JP2000035575A - Light-transmitting metallic plate and display device using the plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-transmitting metallic plate which transmits much quantity of light from a light source (EL) and brightly illuminates a display board, and a display device using the same. SOLUTION: This is a metallic plate 32 in which a lot of minute holes 31 are formed and transparent and spherical convex lens parts 39 are formed in the minute hole 31 parts on the incidence plane of the light from the light source, and the light made incident to the lens parts 39 is condensed in the center parts and transmitted through the minute holes 31, to be radiated. The metallic plate 32 is composed of at least one metal layer (silver metal) of a high reflectance. This light-transmitting metallic plate 30 is arranged between a liquid crystal display element 12 or a clock dial and back-light 14 so that the lens parts 39 face the back-light 14 side, and the light made incident to the lens parts 39 in the light-transmitting metallic plate 30 from the back-light 14 is condensed, transmitted through the minute holes 31, and radiated on a display surface. The display is bright and clear, and light and dark irregularity is not caused. In an application to a solar cell clock, transmitted light quantity is large and electric power generation can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a liquid crystal display element with a backlight or a metal plate having a large number of small holes formed in a solar cell, a watch with a backlight, or the like. The present invention relates to a light transmitting metal plate provided and a display device using 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, a liquid crystal display device having a backlight is generally used as a display device. On the other hand, as a display panel for a watch incorporating a solar cell and a backlight, a plastic plate has been used in many cases because light transmission is required.
Various methods have been adopted to decorate the plastic plate to give it a variety of decorations and luxury.

First, a liquid crystal display device will be described. FIG. 12 shows a liquid crystal display device provided with a backlight (for example, electroluminescence, hereinafter abbreviated as EL) in a general liquid crystal display element. FIG. It is a front view showing a state. FIG.
FIG. 2B is a partial sectional view of the transflective plate. The outline will be described. In FIG. 12A, transparent upper display electrodes 3 and lower display electrodes 4 are formed on the inner surfaces of a transparent upper glass substrate 1 and a lower glass substrate 2 which are disposed to face each other. . Further, an upper alignment film 5 and a lower alignment film 6 are provided thereon, and a liquid crystal material 8 is injected while being sealed with a sealing material 11 with spacer balls 7 interposed therebetween. Further, the upper polarizing plate 9 and the lower polarizing plate 1 are provided on the upper surface of the upper glass substrate 1 and the lower surface of the lower glass substrate 2, respectively.
0 is provided to configure the liquid crystal display element 12. 1
Reference numeral 3 denotes a semi-transmissive reflection plate described later bonded to the lower polarizing plate 10, and reference numeral 14 denotes a light source (for example, E
L).

In FIG. 12B, the semi-transmissive reflector 13 is a reflector having both light transmittance and reflectivity, and is bonded to the lower polarizing plate 10 shown in FIG. It is often provided integrally with the liquid crystal display element 12. In addition, the semi-transmissive reflection plate 13 is often formed by thinly depositing aluminum metal on a transparent polyethylene phthalate (PET) film 13a to a thickness of about 0.06 to 0.1 μm in order to impart transparency and reflectivity. An aluminum metal deposited film 13b is used.

As the light source 14, an LED lamp, a hot-cathode tube lamp, a cold-cathode tube lamp, an EL lamp, or the like is used, but is disposed directly below the liquid crystal display element 12, as shown in FIG. And a so-called edge light structure in which the liquid crystal display element 12 is illuminated via the light guide plate by being disposed on the side surface of the liquid crystal display element 12.

In a backlight-equipped liquid crystal display device having the above-described structure, in a bright place where external light is present, light transmitted through the liquid crystal cell 12 is reflected by the semi-transmissive reflection plate 13 so that the display can be visually recognized. When the light source 14 is turned on in a dark place, the light from the light source 14 passes through the semi-transmissive reflection plate 13,
Further, the display is visually recognized through the liquid crystal display element 12.

