WO2021220842A1 - Display device and optical adjustment sheet - Google Patents

Abstract

A display device (1) is illuminated with first light (L10), and the display device (1) is provided with: a display surface part (2) that emits second light (L20) displaying an image; and an optical adjustment sheet (10) that has a first surface (11) on which the first light (L10) is incident and a second surface (12) on which the second light (L20) is incident, and reflects light. The second light (L20) has a plurality of emission peak wavelengths, and when a condition that a reflection peak wavelength (λr) is located between two emission peak wavelengths adjacent to each other is defined as a first condition, a condition that the reflection peak wavelength (λr) is located between the shortest emission peak wavelength and 380 nm is defined as a second condition, and a condition that the reflection peak wavelength (λr) is located between the longest emission peak wavelength and 780 nm is defined as a third condition, a reflection spectrum satisfies at least one of the first condition, the second condition, and the third condition.

Description

Display device and optical adjustment sheet

The present invention relates to a display device and an optical adjustment sheet.

With the spread of IOT (Internet of Things) home appliances, voice operation devices, etc., display devices such as monitors, tablet terminals, and televisions connected to personal computers are increasing in houses and public facilities.

Generally, when the display device is turned off, the display surface portion of the display device is black. Therefore, the display device does not fit into the interior or exterior of the house or public facility in which the display device is installed, and deteriorates the design of the space such as the house or public facility.

Therefore, a display device aimed at enhancing the design of the space has been studied.

For example, Patent Document 1 discloses a display device including a display surface portion and a half mirror covering the display surface portion. In this display device, it is not noticeable that the display surface portion is black because the half mirror covers the display surface portion. Therefore, it is expected that the deterioration of the design of the space will be suppressed.

Japanese Unexamined Patent Publication No. 2006-53277

However, when this display device is turned off, the display surface is always mirrored, that is, the display surface is always visually recognized as a mirror, so it is difficult to sufficiently improve the design of the space.

In addition, in order to enhance the design of the space, a decoration with low translucency (for example, a sticker or a sticker) may be applied to the display surface portion which is black. However, in this case, when the display device is lit, the display surface portion is shielded by the decoration, which has an effect such that the visibility of the image displayed on the display surface portion is lowered.

Therefore, the present invention provides a display device or the like that has little influence on the displayed image when it is turned on and can enhance the design of the space when it is turned off.

The display device according to one aspect of the present invention is a display device illuminated by the first light emitted by the first light source, and is provided so as to cover the display surface portion that emits the second light for displaying an image and the display surface portion. It has a first surface on which the first light is incident and a second surface on which the second light is incident, facing back to the first surface, and is located in a predetermined wavelength region of the first light and the second light. An optical adjustment sheet that reflects light is provided, and the second light has a plurality of emission peak wavelengths, and in the reflection spectrum of the optical adjustment sheet, the reflection peak wavelengths are adjacent to each other among the plurality of emission peak wavelengths. The first condition is a condition that is located between the two emission peak wavelengths and the reflection peak half-price width is equal to or less than the difference between the two adjacent emission peak wavelengths, and the reflection peak wavelength is among the plurality of emission peak wavelengths. The second condition is a condition that is located between the shortest emission peak wavelength and 380 nm and the half-value width of the reflection peak is equal to or less than the difference between the shortest emission peak wavelength and 380 nm. When the third condition is a condition that is located between the longest emission peak wavelength of the peak wavelength and 780 nm and the half-value width of the reflection peak is equal to or less than the difference between the longest emission peak wavelength and 780 nm, the reflection The spectrum satisfies at least one of the first condition, the second condition and the third condition.

Further, the optical adjustment sheet according to one aspect of the present invention is an optical adjustment sheet, which is provided with a first surface on which the first light emitted by the first light source is incident and a display device facing the first surface. A second surface on which the second light emitted by the second light source is incident is provided so as to cover the display surface portion included in the display device, and the light in a predetermined wavelength region of the first light and the second light is provided. The second light is light for displaying a moving image on the display surface portion, has a plurality of emission peak wavelengths when incident on the second surface, and has a reflection spectrum of the optical adjustment sheet. The condition is that the reflected peak wavelength is located between two adjacent emission peak wavelengths among the plurality of emission peak wavelengths, and the half-value width of the reflection peak is equal to or less than the difference between the two adjacent emission peak wavelengths. Under one condition, the reflection peak wavelength is located between the shortest emission peak wavelength of the plurality of emission peak wavelengths and 380 nm, and the reflection peak half-value width is equal to or less than the difference between the shortest emission peak wavelength and 380 nm. A certain condition is set as the second condition, the reflection peak wavelength is located between the longest emission peak wavelength of the plurality of emission peak wavelengths and 780 nm, and the reflection peak half-value width is 780 nm with the longest emission peak wavelength. When the condition equal to or less than the difference between the above is set as the third condition, the reflection spectrum satisfies at least one of the first condition, the second condition, and the third condition.

According to the present invention, it is possible to provide a display device or the like that has little influence on the displayed image when it is turned on and can enhance the design of the space when it is turned off.

FIG. 1 is a perspective view showing a usage example of the display device according to the first embodiment. FIG. 2 is an exploded perspective view showing the configuration of the display device according to the first embodiment. FIG. 3 is a cross-sectional view of the optical adjustment sheet according to the first embodiment. FIG. 4 is a diagram showing an emission spectrum of the second light according to the first embodiment. FIG. 5 is a diagram showing a reflection spectrum of the optical adjustment sheet according to the first embodiment. FIG. 6 is a schematic diagram illustrating the behavior of the first light and the second light according to the first embodiment. FIG. 7 is a diagram showing an emission spectrum of the second light for explaining another example of the reflected peak wavelength and the reflected peak half width according to the first embodiment. FIG. 8 is an exploded perspective view showing the configuration of the display device according to the second embodiment. FIG. 9 is an exploded perspective view showing the configuration of the display device according to the first modification of the second embodiment. FIG. 10 is an xy chromaticity diagram showing the reflected peak wavelength and the reflected peak wavelength according to the first modification of the second embodiment. FIG. 11 is an exploded perspective view showing the configuration of the display device according to the second modification of the second embodiment. FIG. 12 is a schematic u'v'chromaticity diagram of the second light according to the modified example 2 and the comparative example of the second embodiment. FIG. 13 is a schematic view showing the configuration of the display device and the projection device according to the third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that all of the embodiments described below show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions of the components, connection forms, and the like shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims are described as arbitrary components.

