JP2002040952A - Display plate and electronic display appliance equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display plate showing metallic appearance and a sharp color image. SOLUTION: A metal film 3 having a large number of small holes 3a with about 5 to 70 μm pore diameter in a specified pitch by about 20 to 50% area rate of the view area is formed on the upper face side of a transparent substrate 2, a color image forming layer 4 (accepting layer 4a) having a color image 4b formed from subliming dyes is formed on the upper face side of the metal film 3, and further, a transparent protective film layer 5 is formed on the upper face of the color image forming layer 4. A UV absorbent is dispersed in either the color image forming layer 4 or the transparent protective film layer 5. Patterns such as satin finish, radial lines, stripes, lattice, geometric pattern or the like are formed on the metal film 3. A silver metal film is applied on the metal film 3 or a white coating film is applied. The display plate has light resistance, decorating property, sophisticated taste and noble metal appearance. The display plate 1 for a watch is equipped with a solar cell 7 (or back light) in the lower face side as a portable watch. This display plate can be used for an electronic display appliance such as a mobile phone with a back light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel such as a clock having a solar cell or a backlight, a display panel of a portable telephone or various instruments having a backlight, and an electronic display device having the same.

[0002]

2. Description of the Related Art In recent years, portable information processing apparatuses and the like which have been reduced in size have been used. In this type of device, as an electronic display device, there is a device in which an EL is provided on a watch to emit light when it is dark to illuminate the display panel of the watch, or a device in which a solar cell is incorporated to drive the watch. In addition, in various instrument panels of mobile phones, automobiles, and the like, there is a type in which a backlight such as an EL or an LED is provided to emit light when dark to illuminate a display.

The display panel provided with the EL and the solar panel provided with a solar cell often use a plastic plate, a glass plate, or the like because light transmittance is required. Various methods have been adopted to decorate this plastic plate or glass plate to give it a decorative variation or a high-grade appearance. However, the display plate has a poor metallic appearance and lacks a high-quality appearance.

As a method of solving this method, the technique is disclosed in Japanese Patent Application Laid-Open No. H11-326549, entitled "Timepiece dial", which was previously filed and published by the present applicant.

According to the above-mentioned Japanese Patent Application Laid-Open No. H11-326549, "Timepiece dial", as shown in FIG. 6, the structure of the timepiece display plate 21 is the upper surface side of the transparent base 22 made of a transparent resin plate or the like. Small holes that cannot be recognized by many eyes
A metal film 23 on which 3a was formed was provided, and indices 24 such as a time character and a mark were provided at predetermined positions. The upper surface is coated with a clear coating film 25 to prevent corrosion and damage of the metal film 23. The solar cell 26 (or EL) is arranged below the timepiece display panel 21.

The metal film 23 has a two-layer structure (the upper layer is made of silver metal and the lower layer is made of nickel metal).
The small holes 23 a of 0 μm are uniformly distributed at an area ratio of about 20 to 50% of the entire surface area of the metal film 23.
3a is formed with high precision by a manufacturing method using an electrohoming method.

A brief description will be given of a manufacturing method using the above-described electrohoming method. FIG. 7 is a process chart showing a method for manufacturing a metal film. First, a resist film 31 is formed by printing on a smooth stainless steel plate 30 in FIG. In FIG. 7B, the resist film 31 is exposed by a photographic exposure device, and a portion other than the position of the desired small hole 23a, that is, a stripping removal portion 31a is removed by a resist stripping device. FIG.
In (c), a release agent 32 is applied to the resist film peeling and removing portion 31a. In FIG. 7D, a nickel plating 33 is applied on the release agent 32 by a plating apparatus. In FIG. 7E, a silver plating 34 is further applied on the nickel plating 33. In FIG. 7F, the resist film 31 at the small holes 23a is removed by a resist peeling device. In FIG. 7G, the metal film (two layers) 23 is peeled off from the stayless plate 30.

When the metal film is manufactured by the electrohoming method described above, the thickness of the metal film
When a thick film having a thickness of 30 μm or more is formed, it is difficult to control the size of the small holes for the following reason.

