WO2012081679A1

WO2012081679A1 - Front panel for display purposes, and display device

Info

Publication number: WO2012081679A1
Application number: PCT/JP2011/079095
Authority: WO
Inventors: 隆佳二連木; 智宏竹安; 角野　友信; 浩次新井; 本間　聡
Original assignee: 大日本印刷株式会社
Priority date: 2010-12-16
Filing date: 2011-12-15
Publication date: 2012-06-21
Also published as: JP6234658B2; JP2012189986A; TW201243443A

Abstract

[Problem] To provide a front panel for display purposes, which has high scratch resistance. [Solution] A front panel (40) for display purposes comprises a transparent substrate (20), a buffer layer (60) which is arranged directly on the observer side or the display part side of the transparent substrate (20), and an antireflective film (30) which is arranged on the buffer layer (60). The antireflective film (30) has, formed on the outermost layer thereof, a low-refractive-index layer (31). The low-refractive-index layer (31) has a lower light refractive index than that of the transparent substrate (20). The buffer layer (60) has a higher light refractive index than that of the low-refractive-index layer (31), and the buffer layer (60) has a larger thickness than that of the low-refractive-index layer (31).

Description

Display front plate and display device

The present invention relates to a display front plate disposed on an observer side with respect to a display unit. The present invention also relates to a display device including a display unit and a display front plate.

Conventionally, it has been known to provide a display front plate for protecting a display unit on the viewer side of a display unit such as a liquid crystal display (hereinafter also referred to as LCD) or a plasma display (hereinafter also referred to as PDP). ing. When the outermost surface of the display front plate is a transparent substrate such as a glass substrate, reflection occurs due to a difference in refractive index between the transparent substrate and the air interface.

For this reason, an antireflection film or an antireflection film may be installed on the outermost surface of the display front plate (see, for example, FIGS. 6B and 6C of Patent Document 1). This anti-reflective film is an anti-reflective material for base films such as TAC (cellulose triacetate flakes as the main raw material, methylene chloride as solvent, triphenyl phosphate as plasticizer) film and PET (polyethylene terephthalate) film. It consists of the thing which applied.

Here, a mode in which the antireflection film is attached to the transparent substrate will be described with reference to FIGS. 54 (a) to 54 (e). First, the transparent substrate 20 is prepared (see FIG. 54A). On the other hand, apart from the preparation of the transparent substrate 20, the roll-shaped base film 85 is spread (see FIG. 54B), and the antireflection material 30 ′ is coated on one surface of the base film 85. Then (see FIG. 54C), the antireflection material 30 ′ is dried and then exposed to prepare an antireflection film.

And the base film 85 is affixed on the transparent substrate 20 through adhesive layers, such as an adhesive agent and a tape (refer FIG.54 (d). In the figure, the said adhesive agent and tape are not described). Thereafter, the antireflection film protruding from the transparent substrate 20 is cut (see FIG. 54E).

In order to reduce the reflection of external light in the antireflection film or antireflection film, generally, a layer having a low light refractive index is used as a layer constituting the outermost surface of the antireflection film or antireflection film. In order to prevent light interference, the thickness of the antireflection film and the layers constituting the antireflection film is generally smaller than ¼ of the wavelength of visible light. For example, in Patent Document 2, as a layer constituting the outermost surface of the antireflection film, a low refractive index layer having a refractive index in the range of 1.20 to 1.55 and a thickness in the range of 50 to 200 nm is used. The example used is shown.

JP 2002-215056 A JP 2005-43749 A

The low refractive index layer located on the outermost surface of the antireflection film of the display front plate is required not only to have a low light refractive index but also to have high scratch resistance. However, generally, there is a trade-off relationship between reducing the optical refractive index of the material constituting the layer and increasing the scratch resistance of the material constituting the layer.

In addition, when an antireflection film is used as in Patent Document 1, an operation of applying the antireflection film to the transparent substrate 20 as described above occurs, and foreign matters and bubbles are generated when the antireflection film is applied to the transparent substrate 20. Risks such as contamination. Moreover, the transmittance | permeability will fall with the base film 85. FIG. In addition, when the antireflection film is used in this way, it is necessary to cut a portion protruding from the transparent substrate 20 in the surface direction, resulting in waste. Furthermore, since the base film 85 has undulations, the undulations make the appearance non-uniform.

It is an object of the present invention to provide a display front plate and a display device that can effectively solve such problems.

The present invention provides a display front plate disposed on the viewer side with respect to the display unit, a support member including at least a transparent substrate, and a buffer layer provided on the viewer side or the display unit side of the support member, An antireflective film provided on the buffer layer, the antireflective film has a low refractive index layer located on the outermost surface, and the light refractive index of the low refractive index layer is that of the support member The refractive index of the transparent substrate is smaller than the refractive index of the buffer layer, the refractive index of the buffer layer is larger than the refractive index of the low refractive index layer, and the thickness of the buffer layer is the low refractive index layer. It is the display front board characterized by being larger than the thickness of this.

According to the present invention, even when the scratch resistance of the low refractive index layer is low, the stress applied from the outside to the low refractive index layer can be relaxed by the buffer layer. As a result, it is possible to improve the scratch resistance of the entire laminate comprising the antireflection film and the buffer layer, thereby preventing the antireflection film from being damaged by external stress.

In the display front plate according to the present invention, preferably, the thickness of the low refractive index layer is in the range of 90 to 120 nm, and the thickness of the buffer layer is 0.5 μm or more. On the other hand, the Vickers hardness when the Vickers indenter is pushed in with a load of 5 mN is in the range of 50 to 100, and the ratio of the elastic deformation amount of the buffer layer to the total deformation amount of the buffer layer at that time is 0 .55 or more. More preferably, the Vickers hardness when the Vickers indenter is pushed into the buffer layer with a load of 5 mN is in the range of 60 to 90, and the buffer layer with respect to the total deformation amount of the buffer layer at that time The ratio of the amount of elastic deformation is 0.60 or more. By using such a buffer layer, it is possible to further improve the scratch resistance of the entire laminate comprising the antireflection film and the buffer layer.

In the display front plate according to the present invention, the buffer layer may be provided directly on the observer side of the transparent substrate of the support member.

In the display front plate according to the present invention, preferably, the light refractive index of the low refractive index layer is smaller than 1.35.

In the display front plate according to the present invention, the low refractive index layer may include a binder resin portion and a plurality of hollow fillers dispersed in the binder resin portion.

In the display front plate according to the present invention, the antireflection film provided on the buffer layer provided on the observer side of the transparent substrate of the support member is provided on the display unit side of the low refractive index layer. Further, a high refractive index layer may be further included. In this case, the light refractive index of the high refractive index layer is larger than the light refractive index of the transparent substrate of the support member.

In the display front plate according to the present invention, preferably, the absolute value of the difference between the light refractive index of the buffer layer and the light refractive index of the transparent substrate of the support member is 0.03 or less.

The display front plate according to the present invention may further include an additional buffer layer provided on the display unit side of the support member, and an additional antireflection film provided on the display unit side of the additional buffer layer. . In this case, the additional antireflection film has an additional low refractive index layer positioned on the outermost surface on the display unit side, and the optical refractive index of the additional low refractive index layer is the optical refractive index of the transparent substrate of the support member. And the thickness of the additional low refractive index layer is in the range of 90 to 120 nm, the thickness of the additional buffer layer is 0.5 μm or more, and 5 mN relative to the additional buffer layer. The Vickers hardness when the Vickers indenter is pushed in with a load of 50 to 100 is in the range of 50 to 100, and the ratio of the elastic deformation amount of the additional buffer layer to the total deformation amount of the additional buffer layer at that time is 0. 55 or more.

The display front plate according to the present invention may further include an additional antireflection film provided on the display portion side of the support member. In this case, the additional antireflection film has an additional low refractive index layer located on the outermost surface on the display unit side, and the optical refractive index of the additional low refractive index layer is the light refraction of the transparent substrate of the support member. Smaller than the refractive index and larger than the optical refractive index of the low refractive index layer of the antireflection film, and the thickness of the additional low refractive index layer is in the range of 90 to 120 nm.

In the display front plate according to the present invention, the additional antireflection film may further include an additional high refractive index layer provided on an observer side of the additional low refractive index layer. In this case, the optical refractive index of the additional high refractive index layer is larger than the optical refractive index of the transparent substrate of the support member.

In the display front plate according to the present invention, the buffer layer may be provided directly on the display portion side of the transparent substrate of the support member. At this time, the antireflection film provided on the buffer layer may further include a high refractive index layer provided on the observer side of the low refractive index layer. In this case, the light refractive index of the high refractive index layer is larger than the light refractive index of the transparent substrate of the support member. Preferably, the absolute value of the difference between the light refractive index of the buffer layer and the light refractive index of the transparent substrate of the support member is 0.03 or less.

The display front plate according to the present invention may further include a touch panel sensor including a sensor unit.

In the display front plate according to the present invention, the sensor unit may be formed on the surface of the support member on the observer side or the surface of the display unit.

In the display front plate according to the present invention, a signal processing unit may be connected to the sensor unit.

The display front plate according to the present invention may further include a polarizing plate positioned closer to the display unit than the transparent substrate of the support member.

The display front plate according to the present invention may further include a color filter positioned closer to the display unit than the transparent substrate of the support member.

The display front plate according to the present invention may further include an observer-side adhesive layer provided on the observer side of the antireflection film.

The display front plate according to the present invention may further include a protective layer provided on the observer side of the observer-side adhesive layer.

The display front plate according to the present invention may further include a display unit side adhesive layer located on the outermost surface on the display unit side.

The present invention comprises: a display unit that emits light for displaying an image to the viewer side; and a display front plate disposed on the viewer side with respect to the display unit, wherein the display front plate is A buffer layer provided on the observer side or the display unit side of the support member including at least the transparent substrate, and an antireflection film provided on the buffer layer, and the antireflection film is located on the outermost surface. A low refractive index layer, wherein the light refractive index of the low refractive index layer is smaller than the light refractive index of the transparent substrate of the support member, and the light refractive index of the buffer layer is the low refractive index layer And the thickness of the buffer layer is larger than the thickness of the low refractive index layer.

In the display device according to the present invention, the display unit may include a touch panel sensor including a sensor unit.

In the display device according to the present invention, the display unit may further include a color filter.

In the display device according to the present invention, the touch panel sensor may be formed integrally with the color filter.

In the display device according to the present invention, the display front plate may include a touch panel sensor including a sensor unit.

In the display device according to the present invention, the sensor unit may be formed on a viewer side surface or a display unit side surface of the transparent substrate of the support member of the display front plate.

According to the present invention, a display front plate having high scratch resistance can be provided.

FIG. 1 is a cross-sectional view showing a display device according to a first embodiment of the present invention. FIG. 2 is a view showing a method for manufacturing the display front plate according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining the total deformation amount and elastic deformation amount of the buffer layer. 4A and 4B are views showing a state in which the pressing body is pushed into the display front plate according to the first embodiment of the present invention. 5A (a) and 5 (b) are views showing a state in which the pressing body is pushed into the display front plate according to the first comparative embodiment. FIGS. 5B (a) and 5 (b) are views showing a state in which the pressing body is pushed into the display front plate according to the second comparative embodiment. FIG. 6 is an enlarged view showing a low refractive index layer of the antireflection film in the display front plate according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a display device according to a third embodiment of the present invention. FIG. 8 is a sectional view showing a display device according to a fourth embodiment of the present invention. FIG. 9 is a sectional view showing a display device according to a modification of the fourth embodiment of the present invention. FIG. 10 is a cross-sectional view illustrating an example of a display device including a design portion. FIG. 11 is a cross-sectional view showing a display front plate according to a fifth embodiment of the present invention. 12 is a cross-sectional view showing an example in which the display front plate shown in FIG. 11 further includes a protective layer. FIG. 13: is sectional drawing which shows the display front board by the modification of the 5th Embodiment of this invention. FIG. 14 is a cross-sectional view showing a display front plate according to a sixth embodiment of the present invention. FIG. 15 is a cross-sectional view showing a display front plate according to a modification of the sixth embodiment of the present invention. FIG. 16 is a cross-sectional view showing a display device according to a seventh embodiment of the present invention. 17 is a cross-sectional view illustrating an example in which the display device illustrated in FIG. 16 further includes an adhesive layer. FIG. 18A is a plan view illustrating an example of a touch panel sensor. 18B is a cross-sectional view of the touch panel sensor of FIG. 18A viewed from the XVIIIB-XVIIIB direction. 18C is a cross-sectional view of the touch panel sensor of FIG. 18A viewed from the XVIIIC-XVIIIC direction. 19 is a cross-sectional view illustrating an example in which the touch panel sensor illustrated in FIG. 16 includes a signal processing unit. 20 is a cross-sectional view illustrating an example in which the touch panel sensor illustrated in FIG. 17 includes a signal processing unit. FIG. 21 is a sectional view showing a display device according to an eighth embodiment of the present invention. FIG. 22 is a cross-sectional view showing an LCD panel of a display unit. FIG. 23 is a cross-sectional view showing an example in which the display device shown in FIG. 21 further includes an optical compensation film. FIG. 24 is a diagram showing an example of an intermediate product used for forming a display device. FIG. 25 is a diagram illustrating an example of an intermediate product used to form a display device. FIG. 26 is a diagram illustrating an example of an intermediate product used for forming a display device. 27 is a cross-sectional view showing a modification of the display device shown in FIG. 28 is a cross-sectional view showing a modification of the display device shown in FIG. 29 is a cross-sectional view showing a modification of the intermediate product shown in FIG. 30 is a cross-sectional view showing a modification of the intermediate product shown in FIG. 31 is a cross-sectional view showing a modification of the intermediate product shown in FIG. FIG. 32 is a cross-sectional view showing an example of a touch panel sensor integrated color filter. 33 is a cross-sectional view showing a display device including the touch panel sensor integrated color filter shown in FIG. FIG. 34 is a cross-sectional view showing a display device according to a ninth embodiment of the present invention. FIG. 35 is a diagram showing an example of an intermediate product used for forming a display device. FIG. 36 is a sectional view showing a display front plate according to the tenth embodiment of the present invention. FIG. 37 is a cross-sectional view illustrating an example of a display device including a display front plate having a touch panel sensor. FIG. 38 is a sectional view showing a display front plate according to a modification of the tenth embodiment of the present invention. FIG. 39 is a sectional view showing a display front plate according to a modification of the tenth embodiment of the present invention. FIG. 40 is a cross-sectional view showing a display front plate according to a modification of the tenth embodiment of the present invention. 41 is a cross-sectional view showing an example in which the display front plate shown in FIG. 36 further includes a polarizing plate. FIG. 42 is a cross-sectional view showing an example in which the display front plate shown in FIG. 41 further has a color filter. FIG. 43 is a cross-sectional view showing a display front plate formed integrally with a sensor portion in an eleventh embodiment of the present invention. 44 is a cross-sectional view showing an example in which the display front plate shown in FIG. 43 further has an adhesive layer. FIG. 45 is a cross-sectional view showing an example in which the display front plate shown in FIG. 43 further has a signal processing unit. FIG. 46 is a cross-sectional view showing an example in which the display front plate shown in FIG. 44 further has a signal processing unit. 47 is a cross-sectional view showing an example in which the display front plate shown in FIG. 45 further includes a polarizing plate. FIG. 48 is a cross-sectional view showing an example in which the display front plate shown in FIG. 47 further has a color filter. FIG. 49 is a cross-sectional view showing a display device according to a modification of the first embodiment of the present invention. FIG. 50 is a sectional view showing a display device according to a modification of the third embodiment of the present invention. FIG. 51A is a cross-sectional view showing a display front plate according to a modification of the eleventh embodiment of the present invention. FIG. 51B is a cross-sectional view showing one embodiment of the sensor portion and the buffer layer of the display front plate shown in FIG. 51A. FIG. 52A is a cross-sectional view showing an example in which the support member further includes an invisible layer provided on the transparent substrate. FIG. 52B is a cross-sectional view showing an example in which the support member further includes a guard layer provided on the transparent substrate. FIG. 53 is a diagram showing an evaluation result of scratch resistance in an additional example. FIG. 54 is a cross-sectional view showing a method for manufacturing a display front plate using an antireflection film.

