Patent Application
20190094419
The present disclosure relates to a cover component that covers a surface of a display panel of an in-vehicle display device, a mobile device, or the like and a transfer film used for manufacturing the cover component.
In the related art, in an in-vehicle device, a mobile device, or the like having a display function, a cover component is used for the purpose of protecting a surface of a display panel such as a liquid crystal panel or an organic EL panel, preventing the surface from being stained, or decorating an edge of the display panel (For example, PTLs 1 and 2).
In such a cover component, for example, a hard coat layer having functions of protecting a display panel and preventing the display panel from being stained and a decorative layer having a decorating function are provided on a transparent substrate. The decorative layer includes a colored layer having a frame shape and a transmissive region provided inside the colored region. The transmissive region is a space for displaying contents of the display panel. The colored region is a region for imparting a design to the edge of the display panel.
The light generated from an inside of the display panel, such as backlight of the liquid crystal panel or light generated from the organic EL panel itself, may pass through the transmissive region and cause a viewer to dazzle. In addition, light outside the display panel, such as sunlight or illumination light, may reflect on the surface of the cover component to cause glitter (also called glare) to the viewer.
Therefore, in the hard coat layer, it is conceivable that a fine uneven shape is provided on a surface of a region overlapping with the transmissive region of the decorative layer. When providing the fine uneven shape on a surface of the hard coat layer, light from an inside of a display panel side and light from the outside of the display panel can be diffused in the hard coat layer and dazzling to the viewer can be reduced.
PTL 1: Japanese Patent Unexamined Publication No. 2002-189107
PTL 2: Japanese Patent Unexamined Publication No. 2013-230652
According to the present disclosure, a cover component covering a surface of a display panel, includes: a decorative layer that includes a colored region having a frame shape and a transmissive region provided on an inside of the colored region; and an anti-reflection layer that includes an anti-reflection region having a fine uneven shape formed on at least one surface of the anti-reflection layer, in which the anti-reflection layer overlaps the decorative layer, and the anti-reflection region covers the transmissive region and protrudes into the colored region over a whole inner peripheral portion of the colored region.
According to the cover component according to the present disclosure, the anti-reflection region having the fine uneven shape formed at least one surface covers the transmissive region and protrudes into the colored region over the whole inner peripheral portion of the colored region. Therefore, even when a positional shift occurs between the anti-reflection region and the transmissive region, since the anti-reflection region overlaps the transmissive region, it is possible to reduce the above-described light leakage and glare and prevent a quality of the cover component from deteriorating.
Before explaining embodiments, problems in the related art will be briefly explained.
In a hard coat layer having functions of protecting a display panel and preventing the display panel from being stained, in an aspect in which a fine uneven shape is provided only in a region overlapping with a transmissive region, alignment between the fine uneven shape and the transmissive region has to be strictly performed. That is, when there is even a slight positional shift between the fine uneven shape and the transmissive region, a region where the fine uneven shape and the transmissive region do not overlap in plan view is generated. Light inside the display panel leaks from the non-overlapping region to the outside and may cause the viewer to dazzle. (Hereinafter, leakage of the light inside the display panel to the outside is simply referred to as “light leakage”.). Light outside the display panel is reflected in the non-overlapping region to generate glare and may cause the viewer to dazzle.
An object of the present disclosure is to prevent the quality from deteriorating due to light leakage or glare, in a cover component of the display panel.
Hereinafter, cover component 1 of Embodiment 1 will be described with reference to the drawings.
Hard coat layer 42 is a transparent resin layer such as a layer of polyethylene terephthalate (PET), and is provided at the outermost surface of cover component 1. Hard coat layer 42 overlaps decorative layer 48 below hard coat layer 42. Decorative layer 48 includes colored region 43 having a frame shape and transmissive region 41 provided inside the colored region. Transmissive region 41 is a space for displaying contents of the display panel. However, transmissive region 41 may be a light-transmissive material fitted inside colored region 43.
Adhesive layer 50 for bonding with transmissive substrate 45 is provided below decorative layer 48. A thickness of hard coat layer 42 is, for example, approximately 5 μm. A thickness of decorative layer 48 is, for example, approximately several m. A thickness of adhesive layer 50 is, for example, approximately 1 to 5 μm. A thickness of transmissive substrate 45 is, for example, 2 mm.