FIG. 8 is a sectional view of a main part of a portion where the resist film is removed when the resist film is thick. In FIG. 8, after forming a resist film 31 on a smooth stainless steel plate 30 by printing, the resist film 31 is exposed by a photographic exposure device, and a portion other than a desired small hole formation, that is, a stripping removal portion 31a is formed by a resist stripping device. Figure 7 shows the state after removal (corresponding to Figure 7b). If the resist film 31 is made thicker, a stripping side surface perpendicular to a straight line cannot be obtained when the resist film 31 is exposed and stripped, and the stripping side surface is inevitably inclined, and the hole diameter cannot be accurately measured.

FIG. 9 is a sectional view of a main part of a portion where the resist film is removed when the resist film is thin. In FIG. 9, a resist film 31 is usually formed in a thickness range of about 10 to 20 μm. When the metal film is formed within this thickness range, the stripped and removed portion 31a of the resist film 31 can be formed with high precision without inclination.

FIG. 10 is a sectional view (corresponding to FIG. 7e) of an essential part in which silver plating is further applied on nickel plating by electrohoming, and FIG. 11 shows a metal film (two layers).
7 is a cross-sectional view of a main part in a state in which is peeled from a stainless steel plate (FIG.
).

In FIG. 10, reference numeral 30 denotes a stainless steel plate;
1 is a resist film, 32 is a release agent, 33 is a nickel plating layer, and 34 is a silver plating layer. When the resist film 31 is made thicker, when exposed and peeled, a peeled side surface perpendicular to a straight line cannot be obtained as described above, and it becomes an inclined peeled side surface, so that accurate dimensions cannot be obtained. Since the resist film 31 cannot be made thick, the resist film 31 is usually used.
Is formed in a thickness range of 10 to 20 μm.
When the metal film 23 is formed below the thickness range, the hole diameter d1 of the small hole 23a can be formed with high precision.

However, the metal film 23 has
In order to form an uneven pattern such as a stripe shape, a lattice shape, a geometric shape, or the like, at least the thickness t2 of the metal layer 23 ≒ 30 μm or more is required. As shown in FIG. 10, when plating is formed to be thicker than the thickness t1 of the resist film 31, the metal film 23 is formed.
Since the thickness t2 is large, plating is formed on the side of the resist film 31 so as to form a plated portion 35.

Therefore, as shown in FIG. 11, when the resist film 31 is peeled off and the metal film (two layers) 23 is peeled off from the stainless steel plate, the plating protrusion 35 is formed inside the small hole 23a.
Therefore, the hole diameter d1 of the small hole 23a is reduced accordingly. When the small holes 23a become extremely small, it may appear that the plated protrusions 35 are connected and the small holes 23a are not formed. In particular, when the small holes 23a are small, it becomes difficult to manage the dimensions thereof. As shown in FIG. 6, in the case of the timepiece display panel 21, the small holes 23 a are provided with the metal film 23 on the upper surface of the transparent base 22.
The pore size cannot be increased.

When the above-mentioned metal film is used for an analog timepiece display panel, an external appearance function is required, and decorativeness by pattern formation is also required. Therefore, a metal film having a predetermined thickness of, for example, 30 μm or more is absolutely necessary. It is said. In addition, the electrohoming method requires a long manufacturing process and is expensive.

Further, the above-mentioned Japanese Patent Application Laid-Open No. 11-326549
In Japanese Patent Application Laid-Open Publication No. H11-157, there is disclosed a configuration in which a color coating film made of a pigment is provided on the upper surface of a metal film having such small holes. FIG. 12 is a cross-sectional view of a main part of a timepiece display panel in which a color coating layer is provided on the upper surface of a metal film.

In FIG. 12, a timepiece display plate 41 is provided with a metal film 43 having a large number of small holes 43a which cannot be visually recognized.
On the upper surface of No. 3, a concavo-convex pattern 43b having a satin shape, a shining light shape, a stripe shape, a lattice shape, a geometric shape, etc. was formed. The transparent color coating layer 44 is provided on the upper surface, and an index 45 such as a time character and a mark is provided at a predetermined position.

