WO2010109723A1 - 表示装置 - Google Patents
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- Publication number
- WO2010109723A1 WO2010109723A1 PCT/JP2009/069548 JP2009069548W WO2010109723A1 WO 2010109723 A1 WO2010109723 A1 WO 2010109723A1 JP 2009069548 W JP2009069548 W JP 2009069548W WO 2010109723 A1 WO2010109723 A1 WO 2010109723A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- display device
- display
- display panel
- liquid crystal
- protective plate
- Prior art date
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Images
Classifications
-
- 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
- G02F1/133502—Antiglare, refractive index matching layers
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133331—Cover glasses
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133541—Circular polarisers
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
- G02F2201/083—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer infrared absorbing
Definitions
- the present invention relates to a display device. More specifically, the present invention relates to a display device that includes a protective plate for protecting the display panel and can be suitably used as a digital signage.
- an advertising medium called digital signage
- digital signage As one form of use of a liquid crystal display device, an advertising medium called digital signage is known, and its demand is increasing. Since digital signage is often used outdoors, a protective plate for protecting a liquid crystal panel used as a display panel from an external impact or dust is disposed on the display surface side.
- the liquid crystal display device having the above configuration When the liquid crystal display device having the above configuration is used under sunlight, sunlight is reflected on the surface of the protective plate, making it difficult to see the image display, or the temperature of the liquid crystal panel rises and the temperature of the liquid crystal changes phase. When the point is exceeded, the alignment state of the liquid crystal changes, and display defects may occur. Therefore, reduction of reflected light on the surface of the display device and suppression of temperature rise of the liquid crystal panel are required.
- Patent Document 3 discloses an optical filter provided with an antireflection film on the display surface side of the protective plate in order to reduce reflected light, and further provided with a film that reflects near infrared rays in order to prevent malfunction of the remote control. Proposed. Since the above-described temperature rise of the liquid crystal panel is mainly caused by infrared rays contained in sunlight, it is possible to reduce reflected light and suppress the temperature rise of the liquid crystal panel by providing the optical filter on the protective plate. Seems to be.
- the antireflective film described in Patent Document 1 can only suppress the reflectance of light having a specific wavelength, thereby causing blue or red tones to be generated in the reflected light. May affect properties.
- the film described in Patent Document 2 can suppress an increase in the temperature of the liquid crystal panel, but has a structure in which an oxide such as Bi (bismuth) or Y (yttrium) is contained in a transparent resin component.
- the rate is high, and when used under sunlight, visible light may be reflected, making it difficult to see the image display.
- the visible light reflectance of a glass substrate heat ray reflective glass, manufactured by Asahi Glass Co., Ltd., trade name Suncut ⁇
- a glass substrate heat ray reflective glass, manufactured by Asahi Glass Co., Ltd., trade name Suncut ⁇
- the present invention has been made in view of the above-described present situation, and since reflection is suppressed and a temperature rise of the display panel can be suppressed, good display characteristics can be obtained even when used outdoors, and simple.
- An object of the present invention is to provide a display device that can be realized by a configuration.
- the inventors of the present invention have studied various means for improving the display characteristics of the display device, and note that visible light and infrared rays contained in sunlight affect the display characteristics when used outdoors. did. And, with respect to the protective plate arranged on the front surface of the display panel, (1) the surface reflection of visible light can be suppressed by providing a low-reflection film having a nanostructure formed on the observation surface side, (2) By arranging a combination of an infrared shielding film and a circularly polarizing plate on the display panel side, infrared rays can be shielded while suppressing internal reflection of visible light, and a simple configuration is achieved by the methods (1) and (2). Thus, the inventors have found that a display device with good display characteristics can be realized, and have conceived that the above-mentioned problems can be solved brilliantly, and have reached the present invention.
- the present invention is a display device comprising a display panel and a protective plate disposed closer to the observation surface than the display panel, wherein the protective plate has a nanostructure on the main surface on the observation surface side. And a circularly polarizing plate and an infrared shielding film from the protective plate side to the display panel side on the main surface on which the display panel is disposed.
- the display devices are arranged in this order.
- the display panel examples include a liquid crystal panel, an organic electroluminescence (EL) panel, a plasma display panel (PDP), and a field emission display (FED) panel.
- EL organic electroluminescence
- PDP plasma display panel
- FED field emission display
- the protective plate is a substrate for protecting the display panel from dust and impact. Usually, it is formed of a transparent member, and for example, a resin plate made of an acrylic resin or a polycarbonate resin, a glass substrate, or the like can be used. Further, the protective plate may be colorless or colored. When the protective plate is colorless, the display device can display an image of the color tone as displayed on the display panel. On the other hand, when the protective plate is colored, the display device can display the display panel. Can be displayed as an image that has been changed to a color tone such as blue or red.
- the thickness of the protective plate is not particularly limited.
- the low reflection film is not particularly limited as long as the nanostructure is formed on the surface, but the nanostructure is formed on the surface of a transparent resin film such as an acrylic resin film. Is preferred.
- the shape of the protrusion is not particularly limited, and various shapes of protrusions such as a conical shape, a pyramid shape, a cylindrical shape, and a prism shape can be applied.
- Examples of the formation method of the nanostructure described above include a formation method by a nanoimprint method and a method of forming a film of a resin in which nanoparticles or fillers are dispersed.
- the reflectance of the low reflection film is preferably 0.9% or less.
- a low reflection film having a moth-eye structure can be suitably used as the nanostructure.