First Embodiment Hereinafter, a first embodiment of a display front plate according to the present invention will be described with reference to FIG. 1 and FIG. First, the entire display device 70 including the display front plate 40 will be described.

Display Device As shown in FIG. 1, the display device 70 includes a display unit 50 that generates light for displaying an image and emits the generated light toward an observer, such as an LCD, a PDP, and an organic EL. The display front plate 40 is disposed on the viewer side with respect to the display unit 50. The display unit 50 and the display front plate 40 may be partitioned into a display area for displaying an image and a non-display area located at the periphery of the display area.

Display Front Plate The display front plate 40 is provided to protect the display unit 50. The display front plate 40 includes a transparent substrate 20 having a substantially rectangular shape, a buffer layer 60 provided on the observer side of the transparent substrate 20, and an antireflection film 30 provided on the observer side of the buffer layer 60. It is equipped with. The transparent substrate 20 functions as a protective member that protects the display unit 50 and also functions as a support member that supports the buffer layer 60. As shown in FIG. 1, in the display front plate 40, the antireflection film 30 is the outermost layer (film) on the viewer side.

In the present specification, the terms “layer” and “film” are not distinguished from each other only based on the difference in names. Therefore, for example, “film” is a concept including members and parts that can also be called layers.

Hereinafter, each element constituting the display front plate 40 will be described in detail.

(Transparent substrate)
First, the transparent substrate 20 will be described. The material of the transparent substrate 20 is not particularly limited as long as the light from the display unit 50 can be extracted to the outside. For example, glass, polymer, or the like is used as a material for the transparent substrate 20 in consideration of light transmittance, durability, and the like. In the present embodiment, glass is used as the material of the transparent substrate 20, and its optical refractive index is, for example, 1.50. The thickness of the transparent substrate 20 is appropriately set according to the strength required for the display front plate 40, the dimensions of the display unit 50, and the like, but is in the range of 0.1 to 1.5 mm, for example. In this specification, the light refractive index is the refractive index for light having a wavelength of 550 nm. The method for measuring the refractive index is not particularly limited, and examples thereof include a method of calculating from a spectral reflection spectrum, a method of measuring using an ellipsometer, and an Abbe method.
An example of the ellipsometer is UVSEL manufactured by Joban-Evon.
The refractive index in this case is a value measured with DF1030R manufactured by Techno Synergy.
The thickness specified in this specification is a thickness obtained by a general measurement method. For example, as a method for measuring the thickness, there are a stylus type method for calculating the thickness by tracing the surface with a stylus and detecting an unevenness, an optical method for calculating the thickness based on the spectral reflection spectrum, and the like. it can. For example, in an additional example to be described later, the thickness was measured using a stylus film thickness meter P-15 manufactured by KLA-Tencor Corporation. In addition, as a thickness prescribed | regulated in this specification, the average value of the thickness measurement result in several places of the member used as object may be used.

(Antireflection film)
Next, the antireflection film 30 will be described. The antireflection film 30 is a film provided to reduce reflection of external light on the outermost surface on the viewer side of the display device 70. As shown in FIG. 1, the antireflection film 30 has a low refractive index layer 31 located on the outermost surface on the viewer side.

The light refractive index of the low refractive index layer 31 is smaller than the light refractive index of the transparent substrate 20 in order to reduce reflection of external light in the antireflection film 30. In the present embodiment, the light refractive index of the low refractive index layer 31 is smaller than 1.50 which is the light refractive index of the transparent substrate 20 made of glass, and preferably smaller than 1.35. Yes. Thereby, reflection of external light in the antireflection film 30 can be reduced.

The material constituting such a low refractive index layer 31 is not particularly limited as long as it has optical transparency and a desired optical refractive index is realized, and a known material is used. For example, as the material of the low refractive index layer 31, a fluororesin such as polychlorotrifluoroethylene (PCTFE), polytetrafluoroethylene (PTFE), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), or the like is used. it can. Further, as the low refractive index layer 31, a low refractive index layer containing a fluorine-containing vinyl monomer polymerization unit and a polymerization unit having an ethylenically unsaturated group in the side chain as disclosed in JP-A-2005-43749 is used. May be.

In order to prevent light interference, the thickness of the low refractive index layer 31 is substantially smaller than ¼ of the wavelength of visible light. For example, the thickness of the low refractive index layer 31 is in the range of 90 to 120 nm. This can prevent light interference in the low refractive index layer 31.

(Buffer layer)
Next, the buffer layer 60 will be described. The buffer layer 60 is provided to relieve the stress when an external stress is applied to the low refractive index layer 31 of the antireflection film 30. The buffer layer 60 has a predetermined elastic deformation characteristic and a predetermined hardness. For this reason, while the stress is applied to the low refractive index layer 31, the buffer layer 60 is elastically deformed so that the stress applied to the low refractive index layer 31 can be appropriately relaxed, and the stress is removed. After that, the shape of the buffer layer 60 is elastically restored to the original shape, whereby the shape of the low refractive index layer 31 can be substantially restored. Thereby, it is possible to prevent the low refractive index layer 31 from being broken and the low refractive index layer 31 from being left depressed.

In order to provide the above function to the buffer layer 60, the light refractive index of the buffer layer 60 is set to be larger than the light refractive index of the low refractive index layer 31 of the antireflection film 30. As described above, generally, there is a trade-off relationship between reducing the optical refractive index of the material constituting the layer and increasing the scratch resistance of the material constituting the layer. Therefore, the buffer layer 60 is configured such that the light refractive index of the buffer layer 60 is larger than the light refractive index of the low refractive index layer 31, thereby providing the buffer layer 60 with greater scratch resistance than the low refractive index layer 31. can do. As a result, the low refractive index layer 31 can be prevented from being broken, and the low refractive index layer 31 can be kept from being depressed.

Moreover, in order to provide the above-mentioned function to the buffer layer 60, the thickness of the buffer layer 60 is preferably 0.5 μm or more, more preferably 1 μm or more. Thus, by making the thickness of the buffer layer 60 sufficiently larger than the thickness of the low refractive index layer 31, the stress applied to the low refractive index layer 31 can be moderated appropriately.

Further, the Vickers hardness when the Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN is preferably in the range of 50 to 100, more preferably in the range of 60 to 90. Thereby, an appropriate strength can be imparted to the buffer layer 60. In the present embodiment, the Vickers hardness is a Vickers hardness defined in JIS Z 2244, and is measured, for example, as follows.

First, a buffer layer 60 having a thickness of 2.5 μm is provided on a suitable substrate, for example, a glass plate having a thickness of 1.1 mm. Next, a Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN. At this time, the loading time, holding time, and weight loss time of the Vickers indenter are, for example, 20 seconds, 5 seconds, and 20 seconds, respectively. Then, the area of the dent formed in the buffer layer 60 is measured. Such measurement is performed a plurality of times, for example, three times, and the Vickers hardness of the buffer layer 60 is calculated based on the average value of the measured area of the recesses.

Furthermore, the ratio of the elastic deformation amount of the buffer layer 60 to the total deformation amount of the buffer layer 60 when the Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN as described above is 0.55 or more. More preferably, it is 0.60 or more. Thereby, it is possible to prevent the low refractive index layer 31 from being broken and the low refractive index layer 31 from being left depressed. In the present embodiment, the “ratio of elastic deformation” is calculated as follows.

When the Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN, the buffer layer 60 is deformed by drawing a hysteresis curve (indentation load-deformation amount) as shown in FIG. As shown in FIG. 3, after the buffer layer 60 is deformed from the initial point O ₁ where the indentation load is “0” to the intermediate point O ₂ where the indentation load is 5 mN, a predetermined distance from the intermediate point O ₂ to the intermediate point O ₃ is obtained. The indentation load of 5 mN is held for the holding time, and then the indentation load is released. Thereby, finally, the deformation amount of the buffer layer 60 reaches the final point O ₄ . At this time, if the buffer layer 60 is a complete elastic body, the deformation amount of the final point O ₄ is “0”, but actually the buffer layer 60 is not a complete elastic body, and at the final point O ₄ . The amount of deformation remains as a positive amount. This amount is the amount of plastic deformation. If the amount of deformation at the time when the indentation by the Vickers indenter is finished (intermediate point O ₃ ) is the total amount of deformation, the amount obtained by subtracting the amount of plastic deformation from this total amount of deformation The amount of elastic deformation. Using the respective deformation amounts thus defined, the “ratio of elastic deformation amount” is defined as (elastic deformation amount) / (total deformation amount).

The measuring device for measuring the above-mentioned Vickers hardness, total deformation amount, and elastic deformation amount in the buffer layer 60 is not particularly limited. For example, a microhardness meter (device name: Fisherscope H-100 Fisher Instruments Co., Ltd.) is used as the measuring device. Made). The Vickers indenter, measuring instrument, and analysis software included in the measuring device are, for example, as follows.
Indenter: Diamond pyramid indenter (tip facing angle 136 °)
Measuring instrument: HU-100 (Fisher Instruments Inc.)
Analysis software: WIN-HCU (Fisher Instruments Inc.)
Based on the result of evaluating the physical properties of the buffer layer 60 using such a measuring device, the ratio of the elastic deformation amount and the Vickers hardness are calculated by the analysis software.

Preferably, the light refractive index of the buffer layer 60 is set so that the absolute value of the difference from the light refractive index of the transparent substrate 20 is 0.03 or less. For example, when glass having an optical refractive index of 1.50 is used as the transparent substrate 20, the optical refractive index of the buffer layer 60 is set within a range of 1.47 to 1.53. Accordingly, it is possible to prevent light from being reflected at the interface between the buffer layer 60 and the transparent substrate 20.

The material of the buffer layer 60 is selected so as to have a predetermined light transmittance and satisfy the above-described characteristics. For example, an acrylic resin, an epoxy resin, a novolac resin, or the like is used as a material for the buffer layer 60. Among these, examples of the acrylic resin include urethane acrylate, epoxy acrylate, polyester acrylate, polyol acrylate, polyether acrylate, and melamine acrylate.

The method for obtaining the resin used as the material of the buffer layer 60 is not particularly limited. For example, it can be obtained by blending a photopolymerization initiator with an organic material such as a monomer, oligomer, or polymer that can form the resin. For example, a urethane acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting the resulting product with an acrylate or methacrylate monomer having a hydroxyl group. Moreover, as a photoinitiator, a benzophenone derivative, an acetophenone derivative, an anthraquinone derivative etc. are used individually or in combination, for example.

Next, the operation and effect of the present embodiment having such a configuration will be described. First, a method for manufacturing the display front plate 40 and the display device 70 will be described.

Method for Manufacturing Display Front Plate First, a transparent substrate 20 is prepared (see FIG. 2A).

