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WO2011148701A1 - Filtre de couleur, et dispositif d'affichage du type à réflexion le comportant - Google Patents

Filtre de couleur, et dispositif d'affichage du type à réflexion le comportant Download PDF

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Publication number
WO2011148701A1
WO2011148701A1 PCT/JP2011/056036 JP2011056036W WO2011148701A1 WO 2011148701 A1 WO2011148701 A1 WO 2011148701A1 JP 2011056036 W JP2011056036 W JP 2011056036W WO 2011148701 A1 WO2011148701 A1 WO 2011148701A1
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Prior art keywords
photonic crystal
crystal layer
color filter
refractive index
light
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PCT/JP2011/056036
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English (en)
Japanese (ja)
Inventor
博敏 安永
有史 八代
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
    • G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • 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
    • G02F1/133514—Colour filters
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/30—Metamaterials

Definitions

  • the present invention relates to a color filter using a photonic crystal structure and a reflective display device including the color filter.
  • display devices are roughly classified into a transmissive display device and a reflective display device based on the display method.
  • a transmissive display device is a display device in which a backlight as a light source is provided on the back side of the display unit, and an image displayed on the display unit can be visually recognized using light emitted from the backlight. It is to make.
  • the reflective display device reflects external light incident from the display surface side of the display unit on the back surface side of the display unit, thereby making it possible to visually recognize an image displayed on the display unit using the reflected light. Is.
  • the reflective display device has an advantage that it consumes less power than the transmissive display device in that it does not require a backlight. Therefore, the power consumption of the reflective display device is particularly low in mobile phones, portable music players, electronic paper, and the like. It is suitable for use in required equipment.
  • reflective display devices generally tend to darken the screen, and are inferior to transmissive display devices in terms of visibility, and so have not been widely used.
  • the phenomenon that the screen becomes dark is partly due to the low utilization efficiency of incident light, and the improvement is strongly desired.
  • color filters used for display devices for example, those using pigments such as red, green and blue are used.
  • pigments such as red, green and blue
  • the hue is determined by the light absorption spectrum exhibited by the pigment, it is necessary to configure the color filter to be thick to some extent. It tends to end up.
  • the amount of light that can be used for display is determined by the amount of incident external light, so when using a color filter using a pigment as described above in the reflective display device, If an attempt is made to reproduce high color purity, the light transmittance is lowered, resulting in a problem that the screen brightness is greatly lowered.
  • Photonic crystal structure is a general term for nanostructures whose refractive index changes periodically. By making the period of change of the refractive index below the wavelength of incident light, high wavelength selectivity can be realized. is there. Therefore, by adopting a color filter using a photonic crystal structure, it becomes possible to selectively reflect light of a specific wavelength and transmit light of other wavelengths in the color filter.
  • a color filter using a photonic crystal structure since the hue is determined by the light band of the photonic crystal structure, a high reflectance can be realized by using an appropriate structure. Therefore, in the reflective display device, if the color filter using the photonic crystal structure as described above is used, the screen brightness can be greatly improved as compared with the conventional case.
  • the photonic crystal structure has a one-dimensional photonic crystal structure based on whether the periodic change in refractive index is one-dimensional, two-dimensional, or three-dimensional. It is roughly classified into a two-dimensional photonic crystal structure and a three-dimensional photonic crystal structure. Conventionally, it has been studied that a one-dimensional photonic crystal structure is applied to a color filter, but the one-dimensional photonic crystal structure has sufficient wavelength selectivity due to the influence of polarization dependence and light incident angle dependence. There was a problem that the reflectance could not be obtained.
  • Patent Document 1 proposes to apply a two-dimensional photonic crystal structure to a color filter for the purpose of further improving wavelength selectivity and reflectance.
  • Patent Document 1 providing a two-dimensional photonic crystal structure on a transparent substrate, and comprising a color filter by these transparent substrates and a two-dimensional photonic crystal structure is disclosed. Has been.
  • the two-dimensional photonic crystal structure has a smaller wavelength selectivity and lower reflectance due to the influence of polarization dependency and light incident angle dependency than the one-dimensional photonic crystal structure. For this reason, the reflective display device including the color filter using the two-dimensional photonic crystal structure can achieve both high color purity and improvement in screen luminance.
  • the two-dimensional photonic crystal structure has a smaller wavelength selectivity and lower reflectance due to the influence of polarization dependency and light incident angle dependency than the one-dimensional photonic crystal structure, the polarization dependency and light incident angle are small. There is a problem that the reflectance is still lowered due to the influence of dependency.