- the moth-eye structure is a structure in which a plurality of conical protrusions having an average height of 10 nm or more and 500 nm or less are formed, and the adjacent pitch interval is preferably 30 nm or more and 600 nm or less. Adjacent pitch periods may be regular or irregular.
- a film (sheet) having a moth-eye structure on the surface can be realized, for example, by forming the moth-eye structure on the surface of a film formed of a photocurable acrylic resin or the like.
- the refractive index of the film serving as the film base is 1.5
- the visible light reflectance is about 0.2%. Can be reduced. This is because the protrusions of the nanostructure are sufficiently smaller than the length of the wavelength of visible light (380 to 780 nm), and when viewed from the visible light, the tips of the protrusions of the nanostructure and the base film under the protrusions This is thought to be because the refractive index seems to change continuously from 1.0 to 1.5.
- the circularly polarizing plate is generally composed of a linear polarizer and a ⁇ / 4 retardation plate.
- the ⁇ / 4 retardation plate is a birefringent body having a thickness direction retardation (95 to 195 nm) that is 1 ⁇ 4 of the wavelength of visible light, and preferably has a thickness direction retardation of 120 to 150 nm. It is a birefringent body.
- the circularly polarizing plate is preferably composed of a linear polarizer provided with a protective layer and a ⁇ / 4 retardation plate, and is attached to the protective plate via the protective layer.
- a linear polarizer is generally weak in humidity, mechanical strength, and the like.
- the circularly polarizing plate is not on the observation surface side of the protective plate, but on the display panel to protect it from water. Must be placed on the side.
- linear polarizer As a linear polarizer provided with a protective layer, for example, a PVA (polyvinyl alcohol) film on which an iodine complex or a dichroic dye is adsorbed is used as the linear polarizer, and this linear polarizer is triacetylcellulose (TAC) or the like.
- TAC triacetylcellulose
- interposed by the protective layer which consists of this cellulose polymer is mentioned.
- the protective layer may be provided on both surfaces of the linear polarizer or may be provided only on the surface on the protective plate side.
- the protective layer is preferably capable of absorbing ultraviolet rays in order to suppress the deterioration of PVA, and preferably capable of reducing ultraviolet rays having a wavelength shorter than 370 nm incident on the protective layer to 1.0% or less. .
- the circularly polarizing plate can be used as a polarizing plate disposed on the observation surface side of the liquid crystal panel.
- a polarizing plate for reducing internal reflection and a polarizing plate for black display are provided separately.
- the number of polarizing plates to be used can be reduced by one, and the cost can be reduced.
- the infrared shielding film may be either an infrared absorbing film that absorbs infrared rays or an infrared reflecting film that reflects infrared rays.
- the infrared shielding film preferably has an infrared shielding rate of 10% or more.
- Infrared rays include near infrared rays, mid-infrared rays, and far infrared rays. However, since the near infrared rays (750 to 2500 nm) mainly cause the temperature rise of the display panel, near infrared rays are mainly used in the present invention.
- the film can absorb or reflect the light, and the shielding rate against near infrared rays is particularly preferably 10% or more. Moreover, since the infrared shielding film is disposed on the display surface side of the display panel, it is preferable to have transparency.
- the infrared shielding film preferably contains a metal oxide.
- Metal oxides often have an excellent infrared shielding effect because the plasma frequency is near the boundary between the visible light region and the near infrared region (800 to 1000 nm).
- the conductivity is not necessarily required in order to produce an effect as an infrared shielding film.
- the metal oxide examples include ITO (Indium Tin Oxide), ATO (Antimony Tin Oxide; tin oxide doped with antimony), ZTO (Zinc Tin Oxide), antimony oxide, and zinc oxide.
- ITO Indium Tin Oxide
- ATO Antimony Tin Oxide; tin oxide doped with antimony
- ZTO Zinc Tin Oxide
- antimony oxide and zinc oxide.
- ATO and antimony oxide are known in the form of fine particles, and these are preferable because they can be filled into a resin to easily form a thin film.
- the metal oxide preferably has an average particle size of less than 100 nm. This is because when the average particle diameter of the particles exceeds 100 nm, visible light scattering occurs and the display image tends to become cloudy.
- the infrared shielding film formed of the above metal oxide usually has a very high refractive index of about 2.0, and thus has a high visible light reflectance.
- infrared rays can be shielded while suppressing reflection of visible light. The reason for this will be described below.
- the low reflection film, the protective plate, the circularly polarizing plate, and the infrared shielding film are arranged in this order from the observation surface side. That is, the low reflection film is provided on the observation surface side of the protection plate because it reduces light reflection on the surface of the protection plate. Since the infrared shielding film has a high visible light reflectance as described above, the infrared shielding film is disposed closer to the display panel than the low reflection film. However, since this infrared ray shielding film easily increases in temperature due to infrared rays, it is not provided directly on the display panel, but is provided on the protective plate side.
- the infrared shielding film is a film having high reflectance as described above, it is necessary to dispose a circularly polarizing plate on the observation surface side in order to suppress reflection of visible light.
- This circularly polarizing plate is installed on the display panel side of the protective plate in order to increase the water resistance, whereby the infrared shielding film is also installed on the display panel side of the protective plate.
- the low reflection film is arranged on the observation surface side of the protective plate, and the circularly polarizing plate and the infrared shielding film are arranged in this order on the display panel side.
- the configuration of the display device of the present invention is not particularly limited by other components as long as such components are essential.
