JP3470827B2 - Display panel and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel having a hairline pattern formed on its surface and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, screen printing has been used for printing characters and the like on meter display panels used in automobiles, where the operating environment is severe due to heat and vibration. Since this screen printing can increase the thickness of printing ink, it is widely used as a display panel for a transmission color meter or the like, which has an image concealing property in which the light source is not visible even when it is turned on from the back surface of the display panel. Further, as an example of this screen printing, there is a method of applying a screen similar to a fine scratch pattern formed by a hairline finish, which is a kind of aluminum surface treatment (hereinafter referred to as "hairline shape"), to the display panel surface by screen printing. The manufacturing process is shown in FIG.

FIG. 10 (b) shows the transparent white ink layer 2 printed on the entire surface of the substrate 1 shown in FIG. 10 (a). After the transparent white ink layer 2 is printed, the black ink layers 3 and 4 are sequentially printed to express a pattern such as a scale.
It is (c) and FIG.10 (d). Further, FIG. 10 (e)
As shown in FIG. 5, the line-shaped ink layer 5 colored in gray metallic color or the like is printed as thin as possible to form a hairline-shaped pattern.

[0004]

However, as shown in FIG.
When a hairline-like pattern is formed on the display board by this screen printing, the minimum value of the width of each line and the space between the lines constituting the hairline are about 0.2 mm and 0.3 mm, respectively. If it is thinner than this, blurring of lines and crushing of adjacent lines occur, and there is a problem that the fineness required for expressing a hairline pattern is not satisfied.

In addition, as shown in FIG. 10 (e), the screen-printed hairline pattern is formed by the black ink layer 4 and the line-shaped ink layer 5 in a concavo-convex pattern, so that the concavo-convex pattern remains as it is. Therefore, there is a problem that it is not possible to express the peculiar appearance of a hairline pattern in which light is reflected in a fine metallic scratch pattern.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a display panel having a fine metallic scratch pattern unique to a hairline finish on its surface and a method for manufacturing the same. .

[0007]

In order to solve the above-mentioned problems, a display board according to the present invention according to claim 1 is a substrate and a single unit provided with a hairline-shaped uneven portion on the surface of the substrate. A hairline layer formed as one layer, the hairline layer being transparent and the substrate being
It has a print display layer on the alignment layer side,
At least part of the ink is
It is characterized in that it is formed . The display panel according to claim 2 of the present invention is provided with a substrate and the substrate.
As a single layer with hairline-shaped irregularities formed on the surface
And a hairline layer formed by:
Is transparent, and the substrate has a metal surface on the hairline layer side.
It is characterized by having .

[0008]

The display board according to claim 3 of the present invention is the display board according to claim 1 or 2 , wherein the hairline layer is made of a photocurable material.

According to a fourth aspect of the present invention, in the display panel according to any one of the first to third aspects, the hairline layer is partially formed on the substrate. Characterize. A display board according to claim 5 of the present invention is the display board according to any one of claims 1 to 4, which is a dial for an instrument.

According to a sixth aspect of the present invention, in the method for producing a display board, a film is formed by coating a photocurable resin on the side of the film-shaped support on which the hairline-shaped uneven portion is formed, on the uneven portion forming side. A film forming step, a laminating step of laminating the photocurable resin side of the film on a substrate, a curing step of curing the photocurable resin, and a peeling step of peeling the film-shaped support from the film. , Are included.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a display panel according to the sixth aspect , wherein the photocurable resin is replaced with a curing step of curing the photocurable resin. Is partially cured, and a removal step of removing an uncured portion of the photocurable resin is performed as a step subsequent to the peeling step.

The method of manufacturing a display board according to claim 8 of the present invention is the method of manufacturing a display board according to claim 7 , wherein in the partial curing step, a mask pattern is arranged on the film. It is characterized in that light is irradiated from the support side. The method for manufacturing a display panel according to claim 9 according to the present invention is the method for manufacturing a display panel according to any one of claims 6 to 8 , before the film forming step or the laminating step. The method is characterized by including a print display layer forming step of forming a print display layer on the substrate.

[0014]

According to the display board of claim 1, the hairline layer formed as a single layer on which the hairline-shaped irregularities are formed is provided on the substrate,
There is an effect that a fine scratch pattern peculiar to the hairline finish, which cannot be expressed by screen printing, can be expressed on the surface of the display board.

Further, since the hairline layer is transparent, it has the effect of allowing the viewer to visually recognize the color of the substrate surface on which the hairline layer is provided. Further, since the substrate has the print display layer, there is an effect that a hairline pattern can be expressed in any color or image. It
In addition, since the printed display layer of the substrate is formed of the ink containing the metallic pigment, there is an effect that a metallic hairline pattern colored in a predetermined color can be expressed.