Next, the buffer layer 60 is formed on the observer side of the transparent substrate 20 (the upper side in FIG. 2B). At this time, a specific method for forming the buffer layer 60 is not particularly limited.
For example, the buffer layer 60 can be formed by applying a coating solution containing a material for the buffer layer 60 onto the transparent substrate 20. At this time, the coating solution may be applied over the entire area of the transparent substrate 20 by a wet method such as a die coating method, a spin coating method, or a dip coating method, or may be applied in a spot shape on the transparent substrate 20 by an inkjet method. Also good. As a coating method, a known printing method such as gravure printing, offset printing, silk screen printing, or the like may be used. In addition, a coating liquid is comprised by mixing solid content which consists of the material for the above-mentioned buffer layers 60, and a suitable solvent. The ratio of the solid content to the entire coating solution is appropriately set depending on the coating method, but is preferably in the range of 5 to 30% by weight, and more preferably about 20% by weight.
Alternatively, a sheet-like or film-like buffer layer 60 may be prepared and attached to the transparent substrate 20 via an adhesive layer such as an adhesive or a tape. In this case, the buffer layer 60 protruding from the transparent substrate 20 may be appropriately cut.
In addition, when the buffer layer 60 is formed by apply | coating the coating liquid containing the material for the buffer layer 60 on the transparent substrate 20, the buffer layer 60 is directly provided on the surface of the observer side of the transparent substrate 20. Will be. Here, “directly” means that the buffer layer 60 is at least partially in contact with the surface of the transparent substrate 20.

Thereafter, the low refractive index layer 31 is formed on the observer side of the buffer layer 60 (see FIG. 2C). Thereby, the antireflection film 30 made of the low refractive index layer 31 is formed on the observer side of the buffer layer 60. At this time, the specific method for forming the low refractive index layer 31 is not particularly limited.
For example, the low refractive index layer 31 can be formed by applying a coating solution containing a material for the low refractive index layer 31 on the buffer layer 60. At this time, the coating solution may be applied over the entire area of the buffer layer 60 by a wet method such as a die coating method, a spin coating method, or a dip coating method, or is applied to the buffer layer 60 in a dot shape by an inkjet method. Also good. As a coating method, a known printing method such as gravure printing, offset printing, silk screen printing, or the like may be used. As in the case of the buffer layer 60, the coating solution is configured by mixing a solid content made of the material for the low refractive index layer 31 and an appropriate solvent. The ratio of the solid content with respect to the entire coating solution is appropriately set depending on the coating method, but is preferably in the range of 0.5 to 10% by weight, more preferably in the range of 1 to 5% by weight. It has become.
Alternatively, a sheet-like or film-like low refractive index layer 31 may be prepared and attached to the buffer layer 60 through an adhesive layer such as an adhesive or a tape. In this case, the low refractive index layer 31 protruding from the transparent substrate 20 may be appropriately cut.
When the low refractive index layer 31 is formed by applying a coating liquid containing a material for the low refractive index layer 31 on the buffer layer 60, the low refractive index layer 31 is provided directly on the buffer layer 60. Will be. Here, “directly” means that the low refractive index layer 31 is at least partially in contact with the surface of the buffer layer 60.

When the buffer layer 60 or the low refractive index layer 31 is formed by a wet method, the buffer layer 60 or the low refractive index layer 31 is exposed after being dried, heated after being dried, or dried. Then, it is cured by being exposed and heated, or only dried.
In general, when the material for the buffer layer 60 or the material for the low refractive index layer 31 contains an ultraviolet curable resin, curing is achieved by exposing the buffer layer 60 or the low refractive index layer 31. In addition, the patternability based on exposure and development may be implement | achieved by using the photomask which has a predetermined pattern in the case of exposure. Thereby, a predetermined pattern can be applied to the buffer layer 60 or the low refractive index layer 31.
Moreover, when the thermosetting resin is contained in the material for the buffer layer 60 or the material for the low refractive index layer 31, curing is achieved by heating the buffer layer 60 or the low refractive index layer 31.

As described above, the transparent substrate 20, the buffer layer 60 provided on the observer side of the transparent substrate 20, and the antireflection film 30 provided on the observer side of the buffer layer 60 are provided before display. The face plate 40 is manufactured.

The display device 70 is manufactured by arranging and attaching the display front plate 40 thus manufactured to the viewer side of the display unit 50 (see FIG. 1).

Next, the effect of this embodiment will be described in comparison with a comparative embodiment. FIGS. 4A and 4B are diagrams for explaining the effect of the present embodiment, and are diagrams showing a state in which the pressing body 80 is pushed into the display front plate 40 according to the present embodiment. FIGS. 5A (a) and 5 (b) are views showing a state in which the pressing body 80 is pushed into the display front plate 90 according to the first comparative embodiment, and FIGS. 5B (a) and 5 (b) show the second comparison. It is a figure which shows a mode that the press body 80 is pushed in into the display front board 95 by the form.

First Comparison Mode First, a display front plate 90 according to a first comparison mode will be described with reference to FIGS. 5A (a) and 5 (b). The display front plate 90 according to the first comparative embodiment is different only in that the buffer layer 60 is not provided, and the other configuration is the display front plate according to the present embodiment shown in FIGS. 1 and 2. 40.

FIG. 5A (a) is a diagram showing the display front plate 90 in a state where the pressing body 80 is pushed in, and FIG. 5A (b) shows the display front plate 90 after the pressing body 80 is removed. FIG. As shown in FIGS. 5A (a) and 5 (b), the display front plate 90 is not provided with the buffer layer 60. In general, the transparent substrate 20 is made of a hard material such as glass. For this reason, the stress applied to the low refractive index layer 31 from the pressing body 80 is not relieved, and therefore, as shown in FIGS. 5A (a) and 5 (b), the fracture portion 91 is formed in the low refractive index layer 31. Can be considered.

Second Comparison Mode Next, a display front plate 95 according to a second comparison mode will be described with reference to FIGS. 5B (a) and 5 (b). In the display front plate 95 according to the second comparative embodiment, the ratio of the Vickers hardness and the amount of elastic deformation of the buffer layer 97 of the display front plate 95 is the buffer layer 60 of the display front plate 40 according to the present embodiment. It is smaller than the ratio of the Vickers hardness and the amount of elastic deformation.

5B (a) is a diagram showing the display front plate 95 in a state where the pressing body 80 is pushed in, and FIG. 5B (b) shows the display front plate 95 after the pressing body 80 is removed. FIG. As shown in FIG. 5B (a), the display front plate 95 is provided with a buffer layer 97. Therefore, the stress applied from the pressing body 80 to the low refractive index layer 31 can be relaxed. However, the ratio of the Vickers hardness and the amount of elastic deformation of the buffer layer 97 is smaller than the ratio of the Vickers hardness and the amount of elastic deformation of the buffer layer 60 of the display front plate 40 according to the present embodiment. For this reason, after the pressing body 80 is removed, the shape of the buffer layer 97 is not restored, and the recess 96 is formed in the buffer layer 97 and the low refractive index layer 31 as shown in FIG. 5B (b). It remains.

According to the present embodiment with respect to this in the present embodiment, as described above, the buffer layer 60 is interposed between the low refractive index layer 31 of the antireflection film 30 and the transparent substrate 20 . The buffer layer 60 has a thickness of 0.5 μm or more. Further, the Vickers hardness when the Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN is in the range of 50 to 100, and the buffer layer 60 with respect to the total deformation amount of the buffer layer 60 at that time. The ratio of the amount of elastic deformation is 0.55 or more. For this reason, as shown to Fig.4 (a), the stress applied to the low-refractive-index layer 31 from the press body 80 can be relieve | moderated appropriately by the buffer layer 60. FIG. Further, as shown in FIG. 4B, after the pressing body 80 is removed, the shape of the buffer layer 60 is elastically almost restored. Thus, the size of the recess 41 formed in the low refractive index layer 31 after the pressing body 80 is removed can be minimized.

Further, according to the present embodiment, the optical refractive index of the buffer layer 60 is set so that the absolute value of the difference from the optical refractive index of the transparent substrate 20 is 0.03 or less. Accordingly, it is possible to suppress an increase in light reflection due to the provision of the buffer layer 60 between the low refractive index layer 31 of the antireflection film 30 and the transparent substrate 20.

In the display front plate 40 according to the present embodiment, an example is shown in which the buffer layer 60 is provided on the observer side of the transparent substrate 20 and the antireflection film 30 is provided on the observer side of the buffer layer 60. It was. However, the present invention is not limited to this, and as shown in FIG. 49, the buffer layer 60 is provided on the display unit side of the transparent substrate 20, and the antireflection film 30 is provided on the display unit 50 side of the buffer layer 60. Also good. In this case, as shown in FIG. 49, the low refractive index layer 31 of the antireflection film 30 is located on the outermost surface of the antireflection film 30 on the display unit 50 side. The “observer side” means a surface facing the observer when the display front plate 40 is arranged with respect to the display unit 50. The “display unit side” means a surface facing the display unit 50 when the display front plate 40 is arranged with respect to the display unit 50.

According to the present modification, the antireflection film 30 of the display front plate 40 can prevent light from the display unit 50 from being reflected on the display unit 50 side of the display front plate 40, and as a result, the display The light transmittance in the front plate 40 can be improved. Further, the stress applied to the low refractive index layer 31 of the antireflection film 30 during the manufacturing process of the display device 70 can be appropriately relaxed by the buffer layer 60. Thereby, the antireflection film 30 can be prevented from being damaged.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged view showing the low refractive index layer 31 of the antireflection film 30 in the display front plate 40 according to the second embodiment of the present invention.

As shown in FIG. 6, in the present embodiment, the low refractive index layer 31 includes a binder resin portion 31a and a plurality of hollow fillers 31b dispersed in the binder resin portion 31a. The hollow filler 31b is filled with air or the like. For this reason, the optical refractive index of the low refractive index layer 31 as a whole is lower than that when the low refractive index layer 31 is composed only of the binder resin portion 31a. It has become.

Although the material of the binder resin portion 31a is not particularly limited, for example, the fluororesin mentioned as the material of the low refractive index layer 31 in the above-described first embodiment is appropriately used. As the hollow filler 31b, hollow glass beads or the like are used.

Preferably, the volume ratios of the binder resin portion 31a and the hollow filler 31b in the low refractive index layer 31 are appropriately set so that the light refractive index of the low refractive index layer 31 as a whole is smaller than 1.35. Here, the optical refractive index of the low refractive index layer 31 as a whole is obtained by multiplying the optical refractive index of the binder resin portion 31a by the volume ratio of the binder resin portion 31a and the optical refractive index of the hollow filler 31b. It is derived by adding the value calculated by multiplying the volume ratio of the hollow filler 31b.

According to the present embodiment, the low refractive index layer 31 includes a binder resin portion 31a and a plurality of hollow fillers 31b dispersed in the binder resin portion 31a. For this reason, the optical refractive index as the low refractive index layer 31 whole can be made lower. As a result, the effect of the antireflection film 30 preventing reflection of external light can be further enhanced.

Further, according to the present embodiment, the buffer layer 60 is interposed between the low refractive index layer 31 of the antireflection film 30 and the transparent substrate 20. For this reason, even when the low refractive index layer 31 having low scratch resistance such as the hollow filler 31b is used, the buffer layer 60 relieves stress applied to the low refractive index layer 31 from the outside. be able to. This can prevent the antireflection film 30 from being damaged by external stress.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a display device according to the third embodiment of the present invention.

The third embodiment shown in FIG. 7 is different only in that the antireflection film further includes a high refractive index layer provided on the display unit side of the low refractive index layer. Or substantially the same as that of the first embodiment shown in FIGS. In the third embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1 to 4 (a) and (b) are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 7, the antireflection film 30 includes a low refractive index layer 31 located on the outermost surface on the viewer side, a high refractive index layer 32 provided on the display unit 50 side of the low refractive index layer 31, and Is included. The optical refractive index of the high refractive index layer 32 is larger than the optical refractive indexes of the transparent substrate 20 and the low refractive index layer 31. By providing such a high refractive index layer 32, the effect of the antireflection film 30 preventing reflection of external light can be further enhanced.

The optical refractive index of the high refractive index layer 32 is not particularly limited as long as it is higher than the optical refractive indexes of the transparent substrate 20 and the low refractive index layer 31, but is in the range of 1.55 to 2.20, for example. . As a material constituting the high refractive index layer 32, a known material having a high light refractive index can be used, and for example, a material as disclosed in JP-A-2005-43749 can be used. The thickness of the high refractive index layer 32 is in the range of 20 to 300 nm, for example.

In the present embodiment, the example in which the antireflection film 30 includes the low refractive index layer 31 and the high refractive index layer 32 is shown, but the present invention is not limited to this. As long as the low refractive index layer 31 is located on the outermost surface of the antireflection film 30 on the viewer side, the antireflection film 30 may include other various layers. For example, a medium refractive index layer (not shown) having a light refractive index larger than the light refractive index of the low refractive index layer 31 and smaller than the light refractive index of the high refractive index layer 32 is used. It may be provided on the display unit 50 side. Furthermore, an undercoat layer, a hard coat layer, or the like may be provided on the outermost surface of the antireflection film 30 on the display unit 50 side.

Modification Also in the display front plate 40 according to the present embodiment, as in the modification of the first embodiment shown in FIG. 49, the buffer layer 60 is provided on the display unit side of the transparent substrate 20, The antireflection film 30 may be provided on the display unit 50 side of the buffer layer 60. In this case, as shown in FIG. 50, the high refractive index layer 32 of the antireflective film 30 is provided on the observer side of the low refractive index layer 31. By providing such a high refractive index layer 32, the effect of preventing the reflection of light from the display unit 50 by the antireflection film 30 can be further enhanced.

Fourth Embodiment Next, the fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view showing a display device according to the fourth embodiment of the present invention.