On the other hand, a timepiece display panel incorporating a solar cell will be described. FIG. 13 shows that the solar cells 41 (or EL14) are arranged in a stacked state below the display panel 40. The figure has an analog pointer mechanism, and the pointer axis passes through the through hole 41a of the solar cell 41 (or EL14) and the through hole 40a of the display panel 40. The drive of the analog pointer mechanism is supplied by the solar cell 41. It is performed by electric power.

[0008] Since a display panel for a timepiece incorporating a solar cell requires transparency, a ceramic or plastic plate is used and decorated by printing or the like to give the cell a unique dark purple color while imparting transparency. It was intended to make it less noticeable and more decorative.

On the other hand, a display panel 4 for a watch incorporating an EL.
As for the reference numeral 0, most use a ceramic or plastic plate as a display plate like the solar cell, but a technique using a metal plate as shown in FIG. 14 is also disclosed. FIG.
FIG. 3 is a partial plan view of a display plate formed of a metal plate and provided with a radial entrance. The display panel 40 has many entrances 4
Ob is formed radially around the through hole 40a, and the entrance 40b has a small diameter and extends intermittently in the radial direction of the display panel 40. The display panel 40 is formed by printing a display pattern such as a time character and a mark on a light transmissive film by printing, and attaching this film to the display panel 40 to form a display panel.

The entrance 40b (the exit in the case of a backlight) is formed with a uniform density.
(In the case of a backlight, an emission port) forms a design that can be recognized by itself. In addition, the light-transmitting film decorated here is attached to the display panel 40 to be decorated. Display patterns, pictures, characters, etc., such as time characters and marks, are formed by printing paint.

[0011]

However, the above-mentioned semi-transmissive reflection plate on which the aluminum metal vapor-deposited film of the liquid crystal display device is formed has a light reflectance of about 30% and a light transmittance of about 2%.
Since it is in a very low state of about 0%, the amount of light that is reflected and returned from outside light is small. Similarly, the amount of light transmitted through the light source is also small, so that the display lacks brightness and is bright. There was a problem that a clear display could not be obtained.

A timepiece display board incorporating the above-described solar cell is said to have no metallic appearance because it is difficult to process and to decorate a display pattern or the like by printing, and it lacks three-dimensionality, and thus does not show a sense of quality due to lack of three-dimensionality. There's a problem. Also, EL
In the display panel incorporating the metal plate shown in FIG. 14, the metal plate appears, but the small holes are visually recognized, and the display panel feels strange.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a liquid crystal display device capable of obtaining a bright, clear display without uneven brightness, and an entrance or an exit which is minute and invisible to the naked eye. The amount of light transmitted to the solar cell is large and the amount of power generation increases. Another object of the present invention is to provide a light-transmitting metal plate having a function of illuminating a display plate with a large amount of transmitted light from a light source (EL) and a display device using the same.

[0014]

In order to achieve the above object, a light transmitting metal plate according to the present invention is a metal plate in which a number of small invisible holes are formed, and light from a light source is incident thereon. A transparent convex spherical lens portion is formed in the small hole portion of the surface in the direction, light entering the lens portion is focused at the central portion, and the collected light is transmitted through the small hole and radiated. It is characterized by that.

Further, the metal plate comprises at least one metal layer, and at least one surface is a metal layer having a high reflectance.

[0016] Further, the fine pores formed in the metal plate have a hole diameter of 5 to 30 µm.

The ratio of the small holes formed in the metal plate is 20 to 50% of the entire surface of the metal plate, and is arranged at a predetermined interval. It is a feature.

Further, a liquid crystal display element in which a liquid crystal is sealed between the two substrates by interposing a spacer ball between two opposing glass substrates provided with a transparent electrode and an alignment film, etc. In a display device provided with a backlight on the lower surface side of the liquid crystal display device, between the liquid crystal display element and the backlight, the lens portion of the light transmitting metal plate is disposed so as to face the backlight side, from the backlight. Light incident on the lens portion of the light-transmitting metal plate is condensed at the central portion, and the condensed light is transmitted through the small hole and emitted to the liquid crystal display element side.