- the display device configured as described above has a simple configuration in which a low reflection film, a protective plate, a circularly polarizing plate, and an infrared shielding film are arranged in this order, and suppresses reflection of light and a display panel. Temperature rise can be suppressed, and excellent display characteristics can be realized.
- the reflection of light includes one that occurs on the surface of the protective plate on the observation surface side (low reflection film), one that occurs on the infrared shielding film, and one that occurs on the surface of the display panel. That is, when the display device is irradiated with sunlight, light reflected on the surface of the protective plate (low reflection film) and light transmitted through the protective plate are generated.
- the low reflection film is provided on the observation surface side of the protective plate as described above, unnecessary reflected light is suppressed, and a display device with good image display can be obtained.
- Visible light out of the light that has passed through the protective plate is converted into linearly polarized light by a linear polarizer, and then converted into circularly polarized light by passing through a ⁇ / 4 phase difference plate.
- Part of the visible light that has passed through the ⁇ / 4 retardation plate is reflected by the surface of the infrared shielding film, and the rest is reflected by the surface or inside of the display panel through the infrared shielding film, or passes through the display panel. .
- Visible light reflected on the surface of the infrared shielding film, the surface of the display panel, or inside is converted to circularly polarized light in the reverse direction and enters the ⁇ / 4 phase difference plate again, is converted into linearly polarized light, and is almost absorbed by the linear polarizer.
- infrared light such as near infrared light having a wavelength of 750 to 2500 nm
- the display panel when the display panel is a liquid crystal panel, the temperature rise of the display panel is caused by the polarizing plate constituting the liquid crystal panel and the black matrix of the color filter layer.
- the liquid crystal panel generally has a configuration in which liquid crystal is sandwiched between a color filter substrate for performing color display and a counter substrate, and a polarizing plate is provided on the surfaces of both substrates.
- the color filter substrate is a transparent glass substrate provided with, for example, R (red), G (green), and B (blue) color filter layers, and each color filter layer is called a black matrix. It is partitioned by a black colored layer. Since the black matrix is black, it absorbs sunlight and easily generates heat. Further, the color filter substrate has a transparent electrode disposed closer to the liquid crystal layer than the color filter layer, and the transparent electrode also absorbs sunlight and generates heat.
- the transparent electrode and the light emitting layer absorb sunlight
- the display panel is a PDP
- the body and black layer absorb sunlight and generate heat.
- a display panel used outdoors is generally used by being housed in a housing.
- a driver, wiring, and the like are housed in the housing, and the housing is colored from the viewpoint of design so that these are difficult to see from the outside.
- the housing By being colored in this way, the housing also absorbs sunlight and generates heat in the same manner as described above.
- the temperature of the display panel rises due to the generation of heat as described above, in the case of an organic EL or PDP, the light emission efficiency may be lowered, or the reliability may be adversely affected in the long term.
- the display panel has a light shielding member in a non-display region, and the infrared shielding film is in a region corresponding to the light shielding member. What is formed is mentioned.
- the light shielding member in the non-display area is, for example, the black matrix described above.
- Such an infrared shielding film can be realized, for example, by forming a pattern by mixing ATO fine particles in an ultraviolet (UV) photosensitive resin material.
- the infrared shielding film may absorb visible light depending on the material to be formed. Even in such a case, the infrared shielding film is provided only in the non-display region, thereby increasing the visible light transmittance. Without consideration, an infrared shielding film can be formed of a material having a high infrared shielding effect, and the visible light transmittance in the display region is not lowered, and thus a good image display can be performed.
- the protective plate and the display panel are thermally separated.
- being thermally separated means that a vacuum layer or a gas layer is formed between the main surface of the protective plate and the main surface of the display panel.
- the vacuum layer is formed in that the temperature rise of the display panel due to gas convection can be suppressed.
- the protective plate further includes a base material layer in which the retardation in the surface direction and the thickness direction is substantially zero (optically isotropic),
- the base material layer include those disposed on the display panel side with respect to the infrared shielding film.
- the display device may further include a support substrate on the side of the display panel opposite to the side on which the protective plate is disposed. By using such a support substrate, the back side of the display panel can be protected.
- the display device may further include a low reflective film in which a nanostructure is formed between the display panel and the support substrate. With such a configuration, reflection of light from the light source provided on the back side of the display panel can be reduced.
- the display device may further include a light source on the side of the display panel opposite to the side on which the protective plate is disposed.
- Examples of the display device having such a configuration include a transmissive liquid crystal display device and a transflective liquid crystal display device when the display panel is a liquid crystal panel.
- the display panel and the support substrate may be in contact with each other.
- the air interface between the display panel and the support substrate can be reduced, so that when the light source is provided on the support substrate side, the light from the light source can be taken in efficiently.
- the protective plate and the support substrate are thermally insulated.
- the support substrate may be a light guide plate.
- the light guide plate is a plate-like member on which a pattern for reflecting, refracting and diffusing light is formed. The light for reflecting the light incident from the light source by the reflecting portion and dispersing the light on the display surface and emitting it. It is a member.
- the shape, material, and the like of the light guide plate are not particularly limited, but are usually formed of a colorless and transparent plate material having a certain thickness.
- a suitable use of the display device according to the present invention is digital signage.
- Digital signage is an advertising medium that is used outdoors as described above.
- reflection of light on the surface of the protective plate can be suppressed even when exposed to sunlight, and display is possible. Since the temperature rise of the panel can be suppressed, digital signage with good display characteristics can be realized.
- a cooling device for cooling the display panel which has been necessary in the past, becomes unnecessary, and the cost can be reduced.