In the fourth embodiment shown in FIG. 8, the display front plate includes an additional buffer layer provided on the display unit side of the transparent substrate, an additional antireflection film provided on the display unit side of the additional buffer layer, The other configuration is substantially the same as that of the first embodiment shown in FIGS. 1 to 4A and 4B. In the fourth embodiment shown in FIG. 8, the same parts as those in the first embodiment shown in FIGS. 1 to 4 (a) and (b) are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 8, the display front plate 40 includes a buffer layer 60 provided on the observer side of the transparent substrate 20, an antireflection film 30 provided on the observer side of the buffer layer 60, and the transparent substrate 20. The additional buffer layer 65 provided on the display unit 50 side, and the additional antireflection film 35 provided on the display unit 50 side of the additional buffer layer 65 are provided. Among these, the additional antireflection film 35 has an additional low refractive index layer 36 located on the outermost surface on the display unit 50 side. The additional buffer layer 65, the additional antireflective film 35, and the additional low refractive index layer 36 are substantially the same as the buffer layer 60, the antireflective film 30, and the low refractive index layer 31 in the first embodiment. Is omitted.

Thus, in the present embodiment, the additional antireflection film 35 is provided not only on the observer side of the transparent substrate 20 but also on the display unit 50 side. For this reason, the display front plate 40 not only prevents external light from being reflected on the viewer side of the display front plate 40, but also the light from the display unit 50 on the display unit 50 side of the display front plate 40. It can prevent reflection. Further, the additional buffer layer 65 is interposed between the transparent substrate 20 and the additional antireflection film 35, whereby the additional antireflection film 35 can be prevented from being damaged.

In this embodiment, the antireflection film 30 is composed of only the low refractive index layer 31 and the additional antireflection film 35 is composed of only the additional low refractive index layer 36. However, the present invention is not limited to this, and the antireflection film 30 or the additional antireflection film 35 may include other various layers as in the case of the third embodiment described above. For example, as shown in FIG. 9, a high refractive index layer 32 having a light refractive index larger than the light refractive index of the low refractive index layer 31 may be provided on the display unit 50 side of the low refractive index layer 31. Further, an additional high refractive index layer 37 having a light refractive index larger than that of the additional low refractive index layer 36 may be provided on the viewer side of the additional low refractive index layer 36.

In other modified examples and in each of the above-described embodiments, a design layer for improving design properties may be appropriately formed. For example, as shown in FIG. 10, the design layer 10 may be formed in a non-display area on the viewer side of the display front plate 40.

In each of the above embodiments, although not shown, a hard coat layer or an undercoat layer for protecting the transparent substrate 20 or the buffer layer 60 may be provided between the transparent substrate 20 and the buffer layer 60. Good.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIGS. 11 to 13 differs only in that the display front plate further has an adhesive layer, and the other configurations are the first shown in FIGS. 1 to 4A and 4B. This is substantially the same as the embodiment. In the fifth embodiment shown in FIG. 11 to FIG. 13, the same parts as those in the first embodiment shown in FIG. 1 to FIG. 4A and FIG. To do.

Display Front Plate The display front plate 40 according to the present embodiment is the same as the display front plate 40 manufactured at one manufacturer or the manufacturing site. It is configured assuming that it is combined with a protective layer or the like.

As shown in FIG. 11, the display front plate 40 includes a transparent substrate 20, a buffer layer 60 provided on the observer side of the transparent substrate 20, and an observer side of the buffer layer 60. And an adhesive layer (observer side adhesive layer) 100 provided on the observer side of the antireflection film 30. Among these, the antireflection film 30 has a low refractive index layer 31 located on the outermost surface on the viewer side. Note that the phrase “low refractive index layer 31 positioned on the outermost surface on the viewer side” means that when the antireflection film 30 is composed of a plurality of layers, the layer positioned on the outermost surface on the viewer side among these layers. Means that the low refractive index layer 31 is formed. That is, the phrase “low refractive index layer 31 positioned on the outermost surface on the viewer side” is a form in which other layers such as the adhesive layer 100 are further provided on the viewer side of the antireflection film 30 on the display front plate 40. Is not excluded.

(Adhesive layer)
The adhesive layer 100 provided on the observer side of the transparent substrate 20 is a layer provided for bringing the display front plate 40 into close contact with a member such as a protective layer that can be disposed on the viewer side of the display front plate 40. When the display front plate 40 includes the adhesive layer 100 in advance, the operation of combining the display front plate 40 and the protective layer can be facilitated.

The material constituting the adhesive layer 100 is appropriately selected according to the member combined with the display front plate 40 and the usage environment of the display front plate 40. For example, a pressure-sensitive adhesive (silicone pressure-sensitive adhesive) made of a polyorganosiloxane composition having a desired plasticity (for example, a polyorganosiloxane composition described in JP-A-2004-212521), or an acrylic pressure-sensitive adhesive (for example, special A transparent pressure-sensitive adhesive sheet made of an acrylic pressure-sensitive adhesive described in Japanese Unexamined Patent Publication No. 2002-348546 is used as the adhesive layer 100. Such a transparent pressure-sensitive adhesive sheet is, for example, a sheet obtained by crosslinking an acrylic ester copolymer with an epoxy-based, isocyanate-based, melamine-based or metal compound-based crosslinking agent, or an ultraviolet curable acrylic pressure-sensitive adhesive. It is obtained by processing.

The thickness of the adhesive layer 100 is appropriately selected according to the material used, the member combined with the display front plate 40, the usage environment of the display front plate 40, and the like, but is within the range of 1 to 200 μm, for example. .

Although not shown, the adhesive layer 100 of the display front plate 40 may be covered with a film made of PET or the like. As a result, the adhesive force of the adhesive layer 100 can be prevented from deteriorating, and the handling of the display front plate 40 can be improved.

(Modification)
As shown in FIG. 12, a protective layer 105 may be provided in advance on the viewer side of the adhesive layer 100 provided on the viewer side of the antireflection film 30. This protective layer 105 is a layer provided with the intention of preventing fragments of the transparent substrate 20 from scattering even if the transparent substrate 20 of the display front plate 40 is damaged. . Examples of the material of the protective layer 105 include a photo-curing resin type, a thermosetting resin type, a two-component mixed reaction liquid type, and a double-sided adhesive seal type material. Among these, in the photo-curing resin type, a radical curing material or a cationic curing material is used. The radical curable materials include acrylic, ene / thiol, and vinyl ether materials, and the cationic curable materials include epoxy, oxetane, and vinyl ether materials. Thermosetting resin type materials include epoxy-based, phenol-based, and polyester-based materials.

(Other variations)
11 and FIG. 12, the example in which the adhesive layer 100 is located on the viewer side of the display front plate 40 has been shown. However, the present invention is not limited to this, and the adhesive layer 100 may be positioned on the display unit side of the display front plate 40. For example, as shown in FIG. 13, the display front plate 40 may have an adhesive layer (display unit side adhesive layer) 100 located on the outermost surface on the display unit side. Thereby, the operation | work which combines the member which can be provided in the display part side of the display front board 40, for example, a display part, the touchscreen sensor mentioned later, and the display front board 40 can be facilitated.

11 to 13 show an example in which the antireflection film 30 is composed only of the low refractive index layer 31. However, the present invention is not limited to this, and the antireflection film 30 may further include a high refractive index layer 32 as in the case of the third embodiment described above. Further, as in the case of the fourth embodiment described above, the display front plate 40 may further include an additional buffer layer 65 and an additional antireflection film 35. In this case, the adhesive layer 100 may be provided on the display unit side of the additional antireflection film 35.

Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIG. 14 and FIG. 15 differs only in that the additional low refractive index layer of the additional antireflection film is increased in hardness, and the other configuration is the fourth configuration shown in FIG. This is substantially the same as the embodiment. In the sixth embodiment shown in FIG. 14 and FIG. 15, the same parts as those in the fourth embodiment shown in FIG.

Display Front Plate As shown in FIG. 14, the display front plate 40 includes a buffer layer 60 provided on the observer side of the transparent substrate 20, and an antireflection film 30 provided on the observer side of the buffer layer 60. The additional buffer layer 65 provided on the display unit 50 side of the transparent substrate 20 and the additional antireflection film 35 provided on the display unit 50 side of the additional buffer layer 65 are provided. Among these, the antireflection film 30 has a low refractive index layer 31 positioned on the outermost surface of the antireflection film 30 on the viewer side, and the additional antireflection film 35 is on the display unit side of the additional antireflection film 35. And an additional low refractive index layer 36A located on the outermost surface of the. The present embodiment is characterized in that the scratch resistance of the additional low refractive index layer 36A of the additional antireflection film 35 is higher than the scratch resistance of the low refractive index layer 31 of the antireflection film 30. In this way, by providing a difference between the scratch resistance of the low refractive index layer 31 and the scratch resistance of the additional low refractive index layer 36A, as described later, the manufacturing process of the display front plate 40 and the display front plate 40 are displayed. It is possible to prevent the low refractive index layer 31 and the additional low refractive index layer 36A from being damaged in the process of combining with other members.

Generally, when layers are formed on both sides of the transparent substrate 20, the transparent substrate 20 is prepared first, and then the first layer is formed on the upper side (one side) of the transparent substrate 20. Thereafter, the transparent substrate 20 on which the first layer is formed is turned upside down, and then the second layer is formed on the upper side (the other side) of the transparent substrate 20. Therefore, when the second layer is formed, the first layer is located below the transparent substrate 20. For this reason, while the second layer is formed, the first layer comes into contact with a manufacturing facility such as a transport table, and the first layer may be damaged during this period.

On the other hand, according to the present embodiment, when the antireflection film 30, the additional antireflection film 35, the buffer layer 60, and the additional buffer layer 65 are formed on the transparent substrate 20, first, on the upper side (display unit side) of the transparent substrate 20. The additional buffer layer 65 and the additional antireflection film 35 are formed, then the transparent substrate 20 is turned upside down, and then the antireflection film 30 and the buffer layer 60 are formed on the upper side (observer side) of the transparent substrate 20. Here, as described above, the scratch resistance of the additional low refractive index layer 36 A of the additional antireflection film 35 is higher than the scratch resistance of the low refractive index layer 31 of the antireflection film 30. Therefore, even if the additional low refractive index layer 36A of the additional antireflective film 35 is in contact with manufacturing equipment such as a transport table while the antireflection film 30 and the buffer layer 60 are formed, the additional low refractive index layer 36 is damaged. Can be prevented.

(Additional low refractive index layer)
Next, a specific method for forming such an additional low refractive index layer 36A will be described. As described above, generally, there is a trade-off relationship between reducing the optical refractive index of the material constituting the layer and increasing the scratch resistance of the material constituting the layer. Therefore, in general, by making the optical refractive index of the additional low refractive index layer 36A higher than the optical refractive index of the low refractive index layer 31, the scratch resistance of the additional low refractive index layer 36A can be improved. It becomes possible to make it higher. For example, when the optical refractive index of the low refractive index layer 31 is sufficiently smaller than the optical refractive index of the transparent substrate 20, for example, 1.35, the optical refractive index of the additional low refractive index layer 36A is low refractive index. It is set to a value larger than the light refractive index of the refractive index layer 31 and smaller than the light refractive index of the transparent substrate 20, for example, 1.45. Thereby, it is possible to impart higher scratch resistance to the additional low refractive index layer 36 A than the low refractive index layer 31. Such an additional low refractive index layer 36A is preferably a case where steel wool (No. 0000) loaded with 600 g is swept over the additional low refractive index layer 36A (10 reciprocations, 100 mm stroke). In addition, the additional low refractive index layer 36A after sweeping has scratch resistance such that scratch marks are not visually recognized.

Further, it is generally known that there is a correspondence relationship between the light refractive index and the reflectance that the reflectance decreases as the light refractive index decreases. Therefore, the additional low refractive index layer 36A is configured such that the reflectance of the additional low refractive index layer 36A is higher than the reflectance of the low refractive index layer 31, thereby reducing the scratch resistance of the additional low refractive index layer 36A. It can also be made higher than the scratch resistance of the rate layer 31. For example, the low refractive index layer 31 and the additional low refractive index layer 36A are set so that the reflectance of the low refractive index layer 31 is 1% or less and the reflectance of the additional low refractive index layer 36A is in the range of 1 to 2%. May be configured.

(Modification)
When the additional antireflection film 35 having the additional low refractive index layer 36A with enhanced scratch resistance is used as described above, the scratch resistance of the display front plate 40 on the display unit side is determined by the additional low refractive index layer 36A. Sufficiently secured. Therefore, when the additional antireflection film 35 having the additional low refractive index layer 36A is used, the additional buffer layer 65 is not provided between the transparent substrate 20 and the additional antireflection film 35 as shown in FIG. Also good. Thereby, the formation process of the additional buffer layer 65 in the manufacturing process of the display front plate 40 can be reduced. Thus, the productivity of the display front plate 40 can be improved while ensuring the scratch resistance of the display front plate 40 on the display unit side.

In the present embodiment and its modifications, the additional antireflection film 35 is composed of only the additional low refractive index layer 36A. However, the present invention is not limited to this, and the additional antireflection film 35 may further include an additional high refractive index layer 37 as in the case of the modification of the fourth embodiment described above. Similarly, the antireflection film 30 may further include a high refractive index layer 32. Thereby, the effect of preventing reflection of external light by the antireflection film 30 and the additional antireflection film 35 can be further enhanced.
Further, as in the case of the fifth embodiment described above, the adhesive layer 100 may be provided on the viewer side of the antireflection film 30 or the display unit side of the additional antireflection film 35. Thereby, the operation | work which combines the front plate 40 for a display and another member can be facilitated. Similarly to the modification of the fifth embodiment described above, the protective layer 105 may be provided on the observer side of the adhesive layer 100 provided on the observer side of the antireflection film 30.

