WO2013094476A1 - 表示装置用前面保護板、及び表示装置 - Google Patents

表示装置用前面保護板、及び表示装置 Download PDF

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Publication number
WO2013094476A1
WO2013094476A1 PCT/JP2012/082067 JP2012082067W WO2013094476A1 WO 2013094476 A1 WO2013094476 A1 WO 2013094476A1 JP 2012082067 W JP2012082067 W JP 2012082067W WO 2013094476 A1 WO2013094476 A1 WO 2013094476A1
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WIPO (PCT)
Prior art keywords
display device
layer
infrared transmission
shielding layer
infrared
Prior art date
Application number
PCT/JP2012/082067
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
恵範 林田
中村　剛
中澤　伸介
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to CN201280028661.4A priority Critical patent/CN103597533B/zh
Priority to JP2013532775A priority patent/JP5392641B1/ja
Priority to KR1020137025056A priority patent/KR101919173B1/ko
Publication of WO2013094476A1 publication Critical patent/WO2013094476A1/ja

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a front protective plate for a display device and a display device including the same.
  • the present invention relates to a front protective plate for a display device in which an infrared transmission window that transmits infrared light is provided in an opaque region that shields visible light, and a display device including the same.
  • touch panels have been rapidly spread as position input devices used in combination with display panels in various display devices such as smartphones and tablet PCs (personal computers).
  • Various types of touch panels such as an electromagnetic induction method and a resistance film method, have been known for a long time.
  • a capacitive touch panel capable of multi-touch multi-point simultaneous input has attracted particular attention.
  • FIG. 6 is a plan view schematically showing a mobile phone typically having a touch panel function such as a smartphone as an example of the display device 200.
  • a mobile phone with a touch panel function is close to the human skin to prevent malfunction of the touch panel when the mobile phone is put on the ear during a call or to extend the battery life by turning off the display panel.
  • It has a human sensor that senses An infrared sensor is used as the human sensor.
  • the human sensor is normally provided with an infrared transmission window 4 in a part of a case 50 fitted with a front protective plate 40 for a display device, and an area inside the case overlapping the infrared transmission window 4. Is installed.
  • FIG. 7 is a diagram schematically illustrating an example of main components of the display device 200 including the touch panel 20 illustrated in FIG. In FIG. 7, the case 50 provided with the infrared transmission window 4 is not shown.
  • 7 (a) is an exploded plan view
  • FIG. 7 (b) is a display when the front protective plate 40 for display device is cut along the line CC shown in the exploded plan view of FIG. 7 (a). It is sectional drawing which shows the front surface protection board 40 for apparatuses.
  • the touch panel 20 is disposed on the front side (the front side of the paper surface in FIG. 7A) that is the light output side of the display light from the display panel 30 with respect to the display panel 30.
  • a display device front protective plate 40 is disposed on the front side of the touch panel 20 from which the display light from the display panel 30 is emitted (JP2009-1993587A, JP3153931U, JP2008-). 266473A).
  • the display device front protective plate 40 is normally provided with an opaque region A2 on the outer periphery of the display region A1, and the opaque region A2 is a shield for blocking visible light. Layer 5 is formed.
  • the opaque area A2 conceals the wiring 9 and connectors disposed on the outer peripheral portion of the touch panel 20 disposed on the back side of the display device front protective plate 40 so as not to impair the appearance.
  • visible information 6 such as a product logo is appropriately provided in the opaque area A2, and the opaque area A2 also serves as a decorative portion of the front protective plate 40 for display device.
  • the gap between the two is filled with a resin layer without a gap, and these are closely stacked.
  • various forms such as integration of the front protective plate 40 for the display device and the touch panel 20 or integration of the touch panel 20 and the display panel 30 are available in order to meet demands for reduction in thickness, weight reduction, number of parts, etc. It has been proposed (JP 2009-193857A, JP 3153971U).
  • an infrared transmission window 4 is provided on the front protective plate 40 for a display device. That is, the infrared transmission window 4 is not provided in the case 50 of the display device 200, but is placed in the front protective plate 40 for the display device, thereby increasing the degree of freedom in product design and supporting a wider range of designs. Because it becomes possible to do.
  • the infrared transmission window 4 is provided on a part of the front protective plate 40 for display device, and the area of the front protective plate 40 for display device is increased accordingly, so that the outer frame portion of the case 50 is A thin design is also possible.
  • the shielding layer 5 is usually formed by screen printing, and its film thickness is as thick as 6 to 10 ⁇ m, for example. For this reason, when the space between the front protective plate 40 for the display device and the touch panel 20 is filled with a resin layer, there is a problem that air tends to remain as residual bubbles in the vicinity of the edge step caused by the film thickness of the shielding layer 5. .
  • a transparent electrode made of a conductive thin film for position detection of the touch panel 20 is formed by a sputtering method or the like.
  • the problem of the edge step caused by the thickness of the shielding layer 5 can be improved by forming the shielding layer 5 thinly to 5 ⁇ m or less.
  • the problem of bubbles and disconnection can be improved by forming the shielding layer 5 not by the screen printing method but by the photolithography method using a photosensitive resin.
  • the shielding layer 5 was formed by photolithography using a photosensitive resin, it was found that another new problem exists. That is a problem that the adhesiveness under high temperature and high humidity is reduced, which is not generated when the thickness of the shielding layer 5 is large as the shielding layer 5 is formed by the screen printing method.
  • an object of the present invention is to provide an infrared transmission window in an opaque region in which a shielding layer is formed while improving the adhesion deterioration of the shielding layer under high temperature and high humidity in the front protective plate for a display device. It is. Another object of the present invention is to provide a display device including a front protective plate for a display device provided with such an infrared transmission window.
  • the front protective plate for a display device has a central display region and an opaque region that is provided on the outer periphery of the display region and shields visible light, and is part of the opaque region.
  • a front protective plate for a display device provided with an infrared transmission window that transmits infrared light, A translucent substrate; A shielding layer formed in the opaque region on at least one side of the first surface of the translucent substrate and the second surface opposite to the first surface, and shields at least visible light.
  • a portion that becomes the infrared transmission window is a shielding layer formed as a non-forming portion;
  • the infrared transmission layer is formed in the entire region between the shielding layer including the non-forming portion that becomes the infrared transmission window and the translucent substrate.
  • the shielding layer contains a color pigment that may contain a black pigment in a resin binder made of a cured product of a photosensitive resin
  • the infrared transmission layer contains a color pigment in a resin binder made of a cured product of a photosensitive resin
  • the color pigments of the infrared transmission layer may include at least three kinds of color pigments different from each other in color other than black.
  • the infrared transmitting layer is disposed between the light transmitting substrate and the shielding layer adjacent to the light transmitting substrate and the shielding layer. Also good.
  • the first surface of the translucent substrate faces the front side, and the infrared transmission layer is disposed on the second surface of the translucent substrate. It may be.
  • the shielding layer has one surface adjacent to the infrared transmission layer and the other surface located on the opposite side of the one surface, A transparent electrode for position detection of the touch panel is further formed on the other surface side of the shielding layer, The transparent electrode may extend from the display region to the opaque region and be electrically connected to the opaque wiring disposed in the region overlapping the shielding layer in the opaque region.
  • a display device includes a front protective plate for a display device having any one of the above characteristics and a display panel.
  • the display panel may be disposed on the one surface side of the translucent substrate.
  • a touch panel is further provided between the front protective plate for the display device and the display panel, and the touch panel extends from a region overlapping the display region to a region overlapping the opaque region.
  • an opaque wiring arranged in a region overlapping with the shielding layer, The transparent electrode may be electrically connected to the opaque wiring in a region overlapping with the opaque region.
  • the display panel may be a liquid crystal panel or an electroluminescent panel.
  • an infrared transmission window is provided in an opaque region in which the shielding layer is formed while improving the adhesion deterioration of the shielding layer under high temperature and high humidity. Can do.
  • FIG. 1A and FIG. 1B are views for explaining an embodiment of a front protective plate for a display device according to the present invention.