- a display panel is housed in a housing, and the display panel and the housing are covered with a protective plate.
- the housing generally contains a backlight as a light source, a driver for driving the display panel, and the like in addition to the display panel.
- the shape, material, strength, and the like of the housing are not particularly limited, and are appropriately set according to the shape of the display panel, the intended use, and the like.
- each member / film provided on the protective plate can be verified by measuring transmittance and reflectance.
- the display device of the present invention since the reflection is suppressed and the temperature rise of the display panel can be suppressed, a display device that can obtain good display characteristics even when used outdoors can be realized with a simple configuration. .
- FIG. 1 is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention
- (b) is a top view explaining the attachment state of a liquid crystal panel
- (c) is (b) Is a cross-sectional view taken along line AB of FIG. It is a figure which shows the radiation wavelength distribution of the light source in the solar radiation irradiation test of the display panel in Example 1 and Comparative Example 1.
- FIG. It is a graph which shows the result of having measured the characteristic of the infrared shielding film which concerns on Example 2 of this invention.
- It is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 2 of this invention.
- (A)-(c) is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 3 of this invention. It is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 4 of this invention. It is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 5 of this invention. It is a cross-sectional schematic diagram which shows the structure of the display apparatus which concerns on Embodiment 6 of this invention.
- FIG. 1A is a schematic cross-sectional view illustrating a configuration of a display device according to Embodiment 1 of the present invention
- FIG. 1B is a plan view illustrating a mounting state of a liquid crystal panel.
- c) is a cross-sectional view taken along the line AB of FIG.
- the display device according to the present embodiment can correspond to any of a transmission type, a reflection type, and a transflective display device, but here, a transmission type display device will be described as an example.
- the display device 100 includes a protection plate 1, a liquid crystal panel 2, and a support substrate 3, and the liquid crystal panel 2 is held on the housing 4 via a support body 17.
- a backlight 30 is provided on the back side of the support substrate 3.
- the liquid crystal panel 2 is held by a support 17 that is formed slightly larger than the outer shape of the liquid crystal panel 2.
- the support 7 is preferably formed of a heat insulating material.
- the liquid crystal panel 2 held on the support 17 is fixed to the housing 4 with screws.
- the protective plate 1 is made of a transparent member, and an antireflection film 5 having a surface on which a moth-eye structure exists is formed on the main surface on the observation surface side.
- the circularly polarizing plate 6 is composed of a polarizer 8 and a ⁇ / 4 phase difference plate 9, and the polarizer 8 is composed of a linear polarizer 10 and protective layers 11a and 11b disposed on both sides thereof.
- the infrared shielding film 7 was formed to have the same pattern as the black matrix formation pattern on the color filter substrate of the liquid crystal panel 2.
- the liquid crystal panel 2 may be either an active matrix type or a passive matrix type.
- the active matrix type liquid crystal panel 2 will be described as an example.
- the liquid crystal panel 2 has a configuration in which liquid crystal is aligned between a color filter substrate and a TFT substrate.
- the color filter substrate includes a color filter layer of each color of R (red), G (green), and B (blue) on a main surface of the glass substrate and a black matrix partitioning the color filter layer.
- a switching TFT element corresponding to each pixel is provided on the main surface.
- a circularly polarizing plate 12 is provided on the support substrate 3 side of the liquid crystal panel 2, and the circularly polarizing plate 12 includes a polarizer 13 and a ⁇ / 4 retardation plate 14.
- the polarizer 13 includes a linear polarizer 15 and protective layers 16a and 16b arranged on both sides thereof.
- the circularly polarizing plate is not provided on the main surface on the observation surface side of the liquid crystal panel 2, the circularly polarizing plate 6 attached to the protective plate 1 becomes a polarizing plate corresponding to the circularly polarizing plate 12, and the polarizer. 8 and the polarizer 13 are arranged so that their absorption axes are orthogonal to each other.
- the support substrate 3 is made of a transparent member, and for example, a resin plate made of an acrylic resin or a COP (cycloolefin polymer) resin, a glass substrate, or the like can be used.
- the housing 4 accommodates the liquid crystal panel 2, and the liquid crystal panel 2 is attached to the housing 4 while being held by the support body 17 as described above.
- the housing 4 accommodates a driver and the like for driving the display panel (not shown here).
- the protective plate 1 is disposed so as to cover the liquid crystal panel 2 held by the housing 4, but the protective plate 1 and the liquid crystal panel 2 are thermally insulated by the housing 4. Moreover, since the air layer 20 is formed between the protective plate 1 and the liquid crystal panel 2, the protective plate 1 and the liquid crystal panel 2 are more reliably thermally separated.
- the following describes light reflection and the like when the display device 100 configured as described above is used outdoors.
- the surface of the protection plate 1 When irradiated with sunlight, the surface of the protection plate 1 generates reflected light and light incident on the protection plate 1.
- the visible light which is originally reflected on the surface of the protective plate 1 is suppressed from being reflected by the antireflection film 5, reflection is suppressed and good display characteristics can be obtained.
- visible light incident on the protective plate 1 is converted into linearly polarized light by the polarizer 8, and then passes through the ⁇ / 4 phase difference plate 9 and is converted into circularly polarized light.
- a part of infrared light and visible light in the display area passes through the air layer 20 and is reflected on the surface of the liquid crystal panel 2, but the reflected light is again the circularly polarizing plate 6 with the rotation direction of the circularly polarized light reversed. Therefore, most of the light is absorbed by the circularly polarizing plate 6. Since visible light in the display area passes through the air layer 20 without passing through the infrared shielding film 7, the visible light transmittance in the display area is not reduced.
