid crystal panel 20 a becomes circularly polarized light by passing through the first absorption type linearly polarizing plate 22 and the first ⁇ / 4 plate 21. In other words, in the display mode for displaying an image, the liquid crystal panel 20 a emits circularly polarized light toward the half mirror plate 10.
  • ⁇ / 4 plate means a birefringent body that gives a phase difference of a quarter of the wavelength ⁇ of visible light, but at least transmits light having a wavelength of 550 nm.
  • the optical member is not particularly limited as long as the optical member gives a phase difference of 120 to 160 nm.
  • the first ⁇ / 4 plate 21 may be bonded to the surface on the viewer side of the first absorption linear polarizing plate 22 using an adhesive, or the polarization in the first absorption linear polarizing plate 22. It may also serve as a child protective layer (PVA protective layer) and may be incorporated in the first absorption linear polarizing plate 22.
  • PVA protective layer child protective layer
  • a reflective polarizing plate (half mirror layer) is configured by combining the cholesteric liquid crystal layer in the half mirror plate 10 and the first ⁇ / 4 plate 21 in the liquid crystal panel 20a.
  • the reflective polarizing plate combining the cholesteric liquid crystal layer and the ⁇ / 4 plate converts the linearly polarized light transmitted through the first absorption linear polarizing plate 22 into the first ⁇ /
  • the four plates 21 convert the display light of the liquid crystal panel 20a to the viewer side by converting into left circularly polarized light (or right circularly polarized light) that can be transmitted through the cholesteric liquid crystal layer.
  • the reflective polarizing plate that combines the cholesteric liquid crystal layer and the ⁇ / 4 plate reflects the external light of right circularly polarized light (or left circularly polarized light) to the viewer side.
  • the linearly polarized light does not enter from the first absorption type linear polarizing plate 22 side, the display light of the liquid crystal panel 20a is not emitted to the viewer side.
  • the display mode and the mirror mode are switched according to the display state of the liquid crystal panel 20a.
  • the first absorption linear polarizing plate 22 is attached to the color filter substrate 23 via an adhesive
  • the second absorption linear polarizing plate 26 is attached to the TFT substrate 25 via an adhesive.
  • a reflective polarizing plate may be laminated on the backlight 30 side of the second absorption linear polarizing plate 26. Further, the second absorption linear polarizing plate 26 may be replaced with a reflective polarizing plate.
  • the reflective polarizing plate use may be made of a multilayer reflective polarizing plate (trade name: DBEF) manufactured by 3M Japan, or a reflective polarizing plate in which a ⁇ / 4 plate is attached to the observer side of the cholesteric liquid crystal film. it can. If the second absorption type linear polarizing plate 26 is replaced with a reflection type linear polarizing plate, the backlight light absorbed by the second absorption type linear polarizing plate 26 is reused. Can be raised.
  • the backlight 30 may be a direct type or an edge light type.
  • the light source used for the backlight 30 may be a light emitting diode (LED) 31 or a fluorescent tube.
  • the liquid crystal panel 20a is used as the display panel.
  • the type of the display panel applicable to the present invention is not particularly limited.
  • an organic electroluminescence display (OELD) is an organic electroluminescence display (OELD). It may be a plasma display.
  • OELD organic electroluminescence display
  • a so-called 3D display capable of observing a stereoscopic (3D) image may be used.
  • 3D-compatible display a natural depth feeling can be provided for the display as well as the mirror display, the design of the mirror display can be improved, and the mirror display can be used in various applications.
  • the stereoscopic image display method of the 3D-compatible display is not particularly limited, and any method can be used, but a naked-eye method that does not require glasses is more preferable. Examples of the naked-eye 3D display include a lenticular lens method and a parallax barrier method.
  • the mirror display of this embodiment has the following advantages.
  • (1) The cholesteric liquid crystal layer has a characteristic that the reflection band is shifted to the short wavelength side (blue shift) at an oblique viewing angle based on the Bragg reflection condition shown in the following formula.
  • ⁇ 0 nPcos ⁇ sin ⁇ 1 (sin ⁇ / n) ⁇
  • ⁇ 0 is the center wavelength of the reflection wavelength region
  • n is the average refractive index
  • P is the length of the helical pitch
  • ⁇ is the incident angle of the incident light to the cholesteric liquid crystal layer.
