JP2022020436A - Display device - Google Patents

Abstract

To provide a display device capable of preventing reflection of golden color or a metallic color close to golden color from being generated from a curved edge of a surface panel having a surface on which an antireflection film is formed.SOLUTION: A surface panel 10 includes a translucent substrate 15, and an antireflection film 16 that covers the front surface of the translucent substrate 15 and contains metal molecules. At a boundary between the translucent substrate 15 and the antireflection film 16 on an edge having a curved surface of the surface panel 10, a compensation colored layer 21 is provided that is green or blue, or a mixed color of green and blue, while a decorative layer 17 is provided as a back portion. Reflected light can be prevented from appearing in gold or the like by absorption of light having wavelengths of red and yellow in the compensation colored layer 21.SELECTED DRAWING: Figure 3

Description

The present invention relates to a display device having a surface panel covering a display member and having an antireflection film provided on the surface of the surface panel.

Patent Document 1 describes an invention relating to a touch panel used on a display screen in a position input device of a computer or the like.
In the present invention, a two-sided tempered glass substrate having chemically strengthened layers on the front and back is used. One surface of the glass substrate is divided into a display area and a decorative frame area formed on the outer periphery thereof. A transparent electrode functioning as a touch sensor is formed in the display area, and a resin composition containing a light-shielding pigment is applied to the decorative frame area. The peripheral edges of the glass substrate are chamfered so as to have a curved surface shape in the thickness direction.

JP-A-2015-197784

In the touch panel described in Patent Document 1, the outer peripheral portion of the glass substrate is a decorative frame region, and the peripheral end portion of the glass substrate is chamfered in front of the decorative frame region so as to have a curved surface shape. Therefore, the appearance of the peripheral end portion of the touch panel is improved.

However, since the peripheral edge of the glass substrate has a curved surface shape, the reflection state of external light on the surface of that portion is different from the reflection state of the flat region of the glass substrate, which impairs the appearance of the peripheral edge. There is a fear. In particular, when an antireflection film containing metal molecules is formed on the surface of a glass substrate, reflected light such as a metallic color may be emitted from the peripheral end portion of the curved surface shape.

The present invention solves the above-mentioned conventional problems, and in a structure in which an antireflection film is formed on a translucent substrate having a curved edge, the reflection of light impairs the appearance of the edge. It is intended to provide a display device that can be prevented.

The present invention relates to a display device provided with a display member for displaying an image and a translucent surface panel covering the front of the display member in the display direction.
The surface panel includes a translucent substrate having an edge portion whose cross-sectional shape facing forward has a protruding curve, and an antireflection film containing metal molecules covering the surface including the edge portion of the translucent substrate. , Is provided,
A correction coloring layer is provided at the junction boundary between the translucent substrate and the antireflection film at least a part of the edge portion, and the hue of the correction coloring layer is green or blue or a mixed color of green and blue. It is characterized by being.

In the display device of the present invention, when the hue of the corrected colored layer is expressed by the wavelength in the spectral characteristics of light, it is preferable that the hue is in the range of visible light and is 550 nm or less.

In the display device of the present invention, it is preferable that the hue of the corrected coloring layer is blue.

That is, when the hue of the corrected colored layer is expressed by the wavelength in the spectral characteristics of light, it is preferable that the hue is in the range of visible light and is 500 nm or less.

In the display device of the present invention, a decorative layer is provided behind the surface panel to cover a portion facing the edge portion from the rear, and the correction coloring layer can transmit a part of light. Can be configured as a thing.

In the display device of the present invention, a correction coloring layer of green or blue or a mixed color of green and blue is interposed between the translucent substrate and the antireflection film containing metal molecules at the edge of the curved surface of the surface panel. is doing. Therefore, at the edge portion, the reddish and yellowish light components of the reflected light from the interface between the translucent substrate and the antireflection film can be attenuated, and a golden color or a metallic color close to golden color can be obtained. It can be suppressed from occurring.