The color coating layer 44 is provided in order to add various color tones to the metal color of the metal film 43 so as to bring out decorativeness and color variations. By providing a color coating film that forms a multicolor pattern, decorativeness and color variations could be enriched. The color coating layer 44 has a light transmitting property, and the emitted light of the EL 46 transmits through the color coating layer 44 to irradiate the dial surface, or alternatively, the external light transmits and the solar cell It was configured to be incident on. The color coating film 44 is formed by dispersing and blending a color pigment in a transparent resin to form a coating and uniformly forming the coating by screen printing or the like.

[0019]

However, when a metal film is formed by the above-described electrohoming method,
Due to the relationship between the diameter of the small holes formed in the metal film and the thickness of the metal film, it is difficult to control the size of the small holes when the metal film is thick. Also, the electrohoming method requires a long manufacturing process,
There were problems such as high cost.

In a timepiece display panel provided with a color coating layer on the upper surface of a metal film and a backlight (or a solar cell) on the lower surface of the display panel, the transmittance of the color coating layer also has an effect. Therefore, the color coating layer cannot be made deeper in color because the color coating layer is color-decorated using a pigment, and the color coating layer is rather a pale color tone. Therefore, the appearance of a metal film that can easily control the size of the small holes, reduce the manufacturing cost, and has a decorative property, a high-grade appearance, and the like has become a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the purpose of providing a vivid color decoration as a display panel with a large amount of external light transmitted and a large amount of transmitted light from a backlight. The present invention provides an inexpensive display panel having an abundance of metal, high-grade appearance, a simple manufacturing process, a reduced number of steps, and a low cost, and an electronic display device having the same.

[0022]

In order to achieve the above-mentioned object, a display panel according to the present invention comprises a transparent substrate and a small hole provided on the upper surface side of the transparent substrate and having a hole diameter of about 5 to 70 μm. A plurality of metal films formed at regular intervals at an area ratio of about 20 to 50%, a color image forming layer provided on the upper surface side of the metal film and having a color image formed of a sublimable dye, A transparent protective film layer formed on the upper surface of the formation layer.

Also, a transparent substrate and a plurality of metal films formed at regular intervals at an area ratio of approximately 20 to 50% of a cut-off area of small holes having a hole diameter of approximately 5 to 70 μm provided on the lower surface side of the transparent substrate. And a color image forming layer provided on the upper surface side of the transparent substrate and having a color image formed with a sublimable dye, and a transparent protective film layer formed on the upper surface of the color image forming layer. Things.

Further, the color image forming layer has a smooth surface.

Further, at least one of the color image forming layer and the transparent protective film layer may be provided with 2- (3,5-di-t-butyl-2-human peroxyphenyl) benzotriazole or 2- (3-t-butyl). -5-Methyl-2-human peroxyphenyl) -5-chlorobenzotriazole or ultrafine zinc oxide in which at least one ultraviolet absorber is dispersed.

Further, the metal film is characterized in that an uneven pattern such as a satin pattern, a shining pattern, a stripe pattern, a grid pattern, a geometric pattern, etc. is formed on the upper surface.

Further, the invention is characterized in that the metal film is provided with a silver metal film.

Further, the present invention is characterized in that a white paint film is provided on the upper surface of the metal film.

Further, in an electronic display device provided with a solar cell or a backlight, the display panel is provided on an upper surface side of the solar cell or the backlight.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display panel according to the present invention will be described with reference to the drawings. 1 to 3 show a display panel according to a first embodiment of the present invention. FIG. 1 is a sectional view of a main part of a solar cell dial structure, FIG. 2 is a partially enlarged sectional view thereof, and FIG. FIG. 2 is a partially enlarged plan view of the metal film of FIG.

In FIGS. 1 and 2, the timepiece display panel 1 is
The metal film 3 is provided on the upper surface side of the transparent substrate 2. In this embodiment, the metal film 3 is a metal film formed by performing silver deposition by an electrohoming method, and has a thickness of about 1 μm and does not transmit light. A large number of small holes 3a of about 20 μm are formed at equal intervals in the metal film 3, and the area of the small holes 3a is formed in a range of about 30% of the area that the display panel can see (partition area). Things.

