CN111684345A - Light control system - Google Patents
Light control system Download PDFInfo
- Publication number
- CN111684345A CN111684345A CN201980011896.4A CN201980011896A CN111684345A CN 111684345 A CN111684345 A CN 111684345A CN 201980011896 A CN201980011896 A CN 201980011896A CN 111684345 A CN111684345 A CN 111684345A
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- China
- Prior art keywords
- light
- wavelength band
- filter
- control system
- wavelength
- Prior art date
- Legal status (The legal status 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 status listed.)
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- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
- G02F1/133509—Filters, e.g. light shielding masks
-
- 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
- G02F1/133528—Polarisers
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Filters (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a light control system for suppressing the display quality of a display device from being reduced due to the reflection of ambient light. The light control system of the present invention is a light control system (5) for controlling light in a space in which a display device is disposed, and is provided with a display device and an ambient light supply unit (30), wherein the ambient light supply unit (30) supplies ambient light having a peak wavelength in a1 st wavelength band and a2 nd wavelength band to the display device, and the display device is provided with a reflection unit (Rf) that reflects the ambient light, and a1 st optical filter (20) that is disposed on the observation side of the reflection unit (Rf) and absorbs at least one of light components in the 1 st wavelength band and the 2 nd wavelength band.
Description
Technical Field
The present invention relates to a light control system that controls light in a space in which a display device is disposed.
Background
Conventionally, liquid crystal display panels provided with an optical layer that absorbs a specific wavelength in order to expand the color gamut are known (patent documents 1 to 3).
Documents of the prior art
Patent document
Patent document 1; japanese patent laid-open publication No. 2009-251511
Patent document 2; japanese patent laid-open publication No. 2011-221456
Disclosure of Invention
Problems to be solved by the invention
The liquid crystal display panels described in patent documents 1 to 3 do not consider the influence of ambient light such as illumination light and external light from a window on the visibility of an observer. For example, reflection at the surface of the liquid crystal display panel, reflection at a TFT (Thin Film Transistor) substrate deep in the liquid crystal display panel, both may exist. Reflection on the surface of the liquid crystal display panel can be suppressed by a member of the surface (surface treatment, low reflection treatment) or the like. However, for the low reflection processing, high cost becomes necessary. Further, for reflection that returns after advancing to the depth of the liquid crystal display panel, a countermeasure can be taken by including a pattern layer (mainly a black matrix) that absorbs light in the liquid crystal display panel. However, the absorption pattern of the pattern layer may cause a reduction in light use efficiency. Therefore, the method of providing a pattern layer or performing low reflection processing on a liquid crystal display panel as a reflection countermeasure for the liquid crystal display panel is currently lacking in versatility. Therefore, it is difficult to sufficiently eliminate the influence of reflection of ambient light, and when the liquid crystal display panel is irradiated with ambient light such as normal illumination light or external light from a window, a part of reflected light by the ambient light from the liquid crystal display panel may appear colored to a viewer. Therefore, the display quality of the liquid crystal display panel may be degraded.
The present invention has been made in view of the above circumstances, and provides a light control system capable of suppressing a reduction in display quality of a display device due to reflection of ambient light.
Means for solving the problems
One aspect of the present invention is a light control system for controlling light in a space in which a display device is disposed, the light control system including a display device and an ambient light providing unit that provides ambient light having peak wavelengths in a1 st wavelength band and a2 nd wavelength band to the display device, the display device including a reflection unit that reflects the ambient light, and a1 st optical filter that is disposed on an observation side of the reflection unit and absorbs at least one of light components in the 1 st wavelength band and the 2 nd wavelength band.
Effects of the invention
According to the present invention, it is possible to suppress the display quality of the display device from being degraded due to the reflection of the ambient light.
Drawings
Fig. 1 is a diagram showing a1 st configuration example of a light control system according to an embodiment.
Fig. 2 is a diagram showing a2 nd configuration example of the light control system.
Fig. 3 is a diagram showing another lighting fixture.
Fig. 4 is a sectional view showing an example of the structure of the liquid crystal display.
Fig. 5 is a diagram showing an outline of a light control system for a test.
Fig. 6 is a graph showing the transmission characteristics of the 1 st optical filter and the 2 nd optical filter in the test.
Fig. 7 is a conceptual diagram showing the characteristics of the 2 nd filter on the luminaire side and the characteristics of the 2 nd filter on the liquid crystal display side.
Detailed Description
Hereinafter, embodiments of the light control system according to the present invention will be described with reference to the drawings.
(embodiment 1)
Fig. 1 is a diagram showing a1 st configuration example of a light control system 5 according to an embodiment. A liquid crystal display 10 is disposed in a room 3A of a house 3 in which a light control system 5 is installed. A window 31 is provided on a wall surface of the room 3A so as to face the liquid crystal display 10. Therefore, the outside light passing through the window 31 may be directly incident on the screen of the liquid crystal display 10. In addition, an observer 7 who views the liquid crystal display 10 is present between the liquid crystal display 10 and the window 31.
The light control system 5 of the present embodiment includes a liquid crystal display 10 and an ambient light providing unit 30 that provides ambient light. The liquid crystal display 10 includes a1 st filter 20 on the display screen side of the liquid crystal display 10. The ambient light provider 30 includes a window 31 and a2 nd filter 40 attached to a surface of the window 31.
The outside light L1 entering the room 3A through the window 31 passes through the 2 nd filter 40 attached to the window 31, and becomes light having a peak (maximum wavelength) in a specific wavelength band (for example, 495nm or 595nm) (ambient light L2).
The 1 st optical filter 20 contains a1 st dye group having an absorption maximum wavelength at a specific wavelength (for example, 495nm or 595 nm). That is, the 1 st optical filter 20 absorbs light components in a specific wavelength band (for example, 495nm or 595nm) by the 1 st dye group. The 2 nd filter 40 contains the 2 nd dye group having the maximum absorption wavelength at a wavelength (e.g., 445nm, 550nm, 700nm) other than the specific wavelength (e.g., 495nm, 595 nm). That is, the 2 nd filter 40 absorbs light components in wavelength bands (e.g., 445nm, 550nm, 700nm) other than the specific wavelength bands (e.g., 495nm, 595nm) by the 2 nd dye group. The maximum absorption wavelength corresponding to a specific wavelength is not strictly limited to 1 specific wavelength (for example, 495nm or 595nm), and may be 1 wavelength included in a certain wavelength width (wavelength band). The dye group (for example, the 1 st dye group and the 2 nd dye group) includes 1 or more kinds of dyes and absorbs light components in 1 or more wavelength bands. The dye group may be formed such that each of the plurality of dyes absorbs light components in a plurality of wavelength bands, or 1 dye may simultaneously absorb light components in a plurality of wavelength bands.
The 495nm wavelength band may be a wavelength band having a predetermined width including 495nm (light blue wavelength band, for example, 480nm to 510 nm). The wavelength band of 595nm may be a wavelength band having a predetermined width (yellow wavelength band, for example, 580nm to 610nm) including 595 nm. The 445nm wavelength band may be a blue wavelength band (for example, 380nm to 480nm) having a predetermined width including 445 nm. The wavelength band of 550nm may be a green wavelength band (for example, 500nm to 580nm) having a predetermined width including 550 nm. The wavelength band of 700nm may be a red wavelength band (for example, 600nm to 780nm) having a predetermined width including 700 nm.