  • the electric field oscillates perpendicularly to the incident surface that is, perpendicular to the reflecting surface that reflects the incident light beam and includes the incident light beam and the reflected light beam.
  • the influence of the light incident angle dependency is small, so that even when the light incident angle is large, the wavelength selectivity and the reflectance are hardly lowered, but the p-polarized light whose electric field oscillates parallel to the incident surface.
  • the influence of the light incident angle dependency is large, and as a result, as the light incident angle increases, the reflectance decreases significantly.
  • the present invention has been made to solve the above-described problems, and its object is to provide a color filter excellent in wavelength selectivity and reflectance, and using the color filter. Accordingly, an object of the present invention is to provide a reflective display device with excellent visibility.
  • a color filter according to the present invention includes a half-wave plate having a front surface and a back surface, a surface-side photonic crystal layer having a two-dimensional refractive index periodic structure and disposed on the front surface side of the half-wave plate, A back-side photonic crystal layer having a three-dimensional refractive index periodic structure and disposed on the back side of the half-wave plate.
  • the front-side photonic crystal layer includes a first photonic crystal region having a first periodic refractive index change, and the back-side photonic crystal.
  • the layer includes a second photonic crystal region having a periodic refractive index change substantially the same as the first periodic refractive index change.
  • the first photonic crystal region and the second photonic crystal region are arranged corresponding to each other with the half-wave plate interposed therebetween.
  • the surface-side photonic crystal layer has a third periodic refractive index change different from the first periodic refractive index change.
  • the back-side photonic crystal layer further includes a fourth photonic crystal region having a periodic refractive index change substantially the same as the second periodic refractive index change. Also good. In that case, it is preferable that the third photonic crystal region and the fourth photonic crystal region are arranged corresponding to each other with the half-wave plate interposed therebetween.
  • the surface-side photonic crystal layer has a third period different from both the first periodic refractive index change and the second periodic refractive index change.
  • a fifth photonic crystal region having a typical refractive index change, and the back-side photonic crystal layer has a periodic refractive index change substantially the same as the third periodic refractive index change.
  • a sixth photonic crystal region having the following may be further included. In that case, it is preferable that the fifth photonic crystal region and the sixth photonic crystal region are arranged correspondingly with the half-wave plate interposed therebetween.
  • the color filter according to the present invention further includes a front-side light-transmitting substrate disposed on the front surface of the half-wave plate and a back-side light-transmitting substrate disposed on the back surface of the half-wave plate.
  • the surface-side photonic crystal layer is provided on the main surface of the surface-side translucent substrate opposite to the main surface on which the half-wave plate is located, and the back surface side. It is preferable that the photonic crystal layer is provided on the main surface on the side opposite to the main surface on the side where the half-wave plate of the back-side translucent substrate is located.
  • the front-side photonic crystal layer and the back-side photonic crystal layer are arranged in a two-dimensional lattice pattern, and the plurality of block structures. It is preferable that it is comprised by the space
  • the front-side photonic crystal layer and the back-side photonic crystal layer are arranged in a two-dimensional lattice pattern, and the plurality of block structures. It is preferable that it is comprised with the translucent member filled between.
  • the reflection type display device includes any one of the color filters described above and an optical switching unit disposed to face the surface-side photonic crystal layer of the color filter.
  • the optical switching unit is configured by a MEMS (Micro Electro Mechanical Systems) shutter.
  • a color filter having excellent wavelength selectivity and reflectance can be obtained, and a reflective display device having excellent visibility can be obtained by using the color filter.
  • FIG. 1 It is sectional drawing of the color filter in Embodiment 1 of this invention. It is a top view of the color filter shown in FIG. It is a bottom view of the color filter shown in FIG. It is a schematic diagram for demonstrating the function of the color filter in Embodiment 1 of this invention. It is a schematic cross-sectional view showing a typical light path when white light is irradiated to a red filter portion of a conventional color filter using a photonic crystal structure. It is a schematic cross section which shows the path
  • FIG. 1 is a cross-sectional view of a color filter according to Embodiment 1 of the present invention.
  • 2 is a top view of the color filter shown in FIG. 1
  • FIG. 3 is a bottom view of the color filter shown in FIG.
  • FIG. 4 is a schematic diagram for explaining the function of the color filter in the present embodiment.
  • the color filter 1A is a so-called RGB color filter including a red filter portion 2R, a green filter portion 2G, and a blue filter portion 2B.
  • the color filter 1A is configured to have a flat outer shape as a whole, and usually includes a plurality of red filter portions 2R, green filter portions 2G, and blue filter portions 2B as shown in the drawing as unit units. Configured as follows.