In FIG. 3, the shape of the small hole 3a provided in the metal film 3 is formed as a round hole. However, the shape is not limited to the round hole, and an elongated round hole, a square, a rectangle, or the like can be freely selected. .

A color image forming layer 4 having a color image 4b formed with a sublimable dye on the upper surface side of the metal film 3.
Is arranged. Further, a transparent protective film layer 5 is provided on the upper surface side of the color image forming layer 4, and an index 6 such as a time character is arranged at a predetermined position of the transparent protective film layer 5. Further, a solar cell 7 (or a backlight) is provided on the lower surface side of the timepiece display panel 1.

Here, the metal film 3 is formed as follows. a. Silver vapor deposition is applied to the entire surface of a transparent thin glass plate. b. A resist film is formed on the deposition surface by printing or painting. c. Using a negative film or a positive film, exposure is performed by irradiating ultraviolet rays to remove a portion of the resist film corresponding to the small holes. d. Next, a portion of the deposited film corresponding to the small hole is peeled off with an etchant. e. Next, the remaining resist film is stripped. As a result, the metal film 3 having the silver deposited film formed on the portions other than the small holes is obtained.

The color image forming layer 4 is obtained by transferring a color image 4b formed with a sublimable dye onto transfer paper to a receiving layer 4a formed by printing or painting with a transparent polyurethane resin or the like. is there. The receiving layer 4a is formed on the upper surface on which the metal film 3 is formed by printing, coating, or the like with a paint formed by mixing a curing agent, an ultraviolet absorber described below, a solvent, etc., with a polyurethane resin or the like as a main component. It is formed in a range of approximately 20 to 50 μm.

In the present embodiment, the receiving layer 4a has
About 2.5 parts by weight of an ultraviolet absorber (3,5-di-t-butyl-2-human peroxyphenyl) benzotriazole is mixed with 100 parts by weight of the polyurethane resin. When an ultraviolet absorbent is contained, the light fastness of the sublimable dye can be improved. As the ultraviolet absorber, other than the above, 2- (3-t
-Butyl-5-methyl-2-human peroxyphenyl) -5-chlorobenzotriazole and ultrafine zinc oxide are effective.

The upper surface of the receiving layer 4a is polished to a smooth surface so that the color image of the transfer paper can be clearly transferred, and the smoothed receiving layer 4a is finished.
A transfer paper, which will be described later, is placed on the upper surface of the sheet, and is pressed at about 180 ° C. under a pressure of 10 g / cm 2 for about 1 minute to transfer the color image 4b of the transfer paper to the smooth surface of the receiving layer 4a. In this manner, the vaporized dye seeps into the receiving layer 4a of the timepiece display panel 1, and the desired color image 4
b is transferred.

Printing of a color image on transfer paper with a sublimable dye ink is performed by an ink jet printer or the like.
The printing on the transfer paper has a dot size of about 1440 dpi, and if it is printed on the transfer paper, the print don't be almost invisible to the naked eye and a beautiful color image is formed. The color image printing in the present embodiment uses, for example, two colors of sublimable dye inks of red and yellow, and the printing area of the yellow dot is approximately 8%, the printing area of the red dot is approximately 2%, and the remaining 90%. The% is printed in a state where yellow dot printing and red dot printing are uniformly dispersed so as not to overlap, so that the ratio becomes the ratio of the white background area.

Since the transfer is performed from the transfer paper formed in this manner under a predetermined pressure, the sublimable dye formed in the form of dots penetrates into the receiving layer by the pressure, and after the transfer, the adjacent dots of the adjacent dots are transferred. In some cases, the dye does not mix well, and a dot-like trace may appear even after transfer. Although it is not visible to the naked eye, it can be seen as spots when enlarged and viewed. For example, when arranging a small number of red print dots in a large number of yellow print dots to produce a light orange color, it is not noticeable to the naked eye, but when viewed in a slightly enlarged state, the red transfer part is a red spot. It is confirmed as. This phenomenon was not eliminated because there was no significant change even if the heating temperature and the pressure were adjusted in various ways.