The 2 nd filter 40 may be formed by mixing a pigment into a resin. The 2 nd filter 40 may be formed by kneading a coloring matter into a hard plastic resin or film.
The 1 st optical filter 20 and the 2 nd optical filter 40 function as color correction filters for performing wavelength correction and color tone correction of light. The 1 st filter 20 may attenuate at least one or both of the light component of the wavelength band of 495nm and the light component of the wavelength band of 595 nm.
(embodiment 2)
Fig. 2 is a diagram showing a configuration example 2 of the light control system 5. In the room 3A of the house 3 where the light control system 5 is installed, the liquid crystal display 10 is disposed in the same manner as in configuration example 1. In fig. 2, the ambient light providing unit 30 includes a lighting fixture 35 (an example of a light source) and a2 nd filter 40. A lighting fixture 35 is mounted on the ceiling of the room 3A so as to illuminate the room 3A including the liquid crystal display 10. For example, the lighting fixture 35 is a ceiling lamp. The lighting fixture 35 is not limited to a ceiling lamp, and may be a wall-mounted lamp, a ceiling lamp, a table lamp, or the like. The light source of the lighting fixture may be a fluorescent lamp, an LED (light emitting diode), an incandescent lamp, or the like.
The 2 nd filter 40 is attached to the surface of a light diffusion cover 35z for diffusing light emitted from the lighting fixture 35. The optical characteristics of the 2 nd filter 40 may be the same as those of the 1 st configuration example. The illumination light emitted from the lighting fixture 35 into the room 3A passes through the 2 nd filter 40 attached to the light diffusing cover 35z, and becomes light (ambient light L3) having a peak in a specific wavelength band (for example, 495nm or 595 nm).
(other Lighting appliances)
Fig. 3 is a diagram showing another lighting fixture 35A. The configuration of the light control system 5 is substantially the same as that of configuration example 2. In the lighting fixture 35 of configuration example 2, the light emitted from the lighting fixture 35 passes through the 2 nd filter 40, and thus the light having a peak in a specific wavelength band (for example, 495nm or 595nm) is taken as the ambient light L3. In fig. 3, the ambient light providing unit 30 includes another lighting fixture 35A (an example of a light source) and does not include the 2 nd filter 40. Therefore, the illumination light irradiated from the other lighting fixture 35A into the room 3A becomes light having a peak in a specific wavelength band (for example, 495nm or 595nm) (ambient light L4) without passing through the 2 nd filter 40.
The other lighting device 35A may use, for example, an LED that emits light in a specific wavelength band (e.g., 495nm or 595nm) as a light source. The light source may be a combination of an LED that emits light having a peak at a wavelength of 495nm and an LED that emits light having a peak at a wavelength of 595 nm.
Fig. 4 is a sectional view showing an example of the structure of the liquid crystal display 10. The liquid crystal display 10 has a configuration including a liquid crystal display panel 11 and a backlight 18. A low reflection layer (low reflection treated layer subjected to low reflection treatment) 105 that diffusely reflects external light is provided on the surface of the liquid crystal display panel 11. The backlight 18 is illuminated from the back of the liquid crystal display panel 11. Note that the low reflection layer 105 may be omitted.
The liquid crystal display panel 11 has a structure in which the following are stacked: a liquid crystal cell 17; ITO (Indium Tin Oxide) transparent electrodes 15A, 15B; a TFT substrate 14; a color filter 16; glass substrates 13A, 13B; and polarizing plates 12A, 12B. The ITO transparent electrodes 15A and 15B are formed so as to face the liquid crystal cell 17 from both sides, and the liquid crystal is aligned in a predetermined direction by an applied voltage. The TFT substrate 14 drives on/off the voltage applied to the ITO transparent electrodes 15A, 15B. The color filter 16 allows light of a specific color (red (R), green (G), blue (B)) among the light passing through the liquid crystal cell 17 to pass through the cell unit. The glass substrates 13A and 13B protect the liquid crystal display panel 11. The polarizing plates 12A and 12B have polarization directions orthogonal to each other, and pass linearly polarized or circularly polarized light. In the case where the dye has a high polarizing function, the liquid crystal display 10 may not include the polarizing plates 12A and 12B.
The 1 st filter 20 may be interposed between the glass substrate 13B and the polarizing plate 12B as an adhesive of the polarizing plate 12B attached to the surface of the glass substrate 13. The binder may contain a dye that absorbs light components in a specific wavelength band (e.g., 495nm or 595 nm). The 1 st filter 20 may be provided on the observation side of the liquid crystal display panel 11 (closer to the observation side than the TFT substrate 14), or may be interposed between the low reflection layer 105 and the polarizing plate 12B as an adhesive of the low reflection layer 105 attached to the surface of the polarizing plate 12. The composition for the 1 st filter 20 is described later. The layer including the liquid crystal cell 17, the ITO transparent electrode 15B, and the like forms a reflection portion Rf that reflects the ambient light L2 to L4 incident inside the liquid crystal display panel 11. The reflective portion Rf may include the ITO transparent electrode 15A, TFT on the substrate 14.
Next, the adhesive used in the 1 st optical filter 20 and the 2 nd optical filter 40 will be described.
The 1 st optical filter 20 and the 2 nd optical filter 40 may be prepared by adding a pigment that absorbs a specific wavelength to an adhesive composition as a base material. The adhesive composition may also use a non-pigmented adhesive 108.
(specific examples of adhesive composition)
As the binder (binder composition), any suitable binder may be used. The adhesive preferably has transparency and optical isotropy. Specific examples of the adhesive include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, epoxy-based adhesives, and cellulose-based adhesives. Preferably a rubber-based adhesive or an acrylic adhesive.
The rubber polymer of the rubber adhesive (adhesive composition) is a polymer that exhibits rubber elasticity in a temperature range around room temperature. Preferable examples of the rubber polymer (a) include a styrene-based thermoplastic elastomer (a1), an isobutylene-based polymer (a2), and a combination thereof.
Examples of the styrene-based thermoplastic elastomer (a1) include styrene-based block copolymers such as styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene-styrene block copolymer (SEPS, hydrogenated product of SIS), styrene-ethylene-propylene block copolymer (SEP, hydrogenated product of styrene-isoprene block copolymer), styrene-isobutylene-styrene block copolymer (SIBS), and styrene-butadiene rubber (SBR). Among them, a styrene-ethylene-propylene-styrene block copolymer (SEPS, hydrogenated product of SIS), a styrene-ethylene-butylene-styrene block copolymer (SEBS), and a styrene-isobutylene-styrene block copolymer (SIBS) are preferable in that they have polystyrene blocks at both ends of the molecule and have high cohesive force as a polymer. As the styrene-based thermoplastic elastomer (a1), a commercially available product can be used. Specific examples of commercially available products include SEPTON manufactured by Coly, HYBRAR, Tuftec manufactured by Asahi Chemicals, and SIBSTAR manufactured by Kaneka.
The weight average molecular weight of the styrene-based thermoplastic elastomer (a1) is preferably about 5 to 50 ten thousand, more preferably about 5 to 30 ten thousand, and still more preferably about 5 to 25 ten thousand. The weight average molecular weight of the styrene-based thermoplastic elastomer (a1) is preferably in such a range that the cohesive force and viscoelasticity of the polymer can be both satisfied.
The styrene content in the styrene-based thermoplastic elastomer (a1) is preferably about 5 to 70 wt%, more preferably about 5 to 40 wt%, and still more preferably about 10 to 20 wt%. When the styrene content in the styrene-based thermoplastic elastomer (a1) is in such a range, the viscoelasticity due to the soft segment can be ensured while maintaining the cohesive force due to the styrene site.