  • the color filter 1A includes a half-wave plate 3, a front-side translucent substrate 4, a front-side photonic crystal layer 5, a back-side translucent substrate 6, and a back-side photonic crystal layer 7. It is comprised as a laminated body of these.
  • Each of the red filter portion 2R, the green filter portion 2G, and the blue filter portion 2B described above includes a front-side photonic crystal layer 5, a half-wave plate 3 and a back surface that are mainly located at portions corresponding to the filter portions 2R, 2G, and 2B.
  • the side photonic crystal layer 7 is constituted.
  • the half-wave plate 3 is an optical system that generates a phase difference of 1 ⁇ 2 wavelength in light, and has a function of rotating the incident light beam by rotating it by 90 °.
  • the half-wave plate 3 is made of natural crystals such as quartz, mica, and karsite.
  • the half-wave plate 3 is composed of a flat member having a front surface and a back surface as a pair of main surfaces, and the thickness thereof is uniquely determined by the material.
  • the front-side light-transmitting substrate 4 is made of a flat plate member that can transmit light, and is disposed on the surface of the half-wave plate 3 described above.
  • the surface side light-transmitting substrate 4 is made of, for example, a glass substrate or a transparent plastic substrate, and the thickness is not particularly limited, but is preferably about 780 nm to 900 ⁇ m.
  • the surface-side photonic crystal layer 5 has a first photonic crystal region having a first periodic refractive index change, and a second periodic refractive index change different from the first periodic refractive index change.
  • the first photonic crystal region is disposed in a portion corresponding to the red filter portion 2R
  • the third photonic crystal region is disposed in a portion corresponding to the green filter portion 2G
  • the fifth photonic crystal region is , And is disposed at a portion corresponding to the blue filter portion 2B.
  • the back-side light-transmitting substrate 6 is made of a flat plate member that can transmit light, and is disposed on the back surface of the half-wave plate 3 described above.
  • the back side light-transmitting substrate 6 is made of, for example, a glass substrate or a transparent plastic substrate, and the thickness is not particularly limited, but is preferably about 780 nm to 900 ⁇ m.
  • the back-side photonic crystal layer 7 has a two-dimensional refractive index periodic structure, and more specifically, a plurality of block structures 7a arranged in a two-dimensional lattice, and the plurality of block structures 7a. And a gap portion located between the two.
  • the back-side photonic crystal layer 7 is provided on the main surface opposite to the main surface on the side where the half-wave plate 3 is located, of the pair of main surfaces of the back-side light-transmitting substrate 6.
  • the plurality of block structures 7a described above are composed of, for example, Si, SiC, ZnS, AlN, BN, GaTe, AgI, TiO 2 , SiON, GaP, or a composite thereof.
  • the back-side photonic crystal layer 7 includes a second photonic crystal region having substantially the same periodic refractive index change as the above-described first periodic refractive index change, and the above-described second periodic refraction.
  • the second photonic crystal region is disposed in a portion corresponding to the red filter portion 2R
  • the fourth photonic crystal region is disposed in a portion corresponding to the green filter portion 2G
  • the sixth photonic crystal region is , And is disposed at a portion corresponding to the blue filter portion 2B.
  • the arrangement pitch D R (that is, the period of the first periodic refractive index change) of the plurality of block structures 5a and 7a arranged in a two-dimensional lattice is about 300 nm, and each block structure 5a , 7a has a width L R of about 150 nm, and each of the block structures 5a, 7a has a height H R of about 250 nm.
  • the arrangement pitch D G (that is, the period of the second periodic refractive index change) of the plurality of block structures 5a and 7a arranged in a two-dimensional lattice is about 240 nm, and each block structure 5a, is the width L G of about 120nm of 7a, each block structure 5a, the height HG of 7a is about 190 nm.
  • the arrangement pitch D B (that is, the period of the third periodic refractive index change) of the plurality of block structures 5a and 7a arranged in a two-dimensional lattice is set to about 210 nm, and each block structure 5a, is a 7a width L B of about 105nm of each of the block structure 5a, the height HB of 7a is about 170 nm.
  • the color filter 1A in the present embodiment when white light is irradiated to the main surface on the side where the surface-side photonic crystal layer 5 of the color filter 1A is disposed, In the red filter portion 2R, only light in a wavelength range mainly exhibiting red color (light in a wavelength of 620 nm to 750 nm) is selectively reflected, light in other wavelength ranges is transmitted, and green color is mainly displayed in the green filter portion 2G.