Further, in a display device such as a timepiece having a solar cell, a lens portion of the light transmitting metal plate is disposed as a display plate of the timepiece so as to be on the surface of the display plate, and external light is transmitted through the light transmitting metal plate. The light entering the lens portion is collected at the central portion, and the collected light is transmitted through the small holes and emitted onto the solar cell.

In a display device such as a timepiece having a backlight, a lens portion of the light transmitting metal plate is disposed as a display plate of the timepiece so as to face the backlight side.
Light entering the lens portion of the light-transmitting metal plate from the backlight is condensed at its center, and the condensed light is transmitted through the small holes to irradiate the surface of the display panel. is there.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A light transmitting metal plate and a display device using the same according to the present invention will be described below with reference to the drawings. 1 and 2 show a liquid crystal display device using a light transmitting metal plate according to a first embodiment of the present invention.
(A) is a front view showing the liquid crystal display device in a partially cut-off state. FIG. 1B is a partial cross-sectional view of the light transmitting metal plate of FIG. FIG. 2 is a process chart showing a method for manufacturing the light transmitting metal plate of FIG. In the drawings, the same members as those of the prior art are denoted by the same reference numerals.

In FIG. 1, the liquid crystal display element 12 is the same as that of the prior art, and the description is omitted. The difference from the conventional technology is that instead of the conventional semi-transmissive reflector, a metal plate with a large number of invisible minute holes, which will be described later, is transparent to the small holes on the surface in the direction where light enters from the light source. The light transmitting metal plate 30 having a convex convex lens portion is adhered and fixed to the lower polarizing plate 10 of the liquid crystal display element 12. The light transmitting metal plate 30 may have a structure separated from the lower polarizing plate 10.

In the light transmitting metal plate 30 according to the embodiment of the present invention, as shown in FIG. 1B, a large number of small holes 31 are formed on the surface of a metal plate 32 at a predetermined pitch. The diameter of this hole 31 is 5 to 30 μm,
1 accounts for 20 to 20 of the total surface area of the metal plate 32.
It is formed with an area ratio of 50%. Further, the shape of the small hole 31 is formed in a round shape, but is not limited to this.

The metal plate 32 is made of at least one metal layer, for example, a silver metal layer 33, and its surface is provided with an antioxidant film 33a such as silicon oxide. 34
Is a glass ball (or a plastic ball). The glass ball 34 is fixed to the metal plate 32 by a UV resin, which will be described later, and forms a lens portion 39. The metal plate 32 in the present embodiment is a single-layer metal plate having a silver plating layer.

FIG. 2 is a process chart showing a method of manufacturing a light transmitting metal plate by an electrohoming method. The manufacturing process will be described with reference to FIG. In FIG. 2A, a resist film 36 is formed on a smooth stainless steel flat plate 35 by printing using a printing apparatus. In FIG. 2 (b), the resist film 3 is
6 is exposed, and the portion other than the formation of the small holes 31, that is, the stripped and removed portion 36 a is removed by a resist stripper. FIG. 2 (c)
Then, the release agent 37 is applied to the stripped and removed portion 36a of the resist film 36. In FIG. 2D, silver plating (silver metal) 33 is applied on the release agent 37 by a plating apparatus. In FIG. 2E, the resist film 36 at the small holes 31 is removed by a resist stripper.
After the metal plate 32 is separated from the stainless steel flat plate 35 in FIG. 2F, an oxidation preventing film 33a such as silicon oxide is applied to the surface of the single silver metal layer 33 (metal plate 32) by dipping or the like. A glass ball 34 described later with reference to FIG.
The lens portion 39 is formed by mixing (or plastic ball) with a UV resin binder, converting the ink into an ink, arranging it by printing, and fixing it to the metal plate 32 with the UV resin.
The light transmitting metal plate 30 is completed by the above steps.