According to the display board of the second aspect, since the substrate has a metal surface on the hairline layer side, there is an effect that a hairline-like pattern peculiar to the metal color can be expressed. According to the display board of the third aspect , since the hairline layer is made of a photocurable material, when a heat softening material is used for the substrate, there is an effect that thermal deformation of the substrate can be suppressed.

According to the display board of claim 4 , since the position for forming the hairline layer can be arbitrarily selected,
There is an effect that it is possible to express a hairline-shaped pattern except for a portion where the hairline-shaped pattern need not be applied. According to the display panel of claim 5 , by laminating the hairline layer on the surface of the instrument dial, a hairline pattern can be expressed on the surface of the instrument dial, and the visual observation of the instrument dial is possible. It has the effect of giving a beauty to the person.

According to the method for manufacturing a display board according to claim 6 or 7 , since the hairline-shaped irregularities are formed on the film by using the film-shaped support, the individual hairlines constituting the support are formed. By changing the line width and the line interval, it is possible to easily change the fineness of the hairline pattern formed on the film. Moreover, since the hairline is formed on the film by using the support, the hairline formed on the support can be faithfully reproduced, and the mass productivity is improved. Furthermore, since the film is made of a photocurable resin, when a heat softening material is used for the substrate, there is an effect that thermal deformation of the substrate can be suppressed.

According to the method of manufacturing a display board according to claim 7 or 8, since the portion where the film is cured can be arbitrarily selected and the uncured film can be removed, the portion where the hairline pattern is not applied can be easily increased. There is an effect that it can be formed with high precision. According to the manufacturing method of the display board of claim 9 , since the print display layer is formed, there is an effect that a hairline pattern can be expressed in any color or image.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 7 show a first embodiment in which the display panel of the present invention and its manufacturing method are applied to an engine speed display panel for an automobile.

As shown in FIG. 1, the engine speed display panel 10 includes a substrate 11 made of polycarbonate resin, for example.
And a photosensitive layer 30 covering the printed display layer 20 and the printed display layer 20 formed on the substrate 11. The print display layer 20 includes a transparent white ink layer 21 and a black ink layer 22.
And a metallic ink layer 23. The transparent white ink layer 21 is formed on the entire surface of the substrate 11, and a black ink layer 22 expressing a pattern such as an engine speed scale is formed on the transparent white ink layer 21. The metallic ink layer 23 is made of printing ink mixed with metallic pigment such as aluminum powder, and is formed on the black ink layer 22.

The photosensitive layer 30 is colorless and transparent and is made of, for example, an ultraviolet curable material which is a mixture of an acrylic polymer, a photosensitive acrylate, a photopolymerization initiator and the like.
It is formed with a thickness of μm and covers the surface of the print display layer 20 and is in close contact with it. The surface of the photosensitive layer 30 has triangular irregularities 3
0a are continuously formed, and the uneven portion 30a forms a hairline. The distance from the bottom to the apex of the triangular uneven portion 30a, which is the depth of the hairline, is 1 μm to
2 μm, and the width of the hairline is 0.1 μm to 10 μm
μm.

Next, a method of manufacturing the engine speed display panel 10 will be described with reference to FIGS. The method for manufacturing the engine speed display panel 10 includes (1) a print display layer forming step,
(2) Photosensitive layer forming step, (3) Laminating step, (4)
It is divided into a photosensitive layer curing step and (5) support peeling step.
Here, (2) the photosensitive layer forming step corresponds to the film forming step, (3) the laminating step corresponds to the laminating step,
The (4) photosensitive layer curing step corresponds to the curing step, and the (5) support peeling step corresponds to the peeling step. Hereinafter, each step will be sequentially described.

(1) Printed / displayed layer forming step The steps of forming the printed / displayed layer 20 are shown in FIGS.
Shown in (c) and (d). As shown in FIG. 2 (b),
A transparent white ink layer 21 is printed on the entire surface by screen printing on the upper surface of the substrate 11 shown in FIG. Figure 2
As shown in (c), the black ink layer 22 expressing the scale of the number of revolutions is printed on the transparent white ink layer 21.
Further, as shown in FIG. 2 (d), a metallic ink layer 23 for producing a metallic luster is printed on the black ink layer 22,
The process of forming the print display layer 20 is completed.

(2) Photosensitive layer forming step A transparent support 32 having a thickness of 38 μm and made of, for example, a polyester film having a hairline formed on its surface in advance.
As a mold, the surface of the support 32 is uniformly coated with a liquid ultraviolet curing material. After that, the UV curable material is thermally dried to remove the solvent contained in the UV curable material to remove the fluidity of the UV curable material, and the process of forming the photosensitive layer 30 shown in FIG. 3 is completed. The surface 30b of the heat-dried photosensitive layer 30 has viscosity, and this viscosity is used in the next step.