Hard coat layer 42 includes anti-reflection region 46 and region 44 around anti-reflection region 46. Fine uneven shape 46a is provided on a surface of anti-reflection region 46. Anti-reflection region 46 covers transmissive region 41 of decorative layer 48 and protrudes into colored region 43 over a whole inner peripheral portion of colored region 43. That is, fine uneven shape 46a overlaps transmissive region 41 and protrudes to an inside of colored region 43 in a plan view (as viewed from a direction perpendicular to each layer). The surface of region 44 around anti-reflection region 46 has a smooth shape.
According to cover component 1 of the present embodiment, it is possible to prevent the quality of the cover component from deteriorating. For example, in hard coat layer 42, in an aspect in which a fine uneven shape is provided only in a region overlapping with transmissive region 41, alignment between anti-reflection region 46 and transmissive region has to be strictly performed. That is, when there is even a slight positional shift between anti-reflection region 46 and transmissive region 41, a region where anti-reflection region 46 and transmissive region 41 do not overlap in plan view is generated. Light inside the display panel, such as backlight or light generated from the organic EL leaks from the non-overlapping region to the outside and may cause the viewer to dazzle. In addition, light outside the display panel, such as sunlight or illumination light is reflected in the non-overlapping region to generate glare and may cause the viewer to dazzle.
On the other hand, according to cover component 1 of the present disclosure, anti-reflection region 46 in which fine uneven shape 46a is provided on a surface covers transmissive region 41 and protrudes into colored region 43 over the whole inner peripheral portion of colored region 43. Therefore, even when a positional shift occurs between anti-reflection region 46 and transmissive region 41, since anti-reflection region 46 overlaps transmissive region 41, it is possible to reduce the above-described light leakage and glare and prevent a quality of the cover component from deteriorating.
Here, in the present embodiment, transmissive region 41 and anti-reflection region 46 have rectangular shapes having a long side and a short side in plan view. When a length of the long side of anti-reflection region 46 is represented as Ax, a length of the short side of anti-reflection region 46 is represented as Ay, a length of the long side inside colored region 43 is represented as Bx, the length of the short side inside colored region 43 is By, and colored region 43 is positioned at the center of anti-reflection region 46 in plan view, it is preferable that conditions of 0.05 mm≤(Ax−Bx)/2≤0.25 mm and 0.05 mm≤(Ay−By)/2≤0.25 mm are satisfied. (Ax−Bx)/2 is a dimension that anti-reflection region 46 protrudes into colored region 43 in a long side direction. (Ay−By)/2 is a dimension that anti-reflection region 46 protrudes into colored region 43 in a short side direction.
In a case where a dimension that anti-reflection region 46 protrudes into colored region 43 is less than 0.05 mm in each side, a region in which anti-reflection region 46 and transmissive region 41 do not overlap when cover component 1 is viewed obliquely is generated, and light leakage and glare may occur. On the other hand, in a case where the dimension that anti-reflection region 46 protrudes into colored region 43 is more than 0.25 mm, fine uneven shape 46a becomes conspicuous in colored region 43. Therefore, there is a design problem. Accordingly, it is preferable to satisfy the above conditions. In the drawings, the dimension that anti-reflection region 46 protrudes into colored region 43 is drawn exaggeratingly in order to explain the contents of the present embodiment.
In fine uneven shape 46a provided on the surface of anti-reflection region 46, it is preferable that an arithmetic average roughness (Ra) is more than 0.08 μm and less than 0.2 μm and a root mean average roughness (Rms) is more than 80 nm and less than 200 nm. The reason why is as follows. In a case where the arithmetic average roughness (Ra) is 0.08 μm or less, the antiglare property decreases. On the other hand, in a case where the arithmetic average roughness (Ra) is more than 0.2 μm, a light diffusing effect increases and white blur in a screen occurs. In addition, the reason why is as follows. In a case where the root mean average roughness (Rms) is 80 nm or less, the antiglare property decreases. On the other hand, in a case where the root mean average roughness (Rms) is more than 200 nm, diffusion of light increases and the white blur in the screen occurs.
It is preferable that fine uneven shape 46a includes uneven shapes having two-steps of size (first uneven shape 46aa and second uneven shape 46ab) as shown in
A material of the transmissive substrate 45 is, for example, a general purpose resin to be formed, such as polycarbonate (PC) resin, poly(methylmethacrylate) (PMMA) resin, ABS resin, polystyrene (PS) resin, or polyolefin resin. In a case where transfer, UV (ultraviolet) exposure, or the like is used without using injection molding, it is also possible to cope with resin that requires forming at a high temperature, such as resin for optical applications or super engineering resin. A material of adhesive layer 50 is not particularly limited as long as the material has good adhesiveness with transmissive substrate 45.