  • FIG. 1A is a plan view
  • FIG. FIG. 1B is a cross-sectional view taken along the line CC shown in FIG.
  • FIG. 2 is a graph illustrating the relationship between visible light and a transmittance spectrum in the infrared transmission layer.
  • FIG. 3 is a cross-sectional view illustrating another embodiment of the front protective plate for a display device according to the present invention.
  • 4A is a plan view of the front protective plate for a display device shown in FIG. 3, and FIG. 4B is a partial view showing the transparent electrode shown in FIG. 4A.
  • FIG. 5 is a cross-sectional view schematically illustrating an embodiment of a display device including the display device front protective plate shown in FIG.
  • FIG. 6 is a plan view showing an example of a conventional display device provided with an infrared transmission window.
  • FIG. 7 is a diagram schematically illustrating an example of main components of the display device illustrated in FIG. 6.
  • FIG. 7A illustrates an exploded plan view
  • FIG. 7B illustrates FIG.
  • FIG. 8 is a cross-sectional view showing another example of a conventional front protective plate for a display device.
  • FIG. 9 is a sectional view showing still another example of a conventional front protective plate for a display device.
  • the “front side” is a side where display light is emitted from the display panel 30 when the display device front protection plate 10 is used in combination with the display panel 30 in the display device front protection plate 10 or other components. Yes, it means the side where the image from the display panel 30 is observed.
  • the “back side” means the side opposite to the “front side”, and means the side of the display device front protective plate 10 or other components on which the display light of the display panel 30 enters. It is arbitrary which one of the “first surface” and the “second surface” is the “front side” and which is the “front side”. In the present embodiment, the surface on which the shielding layer 3 and the infrared transmission layer 2 are necessarily provided is referred to as a “second surface”. Usually, the second surface is the back surface.
  • FIG. 1A is a plan view
  • FIG. 1B is a cross-sectional view taken along the line CC shown in FIG. 1A.
  • the display device front protective plate 10 of the present embodiment is provided in the central display area A1 and the outer periphery of the display area A1, and shields visible light.
  • An opaque region A2 is provided, and an infrared transmission window 4 that transmits infrared light is provided in a part of the opaque region A2.
  • the front protective plate 10 for a display device includes a translucent substrate 1, a first surface S1 of the translucent substrate 1, and a first surface S1.
  • a shielding layer 3 formed in the opaque region A2 on the side of the second surface S2 of the two surfaces opposite to the second surface S2, and shields infrared light as well as visible light
  • the part that becomes the infrared transmission window 4 is the shielding layer 3 formed as a non-formed part, and the opaque surface A2 on the second surface S2 side that is the one surface side, and the shielding layer 3
  • the infrared transmission layer 2 is laminated on a portion including the non-formation portion, and has an infrared transmission layer 2 that shields visible light and transmits infrared light.
  • the shielding layer 3 does not transmit infrared light, that is, has a shielding property (light shielding property) for infrared light, and therefore, the portion to be the infrared transmission window 4 is a non-formed portion.
  • the infrared transmission layer 2 covers not only the portion where the shielding layer 3 is not formed in the portion that becomes the infrared transmission window 4 but also the entire region between the translucent substrate 1 and the shielding layer 3. Is formed.
  • the infrared transmission layer 2 and the shielding layer 3 are both opaque regions on at least one of the first surface S1 and the second surface S2 of the translucent substrate 1 without being limited to the illustrated example. As long as it is formed in A2, the one surface may be either the first surface S1 or the second surface S2.
  • the shielding layer 3 is a layer containing a color pigment in a resin binder made of a cured product of a photosensitive resin.
  • the color pigment includes a black pigment made of an inorganic material such as carbon black or titanium black, and is a layer expressing black.
  • the infrared transmission layer 2 is a layer containing a color pigment in a resin binder made of a cured product of a photosensitive resin, and the color pigment is a different color and includes three types of color pigments other than black. Specifically, by including three types of red, yellow, and blue, the same black color as that of the shielding layer 3 is expressed, and the layer is an infrared transmitting layer.
  • the infrared transmission layer 2 and the shielding layer 3 are provided on the second surface S2 of the translucent substrate 1 in this order.
  • the first surface S1 is observed with the second surface S2 facing the back side and the first surface S1 facing the front side, in other words, the second surface S2 facing the touch panel 20 or the display panel 30 side. It is assumed that it is used toward the person V side.
  • the infrared transmitting layer 2 and the shielding layer 3 are both formed by applying a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin on the light-transmitting substrate 1, and forming a pattern by photolithography.
  • the total thickness of the infrared transmission layer 2 and the shielding layer 3 is formed to be 5 ⁇ m or less.
  • the infrared transmission window 4 is placed inside the opaque region A2 where the shielding layer 3 is located, at a high temperature and high humidity of the shielding layer 3. It can be provided while improving the lower adhesion.
  • the color of the infrared transmission window 4 and the color of the part without the infrared transmission window 4 can be the same color, and the product design in which the infrared transmission window 4 is inconspicuous can be achieved.
  • the color of the reflected color can be adjusted by adjusting the ratio of the three or more color pigments used in the infrared transmission layer 2.
  • the infrared transmission layer 2 is formed not only in the infrared transmission window 4 but also in the entire region of the formation portion of the shielding layer 3, the color of the opaque region A2 can be adjusted. Can be adjusted.
  • the display device front protective plate 10 has a display area A1 at the center, and an opaque area A2 that shields visible light from the outer periphery of the display area A1.
  • An infrared transmission window 4 is provided inside the opaque region A2.
  • the display area A1 is an area in which the display light from the display panel 30 can be transmitted to display an image when applied to the display panel 30 indicated by the phantom line of the two-dot chain line in the cross-sectional view of FIG. is there.
  • the opaque region A2 hides wirings, connectors, and the like arranged on the outer peripheral portion of the display panel 30, or when applied to the touch panel 20 indicated by an phantom line of a two-dot chain line in the cross-sectional view of FIG. This is an area for hiding opaque wiring, connectors and the like arranged on the outer periphery of the touch panel 20. Further, the opaque area A2 is an area that also serves as a decoration part by visible information 6 such as a color represented by the logo, a logo or a mark provided as appropriate.
  • the infrared transmission window 4 is provided in the area of the opaque area A2, and is a part that shields visible light and transmits infrared light.
  • a human sensor used for detecting infrared rays at a portion overlapping the infrared transmission window 4 of the display device to which the front protective plate 10 for display device is applied. It is possible to install infrared light utilizing parts such as.
  • the infrared light utilization component installed in the infrared transmission window 4 may be other than the human sensor, and is not particularly limited as long as it uses infrared light.
  • the infrared transmission window 4 may be used as an infrared communication port for transmitting and receiving information.
  • the display device front protective plate 10 itself has the infrared transmission window 4, it is not necessary to provide an infrared transmission window in the case of the display device. For this reason, in the case of the display device, it is also possible to make a product design in which the area surrounding the display device front protective plate 10 is wider by narrowing the frame portion surrounding the display device front protective plate 10. It becomes.
  • the infrared transmission window 4 is provided not in the case of the display device in which the front protective plate 10 for display device is housed but in the opaque region A2 of the front protective plate 10 for display device, the appearance design may be impaired. Absent.
  • the translucent substrate 1 transmits at least visible light and infrared light, and has mechanical strength capable of protecting these surfaces against the touch panel 20 and the display panel 30 to which the front protective plate 10 for a display device is applied. If it is, there will be no restriction
  • chemically strengthened glass is preferable in that it has excellent mechanical strength compared to float glass and can be made thinner by that amount.
  • Chemically tempered glass is typically glass whose mechanical properties are strengthened by a chemical method such as replacing some of ionic species in the vicinity of the surface of the glass, such as replacing sodium with potassium.
  • the infrared transmission layer 2 functions also as an adhesion strengthening layer as a base for the light-transmitting substrate 1 of the shielding layer 3, It is possible to improve a decrease in adhesion of the shielding layer 3 and the infrared transmission layer 2 to the two-layer translucent substrate 1 under high temperature and high humidity.