Here, a method of arranging glass balls on the above-described metal plate will be described with reference to FIGS. The printing plate 51 shown in FIG. 3 has a large number of through holes 52 provided in a matrix at a predetermined pitch. The material of the printing plate 51 is made of an inelastic material such as nickel, cobalt, chromium, molybdenum, titanium, stainless steel, nickel /
Metal materials such as a cobalt alloy and a Ninkel / chromium alloy are preferred.

FIG. 4 is a sectional view taken along line AA of FIG. The relationship between the hole diameter D of the through hole 52 formed in the printing plate 51 and the particle diameter d of the glass ball 34 to be printed is determined by the metal plate 32.
Can be printed one by one in the small holes 31 by setting the hole diameter D of the printing plate = (1.2 to 1.7) × d (ball diameter).

The printing of the glass ball 34 is performed by a known printing method. That is, as shown in FIG. 5, the glass ball 34 is mixed with a solvent to form an ink, the ink is placed on the printing plate 51, and the ink is scraped on the printing plate 51 with the squeegee 53, so that the glass ball 34 is inserted into the through hole 52. Then, the glass ball 34 can be placed and arranged on the small hole of the metal plate 32 by pressing the UV resin binder. On this occasion,
Since the metal plate 32 has directionality and the metal plate 32 is formed by the electrohoming method as described above, the small holes 3 are formed.
Since an R-shaped sagging surface is formed on the upper surface of the portion 1, the glass ball 34 is provided on the sagging surface, so that it is easy to settle down.

In FIG. 6, ultraviolet rays are radiated through the small holes 31 from the back side of the glass balls 34 disposed in the small holes 31 of the metal plate 32 to cure the UV resin. The light transmitting metal plate 30 is completed. The light transmitting metal plate 30 is composed of one silver metal layer 33 and has a high reflectance. Since the silver metal layer 33 is easily corroded as described above, an anti-oxidation film 33a coated with silicon oxide is applied to the surface to enhance the corrosion resistance.

The operation of the liquid crystal display using the light transmitting metal plate 30 having the above configuration will be described. When there is bright external light, the conventional semi-transmissive reflection plate is not
And the reflectivity of the surface is about 95% due to the silver metal layer 33, which is very high. Considering the reflectivity of the conventional aluminum vapor-deposited film, it is dramatically improved, and the display portion is displayed very brightly.

Further, since the surface on which the silver metal layer 33 is formed is formed so as to cover 50 to 80% of the total surface area, the amount of reflected light is remarkably large when viewed from a conventional aluminum vapor deposition reflector. The reflected light is obtained, and the display can be brightened.

Further, by forming minute irregularities on the reflecting surface and diffusing the reflected light, the reflected light again enters the liquid crystal display element 12 under a uniform light amount distribution. For this reason, there is no unevenness in brightness of the reflected light, and no unevenness in display occurs.

In particular, when the backlight 14 is turned on in a dark place, the lens portion 39 composed of the glass ball 34 has a lens-like function in a large number of small holes 31, that is, light that enters obliquely from the center. The light is condensed toward the portion, and the condensed light is transmitted through the small holes 31 and emitted to the liquid crystal display element 12 side. Therefore, the amount of transmitted light increases and the brightness increases. Therefore, the number of the small holes 31 can be reduced, the surface of the metal plate 32 can be widened, and the reflection area can be widened to brighten the display when bright, and at the same time, the brightness of the backlight 14 can be maintained as usual when dark.

Since the above-mentioned small holes 31 are invisible at a size of 5 to 30 μm, it is possible to obtain effects such as not giving a sense of strangeness in appearance.