Note that each figure is a schematic diagram and is not necessarily exactly illustrated. Further, in each figure, substantially the same configuration may be designated by the same reference numerals, and duplicate description may be omitted or simplified.

Further, in the present specification, terms indicating relationships between elements such as uniform, terms indicating the shape of elements such as rectangular or circular, and numerical ranges are not expressions expressing only strict meanings. It is an expression meaning that a substantially equivalent range, for example, a difference of about several percent is included.

(Embodiment 1)
[composition]
First, the configuration of the display device 1 according to the first embodiment will be described with reference to the drawings.

FIG. 1 is a perspective view showing a usage example of the display devices 1, 101 and 201 according to the present embodiment.

As shown in FIG. 1, the display devices 1, 101 and 201 are liquid crystal monitors used in a space such as a house, for example. As an example, the display device 1 displays an image on a user U in a space such as a house as a television (here, an LCD television), the display device 101 is a tablet terminal, and the display device 201 is a monitor provided on an interphone. be.

The display devices 1, 101 and 201 are not limited to the above, and are, for example, a monitor connected to a personal computer, a smartphone terminal, and the like.

Further, the display devices 1, 101 and 201 may be devices used in a space such as a public facility or a commercial facility. Display devices 1, 101 and 201 may be used for advertising as digital signage. Further, the display devices 1, 101 and 201 are used indoors as shown in FIG. 1, but the present invention is not limited to this, and the display devices 1, 101 and 201 may be used outdoors.

The display devices 1, 101 and 201 are illuminated by the first light L10 emitted by the first light source 300 provided outside the display devices 1, 101 and 201. As shown in FIG. 1, the first light source 300 is a light source included in a lighting fixture located in the space where the display devices 1, 101 and 201 are installed. The first light L10 may be light of any color as long as it illuminates the space, but here, it is white light. The first light L10 is not limited to this, and may be light bulb-colored light.

Further, the first light source 300 may be, for example, the sun. In this case, the first light L10 is sunlight shining through a window or the like.

Below, the display device 1 will be described as a typical example.

FIG. 2 is an exploded perspective view showing the configuration of the display device 1 according to the present embodiment.

The display device 1 includes a display surface portion 2 and an optical adjustment sheet 10.

In the present embodiment, the display surface portion 2 is a liquid crystal panel. The display surface portion 2 emits a second light L20 for displaying an image. That is, the second light L20 is light emitted from a plurality of pixels of the display surface portion 2. As a result, an image including a still image and a moving image is displayed on the display surface unit 2 (more specifically, on the display surface of the display surface unit 2). Further, the second light L20 is light derived from the light emitted by the second light source of the display surface portion 2. The second light source (not shown) is a light source provided in the display device 1.

In the present embodiment, the second light source is, for example, an LED module having a light emitting diode (LED; Light Emitting Diode). The second light source is not limited to the above as long as it can emit visible light.

The second light source can emit white light as an example. More specifically, the second light source includes a blue LED that emits blue light and a sealing member containing a phosphor. The phosphor includes a green phosphor and a red phosphor that fluoresce using the blue light emitted by the blue LED as excitation light. The green phosphor and the red phosphor absorb a part of the blue light emitted by the blue LED and are excited to emit green light and red light, which are absorbed by the green light and red light and the green phosphor and the red phosphor. It becomes white light by mixing with the blue light that was not there. In addition, the fluorophore may include a yellow fluorophore that emits yellow light.

Further, in the present embodiment, the second light source is the white backlight of the display device 1 which is a liquid crystal monitor. The second light source is used in the display device 1 by an edge type or a direct type backlight type. For example, in the case of the edge type, the second light source has a COB (Chip On Board) structure or a surface mount (SMD: Surface Mount Device) structure, and in the case of the direct type, the second light source has an SMD structure. Not limited to this.

The white light emitted by the second light source is converted into the second light L20 including blue light, green light and red light by passing through the color filter included in the display device 1, and the blue light contained in the second light L20, for example. By controlling the amount of green light and red light, the image is displayed on the display surface portion 2. The blue light, green light, and red light are emitted from, for example, a plurality of sub-pixels included in the plurality of pixels. Further, as shown in FIG. 2, the second light L20 including blue light, green light, and red light is incident on the optical adjustment sheet 10 provided so as to cover the display surface portion 2.

The optical adjustment sheet 10 has a first surface 11 and a second surface 12 that faces the first surface 11. The first light L10 is incident on the first surface 11, and the second light L20 is incident on the second surface 12. The optical adjustment sheet 10 reflects light in a predetermined wavelength region of the first light L10 and the second light L20.

The optical adjustment sheet 10 is a sheet-shaped optical member. The optical adjustment sheet 10 may be a rigid seat member having no flexibility, or a flexible seat member having flexibility. In the present embodiment, the optical adjustment sheet 10 has a rectangular shape in a plan view.

In the present embodiment, the optical adjustment sheet 10 is provided so as to cover the entire surface of the display surface portion 2 (more specifically, the entire surface of the display surface of the display surface portion 2). Therefore, to the user U, it seems that the color presented by the optical adjustment sheet 10 is the color presented by the display surface portion 2. The optical adjustment sheet 10 is not limited to the above, and may be provided so as to cover a part of the display surface portion 2.

Here, the optical adjustment sheet 10 will be described in more detail with reference to FIG.

FIG. 3 is a cross-sectional view of the optical adjustment sheet 10 according to the present embodiment.

In the present embodiment, the optical adjustment sheet 10 has a base material 20 and a colloidal crystal film 30.

The base material 20 is an optical member having translucency at least in the visible light region. That is, the base material 20 has a light property of transmitting visible light. The transmittance of the base material 20 is preferably high, and is preferably at least 50% or more. Specifically, the base material 20 is preferably transparent to visible light. The transparent base material 20 has a high transmittance so that the other side can be seen through. In this case, the transmittance of the transparent base material 20 with respect to visible light is 70% or more, better if it is 80% or more, and even better if it is 90% or more.