The isobutylene polymer (a2) includes isobutylene as a constituent monomer, and preferably has a weight average molecular weight (Mw) of 50 ten thousand or more. The isobutylene polymer (a2) may be a homopolymer of isobutylene (polyisobutylene, PIB) or a copolymer of isobutylene as a main monomer (that is, a copolymer obtained by copolymerizing isobutylene in a proportion of more than 50 mol%). Examples of such copolymers include a copolymer of isobutylene and n-butene; a copolymer of isobutylene and isoprene (e.g., butyl rubbers such as ordinary butyl rubber, chlorinated butyl rubber, brominated butyl rubber, and partially crosslinked butyl rubber); sulfides thereof, modified products (for example, modified products obtained by a functional group such as a hydroxyl group, a carboxyl group, an amino group, or an epoxy group), and the like. Among them, Polyisobutylene (PIB) is preferable from the viewpoint of not containing a double bond in the main chain and being excellent in weather resistance. As the isobutylene polymer (A2), a commercially available product can be used. Specific examples of commercially available products include OPPANOL manufactured by BASF corporation.
The weight average molecular weight (Mw) of the isobutylene polymer (a2) is preferably 50 ten thousand or more, more preferably 60 ten thousand or more, and further preferably 70 ten thousand or more. The upper limit of the weight average molecular weight (Mw) is preferably 500 ten thousand or less, more preferably 300 ten thousand or less, and still more preferably 200 ten thousand or less. When the weight average molecular weight of the isobutylene polymer (a2) is 50 ten thousand or more, a pressure-sensitive adhesive composition having more excellent durability during high-temperature storage can be obtained.
The content of the rubber-based polymer (a) in the pressure-sensitive adhesive (pressure-sensitive adhesive composition) is preferably 30% by weight or more, more preferably 40% by weight or more, further preferably 50% by weight or more, and particularly preferably 60% by weight or more of the total solid content of the pressure-sensitive adhesive composition. The upper limit of the content of the rubber-based polymer is preferably 95% by weight or less, and more preferably 90% by weight or less.
In the rubber-based adhesive, the rubber-based polymer (a) described above may be used in combination with other rubber-based polymers. Specific examples of the other rubber-based polymer include butyl rubber (IIR), Butadiene Rubber (BR), acrylonitrile-butadiene rubber (NBR), EPR (binary ethylene-propylene rubber), EPT (ternary ethylene-propylene rubber), acrylic rubber, urethane rubber, polyurethane-based thermoplastic elastomer; a polyester-based thermoplastic elastomer; a thermoplastic elastomer such as a polymer blend of polypropylene and EPT (ternary ethylene-propylene rubber). The amount of the other rubber-based polymer is preferably about 10 parts by weight or less based on 100 parts by weight of the rubber-based polymer (a).
The acrylic polymer of the acrylic pressure-sensitive adhesive (pressure-sensitive adhesive composition) typically contains an alkyl (meth) acrylate as a main component, and may contain an aromatic ring-containing (meth) acrylate, an amide group-containing monomer, a carboxyl group-containing monomer and/or a hydroxyl group-containing monomer as a copolymerization component according to the purpose. In the present specification, "(meth) acrylate" means acrylate and/or methacrylate. Examples of the alkyl (meth) acrylate include alkyl (meth) acrylates in which a linear or branched alkyl group has 1 to 18 carbon atoms. The aromatic ring-containing (meth) acrylate is a compound having an aromatic ring structure in its structure and containing a (meth) acryloyl group. Examples of the aromatic ring include a benzene ring, a naphthalene ring, and a biphenyl ring. The aromatic ring-containing (meth) acrylate can satisfy durability (particularly durability against a transparent conductive layer), and can improve display unevenness caused by white spots in the peripheral portion. The amide group-containing monomer is a compound containing an amide group in its structure and containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. The carboxyl group-containing monomer is a compound having a structure containing a carboxyl group and also containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. The hydroxyl group-containing monomer is a compound having a structure containing a hydroxyl group and containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Details of the acrylic binder are described in, for example, Japanese patent laid-open publication No. 2015-199942, the description of which is incorporated herein by reference.
For example, the pressure-sensitive adhesive composition can be obtained by blending 0.3 parts of benzoyl peroxide (trade name of npper BMT manufactured by japan grease) and 1 part of an isocyanate-based crosslinking agent (trade name of Coronate L manufactured by tokoa) with 100 parts of the solid content of the acrylic polymer solution. The acrylic polymer solution can be prepared as follows. A monomer mixture containing 100 parts of butyl methacrylate, 0.01 part of 2-hydroxyethyl acrylate and 5 parts of acrylic acid may be charged into a reaction vessel equipped with a condenser tube, a nitrogen inlet tube, a thermometer and a stirring device. Further, 0.1 part of 2, 2' -azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the monomer mixture together with 100 parts of ethyl acetate, and nitrogen substitution was performed by introducing nitrogen gas while slowly stirring. Thereafter, the polymerization reaction was carried out for 8 hours while keeping the liquid temperature in the flask at about 55 ℃, thereby preparing a solution of an acrylic polymer having a weight average molecular weight (Mw) of 180 ten thousand and an Mw/Mn of 4.1 (solid content concentration 30 wt%).
(specific examples of the coloring matter)
The binder composition may contain a pigment. Specific examples of the coloring matter include dyes of anthraquinone type, triphenylmethane type, naphthoquinone type, thioindigo type, perinone type, perylene type, squaric acid type, cyanine type, porphyrin type, azaporphyrin type, phthalocyanine type, subphthalocyanine type, quinizarine (quinizarine) type, polymethine type, rhodamine type, oxonol (oxonol) type, quinone type, azo type, xanthene type, azomethine type, quinacridone type, dioxazine type, diketopyrrolopyrrole type, anthrapyridone type, isoindolinone type, indanone type, indigo type, thioindigo type, quinophthalone type, quinoline type, triphenylmethane type, and the like.
In 1 embodiment, as the coloring matter, anthraquinone-based, oxime-based, naphthoquinone-based, quinizarine-based, oxonol-based, azo-based, xanthene-based, or phthalocyanine-based dyes are used. When these dyes are used, a colored layer having an absorption maximum wavelength in a wavelength band region in the range of 440nm to 510nm can be formed.
In 1 embodiment, as the coloring matter, for example, an indigo-based, rhodamine-based, quinacridone-based or porphyrin-based dye is used as the coloring matter having a maximum absorption wavelength in the above range. When these dyes are used, a colored layer having an absorption maximum wavelength in a wavelength band region in the range of 560nm to 610nm can be formed.
As the coloring matter, a pigment may be used. Specific examples of the pigment include black pigments (carbon black, bone black, graphite, iron black, titanium black, etc.), azo pigments, phthalocyanine pigments, polycyclic pigments (quinacridone, perylene, perinone, isoindolinone, dioxazine, thioindigo, anthraquinone, quinophthalone, metal complex, diketopyrrolopyrrole, etc.), dye lake pigments, white/extender pigments (titanium oxide, zinc sulfide, clay, talc, barium sulfate, calcium carbonate, etc.), colored pigments (yellow lead, cadmium, chrome vermilion, nickel titanium, chrome titanium, yellow iron oxide, red iron, zinc chromate, red lead, ultramarine, prussian blue, cobalt blue, chrome green, chromium oxide, bismuth vanadate, etc.), luster pigments (pearl pigments, aluminum pigments, bronze pigments, etc.), fluorescent pigments (zinc sulfide, strontium sulfide, copper, chromium oxide, copper, etc.), and the like, Strontium aluminate, etc.), and the like.