Seventh Embodiment Next, a seventh embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIGS. 16 to 20 is different only in that the display unit of the display device has a touch panel sensor, and other configurations are the first shown in FIGS. 1 to 4A and 4B. This is substantially the same as the embodiment. In the seventh embodiment shown in FIG. 16 to FIG. 20, the same parts as those in the first embodiment shown in FIG. 1 to FIG. 4A and FIG. To do.

Display Device As shown in FIG. 16, the display device 70 includes a display unit 50 and a display front plate 40 arranged on the viewer side with respect to the display unit 50. As the display front plate 40, any one of the display front plates 40 shown in the first to sixth embodiments described above is appropriately used. As shown in FIG. 16, the display unit 50 is provided on the viewer side of the display unit 151 that emits light for displaying an image to the viewer side, and the display device 70 is on the viewer side. A touch panel sensor 110 that detects a touch location when touched. As the display unit 151, various types such as an LCD, a PDP, an organic EL, an inorganic EL, or a field emission type can be used as in the above-described embodiments.

In addition, when it is desired that the display front plate 40 and the display unit 50 be firmly attached, the display front plate 40 having the adhesive layer 100 positioned on the outermost surface on the display unit side is preferably used. Accordingly, the display front plate 40 and the display unit 50 are firmly adhered to each other, thereby preventing an air gap from being generated between the display front plate 40 and the display unit 50.

Alternatively, as illustrated in FIG. 17, the display unit 50 may further include an adhesive layer 101 provided on the viewer side of the touch panel sensor 110. Since the display unit 50 has the adhesive layer 101 in advance, the display unit 50 and the display front plate 40 can be firmly adhered to each other, and the display unit 50 and the display front plate 40 are combined. Can be facilitated.

Touch Panel Sensor Next, the touch panel sensor 110 of the display unit 50 will be described in detail. The type of touch panel sensor 110 included in display unit 50 is not particularly limited, and various types of touch panel sensor 110 can be used as appropriate. For example, a resistive touch panel sensor that detects a touch location based on a pressure from a detected object or a capacitive touch panel sensor that detects a touch location based on static electricity from a detected body such as a human body is used. Can be.

In addition, various types of touch panel sensors such as an optical sensor method, a matrix switch method, a surface acoustic wave method, and an electromagnetic induction method can be used. Among these, the optical sensor type touch panel sensor is provided with an optical sensor that receives light and performs photoelectric conversion, and is provided on the viewer side so as to face the optical sensor, and selectively transmits light in a specific wavelength range. And a permselective layer. In this case, the optical sensor mainly receives light in a specific wavelength range that has passed through the selective transmission layer. And it detects that the to-be-detected body touched the display apparatus 70 from the observer side, when an optical sensor detects the reflected light from to-be-detected bodies, such as a finger. In such an optical sensor type touch panel sensor, the touch location is detected based on the reflected light from the detected object, so the detected object is not limited to a human body such as a finger, and various objects can be detected. It is possible to detect the touch location. Further details of such an optical sensor type touch panel sensor are described in, for example, Japanese Unexamined Patent Application Publication Nos. 2009-151039 and 2007-192713.

(Capacitive touch panel sensor)
Next, an example of the configuration of the touch panel sensor 110 in the case where the touch panel sensor 110 is a capacitive type will be described with reference to FIGS. 18A to 18C. 18A is a plan view showing the capacitive touch panel sensor 110, FIG. 18B is a cross-sectional view of the touch panel sensor 110 of FIG. 18A viewed from the XVIIIB-XVIIIB direction, and FIG. 18C is a touch panel of FIG. 18A. It is sectional drawing which looked at the sensor 110 from the XVIIIC-XVIIIC direction.

As shown in FIGS. 18A to 18C, the capacitive touch panel sensor 110 includes a touch panel sensor substrate 116 and a plurality of x provided in a predetermined pattern on the viewer side surface of the touch panel sensor substrate 116. The transparent conductive pattern 111 and the y transparent conductive pattern 112 are provided. As shown in FIG. 18A, the x transparent conductive pattern 111 extends in the x direction, and the y transparent conductive pattern 112 extends in the y direction orthogonal to the x direction.

Each x transparent conductive pattern 111 has a plurality of x electrode units 111a having a substantially square shape, and an x connection portion 111b that connects adjacent x electrode units 111a in the x direction. By such an x transparent conductive pattern 111, the position in the y direction of the touch location of the detection object is detected. Each of the y transparent conductive patterns 112 includes a plurality of y electrode units 112a having a substantially square shape, and a y connection portion 112b that connects adjacent y electrode units 112a in the y direction. Such a y transparent conductive pattern 112 detects the position in the x direction of the touch location of the detection object.

Further, on the touch panel sensor substrate 116, the extraction wiring 113 and the extraction wiring 114, which are provided in a predetermined pattern and are electrically connected to the x transparent conductive pattern 111 and the y transparent conductive pattern 112, respectively, and the extraction wiring 113 and the extraction wiring. Terminal portions 115 connected to the wiring 114 and for taking out signals from the x transparent conductive pattern 111 and the y transparent conductive pattern 112 to the outside are provided.

In the touch panel sensor 110, a sensor unit 120 that realizes a touch panel function of detecting a touch position and extracting a detection signal to the outside by a combination of the

conductive patterns

111 and 112, the

extraction wirings

113 and 114, and the terminal unit 115 described above. Is configured.

Next, the material of each component of the touch panel sensor 110 will be described. Each of the x transparent conductive pattern 111 and the y transparent conductive pattern 112 is disposed in a display area for displaying an image. Therefore, each of the x transparent conductive pattern 111 and the y transparent conductive pattern 112 is made of a material having conductivity and transparency, such as ITO. On the other hand, the extraction wiring 113, the extraction wiring 114, and the terminal portion 115 are arranged in a non-display area located at the periphery of the display area. For this reason, the material which comprises the extraction wiring 113, the extraction wiring 114, and the terminal part 115 does not need to have transparency. Therefore, the lead-out wiring 113, the lead-out wiring 114, and the terminal portion 115 are generally made of a metal material having a higher electrical conductivity than the materials of the x transparent conductive pattern 111 and the y transparent conductive pattern 112.

The material of the touch panel sensor substrate 116 is not particularly limited as long as it supports the

conductive patterns

111 and 112, the

extraction wirings

113 and 114, and the terminal portion 115 and has transparency. For example, glass or polymer having transparency is used as the material for the touch panel sensor substrate 116.

As shown in FIGS. 18B and 18C, the sensor unit 120 including the

conductive patterns

111 and 112, the

extraction wirings

113 and 114, and the terminal unit 115 is obtained by laminating ITO or a metal material on the touch panel sensor substrate 116. It is formed. As shown in FIGS. 18B and 18C, an insulating layer 117 is provided between the x connection part 111b and the y connection part 112b in order to prevent the x connection part 111b and the y connection part 112b from being electrically connected. It may be interposed. 18B and 18C, a protective layer 119 for protecting the

conductive patterns

111 and 112, the

extraction wirings

113 and 114, and the terminal portion 115 may be provided. As the protective layer 119, a resin material having transparency and insulation is used as appropriate.

According to the present embodiment, the display unit 50 of the display device 70 has the touch panel sensor 110. For this reason, a touch panel function can be given to the display device 70. Further, the display front plate 40 according to the first to sixth embodiments described above is provided on the viewer side of the touch panel sensor 110 of the display unit 50. For this reason, the touch panel sensor 110 can be appropriately protected by the display front plate 40, and the reflection of external light on the viewer side of the display device 70 can be prevented.

In the above-described example, the example in which the sensor unit 120 is provided on the surface on the viewer side of the touch panel sensor substrate 116 is shown. However, the present invention is not limited to this, and the sensor unit 120 may be provided on the display unit side surface of the touch panel sensor substrate 116.
In addition, a part of each component of the sensor unit 120 is provided on the surface of the touch panel sensor substrate 116 on the viewer side, and the other part of each component of the sensor unit 120 is on the display unit side of the touch panel sensor substrate 116. It may be provided on the surface. For example, the x transparent conductive pattern 111 may be provided on the surface of the touch panel sensor substrate 116 on the viewer side, and the y transparent conductive pattern 112 may be provided on the surface of the touch panel sensor substrate 116 on the display unit side.

(Modification)
As illustrated in FIG. 19, the touch panel sensor 110 may further include a signal processing unit 125 for processing a signal detected by the sensor unit 120 in addition to the touch panel sensor substrate 116 and the sensor unit 120. . The signal processing unit 125 includes, for example, a printed circuit board and a processing IC that is provided on the printed circuit board and analyzes a touch location based on a signal from the sensor unit 120. In addition, a wiring may be included in the signal processing unit 125 to extract an electrical signal to the outside. Such wiring may be composed of, for example, a flexible substrate.
The signal processing unit 125 is connected to the terminal unit 115 of the sensor unit 120, for example, as indicated by a one-dot chain line in FIG. 18A.

As shown in FIG. 20, the touch panel sensor 110 may further include a signal processing unit 125, and an adhesive layer 101 may be provided between the touch panel sensor 110 and the display front plate 40.

Eighth Embodiment Next, an eighth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a specific configuration example in the case where the display unit of the display device in each of the above embodiments is an LCD type will be described. In the eighth embodiment shown in FIGS. 21 to 34, the same parts as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 21 is a diagram illustrating an example of the display device 70 including the LCD type display unit 50. As shown in FIG. 21, the display unit 50 includes an LCD type display unit 151 and a touch panel sensor 110 provided on the viewer side of the display unit 151.

(Display unit)
The display unit 151 includes a backlight unit 158, a light source side polarizing plate 156 provided on the viewer side of the backlight unit 158, an LCD panel 155 provided on the viewer side of the light source side polarizing plate 156, and an LCD panel And 155 an observer side polarizing plate 154 provided on the observer side. As the backlight unit 158, various types of light sources such as fluorescent tubes and LEDs can be used. In addition, a reflection plate that reflects light from the fluorescent tube or the LED may be further included outside the fluorescent tube or the LED (on the side opposite to the observer side). As the observer-side polarizing plate 154 and the light source-side polarizing plate 156, well-known polarizing plates can be appropriately used in the LCD type display unit. Although not shown, an adhesive layer may be interposed between the constituent elements of the display device 70.

(LCD panel)
As shown in FIG. 22, the LCD panel 155 includes a TFT substrate 210, a color filter 200 provided on the viewer side of the TFT substrate 210, and a liquid crystal layer 215 filled between the TFT substrate 210 and the color filter 200. And. Although not shown, each of the TFT substrates 210 corresponds to a unit pixel of the display device 70, and includes a plurality of liquid crystal driving units that apply a predetermined voltage to the liquid crystal 215 to control the state of the liquid crystal layer 215. The color filter 200 includes a color filter substrate 201, a black matrix layer 202 provided in a predetermined pattern on the color filter substrate 201, and a plurality of colored layers 203 provided between the black matrix layers 202. Contains.

The material of the color filter substrate 201 is not particularly limited as long as it appropriately supports the black matrix layer 202 and the colored layer 203 and has transparency. For example, as a material for the color filter substrate 201, transparent glass, polymer, or the like is used.

According to the present embodiment, the LCD type display device 70 includes the display unit 50 and the display front plate 40 provided on the viewer side of the display unit 50. For this reason, it is possible to prevent external light from being reflected on the viewer side of the LCD type display device 70.

Further, according to the present embodiment, the display unit 50 includes the touch panel sensor 110. Therefore, a touch panel function can be given to the LCD type display device 70.

(Modification)
In the present embodiment, as shown in FIG. 23, the display unit 151 may further include an optical compensation film 157 provided between the light source side polarizing plate 156 and the backlight unit 158. The optical compensation film 157 is made of, for example, a retardation film, a brightness enhancement film, a light guide plate, or the like. By further providing such an optical compensation film 157, the quality of light incident on the light source side polarizing plate 156 from the backlight unit 158 can be further increased. The optical compensation film 157 may be a component separate from the backlight unit 158 or may be a component included in the backlight unit 158.

(Intermediate product)
In the above-described embodiment and its modifications, an example in which the display unit 151 including the backlight unit 158 is combined with the touch panel sensor 110 and the display front plate 40 has been described. However, the present invention is not limited to this, and before the display unit 151 is formed, each component of the display unit 151, such as the observer-side polarizing plate 154 and the LCD panel 155, is the touch panel sensor 110 and the display unit. It may be combined with the front plate 40.

For example, as shown in FIG. 24, the observer-side polarizing plate 154 and the LCD panel 155 may be combined with the touch panel sensor 110 and the display front plate 40, thereby forming an intermediate product 220 for the display device.
Further, as shown in FIG. 25, an observer-side polarizing plate 154, an LCD panel 155, and a light source-side polarizing plate 156 are combined with the touch panel sensor 110 and the display front plate 40, whereby an intermediate product 220 for a display device is formed. It may be configured.
As shown in FIG. 26, an observer-side polarizing plate 154, an LCD panel 155, a light source-side polarizing plate 156, and an optical compensation film 157 are combined with the touch panel sensor 110 and the display front plate 40, thereby providing a display device. Intermediate product 220 may be configured.

(Modification of touch panel sensor arrangement)
In the above-described embodiment and its modifications, the touch panel sensor 110 is a separate component from the display unit 151, and the touch panel sensor 110 is provided on the viewer side of the LCD panel 155 of the display unit 151. An example is given. However, the present invention is not limited to this, and the touch panel sensor 110 may be included in the display unit 151, and the touch panel sensor 110 may be provided between the observer-side polarizing plate 154 and the LCD panel 155.