The base material 20 is made of a translucent material. The base material 20 is a transparent substrate that is transparent to visible light, such as a transparent resin substrate made of a transparent resin material or a glass substrate made of a transparent glass material. As the transparent resin substrate, an acrylic substrate made of an acrylic resin or a polycarbonate substrate made of a polycarbonate resin can be used. The transparent resin substrate may be a rigid substrate having no flexibility or a flexible substrate having flexibility. In this embodiment, a rigid and transparent acrylic substrate is used as the base material 20.

The plan view shape of the base material 20 is rectangular like the optical adjustment sheet 10. The thickness of the base material 20 is, for example, several mm or more and several cm or less, but is not limited to this. In the present embodiment, the base material 20 functions as a substrate that supports the colloidal crystal film 30 included in the optical adjustment sheet 10.

In the present embodiment, the colloidal crystal film 30 is provided on one main surface of the base material 20. Specifically, the colloidal crystal film 30 is formed on the entire surface of one main surface of the base material 20 so as to be in contact with one main surface. The thickness of the colloidal crystal film 30 is uniform throughout the colloidal crystal film 30. That is, the thickness of the colloidal crystal film 30 is constant. The thickness of the colloidal crystal film 30 is preferably 5 μm or more and 100 μm or less, but is not limited to this.

Specifically, the colloidal crystal film 30 has a three-dimensional periodic structure which is a three-dimensional periodic structure. As shown in FIG. 3, the colloidal crystal film 30 is composed of a plurality of nanoparticles 32 and a parent resin 31 that holds the plurality of nanoparticles 32. In the present embodiment, the plurality of nanoparticles 32 (colloidal particles) are three-dimensionally and periodically and regularly arranged, and exist as colloidal crystals in the parent resin 31. Specifically, the plurality of nanoparticles 32 are periodically and regularly arranged in the three axial directions of the thickness direction of the base material 20 and the biaxial direction (horizontal direction) parallel to one main surface of the base material 20. It is a colloidal crystal. The plurality of nanoparticles 32 are uniformly arranged throughout the colloidal crystal film 30.

Nanoparticle 32 is a particle having a particle size of submicron order size. In the present embodiment, the particle sizes of the nanoparticles 32 contained in the colloidal crystal film 30 are basically the same, but may vary slightly. Although the details will be described later, the wavelength region of the light reflected by the optical adjustment sheet 10 having the colloidal crystal film 30 by adjusting the average particle size and / or the concentration of 12a of the plurality of nanoparticles contained in the colloidal crystal film 30. Can be changed.

The plurality of nanoparticles 32 are, for example, translucent particles that transmit light. As the nanoparticles 32 which are translucent particles, for example, _{inorganic particles such as silica particles made of SiO 2} may be used, or polymer particles such as polystyrene particles or acrylic particles may be used. In this embodiment, silica particles are used as nanoparticles 32.

The base resin 31 is a binder that fixes a plurality of nanoparticles 32. The base resin 31 is made of a translucent resin material. In the present embodiment, the base resin 31 is made of a resin material that is transparent to visible light. The base resin 31 may contain at least one selected from the group consisting of, for example, an acrylic resin, a polycarbonate resin, a cycloolefin resin, an epoxy resin, a silicone resin, a styrene resin, and the like.

The colloidal crystal film 30 can be produced, for example, as follows.

First, silica particles are added to a monomer made of triethylene glycol dimethacrylate (for example, "NK ester 3G" manufactured by Shin-Nakamura Chemical Industry Co., Ltd.) so that the content is 40%. After that, ultrasonic dispersion treatment was performed to disperse the silica particles in the monomer so as to be regularly arranged in three dimensions. In this way, a dispersion liquid in which the silica particles are uniformly dispersed in the monomer as colloidal particles is obtained. Next, 1.0% by weight of a photopolymerization initiator (for example, IRGACURE-1173 manufactured by IGM Resins BV) is added to this dispersion. Then, this dispersion is applied to the base material 20 using a bar coater to form a coating film. At this time, it is preferable to use a bar coater having a count of # 10. Then, the colloidal crystal film 30 can be produced on the surface of the base material 20 by irradiating the obtained coating film with ultraviolet light to polymerize the monomers.

The colloidal crystal film 30 thus produced has a different color when viewed in a plan view depending on the particle size of the plurality of nanoparticles 32 constituting the colloidal crystal. For example, the colloidal crystal film 30 produced by the above method using silica particles having an average particle diameter of 180 nm as nanoparticles 32 has a yellow color in a plan view. Further, the colloidal crystal film 30 produced by the above method using silica particles having an average particle diameter of 200 nm as nanoparticles 32 has a red color in a plan view. In this embodiment, silica particles having an average particle diameter of 180 nm are used.

The optical adjustment sheet 10 may include, for example, a dielectric multilayer film instead of the colloidal crystal film 30. The dielectric multilayer film has a structure in which a plurality of dielectric materials having different dielectric constants are laminated. For example, the dielectric multilayer film has a structure in which a dielectric film having a low refractive index and a dielectric film having a high refractive index are alternately laminated. In such a dielectric multilayer film, the light reflected at the interface between the dielectric film having a low refractive index and the dielectric film having a high refractive index matches the phase of the light reciprocating in the dielectric multilayer film, and each light is matched. By strengthening each other in the same reflection direction, a film having a high refractive index with respect to light in a predetermined wavelength region is obtained. More specifically, a reflection spectrum having a narrow bandwidth reflection peak is realized.

Further, in the present embodiment, the base material 20 is in contact with the display surface portion 2 (more specifically, the display surface of the display surface portion 2), but the present invention is not limited to this, and the colloidal crystal film 30 is in contact with the display surface portion 2. You may. Further, an adhesive layer may be provided between the optical adjustment sheet 10 and the display surface portion 2, but in the present embodiment, the adhesive layer is not provided. The adhesive layer is preferably a light-transmitting layer. The transmittance of the adhesive layer is preferably high, and is preferably at least 50% or more. Specifically, the transmittance of the adhesive layer with respect to visible light is 70% or more, better if it is 80% or more, and even better if it is 90% or more.