  • the cholesteric liquid crystal layer exhibits a phenomenon (blue shift) in which the reflection spectrum shifts to the short wavelength side at an oblique viewing angle.
  • FIG. 2 is a graph comparing the reflection spectra of the front viewing angle and the oblique viewing angle in the cholesteric liquid crystal layer.
  • the wavelength shift amount in the blue shift is larger on the long wavelength side, and a wavelength shift exceeding 200 nm occurs when the incident angle is large on the long wavelength side. For this reason, even in the cholesteric liquid crystal layer having a wide reflection band, a sufficient reflectance in the red region of visible light cannot be obtained, and the color of the reflected light deviates between the front viewing angle and the oblique viewing angle.
  • the direction of the slow axis of the first ⁇ / 4 plate 21 of the liquid crystal panel 20a with respect to the cholesteric liquid crystal layer of the half mirror plate 10 can be arbitrarily set. For this reason, it is not necessary to set a highly accurate axis between the half mirror plate 10 and the liquid crystal panel 20a, and the brightness of the display display light does not change even when a positional deviation occurs.
  • the multilayer reflective polarizing plate since the multilayer reflective polarizing plate has a size limit, there is a restriction in the transmission axis direction even in the case of a half mirror plate.
  • the transmission axis of the observer-side absorption polarizing plate of the liquid crystal panel is inclined with respect to each side of the half mirror plate, the area ratio of the product that can be cut out from the original fabric roll (efficiency of the original fabric roll) This leads to an increase in cost.
  • a multilayer reflective polarizing plate is manufactured by a roll-to-roll method in which coextrusion and transverse stretching are combined.
  • a feed block method or a multi-manifold method is used as a coextrusion method.
  • a material constituting the A layer in the multilayer reflective polarizing plate and a material constituting the B layer in the multilayer reflective polarizing plate are extruded in a feed block, Multi-layer using pliers.
  • the obtained elongate multilayer laminated body is extended
  • the material constituting the A layer for example, polyethylene naphthalate
  • the material constituting the B layer for example, copolyester of naphthalenedicarboxylic acid and terephthalic acid
  • the material constituting the B layer does not increase the refractive index in any direction.
  • the transmission axis of the multilayer reflective polarizing plate is parallel to the transport direction, that is, the long direction of the multilayer laminate
  • the transmission axis of the observer-side absorption polarizing plate of the liquid crystal panel is the short side direction.
  • the mirror display in which the long side size of the half mirror plate is equal to or smaller than the width size (TD length) of the multilayer laminate can be manufactured.
  • the multilayer reflection type polarizing plate has a problem that the appearance of the display light becomes dark when the polarized light is put on since the emitted light is linearly polarized light.
  • Patent Document 7 discloses an observer of a multilayer reflective polarizing plate so that the angle formed by the transmission axis of the multilayer reflective polarizing plate and the slow axis of the ⁇ / 4 plate is 45 °. A method of attaching a ⁇ / 4 plate to the side surface has been proposed.
  • Recent small- and medium-sized liquid crystal displays for smartphones, tablets, and in-vehicle applications may be designed so that the emitted light is circularly polarized so that the display can be seen even when wearing polarized sunglasses.
  • the absorption polarizing plate used in a liquid crystal display is a linear polarizing plate made of a polyvinyl alcohol (PVA) dyed stretched film polarizer and a triacetyl cellulose (TAC) protective layer, and the light emitted from the display is Linearly polarized light.
  • PVA polyvinyl alcohol
  • TAC triacetyl cellulose
  • the ⁇ / 4 plate is attached to the linearly polarizing plate so that the angle formed by the absorption axis of the linearly polarizing plate and the slow axis of the ⁇ / 4 plate is 45 °.
  • the above method includes a process of cutting or punching the linearly polarizing plate and the ⁇ / 4 plate into a predetermined shape and a process of bonding the ⁇ / 4 plate to the linearly polarizing plate, so that the number of processes is large.
  • Visible light reflective cholesteric liquid crystal films used in Examples and Comparative Examples were produced by carrying out the following steps (A1) to (A6).
  • A1 94.8 parts by weight of a polymerizable liquid crystal compound of the following chemical formula (1), 5.2 parts by weight of a chiral agent (“LC756” manufactured by BASF), and a photopolymerization initiator (“IRGACURE907” manufactured by BASF)
  • a polymerizable solution is obtained by dissolving 3.0 parts by weight of the mixture in cyclopentanone so as to have a solid concentration of 30% by weight.