In order to eliminate this phenomenon, the receiving layer 4a of the timepiece display panel 1 is again pressed without pressure at a predetermined temperature, for example, at about 180 ° C. for about 30 seconds to 3 minutes.
The whole is heated uniformly. The heating may be performed, for example, by placing the display panel on a flat hot plate and heating the receiving layer 4a substantially uniformly at the same time. Alternatively, the display plate may be placed on a flat, mesh-shaped stage, and may be uniformly irradiated with infrared rays.

By this reheating, the dye penetrates into a dot shape, and the dye mixes with the dye of the adjacent horizontal dot to eliminate the speckles. Is obtained. This occurs not only in the case of a light mixed color but also in the case of a dark mixed color, so that the dyes are well mixed as a whole and a beautiful uniform color tone can be obtained.

Further, it is heated again to cure the receiving layer 4a. This is because the resin is cured so that the sublimable dye is caused to flow by heat and does not escape outside.
The heating is performed at about 100 ° C. for about 30 minutes. It is preferable to cure at a low temperature as long as possible. Heating at a high temperature is not preferable because the dye flows and escapes outside. After curing as described above, the surface of the receiving layer 4a is polished again in order to further remove indentations due to pressurization during transfer.

The color image 4 transferred to the receiving layer 4a
b is a color image of a single color, a color image formed like a painting or a photographic image in which various colors are mixed, a color image including characters and the like in these color images, and all color images such as included.

The transparent protective film layer 5 provided on the upper surface of the color image forming layer 4 comprises a transparent resin binder, a curing agent,
Printing, painting, etc. with a paint containing an ultraviolet absorber 3
It is formed to a thickness of 0 to 50 μm. This transparent protective film layer 5
It is preferable to use a material which cures naturally at room temperature, instead of being heated and forcibly cured. This is because, in the case of the heat-curable type, even if the pre-receiving layer 4a is cured, the dye slightly flows, and may enter the transparent protective film layer 5 or escape to the outside. When it enters the transparent protective film layer 5, there arises a problem that a color image is disturbed or an image which is deeply sunk cannot be obtained. Further, when the upper surface of the transparent protective film layer 5 is polished, a very beautiful finish can be obtained with a glossy appearance. The transparent protective film layer 5 is provided to protect the color image forming layer 4 from scratches and the like. However, the presence of the transparent protective film layer 5 causes the color image 4b underneath to have a depth with sinking. Appears.

In this embodiment, the transparent substrate 2 is made of glass. However, it is also possible to use a resin plate or a thick film which has very small expansion and contraction and is resistant to heat.

In the present embodiment, the area ratio of the small holes 3a is formed at 30%. However, when the backlight 7 is used, if it is 30%, the light is illuminated considerably brightly, and the display panel at the time of darkness is illuminated. There is no problem in the visual recognition of. In the case where the backlight 7 is used, if there is an area ratio of 20% or more, it is within a range where there is substantially no problem in visual recognition.

Operation of the timepiece display plate having the above-described structure
The effect will be described. Since the metal film 3 is provided on the lower surface side of the color image forming layer 4, the small holes 3a formed in the metal film 3 are formed to have a diameter of 70 μm or less. And is not visible.

Further, since the small holes 3a are formed at a constant interval of 50% or less of the parting area (the area where the display panel can be seen), the area of the metal part is increased, and the entire surface appears to be made of metal. . When the area of the metal part becomes 50% or more, the metal surface becomes invisible and large holes appear to be formed.

Here, the lower limit of the area ratio is slightly different between the case where the solar cell 7 is used and the case where the backlight is used. In the case of the solar cell 7, since the power generation amount is affected, the lower limit of the area ratio is about 35%. In the case of a backlight, it affects the degree of brightness of the illumination.
% Is within the visible range.