  • chemically tempered glass is a kind of preferred substrate as the translucent substrate 1.
  • Resin can also be used for the translucent substrate 1.
  • an acrylic resin, a polycarbonate resin, a cycloolefin resin, a polyester resin, or the like can be used as the resin.
  • the infrared transmission layer 2 illustrated in FIG. 1 is formed in a portion of the opaque region A2 of the second surface S2 of the translucent substrate 1 facing the back side which is the touch panel 20 and the display panel 30 side.
  • the infrared transmission layer 2 is provided not only in the portion of the infrared transmission window 4 in the opaque area A2 but also in the entire area thereof. In other words, in the sense of ensuring infrared transmission, it is only necessary to form only in the infrared transmission window, but in the opaque region A2, the layer between the transparent substrate 1 and the shielding layer 3 is not provided. It is also provided in all areas.
  • this infrared transmission layer 2 not only corresponds to the infrared transmission window 4 but also improves the decrease in adhesion between the shielding layer 3 and the translucent substrate 1 under high temperature and high humidity. This is because it also has a function as a reinforcing layer. Therefore, the shielding layer 3 does not directly contact the surface of the translucent substrate 1 but is formed through the infrared transmission layer 2 therebetween.
  • the infrared transmitting layer 2 serves as a base for the light-transmitting substrate 1 of the shielding layer 3 and also functions as an adhesion enhancing layer, whereby the light-transmitting substrate 1 of both the shielding layer 3 and the infrared transmitting layer 2 is used. The adhesion under high temperature and high humidity is improved.
  • the infrared transmission layer 2 is formed in the opaque region A2 in the formation part of the shielding layer 3 and the non-formation part of the shielding layer 3 constituting the infrared transmission window 4, but the infrared transmission layer 2 is the shielding layer. 3 may be formed in other regions within the opaque region A2, such as near the outside of the outer contour 3. In this case, a portion where only the infrared transmission layer 2 is formed outside the outer contour of the shielding layer 3 forms an opaque region A2 by the light shielding property of the infrared transmission layer 2 with respect to visible light.
  • the outer contour of the infrared transmitting layer 2 is slightly enlarged so as to include the outer contour of the shielding layer 3 on the inner side, and a positional deviation occurs when the infrared transmitting layer and the shielding layer 3 are formed, This can be made inconspicuous.
  • the transmittance of the infrared transmission layer 2 with respect to infrared light depends on the required specifications, expression color, and infrared components such as an infrared sensor applied to the infrared transmission window 4. Of 80% or more. In this embodiment, the transmittance is in such an infrared region.
  • the infrared region in which the transmittance is 80% or more is not necessarily a region of 780 nm or more. For example, a region of 850 nm or more can be sufficiently handled. It is sufficient that the upper limit of the infrared region where the transmittance is 80% or higher is the near infrared region, which is usually 1300 nm.
  • the infrared light-shielding layer 2 alone has a light-shielding property with respect to visible light, for example, 50% or less (optical density OD is 0.2 or more), more preferably transmission.
  • the ratio is preferably 25% or less (optical density OD 0.6 or more), more preferably 10% or less (optical density OD 1.0 or more) in transmittance.
  • the infrared transmission layer 2 has a transmittance of 80% or more at a wavelength of 850 nm or more and 1300 nm or less for the infrared light region, and a transmission of 10% or less for the visible light region. It has become a rate.
  • the transmittance is not an average value but a value for each wavelength.
  • the infrared transmission layer 2 is composed of a layer containing a color pigment in a resin binder made of a cured product of a photosensitive resin.
  • the formation method of the infrared transmission layer 2 is not particularly limited, for example, a colored photosensitive resin composition containing a color pigment and an uncured photosensitive resin is formed on the surface of the translucent substrate 1.
  • the infrared transmission layer 2 can be formed by a so-called photolithography method in which a predetermined pattern is exposed and developed.
  • the infrared transmission layer 2 is formed by a photolithography method.
  • the infrared transmission layer 2 formed by photolithography using the photosensitive resin composition is thinner than the screen printing method, and can be easily formed to, for example, 3 ⁇ m or less.
  • the film thickness of the infrared transmission layer 2 formed by photolithography using the photosensitive resin composition can be set to 0.2 to 3 ⁇ m.
  • the infrared transmission layer 2 is the same color as the shielding layer 3, for example, black, the light shielding property as the opaque region A2 may be realized by both the infrared transmission layer 2 and the shielding layer 3. Therefore, if the film thickness of the infrared transmission layer 2 is 0.3 ⁇ m or more, sufficient light shielding properties can be obtained as a whole.
  • the infrared transmission layer 2 is formed in a pattern in the opaque region A2, but the pattern formation method is not limited to the photolithography method, and the infrared transmission layer 2 and the shielding layer 3 are not limited.
  • Other pattern forming methods such as the above-described screen printing method or ink jet printing method may be used as long as the problem of the step due to the above can be solved.
  • the photolithography method is a kind of preferable forming method in that it can be thinned to a level that can effectively solve the step problem and can be easily formed with high accuracy as compared with the screen printing method. It is.
  • the color pigment used for the infrared transmission layer 2 in the present embodiment means a color pigment other than a black pigment exhibiting black, in other words, a color pigment other than black.
  • the black pigment exhibiting black are titanium black (low-order titanium oxide, titanium oxynitride, etc.), carbon black, and the like.
  • the infrared transmission layer 2 expresses black using a color pigment other than black.
  • the coloring pigment other than black for example, a red pigment, a yellow pigment, a blue pigment, a green pigment, a purple pigment, and the like can be used.
  • the infrared transmitting layer 2 is visible.
  • An optical property of shielding light but transmitting infrared light can be imparted.
  • color matching such as making the same color system as the color of the shielding layer 3 is also possible.
  • the color of the infrared transmission layer 2 is preferably the same color as the color of the shielding layer 3 in terms of the design uniformity of the opaque region A2.
  • the red pigment is, for example, a red pigment such as diketopyrrolopyrrole, anthraquinone, or perylene
  • the yellow pigment is, for example, a yellow pigment such as isoindoline or anthraquinone
  • the blue pigment is
  • it is a blue pigment such as copper phthalocyanine or anthraquinone
  • the green pigment is, for example, a green pigment such as phthalocyanine or isoindoline.
  • diketopyrrolopyrrole red pigments such as Pigment Red 254 (PR254), anthraquinone red pigments such as Pigment Red 177 (PR177), and isoindoline-based pigments such as Pigment Yellow 139 (PY139).
  • Yellow pigments copper phthalocyanine-based blue pigments such as pigment blue PB15: 6 (PB15: 6), and the like can be used.
  • PB15: 6 pigment blue PB15: 6
  • a quinacridone-based purple pigment such as pigment violet 23 (PV23) can be used.
  • a color pigment exhibiting a color other than these, that is, a hue can also be used.
  • the color pigment particles have an average particle size of 1 ⁇ m or less, preferably about 0.03 to 0.3 ⁇ m.
  • the color pigments to be contained in the infrared transmission layer 2 include at least three kinds of color pigments which are different from each other and are not black.
  • Examples of the combination of the different color pigments include three combinations of a red color pigment, a yellow color pigment, and a blue color pigment. This combination of three colors of red, yellow, and blue is preferable in that it can express black without including a black pigment by adjusting the content of the colored pigment of each color, and can express any wide range of chromatic colors.
  • the combination of the three types of color pigments composed of the three colors is preferable in that a variety of colors that are different from each other and cannot be expressed by a combination of two types of color pigments other than black can be expressed.
  • a color pigment other than three colors is further added to the combination of the three colors, such as the purple pigment
  • a wider range of colors can be expressed.
  • a purple pigment may be further included to form a combination of four types and four colors.
  • each color pigment includes an anthraquinone red pigment, a diketopyrrolopyrrole red pigment, and a yellow color pigment.
  • examples thereof include isoindoline-based yellow pigments
  • blue coloring pigments include copper phthalocyanine-based blue pigments.