Front view of the display device according to the embodiment of the present invention, A cross-sectional view of the display device shown in FIG. 1 cut along line II-II. Partially enlarged view of the cross section shown in FIG. 2, Partially enlarged view corresponding to FIG. 2 showing a comparative example, Explanatory drawing comparing the spectral characteristics of light and the wavelength characteristics of gold,

The display device 1 shown in FIG. 1 is for in-vehicle use. In the cross-sectional view of FIG. 2, the Y1 direction is the front facing the display direction, and the Y2 direction is the rear.
As shown in FIG. 2, the display device 1 has a housing 2. In the passenger compartment of an automobile, the housing 2 is fixed to an instrument panel or the like. The front surface (Y1 direction) of the housing 2 is covered with the surface panel 10. A support wall portion 2b that is raised forward (in the Y1 direction) is formed around the housing 2, and the front surface (Y1 direction) of the support wall portion 2b is a fixed surface 2a. A surface panel 10 is provided in front of the housing 2.

The surface of the surface panel 10 facing the rear (Y2 direction) is adhered to and fixed to the fixing surface 2a of the housing 2 via the adhesive layer 3. Inside the housing 2, a liquid crystal display panel 5 as a display member is fixed to a surface facing the rear of the surface panel 10 via an adhesive layer 4. Inside the housing 2, the backlight module 6 is installed behind the liquid crystal display panel 5. Illumination light is applied from the rear to the transmissive liquid crystal display panel 5 from the backlight module 6, and the image displayed on the display screen of the liquid crystal display panel 5 can be visually recognized from the front through the front panel 10.

As the display member, an organic EL panel may be used instead of the liquid crystal display panel 5. Alternatively, the display member may display a fixed image or a fixed display using an LED or the like. When a liquid crystal display panel 5 or an organic EL panel is used as a display member, a car navigation image, a television image, an image showing operation information of an air conditioner, or an image showing various vehicle running information is displayed on the display screen. Is displayed. The fixed image or fixed display is a keyboard image, a push button display, or the like.

As shown in FIG. 1, the entire front surface of the display device 1 is covered with the surface panel 10. The surface panel 10 has a rectangular shape, the central portion is a rectangular display area 11, and the four sides surrounding the display area 11 are shielding areas. The shielding region has an upper shielding region 12a, a lower shielding region 12b, a left shielding region 12c, and a right shielding region 12d. A liquid crystal display panel 5 which is a display member is superposed on the display area 11 at the center of the front panel 10, and the display area 11 functions as a display screen on which an image displayed on the liquid crystal display panel 5 appears. There is.

As shown in the enlarged cross-sectional view of FIG. 3, the surface panel 10 has a translucent substrate 15. The translucent substrate 15 is a glass plate or a transparent resin plate such as an acrylic resin plate or a polycarbonate resin plate. As shown in FIGS. 2 and 3, in the right shielding region 12d, the translucent substrate 15 is covered with the decorative layer 17 from the rear. The decorative layer 17 is a colored layer formed on the rear surface 15b of the translucent substrate 15 by printing means or painting means. The hue of the decorative layer 17 is a dark color, such as black, dark green, or dark brown. Also in the upper shielding region 12a, the lower shielding region 12b, and the left shielding region 12c shown in FIG. 1, the translucent substrate 15 is covered with the decorative layer 17 from the rear.

As shown in FIG. 1, a push button display 7 which is a fixed display is provided in the lower shielding region 12b. This fixed display also functions as a display member. The push button display 7 is formed on the rear surface 15b of the translucent substrate 15 by means such as printing. On the rear surface 15b of the translucent substrate 15, a translucent touch panel is superimposed on at least a portion corresponding to the display area 11 and a portion corresponding to the push button display 7. The translucent touch panel is a capacitance detection type panel in which a plurality of transparent electrodes are formed on the surface of a translucent substrate sheet. When the operator's finger approaches or comes into contact with the front surface of the front surface panel 10 in the display area 11 and the push button display 7, it becomes possible to determine the approaching position or the contacting position of the finger by the detection signal from the touch panel.

As shown in FIGS. 2 and 3, the edge portion 20 of the surface panel 10 is a curved surface in which the cross-sectional shape of the surface facing forward is a convex curve. That is, at the edge portion 20, the front surface 15a of the translucent substrate 15 is polished to form a curved surface having a convex cross-sectional shape. The curved shape of the edge portion 20 is a partial cylindrical surface extending in a direction perpendicular to the paper surface of FIGS. 2 and 3. The curved surface of the edge portion 20 is formed on all four sides of the surface panel 10. Further, in the upper shielding region 12a, the lower shielding region 12b, the left shielding region 12c, and the right shielding region 12d, the decorative layer 17 faces the rear of the edge portion 20.