- infrared light in the non-display area is absorbed or reflected by the infrared shielding film 7.
- the light reflected by the surface of the infrared shielding film 7 enters the circularly polarizing plate 6 again in a state where the rotation direction of the light is reversed, and the light transmitted through the infrared shielding film 7 passes through the air layer 20. , Enters the circularly polarizing plate 6 in the same manner as described above.
- most of the light is absorbed by the circularly polarizing plate 6.
- the display device 100 according to the present embodiment can suppress the reflection even when used outdoors, and has good display characteristics.
- the temperature rise of the liquid crystal panel 2 is caused by the black matrix and the polarizing plate constituting the liquid crystal panel 2, but in the first embodiment, the infrared shielding film 7 is provided at a position corresponding to the black matrix. Since the light from which the infrared rays have been removed has reached the liquid crystal panel 2, an increase in the temperature of the liquid crystal panel 2 can be suppressed.
- the circularly polarizing plate 6 which is a polarizing plate is attached to the protective plate 1 instead of the liquid crystal panel 2, the temperature of the liquid crystal panel 2 does not rise, and even if the temperature of the protective plate 1 rises, the protective plate Since 1 and the liquid crystal panel 2 are thermally separated, the heat of the protective plate 1 is not easily transmitted to the liquid crystal panel 2, and this can also suppress the temperature rise of the liquid crystal panel 2. Therefore, the change in the alignment of the liquid crystal caused by the temperature rise of the liquid crystal panel 2 can be suppressed, and the liquid crystal panel 2 with good display characteristics can be realized.
- a polarizer 8 in which protective layers 11 a and 11 b are laminated on both surfaces of a linear polarizer 10 and a film in which an infrared shielding film 7 is attached to a ⁇ / 4 retardation plate 9 are prepared.
- the linear polarizer 8 and the film are bonded together through an adhesive layer in a state where the absorption axis of the linear polarizer 10 and the slow axis of the ⁇ / 4 retardation plate 9 are shifted by 45 °, and the obtained laminated film Is affixed on the main surface of the protective plate 1 via an adhesive layer.
- the antireflection film 5 is attached to the other main surface of the protective plate 1 via an adhesive layer.
- the ⁇ / 4 phase difference plate 11 and the circularly polarizing plate 12 are attached to the side where the TFT substrate of the liquid crystal panel 2 composed of the color filter substrate and the TFT substrate is disposed via an adhesive layer.
- the liquid crystal panel 2 having the above configuration is disposed between the protective plate 1 having the above configuration and the support substrate 3 and held by the housing 4.
- the case 4 is configured to fix the liquid crystal panel 2 and prevent outside air from entering the inside of the case 4, and a portion for fixing the liquid crystal panel 2 is formed of a heat insulating material such as rubber.
- the housing 4 may be provided with a mechanism for circulating cooled air in order to suppress the temperature rise of the liquid crystal panel 2.
- the display apparatus 100 is obtained by providing the backlight 30 which is a light source in the back side of the support substrate 3.
- FIG. 1 is a diagrammatic representation of the display apparatus 100 .
- the display device 100 according to the first embodiment will be described with reference to examples, comparative examples, and reference examples regarding the temperature rise suppression effect of the liquid crystal panel 2 and the antireflection effect of the protective plate 1.
- Example 1 (Configuration of display panel)
- the protective plate 1 is an acrylic resin plate having a refractive index of 1.5 and a thickness of 3.0 mm.
- the antireflection film 5 a film formed of a photocurable acrylic resin and having a moth-eye structure on the surface thereof was used.
- the moth-eye structure a plurality of conical protrusions having an average height of about 200 nm were formed, and the pitch interval between adjacent ones was about 200 nm or less.
- liquid crystal panel 2 a 16 type active matrix type liquid crystal panel was used, and for example, a liquid crystal layer having a liquid crystal layer temperature of 80 ° C. and causing a phase transition in an isotropic phase was selected.
- the support substrate 3 was a transparent acrylic resin plate having a refractive index of 1.5 and a thickness of 3.0 mm.
- the surface temperature on the display surface side of the liquid crystal panel 2 was measured using a thermocouple (copper constantan), and the surface temperature of the liquid crystal panel 2 was 24 ° C. .
- the surface temperature of the liquid crystal panel 2 was 34 ° C.
- the integrated irradiance was 952 W / m 2 (wavelength 300 to 2500 nm) at a distance of 10 cm.
- the radiation wavelength distribution of the light source is shown in FIG.
- Comparative Example 1 Using a 16-inch liquid crystal panel similar to that in Example 1, circularly polarizing plates were arranged in crossed Nicols on both main surfaces of the liquid crystal panel. Moreover, the protective plate was arrange
- Example 1 Based on the measurement results of Example 1 and Comparative Example 1, the temperature rise of the liquid crystal panel under actual sunshine conditions is estimated. According to the website of the Japan Meteorological Agency, for example, the amount of solar radiation in Osaka in July 2008 is 18.0 MJ / day. When the light source of the above experiment is used, it corresponds to an irradiation amount of 5.3 hours (Hr). Therefore, the following results can be estimated from the experiments of Example 1 and Comparative Example 1.
- Example 1 since the liquid crystal panel of Example 1 does not reach the liquid crystal phase transition temperature of 80.0 ° C., there is no inconvenience in display. Since the phase transition temperature greatly exceeds 80.0 ° C., it is considered that the display cannot be performed and the screen becomes black. Thereby, in Example 1, it can be concluded that the effect which suppresses the temperature rise of the liquid crystal panel 2 is high even under actual sunlight.
