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JP-7855869-B2 - Screen system

JP7855869B2JP 7855869 B2JP7855869 B2JP 7855869B2JP-7855869-B2

Inventors

  • 吉田 哲志

Assignees

  • ＴＯＰＰＡＮホールディングス株式会社

Dates

Publication Date
20260511
Application Date
20220210

Claims (6)

  1. A screen system including a dimming sheet and a dimming device comprising a control unit for controlling the application of voltage to the dimming sheet, The aforementioned dimming sheet is First transparent electrode layer, The second transparent electrode layer, A light-adjusting layer located between the first transparent electrode layer and the second transparent electrode layer, comprising a transparent polymer layer separating a plurality of voids, and a liquid crystal composition having positive dielectric anisotropy and held in the voids, A first orientation layer sandwiched between the first transparent electrode layer and the photochromic layer, The device comprises a second orientation layer sandwiched between the second transparent electrode layer and the photochromic layer, Each of the aforementioned first orientation layer and the aforementioned second orientation layer is a horizontally oriented film, The processing performed by the control unit includes: By controlling the voltage between the first transparent electrode layer and the second transparent electrode layer to a first voltage, the dimming sheet is brought into a first state that reflects visible light. This includes controlling the voltage between the first transparent electrode layer and the second transparent electrode layer to a third voltage greater than the first voltage, thereby putting the dimming sheet into a third state that transmits visible light. In the first state described above, the helical axis of the liquid crystal composition having a helical structure is inclined with respect to a direction perpendicular to the dimming sheet, The helical pitch P (μm), ordinary refractive index no, and extraordinary refractive index ne of the liquid crystal composition in the dimming sheet satisfy the following formula (1-1), and the peak median value λm of the reflection wavelength of the dimming sheet in the first state satisfies the following formula (1-2). 0.4≦P×(ne+2no)/3≦0.8 (1-1) λm=P×(ne+2no)/3...(1-2) The dimming device comprises two dimming sheets, a first dimming sheet and a second dimming sheet. The optical activity of the liquid crystal composition contained in the first dimming sheet and the optical activity of the liquid crystal composition contained in the second dimming sheet are different from each other. The first dimming sheet and the second dimming sheet are arranged so as to overlap in the thickness direction. The processing performed by the control unit includes setting each of the first dimming sheet and the second dimming sheet to the first state. The aforementioned screen system A screen comprising the first dimming sheet and the second dimming sheet, A first projection device that irradiates light toward the first dimming sheet, The system includes a second projection device that irradiates light onto the second dimming sheet from the opposite side of the screen from the first projection device. Screen system .
  2. The processing performed by the control unit further includes: The screen system according to claim 1, further comprising controlling the voltage between the first transparent electrode layer and the second transparent electrode layer to a second voltage greater than the first voltage and less than the third voltage, thereby putting the dimming sheet into a second state that scatters visible light.
  3. The screen system according to claim 1 or 2, wherein in the first state of the dimming sheet, the proportion of the dimming layer of regions in which liquid crystal molecules contained in the liquid crystal composition are horizontally oriented is 50% or more.
  4. The screen system according to any one of claims 1 to 3, wherein the proportion of the transparent polymer layer in the light-adjusting layer of the light-adjusting sheet is less than 50%.
  5. The refractive index np of the polymer material constituting the transparent polymer layer in the dimming sheet and the ordinary refractive index no of the liquid crystal composition satisfy the following formula (2): 0.98 ≤ np / no ≤ 1.02 ... (2) The screen system according to any one of claims 1 to 4.
  6. The processing performed by the control unit further includes: The screen system according to any one of claims 1 to 5, wherein each of the first dimming sheet and the second dimming sheet is put into a second state in which visible light is scattered by controlling the voltage between the first transparent electrode layer and the second transparent electrode layer to a second voltage that is greater than the first voltage and less than the third voltage, and each of the first dimming sheet and the second dimming sheet is put into the third state .