FIGS. 7 and 8 show a liquid crystal display device using a light transmitting metal plate according to a second embodiment of the present invention.
FIG. 7A is a front view showing a partially cut-off state of the liquid crystal display device, and FIG. 7B is a partial cross-sectional view of the light transmitting metal plate of FIG. 7A.

The only difference from the first embodiment is the structure of the light transmitting metal plate. Light transmitting metal plate 30
7B, the lower layer is a nickel metal layer 33 as shown in FIG.
b, a metal plate 32 having a two-layer structure in which the upper layer is made of a silver metal layer 33
It is composed of On the surface of the upper silver metal layer 33, a light diffusion surface having minute unevenness (not shown) is formed. Further, a transparent paint film 33 is formed on the upper surface of the silver metal layer 33.
c is given. Small hole 31 on one side of this metal plate 34
A lens portion 39 made of a transparent resin layer having a convex shape is formed in a portion where is formed, and the light transmitting metal plate 30 is formed.
The light transmitting metal plate 30 is formed to have a thickness of about 10 to 50 μm. Among them, the metal film thickness of the upper silver metal layer 33 may be any thickness as long as it is sufficient to form minute unevenness. It is. The lower nickel metal layer 40 is not necessarily limited to nickel metal, but may be any metal that has plating properties, has good adhesion to the silver metal layer 33, and is as cheap as possible.

FIG. 8 is a process chart showing a method for manufacturing the light transmitting metal plate 30. 9A to 9C are the same steps as those in the manufacturing method according to the first embodiment described above, and FIG. 9D and subsequent figures will be described. FIG.
In (d), Ni plating is performed on the release agent 37 by a plating apparatus to form a nickel metal layer 33b. In FIG. 9E, silver plating is further performed on the nickel metal layer 33b by a plating apparatus to form a silver metal layer 33. In FIG. 9F, the resist film 36 at the small holes 31 is removed by a resist stripper. In FIG. 9G, the metal plate 32 having a two-layer structure of the nickel metal layer 33b and the silver metal layer 33 is peeled off from the stainless metal flat plate 35. In FIG. 9H, the surface of the silver metal layer 33 of the metal plate 32 is roughened with a honing device to form a light diffusing surface with minute irregularities (not shown), and then a transparent paint film 33c is formed on the silver metal layer 33. Coating. Further, a screen printing method described later or a UV printing method is used for the portion where the small holes 31 are formed in the direction of one surface (the nickel metal layer 33b side) of the metal plate 32.
The lens portion 39 made of a convex transparent resin is formed by an ultraviolet curing method of the resin. The light transmitting metal plate 30 is completed in the above steps. Instead of coating the transparent coating film 33c on the silver metal layer 33, a color fluorescent pigment may be formed into a coating material and a uniform transparent color coating film (not shown) may be formed by screen printing or the like.

A method of forming the lens portion 39 made of the above-mentioned transparent resin layer having a convex shape will be described. After the metal plate 32 is separated from the stainless steel flat plate 37 in FIG.
The metal plate 32 is set on the mounting table of the screen printing machine,
A transparent resin such as an acrylic resin is printed on the shape of the small hole 31. When screen printing is performed, the printed transparent resin layer has a very small area, so that the printed portion is formed in a round shape with a convex central portion due to the effect of surface tension. By performing heat curing after printing, a lens portion 39 made of a transparent resin layer having a clean surface is formed.

In the ultraviolet irradiation method, after the metal plate 32 is peeled off from the stainless steel flat plate 35, a transparent UV resin is printed on the entire surface of the metal plate 32 to a predetermined thickness to form a UV resin film. By radiating ultraviolet rays from the back surface, the ultraviolet rays pass through the small holes 31 of the metal plate 32,
The UV resin is irradiated to cure the UV resin. At this time, the resin immediately above the small holes 31 is cured by the irradiation of the ultraviolet rays, but the amount of the ultraviolet rays is gradually reduced toward the outer periphery of the small holes 31, so that the resin curing is gradually reduced. come. Uncured UV after irradiation for a certain time
The resin is removed with a solvent and then hardened by heat, thereby forming a lens portion 39 made of a transparent resin layer having a round shape with a convex central portion.