  • Pigment Red 177 PR177
  • Pigment Red 254 PR254
  • PY139 Pigment Yellow 139
  • PB15: 6 Pigment Blue
  • the graph of the transmittance spectrum shown in FIG. 2 shows an example of the transmittance spectrum of the infrared transmitting layer 3 when black is expressed by a combination of three color pigments other than black as described above.
  • infrared transmission performance with a transmittance of 50% or more is obtained in the infrared region of wavelength from 800 to at least 1300 nm, more specifically in the near infrared region and at least in the near infrared region of wavelength of 1300 nm or less, and the wavelength of 850 nm.
  • infrared transmission performance with a transmittance of 90% or higher is obtained with respect to a preferable transmittance of 80% or higher.
  • the visible light region with a wavelength of 380 to 780 nm it can be seen that a sufficient light shielding property against visible light having a transmittance of 5% or less can be obtained at each wavelength.
  • black color is expressed by including three types of color pigments that are different from each other and other than black as the color pigment.
  • three or more types of color pigments to be contained are included.
  • the black color of the display area A1 in the non-display state when the backlight is turned off and the infrared that is black The display area A1 in which the color of the non-display state of the display panel 30 is reflected by bringing the color of the opaque area A2 by the transmission layer 2 and the shielding layer 3 close to each other, and the black infrared transmission layer 2 and the shielding layer 3 It is possible to adjust so that the respective colors of the opaque region A2 in which the colors are reflected are harmonized in appearance as a whole.
  • Such a color expression function by the infrared transmission layer 2 is an advantage unique to a configuration in which the infrared transmission layer 2 is formed not only in the infrared transmission window 4 but also in the entire area of the shielding layer 3 formation portion. is there.
  • the content of the color pigment in the infrared transmission layer 2 depends on the required visible light shielding properties and infrared light transmission properties, the color of the infrared transmission layer 2 containing the color pigment and the resin binder is colored with respect to the total solid content.
  • the pigment concentration, expressed as a percentage of the pigment amount is, for example, usually about 10 to 60%, preferably about 20 to 40%.
  • the color pigment is usually in the range of 10 to 60 parts by mass, preferably 20 to 40 parts by mass with respect to 100 parts by mass of the total solid content of the infrared transmitting layer 2.
  • the content of the color pigment is the total amount of the color pigments obtained by adding all the color pigments having different colors.
  • the content of the color pigment is less than this range, the ratio of the resin binder that is considered to contribute to the adhesion increases in the infrared transmission layer 2, so that the infrared transmission layer 2 particularly under high temperature and high humidity.
  • the shielding property against visible light is reduced. It is difficult to make the film thickness 5 ⁇ m or less effective in improving the step, which is not preferable.
  • the color pigment exceeds this range, it is advantageous in terms of light-shielding properties for visible light, but the effect of improving the adhesion of the infrared transmitting layer 2 itself under high temperature and high humidity is lowered, and consequently the shielding layer. 3 is not preferable in terms of the effect of improving the adhesion between the shielding layer 3 and the translucent substrate 1 under high temperature and high humidity. In order to satisfy the effect of improving the adhesion and the visible light shielding property as well as the infrared light transmittance, the above range is preferable.
  • the infrared transmitting layer 2 itself has a high temperature and high humidity when formed as a cured layer of a photosensitive resin that is advantageous in that the film thickness of the infrared transmitting layer 2 can be reduced. It has been found that the lowering of the adhesiveness underneath can be improved, and consequently the lowering of the adhesiveness between the shielding layer 3 and the translucent substrate 1 under high temperature and high humidity can be improved by passing through the infrared transmission layer 2.
  • the reference configuration example illustrated in the cross-sectional view of FIG. Like the front protective plate 50 for a display device, after forming the shielding layer 3 with the infrared transmission window 4 as a non-formed part on the translucent substrate 1, the non-formed part is subjected to infrared transmission. Forming layer 2 is sufficient. However, this configuration cannot improve the decrease in adhesion of the shielding layer 3 under high temperature and high humidity.
  • the boundary between the shielding layer 3 and the infrared transmissive material 2 is exposed through the translucent substrate 1, and the filling of the non-formed portion of the shielding layer 3 filled with the infrared transmissive material 2 becomes conspicuous.
  • the characteristic of the infrared transmission layer 2 having a light shielding property with respect to visible light is used like a front protective plate 50 for a display device as another reference configuration example illustrated in the cross-sectional view of FIG.
  • the opaque region A2 is formed only by the infrared transmission layer 2, and a necessary portion in this region is used as the infrared transmission window 4.
  • Photosensitive resin examples of the photosensitive resin that is a resin component of the resin binder for dispersing and holding the color pigment include reactive vinyl such as acrylic resin, epoxy resin, polyimide resin, polyvinyl cinnamate resin, and cyclized rubber.
  • reactive vinyl such as acrylic resin, epoxy resin, polyimide resin, polyvinyl cinnamate resin, and cyclized rubber.
  • One or more photosensitive resins having a photoreactive group such as a group can be used.
  • the acrylic resin for example, a photosensitive resin composed of an alkali-soluble resin, a polyfunctional acrylate monomer, a photopolymerization initiator, and other additives can be used as a resin component of the resin binder.
  • the alkali-soluble resin one or more kinds of methacrylic acid ester copolymer such as benzyl methacrylate-methacrylic acid copolymer, cardo resin such as epoxy acrylate having a bisphenol fluorene structure, and the like can be used.
  • the polyfunctional acrylate monomer include trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like. The above can be used.
  • (meth) acrylate means either methacrylate or acrylate.
  • alkylphenone series 2, oxime ester series, triazine series, titanate series and the like
  • alkylphenone series (2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Irgacure (registered trademark) 907, manufactured by BASF Japan Ltd.)
  • an oxime ester system 1,2-octanedione, 1- [ 4- (Phenylthio) phenyl]-, 2- (O-benzoyloxime) (Irgacure (registered trademark) OXE01, manufactured by BASF Japan Ltd.) and the like can be used.
  • the resin binder of the infrared transmitting layer 2 can contain various known additives such as a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.
  • the formation method of the infrared transmitting layer 2 is not particularly limited in the present embodiment, but includes three or more predetermined color pigments in the resin binder including the uncured photosensitive resin.
  • the infrared transmitting layer 2 can be formed by the colored photosensitive resin composition to be formed.
  • the colored photosensitive resin composition may further contain a solvent for adjusting the coating suitability when the resin composition is applied on the surface of the light-transmitting substrate 1.
  • the solvent for example, one or more of propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl cellosolve, 3-methoxybutyl acetate and the like can be used.
  • a colored photosensitive resin composition containing an uncured product of a color pigment and a photosensitive resin, or an uncured product of the colored pigment and the photosensitive resin has been conventionally adjusted as a color filter application.
  • a colored resist may be used.
  • the method of applying the colored photosensitive resin composition on the surface of the translucent substrate 1 is, for example, by a known coating method such as spin coating, roll coating, die coating, spray coating, or bead coating. Can do.
  • patterning is performed through a predetermined process such as exposure, development, baking, and the like using a photolithography technique.
  • An infrared transmission layer 2 having a predetermined pattern can be formed on a part of the surface.
  • the shielding layer 3 in the embodiment illustrated in FIG. 1 is an opaque region A2 that is the back side of the translucent substrate 1 facing the touch panel 20 and the display panel 30, that is, the second surface S2 side of the translucent substrate 1. It is formed in the area. More specifically, the shielding layer 3 is formed in the entire region except the portion of the infrared transmission window 4 in the opaque region A2. By the shielding layer 3 and the infrared transmission layer 2, an opaque region A2 is formed as a region opaque to visible light.
  • the shielding layer 3 together with the infrared transmissive layer 2 that has a light shielding property to visible light, is arranged at the center of the touch panel 20 on the outer periphery with respect to the position detection region at the center, or the center of the display panel 30.
  • the wirings and control circuits arranged on the outer periphery of the display area are hidden so that these wirings and control circuits are not visible.
  • the shielding layer 3 has a function of preventing the appearance from being impaired in the display device using the touch panel 20 or the display panel 30.