The content ratio of the pigment may be set to any suitable ratio depending on the type of the pigment, the desired light absorption characteristics, and the like. The content of the pigment is, for example, 0.01 to 100 parts by weight, and more preferably 0.01 to 50 parts by weight, based on 100 parts by weight of the base material.
When a pigment is used as the coloring matter, the number average particle diameter of the pigment in the matrix is preferably 500nm or less, and more preferably 1nm to 100 nm. If the amount is within this range, a colored layer having a small haze value can be formed. The number average particle diameter of the pigment was measured and calculated by observing the cross section of the colored layer.
(combination of coloring matter having maximum absorption wavelength at 595nm)
For example, in the preparation of the adhesive composition, 0.25 parts of porphyrazine dye (product name PD-320 manufactured by Shanben chemical Co., Ltd.: having a maximum absorption wavelength at 595nm) was further added to 100 parts of the solid content of the acrylic polymer solution. By this adjustment, an adhesive having a maximum absorption wavelength at 595nm can be obtained.
(combination of other coloring matters having maximum absorption wavelength at 595nm)
For example, in the preparation of the pressure-sensitive adhesive composition, 0.25 parts of a porphyrin-based dye (product name PD-320 manufactured by Shanben chemical Co., Ltd.: having a maximum absorption wavelength at 595nm) may be further added to 100 parts of the solid content of the acrylic polymer solution. By this adjustment, an adhesive having a maximum absorption wavelength at 595nm can be obtained.
(combination of a dye having a maximum absorption wavelength at 495 nm)
For example, in the preparation of the adhesive composition, 0.25 parts of a cyanine dye (product name FDB-008 available from Shanda chemical Co., Ltd.: having a maximum absorption wavelength of 495 nm) was further added to 100 parts of the solid content of the acrylic polymer solution. By this adjustment, an adhesive having an absorption maximum wavelength at 495nm can be obtained.
In addition, a pigment having a maximum absorption wavelength at 495nm and a pigment having a maximum absorption wavelength at 595nm can be blended in 1 adhesive composition.
One of the adhesives forming the second filter 40 may be a pigment (FDB-004 manufactured by shanda chemical corporation) having a blue absorption maximum wavelength of 445nm (also referred to as a blue absorption pigment) blended in the adhesive composition. One of the binders for forming the second filter 40 may be a binder composition containing a pigment (HSR-002, manufactured by yada chemical corporation) having a maximum absorption wavelength of 550nm of green (also referred to as a green absorbing pigment) in the binder composition. One of the adhesives forming the second filter 40 may be a laminate of an adhesive composition containing a pigment (FDR-029 manufactured by shanda chemical corporation) having a red maximum absorption wavelength of 700nm (also referred to as a red absorption pigment) blended in the adhesive composition.
In addition, a pigment having a maximum absorption wavelength at 445nm, a pigment having a maximum absorption wavelength at 550nm, and a pigment having a maximum absorption wavelength at 700nm may be incorporated in 1 adhesive composition.
Next, the performance test of the 1 st optical filter 20 and the 2 nd optical filter 40 will be explained.
Fig. 5 is a diagram showing an outline of the test light control system 100 provided to examine the performance of the 1 st optical filter 20 and the 2 nd optical filter 40. The test light control system 100 includes: light source 101, 2 nd filter 40, reflector 130, 1 st filter 20, and low Reflection layer (ARC: Anti Reflection Coat) 105. The light source 101 and the 2 nd filter 40 are assumed to be on the ambient light provider 30 side. The reflective plate 130, the 1 st filter 20, and the low reflection layer 105 are assumed to be the liquid crystal display 10 side.
The light source 101 may be, for example, an incandescent bulb that emits light close to natural light, or the above-described lighting fixture 35 that emits illumination light. The 2 nd filter 40 is disposed between the light source 101 and the reflective plate 130. The 2 nd filter 40 may be a transparent film obtained by mixing and molding the 2 nd dye group that absorbs light components other than the wavelength bands of 495nm and 595 nm. That is, the light source 110 and the 2 nd filter 40 supply the ambient light having a peak in a specific wavelength band (for example, 495nm, 595nm) to the reflective plate 103.
In fig. 5, the 2 nd filter 40 is formed in a film shape as a pressure-sensitive adhesive layer obtained by laminating pressure-sensitive adhesives containing 2 pigments out of 3 pigments. The pressure-sensitive adhesive layer includes a layer of a dye that absorbs an optical component in a blue wavelength band (blue wavelength absorbing layer), and a layer of a dye that absorbs an optical component in a red wavelength band (red wavelength absorbing layer). The 2 nd filter 40 may have 2 layers each of a blue wavelength absorbing layer and a red wavelength absorbing layer, for a total of 4 layers. The thickness of the wavelength absorption layer of each color is preferably about 3 to 30 μm. In the 2 nd filter 40, the order of stacking the 2 blue wavelength absorbing layers and the 2 red wavelength absorbing layers is arbitrary. In addition, the 4 layers are all adhesives of the same material, and therefore no reflection occurs at the interface between the layers.
One of the binders for forming the 2 nd filter 40 may be a binder composition in which a blue absorbing dye is blended. The other binder may be one obtained by blending a green absorbing pigment in the above binder composition.
The 2 nd filter 40 had a 4-layer structure in which a 10 μm adhesive layer containing a blue absorbing dye and a 20 μm adhesive layer containing a green absorbing dye were stacked in 2 layers, respectively, and had a thickness of 60 μm. The 2 nd filter 40 may further include a binder in which a red absorbing pigment is blended in the binder composition.
The reflective plate 130 is a plate material having a flat surface and reflecting incident light without causing diffused reflection. The reflective plate 130 is assumed to be the liquid crystal cell 17, the ITO transparent electrode 15A, the substrate 14 of 15B, TFT, and the like, which are the reflective portion Rf inside the liquid crystal display panel 11.
The 1 st optical filter 20 to be tested and the low Reflection layer (ARC) 105 provided through the 1 st optical filter 20 are provided on the surface of the Reflection plate 130. Here, the 1 st optical filter 20 may be a binder in which the 1 st dye group that absorbs light in a wavelength band of 495nm and light in a wavelength band of 595nm is mixed. The 1 st dye group can absorb the optical component in the 495nm wavelength band and the optical component in the 595nm wavelength band by 1 dye, and can also absorb the optical component in the 495nm wavelength band and the optical component in the 595nm wavelength band by 2 dyes. The low reflection layer 105 may be a transparent film having a large haze value indicating a ratio of diffuse transmittance such that incident light is diffusely reflected. The low reflection layer 105 may be bonded to the reflection plate 130 with the 1 st filter 20 as an adhesive interposed therebetween. The haze value of the binder may be small because it is optical, and may be smaller than the haze value of the low reflection layer 105.
In order to compare the performance of the first filter 20 with that of the second filter 1, a low reflection layer 105 was provided on the surface of the reflection plate 130 with a pigment-free adhesive 108 interposed therebetween. The non-colored adhesive 108 is an adhesive that does not contain the 1 st pigment group that absorbs light of a specific wavelength (for example, 495nm or 595 nm).