  • the polymerizable solution is applied to a stretched PET (polyethylene terephthalate) film.
  • the applied polymerizable solution is baked at 100 ° C. for 2 minutes and dried.
  • A4 In an air atmosphere at 40 ° C., ultraviolet rays are irradiated from the stretched PET film side at an irradiation energy of 40 mW / cm 2 for 1.2 seconds.
  • A5 The temperature is raised to 90 ° C. at a rate of 3 ° C./second, and then heated for 20 seconds in an air atmosphere at 90 ° C.
  • A6 In a nitrogen atmosphere at 50 ° C., ultraviolet rays are irradiated from the stretched PET film side at an irradiation energy of 60 mW / cm 2 for 10 seconds.
  • the infrared light reflecting cholesteric liquid crystal film used in the examples was manufactured by performing the following steps (B1) to (B3).
  • (B1) 97.5 parts by weight of a polymerizable liquid crystal compound (manufactured by BASF, “LC242”), 2.5 parts by weight of a chiral agent (manufactured by BASF, “LC756”), and a thermal polymerization initiator (Wako Pure Chemical Industries, Ltd.)
  • a polymerizable solution is obtained by dissolving 1.0 part by weight of a mixture (manufactured by “V-65”) in cyclopentanone so as to have a solid concentration of 30% by weight.
  • (B2) The polymerizable solution is applied to the stretched PET film.
  • (B3) Heat at 100 ° C. for 10 minutes in a nitrogen gas atmosphere containing 0.5% by volume of oxygen.
  • the pressure-sensitive adhesive used in Examples and Comparative Examples was “PD-S1” manufactured by Panac Corporation.
  • a 5-inch full high-definition (FHD) liquid crystal module (manufactured by Sharp) is disassembled into a liquid crystal panel 20a and a backlight 30, and the liquid crystal panel 20a is placed on the first absorption type linear polarizing plate 22 located on the viewer side.
  • First ⁇ / 4 plate 21 (manufactured by Nippon Zeon Co., Ltd., “ZD film”) was attached. At this time, the angle between the transmission axis of the first absorption type linear polarizing plate 22 and the slow axis of the first ⁇ / 4 plate 21 was adjusted to 45 °.
  • Example 2 A mirror display having the configuration shown in FIG. 4 was produced.
  • FIG. 4 is a schematic cross-sectional view illustrating the configuration of the mirror display according to the second embodiment.
  • the visible light reflecting cholesteric liquid crystal resin layer 13 b was formed directly on the glass substrate 11.
  • an infrared light reflecting cholesteric liquid crystal film 15a with a stretched PET film was attached onto the visible light reflecting cholesteric liquid crystal resin layer 13b using an adhesive.
  • the half mirror plate 10b of Example 2 was completed by peeling a stretched PET film from the infrared light reflection cholesteric liquid crystal film 15a.
  • a mirror display of Example 2 was produced in the same manner as Example 1 except for the manufacturing process of the half mirror plate 10b described above.
  • FIG. 5 is a schematic cross-sectional view illustrating the configuration of the mirror display according to the third embodiment.
  • a reflective linear polarizing plate 27 manufactured by 3M Japan, “DBEF”
  • DBEF 3M Japan
  • FIG. 6 is a schematic cross-sectional view illustrating the configuration of the mirror display according to the fourth embodiment.
  • the second ⁇ / 4 plate 28 manufactured by Zeon Corporation, “ZD film”
  • stretched PET are used on the backlight 30 side of the second absorption linear polarizing plate 26 using an adhesive.
  • a second visible light reflecting cholesteric liquid crystal film 29 with a film was attached in order, and the stretched PET film was peeled from the second visible light reflecting cholesteric liquid crystal film 29.
  • the mirror display of Example 4 was produced through the same steps as in Example 1.
  • FIG. 8 is a schematic cross-sectional view illustrating the configuration of the mirror display according to the sixth embodiment.
  • a second ⁇ / 4 plate 28 manufactured by Nippon Zeon Co., Ltd., “ZD film”
  • ZD film a second visible light reflection with a stretched PET film
  • Example 6 A cholesteric liquid crystal film 29 was attached in order, and the stretched PET film was peeled off from the second visible light reflecting cholesteric liquid crystal film 29 to prepare a liquid crystal panel 20e. Except for the above, the mirror display of Example 6 was produced through the same steps as in Example 1.