The operation and effect of the above-described liquid crystal display device using the light transmitting metal plate 30 are the same as those of the first embodiment described above, and the description thereof is omitted.

FIGS. 9 and 10 show a display device such as a timepiece equipped with a solar cell using a light-transmitting metal plate according to a third embodiment of the present invention. FIG. 9 (b) is a partially enlarged cross-sectional view of the light transmitting metal plate of FIG. 9 (a), and FIG. 10 is a dotted circle of FIG. 9 (a). It is a top view of a part.

9 and 10, the timepiece display plate 4
The solar cell 41 is disposed below the zero.
The configuration of the timepiece display panel 40 is a thin one-layer metal plate 32 having a large number of small holes 31 disposed on a transparent base 42.
Are bonded and fixed by a fixing means such as an adhesive. This metal plate 3
Reference numeral 2 is a metal plate having a single-layer structure of a silver metal layer 33 as in the first embodiment. A lens portion 39 made of a glass ball 34 is formed on a portion of the metal plate 32 where the small hole 31 is formed on one side (the side opposite to the transparent substrate 42). An index 43 made of a metal layer forming a time character and a mark is provided on a part of the upper surface of the metal plate 32. Further, an oxidation preventing film 33a such as silicon oxide for preventing silver oxidation is provided on the upper surface of the silver metal layer 33. Is given. A timepiece display plate 40 having the light transmitting metal plate 30 as a main part is configured. The metal plate 32 has a single silver metal layer 3.
As described in 3, the two-layer structure used in the second embodiment described above, that is, the nickel metal layer 33b as the lower layer and the silver metal layer 33 as the upper layer may be used. The lower nickel metal 32 is not necessarily limited to nickel metal, but may be any metal that has plating properties, has good adhesion to silver metal, and is as cheap as possible.

As shown in FIG. 10, on the surface of the timepiece display panel 40, small holes 31 are uniformly distributed on the entire surface except for a plurality of island-shaped hourly characters and indices 43 forming marks. The diameter of the small holes 31 is 5 to 30 μm, and is formed at a uniform density that is invisible to the naked eye. The total area occupied by the small holes 31 is determined by the part of the display plate that can be seen from the front (partitioning). The area is formed within the range of 20 to 50% of the area of (in). As described above, the shape of the small hole 31 may be a round hole, a square hole, or a long hole, and the shape is not particularly limited.

A pattern (not shown) is formed on the surface of the thin metal plate 32. Various patterns such as a sunshine pattern, a stripe pattern, a radiation pattern, and a lattice pattern can be formed on this pattern. Further, the thickness of the metal plate 32 is not particularly limited, and it is sufficient that the metal plate 32 has a thickness enough to provide the pattern.

The timepiece display plate 4 having the metal plate 32 formed thereon
The manufacturing method of the light-transmitting metal plate 0 is the same as the manufacturing method of the first embodiment described above, and the description is omitted.

The operation and effect of the above configuration will be described. A convex lens portion 39 made of a glass ball 34 plays the role of a lens in the small hole 31 formed in the metal plate 32 on the surface of the timepiece display plate 40, and external light entering the lens portion 39 is collected at the center. The light is condensed, and the condensed light is transmitted through the small holes 31 and emitted to the surface of the solar cell 41. Since the amount of transmitted light increases, the power generation function of the solar cell 41 can be increased. Also, of course, the metal plate 32
As a result, a metal color peculiar to the metal appears, giving a metallic feeling and a luxurious appearance. Furthermore, since the metal plate 32 is used, processing of a pattern or the like is easy, and the decorativeness of the display panel can be enhanced to enhance the variety of decorations. Further, by giving the surface of the index 43 forming a time character, a mark or the like a gloss, a three-dimensional appearance appears on the display panel, and a noble metal-like luster gives a sense of quality.