When used for the solar cell 7, the small holes 3
There is a relationship between the area ratio of a and the transmittance of the color image forming layer 4, and the color image 4b formed with the sublimable dye has a relatively high transmittance since the sublimable dye is in a vaporized state. In recent solar cells 7, if a transmittance of 25% is obtained, a sufficient amount of power generation can be obtained. When the solar cell 7 is used, the area ratio of the small holes 3a is desirably set to be relatively large.
Even if the transmittance is 50%, finally, a transmittance of 25% is obtained and the amount of light can be generated.

Further, a color image 4 formed with a sublimable dye
Regarding the transmittance depending on the shading of b, a color tone with a transmittance of 50% can obtain a considerably deep color tone. Therefore, even when the area ratio of the small holes 3a is about 35%, a sufficient amount of power generation can be obtained by applying light color coloring.

Next, if the size of the small holes 3a formed in the metal film 3 is 70 μm or less, it is not confirmed even when viewed from the top of the color image forming layer 4 which is considerably light. It is preferable that the smaller the hole 3a is, the smaller the size of the hole 3a is, because the smaller the hole is, the less visible it is. However, as described above, only the electrohoming method can be used to form the small hole 31a of 30 μm or less, and it cannot be formed thick. If the thickness is 5 μm or more, the dimension can be controlled by the electrohoming method.

When the small holes 3a are 40 μm or more, a resist film can be directly formed by printing by a screen printing method. At present, some screen meshes have a screen mesh with a wire diameter of about several tens of μm, and this allows screen printing to be performed with a width of about 40 μm. From this, when the size is 40 μm or more, it can be formed by direct printing. Further, since the printed film can be formed thick, even if plating is performed to a predetermined thickness, for example, 30 μm or more (plating of two layers of nickel plating and silver plating), the plating does not protrude on the resist side, and the small holes 3a are formed. Since the hole diameter is formed accurately without being reduced, the dimensional control of the hole diameter is easy. As compared with the conventional electrohoming method, the manufacturing process is simple, the number of processes is short, and the manufacturing cost is low.

Further, when the metal film 3 has a thickness of 30 μm or more in this manner, it is possible to form a satin, shining, or striped basis weight, and various patterns can be formed, and the decorativeness can be enhanced.

As described above, a display panel having a metallic appearance satisfying both functions can be obtained as a display panel of a backlight or a solar cell.

When the color image 4b is formed with a sublimable dye, the image is formed with a vaporized dye.
A very bright and clear color image can be obtained.

The color image forming layer 4 transfers the color image formed on the transfer paper with the sublimable ink by an ink jet printer to the receiving layer 4a under heat and pressure, with the receiving layer 4a having a smooth surface. After the transfer, the dye is reheated so that the vaporized dye is reflowed to eliminate dot-like spots. Further, thereafter, the resin of the receiving layer 4a is cured by heating, and the resin-cured surface is polished, thereby making it possible to eliminate indentations and the like made during transfer. as a result,
A beautiful color image 4b can be obtained.

The three types of ultraviolet absorbers described above can absorb ultraviolet rays in a high wavelength region and significantly enhance the light fastness effect.

Forming various patterns such as satin, shining light, stripe shape, lattice, geometry, etc. applied on the upper surface of the metal film 3 enhances the decorativeness, enriches the decorative variations, and gives a sense of quality. Can be.

When a silver metal film is formed on the metal film 3, the light scattering / reflectance increases, and the color image 4b becomes brighter and clearer. When a color image 4b of red and yellow dots is transferred to a silver metal color, a gold metal color such as us gold, us gold is obtained, and the same quality as gold plating can be obtained. Obtainable.

When a white paint is applied to the metal film 3, the light scattering / reflectance increases, and the color image 4b becomes brighter and clearer.

When the above-mentioned display panel is used for an electronic display device having a solar cell or a backlight, it is possible to obtain an electronic display device which has a metallic appearance as a whole and displays a bright and clear color image 4b. is there.

A transparent protective film layer 5 is formed on the color image forming layer 4.
Is formed, not only can the color image 4b be protected, but also the depth of the color image 4b can appear.