FIGS. 27 to 31 are diagrams showing an example of a form in which the touch panel sensor 110 is provided between the observer-side polarizing plate 154 and the LCD panel 155. FIG. The configurations shown in FIGS. 27 to 31 are different from each other only in that the touch panel sensor 110 is provided between the observer-side polarizing plate 154 and the LCD panel 155. Other configurations are the same as those in FIGS. Thru | or substantially the same as the form shown in FIG.

Note that “the touch panel sensor 110 is a separate component from the display unit 151” means that the touch panel sensor 110 is transacted and transported separately from the display unit 151. Further, “the touch panel sensor 110 is included in the display unit 151” means that the touch panel sensor 110 is transacted or transported at the same time as the display unit 151.

(Example of touch panel sensor integrated color filter)
Further, in the above-described embodiment and its modification examples, the touch panel sensor 110 is an example in which the touch panel sensor 110 is a separate component from the color filter 200 of the LCD panel 155. However, the present invention is not limited to this, and the touch panel sensor may be formed integrally with the color filter 200. Note that “the touch panel sensor is integrally formed with the color filter” means that the touch panel sensor substrate and the color filter substrate are common, as will be described below with reference to FIG. I mean.

FIG. 32 is a view showing a color filter 200A integrated with a touch panel sensor having a touch panel function. As shown in FIG. 32, the color filter 200A includes a color filter substrate 201, a sensor unit 120 provided on the observation side of the color filter substrate 201, and a black provided on the display unit side of the color filter substrate 201. A matrix layer 202 and a colored layer 203. Here, the sensor unit 120 is substantially the same as the sensor unit 120 in the seventh embodiment shown in FIGS.

In this modification, the LCD panel 155A has the touch panel sensor integrated color filter 200A, so that the LCD panel 155A has a touch panel function. FIG. 33 is a diagram showing a display device 70 including an LCD panel 155A having a touch panel function.

According to this modification, as described above, the touch panel sensor is formed integrally with the color filter. Thereby, the touch panel function can be easily provided by the display device 70. Further, a substrate for the touch panel sensor can be made unnecessary as compared with the case where the color filter 200 and the touch panel sensor 110 are configured separately. Therefore, when the display device 70 with a touch panel function is configured using the touch panel sensor integrated color filter 200A, the thickness and weight of the display device 70 can be reduced by the amount of the substrate for the touch panel sensor.
In addition, when the color filter 200 and the touch panel sensor 110 are comprised separately, it is possible that the color filter 200 and the touch panel sensor 110 are bonded together by an adhesive layer. For this reason, it can be considered that the light transmittance in the touch panel sensor 110 is reduced by the amount of the adhesive layer. On the other hand, according to this modification, the touch panel sensor and the color filter are integrally formed, thereby eliminating the need for an adhesive layer for bonding. Thereby, the light transmittance can be improved. Moreover, the process of bonding the color filter 200 and the touch panel sensor 110 using an adhesive layer is not necessary. As a result, the number of manufacturing steps can be reduced, and problems that may occur during bonding can be avoided. For example, it is possible to eliminate the concern that bubbles or the like are mixed at the time of bonding, thereby reducing the yield.

In the present specification, “display device 70 / display unit 50 / display unit 151 includes / includes / includes touch panel sensor 110” means that display device 70 / display unit 50 / display unit 151 performs transactions independently. When the sensor unit 120 is included in predetermined components of the display device 70 / the display unit 50 / the display unit 151 such as a color filter, as well as the case where the touch panel sensor 110 that can be transported is included / included / included. It is also a concept that includes.

Ninth Embodiment Next, the ninth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a specific configuration example in the case where the display portion of the display device in the first to seventh embodiments is of an organic EL or inorganic EL type will be described. In the ninth embodiment shown in FIGS. 34 and 35, the same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 34 is a diagram illustrating an example of a display device 70 including an organic EL or inorganic EL type display unit 50. As shown in FIG. 34, the display unit 50 includes an organic EL or inorganic EL type display unit 151 and a touch panel sensor 110 provided on the viewer side of the display unit 151.

(Display unit)
The display unit 151 is provided on the viewer side of the reflective electrode layer 164 and the reflective electrode layer 164, a light emitting layer 163 made of an organic light emitting material or an inorganic light emitting material, and a color filter provided on the viewer side of the light emitting layer 163. 200 and an observer-side polarizing plate 154 provided on the observer side of the color filter 200. Although not shown, an adhesive layer may be interposed between the constituent elements of the display device 70.

According to the present embodiment, the organic EL or inorganic EL type display device 70 includes the display unit 50 and the display front plate 40 provided on the viewer side of the display unit 50. For this reason, it is possible to prevent external light from being reflected on the viewer side of the display device 70 of the organic EL or inorganic EL type.

Further, according to the present embodiment, the display unit 50 includes the touch panel sensor 110. For this reason, a touch panel function can be provided to the organic EL or inorganic EL type display device 70.

(Intermediate product)
In the above-described embodiment, the example in which the display unit 151 including the reflective electrode layer 164 is combined with the touch panel sensor 110 and the display front plate 40 has been described. However, the present invention is not limited to this, and before the display unit 151 is formed, each component of the display unit 151, such as the observer-side polarizing plate 154 and the color filter 200, is the touch panel sensor 110 and the display unit. It may be combined with the front plate 40.

For example, as shown in FIG. 35, the observer-side polarizing plate 154, the color filter 200, and the light emitting layer 163 are combined with the touch panel sensor 110 and the display front plate 40, thereby forming an intermediate product 220 for the display device. May be.

Also in the present embodiment, a touch panel sensor integrated color filter 200A having a touch panel function may be used as in the case of the embodiments shown in FIGS. Thereby, the touch panel function can be easily provided by the display device 70.

Also in this embodiment, the touch panel sensor 110 may be provided on the display unit side of the observer-side polarizing plate 154 as in the case of the embodiments shown in FIGS.

Tenth Embodiment Next, a tenth embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIGS. 36 to 40 is different only in that the display front plate has a touch panel sensor. Other configurations are the same as the first embodiment shown in FIGS. 1 to 4A and 4B. This is substantially the same as the embodiment. In the tenth embodiment shown in FIGS. 36 to 40, the same parts as those in the first embodiment shown in FIGS. 1 to 4A and 4B are denoted by the same reference numerals, and detailed description thereof is omitted. To do.

Display Front Plate As shown in FIG. 36, the display front plate 40A is provided on the transparent substrate 20, the buffer layer 60 provided on the observer side of the transparent substrate 20, and the observer side of the buffer layer 60. The anti-reflection film 30 and the touch panel sensor 110 provided on the display unit side of the transparent substrate 20 are included. As described above, in the present embodiment, the display front plate 40A includes the touch panel sensor 110, whereby the touch panel function is provided to the display front plate 40A.

FIG. 37 is a diagram showing a display device 70 that includes a display unit 50 and a display front plate 40 A that is provided on the viewer side of the display unit 50 and has a touch panel sensor 110. According to the present embodiment, by using the display front plate 40A with a touch panel function, the touch panel function can be given to the display device 70 more easily, and the outside light on the viewer side of the display device 70 can be provided. Can be prevented from occurring.

Incidentally, the touch panel sensor 110 is in direct contact with the transparent substrate 20 in the display front panel 40A shown in FIG. In this case, it is conceivable that an air gap is generated between the transparent substrate 20 and the touch panel sensor 110, and it is conceivable that light is reflected on the display unit side of the transparent substrate 20 due to the air gap. Hereinafter, modified examples for preventing such reflection of light will be described.

(First modification)
FIG. 38 is a diagram illustrating an example in which the adhesive layer 100 is provided between the transparent substrate 20 and the touch panel sensor 110. By providing such an adhesive layer 100, it is possible to prevent an air gap from being generated between the transparent substrate 20 and the touch panel sensor 110, whereby light is reflected on the display unit side of the transparent substrate 20. Can be prevented.

(Second modification)
FIG. 39 is a diagram illustrating an example in which the additional buffer layer 65 and the additional antireflection film 35 are provided on the display unit side of the transparent substrate 20. In the form shown in FIG. 39, it is possible to prevent light from being reflected on the display unit side of the transparent substrate 20 by providing the additional antireflection film 35 formed of the additional low refractive index layer 36. Further, by providing the additional buffer layer 65, it is possible to prevent the additional antireflection film 35 from being damaged.

(Third Modification)
FIG. 40 is a diagram illustrating an example in which the additional antireflection film 35 including the additional low refractive index layer 36A is provided on the display unit side of the transparent substrate 20. The additional low refractive index layer 36A is an additional low refractive index layer with improved scratch resistance, as in the case of the sixth embodiment described above. By providing such an additional low refractive index layer 36A, it is possible to prevent light from being reflected on the display unit side of the transparent substrate 20, and to make the additional buffer layer 65 unnecessary.

(Other variations)
In the present embodiment and its modified examples, the form in which the antireflection film 30 or the additional antireflection film 35 includes only the low refractive index layer 31 or the additional low refractive index layers 36 and 36A is shown. However, the present invention is not limited to this, and the antireflection film 30 or the additional antireflection film 35 is the high refractive index layer 32 or the additional high refraction, as in the case of the modifications of the third and fourth embodiments. The rate layer 37 may be further included. Thereby, the effect of preventing reflection of external light by the antireflection film 30 and the additional antireflection film 35 can be further enhanced.
Further, as in the case of the fifth embodiment described above, the adhesive layer 100 may be provided on the viewer side of the antireflection film 30. As a result, the work of combining the display front plate 40A and other members can be facilitated. Similarly to the modification of the fifth embodiment described above, the protective layer 105 may be provided on the observer side of the adhesive layer 100 provided on the observer side of the antireflection film 30.

In the present embodiment and the modification, the display front plate 40A may further include an observer-side polarizing plate 154, a color filter 200, and the like. For example, as shown in FIG. 41, an observer-side polarizing plate 154 may be provided between the transparent substrate 20 and the touch panel sensor 110. Further, as shown in FIG. A filter 200 may be provided. Although not shown, the arrangement of the touch panel sensor 110 and the arrangement of the observer side polarizing plate 154 shown in FIGS. 41 and 42 may be interchanged.

Eleventh Embodiment Next, an eleventh embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIGS. 43 to 48 is only different in that the touch panel sensor is integrally formed with the display front plate, and the other configuration is the tenth embodiment shown in FIGS. 36 to 42. The form is substantially the same. In the eleventh embodiment shown in FIG. 43 to FIG. 48, the same parts as those in the tenth embodiment shown in FIG. 36 to FIG.

FIG. 43 is a diagram showing a display front plate 40A formed integrally with the touch panel sensor. As shown in FIG. 43, the display front plate 40 A includes a transparent substrate 20, a buffer layer 60 provided on the observer side of the transparent substrate 20, and an antireflection film 30 provided on the observer side of the buffer layer 60. And a sensor unit 120 provided on the surface of the transparent substrate 20 on the display unit side. Here, since the sensor part 120 is substantially the same as the sensor part 120 shown in the above-mentioned 7th Embodiment, detailed description is abbreviate | omitted.

Here, "the touch panel sensor is formed integrally with the display front plate 40A" means that the touch panel sensor substrate and the display front plate transparent substrate are common as shown in FIG. It means that

Thus, according to the present embodiment, the touch panel sensor is integrated with the display front plate 40A. Thereby, a touch panel function can be given to the display front plate 40A more easily. Further, the touch panel sensor substrate and the display front plate 40 can be made unnecessary as compared with the case where the touch panel sensor 110 and the display front plate 40 are configured separately. Therefore, when the display device 70 with a touch panel function is configured using the display front plate 40A, the thickness and weight of the display device 70 can be reduced by the amount of the substrate for the touch panel sensor.

Further, according to the present embodiment, the surface of the transparent substrate 20 on the display unit side is covered with the sensor unit 120. Therefore, no air gap is formed on the surface of the transparent substrate 20 on the display unit side. Therefore, it is possible to prevent light from being reflected on the display unit side of the transparent substrate 20 without providing the adhesive layer 100 or the like on the display unit side of the transparent substrate 20 as in the case of the tenth embodiment described above. Can do. That is, according to the present embodiment, not only a touch panel function can be given to the display front plate 40A, but also light reflection on the display unit side of the transparent substrate 20 can be prevented.
Further, by preventing the adhesive layer 100 from being interposed between the sensor unit 120 and the transparent substrate 20, the sensitivity of the sensor unit 120 can be improved and the light transmittance can be improved. Moreover, the process of bonding the transparent substrate 20 and the touch panel sensor 110 via the adhesive layer 100 becomes unnecessary, thereby reducing the number of manufacturing steps and avoiding problems that may occur at the time of bonding. For example, it is possible to eliminate the concern that bubbles or the like are mixed at the time of bonding, thereby reducing the yield.

In this specification, “the display front plate 40A includes / includes / includes the touch panel sensor 110” means that the display front plate 40A includes the touch panel sensor 110 that can be independently traded, transported, etc. The concept includes not only the case where the sensor unit 120 is included but also the case where the sensor unit 120 is formed on the transparent substrate 20 of the display front plate 40A.

(Modification)
The form of the display front plate 40A formed integrally with the touch panel sensor is not limited to the form shown in FIG. 43, and various other forms can be considered. For example, as shown in FIG. 44, the adhesive layer 100 may be provided on the display unit side of the sensor unit 120. Further, as shown in FIGS. 45 and 46, a signal processing unit 125 may be attached to the sensor unit 120. 47, an observer-side polarizing plate 154 may be provided on the display unit side of the sensor unit 120. As shown in FIG. 48, a color filter 200 may be further provided on the display unit side of the observer side polarizing plate 154. Moreover, although the sensor part 120 showed the example formed on the surface by the side of the display part of the transparent substrate 20, it is not restricted to this, The sensor part 120 is formed on the surface by the side of the observer of the transparent substrate 20 May be.