  • FIG. 9 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Comparative Example 1.
  • a half-mirror plate 60a of Comparative Example 1 was prepared by attaching a reflective linearly polarizing plate 62 (manufactured by 3M Japan, “DBEF”) to the glass substrate 61 using an adhesive. Further, the 5-inch full high vision (FHD) liquid crystal module (manufactured by Sharp) used in Example 1 was used as it was without being disassembled.
  • DBEF reflective linearly polarizing plate
  • FHD full high vision
  • the first ⁇ / 4 plate 21 is provided in the liquid crystal panel 20a of the first embodiment, but nothing is pasted on the first absorption type linear polarizing plate 22 in the liquid crystal panel 70a of the first comparative example. It was not attached. Except for the above, the mirror display of Comparative Example 1 was produced through the same steps as in Example 1.
  • FIG. 10 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Comparative Example 2.
  • a visible light reflective cholesteric liquid crystal film 63a with a stretched PET film was attached to the glass substrate 61 using an adhesive. Thereafter, the stretched PET film was peeled from the visible light reflecting cholesteric liquid crystal film 63a.
  • the half mirror plate 60b of the comparative example 2 was produced by affixing (lambda) / 4 board 64 (made by Nippon Zeon Co., Ltd., "ZD film”) to the visible light reflection cholesteric liquid crystal film 63a using an adhesive. Except for the above, the mirror display of Comparative Example 2 was produced through the same steps as in Comparative Example 1.
  • FIG. 11 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Comparative Example 3.
  • a ⁇ / 4 plate 64 manufactured by Nippon Zeon Co., Ltd., “ZD film”
  • DBEF reflective linear polarizing plate 62
  • FIG. 12 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Comparative Example 4.
  • a visible light reflective cholesteric liquid crystal film 63a with a stretched PET film was attached to the glass substrate 61 using an adhesive.
  • the stretched PET film was peeled off from the visible reflective cholesteric liquid crystal film 63a to complete the half mirror plate 60d of Comparative Example 4.
  • a mirror display of Comparative Example 4 was produced in the same manner as in Example 1 except for the manufacturing process of the half mirror plate described above.
  • FIG. 14 is a schematic cross-sectional view illustrating a configuration of a mirror display according to Comparative Example 6.
  • the mirror display according to Comparative Example 6 includes a ⁇ / 4 plate-integrated circularly polarizing plate 73 as a countermeasure against polarized sunglasses.
  • the first ⁇ / 4 plate 21 and the first absorption linear polarizing plate 22 are provided independently, but in the liquid crystal panel 70b of Comparative Example 6, A ⁇ / 4 plate-integrated circularly polarizing plate 73, which is a laminate including the ⁇ / 4 plate 71 and the absorption linearly polarizing plate 72, was provided on the viewer side.
  • the mirror display of Comparative Example 6 was produced through the same steps as in Comparative Example 4.
  • the results of the evaluation test 1 are shown in Table 1. As shown in Table 1, the brightness of the mirror displays of Comparative Examples 1 to 3 was greatly changed by rotating the half mirror plate. On the other hand, in the mirror displays of Examples 1 to 6 and Comparative Examples 4 to 6, the luminance hardly changed even when the half mirror plate was rotated. From the results of Evaluation Test 1, it was found that the brightness of the mirror displays of Comparative Examples 1 to 3 was likely to change due to the misalignment between the half mirror plate and the liquid crystal panel.
  • One embodiment of the present invention includes a half mirror plate and a display panel disposed on the back side of the half mirror plate, the half mirror plate including a first visible light reflecting cholesteric liquid crystal layer and infrared light.
  • a mirror display having a reflective cholesteric liquid crystal layer.
  • the half mirror plate further includes a first pressure-sensitive adhesive layer that joins the first visible light reflection cholesteric liquid crystal layer and the infrared light reflection cholesteric liquid crystal layer.
  • the half mirror plate further includes a transparent substrate.
  • the half mirror plate further includes a second pressure-sensitive adhesive layer that joins the first visible light reflection cholesteric liquid crystal layer or the infrared light reflection cholesteric liquid crystal layer and the transparent substrate.
  • the first visible light reflecting cholesteric liquid crystal layer or the infrared light reflecting cholesteric liquid crystal layer is in direct contact with the transparent substrate.