  • the shielding layer 3 only needs to shield at least visible light, and the necessary light shielding property for visible light as the opaque region A2 is determined by the shielding layer 3 and the light shielding property in the visible light portion of the infrared transmission layer 2. Realize it. Therefore, the light shielding property as the shielding layer 3 alone may be small and the film thickness can be reduced accordingly. However, in the case of expressing black, the shielding layer 3 can contain carbon black and a black pigment having excellent light shielding properties even if the film thickness is thinner than carbon black, such as titanium black. . Therefore, even if the shielding layer 3 is thin, sufficient shielding properties against visible light can be obtained.
  • the shielding layer 3 can easily achieve a light shielding property with an optical density of OD 5.0 (1 / 100,000 in transmittance) with a film thickness of 1.5 ⁇ m.
  • the shielding property against visible light as the opaque region A2, that is, the light shielding property may be obtained by the shielding layer 3 and the infrared transmission layer 2.
  • the light shielding properties of both the shielding layer 3 and the infrared transmission layer 2 are 3% or less (1 at the optical density OD) in terms of transmittance, although depending on the required specifications and expression color. 0.5 or more), more preferably 1% or less in transmittance (optical density OD2.0 or more), and even more preferably 0.01% or less (optical density OD4.0 or more) in transmittance.
  • the shielding layer 3 itself containing a black pigment, in particular, adheres to the translucent substrate 1, particularly the translucent substrate 1 made of chemically strengthened glass, under high temperature and high humidity. May cause a problem of lowering.
  • the infrared transmitting layer 2 can be formed by the infrared transmission layer 2.
  • the shielding layer 3 is always laminated on the translucent substrate 1 via the infrared transmission layer 2, the shielding layer 3 is displayed when black is expressed only by the shielding layer 3 as in this embodiment.
  • the infrared transmission layer 2 includes a portion where the shielding layer 3 is formed and an infrared transmission window 4 which is a portion where the shielding layer 3 is not formed on the side of the transparent substrate 1 which is the front side of the shielding layer 3. It is laminated in the area. For this reason, since the appearance color of the opaque region A2 can be made into a single leaf color including the portion of the infrared transmission window 4, the infrared transmission window 4 can be provided with a design that does not feel strange.
  • the shielding layer 3 is composed of a layer containing a color pigment that may contain a black pigment in a resin binder made of a cured product of a photosensitive resin.
  • the method for forming the shielding layer 3 is basically not particularly limited.
  • a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin is applied on the surface of the translucent substrate 1. Thereafter, it can be formed by a so-called photolithography method in which exposure is performed in a predetermined pattern and development is performed.
  • the shielding layer 3 is formed by photolithography.
  • the shielding layer 3 formed by the photolithography method using the photosensitive resin composition is thinner than the screen printing method and has a thickness of 5 ⁇ m or less, more preferably 1.5 ⁇ m or less and 3 ⁇ m or less.
  • the total of the shielding layer 3 and the infrared transmission layer 2 generated at the boundary between the formation part and the non-formation part of these two layers in the laminated portion where the shielding layer 3 and the infrared transmission layer 2 overlap each other can be easily performed. This is preferable in that the edge step due to the film thickness can be reduced.
  • the thickness of the shielding layer 3 formed by photolithography using the photosensitive resin composition can be set to 0.2 to 3 ⁇ m.
  • the film thickness of the shielding layer 3 is 0.5 ⁇ m or more, and the necessary light shielding property can be obtained as a whole.
  • the thickness of the shielding layer 3 is preferably 0.5 ⁇ m or more in consideration of the black shielding property.
  • the shielding layer 3 is formed in a pattern in the opaque region A2, but the pattern forming method is not limited to the photolithography method, and the shielding layer 3 and the infrared transmission layer 2 are formed.
  • Other pattern forming methods such as the above-described screen printing method or inkjet printing method may be used as long as the problem of the edge step due to the total film thickness can be solved.
  • the photolithography method is a kind of preferable forming method in that it can be thinned to a level that can effectively solve the step problem and can be easily formed with high accuracy as compared with the screen printing method. It is.
  • any of black pigments exhibiting black and color pigments other than black can be used.
  • the black pigment exhibiting black color for example, titanium black (low-order titanium oxide, titanium oxynitride, etc.), carbon black, or the like can be used. Titanium black has the same concentration and the same film thickness as carbon black, and a higher light-shielding property for visible light can be obtained. It is a kind of preferable black pigment.
  • the coloring pigment other than black for example, a red pigment, a yellow pigment, a blue pigment, a green pigment, a purple pigment, and the like can be used.
  • the content of the color pigment is a pigment expressed as a percentage of the amount of the color pigment with respect to the total solid content of the shielding layer 3 including the color pigment and the resin binder, although it depends on the required light-shielding property against visible light and color.
  • the concentration is, for example, about 10 to 70%. In order to ensure sufficient light shielding properties, it is desirable that the pigment concentration be as high as possible.
  • Photosensitive resin As the photosensitive resin serving as the resin component of the resin binder that disperses and holds the color pigment, the resins listed in the infrared transmission layer 2 can be used. For this reason, further explanation is omitted.
  • a product logo mark is formed as visible information 6 in an opaque region A ⁇ b> 2 where the infrared transmission layer 2 and the shielding layer 3 are formed.
  • the opaque region A2 in addition to the product logo mark, characters, symbols, patterns, etc. for operation explanation can be provided as the visible information 6.
  • the visible information 6 is formed, for example, as a pattern of a non-formed part in which the non-formed part of the infrared transmissive layer 2 and the non-formed part of the shielding layer 3 are arranged so as to overlap each other, or Between the conductive substrate 1 and the infrared transmitting layer 2 or the shielding layer 3, it can be formed as a layer having a pattern different in color. When the layer is formed as a layer having a different color from the infrared transmission layer 2 or the shielding layer 3, the visible information 6 can be formed using the same material and method as the infrared transmission layer 2 or the shielding layer 3. .
  • the infrared transmission layer including the non-forming part on the back side of the part where the non-forming part of the infrared transmitting layer 2 and the non-forming part of the shielding layer 3 are arranged so as to overlap each other.
  • a metal thin film such as aluminum formed by vapor deposition such as vapor deposition or sputtering can also be used between 2 and the shielding layer 3.
  • the visible information 6 formed in the opaque region A2 is not necessarily opaque to the same degree as the light shielding property by the infrared transmitting layer 2 and the shielding layer 3 because it is in the region of the opaque region A2.
  • it may be visible information 6 such as characters and symbols for operation explanation illuminated from the back so as to be understood even in a dark place.
  • it does not interfere with concealing the wiring etc. which are arrange
  • the visible information 6 formed as a pattern of non-formed parts arranged so that the three non-formed parts overlap each other, in other words, recognized by the outer contour being defined by the infrared transmitting layer 2 and the shielding layer 3
  • the visible information 6 has a lower light-shielding property than the infrared transmission layer 2 such that the visible information 6 is higher in transmittance than the surrounding portion, typically a transparent portion. May exist.
  • the front protective plate 10 for a display device of the present embodiment can take other forms other than the forms described above. Some of these will be described below.
  • the front protective plate 10 for a display device includes a translucent substrate 1, an infrared transmission layer 2, and a shielding layer 3, provided with an infrared transmission window 4, and visible information. It was a form example having 6 as well. However, in the present embodiment, other components may be further provided.
  • One example is integration with a touch panel function.
  • a transparent electrode for a touch panel may be provided on the translucent substrate 1, and the translucent substrate 1 may also be used as a touch panel substrate.
  • the integration with the touch panel function is a form in which a part of the functions necessary as the touch panel is integrated, the effect of reducing the number of parts and reducing the thickness can be obtained. More preferably, all the necessary functions as a touch panel are integrated.
  • the front protective plate 10 for a display device that integrates all the functions necessary for a touch panel can also be called a touch panel.
  • the front protective plate 10 for a display device that integrates a part of functions necessary as a touch panel can also be referred to as a touch panel member.