  • wavelength band light having a wavelength of 495 nm to 570 nm
  • light in other wavelength bands is transmitted
  • light in a wavelength band mainly exhibiting blue (wavelength of 450 nm to 495 nm) is transmitted in the blue filter portion 2B.
  • Only light) is selectively reflected, and light in other wavelength ranges is transmitted.
  • the wavelength selectivity as a color filter is implement
  • FIG. 5 is a schematic cross-sectional view showing a typical light path when white light is irradiated on a red filter portion of a conventional color filter using a photonic crystal structure
  • FIG. 6 shows the present embodiment. It is a schematic cross section which shows the path
  • the color filter according to the present embodiment is superior in wavelength selectivity and reflectivity compared to the conventional color filter using a photonic crystal structure. A mechanism that can be used as a color filter will be described.
  • a two-dimensional surface is formed on the surface which is one of the main surfaces of the pair of translucent substrates 4 ′.
  • a photonic crystal layer 5 'having a refractive index periodic structure is provided.
  • the photonic crystal layer 5 ' includes a plurality of block structures 5a' arranged in a two-dimensional lattice.
  • the conventional color filter 1 ′ when white light such as natural light is applied to the red filter portion 2R ′, light other than red light 100R such as green light 100G and blue light 100B included in the white light is selected. Thus, the light passes through the photonic crystal layer 5 'and further passes through the light transmitting substrate 4'. On the other hand, at least a part of the red light 100R included in the white light is selectively reflected in the photonic crystal layer 5 ′.
  • the photonic crystal layer 5 ′ has a so-called two-dimensional photonic crystal structure having a two-dimensional refractive index periodic structure as described above, the photonic crystal layer 5 ′ is perpendicular to the incident surface (that is, the reflection surface that reflects incident light).
  • the s-polarized light whose electric field oscillates perpendicularly to the plane including the incident light and the reflected light has little influence on the light incident angle, so that even when the light incident angle is large, wavelength selectivity and reflection
  • the p-polarized light whose electric field oscillates in parallel to the incident surface has a large influence on the light incident angle, so that the decrease in the reflectivity becomes remarkable as the light incident angle increases. Become.
  • the p-polarized component 100R (p) of the red light 100R is transmitted without being reflected by the photonic crystal layer 5 ′. Only the s-polarized component 100R (s) of the red light 100R is reflected by the photonic crystal layer 5 ′, and the reflectance of the red filter portion 2R ′ is significantly reduced. Although illustration and explanation thereof are omitted, the above phenomenon also occurs in the filter portions of other colors.
  • the front-side light-transmitting substrate 4 and the back-side light-transmitting substrate 6 are arranged so as to sandwich the half-wave plate 3 therebetween.
  • the photonic crystal layer 5 having a two-dimensional refractive index periodic structure is provided on the main surface of the front surface side transparent substrate 4, and the two-dimensional refractive index periodic structure is provided on the main surface of the rear surface side transparent substrate 6.
  • a photonic crystal layer 7 is provided.
  • red light 100R such as green light 100G and blue light 100B included in white light
  • the light is selectively transmitted through the surface-side photonic crystal layer 5 and further sequentially transmitted through the surface-side translucent substrate 4, the half-wave plate 3, the back-side translucent substrate 6, and the back-side photonic crystal layer 7.
  • at least a part of the red light 100R included in the white light is selectively reflected by the front surface side photonic crystal layer 5, and at least a part of the red light 100R is also selectively reflected by the back surface side photonic crystal layer 7. Will be reflected.
  • the s-polarized component 100R (s) of the red light 100R is reflected by the surface-side photonic crystal layer 5 and the p-polarized component of the red light 100R.
  • 100R (p) is transmitted without being reflected by the surface-side photonic crystal layer 5, but the p-polarized component 100R (p) of the transmitted red light 100R is transmitted through the surface-side light-transmitting substrate 4 and is a half-wave plate. 3 is incident.
  • the p-polarized component 100R (p) of the red light 100R incident on the half-wave plate 3 is converted into the s-polarized component 100R (s) because the vibration direction is rotated by 90 ° when passing through the half-wave plate 3.
  • the light enters the back side translucent substrate 6.
  • the converted s-polarized component 100R (s) incident on the back-side translucent substrate 6 passes through the back-side translucent substrate 6 and is irradiated on the back-side photonic crystal layer 7. Since the converted s-polarized component 100R (s) irradiated to the back-side photonic crystal layer 7 is s-polarized light whose electric field oscillates perpendicularly to the incident surface, the influence of the light incident angle dependency is small. Therefore, even when the light incident angle ⁇ is large, the light is reflected with a high reflectance.