FIGS. 4 and 5 show a display panel according to a second embodiment of the present invention. FIG. 4 is a sectional view of a main part of a solar cell dial structure, and FIG. It is a partial enlarged plan view. The difference from the first embodiment is that
That is, a metal film is provided on the lower surface side of the transparent substrate. Since the color image forming layer, the transparent protective film layer, and the like are the same as those in the first embodiment, the description is omitted.

In FIG. 4, a timepiece display panel 11 has a metal film 13 having small holes 13a formed on the lower surface of a transparent substrate 12 made of glass epoxy resin, and a color image forming layer 14 on the upper surface of the transparent substrate 11. The transparent protective film layer 15 is formed by laminating, and the indicator 16 is attached thereon. 17 is
This is a solar cell disposed on the lower surface side of the metal film 13.

The upper surface of the metal film 13 has a satin finish. The metal film 13 has a square small hole 13a of approximately 60 μm as shown in FIG.
And is formed with an area ratio of about 50%.

This metal film 13 is formed as follows. a. A resist film having a size of about 60 μm is screen-printed on a stainless plate at predetermined intervals. The resist film is formed to have a thickness of about 40 to 50 μm. b. A release agent is applied to a portion where a resist film is not formed (a portion where a metal is formed). c. Nickel plating is performed, and a plated metal film having a thickness of about 30 to 40 μm is formed in a portion where there is no resist film. d. The resist film is stripped. e. A satin finish is applied from the upper surface of the plated metal film formed on the stainless steel plate by honing. f. Peel the plated metal film from the stainless steel plate.

In this embodiment, the top surface of the metal film 13 is matted, but the thickness of the metal film 13 is 30 μm.
If it becomes above, it is possible to give the basis weight such as Asahi light and stripe. Various patterns such as a lattice pattern and a geometric pattern can be formed by pressing.

In the present embodiment, the area ratio of the small holes 13a is formed at about 50%, but in the case of a solar cell, the power generation amount is affected by this area ratio. Color image forming layer 14
If the area ratio is at least 35% or more even if the transmittance is considered, the minimum required transmitted light for required power generation can be obtained.

Since the color image 14b of the timepiece display panel 11 having the above-described structure is formed on the metal film 13 via the transparent substrate 12, for example, the color image 14b can be formed in a portion where the color color is dark or light. , Or by providing a partially uncolored part, the color image 14b appears to be floating, and furthermore, an image in which a deeper depth appears.

As a third embodiment of the present invention, the timepiece display panel 1 shown in FIG.
1 is provided with an EL backlight instead of a solar cell on the lower surface side. The area ratio of small holes in the metal film is approximately 35
% And less. When used as a display panel for a backlight, it only serves to illuminate the display panel by transmitting light from the lower surface side and radiating it to the upper surface side.
With the area ratio of 明 る, the brightness that the display panel can read can be obtained. If the area ratio is 35%, it is illuminated considerably brightly.

Although the present invention has been described with reference to a display panel for a timepiece, the present invention is not limited to this. For example, a display panel of a cellular phone with a backlight, an electronic information processing device, or an instrument panel having a display unit with a backlight. When the above-mentioned display plate is used for an electronic display device having a solar cell or a backlight which can be applied to a wide range of applications, it is possible to obtain an electronic display device which has a metallic appearance as a whole and displays a bright and clear color image. Can be.

[0073]

As described above, the display panel of the present invention and the electronic display device provided with the same can sufficiently transmit light because of the large diameter of the small hole of the metal film, and can have a solar cell power generation function and EL. The illumination of the dial by light emission can be satisfied.

Further, a metal color peculiar to the metal appears due to the metal layer, giving a metallic appearance and a high-grade appearance. When a silver metal film is formed on the metal film, the light scattering / reflectance increases, and the color image becomes bright and clear. Further, when a color image of red-yellow dots is transferred to a silver metal color, a gold metal color such as us gold or us gold is obtained, and the same quality as gold plating can be obtained, and a high-grade feeling with a noble metal feeling can be obtained.

When a white paint is applied to the metal film, the light scattering / reflectance is increased, and the color image becomes brighter and clearer.