As shown in FIG. 3, on the front surface (Y1 direction) of the surface panel 10, the front surface 15a of the translucent substrate 15 is covered with the antireflection film 16. The antireflection film 16 has a lower refractive index than the translucent substrate 15, and for example, the thin films of TIO2 (titanium dioxide) and SiO2 are alternately laminated in a plurality of layers. Alternatively, the translucent substrate 15 may be quartz glass, and the antireflection film 16 may be a dielectric metal film such as MgF2, Ta2O5, or Al2O3. The antireflection film 16 in the present invention contains a metal film and contains a metal molecule.

As shown in FIG. 3, the region where the front surface 15a of the translucent substrate 15 is a curved surface is the edge portion 20 of the surface panel 10, but a partial region, preferably the entire region, of the edge portion 20 is used. In the above, the correction coloring layer 21 is provided on the joint interface between the front surface 15a of the translucent substrate 15 and the antireflection film 16. The correction coloring layer 21 is a printing layer or a coating film formed on the curved surface portion of the front surface 15a of the translucent substrate 15. The film thickness is set so that a part of the external light L can be transmitted and a part of the external light can be reflected. The correction coloring layer 21 functions as a color filter that semi-reflects light. The hue of the correction coloring layer 21 can absorb the red wavelength band, the yellow wavelength band, and the like of the reflected light from the front surface 15a of the translucent substrate 15, and is blue or green or a mixture of blue and green. Color etc.

Next, the optical function of the edge portion 20 of the surface panel 10 will be described.
The external light L is transmitted through the antireflection film 16 of the surface panel 10 and further transmitted through the translucent substrate 15, but a part of the external light L is reflected by the front surface 15a of the translucent substrate 15. However, by providing the antireflection film 16 having a refractive index smaller than that of the translucent substrate 15, the reflected light is suppressed on the flat surface portion of the surface panel 10. Further, when the antireflection film 16 has a multilayer structure in which a plurality of layers of TiO2 and layers of SiO2 are alternately stacked, a part of the external light L reflected by the front surface 15a of the translucent substrate 15 is an antireflection film. Reflection and refraction are repeated in the film of 16, and the reflection of light from the surface of the external light L is further suppressed in the flat portion of the surface panel 10.

FIG. 4 shows a comparative example. In the surface panel 10 in this comparative example, the structure of the edge portion 20 is the same as that shown in FIG. 3, but in the edge portion 20, the interface between the translucent substrate 15 and the antireflection film 16 is formed. The correction coloring layer 21 is not provided.

As shown in FIG. 4, in the edge portion 20 of the surface panel 10, the cross-sectional shape of the front surface 15a of the translucent substrate 15 is a convex curve. When a part of the external light L given to the edge portion 20 is reflected by the front surface 15a which is a curved surface, a spectral phenomenon occurs in which the light reflection direction differs depending on the wavelength of the light. FIG. 4 schematically shows the difference in the reflection direction between the three primary colors of light, blue (B), green (G), and red (R).

In the diagram of FIG. 5, the horizontal axis is the wavelength (nm) and the vertical axis is the reflectance (%) of light. Although the spectral characteristics of light are shown in FIG. 5, the wavelengths of light increase in the order of blue (B), green (G), and red (R). Light having a wavelength intermediate between blue (B) and green (G) becomes blue-green, and light having a wavelength intermediate between green (G) and red (R) becomes yellow or orange. FIG. 5 shows the dependency characteristics of the reflectance with respect to the wavelengths of gold (Au) and silver (Ag). Gold (Au) has a high reflectance at about 550 nm or more, and the wavelength band in which the reflectance is high overlaps with the wavelength band from yellow (Y) to red (R). Further, it is known that the metallic luster of gold (Au) or silver (Ag) is generated by the presence of free electrons on the surface of the metal.

As shown in FIG. 4, when the edge 20 of the surface panel 10 is viewed diagonally from the front due to the spectroscopic phenomenon, the reflected light is coordinated with blue and green according to the change in the angle of the line of sight at that time. It can be seen, or yellow and red can be seen in coordination. Further, since the antireflection film 16 contains a metal film and contains metal molecules, the reflected light reflected by the front surface 15a of the translucent substrate 15 and passing through the antireflection film 16 is due to the presence of free electrons of the metal molecules. Appears to have a metallic luster. As shown in FIG. 5, since the wavelength band in which gold (Au) is emphasized and the wavelength band in which yellow and red are coordinated overlap, the edge 20 is viewed from an angle in which yellow and red are emphasized. Then, the metallic luster makes it easier for gold or a metallic color close to gold to appear.