  • the s-polarized component 100R (s) reflected by the back-side photonic crystal layer 7 passes through the back-side translucent substrate 6 and enters the half-wave plate 3 again.
  • the reflected s-polarized component 100R (s) incident on the half-wave plate 3 is rotated by 90 ° when passing through the half-wave plate 3, so that it is converted into the p-polarized component 100R (p) and the surface.
  • the light enters the side translucent substrate 4.
  • the converted p-polarized component 100R (p) incident on the surface-side translucent substrate 4 is transmitted through the surface-side translucent substrate 4 and irradiated on the surface-side photonic crystal layer 5.
  • the converted p-polarized component 100R (p) irradiated to the surface-side photonic crystal layer 5 is p-polarized light whose electric field oscillates perpendicularly to the incident surface, and therefore has a large influence on the light incident angle dependency. Therefore, when the light incident angle ⁇ is large, the light passes through the surface side photonic crystal layer 5.
  • the red light 100R included in the white light irradiated on the red filter portion 2R is reflected on the surface side photo.
  • At least a part of the nick crystal layer 5 is selectively reflected, and at least a part of the nick crystal layer 5 is also selectively reflected by the back-side photonic crystal layer 7. Therefore, by using the color filter 1A in the present embodiment, not only the red light reflected on the front-side photonic crystal layer 5 but also the back-side photonic crystal, compared to the conventional color filter 1 ′ described above.
  • the red light reflected in the layer 7 is obtained as the reflected light in the red filter portion 2R of the color filter 1A, and the reflectance in the red filter portion 2R as a whole is greatly improved. Although illustration and description thereof are omitted, the improvement in the reflectance can be similarly obtained in the filter portions of other colors.
  • the color filter 1A in the present embodiment by using the color filter 1A in the present embodiment, the p-polarized component of incident light that could not be used in the conventional color filter 1 ′ described above is reflected in the back-side photonic crystal layer 7. It can be used after being reflected and emitted from the surface side of the color filter 1A. Therefore, by using the color filter 1A in the present embodiment, a decrease in wavelength selectivity and reflectance due to the influence of polarization dependency and incident angle dependency can be greatly reduced. As a result, wavelength selectivity and A color filter having excellent reflectance can be obtained.
  • FIG. 7 to 18 specifically design the color filter according to the example based on the present embodiment, and show the reflection characteristics in the front-side photonic crystal layer and the back-side photonic crystal layer of the designed color filter. It is a graph which shows the result computed based on RCWA (Rigorous Coupled Wave Analysis) method. More specifically, FIG. 7 and FIG. 8 are graphs showing the light incident angle dependence of the reflection characteristics of the surface-side photonic crystal layer of the red filter portion of the color filter according to the example. FIG. 11 is a graph showing the light incident angle dependence of the reflection characteristics of the surface-side photonic crystal layer of the green filter portion of the color filter according to the embodiment. FIGS. 11 and 12 are blue filter portions of the color filter according to the embodiment.
  • RCWA Ragorous Coupled Wave Analysis
  • FIG. 13 and 14 are graphs showing the light incident angle dependency of the reflection characteristics of the back side photonic crystal layer of the red filter portion of the color filter according to the example.
  • FIGS. 15 and 16 are graphs showing the example.
  • FIG. 17 and FIG. 18 are graphs showing the light incident angle dependence of the reflection characteristics of the back side photonic crystal layer of the green filter part of the color filter according to FIG. It is a graph which shows the light incident angle dependence of the reflection characteristic of a photonic crystal layer.
  • the surface-side photonic crystal layer has generally good reflection characteristics when the light incident angle ⁇ is 0 °, 10 °, and 20 ° (that is, the reflectance is approximately 0.6).
  • the reflection characteristics greatly decrease (that is, the reflectivity becomes less than about 0.6). It can be confirmed that there is a tendency to decrease).
  • the light incident on the surface-side photonic crystal layer is white light including an s-polarized component and a p-polarized component, and the decrease in the reflection characteristics described above is based on the light incident angle dependency.
  • the conventional color filter described above is configured such that incident light is reflected only by the surface-side photonic crystal layer as described above, the result is the same as the conventional color filter described above. It also shows the reflection characteristics of the filter.
  • the light incident on the back-side photonic crystal layer is mainly light of the s-polarized component generated by converting the p-polarized component transmitted through the front-side photonic crystal layer by the action of the latter half wave plate.