- the wavelength distribution of solar energy falling on the ground is 5.33% for light with a wavelength of 300 to 400 nm, 48.48% for light with a wavelength of 400 to 700 nm, and 46.20 for light with a wavelength of 700 to 2500 nm for one year. % (See Suga Test Instruments Co., Ltd., Technical Report, 1997 data).
- the absorption rate of light of each wavelength is constant, when the liquid crystal panel 2 receives sunlight directly outdoors, it is important to shield light having a wavelength of 700 to 2500 nm. is there. This is because the near-infrared energy accounts for about half of the total energy of sunlight, and it is considered that the temperature rise of the liquid crystal panel can be almost halved by shielding the near-infrared light.
- Example 2 In order to investigate the characteristics of the infrared shielding film 7 used in Example 1, the infrared shielding film 7 was attached to the entire surface of a 0.7 mm thick glass substrate using an adhesive, and the light transmittance was measured.
- the light source was a C light source, and measurement was performed using a spectrophotometer (manufactured by Shimadzu Corporation, UV3100PC) with a 2 ° field of view. The obtained measurement results are shown in FIG.
- the vertical axis represents the transmittance (%) of light transmitted through the infrared shielding film
- the horizontal axis represents the wavelength ⁇ (nm) of light.
- the infrared shielding film 7 has a transmittance of 80% or more in the region where the wavelength is about 780 nm or less, but the transmittance is reduced in the region where the wavelength is about 780 nm or more.
- the infrared shielding rate of the infrared shielding film 7 was 54%.
- near infrared rays (wavelength: about 780 to 2500 nm) contained in sunlight are cut by the infrared shielding film 7, and mainly light other than near infrared rays reaches the liquid crystal panel. It is thought that the temperature rise of the is suppressed.
- Comparative Example 2 The same infrared shielding film as in Example 1 was further provided on the circularly polarizing plate on the observation surface side of the liquid crystal panel configured in the same manner as in Comparative Example 1. The same protective plate as in Comparative Example 1 was used. Then, according to the method described in JIS-Z8722, the reflectance on the surface of the protective plate was measured by a specular reflection light entering method using a spectrocolorimeter (manufactured by Konica Minolta, CM-2002). The obtained reflectance was 12.38%.
- Reference example 1 The same antireflection film as in Example 1 was further provided on both main surfaces of the protective plate according to Comparative Example 2. Then, when the reflectance on the surface of the protective plate was measured in the same manner as in Comparative Example 2, the obtained reflectance was 5.21%, which was 57.9% lower than that in Comparative Example 2. It was.
- Example 3 When the surface reflectance of the protective plate 1 in Example 1 was measured in the same manner as in Comparative Example 2, the obtained reflectance was 0.30%, which was 97.6% of the reflectance of Comparative Example 2. Reduction was achieved.
- Comparing Comparative Example 2 and Reference Example 1 when the protective plate 1 is viewed from the observation surface side rather than the configuration in which the antireflection film is provided on both surfaces of the protective plate 1, the antireflection film, the circularly polarizing plate, and It has been clarified that the configuration in which the infrared shielding films are arranged in this order has a higher reflectance reduction effect. From Comparative Example 2 and Example 3, it is considered that the effect of reducing the reflectance can be obtained by providing the circularly polarizing plate not on the liquid crystal panel side but on the protective plate side.
- FIG. 4 is a schematic cross-sectional view showing a configuration of a display device according to Embodiment 2 of the present invention. 4, in addition to the configuration of the display device 100 described above, the display device 200 further includes a base material layer 21 on the main surface of the protective plate 1 on the liquid crystal panel 2 side, and the light source 30 is not illustrated.
- the base material layer 21 is disposed when, for example, the infrared shielding film 7 and the circularly polarizing plate 6 are separately formed and provided on the protective plate 1. That is, it is formed when the infrared shielding film 7 is formed on the base material layer 21 and this infrared shielding film 7 is bonded onto the circularly polarizing plate 6 with an adhesive layer (not shown).
- the base material layer 21 serves as a support member when the infrared shielding film 7 is attached to the protective plate 1, and is configured to be sandwiched between the circularly polarizing plate 6 and the circularly polarizing plate 12. Therefore, in order not to impair the effects of the circularly polarizing plates 6 and 12, the base material layer 21 preferably has a small phase difference between the surface direction and the thickness direction, and a TAC film used as a protective film for the polarizing plate can be used. More preferably, the retardation in the thickness direction is 10 nm or less, and the retardation in the surface direction and the thickness direction is substantially zero. As the base material layer 21 having such characteristics, there is a TAC film called a zero retardation film, and this TAC film also has a protective effect for the circularly polarizing plate 6.
- FIGS. 5A to 5C are schematic cross-sectional views showing the configuration of a display device according to Embodiment 3 of the present invention.
- the display device 300 is different in that the protective layers 11 b and 16 a are removed from the configuration of the display device 100 described above, but other configurations have the same configuration as the display device 100.
- the light source 30 is not shown.
- the protective layer 11b provided on the protective plate 1 side in the display device 100 according to the first embodiment is eliminated, and the ⁇ / 4 retardation plate 9 protects the linear polarizer 10.
- the structure also serves as a layer.
- the protective layer 16 a provided on the liquid crystal panel 2 is eliminated, and the ⁇ / 4 retardation plate 14 serves as a protective layer for the linear polarizer 15.