(Other variations)
In the present embodiment and its modifications, the antireflection film 30 is composed of only the low refractive index layer 31. However, the present invention is not limited to this, and the antireflection film 30 may further include a high refractive index layer 32 as in the case of the modification of the third embodiment described above. Thereby, the effect of the antireflection film 30 preventing reflection of external light can be further enhanced. As in the case of the fourth embodiment described above, the display front plate 40A may further include an additional buffer layer 65 and an additional antireflection film 35. As in the case of the sixth embodiment, when the additional low refractive index layer 36A with improved scratch resistance is included in the additional antireflection film 35, the additional buffer layer 65 is not provided. Also good.
Further, as in the case of the fifth embodiment described above, the adhesive layer 100 may be provided on the viewer side of the antireflection film 30. As a result, the work of combining the display front plate 40A and other members can be facilitated. Similarly to the modification of the fifth embodiment described above, the protective layer 105 may be provided on the observer side of the adhesive layer 100 provided on the observer side of the antireflection film 30.

Further, in the modification of the present embodiment, an example in which the display front plate 40A with a touch panel function further includes the observer-side polarizing plate 154 and the color filter 200 is shown. However, the present invention is not limited to this, and the display front plate 40 that does not have a touch panel function may further include the observer-side polarizing plate 154 and the color filter 200.

Further, in the present embodiment and its modifications, an example in which the buffer layer 60 is provided on the observer side of the transparent substrate 20 and the sensor unit 120 is provided on the display unit side of the transparent substrate 20 is shown. However, the present invention is not limited to this, and as shown in FIG. 51A, both the buffer layer 60 and the sensor unit 120 may be provided on one side of the transparent substrate 20. For example, both the buffer layer 60 and the sensor unit 120 may be provided on the observer side of the transparent substrate 20, or both the buffer layer 60 and the sensor unit 120 are provided on the display unit 50 side of the transparent substrate 20. It may be.

One example of the buffer layer 60 and the sensor unit 120 of the display front plate 40 shown in FIG. 51A will be described with reference to FIG. 51B. 51B, on one side of the transparent substrate 20, a sensor unit 120 including an x transparent conductive pattern 111 formed on the surface of one side of the transparent substrate 20, and a sensor unit 120 is disposed. The buffer layer 60 is provided. Here, as shown in FIG. 51B, the buffer layer 60 is in partial contact with the surface on one side of the transparent substrate 20. That is, also in this modification, the buffer layer 60 is provided directly on the surface of the transparent substrate 20.

Also in the fifth to eleventh embodiments, even if the design layer 10 is formed in the non-display area on the viewer side of the

display front plates

40 and 40A as in the embodiment shown in FIG. Good.
In addition, the design layer 10 formed in the non-display area on the viewer side of the

display front plates

40 and 40A according to the above embodiments may have a function as various sensors. For example, the design layer 10 may have a function as an optical sensor. When the design layer 10 has a function as an optical sensor, the design layer 10 can be used as a touch panel sensor, a proximity sensor, or the like.
The proximity sensor is a sensor that can sense that an object is approaching without contacting the object. When such a proximity sensor is used as a switch, an on / off switching function as a switch can be exhibited without a third person recognizing that there is a switch. For example, in a mobile phone with a touch panel sensor or the like, when a person tries to make a call and an ear is brought close to the mobile phone or the like, the proximity sensor detects that the ear has approached the mobile phone or the like. Accordingly, the touch panel display can be automatically switched on and off, and power consumption can be saved by such a mechanism. In addition, even if the face is in contact with the touch panel sensor when the ear is approaching, it is possible to determine that the contact is not intended for operation using the touch panel sensor, thereby preventing malfunction. be able to.
The proximity sensor can check not only whether there is an object nearby but also the distance to the object. For this reason, for example, when a proximity sensor is used in a digital signage display, the power can be turned on only when a person approaches a predetermined distance. Furthermore, by combining with software that determines age, sex, etc., it is possible to provide optimal information.

(Modified example of transparent substrate)
Moreover, in each said embodiment, the example in which glass is used as the transparent substrate 20 was shown. However, the present invention is not limited to this, and the transparent substrate 20 may be a plastic substrate such as polycarbonate, polystyrene, or acrylic.
When glass is used as the transparent substrate 20, various types of glass can be used. For example, alkali glass such as soda glass or borosilicate glass may be used, or non-alkali glass may be used. Moreover, the chemically strengthened glass with which the chemically strengthened layer was provided in the surface of glass may be used. Here, the chemical strengthening layer is a layer formed by replacing sodium in the glass with potassium. By forming such a chemically strengthened layer on the glass surface, it is possible to prevent the transparent substrate 20 from cracking when some impact is applied to the transparent substrate 20. Note that the thickness of such a chemically strengthened layer is not particularly limited, and the thickness of the chemically strengthened layer is appropriately set according to required characteristics. For example, when it is necessary to ensure the cutting ability and productivity of the glass while imparting a certain degree of strength to the glass, the thickness of the chemical strengthening layer is set within a range of about 5 to 10 μm. Further, when it is required to impart higher strength to the glass, the thickness of the chemically strengthened layer may be set within a range of about 10 to 35 μm, or may be set to 35 μm or more. When the thickness of the chemically strengthened layer is in the range of about 10 to 35 μm, the glass has a certain degree of cutability. On the other hand, when the thickness of the chemically strengthened layer is 35 μm or more, it is difficult to cut the glass even if a high-performance cutting means such as a diamond cutter is used. Therefore, when the thickness of the chemically strengthened layer is required to be 35 μm or more, preferably, the chemically strengthened layer is formed on the surface of the glass by performing ion exchange treatment on the glass after being cut into a desired shape. The
Examples of the glass having a chemically strengthened layer formed on the surface in this way include Corning's Gorilla Glass (Gorilla Glass), Asahi Glass Company's Dragon Trail, and the like.

(Modification example of material of low refractive index layer)
In each of the above embodiments, the layer located on the outermost surface on the viewer side of the display front plate 40, for example, the low refractive index layer 31 or the protective layer 105 functions as an antifouling layer that prevents adhesion of dirt. May further be included. The function as an antifouling layer is, for example, fingerprint resistance, which is an oil and fat component that adheres when touched by human hands, water repellency against rainwater, slipperiness against dirt wiping, and magic. Magic resistance against graffiti. As a method for imparting a function as an antifouling layer to the low refractive index layer 31 or the protective layer 105, for example, the low refractive index layer 31 or the protective layer 105 contains silicon element, carbon element, and fluorine element at a predetermined ratio. Can be mentioned.

(A more preferable method for forming the buffer layer and the low refractive index layer)
In each of the above embodiments, an example in which the buffer layer 60 is formed by applying a coating solution containing the material of the buffer layer 60 on the transparent substrate 20 and a sheet-like or film-like buffer layer 60 are prepared. Then, an example in which this is formed on the transparent substrate 20 through an adhesive layer such as an adhesive or a tape is shown. Of these two types of methods, a method of forming the buffer layer 60 by applying a coating solution containing the material of the buffer layer 60 on the transparent substrate 20 is preferably used. The reason is as follows.
When the buffer layer 60 is bonded to the transparent substrate 20 via the adhesive layer, first, a sheet or film as a base material is prepared, and then a coating solution containing the material of the buffer layer 60 is applied onto the sheet or film. Thus, the sheet-like or film-like buffer layer 60 is produced. In this case, in the manufacturing process of the display front plate, an operation of attaching the sheet-like or film-like buffer layer 60 to the transparent substrate 20 occurs. In this case, it is conceivable that foreign matters, bubbles, or the like are mixed when the sheet-like or film-like buffer layer 60 is applied to the transparent substrate 20, thereby reducing the yield. Furthermore, the weight and thickness of the display front plate increase by the amount of the sheet or film that supports the buffer layer 60 and the adhesive layer for bonding the sheet-like or film-like buffer layer 60 and the transparent substrate 20 together. In addition, the light transmittance of the display front plate may be reduced. In addition, since the sheet-like or film-like buffer layer 60 generally has undulations, it may be possible that the appearance of the display front plate becomes non-uniform due to the undulations.
On the other hand, when forming the buffer layer 60 by apply | coating the coating liquid containing the material of the buffer layer 60 on the transparent substrate 20, the process of sticking the sheet-like or film-like buffer layer 60 on the transparent substrate 20 Can be reduced. As a result, the number of manufacturing steps can be reduced, and the above-described problems that may occur at the time of bonding can be avoided. In addition, by eliminating the sheet or film that supports the buffer layer 60 and the adhesive layer for bonding, the weight and thickness of the display front plate can be increased by the amount of the sheet or film and the adhesive layer. It is possible to prevent the light transmittance in the display front plate from being lowered by the amount of the sheet or film and the adhesive layer. That is, by providing the buffer layer 60 directly on the transparent substrate 20, the light transmittance of the display front plate can be increased as compared with the case where the sheet-like or film-like buffer layer 60 is used. Further, it is possible to prevent the appearance of the display front plate from becoming uneven due to the undulation of the sheet-like or film-like buffer layer 60.

In each of the above embodiments, the low refractive index layer 31 is formed by applying a coating solution containing the material of the low refractive index layer 31 onto the buffer layer 60, and the sheet-like or film-like low An example is shown in which the refractive index layer 31 is prepared and attached to the buffer layer 60 via an adhesive layer such as an adhesive or a tape. Of these two methods, the method of forming the low refractive index layer 31 by applying a coating solution containing the material of the low refractive index layer 31 onto the buffer layer 60 is preferable, as in the case of the buffer layer 60. Is used. Thus, as in the case of the buffer layer 60, the sheet or film-shaped low refractive index layer 31 produced by applying a coating liquid containing the material of the low refractive index layer 31 to the sheet or film serving as the base material. The process of sticking on the transparent substrate 20 can be reduced. As a result, the number of manufacturing steps can be reduced, and the above-described problems that may occur at the time of bonding can be avoided. Further, by eliminating the need for the sheet or film that supports the low refractive index layer 31 and the adhesive layer for bonding, the weight and thickness of the display front plate are increased by the amount of the sheet or film and the adhesive layer. Moreover, it can prevent that the transmittance | permeability of the light in a display front board falls only the part for a sheet | seat or a film, and an contact bonding layer. That is, by providing the low refractive index layer 31 directly on the buffer layer 60, the light transmittance of the display front plate is increased as compared with the case where the sheet or film low refractive index layer 31 is used. be able to. In addition, it is possible to prevent the appearance of the display front plate from becoming uneven due to the undulation of the sheet-like or film-like low refractive index layer 31.

In each of the above embodiments, the example in which the support member that supports the buffer layer 60 is configured by the transparent substrate 20 has been described. In particular, the example in which the buffer layer 60 is directly provided on the surface of the transparent substrate 20 has been described mainly. However, the present invention is not limited to this, and the support member that supports the buffer layer 60 may further include a member or layer other than the transparent substrate 20, and the buffer layer 60 may be provided on the member or layer. Good. For example, as illustrated in FIG. 52A, the support member 20 A including the transparent substrate 20 further includes an invisible layer 21 provided on the transparent substrate 20, and the buffer layer 60 and the sensor unit 120 are provided on the invisible layer 21. May be provided.

In general, the x transparent conductive pattern 111 and the y transparent conductive pattern 112 are made of ITO or the like having a higher refractive index than that of the transparent substrate 20. In this case, the transparent substrate 20, the x transparent conductive pattern 111, and the y transparent conductive pattern 112 are transparent. The presence of the x transparent conductive pattern 111 and the y transparent conductive pattern 112 is likely to be visually recognized by an observer due to the difference in optical refractive index between the conductive pattern 112 and the conductive pattern 112. Here, according to the example shown in FIG. 52A, by interposing the invisible layer 21 between the transparent substrate 20 and the x transparent conductive pattern 111, the region where the x transparent conductive pattern 111 is provided, and the x transparent conductive pattern It is possible to reduce a difference in light transmittance and reflectance between the region where the pattern 111 is not provided. This prevents the presence of the x transparent conductive pattern 111 from being viewed by an observer. Such an invisible layer 21 can be configured, for example, by using a material having a higher refractive index than materials such as ITO constituting the x transparent conductive pattern 111 and the y transparent conductive pattern 112.

As shown in FIG. 52B, the support member 20A including the transparent substrate 20 may further include a guard layer 22 provided on the transparent substrate 20, and the buffer layer 60 may be provided on the guard layer 22. . Here, the guard layer 22 is a layer for appropriately releasing static electricity that may be generated when the display front plate 40 is manufactured, and is made of, for example, ITO having conductivity and transparency.

Even when the support member 20A further includes layers and members other than the transparent substrate 20 as described above, the buffer layer 60 is preferably directly on the surface of the support member 20A on the viewer side or the display unit side. Provided. For this purpose, for example, the buffer layer 60 is formed by applying a coating solution containing the material of the buffer layer 60 on the support member 20A. Thus, the buffer layer 60 provided on the support member 20A can be obtained without interposing a sheet or film between the support member 20A and the buffer layer 60.
It is possible to prevent the low refractive index layer 31 from being broken and the low refractive index layer 31 from being left depressed.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Example)
Hereinafter, the results of preparing four types of antireflection films 30 and performing a scratch resistance test on each antireflection film 30 will be described.