  • the above-described reflection characteristics generally mean the reflectance of the s-polarized component.
  • FIG. 19 is a cross-sectional view of the color filter according to Embodiment 2 of the present invention.
  • the structure of the color filter in the present embodiment will be described with reference to FIG.
  • symbol is attached
  • the color filter 1B is a so-called RGB including a red filter portion 2R, a green filter portion 2G, and a blue filter portion 2B, similarly to the color filter 1A according to the first embodiment. It is a color filter.
  • the color filter 1B includes a half-wave plate 3, a front-side translucent substrate 4, a front-side photonic crystal layer 5, a back-side translucent substrate 6, and a back-side photonic crystal layer 7, which are laminated. It is structured as a body.
  • Each of the red filter portion 2R, the green filter portion 2G, and the blue filter portion 2B described above includes a front-side photonic crystal layer 5, a half-wave plate 3 and a back surface that are mainly located at portions corresponding to the filter portions 2R, 2G, and 2B.
  • the side photonic crystal layer 7 is constituted.
  • the surface-side translucent member 8 is formed on the main surface of the surface-side translucent substrate 4 so as to seal the plurality of block structures 5a included in the surface-side photonic crystal layer 5.
  • a back surface side light transmissive member 9 is provided on the main surface of the back surface side light transmissive substrate 6 so as to seal a plurality of block structures 7a included in the back surface side photonic crystal layer 7. That is, on the main surface of the front surface side transparent substrate 4, the space between the plurality of block structures 5a is filled with the front surface side transparent member 8, and on the main surface of the rear surface side transparent substrate 6, A space between the plurality of block structures 7 a is filled with the back surface side light transmissive member 9.
  • the surface side photonic crystal layer 5 is comprised by the several block structure 5a arranged in the two-dimensional lattice form, and the surface side translucent member 8 with which the space between these several block structures 5a is filled.
  • the back-side photonic crystal layer 7 is composed of a plurality of block structures 7a arranged in a two-dimensional lattice, and a back-side translucent member 9 filling between the plurality of block structures 7a. Will be composed.
  • the surface side translucent member 8 and the back surface side translucent member 9 are comprised, for example with a transparent organic substance, and the thickness is not specifically limited.
  • the wavelength selectivity or the wavelength selectivity due to the influence of the polarization dependency or the incident angle dependency is similar to the case of the color filter 1A according to the first embodiment.
  • a decrease in reflectance can be greatly reduced. Therefore, by using the color filter 1B having the configuration, a color filter having excellent wavelength selectivity and reflectance can be obtained.
  • FIG. 20 is a schematic cross-sectional view of a reflective display device according to Embodiment 3 of the present invention.
  • the structure of the reflective display device according to the present embodiment will be described with reference to FIG.
  • symbol is attached
  • the reflective display device 10A in the present embodiment includes the color filter 1A in the first embodiment described above.
  • the reflective display device 10A mainly includes a color filter 1A, a TFT (Thin Film Transistor) substrate 12, a liquid crystal layer 13, a counter substrate 14, a polarizing plate 15, a light shielding substrate 16, and a support member 17. Yes.
  • TFT Thin Film Transistor
  • the TFT substrate 12 mainly includes a translucent substrate 12a provided with TFTs (not shown), a transparent electrode layer 12b, and an alignment film (not shown), and the surface-side photonic crystal layer of the color filter 1A. 5 is arranged opposite to the main surface provided.
  • the transparent electrode layer 12b is provided on the upper surface of the transparent substrate 12a, and the alignment film is provided on the upper surface of the transparent substrate 12a so as to cover the transparent electrode layer 12b and the TFT.
  • the translucent substrate 12a is made of, for example, a glass substrate or a transparent plastic substrate having a sufficiently low refractive index
  • the transparent electrode layer 12b is made of, for example, an ITO (Indium Thin Oxide) film or the like.
  • the alignment film is composed of, for example, a polyimide film.
  • the counter substrate 14 mainly includes a translucent substrate 14 a, a transparent electrode layer 14 b, and an alignment film (not shown), and is disposed to face the upper surface of the TFT substrate 12.
  • the transparent electrode layer 14b is provided on the lower surface of the translucent substrate 14a, and the alignment film is provided on the lower surface of the translucent substrate 14a so as to cover the transparent electrode layer 14b.
  • the translucent substrate 14a is composed of, for example, a glass substrate or a transparent plastic substrate having a sufficiently low refractive index
  • the transparent electrode layer 14b is composed of, for example, an ITO film.
  • the alignment film is composed of, for example, a polyimide film.