  • a part of the touch panel function is integrated, in a method that requires a transparent electrode for position detection as the touch panel function, at least the transparent electrode is integrated with the front protective plate 10 for a display device.
  • Various types of touch panel position detection methods have been conventionally known. In the position detection method in which the transparent electrode has two layers, at least one of these, more preferably two layers, is provided on the front protective plate 10 for a display device. It is desirable to integrate it into Hereinafter, an example of integration of the touch panel function will be described with reference to the embodiment of FIG.
  • the transparent electrode 8 and the wiring 9 for the touch panel are further formed on the second surface S2 side on which the infrared transmission layer 2 and the shielding layer 3 are formed.
  • the transparent electrode 8 for the touch panel is a projected capacitive electrode.
  • the shielding layer 3 has one surface S3 adjacent to the infrared transmission layer 2 and the other surface S4 located on the opposite side of the one surface S3.
  • a transparent electrode 8 for detecting the position of the touch panel is further formed on the surface S4 side, and extends from the display area A1 to a portion of the opaque area A2 where the infrared transmission layer 2 and the shielding layer 3 are present.
  • the opaque wiring 9 disposed in the region overlapping the layer 3 is electrically connected to the opaque region A2.
  • the illustration of the infrared transmission window 4 is omitted in order to prevent complication of the drawing.
  • FIG. 4A and 4B schematically show the pattern shape of the transparent electrode 8.
  • FIG. 4 In the example shown in the figure, a plurality of first transparent electrodes 8a extending in a first direction (vertical direction in the figure) and a second direction (horizontal direction in the figure) perpendicular to the first direction are extended.
  • the plurality of second transparent electrodes 8b are insulated from each other and formed on the same side of the translucent substrate 1, that is, the second surface S2.
  • FIG. 4A shows an infrared transmission window 4 and visible information 6 provided in the opaque region A2.
  • Various types of patterns are known for this type of projected capacitive transparent electrode 8 and will be briefly described here.
  • FIG. 4 as shown in the partial plan view of FIG.
  • one first transparent electrode 8a connects a plurality of rhombus-shaped large area portions 8aL and the adjacent large area portions 8aL to each other.
  • the connecting portion 8aC and a take-out portion (not shown) that extends to the outer periphery of the position detection region and is electrically connected to the wiring 9 are configured.
  • one second transparent electrode 8b is also composed of a plurality of rhombus-shaped large area portions, connecting portions that connect the adjacent large area portions, and an extraction portion.
  • FIG. 4A only the large area part is drawn about each transparent electrode 8a, 8b, and illustration of the connection part and the extraction part is abbreviate
  • the large area part of the transparent electrode 8a and the large area part of the transparent electrode 8b are formed on the same plane.
  • the large area part 8aL and the connection part 8aC are formed as a continuous layer on the same plane.
  • an overcoat layer 7b is provided as an insulating layer at a portion intersecting the transparent electrode 8a (specifically, at the connection portion 8aC of the transparent electrode 8a), and the transparent electrode is straddled across the insulating layer. The insulation is ensured by forming the connection portion 8b.
  • the overcoat layer 7a By forming the overcoat layer 7a over A2, the edge step due to the infrared transmitting layer 2 and the shielding layer 3 formed with a total film thickness of 5 ⁇ m or less is further reduced. Further, a large area part, a connection part, and an extraction part of the first transparent electrode 8a are formed on the surface of the overcoat layer 7a, and only the large area part and the extraction part are formed on the second transparent electrode 8b. Yes.
  • an overcoat layer 7b is partially formed as an insulating layer at a portion where the transparent electrode 8a and the second electrode 8b intersect, and then the second transparent electrode A connecting portion of the electrode 8b passes over the overcoat layer 7b and spans a large area portion of the adjacent transparent electrode 8b.
  • the first transparent electrode 8a and the second transparent electrode 8b extend from the central position detection region to a region overlapping the shielding layer 3, and are connected to the wiring 9 that is opaque and visible.
  • the wiring 9 is drawn only with respect to the first transparent electrode 8a in the drawing.
  • an overcoat layer 7c is formed on almost the entire second surface S2 of the translucent substrate 1 on which the wiring 9 is formed after the wiring 9 is formed, and the first transparent electrode 8a and the second transparent electrode 8a are formed.
  • the surface as the front protective plate 10 for a display device including the surface of the transparent electrode 8b is protected from scratches.
  • the overcoat layer 7c is not formed in a portion where the wiring 9 is connected to the control circuit via the flexible printed circuit board (FPC), and the wiring 9 is exposed.
  • a transparent resin such as an epoxy resin, an acrylic resin, or a polyimide resin can be used. Epoxy resin or the like can be used.
  • the photosensitive resin described in the infrared transmission layer 2 and the shielding layer 3 can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming.
  • at least the overcoat layer 7b serving as an insulating layer at the intersection of the first transparent electrode 8a and the second transparent electrode 8b is transparent and has electrical insulation. ing.
  • These overcoat layers can be formed by the same coating method as the infrared transmission layer 2 and the shielding layer 3.
  • the first transparent electrode 8a and the second transparent electrode 8b include ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), AZO (Aluminum Zinc Oxide; aluminum zinc oxide). It is possible to use a pattern formed by forming a transparent conductor thin film such as the above.
  • the wiring 9 for example, a metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum can be used.
  • the wiring 9 can be a metal layer of an alloy (also referred to as APC) made of silver, palladium and copper, which is formed by sputtering and then patterned by photolithography.
  • the appearance is not impaired.
  • the infrared transmitting layer 2 between the translucent substrate 1 and the shielding layer 3 there is a problem that the reflectance related to the shielding layer 3 is high or the adhesion is lowered under high temperature and high humidity. It has been improved. Furthermore, the problem of the level difference due to the total of the two layers of the shielding layer 3 and the infrared transmission layer 2 has also been improved.
  • the transparent electrode is extended to the portion of the shielding layer 3 laminated on the infrared transmission layer 2, The possibility of disconnection can be reduced. Furthermore, it also has a touch panel function, which is effective for reducing the number of parts and reducing the weight.
  • the display device according to the present embodiment includes the display device front protective plate 10 and the display panel.
  • the display device according to the present embodiment may include a touch panel when the display device front protective plate 10 does not have a touch panel function.
  • the display device according to the present embodiment includes the display device front protective plate 10, the touch panel, and the display panel, and the touch panel is an opaque wiring disposed around the transparent electrode for position detection. May be arranged so as to overlap the shielding layer 3 of the display device front protective plate 10 and be invisible from the display device front protective plate 10 side.
  • the display device according to the present embodiment may include a display device front protective plate 10 having a transparent electrode for a touch panel and opaque wiring, and a display panel.
  • FIG. 5 shows an embodiment of a display device according to the present invention.
  • a display device 100 shown in FIG. 5 includes a display device front protective plate 10, a touch panel 20, and a display panel in order from the front side on the observer V side above the drawing. 30.
  • the display device front protective plate 10 is the display device front protective plate 10 described above. More specifically, the display device front protective plate 10 has a form in which the touch panel function is not integrated.
  • the touch panel 20 schematically shows the wiring 9 and the transparent electrode 8.
  • Infrared parts such as a human sensor are provided as components of the display device 100 on the back side (downward in the drawing) of the infrared transmission window 4 provided on the front protective plate 10 for the display device. Illustration of this infrared component is omitted.
  • the touch panel 20 is typically a projected capacitive touch panel capable of multi-touch (multi-point simultaneous input). In addition to this, a surface capacitive method, a resistive film method, an electromagnetic induction method, and the like. Any of various known position detection touch panels including a position detection method that does not require a transparent electrode, such as an optical method, may be used.
  • the touch panel 20 has some opaque components such as a wiring 9, a control circuit, and a connector for electrically connecting them to the outer periphery of the central position detection region.
  • the touch panel 20 and the display device front protective plate 10 are arranged so that these opaque components overlap with the shielding layer 3 in the opaque region A2 of the display device front protective plate 10 in a plan view. ing. For this reason, opaque components such as the wiring 9 can be prevented from deteriorating the appearance of the display device 100.