In the light control system 100 for test, when the illumination light emitted from the light source 101 passes through the 2 nd filter 40, light components other than the wavelength band of 495nm (a wavelength band of substantially bluish color between blue and green) and the wavelength band of 595nm (a wavelength band of substantially yellow color between green and red), that is, light components of the blue wavelength band, the green wavelength band, and the red wavelength band are absorbed.
The light having the light components of the wavelength bands of 495nm and 595nm transmitted through the 2 nd filter 40 enters the low reflection layer 105, and a part of the light is scattered and reflected to enter the 1 st filter 20. As for the light having the light components of the wavelength bands of 495nm and 595nm incident to the 1 st filter 20, the light is absorbed in a large amount by the 1 st filter 20 absorbing the light of the wavelength bands of 495nm and 595 nm.
The residual light not absorbed by the 1 st filter 20 further enters the reflection plate 130 in, for example, a substantially vertical direction, and is reflected by the reflection plate 130. The reflected light further enters the 1 st filter 20, and light components in the wavelength band of 495nm and the wavelength band of 595nm are absorbed again by the 1 st filter 20. Therefore, the reflected light that has passed through the 1 st filter 20 is substantially absorbed and disappears. Therefore, when the observer 7 is positioned between the light source 101 and the reflection plate 130, the light (corresponding to the ambient light L2 to L4) emitted from the light source 101 and reflected basically cannot reach the eyes of the observer 7.
That is, the test light control system 100 simulating the light control system 5 can suppress the light emitted from the light source 101 from reaching the observer 7. Therefore, the light control system 5 can suppress the supplied ambient light L2 to L4 from reaching the observer 7 by the light reflected by the liquid crystal display 10 including the reflection portion Rf.
It is assumed that the liquid crystal cell 17 and the transparent electrode 15B as the reflective plate 130 are included as members in the liquid crystal display panel 11. In this case, the 1 st filter 20 attenuates light components in the wavelength bands of 495nm and 595nm with respect to display light from the backlight 18 passing through the liquid crystal cell 17. Therefore, the color purity of blue, green, and red (primary colors) increases, the color gamut expands, and the color reproducibility increases. This can improve the display quality of each color.
On the other hand, in the surface of the reflection plate 130 as the comparative example in which the low reflection layer 105 was provided with the non-pigmented adhesive agent 108 therebetween, the light having the light components of the wavelength bands of 495nm and 595nm transmitted through the 2 nd filter 40 was incident on the low reflection layer 105, and a part of the light was scattered and incident on the non-pigmented adhesive agent 108. Since the non-dye binder 108 does not contain a dye, it does not absorb light having light components of 495nm wavelength band and 595nm wavelength band. The light having the light components of the wavelength band of 495nm and the wavelength band of 595nm, which remains in an unabsorbed state, is reflected by the reflection plate 130, and passes through the non-pigmented adhesive agent 108 and the low reflection layer 105 again. Therefore, when the observer 7 is positioned between the light source 101 and the reflection plate 130, the light having the light components of the wavelength bands of 495nm and 595nm out of the light (corresponding to the ambient light L2 to L4) emitted from the light source 101 and reflected can reach the eyes of the observer 7. Due to this light, the reflection plate 130 looks colored to the eyes of the observer 7, and visibility of the display by the liquid crystal display 10 is reduced.
It is assumed that the liquid crystal cell 17 and the transparent electrode 15B as the reflective plate 130 are included as members in the liquid crystal display panel 11. In this case, since the 1 st optical filter 20 does not attenuate the light components in the wavelength bands of 495nm and 595nm even for the display light from the backlight 18 passing through the liquid crystal cell 17, the color purity of blue, green, and red (primary colors) is reduced, the color gamut is narrowed, and the color reproducibility is reduced. Therefore, the display quality of each color is degraded.
The following are conceivable as the results of the test using the test light control system 100.
That is, when the non-dye adhesive 108 is provided on the surface of the reflection plate 130, the light components having the wavelength bands of 495nm and 595nm are not absorbed. Therefore, the light reflected by the reflection plate 130 reaches the eyes of the observer 7 in a large amount, and thus the color gamut becomes narrow. It is understood that the color reproducibility of the liquid crystal display panel 11 is thus reduced.
On the other hand, when the 1 st optical filter 20 is provided on the surface of the reflection plate 130, the light having the light components of the wavelength bands of 495nm and 595nm is absorbed. Therefore, the light reflected by the reflection plate 130 hardly reaches the eyes of the observer 7, and thus the color gamut is enlarged. It is understood that the color reproducibility of the liquid crystal display panel 11 is thus improved.
Fig. 6 is a graph showing the transmission characteristics of the 1 st optical filter 20 and the 2 nd optical filter 40 obtained as a result of the experiment. In the graph g2 showing the transmission characteristics of the 2 nd filter 40, the transmittances of the light component in the wavelength band of 495nm and the light component in the wavelength band of 595nm are high. Further, the transmittance of light having a red wavelength band is also high. On the other hand, in the graph g1 showing the transmission characteristics of the 1 st filter 20, the transmittance of light components other than the wavelength band of 495nm and the wavelength band of 595nm is high.
As shown in fig. 6, the 1 st filter 20 attenuates light components having low correlation with color gamut and color tone. For example, the 1 st filter 20 attenuates a light component of light blue (a light component of a wavelength band of 495 nm). The 1 st filter 20 attenuates a yellow light component (a light component in a wavelength band of 595 nm). Also, with respect to light emitted from the liquid crystal display panel 11, the blue component, the green component, and the red component in the 1 st filter 20 can be transmitted without being attenuated. Therefore, the light control system 5 is provided with the 1 st filter 20, and can sharpen the display image while suppressing reflection of the ambient light L2 to L4.
The 2 nd filter 40 attenuates light components that are not attenuated by the 1 st filter 20. For example, the 2 nd filter 40 attenuates light components of blue, green, and red. Thus, in the light control system 5, since almost all of the ambient light L2 to L4 passing through the 2 nd filter 40 is attenuated by the 1 st filter 20 by the combination of the 1 st filter 20 and the 2 nd filter 40, reflection of the ambient light L2 to L4 at the 1 st filter 20 hardly occurs. Therefore, the reflected light of the ambient light L2 to L4 hardly reaches the observer 7, and the light control system 5 can suppress a reduction in visibility of the display image displayed on the liquid crystal display 10.
Fig. 7 is a conceptual diagram showing the characteristics of the 2 nd filter on the side of the lighting fixture 35 and the characteristics of the 2 nd filter on the side of the liquid crystal display in the light control system 5.
As shown in graph sp2, the 2 nd filter 40 absorbs light components other than the wavelength band of 495nm and the wavelength band of 595 nm. Therefore, the ambient light L3 becomes light having light components in the wavelength bands of 495nm and 595nm and irradiates the liquid crystal display 10.
As shown in the graph sp1, the 1 st filter 20 absorbs light components of the wavelength band of 495nm and the wavelength band of 595 nm. Therefore, the light emitted from the liquid crystal display 10 through the 1 st filter 20 is directed to the observer 7 as light in the blue wavelength band, the green wavelength band, and the red wavelength band. Further, the 1 st optical filter 20 absorbs light components of the wavelength band of 495nm and the wavelength band of 595nm as ambient light. Therefore, the ambient light L3 is not reflected by the 1 st filter 20, and the ambient light L3 does not reach the observer 7 who observes the liquid crystal display 10 in the form of reflected light.