  • the liquid crystal layer 13 functions as an optical switching unit, and is configured by filling a liquid crystal in the space between the TFT substrate 12 and the counter substrate 14 described above.
  • a liquid crystal nematic, smectic, cholesteric, or a mixture thereof can be applied.
  • As the alignment state of the liquid crystal molecules homogeneous, homeotropic, twist, hybrid, bend and the like are preferable.
  • the thickness of the liquid crystal layer 13 is preferably 10 ⁇ m or less.
  • the polarizing plate 15 is formed by laminating a protective film, a polarizing portion, a protective film, and an adhesive in this order from the top, and is disposed on the upper surface of the counter substrate 14 described above.
  • the protective film triacetyl cellulose is suitably used, and the thickness thereof is preferably 40 ⁇ m or less.
  • a material obtained by adsorbing and dispersing a material such as iodine or a dye on a polyvinyl alcohol film and stretching it in one direction is preferably used, and the thickness is preferably 25 ⁇ m to 30 ⁇ m.
  • the light shielding substrate 16 is, for example, a substrate whose surface is coated with a black matrix, and is disposed so as to face the main surface on which the back surface side photonic crystal layer 7 of the color filter 1A is provided.
  • the support member 17 functions as a spacer and holder for holding the color filter 1A, the TFT substrate 12, the liquid crystal layer 13, the counter substrate 14, the polarizing plate 15, and the light shielding substrate 16 in a stacked state.
  • a substrate coated with a black matrix is used.
  • the distance g between the surface-side photonic crystal layer 5 and the liquid crystal layer 13 is preferably 780 nm or more, which is the longest wavelength of visible light. This is to prevent unintended light interference between the photonic crystal layer 7 and the liquid crystal layer 13, and if there is no interference within the range of visible light, the function as a reflective display device is achieved. It is because it is not inhibited.
  • the reflective display device 10A in the present embodiment described above By adopting the reflective display device 10A in the present embodiment described above, a wide viewing angle is ensured, and both high color purity and improvement in screen luminance are achieved within the wide viewing angle range.
  • a reflective display device can be obtained. This is because the reflective display device 10 ⁇ / b> A includes the color filter 1 ⁇ / b> A according to Embodiment 1 described above, which is excellent in wavelength selectivity and reflectance. Therefore, by using the reflective display device 10A having the above configuration, a reflective display device with excellent visibility can be obtained.
  • FIG. 21 is a schematic cross-sectional view of a reflective display device according to Embodiment 4 of the present invention.
  • the structure of the reflective display device according to the present embodiment will be described with reference to FIG.
  • symbol is attached
  • the reflective display device 10B includes the color filter 1B according to the second embodiment described above, and the configuration thereof is the reflection according to the third embodiment described above. It conforms to the type display device 10A.
  • the reflective display device 10B mainly includes a color filter 1B, a transparent electrode layer 8a, a liquid crystal layer 13, a counter substrate 14, a polarizing plate 15, a light shielding substrate 16, and a support member 17.
  • the transparent electrode layer 8a is provided on the upper surface of the surface side light transmitting member 8 of the color filter 1B, and a TFT (not shown) is further provided on the upper surface of the surface side light transmitting member 8.
  • an alignment film (not shown) is provided on the upper surface of the surface-side translucent member 8 so as to cover the transparent electrode layer 8a and the TFT. That is, in the reflective display device 10B in the present embodiment, the translucent substrate 12a of the TFT substrate 12 included in the reflective display device 10A in the above-described third embodiment is used as the surface-side translucent member 8 of the color filter 1B.
  • the other configuration is the same as that of the reflective display device 10A according to the third embodiment described above.
  • FIG. 22 is a schematic cross-sectional view of a reflective display device according to Embodiment 5 of the present invention.
  • the structure of the reflective display device according to the present embodiment will be described with reference to FIG.
  • symbol is attached
  • the reflective display device 10C includes the color filter 1A according to the first embodiment described above, and the configuration thereof is the reflection according to the third embodiment described above. It conforms to the type display device 10A.
  • the reflective display device 10 ⁇ / b> C mainly includes a color filter 1 ⁇ / b> A, a MEMS shutter 18, a translucent substrate 19, a polarizing plate 15, a light shielding substrate 16, and a support member 17.
  • the reflective display device 10C in the present embodiment is different from the reflective display device 10A in the third embodiment described above in the configuration of the optical switching unit, and the other configurations are the reflection in the third embodiment described above. This is the same as the type display device 10A.