FIG. 11 shows a display device such as a timepiece equipped with a backlight (EL) using a light transmitting metal plate according to a fourth embodiment of the present invention, and FIG. FIG. 11B is a partial enlarged cross-sectional view of the light-transmitting metal plate of FIG. 11A with a backlight using a metal plate.

In FIG. 11, an EL 44 is provided below the timepiece display panel 40 as a backlight. The timepiece display panel 40 includes a metal plate 32 formed with a transparent base 42 and a number of small holes 31, a transparent glass ball 34 fixed to the small holes 31, and a time character formed on the transparent base 42. And an index (metal layer) 43 such as a mark.
The metal plate 32 here is composed of a metal plate 32 having a single-layer structure of a silver metal layer 33 as in the first embodiment. Since the surface of the EL 44 is provided with a silver plating layer, the reflectance is high, the absorption of EL light is small, and much light passes through the small holes 31. Incidentally, an oxidation preventing film 33a such as silicon oxide is provided on the surface of the silver plating.

Since the upper surface of the metal plate 32 shows a state of the lower ground of the display panel, a certain specification surface is required. For example, by forming a pattern with an asahi light weight and applying silver plating thereon, it is possible to give the watch display panel 40 a sense of quality. As a pattern, a satin pattern, a stripe pattern, a lattice pattern, or the like can be considered. Further, it is also possible to obtain a painted surface by painting only the upper surface side after silver plating.

The metal plate 32 thus finished is applied to the transparent substrate 4
2 and furthermore, the index 4
3 may be formed by printing, or the indicator 43 made of metal may be attached. Further, not only the index 43 but also various patterns can be formed by printing.

[0051]

As described above, in a display device using the light transmitting metal plate of the present invention, for example, a liquid crystal display device with a backlight, a solar cell and a watch display plate with a backlight, etc. The incoming light is condensed at the center and is transmitted through the small hole and emitted, so that the amount of transmitted light increases. Therefore, in a liquid crystal display device, E
Since a large amount of light emitted by L enters the lens unit, is condensed, transmitted through the small holes, and emitted to the liquid crystal cell, the display by the liquid crystal display element is brightly illuminated. Further, the light transmitting metal plate of the present invention uses a metal having a high reflectance, and has a metal surface of 50-8.
Since it is formed with an area of 0% and has a scattering surface with irregularities on the surface on the liquid crystal display element side, very much external light is reflected, diffused and returned to the viewing side, so that display is not possible. Bright, no light-dark unevenness occurs.

In a timepiece display panel having a solar cell, the amount of power generated by the solar cell could be increased by increasing the amount of transmitted external light passing through the lens portion of the display panel. Further, in a timepiece display panel provided with a backlight, as in the above-described liquid crystal display device, a large amount of light of the backlight is transmitted through a small hole portion to irradiate the display surface, so that the display surface is bright. You can see it.

[Brief description of the drawings]

FIG. 1 is a liquid crystal display device using a light transmitting metal plate according to a first embodiment of the present invention, and FIG. 1 (a) is a front view showing a partially cut-off state of the liquid crystal display device. is there. FIG.
FIG. 2B is a partial cross-sectional view of the light transmitting metal plate of FIG.

FIG. 2 is a process chart showing a method for manufacturing a light transmitting metal plate of the present invention.

FIG. 3 is a plan view of the printing plate according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an explanatory diagram showing a printing method using the printing plate of FIG. 3;

FIG. 6 is a plan view showing only positions of glass balls of the light transmitting metal plate of FIG. 1;

FIG. 7 is a liquid crystal display device using a light transmitting metal plate according to a second embodiment of the present invention, and FIG. 7 (a) is a front view showing a partially cut-off state of the liquid crystal display device. is there. FIG.
FIG. 7B is a partial cross-sectional view of the light transmitting metal plate of FIG.