  • the display panel 30 is typically a liquid crystal display panel or an electroluminescent (EL) panel, but may be an electronic paper panel, a display device using a cathode ray tube, or various known display panels.
  • EL electroluminescent
  • the display device 100 configured as described above, a product design in which the infrared transmission window 4 is incorporated in the front protective plate 10 for the display device is possible, and the outer periphery of the position detection region of the touch panel 20 or Various components such as wiring, connectors, and control circuits that are present in the outer periphery of the display area of the display panel 30 and are unnecessary for the display content itself are hidden to prevent the appearance from being damaged. it can.
  • the display device front protective plate 10 has a form in which no touch panel function is integrated.
  • the display device front protective plate 10 included in the display device 100 may be integrated with part or all of the touch panel function.
  • the display device is configured to include at least. In this form, it is possible to hide wiring, connectors, control circuits, and the like on the outer peripheral portion of the display panel 30.
  • the touch panel to be incorporated is of a type having a transparent electrode
  • the transparent electrode is composed of two layers of a first transparent electrode 8a and a second transparent electrode 8b which are insulated from each other.
  • one of these substrates can be used as the transparent substrate 1 of the front protective plate 10 for display device so that one transparent electrode can be formed.
  • the other transparent electrode and the substrate are incorporated as touch panel components separate from the display device front protective plate 10 and the display panel 30 to form the display device 100. It is also possible. What is necessary is just to select the structure suitable for various conditions, such as the manufacturing equipment which can be used, an assembly process, as what structure the front protection board 10 for display apparatuses and a touchscreen function are integrated.
  • Apps of the display device front protective plate 10 and the display device 100 according to the present embodiment are not particularly limited.
  • a mobile phone such as a smartphone
  • a portable information terminal such as a tablet PC
  • a personal computer such as a personal computer
  • a car navigation system such as a digital camera
  • an electronic notebook such as a game machine
  • an automatic ticket vending machine an ATM terminal, a POS terminal, and the like.
  • the light-transmitting substrate 1 and the shielding layer 3 formed in the opaque region A2 on the side of at least one surface of the light-transmitting substrate 1 include at least visible light.
  • the portion that becomes the infrared transmission window 4 is a shielding layer 3 formed as a non-forming portion, and a portion that is in the opaque region A2 on the one surface side and includes the non-forming portion of the shielding layer 3
  • the infrared transmission layer 2 serves as an infrared transmission window 4.
  • the infrared transmission window 4 can be made inconspicuous.
  • the case of the display device 100 can be adapted to a wider range of designs.
  • the appearance design is not impaired.
  • the infrared transmitting layer 2 can contain a pigment different from that of the shielding layer 3, and as a result, it becomes easier to adjust the color as compared with the shielding layer 3. That is, when the other surface side of the translucent substrate 1 is the front side, the infrared transmission layer 2 is disposed closer to the viewer side than the shielding layer 3, so that the opaque region A 2 perceived by the user. It becomes easy to adjust the color of the reflected color.
  • the infrared transmitting layer 2 can contain a pigment different from that of the shielding layer 3, and as a result, compared to a case where the shielding property required for the opaque region A2 is realized only by the shielding layer 3, The reflectance can be kept low. As a result, reflection of external light can be suppressed and an image from the display device 100 can be displayed with high contrast.
  • the shielding layer 3 includes a colored pigment that can contain a black pigment in a resin binder made of a cured product of a photosensitive resin, and the infrared transmitting layer 2 contains a colored pigment in a resin binder made of a cured product of a photosensitive resin.
  • the color pigments of the infrared transmission layer 2 are different from each other and contain at least three types of color pigments other than black, three or more types of colors used for the infrared transmission layer 2 are included.
  • the total film thickness of the infrared transmission layer 2 and the shielding layer 3 can be formed thin, and the edge step caused by these film thicknesses can be reduced.
  • the shielding layer 3 has one surface S3 adjacent to the infrared transmission layer 2 and the other surface S4 located on the opposite side of the one surface S3, and the other surface S4 of the shielding layer 3 is present.
  • a transparent electrode 8 for detecting the position of the touch panel is formed on the side, and the transparent electrode 8 extends from the display area A1 to the opaque area A2 and is opaque with the opaque wiring 9 disposed in the area overlapping the shielding layer 3.
  • the infrared transmission layer 2 is interposed between the translucent substrate 1 and the shielding layer 3.
  • the infrared transmitting layer 2 is disposed between the light transmitting substrate 1 and the shielding layer 3 adjacent to the light transmitting substrate 1 and the shielding layer 3.
  • the high-temperature, high-humidity between the infrared transmission layer 2 and the shielding layer 3 is ensured while sufficiently ensuring the adhesion between the infrared-transmission layer 2 and the translucent substrate 1 under high temperature and high humidity. Adhesion below can be sufficiently secured. Accordingly, it is possible to more effectively improve the decrease in adhesion between the shielding layer 3 and the translucent substrate 1 through the infrared transmission layer 2 under high temperature and high humidity.
  • the touch panel 20 is further provided between the display device front protective plate 10 and the display panel 30, and the touch panel 20 extends from the region overlapping the display region A1 to the opaque region A2.
  • a transparent electrode 8 extending to a region overlapping with the shielding layer 3, and an opaque wiring 9 disposed in a region overlapping with the shielding layer 3.
  • the transparent electrode 8 is electrically connected to the opaque wiring 9 in a region overlapping with the opaque region A2. It is connected to the.
  • the opaque wiring 9 overlaps with the shielding layer 3 in the opaque region A2 of the front protective plate 10 for display device and is hidden and viewed.
  • Example 1 As the translucent substrate, chemically tempered glass having a thickness of 0.5 mm was used, and an infrared transmissive layer was formed on the outer peripheral portion of one side used as the back side of the chemically tempered glass.
  • the infrared transmission layer was formed to a thickness of 2.5 ⁇ m by patterning a composition containing a pigment and a resin binder made of a photosensitive resin that is cured by ultraviolet irradiation by a photolithography method.
  • the resin binder did not contain black pigments such as titanium black and carbon black, but contained three kinds of organic coloring pigments, each of which is red, yellow, and blue, as shown below. In other words, the three colors were mixed to give a black color.
  • the resin binder was a color filter colored layer resist (colored resist) using an acrylic resin.
  • -Red pigment Diketopyrrolopyrrole pigment red 254 (PR254)
  • Yellow pigment Isoindoline pigment yellow 139 (PY139)
  • -Blue pigment copper phthalocyanine pigment blue PB15: 6 (PB15: 6)
  • a shielding layer was formed on the surface of the infrared transmission layer, with the portion serving as the infrared transmission window being a non-formed portion.
  • This shielding layer was formed to a thickness of 0.9 ⁇ m by patterning a composition containing a black pigment and a resin binder made of a photosensitive resin that is cured by ultraviolet irradiation by a photolithography method.
  • the black color pigment was made to have a black color by containing carbon black.
  • the resin binder was a black resist for black stripes of a color filter using an acrylic resin.
  • the total film thickness of the infrared transmission layer and the shielding layer was 3.4 ⁇ m.
  • Example 2 In Example 1, a front protective plate for a display device was produced in the same manner as in Example 1 except that the thickness of the infrared transmission layer was reduced to 2.1 ⁇ m and the total film thickness was 3.0 ⁇ m.
  • Example 3 is the same as Example 1 except that the film thickness of the infrared transmission layer is reduced to 1.1 ⁇ m, and the film thickness of the shielding layer is increased to 1.2 ⁇ m and the total film thickness is 2.3 ⁇ m. In the same manner, a front protective plate for a display device was produced.
  • Example 4 is the same as Example 1 except that the film thickness of the infrared transmission layer is reduced to 0.5 ⁇ m and the film thickness of the shielding layer is increased to 1.4 ⁇ m and the total film thickness is 1.9 ⁇ m. In the same manner, a front protective plate for a display device was produced.