  • the display panel includes a liquid crystal layer disposed on the back side of the first linear polarizing plate.
  • the display panel may further include (1) a reflective polarizing plate disposed on the back side of the liquid crystal layer, and (2) a second ⁇ disposed on the back side of the liquid crystal layer. / 4 plate and a second visible light reflecting cholesteric liquid crystal layer disposed on the back side of the second ⁇ / 4 plate, and (3) disposed on the back side of the liquid crystal layer. It may have a second linearly polarizing plate.
  • the display panel further includes (3-1) a second ⁇ / 4 plate disposed on the back side of the second linearly polarizing plate, and the second ⁇ / 4 plate. And a second visible light reflecting cholesteric liquid crystal layer disposed on the back side of the light source, and (3-2) a reflective polarizing plate disposed on the back side of the second linear polarizing plate. You may have.
  • it further includes a backlight disposed on the back side of the display panel.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un afficheur à miroir dont le décalage de couleurs des couleurs réfléchies à un angle de vision frontal et à un angle de vision oblique est supprimé, et qui profite de l'utilisation de couches de cristaux liquides cholestériques dans une couche demi-miroir. Cet afficheur à miroir est pourvu d'une plaque demi-miroir, et d'un panneau d'affichage disposé sur le côté surface arrière de la plaque demi-miroir. Ladite plaque demi-miroir comprend une première couche de cristaux liquides cholestériques réfléchissant la lumière visible, et une couche de cristaux liquides cholestériques réfléchissant la lumière infrarouge.
PCT/JP2017/003891 2016-02-10 2017-02-03 Afficheur à miroir WO2017138442A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016023912 2016-02-10
JP2016-023912 2016-02-10

Publications (1)

Publication Number Publication Date
WO2017138442A1 true WO2017138442A1 (fr) 2017-08-17

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PCT/JP2017/003891 WO2017138442A1 (fr) 2016-02-10 2017-02-03 Afficheur à miroir

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WO (1) WO2017138442A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017175581A1 (ja) * 2016-04-07 2019-02-21 日本化薬株式会社 光反射フィルム、ならびにこれを用いた光制御フィルムおよびミラーディスプレイ
JP7476073B2 (ja) 2020-10-12 2024-04-30 株式会社ジャパンディスプレイ 表示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004125885A (ja) * 2002-09-30 2004-04-22 Seiko Epson Corp 表示装置及びこれを備えた電子機器
JP2004519728A (ja) * 2001-03-16 2004-07-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ コレステリックカラーフィルタ
JP2004309618A (ja) * 2003-04-03 2004-11-04 Nitto Denko Corp 光学素子、液晶セル、照明装置および液晶表示装置
WO2015122479A1 (fr) * 2014-02-14 2015-08-20 富士フイルム株式会社 Film d'amélioration de luminosité, élément de feuille optique et dispositif d'affichage à cristaux liquides
WO2015186297A1 (fr) * 2014-06-03 2015-12-10 パナソニックＩｐマネジメント株式会社 Dispositif de miroir électronique
WO2016088708A1 (fr) * 2014-12-01 2016-06-09 富士フイルム株式会社 Miroir ayant une fonction d'affichage d'image

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004519728A (ja) * 2001-03-16 2004-07-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ コレステリックカラーフィルタ
JP2004125885A (ja) * 2002-09-30 2004-04-22 Seiko Epson Corp 表示装置及びこれを備えた電子機器
JP2004309618A (ja) * 2003-04-03 2004-11-04 Nitto Denko Corp 光学素子、液晶セル、照明装置および液晶表示装置
WO2015122479A1 (fr) * 2014-02-14 2015-08-20 富士フイルム株式会社 Film d'amélioration de luminosité, élément de feuille optique et dispositif d'affichage à cristaux liquides
WO2015186297A1 (fr) * 2014-06-03 2015-12-10 パナソニックＩｐマネジメント株式会社 Dispositif de miroir électronique
WO2016088708A1 (fr) * 2014-12-01 2016-06-09 富士フイルム株式会社 Miroir ayant une fonction d'affichage d'image

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017175581A1 (ja) * 2016-04-07 2019-02-21 日本化薬株式会社 光反射フィルム、ならびにこれを用いた光制御フィルムおよびミラーディスプレイ
JP7476073B2 (ja) 2020-10-12 2024-04-30 株式会社ジャパンディスプレイ 表示装置

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