Description

This invention relates to a screen system . The dimming sheet comprises a dimming layer containing a liquid crystal composition and a pair of transparent electrode layers sandwiching the dimming layer. A driving voltage is applied between the pair of transparent electrode layers. Since the orientation of the liquid crystal molecules changes depending on whether or not a driving voltage is applied, it is possible to switch between a transmission state where light passes through the dimming layer and a scattering state where light is scattered by the dimming layer (see, for example, Patent Document 1). Japanese Patent Publication No. 2018-45135 A diagram showing the configuration of a dimming device in one embodiment.This figure shows the structure of the dimming sheet in the first state of the dimming device of the above embodiment.This figure shows the structure of the dimming sheet in the second state provided by the dimming device of the above embodiment.This figure shows the structure of the dimming sheet in the third state provided by the dimming device of the above embodiment.This figure shows a typical example of the relationship between the applied voltage and the transmittance of infrared light for a dimming sheet provided in the dimming device of the above embodiment.A diagram showing the usage configuration of a screen system to which the dimming device of the above embodiment is applied, the diagram showing the sheet unit in a first state.A diagram showing the usage of a screen system to which the dimming device of the above embodiment is applied, the diagram showing the sheet unit in the second state.A diagram showing the usage of a screen system to which the dimming device of the above embodiment is applied, the diagram showing the sheet unit in the third state.A diagram showing the usage configuration of a dimmable window to which the dimming device of the above embodiment is applied, the diagram showing the case when the sheet unit is in a first state.A diagram showing the reflective properties of the two dimmable sheets provided in the sheet unit of the embodiment. An embodiment of a dimming device and a dimming sheet will be described with reference to Figures 1 to 9. In the following description, visible light refers to light in the wavelength range of 360 nm to 800 nm. [Configuration of the dimmer] As shown in Figure 1, the dimming device 100 comprises a sheet unit 10 and a control unit 60. The sheet unit 10 comprises a first dimming sheet 11 and a second dimming sheet 12. The control unit 60 controls the application of voltage to the dimming sheets 11 and 12. The first dimming sheet 11 and the second dimming sheet 12 are arranged so as to overlap in the thickness direction. The first dimming sheet 11 and the second dimming sheet 12 may be in contact or separated. For example, the first dimming sheet 11 is attached to the surface of the transparent plate 110, and the second dimming sheet 12 is attached to the back surface of the transparent plate 110. The transparent panel 110 is formed from glass, resin, or the like. Examples of transparent panels 110 include window panes in various buildings such as houses, train stations, and airports, partitions installed in offices, and display windows in shops. Furthermore, the configuration is not limited to the above; the first dimming sheet 11 and the second dimming sheet 12 may be attached to separate transparent plates, or they may be laminated on one surface of a single transparent plate. [Configuration of the dimming sheet] The detailed configurations of the dimming sheets 11 and 12 will be explained with reference to Figures 2 to 5. In the following explanation, the first dimming sheet 11 will be used as an example. As shown in Figure 2, the dimming sheet 11 comprises a dimming layer 20, a pair of transparent electrode layers 31 and 32, a pair of transparent support layers 41 and 42, and a pair of orientation layers 51 and 52. The pair of transparent electrode layers 31 and 32 are the first transparent electrode layer 31 and the second transparent electrode layer 32; the pair of transparent support layers 41 and 42 are the first transparent support layer 41 and the second transparent support layer 42; and the pair of orientation layers are the first orientation layer 51 and the second orientation layer 52. The photochromic layer 20 is sandwiched between the first transparent electrode layer 31 and the second transparent electrode layer 32. A first orientation layer 51 is located between the photochromic layer 20 and the first transparent electrode layer 31, and the first orientation layer 51 is in contact with both the photochromic layer 20 and the first transparent electrode layer 31. A second orientation layer 52 is located between the photochromic layer 20 and the second transparent electrode layer 32, and the second orientation layer 52 is in contact with both the photochromic layer 20 and the second transparent electrode layer 32. The f