Since a decorative layer 17 such as black is present behind the edge 20 of the translucent substrate 15, the gold color of the light reflected by the curved front surface 15a against the dark color of the decorative layer 17 as a background. Metallic colors such as are further emphasized and appear. As a result, in the comparative example shown in FIG. 4, when viewed from the front, the edge portion 20 looks like black, which is the hue of the decorative layer 17, but as shown in FIG. 4, the edge portion 20 is seen from the diagonally front. When looking at, the gold color or a metal color close to gold color is reflected and appears, which impairs the appearance of the shielding regions 12a, 12b, 12c, and 12d.

In the display device 1 of the embodiment of the present invention shown in FIG. 3, a correction coloring layer 21 is provided between the front surface 15a of the translucent substrate 15 and the antireflection film 16 at the edge 20 of the surface panel 10. .. The correction coloring layer 21 is thin enough to allow a part of light to pass through. Therefore, when the display device 1 is viewed from the front, the dark color of the decorative layer 17 behind the correction coloring layer 21 is emphasized, and the correction coloring layer 21 itself is inconspicuous.

The correction coloring layer 21 absorbs and does not reflect light in at least the red color and the wavelength band around it. For that purpose, it is preferable that the hue of the correction coloring layer 21 is green or blue or a mixed color of green and blue. For example, the hue of the corrected colored layer 21 is preferably in the range of visible light and 550 nm or less when expressed in terms of the wavelength in the spectral characteristics of light shown in FIG.

In the edge portion 20 of the surface panel 10, a correction coloring layer 21 having the above-mentioned optical characteristics is provided between the curved front surface 15a of the translucent substrate 15 and the antireflection film 16. The correction coloring layer 21 functions as a semi-reflective color filter. Therefore, as shown in FIG. 3, when the edge portion 20 is viewed diagonally from the front, at least the red light and the light in the wavelength band around it among the reflected light from the front surface 15a are absorbed by the correction coloring layer 21. , It is attenuated as reflected light. As a result, it becomes possible to suppress the appearance of gold or a metallic color close to gold on the edge portion 20 when viewed from diagonally forward.

Further, in order to prevent gold or a metallic color close to gold from appearing when the edge 20 is viewed, the correction coloring layer 21 should not absorb and reflect light in a wavelength band showing not only red but also yellow. For that purpose, it is more preferable that the hue of the correction coloring layer 21 is blue. For example, when the hue of the corrected colored layer 21 is expressed by the wavelength in the spectral characteristics of light shown in FIG. 5, it is preferable that the hue is in the range of visible light and is 500 nm or less.

1 Display device 2 Housing 5 Liquid crystal display panel (display member)
7 Push button display 10 Surface panel 11 Display area 12a, 12b, 12c, 12d Shielding area 15 Translucent substrate 16 Antireflection film 17 Decorative layer 20 Edge 21 Corrected coloring layer

Claims (5)

In a display device provided with a display member for displaying an image and a translucent surface panel covering the front of the display member in the display direction.
The surface panel includes a translucent substrate having an edge portion whose cross-sectional shape facing forward has a protruding curve, and an antireflection film containing metal molecules covering the surface including the edge portion of the translucent substrate. , Is provided,
A correction coloring layer is provided at the junction boundary between the translucent substrate and the antireflection film at least a part of the edge portion, and the hue of the correction coloring layer is green or blue or a mixed color of green and blue. A display device characterized by being present. The display device according to claim 1, wherein when the hue of the corrected colored layer is expressed by a wavelength in the spectral characteristics of light, the hue is in the range of visible light and is 550 nm or less. The display device according to claim 1, wherein the hue of the corrected colored layer is blue. The display device according to claim 3, wherein when the hue of the corrected colored layer is expressed by a wavelength in the spectral characteristics of light, the hue is in the range of visible light and is 500 nm or less. Any of claims 1 to 4, wherein a decorative layer is provided behind the surface panel to cover the portion facing the edge portion from the rear, and the correction coloring layer can transmit a part of light. Display device described in Crab.

Images