Therefore, when the liquid crystal display 10 does not emit display light for displaying an image (for example, when black is displayed), the ambient light L3 from the lighting fixture 35 is shielded by the 1 st filter 20 in the liquid crystal display 10, and thus becomes infinitely close to black. That is, the color reproducibility of black of the liquid crystal display 10 can be improved.
When the liquid crystal display 10 emits display light for displaying an image (for example, when displaying a color other than black), the liquid crystal display 10 attenuates the light components in the 495nm wavelength band and the 595nm wavelength band by the 1 st optical filter 20, thereby increasing the color purity of blue, green, and red, widening the color gamut, and reproducing a vivid image. That is, the color reproducibility of the liquid crystal display 10 other than black can be improved.
Next, a description will be given of a mode of a combination of the 1 st dye group contained in the 1 st filter and the 2 nd dye group contained in the 2 nd filter, and characteristics of a liquid crystal display obtained by the mode. The liquid crystal display of each mode has a different structure from that of the liquid crystal display of the 1 st filter and the liquid crystal display of the 2 nd filter, but the structures other than the pigments are the same.
The characteristics of the liquid crystal display may include, for example, reflectance, hue x, hue y, Δ xy, and brightness. The reflectance may represent the reflectance of the liquid crystal display, i.e., the proportion of ambient light emitted from the liquid crystal display relative to ambient light incident on the liquid crystal display. The hue X is the value of X in the XYZ color system. The hue Y is a value of Y in the XYZ color system. Δ xy is the distance between the coordinates of the hue x, y and the coordinates of the white point of the standard illuminant D65 { (x, y) { (0.3127, 0.3290) }. The luminance is the luminance of the liquid crystal display, i.e., the luminance of light emitted from the liquid crystal display.
Here, the reflectance, Δ xy, and brightness were evaluated as example 1, and comparative examples 1 and 2, using each pattern of the combination of the 1 st dye group and the 2 nd dye group. In comparative example 2, the reflectance and Δ xy were not performed.
< example 1>
In example 1, the 1 st pigment group contained a pigment having a maximum absorption wavelength at a wavelength of 495nm (trade name FDB-007 manufactured by Shanda chemical Co., Ltd.) and a pigment having a maximum absorption wavelength at a wavelength of 595nm (trade name FDG-007 manufactured by Shanda chemical Co., Ltd.). The 2 nd pigment group contains a pigment having a maximum absorption wavelength at a wavelength of 445nm (trade name FDB-004 manufactured by Shanda chemical Co., Ltd.), a pigment having a maximum absorption wavelength at a wavelength of 550nm (trade name HSR-002 manufactured by Shanda chemical Co., Ltd.), and a pigment having a maximum absorption wavelength at a wavelength of 700nm (trade name FDR-029 manufactured by Shanda chemical Co., Ltd.).
In example 1, the reflectance was 8.24%. The hue x is 0.3046. The color y is 0.3344. Δ xy is 0.010. The brightness was 60%. Here, the luminance is a relative value represented by taking the luminance when the 1 st dye group (absorbance at 495 or 595nm) is not applied to the liquid crystal display 10 as 100.
< comparative example 1>
In comparative example 1, the 1 st pigment group contained a pigment having a maximum absorption wavelength at a wavelength of 495nm (trade name FDB-007 manufactured by Shanda chemical Co., Ltd.) and a pigment having a maximum absorption wavelength at a wavelength of 595nm (trade name FDG-007 manufactured by Shanda chemical Co., Ltd.). That is, the 1 st dye group was the same as in example 1. On the other hand, the No. 2 dye group is not present. That is, the 2 nd filter does not contain the 2 nd dye group.
In comparative example 1, the reflectance was 10.51%. The hue x is 0.3127. The color y is 0.3023. Δ xy is 0.027. The brightness was 60%.
< comparative example 2>
In comparative example 2, the 1 st pigment group contained a pigment having a maximum absorption wavelength at a wavelength of 495nm (trade name FDB-007 manufactured by Shanda chemical Co., Ltd.) and a pigment having a maximum absorption wavelength at a wavelength of 595nm (trade name FDG-007 manufactured by Shanda chemical Co., Ltd.). The 1 st dye group includes a dye having a maximum absorption wavelength at a wavelength of 445nm (trade name FDB-004 manufactured by Shanda chemical Co., Ltd.), a dye having a maximum absorption wavelength at a wavelength of 550nm (trade name HSR-002 manufactured by Shanda chemical Co., Ltd.), and a dye having a maximum absorption wavelength at a wavelength of 700nm (trade name FDR-029 manufactured by Shanda chemical Co., Ltd.). On the other hand, the No. 2 dye group is not present. That is, the 2 nd filter does not contain the 2 nd dye group.
In comparative example 2, the luminance was 20%.
Table 1 summarizes the results of the evaluation of the reflectance, Δ xy, and luminance of example 1, comparative example 1, and comparative example 2.
[ Table 1]
| Example 1 | Comparative example 1 | Comparative example 2 | |
| Reflectivity of light | 8.24％ | 10.51％ | - |
| Δxy | 0.010 | 0.027 | - |
| Brightness of light | 60％ | 60％ | 20％ |
Comparing example 1 with comparative example 1, the reflectance of example 1 is smaller than that of comparative example 1. Therefore, in embodiment 1, the reflection of the ambient light L2 to L4 on the liquid crystal display 10 is small, and the amount of light reaching the observer 7 is small. Therefore, the light control system 5 can suppress the image displayed by the liquid crystal display 10 from appearing bluish or yellowish due to the reflection of the ambient light L2 to L4. In addition, Δ xy of example 1 is smaller than Δ xy of comparative example 1. Therefore, in embodiment 1, the light control system 5 can display white by reducing the distance from the white point serving as the reference while supplying the ambient light L2 to L4 to the liquid crystal display 10, and can suppress the influence of the ambient light L2 to L4 on the color reproducibility.
Example 1, comparative example 1 and comparative example 2 were compared, and the luminance of comparative example 2 was lower than that of example 1 and comparative example 1. This is because in comparative example 2, the dye absorbing the light component is added to the binder or the like more than in example 1 and comparative example 1, and therefore the light component absorbed is more. Further, comparing example 1 with comparative example 1, it can be understood that the luminance of the liquid crystal display 10 is not affected regardless of whether the 2 nd filter contains the 2 nd dye group. That is, the light intensity of the light emitted from the liquid crystal cell 17 does not decrease regardless of whether the 2 nd filter contains the 2 nd dye group. Therefore, the light control system 5 can increase the color gamut and improve the color reproducibility while maintaining the luminance of the liquid crystal display 10 by including the 2 nd dye group in the 2 nd filter 40.
In this manner, the light control system 5 of the present embodiment attenuates almost all of the light components of the ambient light L2 to L4 by the 1 st optical filter 20 and the 2 nd optical filter 40. Accordingly, a display image is visualized by display light emitted from the liquid crystal cell 17, which reaches the eyes of the observer 7. Therefore, for example, the deterioration of visibility of the display image due to the ambient light L2 to L4 incident on the liquid crystal display 10 provided in the room 3A can be suppressed.
Further, display devices using an OLED (Organic LED), a quantum dot, a micro LED, and the like have a wide color gamut and a clear image quality, but the cost of the display device is high. On the other hand, by providing the 1 st filter 20 and the 2 nd filter, the color gamut of the light control system 5 is wide, and the image quality of the display image can be made clear. In addition, the light control system 5 can reduce the cost required for the liquid crystal display 10 as a display device, and can easily install the liquid crystal display 10.