  • Example 5 is the same as Example 1 except that the film thickness of the infrared transmission layer is reduced to 0.3 ⁇ m, and the film thickness of the shielding layer is increased to 1.5 ⁇ m and the total film thickness is 1.8 ⁇ m. In the same manner, a front protective plate for a display device was produced.
  • Example 1 the material for forming the infrared transmission layer is changed to a transparent resist having the same resin binder and no coloring pigment including the black pigment, and the film thickness is 1.5 ⁇ m instead of the infrared transmission layer. A transparent resin layer was formed. Others were the same as in Example 1, and a front protective plate for a display device having a total film thickness of 3.0 ⁇ m with the shielding layer was produced.
  • Example 2 a front protective plate for a display device was prepared in the same manner as in Example 1 except that the formation of the infrared transmitting layer was omitted and only the shielding layer was formed with a thickness of 1.5 ⁇ m.
  • Example 3 In Example 1, the formation of the infrared transmitting layer was omitted, and the material for forming the shielding layer was changed to a black ink for screen printing containing carbon black as a black pigment, and this was screen printed to obtain a film thickness.
  • a front protective plate for a display device was produced in the same manner as in Example 1 except that only the 6.0 ⁇ m shielding layer was formed.
  • Optical density (OD; Optical Density): The light shielding property against the transmitted light in the visible light region alone was evaluated by the optical density only in the infrared transmitting layer or in the entire visible light region in which the infrared transmitting layer and the shielding layer were laminated. This optical density depends on the intensity Iin of incident light perpendicularly incident on the part of the infrared transmission layer alone (the part of the infrared transmission window) or the part where the infrared transmission layer and the shielding layer are laminated, and the transmission transmitted vertically. The ratio to the light intensity Iout is “log 10 (Iin / Iout)”. When the OD value is 4.0, the visible light transmittance is 1/10000.
  • the OD value is 4.0 or more, it is sufficiently satisfactory as a black opaque region.
  • a transparent resin layer is provided in place of the infrared transmission layer, only the transparent resin layer or a laminated portion of the transparent resin layer and the shielding layer is a measurement target.
  • the spectral characteristics are measured for incident light that is perpendicularly incident from the translucent substrate side and transmitted light that has passed through the front protective plate for the display device. The optical density was calculated using the brightness Y in the XYZ color system according to JIS-Z8701 obtained as above.
  • Incident light incident from the side of the translucent substrate on the part where the shielding layer formed on the back side is present is transmitted through the interface between the shielding layer and the translucent substrate or when there is an infrared transmitting layer between them.
  • the ratio of the intensity Iref of the reflected light and the intensity Iin of the incident light was evaluated as a percentage calculated by (Iref / Iin) ⁇ 100.
  • the influence of the reflected light generated at the interface between the translucent substrate and the air can be ignored.
  • an infrared transmission layer is present and its optical density is small, a part of reflected light from the interface between the infrared transmission layer and the shielding layer is included and measured.
  • the reflected light at the interface between the transparent resin layer and the shielding layer was measured.
  • the spectral characteristics are measured for incident light that enters perpendicularly from the translucent substrate side and the reflected light from the front protective plate for the display device. The reflectance was calculated using the brightness Y in the XYZ color system according to JIS-Z8701 obtained.
  • the adhesion of the shielding layer to the translucent substrate under high temperature and high humidity is as follows.
  • the test piece is left in an environment of a temperature of 60 ° C. and a relative humidity of 95% RH for a maximum of 400 hours, and at the beginning of the test, 20 hours, 100 hours,
  • the adhesion of the shielding layer every 400 hr was measured and evaluated as follows.
  • an intervening layer such as an infrared transmitting layer is interposed between the shielding layer and the translucent substrate, the adhesion as a laminate of the intervening layer and the shielding layer is evaluated.
  • the adhesion was evaluated according to the cross-cut tape method of JIS K5400 (1990). That is, from the shielding layer of the test piece, a 1 mm wide cut was made with a cutter knife to make 100 squares made of 1 mm square, and cellophane adhesive tape (Nichiban Co., Ltd.) was made from above the squares. 1 to 2 minutes after attaching (manufactured), hold one end of the cellophane adhesive tape, hold it at right angles to the surface of the test piece, and peel it off instantaneously. Evaluated by evaluation score.
  • the evaluation score is 10 points for the best and 0 points for the worst. 10 points: Each cut is thin, both ends are smooth, and there is no peeling of the grid. 8 points: There is a slight peeling at the intersection of the cuts, but there is no peeling of the grid, and the area of the defect is within 5% of the entire grid. 6 points: There is peeling at both sides of the cut and the intersection, and the area of the defect is 5 to 15% of the entire grid. 4 points: The width of peeling due to cuts is wide, and the area of the defect is 15 to 35% of the entire grid. 2 points: The width of peeling due to cuts is wider than 4 points, and the area of the defect is 35 to 65% of the entire grid. 0 point: The area of the missing part is 65% or more of the entire grid.
  • Table 1 shows the main contents and performance evaluation results of the layer structures on the light-transmitting substrates of Examples and Comparative Examples.
  • Example 1 as a basic performance, even if the total film thickness of the infrared transmission layer and the shielding layer is set to 3.4 ⁇ m of 5 ⁇ m or less, which can improve the step problem, the light shielding property is ensured to be 5.0 at the optical density OD.
  • the reflectance was 3.0% or less.
  • satisfactory optical performance as an opaque region by the infrared transmission layer and the shielding layer as basic performance was obtained.
  • a black pigment such as carbon black or titanium black is not used as a coloring pigment, but red, yellow, blue Black is expressed by the combination of three kinds of coloring pigments.
  • the transmittance of the infrared transmission layer with respect to infrared light was 50% or more at a wavelength of 800 nm, and 90% or more at a wavelength of 850 to 1300 nm.
  • the adhesion of the shielding layer under high temperature and high humidity is evaluated at 10 points even after a test time of 400 hours, and a sufficient performance (evaluation “ ⁇ ” in Table 1) is obtained with no decrease observed in the initial state. It was.
  • the thickness of the infrared transmission layer is decreased in this order so that the optical density OD5.0 can be maintained, and the thickness of the shielding layer is increased accordingly.
  • a film thickness of 3.0 ⁇ m or less could be realized while maintaining the optical density OD5.0.
  • the reflectance increased to 3.65%. This indicates that the optical density of the infrared transmission layer should be increased in order to keep the reflectance low.
  • the infrared transmitting layer can be used to reduce the thickness of the infrared transmitting layer to 0.5 ⁇ m or more and further reduce the reflectance. It can be confirmed that the film thickness should be, for example, 1.5 ⁇ m or more.
  • the adhesion of the shielding layer to the light-transmitting substrate under high temperature and high humidity is the same as in Examples 2 to 5 including the case where the film thickness of the infrared transmission layer is as thin as 0.3 ⁇ m. Even after the test time of 400 hours, the evaluation score was 10, and no deterioration was observed with respect to the initial state, and sufficient performance (evaluation “ ⁇ ” in Table 1) was obtained.
  • Comparative Example 2 with only the shielding layer is based on a black matrix resist for a color filter that expresses black with a black pigment. Even when the film thickness is as thin as 1.5 ⁇ m, an optical density OD value of 5.0 and high light shielding properties are obtained. On the other hand, the reflectance is 4.78%, which may greatly deteriorate the appearance, and the adhesiveness has already started to decrease after the test time of 20 hours, and the adhesiveness is not satisfactory performance (in Table 1, the evaluation “ ⁇ ”).
  • Comparative Example 3 is only a shielding layer of screen printing ink expressing black with a black pigment, but there is no problem in optical performance and adhesion of optical density OD and reflectance, but the film thickness for that is 6.0 ⁇ m. There is a problem of the level difference caused by this.
  • this ink shielding layer is light-shielding against infrared light, and if an infrared transmission window is provided as a non-forming part, that part becomes a translucent feeling of the translucent substrate. It is not preferable as a design.

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  • Engineering & Computer Science (AREA)
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  • General Engineering & Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Position Input By Displaying (AREA)
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