[Light behavior]
Next, the behavior of the first light L10 and the second light L20 according to the present embodiment will be described with reference to FIGS. 4 to 6. First, the details of the emission spectrum of the second light L20 will be described with reference to FIG.

FIG. 4 is a diagram showing an emission spectrum of the second light L20 according to the present embodiment. More specifically, FIG. 4 is a diagram showing the emission spectra of blue light, green light, and red light emitted from a plurality of subpixels, which is the light contained in the second light L20. In FIG. 4, the emission spectra of blue light, green light, and red light are described by solid lines, broken lines, and alternate long and short dash lines, respectively. In addition, each emission spectrum is standardized by the intensity of the peak wavelength of blue light.

The second light L20 has a plurality of emission peak wavelengths including the first emission peak wavelength λ1, the second emission peak wavelength λ2, and the third emission peak wavelength λ3 in the visible light region. The first, second, and third emission peak wavelengths λ1, λ2, and λ3 in FIG. 4 correspond to the peak wavelengths of the emission spectra of blue light, green light, and red light emitted from the plurality of subpixels. The second emission peak wavelength λ2 is adjacent to the first emission peak wavelength λ1 and is longer than the first emission peak wavelength λ1. The third emission peak wavelength λ3 is adjacent to the second emission peak wavelength λ2 and is longer than the second emission peak wavelength λ2.

Next, the reflection spectrum of the optical adjustment sheet 10 will be described with reference to FIG.

FIG. 5 is a diagram showing a reflection spectrum of the optical adjustment sheet 10 according to the present embodiment. The reflection spectrum shown in FIG. 5 was measured by measuring the reflection spectrum with an incident angle of 5 °. The reflection spectrum was measured with the measurement option ARMV-734 using a spectrophotometer (V-650) manufactured by JASCO Corporation.

Prior studies by the inventors have revealed that the optical adjustment sheet 10 including the colloidal crystal film 30 has a reflection wavelength selectivity in which the wavelength of the reflected light depends on the incident angle of the incident light.

As shown in FIG. 5, when the incident angle is 5 °, the reflection peak wavelength λr is about 570 nm. It is considered that the reflection peak wavelength λr at the specular reflection wavelength (incident angle is 0 °) of the optical adjustment sheet 10 exists in the range of 570 nm or more and 580 nm or less. The half-value width at half maximum of the reflection peak is about 20 nm. The half-value width at half maximum of the reflection peak is the width of the wavelength at which the reflectance at the reflection peak wavelength λr corrected at the baseline of the reflection spectrum becomes 50%.

In the present embodiment, the reflection peak is the peak having the highest reflectance, and the reflection peak wavelength λr is the wavelength at which the transmittance is maximum. As shown in FIG. 5, the reflection spectrum of one optical adjustment sheet 10 has one reflection peak.

From the above, in the reflection spectrum of the optical adjustment sheet 10, the reflection peak wavelength λr and the reflection peak half width w satisfy the following first conditions.

The first condition is that the reflection peak wavelength λr is located between two adjacent emission peak wavelengths among the plurality of emission peak wavelengths, and the reflection peak half width w is equal to or less than the difference between the two adjacent emission peak wavelengths. It is a certain condition. Specifically, as shown in FIG. 5, the reflected peak wavelength λr is the two adjacent peak wavelengths (the second emission peak wavelength λ2 corresponding to green light and the third emission peak wavelength λ3 corresponding to red light). It is located between. Further, the full width at half maximum of the reflected peak is equal to or less than the difference between the second emission peak wavelength λ2 corresponding to green light and the third emission peak wavelength λ3 corresponding to red light.

The reflectance at the reflection peak wavelength λr is about 38%, but the reflectance is not limited to this, and may be 20% or more and 60% or less. The reflectance at the reflection peak wavelength λr is better if it is 25% or more and 55% or less, and even better if it is 30% or more and 50% or less.

Further, in the present embodiment, the optical adjustment sheet 10 includes the colloidal crystal film 30. Therefore, a reflection spectrum having a narrow bandwidth reflection peak is realized. Further, by adjusting the average particle diameter and / or concentration of 12a of the plurality of nanoparticles, the wavelength region of the light reflected by the optical adjustment sheet 10 having the colloidal crystal film 30 can be changed. Further, since the base material 20, the plurality of nanoparticles 32, and the base resin 31 all have translucency, the optical adjustment sheet 10 also has translucency in the visible light region, and light absorption is unlikely to occur.

Subsequently, the behavior of the first light L10 and the second light L20 incident on the optical adjustment sheet 10 will be described with reference to FIG.

FIG. 6 is a schematic diagram illustrating the behavior of the first light L10 and the second light L20 according to the present embodiment.

As shown in FIG. 6, the first light L10 is incident on the first surface 11 and the second light L20 is incident on the second surface 12. Further, the optical adjustment sheet 10 reflects light in a predetermined wavelength region of the first light L10 and the second light L20. In other words, of the first light L10 and the second light L20, light other than the light in the predetermined wavelength region passes through the optical adjustment sheet 10.

The first light L10 and the second light L20 reflected by the optical adjustment sheet 10 are the first reflected light L11 and the second reflected light L21, and the first light L10 and the second light L20 transmitted through the optical adjustment sheet 10 are the first. Let the transmitted light L12 and the second transmitted light L22. The first reflected light L11 and the second transmitted light L22 are light emitted toward the space where the display device 1 is installed and the user U, and the first transmitted light L12 and the second reflected light L21 are displayed. It is the light emitted toward the surface portion 2.

Here, the influence of the first light L10 and the second light L20 on the user U will be described. As described above, in the present embodiment, the color presented by the optical adjustment sheet 10 appears to the user U as if it is the color presented by the display surface portion 2.

First, when the display device 1 is turned off, that is, when the display surface portion 2 does not emit the second light L20 (hereinafter, referred to as when the light is turned off), the color exhibited by the optical adjustment sheet 10 is mainly the first reflection. It is the color of light L11. In the present embodiment, since the first light L10 is white light and the reflection spectrum of the optical adjustment sheet 10 satisfies the first condition, the first reflected light L11 is colored light in the visible light region. .. More specifically, since the reflected peak wavelength λr is 570 nm or more and 580 nm or less, the first reflected light L11 is yellow light.