First, a transparent substrate 20 was prepared. Next, four types of materials (materials 1 to 4) having different compositions were prepared as materials for the buffer layer 60. Each material is obtained by blending a predetermined monomer with a polymer such as urethane acrylate described above as the material of the buffer layer 60. In addition, the composition of each material is suitably adjusted so that the ratio of the Vickers hardness or the amount of elastic deformation of the four types of buffer layers 60 obtained is different.

Next, coating solutions containing the above materials 1 to 4 were prepared, and then each coating solution was coated on the transparent substrate 20. Thereafter, the coating solution was exposed at an exposure amount of 300 mJ using an ultrahigh pressure mercury lamp, and then baked at 230 degrees for 30 minutes. As a result, four types of buffer layers 60 (first to fourth buffer layers 60) were formed.

A Vickers indenter was pushed into each of the obtained first to fourth buffer layers 60 with a load of 5 mN, and the above-mentioned Vickers hardness and elastic deformation ratio were measured. As a result, in the first buffer layer 60, the Vickers hardness was 70, and the ratio of the amount of elastic deformation was 0.63. In the second buffer layer 60, the Vickers hardness was 58, and the elastic deformation ratio was 0.56. Further, in the third buffer layer 60, the Vickers hardness was 64, and the ratio of the amount of elastic deformation was 0.58. Moreover, in the 4th buffer layer 60, the Vickers hardness was 64 and the ratio of the amount of elastic deformation was 0.67.

Next, a coating liquid containing a material for the low refractive index layer 31 was applied on each of the first to fourth buffer layers 60. Thereafter, vacuum drying was performed, and then the coating solution was exposed with an exposure amount of 600 mJ using a low-pressure mercury lamp. As a result, the antireflection film 30 composed of the low refractive index layer 31 was formed on each buffer layer 60.

The four types of antireflection films 30 (first to fourth antireflection films 30) thus obtained were tested for scratch resistance. Specifically, steel wool (No. 0000) loaded with 100 g was swept on each antireflection film 30 (10 reciprocations, 100 mm stroke). Thereafter, whether or not scratch marks were visually recognized on each antireflection film 30 was visually confirmed. As a result, scratch marks were not visually recognized.

(Comparative example)
First, a transparent substrate 20 was prepared. Next, a coating liquid containing a material for the low refractive index layer 31 was applied on the transparent substrate 20. Thereafter, vacuum drying was performed, and then the coating solution was exposed with an exposure amount of 600 mJ using a low-pressure mercury lamp. As a result, the antireflection film 30 composed of the low refractive index layer 31 was formed on the transparent substrate 20.

The resulting antireflection film 30 was subjected to a scratch resistance test in the same manner as in the above-described example. As a result, scratch marks were visually recognized. In the comparative example, since the buffer layer 60 is not provided between the antireflection film 30 and the transparent substrate 20, it is considered that the stress applied to the antireflection film 30 could not be relieved.

(Additional examples)
As shown in FIG. The results of further preparing 13 types of display front plates 40 of 1 to 13 and conducting a scratch resistance test on the antireflection film 30 of each display front plate 40 will be described.

First, a transparent substrate 20 made of glass having an optical refractive index of 1.51 was prepared. Next, a material in which the absolute value of the difference from the optical refractive index of the transparent substrate 20 was 0.03 or less was prepared as a material for the buffer layer 60. For example, a material having an optical refractive index of 1.52 to 1.53 was prepared. Next, a coating liquid containing a material for the buffer layer 60 was prepared, and then the coating liquid was applied on the transparent substrate 20. As a result, the buffer layer 60 was provided directly on the transparent substrate 20. No. In each of the display front plates 40 of 1 to 13, the thickness of the buffer layer 60, the Vickers hardness when the Vickers indenter is pushed into the buffer layer 60 with a load of 5 mN, and the total deformation amount of the buffer layer 60 at that time The ratio of the amount of elastic deformation of the buffer layer 60 with respect to is shown in FIG.

Next, a coating solution containing a material for the low refractive index layer 31 was applied on the buffer layer 60. As a result, the low refractive index layer 31 was provided directly on the buffer layer 60. As in the case of the above-described second embodiment shown in FIG. 6, the low refractive index layer 31 is a low refractive index layer including a binder resin portion 31a and a plurality of hollow fillers 31b dispersed in the binder resin portion 31a. A refractive index layer 31 was employed. The light refractive index of the low refractive index layer 31 as a whole including the binder resin portion 31a and the hollow filler 31b was in the range of 1.33 to 1.34. No. The thickness of the low refractive index layer 31 in each of the display front plates 40 of 1 to 13 is shown in FIG.

For comparison, as shown in FIG. As the 14 display front plates, a display front plate not including the buffer layer 60 was prepared.

No. A scratch resistance test was performed on the low refractive index layers 31 of the display front plates 1 to 14. Specifically, steel wool (No. 0000) loaded with 100 g was swept on each low refractive index layer 31 (10 reciprocations, 100 mm stroke). The dimension of the steel wool in the direction parallel to the sweep direction and in the direction perpendicular to the sweep direction was 10 mm. Thereafter, whether or not scratch marks were visually recognized in each low refractive index layer 31 was visually confirmed. The results are shown in FIG. In the evaluation results shown in FIG. 53, “S” means that no scratch mark was visually recognized, and “A”, “B”, and “C” were 1 to 10, 11 to 20, respectively. This means that 21 and 30 to 30 scratch marks were visually recognized. “D” means that 31 or more scratch marks were visually recognized, but the low refractive index layer 31 was not peeled off. On the other hand, “NG” means that the low refractive index layer 31 has been peeled off.

No. The evaluation results of the display front plate 40 of Nos. 1 to 13, As can be seen from the comparison with the evaluation results of the display front plate 14, the buffer layer 60 having a light refractive index and thickness larger than the light refractive index and thickness of the low refractive index layer 31 is formed between the transparent substrate 20 and the low refractive index layer. It was possible to prevent the low refractive index layer 31 from being peeled off. Furthermore, no. Evaluation results for the display front plate 40 of Nos. 1 to 4, 6, and 8 to 13, As can be seen from the comparison with the evaluation results of the display front plates 40 of 5 and 7, the thickness of the buffer layer 60 is set to 0.5 μm or more, and the thickness of the low refractive index layer 31 is set to 120 nm or less, for example, 100 nm or less. As a result, the number of scratch marks formed can be suppressed to 30 or less. No. Evaluation results of the display front plate 40 of Nos. 1 to 4 and 11 to 13, As can be seen from the comparison with the evaluation results of the display front plate 40 of 6, 8 to 10, the thickness of the low refractive index layer 31 is in the range of 90 to 120 nm, and the Vickers hardness of the buffer layer 60 is 50 to 100. By setting the ratio of the elastic deformation amount to the total deformation amount in the buffer layer 60 within the range, and the ratio of the elastic deformation amount to 0.55 or more, the number of scratch marks formed can be suppressed to 20 or less. Furthermore, no. The evaluation results of the display front plate 40 of Nos. 1 to 4 and 12; As can be seen from the comparison with the evaluation results of the display front plate 40 of 13 and 14, the number of scratch marks formed can be suppressed to 10 or less by setting the thickness of the buffer layer 60 to 1 μm or more. It was. In addition, no. Nos. 1 and 4 and the evaluation results for the display front plate 40; As can be seen from the comparison with the evaluation results of the display front plate 40 of 2, 3 and 11, the Vickers hardness of the buffer layer 60 is in the range of 60 to 90, and the elastic deformation with respect to the total deformation amount in the buffer layer 60 By setting the ratio of the amount to 0.60 or more, no scratch marks could be formed.

DESCRIPTION OF SYMBOLS 10 Design layer 20 Transparent substrate 30 Antireflection film 31 Low refractive index layer 31a Binder resin part 31b Hollow filler 32 High refractive index layer 35 Additional antireflection film 36 Additional low refractive index layer 36A Additional low refractive index layer 37 Additional high refractive index layer 40 Display Front Plate 40A Display Front Plate with Touch Panel Function 41 Recess 50 Display Unit 60 Buffer Layer 65 Additional Buffer Layer 70 Display Device 80 Pressing Body 90 Display Front Plate 91 Breaking Section 95 Display Front Plate 96 Concave 97 Buffer Layer 100 Adhesive layer 101 Adhesive layer 105 Protective layer 110 Touch panel sensor 111 x transparent conductive pattern 111a x electrode unit 111b x connecting part 112 y transparent conductive pattern 112a x electrode unit 112b x connecting part 113 outgoing wiring 114 outgoing wiring 115 terminal part 116 for touch panel sensor Substrate 117 Insulating layer DESCRIPTION OF SYMBOLS 19 Protective layer 120 Sensor part 125 Signal processing part 151 Display unit 152 Liquid crystal unit 154 Observer side polarizing plate 155 LCD panel 155A LCD panel with a touch panel function 156 Light source side polarizing plate 157 Optical compensation film 158 Backlight unit 163 Light emitting layer 164 Reflecting electrode Layer 200 Color filter 200A Touch panel sensor integrated color filter 201 Color filter substrate 202 Black matrix layer 203 Colored layer 210 TFT substrate 215 Liquid crystal layer 220 Intermediate product

Claims

In the display front plate disposed on the viewer side with respect to the display unit
A support member including at least a transparent substrate;
A buffer layer provided on the observer side or the display unit side of the support member;
An antireflection film provided on the buffer layer,
The antireflection film has a low refractive index layer located on the outermost surface,
The light refractive index of the low refractive index layer is smaller than the light refractive index of the transparent substrate of the support member,
A light refractive index of the buffer layer is larger than a light refractive index of the low refractive index layer, and a thickness of the buffer layer is larger than a thickness of the low refractive index layer. Front plate for display.
The thickness of the low refractive index layer is in the range of 90 to 120 nm,
The buffer layer has a thickness of 0.5 μm or more,
The Vickers hardness when the Vickers indenter is pushed into the buffer layer with a load of 5 mN is in the range of 50 to 100, and the elastic deformation amount of the buffer layer with respect to the total deformation amount of the buffer layer at that time The display front plate according to claim 1, wherein the ratio is 0.55 or more.
The Vickers hardness when the Vickers indenter is pushed into the buffer layer with a load of 5 mN is in the range of 60 to 90, and the elastic deformation amount of the buffer layer with respect to the total deformation amount of the buffer layer at that time The display front plate according to claim 2, wherein the ratio of is not less than 0.60.
The display front plate according to any one of claims 1 to 3, wherein the buffer layer is provided directly on an observer side of the transparent substrate of the support member.
The antireflection film further includes a high refractive index layer provided on the display unit side of the low refractive index layer,
The display front plate according to claim 4, wherein a light refractive index of the high refractive index layer is larger than a light refractive index of the transparent substrate of the support member.
6. The display before display according to claim 4, wherein an absolute value of a difference between a light refractive index of the buffer layer and a light refractive index of the transparent substrate of the support member is 0.03 or less. Face plate.
An additional buffer layer provided on the display portion side of the support member;
An additional antireflection film provided on the display portion side of the additional buffer layer, and
The additional antireflection film has an additional low refractive index layer located on the outermost surface on the display unit side,
The optical refractive index of the additional low refractive index layer is smaller than the optical refractive index of the transparent substrate of the support member, and the thickness of the additional low refractive index layer is in the range of 90 to 120 nm,
The additional buffer layer has a thickness of 0.5 μm or more,
The Vickers hardness when the Vickers indenter is pushed into the additional buffer layer with a load of 5 mN is within a range of 50 to 100, and the additional buffer layer has a total deformation amount with respect to the total deformation amount of the additional buffer layer. The display front plate according to claim 4, wherein a ratio of the elastic deformation amount is 0.55 or more.
An additional antireflection film provided on the display side of the support member;
The additional antireflection film has an additional low refractive index layer located on the outermost surface on the display unit side,
The optical refractive index of the additional low refractive index layer is smaller than the optical refractive index of the transparent substrate of the support member and larger than the optical refractive index of the low refractive index layer of the antireflection film,
7. The display front plate according to claim 4, wherein the additional low refractive index layer has a thickness in a range of 90 to 120 nm.
The additional antireflection film further includes an additional high refractive index layer provided on the observer side of the additional low refractive index layer,
The display front plate according to claim 7 or 8, wherein a light refractive index of the additional high refractive index layer is larger than a light refractive index of the transparent substrate of the support member.
4. The display front plate according to claim 1, wherein the buffer layer is provided directly on the display portion side of the transparent substrate of the support member.
The antireflection film further has a high refractive index layer provided on the observer side of the low refractive index layer,
The display front plate according to claim 10, wherein a light refractive index of the high refractive index layer is larger than a light refractive index of the transparent substrate of the support member.
The display device according to claim 10 or 11, wherein an absolute value of a difference between a light refractive index of the buffer layer and a light refractive index of the transparent substrate of the support member is 0.03 or less. Face plate.
The display front plate according to claim 1, further comprising a touch panel sensor including a sensor unit.
The display front plate according to claim 13, wherein the sensor unit is formed on a surface of the transparent member on an observer side or a surface on a display unit side of the support member.
A display unit that emits light for displaying images to the viewer side;
A display front plate disposed on the viewer side with respect to the display unit,
The display front plate is
A buffer layer provided on the observer side or the display unit side of the support member including at least the transparent substrate;
An antireflection film provided on the buffer layer,
The antireflection film has a low refractive index layer located on the outermost surface,
The light refractive index of the low refractive index layer is smaller than the light refractive index of the transparent substrate of the support member,
A light refractive index of the buffer layer is larger than a light refractive index of the low refractive index layer, and a thickness of the buffer layer is larger than a thickness of the low refractive index layer. Display device.