- two protective layers of the circularly polarizing plate 6 can be eliminated, so that the manufacturing cost can be reduced and the display device 300 can be reduced in size and thickness.
- each of the protective layers provided on the protective plate 1 and the liquid crystal panel 2 is eliminated, but the present invention is not limited to this.
- any one protective layer is provided. It is good also as a structure which reduces.
- the ⁇ / 4 retardation plate 14, the linear polarizer 15, and the protective layer 16b provided in the liquid crystal panel 2 in the display device 300 are It is good also as a structure provided in the support substrate 3 side. This is due to the following reason.
- the liquid crystal panel 2 has a configuration in which the color filter substrate and the TFT substrate are disposed to face each other.
- the color filter substrate and the TFT substrate are formed. Since the elastic modulus of the glass and the elastic modulus of the resin forming each film are different by one digit or more, the liquid crystal panel 2 may be warped due to a difference in stress applied to both main surfaces of the liquid crystal panel 2. Therefore, by providing a film having a multilayer structure provided on the TFT substrate side on the support substrate 3 side, it is possible to eliminate the warp caused by the difference in stress.
- the display device 310 in which the ⁇ / 4 phase difference plate 14, the linear polarizer 15, and the protective layer 16b are separated from the liquid crystal panel 2 has excellent display stability without causing warpage of the liquid crystal panel 2. It can be.
- the protective layer 11a and the protective layer 16b provided in the display device 310 may be replaced with the display device 320 as shown in FIG. 5C.
- the protective plate 1 serves as a protective layer for the linear polarizer 10
- the support substrate 3 serves as a protective layer for the linear polarizer 15.
- the number of constituent members can be minimized, the manufacturing cost can be reduced, and the display device 320 can be reduced in size and thickness.
- FIG. 6 is a schematic cross-sectional view showing the configuration of the display device 400 according to the present embodiment.
- the display device 400 according to the present embodiment has a configuration in which antireflection films 51, 52, and 53 are further provided in the display device 100 shown in FIG.
- the reflection loss of the backlight 30 can be reduced by providing the antireflection films 51, 52, 53 on the support substrate 3 and the liquid crystal panel 2 side as well.
- the antireflection films 51, 52, and 53 are provided on the support substrate 3 and the liquid crystal panel 2 side.
- the antireflection film is provided only on one of the support substrate 3 and the liquid crystal panel 2.
- the support substrate 3 may have a configuration in which an antireflection film is provided only on one of the main surfaces.
- FIG. 7 is a schematic cross-sectional view showing a configuration of a display device 500 according to Embodiment 5 of the present invention.
- the display device 500 according to the present embodiment has a configuration in which the liquid crystal panel 2 is bonded to the support substrate 3 side in the display device 100 shown in FIG.
- the air interface between the liquid crystal panel 2 and the support substrate 3 can be reduced, and the reflection loss of the backlight 30 can be reduced.
- the liquid crystal panel 2 and the support substrate 3 be installed apart from each other without being bonded to insulate the protective plate 1 and the support substrate 3. . Thereby, the temperature rise of the liquid crystal panel 2 can be suppressed.
- FIG. 8 is a schematic cross-sectional view showing a configuration of a display device 600 according to Embodiment 6 of the present invention.