Therefore, for the user U, the color presented by the display surface portion 2 is visually recognized as a colored color (for example, yellow) other than the conventional black color, and the display device 1 is easily adapted to the interior or exterior of the space. Therefore, the display device 1 can enhance the design of the space.

Next, when the display device 1 is lit, that is, when the display surface portion 2 emits the second light L20 (hereinafter, referred to as lit), the color exhibited by the optical adjustment sheet 10 is mainly the second. This is the color of the transmitted light L22.

As described above, the reflection spectrum of the optical adjustment sheet 10 satisfies the first condition. Therefore, the optical adjustment sheet 10 does not easily reflect the light having the second emission peak wavelength λ2 and the third emission peak wavelength λ3 having high emission intensity, so that the amount of the second reflected light L21 is small, that is, the second transmitted light L22. There is a lot of light. That is, since the second light L20 for displaying the image on the display surface portion 2 is hard to be shielded by the optical adjustment sheet 10 (because it is hard to be reflected), the visibility of the image is hard to be deteriorated. Therefore, in the display device 1, the influence on the displayed image is small.

Summarizing the above, a display device 1 that has little effect on the displayed image when it is lit and can enhance the design of the space when it is extinguished is realized.

Further, in the present embodiment, the colloidal crystal film 30 is used to realize a reflection spectrum having a narrow bandwidth reflection peak. Therefore, since the amount of light of the second transmitted light L22 can be increased, the visibility of the image is less likely to be lowered.

Further, as described above, the optical adjustment sheet 10 may include, for example, a dielectric multilayer film instead of the colloidal crystal film 30. Also in this case, a reflection spectrum having a narrow bandwidth reflection peak is realized. Therefore, since the amount of light of the second transmitted light L22 can be increased, the visibility of the image is less likely to be lowered.

The reflection peak wavelength λr and the reflection peak full width at half maximum w in the reflection spectrum of the optical adjustment sheet 10 are not limited to the above.

For example, the reflection peak wavelength λr is located between the shortest emission peak wavelength of the plurality of emission peak wavelengths and 380 nm, and the reflection peak half width w is less than or equal to the difference between the shortest emission peak wavelength and 380 nm. It may be good (hereinafter referred to as the second condition). As an example, the reflection peak wavelength λr may be located between the first emission peak wavelength λ1 and 380 nm, and may be equal to or less than the difference between the first emission peak wavelength λ1 and 380 nm.

Further, for example, the reflection peak wavelength λr is located between the longest emission peak wavelength of the plurality of emission peak wavelengths and 780 nm, and the reflection peak half width w is less than or equal to the difference between the longest emission peak wavelength and 780 nm. It may be (hereinafter referred to as the third condition). As an example, the reflection peak wavelength λr may be located between the third emission peak wavelength λ3 and 780 nm, and the reflection peak full width at half maximum w may be equal to or less than the difference between the third emission peak wavelength λ3 and 780 nm.

The reflection spectrum of the optical adjustment sheet 10 satisfies at least one of the first condition, the second condition and the third condition.

That is, in the present embodiment, the reflection peak of the optical adjustment sheet 10 is designed so as to be less overlapped with each of the blue light, the green light, and the red light emitted from the sub-pixels on the display surface portion 2.

As a result, for the user U, the color presented by the display surface portion 2 is visually recognized as a color other than the conventional black color, and the display device 1 is easily adapted to the interior or exterior of the space. Further, since the second light L20 for displaying the image on the display surface portion 2 is hard to be shielded by the optical adjustment sheet 10, the visibility of the image is hard to be deteriorated. That is, the display device 1 is realized, which has little influence on the displayed image when it is lit and can enhance the design of the space when it is extinguished.

Further, for example, the reflection peak wavelength λr and the reflection peak full width at half maximum w in the reflection spectrum of the optical adjustment sheet 10 may be as follows.

FIG. 7 is a diagram showing an emission spectrum of the second light L20 for explaining another example of the reflection peak wavelength λr and the reflection peak half width w according to the present embodiment.

Here, the first and second emission peak wavelengths λ1 and λ2 corresponding to the peak wavelengths of the emission spectra of blue light and green light will be described. Further, also in the second and third emission peak wavelengths λ2 and λ3, the reflection peak wavelength λr and the reflection peak full width at half maximum w may be determined by using the same conditions.

First, let X be the difference between the first emission peak wavelength λ1 and the second emission peak wavelength λ2, and let λm be an intermediate wavelength between the first emission peak wavelength λ1 and the second emission peak wavelength λ2. That is, λm is a value obtained by adding the first emission peak wavelength λ1 and the second emission peak wavelength λ2 and dividing by two. At this time, the reflection peak wavelength λr may satisfy the following equation (1), and the reflection peak full width at half maximum w may satisfy the following equation (2).

(1) λm−a × (X / 2) ≦ λr ≦ λm + a × (X / 2)
(2) w = b × X

A and b are real numbers, and a may be 0.9 or less, better if it is 0.6 or less, and even better if it is 0.3 or less. Further, b may be 0.1 or more and 0.9 or less, 0.2 or more and 0.8 or less, and 0.3 or more and 0.7 or less.

The smaller a is, the more difficult it is for the reflection peak wavelength λr to overlap with the first emission peak wavelength λ1 and the second emission peak wavelength λ2, and the smaller b is, the more a reflection spectrum having a narrow bandwidth reflection peak is realized. Therefore, the amount of light of the second transmitted light L22 can be increased.

On the other hand, the larger b is, the easier it is to manufacture the optical adjustment sheet 10. For example, when the optical adjustment sheet 10 includes the colloidal crystal film 30, it becomes easy to allow the periodic arrangement of the plurality of nanoparticles 32 to be disturbed.

Therefore, when a and b are in the above range, the display device 1 is easily adapted to the interior or exterior of the space, the visibility of the image is not easily deteriorated, and the manufacturing is easy.

Further, the second light source has a light emitting diode, but is not limited to this, and may have a light emitter, a cold cathode tube, a light emitting diode, or a laser diode using cathodoluminescence or plasma discharge. As a result, in the display device 1 provided with the second light source, the influence on the displayed image is small when the light is turned on, and the design of the space can be improved when the light is turned off.