Further, the 1 st filter 20, which is an adhesive layer for bonding the polarizing plate 12B on the observation side of the liquid crystal display 10 (closer to the observation side than the TFT substrate 14), contains the 1 st dye group, whereby the color gamut can be expanded. However, when the light components of the ambient light L2 to L4 supplied from the ambient light supply side are not processed, the ambient light L2 to L4 are reflected by the reflection portion Rf of the panel substrate or the like to have visibility, and the reproducibility of color is lowered. Therefore, the light control system 5 is provided with the 2 nd filter 40 including the 2 nd dye group as a member for absorbing a specific wavelength on the ambient light supply side. That is, the light control system 5 includes an ambient light wavelength correction filter (for example, the 2 nd filter 40) and a color correction filter for a display device (for example, the 1 st filter 20). Thus, assuming a space in which the ambient light providing unit 30 side and the liquid crystal display 10 side are combined, the light control system 5 can provide a display image with good visibility and excellent hue to the observer 7.
As described above, the light control system 5 of the present embodiment controls the light of the room 3A of the house 3 in which the liquid crystal display 10 is installed. The light control system 5 includes a liquid crystal display 10 and an ambient light providing unit 30. The ambient light providing unit 30 provides the liquid crystal display 10 with the ambient lights L2 to L4 having peak wavelengths in the 1 st wavelength band and the 2 nd wavelength band. The liquid crystal display 10 includes: a reflection unit Rf for reflecting the ambient light L2 to L4 incident therein; and a1 st optical filter 20 disposed on the observation side of the reflection portion Rf and absorbing at least one of the light components in the 1 st wavelength band and the 2 nd wavelength band. The liquid crystal display 10 is an example of a display device. As an example of the configuration. An indoor space is an example of a space.
In the light control system 5, the 1 st optical filter 20 absorbs light components in the 1 st wavelength band and the 2 nd wavelength band (for example, a wavelength band in which color reproducibility is reduced) of both the ambient light L2 to L4 present on the observation side of the 1 st optical filter 20 and the light emitted from the liquid crystal cell 17 on the back side of the 1 st optical filter 20. Thus, the light control system 5 can suppress a decrease in the reproducibility of the color of light emitted from the liquid crystal cell 17 and also suppress a decrease in visibility due to the reflection of the ambient light L2 to L4 at the reflection portion Rf (for example, the liquid crystal cell 17 and the ITO transparent electrode 15B). In addition, since the ambient light L2 to L4 entering the liquid crystal display 10 has peak wavelengths in the 1 st wavelength band and the 2 nd wavelength band, the reflection of the ambient light L2 to L4 at the reflection portion Rf can be infinitely close to 0 value in consideration of the absorption of the light components in the 1 st wavelength band and the 2 nd wavelength band at the 1 st optical filter 20. Therefore, for example, when the liquid crystal cell 17 does not emit light, the light intensities in the 1 st wavelength band and the 2 nd wavelength band are small, and the ambient light L2 to L4 contain substantially no light components other than the 1 st wavelength band and the 2 nd wavelength band. Therefore, the display quality of black displayed by the liquid crystal display 10 can be improved. Similarly, for example, when the liquid crystal cell 17 emits light, the light intensities in the 1 st wavelength band and the 2 nd wavelength band from the liquid crystal cell 17 are also absorbed by the 1 st optical filter 20, and the ambient light L2 to L4 also contain substantially no light components other than the 1 st wavelength band and the 2 nd wavelength band, so that the display quality of each color can be improved. In this way, the deterioration of the display quality of the liquid crystal display 10 due to the reflection of the ambient light L2 to L4 can be suppressed. The ambient lights L2 to L4 include lights having circular polarization, but the light control system 5 can shield the ambient lights L2 to L4 without providing a circular polarizing plate to shield the lights having circular polarization. Therefore, the light control system 5 can omit a polarizing plate, reduce the number of components, and reduce the cost.
The 1 st wavelength band may be a wavelength band between the red light component and the green light component (for example, a wavelength band of 595 nm). The 2 nd wavelength band may be a wavelength band between the light component of blue and the light component of green (for example, a wavelength band of 495 nm).
Thus, when the observer 7 observes the display by the liquid crystal display 10, the 2 nd filter 40 can absorb at least one of the light component near 495nm (substantially bluish component), for example, and the light component near 595nm (substantially yellow component), for example, which are factors that reduce visibility. Thus, the light control system 5 can clearly reproduce each color component of blue, green, and red, and can improve the visibility of the display by the liquid crystal display 10 of the observer 7.
The ambient light provider 30 may include a2 nd filter 40 that absorbs light components of wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band.
Thus, with the light control system 5, the 2 nd filter 40 absorbs light components of wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band, and therefore, it is possible to supply the ambient light L2, L3 having peak wavelengths in the 1 st wavelength band and the 2 nd wavelength band to the liquid crystal display 10.
The ambient light providing unit 30 includes a lighting fixture 35. The 2 nd filter 40 may be disposed between the lighting fixture 35 and the liquid crystal display 10. The lighting fixture 35 is an example of the 1 st light source.
Thus, the light control system 5 can actively emit the ambient light L3, and color reproducibility can be improved even in the room 3A with little outside light. The ambient light providing unit 30 may use a general light source to project the ambient light L3 having a specific wavelength characteristic. Therefore, the ambient light providing unit 30 can be configured using the inexpensive lighting fixture 35.
The light control system 5 may include a lighting fixture 35A that provides ambient light L4 having peak wavelengths in the 1 st wavelength band and the 2 nd wavelength band. The lighting fixture 35A is an example of the 2 nd light source.
Thereby, the light control system 5 can actively emit the ambient light L4. Further, since the lighting fixture 35A itself emits the ambient light L4 having the peak wavelengths in the 1 st wavelength band and the 2 nd wavelength band, the 2 nd filter 40 that attenuates the light components in the 3 rd wavelength band (for example, the blue, green, and red wavelength bands) other than the 1 st wavelength band and the 2 nd wavelength band is not necessary.
The 1 st filter 20 may have a1 st dye that absorbs at least one of light components of the 1 st wavelength band and the 2 nd wavelength band. The 1 st dye may be, for example, the 1 st dye group.
Thereby, the light control system 5 can easily set the 1 st filter 20 capable of absorbing at least one of the light components of the 1 st wavelength band and the 2 nd wavelength band.
The 2 nd filter 40 may have a2 nd dye that absorbs light components of wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band. The 2 nd dye may be, for example, the 2 nd dye group.
Thereby, the light control system 5 can easily set the 2 nd filter 40 capable of absorbing light components of wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band.
In addition, the liquid crystal display 10 may have the low reflection layer 105 on the closer side to the observation side than the 1 st filter 20. The low reflection layer 105 is an example of a low reflection processed layer subjected to low reflection processing.
Thus, the light control system 5 can suppress a decrease in color reproducibility due to the reflection of the ambient lights L2 to L4 by the reflection portion Rf, and can suppress a decrease in color reproducibility due to the reflection of the ambient lights L2 to L4 by the surface of the liquid crystal display 10. Therefore, the light control system 5 can further improve the visibility of the display image by the liquid crystal display 10.
In addition, the reflective portion Rf may include the liquid crystal cell 17 or the ITO transparent electrode 15B. The ITO transparent electrode 15B is an example of a transparent electrode.