(3) Laminating Step As shown in FIG. 4, the photosensitive layer 30 formed in the previous step (2) is formed on the surface of the printed display layer 20 formed in the previous step (1) together with the support 32 by Hitachi Chemical. It is laminated with a dry film laminator 40 manufactured by. At this time, since the surface of the photosensitive layer 30 is viscous, the surface of the photosensitive layer 30 is laminated toward the surface side of the print display layer 20. Therefore, the photosensitive layer 30 is not peeled off from the print display layer 20 after the lamination. .

(4) Photosensitive Layer Curing Step As shown in FIG. 5, the entire surface is irradiated with ultraviolet rays 43 from the support 32 side by an ultraviolet ray irradiator (not shown) manufactured by Oak Manufacturing. As a result, the photosensitive layer 30 is exposed and cured. By this curing, the photosensitive layer 30 is adhered to the print display layer 20. (5) Support Stripping Step As shown in FIG. 6, the support 32 is stripped from the photosensitive layer 30 to complete the entire step.

Through the steps (1) to (5) above, the engine speed display panel 10 for an automobile shown in FIG. 7 is obtained.
The photosensitive layer 30 is provided on the surface of the engine speed display panel 10.
Since the fine uneven portion 30a is formed by
The light and dark formed by the uneven portions 30a form a hairline pattern. The width of each line and the interval between the lines forming the hairline pattern are determined by the width of the irregularities formed on the support 32 and the interval between the irregularities, and can be easily changed.

In the step (2), the support 32 is previously prepared.
It has also been confirmed that by applying a release agent made of, for example, silicone to the surface, the work of peeling the photosensitive layer 30 from the support 32 can be facilitated in the step (5). First
According to the embodiment, by forming the photosensitive layer 30 on which the hairline-shaped pattern is formed on the print display layer 20, it is possible to express a fine metallic scratch pattern unique to the hairline finish, which cannot be expressed by screen printing. effective.

Further, according to the first embodiment, since the support 32 used as a mold is used, this support 32 is used.
It is possible to easily change the fineness and the like of the hairline-shaped pattern of the photosensitive layer 30 formed by the support 32 by changing the widths of the individual lines forming the hairline formed in the above and the intervals between the lines. There is an effect that can be done. Further, since the hairline is formed by using the support 32 used as a mold, the hairline formed on the support 32 can be faithfully reproduced and mass production is improved.

In the embodiment of the present invention described above, the photosensitive layer 30 made of an ultraviolet curable material which is cured by irradiation with ultraviolet rays.
However, the present invention is not limited to this, and it is possible to form the photosensitive layer with a photo-curable material using light having a wavelength other than ultraviolet rays or other wavelengths including ultraviolet rays. In the present invention, a thermosetting resin such as an acrylic resin or an epoxy resin may be used instead of the photosensitive layer.

Further, in the first embodiment, the photosensitive layer 30 made of a colorless and transparent UV curable material is used for visually recognizing the colored color in the print display layer 20, but the present invention is not limited to this. For example, the photosensitive layer may be formed by coloring the ultraviolet curable material with a transparent pigment. Further, in the first embodiment, the photosensitive layer 30 is formed on the printed display layer 20, but the present invention is not limited to this. For example, a metallic pigment containing aluminum powder or the like is mixed with an ultraviolet curable material to form a substrate. It may be directly formed on. In the present invention, it is also possible to directly form the photosensitive layer on the surface of the metal layer such as aluminum.

(Second Embodiment) FIGS. 8 and 9 show a second embodiment in which the display panel of the present invention and the manufacturing method thereof are applied to an engine speed display panel for an automobile. The same reference numerals are given to substantially the same components as those in the first embodiment. As shown in FIG. 8, the engine speed display board 50 according to the second embodiment,
This is different from the first embodiment in that the photosensitive layer 30 is not formed on the entire surface of the print display layer 20, but an arbitrary portion is selected to form the photosensitive layer 30.

The photosensitive layer 30 has the following 6 (1) to (6).
Consists of steps. However, since the steps (1) to (3) are the same as the steps (1) to (3) of the first embodiment, the description thereof will be omitted.
(4) photosensitive layer partial curing step, (5) support peeling step,
(6) The uncured portion removing step will be described. here,
(4) The photosensitive layer partial curing step corresponds to the partial curing step,
The (5) support peeling step corresponds to the peeling step, and the (6) uncured portion removing step corresponds to the removing step.