(Embodiment 2)
Next, the display device 1a according to the second embodiment will be described with reference to FIG. FIG. 8 is an exploded perspective view showing the configuration of the display device 1a according to the present embodiment.

The second embodiment is different from the first embodiment in that a plurality of optical adjustment sheets are provided.

Specifically, the display device 1a has the same configuration as the display device 1 according to the first embodiment, except that the display device 1a includes the first optical adjustment sheet 10a and the second optical adjustment sheet 10b as a plurality of optical adjustment sheets. Be prepared.

The first optical adjustment sheet 10a has the same configuration as the optical adjustment sheet 10 according to the first embodiment. The second optical adjustment sheet 10b has the same configuration as the optical adjustment sheet 10 according to the first embodiment, except that the average particle diameter of the nanoparticles 32 contained in the colloidal crystal film 30 in the second optical adjustment sheet 10b is different. Here, since the particle diameters of the colloidal crystal film 30 are different from each other, the reflection peak wavelength of the reflection spectrum of the first optical adjustment sheet 10a and the reflection peak wavelength of the reflection spectrum of the second optical adjustment sheet 10b are different. In the present embodiment, the particle size of the nanoparticles 32 is 160 nm in the colloidal crystal film 30 included in the second optical adjustment sheet 10b. At this time, the reflection peak wavelength of the reflection spectrum of the second optical adjustment sheet 10b is 475 nm or more and 485 nm or less.

In the present embodiment, the reflection peak wavelength and the reflection peak full width at half maximum in the reflection spectrum of the first optical adjustment sheet 10a, which is one of the plurality of optical adjustment sheets, and the second optical adjustment sheet 10b, which is the other one. Is as follows. In the first optical adjustment sheet 10a, the reflection peak wavelength is located between the second emission peak wavelength and the third emission peak wavelength, and the half width of the reflection peak is the second emission peak wavelength and the third emission peak wavelength. Is less than or equal to the difference of. Further, in the second optical adjustment sheet 10b, the reflection peak wavelength is located between the first emission peak wavelength and the second emission peak wavelength, and the half width of the reflection peak is the first emission peak wavelength and the second emission peak. It is less than or equal to the difference from the wavelength.

Further, in FIG. 8, the light corresponding to the first reflected light L11 of the first embodiment is described as the first reflected light L11a and 11b. The first light L10 reflected by the first optical adjustment sheet 10a is the first reflected light L11a, and the first light L10 reflected by the second optical adjustment sheet 10b is the first reflected light L11b.

As shown in FIG. 8, in the present embodiment, the first and second optical adjustment sheets 10a and 10b) are arranged so as not to overlap in a plan view. The first optical adjustment sheet 10a is provided so as to cover a part of the display surface portion 2, and the second optical adjustment sheet 10b is provided so as to cover the other portion of the display surface portion 2. That is, in the present embodiment, for the user U, the color exhibited by the first optical adjustment sheet 10a is the color exhibited by a part of the display surface portion 2, and the color exhibited by the second optical adjustment sheet 10b is the color exhibited by the display surface portion 2. It looks as if it is the color exhibited by other parts.

For example, the color exhibited by the first optical adjustment sheet 10a when the light is turned off is mainly the color of the first reflected light L11a. More specifically, the first reflected light L11a is yellow light as in the first embodiment. The color exhibited by the second optical adjustment sheet 10b is mainly the color of the first reflected light L11b. More specifically, since the reflection peak wavelength of the reflection spectrum of the second optical adjustment sheet 10b is 475 nm or more and 485 nm or less, the first reflected light L11b is blue light.

Therefore, as compared with the first embodiment, the colors presented by the display surface portion 2 appear to the user U as if they are more diverse colors. Therefore, since the display device 1a is more familiar to the interior or exterior of the space, the display device 1a can further enhance the design of the space.

Further, for example, by drawing a pattern with the first optical adjustment sheet 10a and the second optical adjustment sheet 10b, the display device 1a is more familiar to the interior or exterior of the space.

(Modification 1 of Embodiment 2)
Next, the display device 1b according to the first modification of the second embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is an exploded perspective view showing the configuration of the display device 1b according to the first modification of the present embodiment.

The first modification of the second embodiment is different from the second embodiment in that a plurality of optical adjustment sheets are laminated.

Specifically, the display device 1b has the same configuration as the display device 1a according to the second embodiment, but as shown in FIG. 9, in the present embodiment, a plurality of optical adjustment sheets (first and first) 2 The optical adjustment sheets 10a and 10b) are laminated.

The second optical adjustment sheet 10b is provided so as to cover the entire surface of the display surface portion 2, and the first optical adjustment sheet 10a is provided so as to cover the entire surface of the second optical adjustment sheet 10b. That is, in the present modification, to the user U, it seems that the color exhibited by the first optical adjustment sheet 10a and the second optical adjustment sheet 10b is the color exhibited by the display surface portion 2.

For example, when the light is turned off, the colors exhibited by the first optical adjustment sheet 10a and the second optical adjustment sheet 10b are mainly colors in which the first reflected light L11a (yellow light) and the first reflected light L11b (blue light) are combined. Is.

The second optical adjustment sheet 10b is arranged on the display surface portion 2 side of the first optical adjustment sheet 10a, but the present invention is not limited to this, and the first optical adjustment sheet 10a is located on the display surface portion of the second optical adjustment sheet 10b. It may be arranged on two sides.

Here, the colors exhibited by the first optical adjustment sheet 10a and the second optical adjustment sheet 10b will be described in more detail. Further, the reflection peak wavelength of the reflection spectrum of the first optical adjustment sheet 10a is λr1, and the reflection peak wavelength of the reflection spectrum of the second optical adjustment sheet 10b is λr2.

FIG. 10 is an xy chromaticity diagram showing the reflected peak wavelength λr1 and the reflected peak wavelength λr2 according to the first modification of the present embodiment. The region A shown in the xy chromaticity diagram indicates a white region.