  • the translucent substrate 19 is disposed to face the main surface of the color filter 1A on which the surface-side photonic crystal layer 5 is provided, and is composed of, for example, a glass substrate or a transparent plastic substrate having a sufficiently low refractive index.
  • the translucent substrate 19 corresponds to a base material on which the MEMS shutter 18 is formed, and the MEMS shutter 18 is provided on the lower surface of the translucent substrate 19.
  • the MEMS shutter 18 is an optical switching unit formed by applying MEMS technology, and serves as an alternative to the liquid crystal layer 13 in the third embodiment described above.
  • the MEMS shutter 18 is an element having a shutter structure capable of mechanically controlling the passage / shielding of light, and, for example, a MEMS shutter element manufactured by PIXTRONIX can be suitably used.
  • a shutter as disclosed in JP-T-2008-533510 can be used.
  • the color filter is described by exemplifying a so-called RGB color filter including a red filter portion, a green filter portion, and a blue filter portion.
  • the number of filter units is not particularly limited, and includes a color filter that includes only one type of filter unit, a color filter that includes only two types of filter units, and four or more types of filter units.
  • the block structure provided in the photonic crystal structure provided in the color filter is exemplified as a rectangular parallelepiped, but the block structure
  • the shape of the body is not limited to this, and block structures having various shapes such as a columnar shape and a polygonal column shape can be used.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Filters (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

L'invention porte sur un filtre de couleur (1A), qui comprend : une plaque demi-onde (3) qui a une surface avant et une surface arrière ; une couche de cristal photonique côté surface avant (5) qui a une structure périodique photonique à deux dimensions et qui est formée sur le côté de surface avant de la plaque demi-onde (3) ; et une couche de cristal photonique côté surface arrière (7), qui a une structure périodique photonique à deux dimensions et qui est formée sur le côté de surface arrière de la plaque demi-onde (3).
PCT/JP2011/056036 2010-05-28 2011-03-15 Filtre de couleur, et dispositif d'affichage du type à réflexion le comportant Ceased WO2011148701A1 (fr)

Applications Claiming Priority (2)

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JP2010-122706 2010-05-28
JP2010122706A JP2013164429A (ja) 2010-05-28 2010-05-28 カラーフィルタおよびこれを備えた反射型表示装置

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WO2011148701A1 true WO2011148701A1 (fr) 2011-12-01

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Cited By (1)

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WO2013054115A1 (fr) * 2011-10-10 2013-04-18 Lamda Guard Canada Inc Filtre constitué de métamatériaux

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KR20210055450A (ko) 2019-11-07 2021-05-17 삼성전자주식회사 광학 필터 및 이를 포함하는 분광기 및 전자 장치

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JP2001350040A (ja) * 2000-06-06 2001-12-21 Tokin Corp 光フィルタ
JP2003131039A (ja) * 2001-10-29 2003-05-08 Kyocera Corp 光学フィルタモジュール
JP2008033279A (ja) * 2006-06-28 2008-02-14 Konica Minolta Holdings Inc 領域分割型波長板及びその製造方法
WO2009093452A1 (fr) * 2008-01-23 2009-07-30 Panasonic Corporation Dispositif diviseur de longueur d'onde, et dispositif d'éclairage de type plat et dispositif d'affichage à cristaux liquides utilisant ledit dispositif diviseur
JP2010078795A (ja) * 2008-09-25 2010-04-08 Panasonic Corp 液晶表示装置

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JP2001350040A (ja) * 2000-06-06 2001-12-21 Tokin Corp 光フィルタ
JP2003131039A (ja) * 2001-10-29 2003-05-08 Kyocera Corp 光学フィルタモジュール
JP2008033279A (ja) * 2006-06-28 2008-02-14 Konica Minolta Holdings Inc 領域分割型波長板及びその製造方法
WO2009093452A1 (fr) * 2008-01-23 2009-07-30 Panasonic Corporation Dispositif diviseur de longueur d'onde, et dispositif d'éclairage de type plat et dispositif d'affichage à cristaux liquides utilisant ledit dispositif diviseur
JP2010078795A (ja) * 2008-09-25 2010-04-08 Panasonic Corp 液晶表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013054115A1 (fr) * 2011-10-10 2013-04-18 Lamda Guard Canada Inc Filtre constitué de métamatériaux
US10698143B2 (en) 2011-10-10 2020-06-30 Lamda Guard Technologies Ltd. Filter made of metamaterials
US10996385B2 (en) 2011-10-10 2021-05-04 Lamda Guard Technologies Ltd. Filter made of metamaterials

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