(4) Step of partially curing the photosensitive layer As shown in FIG. 9, by laminating the mask film 51 on the support 32 laminated in the previous step (3),
The negative mask pattern 52 formed on the mask film 51 covers a portion where the photosensitive layer 30 is not formed. Since the photosensitive layer 30 is not formed in the portion excluding the black ink layer 22 and the metallic ink layer 23, which represent the scale of the number of rotations, etc., it is covered with the negative mask pattern 52. As a result, even if the ultraviolet ray 43 is entirely irradiated from the mask film 51 side by an ultraviolet ray irradiator (not shown) manufactured by Oak Manufacturing Co., Ltd., the portion not forming the photosensitive layer 30 is shielded from the ultraviolet ray 43 by the negative mask pattern 52 and is not irradiated. The photosensitive layer 30 is not cured. The photosensitive layer 3 in the portion where the ultraviolet ray 43 is not shielded by the negative mask pattern 52
0 cures.

(5) Support peeling step Support 32 together with mask film 51 from photosensitive layer 30
Peel off. (6) Uncured portion removal step Since the unexposed portion in the previous step (4) remains without being cured, the uncured portion is removed by etching the uncured portion with a predetermined alkaline developer. This completes the entire process. As shown in FIG. 8, a black ink layer 22 and a metallic ink layer 23 that express the scale of rotation speed and the like.
The photosensitive layer 30 is formed on the portion.

According to the second embodiment, the mask film 51 having the negative mask pattern 52 is laminated on the support 32 which supports the photosensitive layer 30 to selectively and easily form the highly accurate photosensitive layer 30. There is an effect that can be done. In addition, according to the second embodiment, since the photosensitive layer 30 is formed with high accuracy by using the mask film 51, it is possible to efficiently print characters, scales, etc. without requiring the pattern escape required in the conventional screen printing. There is an effect that can be placed.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view taken along line II of FIG. 7 showing an engine speed display panel according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a manufacturing process of a printed display layer of the engine speed display panel according to the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a process of forming a photosensitive layer of an engine speed display panel according to the first embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing a laminating process of the engine speed display panel according to the first embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a photosensitive layer curing step of the engine speed display panel according to the first embodiment of the present invention.

FIG. 6 is a schematic perspective view showing a support peeling process of the engine speed display panel according to the first embodiment of the present invention.

FIG. 7 is a schematic front view showing an engine speed display panel for an automobile according to the first embodiment of the present invention.

FIG. 8 is a schematic sectional view of an engine speed display panel according to a second embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view showing a process of partially curing the photosensitive layer of the engine speed display panel according to the second embodiment of the present invention.

FIG. 10 is a schematic perspective view showing a manufacturing process of a conventional display panel.

[Explanation of symbols]

10, 50 Engine speed display panel (display panel) 11 Substrate 20 Printed display layer 21 Transparent white ink layer 22 Black ink layer 23 Metallic ink layer 30 Photosensitive layer (hairline layer) 32 Support (Film-like support) 51 Mask Film 52 Negative mask pattern (mask pattern)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01D 13/02 G04B 19/06

Claims (9)

(57) [Claims] 1. A substrate, and a hairline layer formed on the substrate as a single layer having a hairline-shaped uneven portion formed on the surface thereof. The hairline layer is transparent, and the substrate is Haira
It has a printed display layer on the in-layer side, and the printed display layer is less
Both parts are formed by ink containing metallic pigment.
A display panel characterized by being made . 2. A substrate and a surface provided on the substrate,
Formed as a single layer with aligned irregularities
The hairline layer is transparent, and the substrate is transparent.
A display panel having a metal surface on the inner layer side . Wherein the hair line layer according to claim 1 or 2 display panel according to, characterized in that consisting of the photocurable material. Wherein said hair line layer from claim 1, wherein the partially formed on the substrate 3 Noise
The display panel described in item 1 . 5. The display board according to claim 1 , wherein the display board is an instrument dial. 6. A film forming step of forming a film obtained by coating a photocurable resin on the side of the film-shaped support on which the hairline-shaped irregularities are formed, and the photocurability of the film. A method of manufacturing a display panel, comprising: a laminating step of laminating a resin side on a substrate; a curing step of curing the photocurable resin; and a peeling step of peeling the film-shaped support from the film. . 7. The display panel manufacturing method according to claim 6 , further comprising a partial curing step of partially curing the photocurable resin, instead of the curing step of curing the photocurable resin. A method of manufacturing a display panel, comprising a removal step of removing an uncured portion of the photocurable resin as a step subsequent to the step. 8. The method of manufacturing a display panel according to claim 7 , wherein in the partial curing step, a mask pattern is arranged on the film, and light is irradiated from the film support side. 9. claim 6, characterized in that it comprises a printed display layer forming step of forming a printed display layer on the substrate as a pre-process of the film formation step or the laminating step
9. The method for manufacturing a display panel according to any one of items 8 .