- the display device 600 according to the present embodiment is a side light system in which the support substrate 3 is the light guide plate 60 and the light source 61 is provided on the side of the light guide plate 60 in the display device 100 shown in FIG.
- the present invention is not limited to this, and various types such as an organic EL panel, a PDP, and an FED panel are used. Applicable for display panels.
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Abstract
Description
図1(a)は、本発明の実施形態1に係る表示装置の構成を示す断面模式図であり、図1(b)は、液晶パネルの取り付け状態を説明する平面図であり、図1(c)は、図1(b)のA-B線に沿う断面図である。本実施形態に係る表示装置は、透過型、反射型、半透過型の表示装置のいずれにも対応できるが、ここでは、透過型の表示装置を例に挙げて説明する。
(表示パネルの構成)
図1(a)に示す表示装置100において、保護板1は、屈折率1.5、厚み3.0mmのアクリル樹脂板を用いた。反射防止膜5としては、光硬化性のアクリル樹脂にて形成され、モスアイ構造を表面に有するものを用いた。モスアイ構造は、平均高さが約200nmである円錐状の突起が複数形成されたものであり、隣り合うピッチ間隔は約200nm以下であった。
実施例1に係る液晶パネル2の基板面から、保護板1の観察面側に10cm離して、光源として人工天空照明装置(セリック社製、型番XC-100AF)を配置し、日射照射試験を行った。
実施例1と同様の16型の液晶パネルを用いて、液晶パネルの両主面上に円偏光板をクロスニコルに配置した。また、保護板には反射防止膜5と赤外線遮蔽膜7とを設けずに、円偏光板を貼った液晶パネルの上に空気層を介して保護板を配置した。そして、保護板の上から、実施例1と同様にして、光を照射して光の照射前と照射後の液晶パネルの円偏光板上の表面温度を測定した。光の照射前の表面温度は24℃であり、照射1時間後の表面温度は39℃であった。
実施例1で用いた赤外線遮蔽膜7の特性を調べるために、赤外線遮蔽膜7を粘着剤を用いて、厚み0.7mmのガラス基板の全面に貼り付けて、光の透過率を測定した。光源はC光源とし、測定は分光光度計(島津製作所社製、UV3100PC)を用いて、2°の視野で行った。得られた測定結果を図3に示す。
比較例1と同様に構成された液晶パネルの観察面側の円偏光板の上に、実施例1と同じ赤外線遮蔽膜を更に設けた。保護板は、比較例1と同じものを用いた。そして、JIS-Z8722に記載の方法に準じて、分光測色計(コニカミノルタ社製、CM-2002)を用いて正反射光込み方式により保護板の表面における反射率を測定した。得られた反射率は、12.38%であった。
比較例2に係る保護板の両主面上に、実施例1と同じ反射防止膜を更に設けた。そして、比較例2と同様にして保護板の表面における反射率を測定したところ、得られた反射率は、5.21%となり、比較例2よりも57.9%の反射率の低減が図れた。
実施例1における保護板1の表面反射率を、比較例2と同様にして測定したところ、得られた反射率は、0.30%となり、比較例2よりも97.6%の反射率の低減が図れた。
図4は、本発明の実施形態2に係る表示装置の構成を示す断面模式図である。図4において、表示装置200は、上記した表示装置100の構成に加えて、保護板1の液晶パネル2側の主面上に基材層21を更に有し、光源30は図示されていない。
図5(a)~(c)は、本発明の実施形態3に係る表示装置の構成を示す断面模式図である。図5(a)において、表示装置300は、上記した表示装置100の構成から保護層11b及び16aを除いた点で異なるが、それ以外の構成については表示装置100と同様の構成を有する。なお、光源30は図示されていない。
図6は、本実施形態に係る表示装置400の構成を示す断面模式図である。本実施形態に係る表示装置400は、図1に示す表示装置100において、更に、反射防止膜51、52、53を設けた構成である。
図7は、本発明の実施形態5に係る表示装置500の構成を示す断面模式図である。本実施形態に係る表示装置500は、図1に示す表示装置100において、液晶パネル2を支持基板3の側に接着した構成である。
図8は、本発明の実施形態6に係る表示装置600の構成を示す断面模式図である。本実施形態に係る表示装置600は、図1に示す表示装置100において、支持基板3を導光板60とし、この導光板60の側部に光源61を設けたサイドライト方式としたものである。
2 液晶パネル
3 支持基板
4 筐体
5、51~53 反射防止膜
6、12 円偏光板
7 赤外線遮蔽膜
8、13 偏光子
9、14 λ/4位相差板
10、15 直線偏光子
11a、11b、16a、16b 保護層
17 支持体
20、23 空気層
21 基材層
30 バックライト
60 導光板
61 光源
100、200、300、310、320、400、500、600 表示装置
Claims (12)
- 表示パネルと、該表示パネルよりも観察面側に配置された保護板とを備える表示装置であって、
該保護板は、該観察面側の主面上に、ナノ構造体が形成された低反射膜を備え、該表示パネルが配置された側の主面上に、該保護板側から該表示パネル側に向かって円偏光板及び赤外線遮蔽膜がこの順に配置されていることを特徴とする表示装置。 - 前記表示パネルは、非表示領域に遮光部材を有し、
前記赤外線遮蔽膜は、該遮光部材に対応する領域に形成されていることを特徴とする請求項1記載の表示装置。 - 前記赤外線遮蔽膜は、金属酸化物を含有することを特徴とする請求項1又は2記載の表示装置。
- 前記保護板と前記表示パネルとは、熱的に分離されていることを特徴とする請求項1~3のいずれかに記載の表示装置。
- 前記保護板は、面方向及び厚み方向の位相差が実質的にゼロである基材層を更に備え、
該基材層は、前記赤外線遮蔽膜よりも表示パネル側に配置されていることを特徴とする請求項1~4のいずれかに記載の表示装置。 - 前記円偏光板は、直線偏光子とλ/4位相差板とからなり、保護層を介して前記保護板に取り付けられていることを特徴とする請求項1~5のいずれかに記載の表示装置。
- 前記表示装置は、前記表示パネルの前記保護板が配置された側とは反対側に支持基板を更に備えることを特徴とする請求項1~6のいずれかに記載の表示装置。
- 前記表示装置は、前記表示パネルと前記支持基板との間に、ナノ構造体が形成された低反射膜を更に有することを特徴とする請求項7記載の表示装置。
- 前記表示装置は、前記表示パネルの前記保護板が配置された側とは反対側に光源を更に有することを特徴とする請求項1~8のいずれかに記載の表示装置。
- 前記表示パネルと前記支持基板とが接触していることを特徴とする請求項7~9のいずれかに記載の表示装置。
- 前記支持基板は、導光板であることを特徴とする請求項7~10のいずれかに記載の表示装置。
- 前記表示装置は、デジタルサイネージであることを特徴とする請求項1~11のいずれかに記載の表示装置。
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JP2011505811A JP4976587B2 (ja) | 2009-03-25 | 2009-11-18 | 表示装置 |
CN200980157763.4A CN102341837B (zh) | 2009-03-25 | 2009-11-18 | 显示装置 |
US13/138,492 US20110310470A1 (en) | 2009-03-25 | 2009-11-18 | Display device |
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PCT/JP2009/069548 WO2010109723A1 (ja) | 2009-03-25 | 2009-11-18 | 表示装置 |
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US (1) | US20110310470A1 (ja) |
JP (1) | JP4976587B2 (ja) |
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JPWO2010109723A1 (ja) | 2012-09-27 |
CN102341837B (zh) | 2014-04-02 |
US20110310470A1 (en) | 2011-12-22 |
CN102341837A (zh) | 2012-02-01 |
JP4976587B2 (ja) | 2012-07-18 |
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