As described above, the first reflected light L11a is yellow light corresponding to the reflected peak wavelength λr1 (570 nm or more and 580 nm or less), and the first reflected light L11b is blue corresponding to the reflected peak wavelength λr2 (475 nm or more and 485 nm or less). It is light. The colors of the two lights are approximately in the positional relationship of complementary colors. Therefore, when the light is turned off, the colors exhibited by the first optical adjustment sheet 10a and the second optical adjustment sheet 10b can be within the range of the region A, that is, within the range of white light.

Therefore, for the user U, the color presented by the display surface portion 2 is not the conventional black color, but is visually recognized as a composite color (for example, white) of the first reflected light L11a and the first reflected light L11b, and the display device 1 is a space. Easy to get used to the interior or exterior of. Further, as compared with the case where one optical adjustment sheet 10 as shown in the first embodiment is provided, the degree of freedom in designing the color presented by the display surface portion 2 is improved. Therefore, the display device 1b can enhance the design of the space.

(Modification 2 of Embodiment 2)
Next, the display device 1c according to the second modification of the second embodiment will be described with reference to FIGS. 11 and 12. FIG. 11 is an exploded perspective view showing the configuration of the display device 1c according to the second modification of the present embodiment.

The modification of the second embodiment, except that the display device 1c according to the present modification includes four optical adjustment sheets including the first, second, third, and fourth optical adjustment sheets 10a, 10b, 10c, and 10d. It has the same configuration as the display device 1b according to Example 2.

In the display device 1c according to this modification, the four optical adjustment sheets are laminated in the order of the first, second, third, and fourth optical adjustment sheets. Further, the fourth optical adjustment sheet 10d is provided so as to cover the entire surface of the display surface portion 2, and the third optical adjustment sheet 10c is provided so as to cover the entire surface of the fourth optical adjustment sheet 10d. Further, the second optical adjustment sheet 10b is provided so as to cover the entire surface of the third optical adjustment sheet 10c, and the first optical adjustment sheet 10a covers the entire surface of the second optical adjustment sheet 10b. That is, in this modification, for the user U, it is as if the colors exhibited by the first, second, third, and fourth optical adjustment sheets 10a, 10b, 10c, and 10d are the colors exhibited by the display surface portion 2. Looks like. For example, when the lights are turned off, the colors exhibited by the first, second, third, and fourth optical adjustment sheets 10a, 10b, 10c, and 10d are mainly the first, second, third, and fourth optical adjustment sheets 10a, 10b. The color of the first light L10 reflected by each of 10c and 10d is a composite color.

The reflection peak wavelength and the reflection peak half width in the reflection spectrum of the third optical adjustment sheet 10c satisfy the second condition. The reflection peak wavelength and the reflection peak full width at half maximum in the reflection spectrum of the fourth optical adjustment sheet 10d satisfy the above-mentioned third condition.

Further, the display device according to the comparative example has the same configuration as the display device 1 according to the first embodiment except that the optical adjustment sheet 10 is not provided.

Here, the second light according to the present modification and the comparative example will be described with reference to FIG. FIG. 12 is a schematic u'v'chromaticity diagram of the second light according to the present modification and the comparative example.

In FIG. 12, the emission spectrum of the second light L20 transmitted through the four optical adjustment sheets in the present modification is in the broken line frame, and the emission spectrum of the second light emitted from the display surface in the comparative example is in the alternate long and short dash line frame. Shown in.

The emission spectra of the second light according to the present modification and the comparative example both have emission spectra of blue light, green light, and red light.

In this modification, since the first, second, third, and fourth optical adjustment sheets 10a, 10b, 10c, and 10d satisfy the above conditions, light in a predetermined wavelength region of the second light L20 is reflected. NS. Therefore, when the emission spectra of the second light according to the present modification and the comparative example are compared, the emission spectrum of the second light L20 according to the present modification, which is broader than the emission spectrum of the second light according to the comparative example, is sharper. It has an emission spectrum. That is, the emission spectrum of the second light L20 according to this modification has an emission spectrum of blue light, green light, and red light, which is closer to monochromatic light.

Further, in the u'v'chromaticity diagram shown in FIG. 12, the chromaticity based on the blue light, green light, and red light possessed by the emission spectrum of the second light according to the present modification and the comparative example is shown. ..

As shown in FIG. 12, the second light L20 according to the present modification has a wider color gamut than the second light according to the comparative example. As described above, the emission spectrum of the second light L20 according to this modification has an emission spectrum closer to that of monochromatic light. Therefore, in this modification, the color gamut can be expanded as compared with the comparative example, that is, the range of colors expressed by the second light L20 can be expanded.

(Embodiment 3)
Next, the display device 1 according to the third embodiment will be described with reference to FIG. FIG. 13 is a schematic view showing the configuration of the display device 1 and the projection device 400 according to the present embodiment.

The third embodiment is different from the first embodiment in that the first light source is the light source included in the projection device 400.

The projection device 400 is a projector, but the present invention is not limited to this, and may be, for example, a floodlight. The projection device 400 is a device that projects an image onto the optical adjustment sheet 10 included in the display device 1. More specifically, the first light L10 emitted by the first light source included in the projection device 400 is light that projects an image (hereinafter, first image). In this case, the optical adjustment sheet 10 can be said to be a screen for the projection device 400.

In the present embodiment, the first image projected by the first light L10 is different from the image displayed by the second light L20 emitted by the display surface portion 2 (hereinafter referred to as the second image), but is the same. You may. Specifically, the first image is an image that highlights the second image so as to stand out toward a circle surrounded by a broken line shown in the second image.

Further, in FIG. 13, the first image is projected only on a part of the optical adjustment sheet 10 (that is, in the circle surrounded by the broken line), but the first image is projected on the entire optical adjustment sheet 10. May be good. For example, when the first image is the same as the second image and is projected on the entire optical adjustment sheet 10, that is, when the images are superimposed, the second image can be made more conspicuous. Further, in this case, the light (yellow light) in the wavelength region reflected by the optical adjustment sheet 10 in the second light L20 is not visually recognized by the user U, but is in the wavelength region reflected by the optical adjustment sheet 10 in the first light L10. The light (yellow light) is visually recognized by the user U. That is, since the light (yellow light) in the wavelength region lacking in the second image can be supplemented by the first image, the second image can be expressed more vividly.

Summarizing the above, in the display device 1c according to the present embodiment, it is possible to make the second image displayed by the second light L20 more conspicuous. That is, the eye-catching effect of the display device 1 can be enhanced.