Although the present embodiment adopts an aspect in which transmissive region 41 and anti-reflection region 46 each have rectangular shapes in plan view, the cover component of the present embodiment is not limited to the aspect. For example, shapes of transmissive region 41 and anti-reflection region 46 may be a circular shape, and shapes of transmissive region 41 and anti-reflection region 46 may be different from each other. As long as anti-reflection region 46 is formed to cover transmissive region 41 and protrude into colored region 43 over the whole inner peripheral portion of colored region 43, it is possible to achieve the object.
Although the present embodiment adopts an aspect in which fine uneven shape 46a is provided on the surface of anti-reflection region 46 of hard coat layer 42, the cover component of the present embodiment is not limited to the aspect. For example, fine uneven shape 46a may be provided on a back surface of anti-reflection region 46, that is, on decorative layer 48 side, or may also be provided on both the surface and the back surface (both surfaces). In other words, a fine uneven shape may be formed in at least one surface of anti-reflection region 46.
Hard coat layer 42 may not include anti-reflection region 46 and an anti-reflection layer including an anti-reflection region may be separately provided. In other words, although the present embodiment adopts an aspect in which hard coat layer 42 having functions of protecting a display panel and preventing the display panel from being stained, also serves as a role of an anti-reflection layer having a function of anti-reflection, the cover component of the aspect may adopt an aspect in which a hard coat layer and an anti-reflection layer are separately provided.
Base film 51 is a belt-like member, and is made of, for example, polyethylene terephthalate (PET). Since configurations of hard coat layer 42, decorative layer 48, and adhesive layer 50 are the same as the configurations of cover component 1, a detailed description of the same configurations will be omitted. Peelable layer 47 is interposed between base film 51 and hard coat layer 42. Hard coat layer 42 is made to be easily released from base film 51 by peelable layer 47.
Examples of methods for forming each of the layers on base film 51 include vacuum film formation, gravure printing, screen printing, and ink jet printing. In addition, in the present embodiment, in order to favorably form the fine uneven shape, it is preferable that hard coat layer 42 is an after-cure type in which UV (ultraviolet) curing is performed after forming.
Hereinafter, examples of a manufacturing apparatus and a manufacturing method of the cover component of Embodiment 1 will be described with reference to
First, as shown in
Thereafter, poured resin 29 solidifies and forms transmissive substrate 45 as shown in
At this time, fine uneven shape 24 of projection portion 25 is transferred to hard coat layer 42 via base film 51 and peelable layer 47. According to the manufacturing method, it is possible to obtain cover component 1 to which hard coat layer 42 having fine uneven shape 46a, decorative layer 48, and the like are transferred at the same time as forming transmissive substrate 45.
When projecting glass bead 31 having a large diameter such as #60 (average particle diameter of 250 μm) to #80 (average particle diameter of 180 μm) to projection portion 25, first uneven shape 32 having an arithmetic average roughness (Ra) of approximately 1.2 μm, a root mean average roughness (Rms) of approximately 80 nm can be formed on the surface of projection portion 25. Thereafter, when projecting glass bead 34 having a small diameter such as #320 (average particle size of 46 μm) to #600 (average particle size of 24 μm) to projection portion 25, second uneven shape 33 having a root mean average roughness (Rms) of approximately 50 nm can be formed on the surface of first uneven shape 32.
In addition to the sand blasting method using glass beads, it is possible to form a similar fine multistage uneven shape by using etching, electroforming plating, or the like. Examples of a measuring device of such two-step uneven shapes include a laser microscope and a surface roughness measuring machine.
Although cover component 1 of the present embodiment adopts an aspect in which decorative layer 48 having colored region 43 is provided immediately below hard coat layer 42 having anti-reflection region 46, the cover component of the present embodiment is not limited to the aspect. For example, even in an aspect in which decorative layer 48 is provided below transmissive substrate 45, it is possible to achieve the object. In this case, transfer film 53 does not include decorative layer 48, and decorative layer 48 can be formed by forming transmissive substrate 45 by an insert forming method and then printing on transmissive substrate 45.
Hereinafter, cover component of Embodiment 2 will be described with reference to
For example, in a case where the display panel is used in an inside of a vehicle, sunlight or the like is likely to be incident on a top of the display panel and may not easily enter a lower part. In this manner, in a case where the external light incident on the display panel is biased, when reducing the arithmetic average roughness and the root mean average roughness of the fine uneven shape where light is likely to be incident, it is possible to reduce diffusion of external light to prevent white blur in the screen from occurring.