This makes it possible to suppress reflection of the light components in the 1 st wavelength band and the 2 nd wavelength band due to the liquid crystal cell 17 or the ITO transparent electrode 15B, which reflect light particularly much in the liquid crystal display 10, and to improve visibility of display based on light emitted from the liquid crystal cell 17.
While the embodiments have been described with reference to the drawings, it is apparent that the present invention is not limited to these examples. It is apparent that those skilled in the art can conceive various modifications and adaptations within the scope of the claims and these are understood to fall within the technical scope of the present invention.
In the above embodiment, the 1 st filter 20 is a member constituting a part of the liquid crystal display 10, but may be constituted by another device than the liquid crystal display 10. In this case, the 1 st filter 20 is disposed in front of the liquid crystal display 10, and the same effects as described above can be obtained.
In the above embodiment, the 2 nd filter 40 is attached to the surface of the window 31 or the lighting fixture 35, but may be configured as another device than the window 31 or the lighting fixture 35. In this case, the 2 nd filter 40 is disposed in front of, for example, the window 31 or the lighting fixture 35, and the same effect as described above can be obtained.
In the above embodiment, the light control system 5 is installed in the room 3A of the house 3, but may be installed outside a digital signage installed in a station or the like, an automatic vending machine, an ATM of a bank, or the like. Accordingly, even in the outdoor environment where various light components are mixed, it is possible to suppress the deterioration of the display quality of the liquid crystal display 10 due to the reflection of the ambient light L2 to L4.
In the above embodiment, a highly directional light source such as a spotlight may be used as the light source instead of the lighting fixtures 35 and 35A. In this case, the light control system 5 can also suppress the ambient light provided by the spotlight by the 1 st filter 20 and the 2 nd filter 40.
In the above embodiment, the 1 st optical filter 20 is assumed to attenuate 2 wavelength bands of 495nm wavelength band and 595nm wavelength band, but may be an optical filter attenuating 1 wavelength band or 3 wavelength bands. In this case, the 2 nd filter 40 may be a filter attenuating 2 or less wavelength bands or 4 or more wavelength bands instead of a filter attenuating 3 wavelength bands other than the 495nm wavelength band and the 595nm wavelength band. The combination of the 1 st filter 20 and the 2 nd filter 40 may attenuate the light components in the respective wavelength bands of the ambient light, thereby improving the color reproducibility.
In the above embodiment, for example, the room 3A of the 1 st configuration example of the light control system 5 may be a space into which no light enters except the external light entering from the window 31. That is, the light control system 5 may be disposed in the room 3A as a space closed to light. In this case, since no light reaches the liquid crystal display 10 side except the ambient light L2 having light components in the wavelength bands of 495nm and 595nm, the light control system 5 can remove the ambient light L2 with high accuracy by the first optical filter 20, and can further improve color reproducibility.
While various embodiments have been described above with reference to the drawings, it is apparent that the present invention is not limited to these examples. It is apparent that those skilled in the art can conceive various modifications and adaptations within the scope of the claims and these are understood to fall within the technical scope of the present invention. In addition, the respective components of the above embodiments may be arbitrarily combined without departing from the scope of the invention.
It should be noted that the present application is based on japanese patent application (japanese patent application 2018-.
Industrial applicability
The present invention is useful for a light control system and the like that can suppress the deterioration of display quality of a display device due to reflection of ambient light.
Description of the reference numerals
3: a house;
3A: indoor;
5: a light control system;
7: an observer;
10: a liquid crystal display;
11: a liquid crystal display panel;
12A, 12B: a polarizing plate;
13A, 13B: a glass substrate;
14: a TFT substrate;
15A, 15B: an ITO transparent electrode;
16: a color filter;
17: a liquid crystal cell;
18: a backlight;
20: a1 st optical filter;
30: an ambient light providing unit;
31: a window;
35. 35A: a lighting fixture;
35 z: a light diffusing cover;
40: a2 nd optical filter;
100: a light control system for testing;
101: a light source;
105: a low reflection layer;
108: a non-pigmented adhesive;
130: a reflective plate;
g1, g2, sp1, sp 2: a graph;
l1: external light;
l2, L3, L4: ambient light;
rf: a reflection part.
Claims (9)
1. A light control system for controlling light in a space in which a display device is disposed,
comprises a display device and an ambient light providing unit,
the ambient light providing section provides the display device with ambient light having peak wavelengths in a1 st wavelength band and a2 nd wavelength band,
the display device includes:
a reflection unit that reflects the ambient light; and
and a1 st optical filter which is disposed on the observation side of the reflection unit and absorbs at least one of the light components in the 1 st wavelength band and the 2 nd wavelength band.
2. The light control system according to claim 1, wherein,
the 1 st wavelength band is a wavelength band between a red light component and a green light component,
the 2 nd wavelength band is a wavelength band between a blue light component and a green light component.
3. The light control system according to claim 1 or 2, wherein,
the ambient light providing unit includes a2 nd filter, and the 2 nd filter absorbs light components in wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band.
4. The light control system according to claim 3, wherein,
the environment light providing part is provided with a1 st light source,
the 2 nd filter is disposed between the 1 st light source and the display device.
5. The light control system according to claim 1 or 2, wherein,
the ambient light providing unit includes a2 nd light source, and the 2 nd light source emits light having a peak wavelength in the 1 st wavelength band and the 2 nd wavelength band as the ambient light.
6. The light control system according to any one of claims 1 to 5, wherein,
the 1 st optical filter has a1 st dye that absorbs at least one of light components in the 1 st wavelength band and the 2 nd wavelength band.
7. The light control system according to claim 3 or 4, wherein,
the 2 nd filter has a2 nd dye that absorbs light components of wavelength bands other than the 1 st wavelength band and the 2 nd wavelength band.
8. The light control system according to any one of claims 1 to 7, wherein,
the display device has a low reflection processed layer subjected to low reflection processing on the observation side of the 1 st filter.
9. The light control system according to any one of claims 1 to 8, wherein,
the reflective portion includes a liquid crystal cell or a transparent electrode.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-018660 | 2018-02-05 | ||
| JP2018018660 | 2018-02-05 | ||
| PCT/JP2019/003529 WO2019151458A1 (en) | 2018-02-05 | 2019-01-31 | Lighting control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111684345A true CN111684345A (en) | 2020-09-18 |
Family
ID=67479801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980011896.4A Pending CN111684345A (en) | 2018-02-05 | 2019-01-31 | Light control system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2019151458A1 (en) |
| KR (1) | KR20200112865A (en) |
| CN (1) | CN111684345A (en) |
| WO (1) | WO2019151458A1 (en) |
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- 2019-01-31 KR KR1020207022274A patent/KR20200112865A/en unknown
- 2019-01-31 CN CN201980011896.4A patent/CN111684345A/en active Pending
- 2019-01-31 JP JP2019569596A patent/JPWO2019151458A1/en active Pending
- 2019-01-31 WO PCT/JP2019/003529 patent/WO2019151458A1/en active Application Filing
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| US6690446B1 (en) * | 1999-10-15 | 2004-02-10 | Nec Lcd Technologies, Ltd. | Color liquid crystal display panel, manufacturing method of the same, and liquid crystal display |
| JP2012026716A (en) * | 2004-01-26 | 2012-02-09 | Masanobu Kujirada | Heating method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2019151458A1 (en) | 2021-02-25 |
| KR20200112865A (en) | 2020-10-05 |
| WO2019151458A1 (en) | 2019-08-08 |
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