(Other embodiments)
Although the display device and the like according to the present invention have been described above based on each embodiment, the present invention is not limited to each of these embodiments. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the embodiments, and other embodiments constructed by combining some components in the respective embodiments are also within the scope of the present invention. include.

For example, the second light source may have a light emitting diode that emits blue light, a light emitting diode that emits green light, and a light emitting diode that emits red light. Also in this case, the second light L20 is light including blue light, green light, and red light. In this case, the display device may or may not have a color filter.

Further, in each of the above embodiments, one optical adjustment sheet has one colloidal crystal film, but the present invention is not limited to this. For example, one optical adjustment sheet may have a plurality of laminated colloidal crystal films. In this case, one optical adjustment sheet may have as many reflection peaks as there are colloidal crystal films.

In the above embodiment, the second light L20 includes light of three colors, that is, has three emission peaks in the emission spectrum, but is not limited to this. For example, the second light L20 may include light of four or more colors, that is, may have four or more emission peaks in the emission spectrum.

Further, the display devices 1, 101 and 201 are not limited to the liquid crystal monitor. It may be a cathode ray tube monitor, a plasma monitor, an organic EL monitor, or the like. Further, as the phosphor, a quantum dot semiconductor exhibiting fluorescence may be used.

Further, in the above embodiment, various changes, replacements, additions, omissions, etc. can be made within the claims or the equivalent range thereof.

1 Display device 2 Display surface 10 Optical adjustment sheet 11 1st surface 12 2nd surface 30 Colloidal crystal film 300 1st light source L10 1st light L20 2nd light w Reflection peak half width λ1 1st emission peak Wavelength λ2 2nd emission peak Wavelength λ3 Third emission peak wavelength λr Reflection peak wavelength

Claims (9)

A display device illuminated by the first light emitted by the first light source.
A display surface that emits a second light to display an image,
It is provided so as to cover the display surface portion, and has a first surface on which the first light is incident and a second surface on which the second light is incident, facing back to the first surface, and the first light and the first surface. An optical adjustment sheet that reflects light in a predetermined wavelength region out of two lights,
With
The second light has a plurality of emission peak wavelengths and has a plurality of emission peak wavelengths.
In the reflection spectrum of the optical adjustment sheet,
The first condition is that the reflected peak wavelength is located between two adjacent emission peak wavelengths among the plurality of emission peak wavelengths, and the half width of the reflection peak is equal to or less than the difference between the two adjacent emission peak wavelengths. year,
The condition that the reflection peak wavelength is located between the shortest emission peak wavelength of the plurality of emission peak wavelengths and 380 nm and the half width of the reflection peak is equal to or less than the difference between the shortest emission peak wavelength and 380 nm is the first condition. 2 conditions
The condition that the reflection peak wavelength is located between the longest emission peak wavelength of the plurality of emission peak wavelengths and 780 nm and the half width of the reflection peak is equal to or less than the difference between the longest emission peak wavelength and 780 nm is the first condition. When there are 3 conditions
A display device in which the reflection spectrum satisfies at least one of the first condition, the second condition, and the third condition. With a plurality of the above-mentioned optical adjustment sheets,
The display device according to claim 1, wherein the reflected peak wavelength in each of the plurality of optical adjustment sheets is different. The plurality of emission peak wavelengths include a first emission peak wavelength, a second emission peak wavelength adjacent to the first emission peak wavelength and a wavelength longer than the first emission peak wavelength, and the second emission peak wavelength. Adjacent to each other, the third emission peak wavelength, which is a wavelength longer than the second emission peak wavelength, is included.
In the reflection spectrum of one of the plurality of optical adjustment sheets, the reflection peak wavelength is located between the first emission peak wavelength and the second emission peak wavelength, and the reflection peak half The value range is equal to or less than the difference between the first emission peak wavelength and the second emission peak wavelength.
In the reflection spectrum of the other optical adjustment sheet of the plurality of optical adjustment sheets, the reflection peak wavelength is located between the second emission peak wavelength and the third emission peak wavelength, and the reflection peak wavelength is located. The display device according to claim 2, wherein the reflection peak half width is equal to or less than the difference between the second emission peak wavelength and the third emission peak wavelength. The display device according to claim 2 or 3, wherein the plurality of optical adjustment sheets are laminated. The display device according to any one of claims 1 to 4, wherein the optical adjustment sheet has a colloidal crystal film. The display device according to any one of claims 1 to 5, wherein the optical adjustment sheet has a dielectric multilayer film. The display according to any one of claims 1 to 6, wherein the second light source included in the display surface portion includes a light emitter using cathode luminescence or plasma discharge, a cold cathode tube, a light emitting diode, a laser diode, or an organic light emitting diode. Device. The display device according to any one of claims 1 to 7, wherein the first light source is a light source included in the projection device. It is an optical adjustment sheet
The first surface on which the first light emitted by the first light source is incident, and
A second surface facing the first surface and incident with a second light emitted by a second light source included in the display device, and a second surface.
With
It is provided so as to cover the display surface portion included in the display device.
Of the first light and the second light, light in a predetermined wavelength region is reflected, and the light is reflected.
The second light is light for displaying a moving image on the display surface portion, and has a plurality of emission peak wavelengths when incident on the second surface.
In the reflection spectrum of the optical adjustment sheet,
The first condition is that the reflected peak wavelength is located between two adjacent emission peak wavelengths among the plurality of emission peak wavelengths, and the half width of the reflection peak is equal to or less than the difference between the two adjacent emission peak wavelengths. year,
The condition that the reflection peak wavelength is located between the shortest emission peak wavelength of the plurality of emission peak wavelengths and 380 nm and the half width of the reflection peak is equal to or less than the difference between the shortest emission peak wavelength and 380 nm is the first condition. 2 conditions
The condition that the reflection peak wavelength is located between the longest emission peak wavelength of the plurality of emission peak wavelengths and 780 nm and the half width of the reflection peak is equal to or less than the difference between the longest emission peak wavelength and 780 nm is the first condition. When there are 3 conditions
The reflection spectrum is an optical adjustment sheet that satisfies at least one of the first condition, the second condition, and the third condition.

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