Further, by forming a transparent protective film layer on the color image forming layer, it is possible to protect the color image and to make the color image appear deeper.

Further, by forming various patterns such as satin, asahikari, stripes, lattices, and geometry on the metal film, the decorativeness can be enhanced, the decorative variations can be enriched, and a sense of quality can be exhibited.

Further, by dispersing an ultraviolet absorber in at least one of the color image forming layer and the transparent protective film layer, ultraviolet rays in a high wavelength region can be absorbed and the light resistance effect can be remarkably enhanced.

Further, unlike the troublesome electrohoming method, a thick resist film can be directly formed by a screen printing method, so that the cost can be reduced.

Further, when the above display panel is used for an electronic display device having a solar cell or a backlight, an electronic display device which has a metallic appearance as a whole and which displays a bright and clear color image can be obtained. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a solar cell dial structure according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the metal film of FIG.

FIG. 3 is a partially enlarged plan view of FIG. 1;

FIG. 4 relates to the second and third embodiments of the present invention,
It is principal part sectional drawing of a solar cell (or EL) dial structure.

FIG. 5 is a partially enlarged plan view of the metal film of FIG. 4;

FIG. 6 is a sectional view of a main part of a conventional solar cell (or EL) dial structure.

FIG. 7 is a process chart showing a method for manufacturing a metal film by an electrohoming method.

FIG. 8 is a sectional view of a main part of a portion where the resist film is removed when the resist film is thick.

FIG. 9 is a cross-sectional view of a main part of a portion where the resist film is removed when the resist film is thin.

FIG. 10 is a cross-sectional view of a main part showing a conventional method for manufacturing a metal film.

11 is a cross-sectional view of a main part showing a state where the plating of the metal film of FIG. 10 has protruded.

FIG. 12 is a cross-sectional view of a main part of a timepiece display panel in which a color coating layer is provided on a conventional metal film.

[Explanation of symbols]

 1, 11 Clock display panel 2, 12 Transparent substrate 3, 13 Metal film 3a, 13a Small hole 4, 14 Color image forming layer 4a, 14a Receptive layer 4b, 14b Color image 5, 15 Transparent protective film layer 6, 16 7, 17 Solar cell (or EL)

Claims (8)

[Claims] 1. A transparent substrate and a small hole having a hole diameter of approximately 5 to 70 μm provided on the upper surface side of the transparent substrate and having an area of approximately 2
A large number of metal films formed at regular intervals at an area ratio of 0 to 50%, a color image forming layer provided on the upper surface side of the metal film and having a color image formed of a sublimable dye, and the color image forming layer A transparent protective film layer formed on the upper surface of the display panel. 2. A transparent substrate and small holes having a hole diameter of approximately 5 to 70 μm provided on the lower surface side of the transparent substrate and having an area of approximately 2
A large number of metal films formed at regular intervals at an area ratio of 0 to 50%, a color image forming layer provided on the upper surface side of the transparent substrate and having a color image formed of a sublimable dye, and the color image forming layer A transparent protective film layer formed on the upper surface of the display panel. 3. The display panel according to claim 1, wherein the color image forming layer has a smooth surface. 4. The method according to claim 1, wherein at least one of the color image forming layer and the transparent protective film layer is provided with 2- (3,5-di-t-butyl-2-human peroxyphenyl) benzotriazole or 2- (3-t-butyl). 4. The display according to claim 1, wherein at least one kind of ultraviolet absorber, which is -5-methyl-2-humanperoxyphenyl) -5-chlorobenzotriazole or ultrafine zinc oxide, is dispersed therein. Board. 5. The metal film according to claim 1, wherein an upper surface of the metal film is formed with a concavo-convex pattern such as a satin pattern, a shining pattern, a stripe pattern, a lattice pattern, and a geometric pattern. Display board. 6. The display panel according to claim 1, wherein the metal film is provided with a silver metal film. 7. The display panel according to claim 1, wherein a white paint film is applied to the metal film. 8. An electronic display device comprising a solar cell or a backlight, wherein the display panel according to any one of claims 1 to 7 is provided on an upper surface of the solar cell or the backlight. .