In a case where the external light is likely to be incident on the top of the display panel as in the above example, the arithmetic average roughness (Ra) of fine uneven shape 46b of an upper part may be set to be smaller than the arithmetic average roughness (Ra) of fine uneven shape 46c of the lower part and the root mean average roughness (Rms) of fine uneven shape 46b of the upper part may be set to be smaller than the root mean average roughness (Rms) of fine uneven shape 46c the lower part.
As numerical values of the arithmetic average roughness (Ra) and the root mean average roughness (Rms), for example, in fine uneven shape 46b of the upper part, the arithmetic average roughness (Ra) is more than 0.08 μm and less than 0.15 μm and the root mean average roughness (Rms) is more than 80 nm and less than 150 nm. In fine uneven shape 46c of the lower part, the arithmetic average roughness (Ra) is more than 0.08 μm and less than 0.2 μm and the root mean average roughness (Rms) is more than 80 nm and less than 200 nm.
Although in an aspect shown in
Although the present embodiment adopts an aspect in which two kinds of fine uneven shapes 46b and 46c are provided, the cover component of the present embodiment is not limited to the aspect, and may adopt an aspect in which three or more kinds of the fine uneven shapes each of which has a different arithmetic average roughness (Ra) and a different root mean average roughness (Rms) are provided.
Next, a manufacturing apparatus and a manufacturing method of cover component 2 of the present embodiment will be described with reference to
First, when projecting glass bead 31a having a large diameter of #60 to a portion of projection portion 25 as shown in
Thereafter, when projecting glass bead 31b of #80 to a position where first uneven shape 32a of projection portion 25 is not formed as shown in
When projecting glass bead 34 having a small diameter such as #320 to #600 on a whole projection portion 25 as shown in
That is, Embodiment 1 adopts an aspect in which one kind of first uneven shape 32 is provided on the surface of projection portion 25 as shown in
Cover component 3 of Embodiment 3 includes chromaticity adjustment layer 40 between hard coat layer 42 and decorative layer 48. A thickness of chromaticity adjustment layer 40 is formed to be several μm. Chromaticity adjustment layer 40 contains a very small amount of yellow coloring agent (pigment or dye).
In general, due to deterioration over time of the cover component, the light diffusing in fine uneven shape 46a of the surface of anti-reflection region 46 is more likely to be reflected as the wavelength is shorter. Therefore, light having a short wavelength, such as blue light enters eyes of the viewer. Accordingly, a blue tinge appears. On the other hand, in the present embodiment, since chromaticity adjustment layer 40 containing a yellow coloring agent is provided, even if the blue light is likely to be reflected by the deterioration over time of the cover component, chromaticity adjustment layer 40 supplements the yellow tinge, so that tinges of colors can be canceled each other. Therefore, even if the cover component deteriorates over time in places where irradiation of external light is strong, such as inside the vehicle or mobile device, it is possible to maintain neutral color tone.
In addition, chromaticity adjustment layer 40 preferably contains a UV absorber in addition to the yellow coloring agent. According to the aspect, the UV (ultraviolet) absorber improves the weather resistance of underlying transmissive substrate 45 or the display panel itself, and can prevent a molecular complex of the resin from being attacked by ultraviolet light. Therefore, it is possible to prevent a light absorption band of the resin from being shifted to a longer wavelength side due to deterioration over time and absorbing in a blue region. It is possible to further maintain the neutral color tone.
Although, in
INDUSTRIAL APPLICABILITY
The present disclosure is useful for a cover component that covers a surface of a display panel of an in vehicle display device, a mobile device, or the like.
1, 2, and 3 COVER COMPONENT
21 FIRST DIE
22 SECOND DIE
24, 24a, 24b, 46a, 46b, and 46c FINE UNEVEN SHAPE
27 SUCTION HOLE
28 VACUUM PUMP
32, 32a, 32b, and 46a a FIRST UNEVEN SHAPE
33 and 46a b SECOND UNEVEN SHAPE
40 CHROMATICITY ADJUSTMENT LAYER
41 TRANSMISSIVE REGION
42 HARD COAT LAYER (ANTI-REFLECTION LAYER)
43 COLORED REGION
45 TRANSMISSIVE SUBSTRATE
46 ANTI-REFLECTION REGION
47 PEELABLE LAYER
48 DECORATIVE LAYER
50 ADHESIVE LAYER
51 BASE FILM
53 and 53a TRANSFER FILM
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-098347 | May 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/014054 | 4/4/2017 | WO | 00 |