FIG. 8 is a process chart showing another method of manufacturing the light transmitting metal plate of the present invention.

FIG. 9 is a display device such as a timepiece equipped with a solar cell using a light transmitting metal plate according to a third embodiment of the present invention. FIG. 9 (a) shows a solar cell using a light transmitting metal plate. FIG. 9B is a partial cross-sectional view of the display device with
It is a partial expanded sectional view of a light transmission metal plate of (a).

FIG. 10 is a plan view of a dotted circle in FIG. 9A.

FIG. 11 shows a display device such as a timepiece equipped with a backlight (EL) using a light-transmitting metal plate according to a fourth embodiment of the present invention. Partial sectional view of a display device with a backlight (EL) used;
FIG. 11B is a partially enlarged cross-sectional view of the light transmitting metal plate of FIG.

FIG. 12A is a front view showing a partially cut-off state of a conventional general liquid crystal display device provided with a backlight, and FIG. It is a fragmentary sectional view of the transflective reflector of a).

FIG. 13 is a partial sectional view of a conventional timepiece with a solar cell or EL.

FIG. 14 is a partial plan view of a conventional display panel having a radial emission port.

[Explanation of symbols]

 Reference Signs List 1 upper glass substrate 2 lower glass substrate 3 upper transparent electrode 4 lower transparent electrode 5 upper alignment film 6 lower alignment film 7 spacer ball 8 liquid crystal material 9 upper polarizing plate 10 lower polarizing plate 11 sealing material 12 liquid crystal display element 14 backlight ( EL) 30 light-transmitting metal plate 31 small hole 32 metal plate 33 silver metal layer 33 a antioxidant film 33 b nickel metal layer 33 c transparent resin film 34 glass ball 39 lens unit 40 display panel 41 solar cell 42 transparent substrate 43 indicator

Claims (7)

[Claims] 1. A metal plate having a large number of invisible small holes, wherein a transparent convex spherical lens portion is formed in a small hole portion on a surface in a direction in which light from a light source is incident. A light transmitting metal plate, wherein light entering a lens portion is focused on a central portion, and the collected light is emitted through a small hole. 2. The light transmitting metal plate according to claim 1, wherein the metal plate is composed of at least one metal layer, and at least one surface is a metal layer having a high reflectance. 3. The light-transmitting metal plate according to claim 1, wherein the small holes formed in the metal plate have a diameter of 5 to 30 μm. 4. The method according to claim 1, wherein the small holes formed in the metal plate occupy an area ratio of 20 to 50% of the entire surface of the metal plate and are arranged at predetermined intervals. The light transmitting metal plate according to claim 1, wherein: 5. A liquid crystal display element in which a spacer ball is sandwiched between two opposing glass substrates provided with a transparent electrode and an alignment film and the like and sealed with a sealing material, and a liquid crystal is sealed between the two substrates. In a display device provided with a backlight on the lower surface side of the liquid crystal display device, between the liquid crystal display element and the backlight, the lens portion of the light transmitting metal plate is disposed so as to face the backlight side, from the backlight. 2. The light according to claim 1, wherein the light entering the lens portion of the light transmitting metal plate is focused on the central portion, and the collected light is transmitted through the small hole and emitted to the liquid crystal display element side. A display device using a transmission metal plate. 6. A display device such as a timepiece having a solar cell, wherein a lens portion of the light transmitting metal plate is disposed as a display plate of the timepiece so as to be on a surface of the display plate, and external light is transmitted through the light transmitting metal plate. The light that enters the lens part of is focused at the center,
The display device using a light-transmitting metal plate according to claim 1, wherein the condensed light passes through the small holes and is emitted onto the solar cell. 7. A display device such as a timepiece with a backlight, wherein a lens portion of the light transmitting metal plate is disposed as a display plate of the timepiece so as to face the backlight side, and the light transmitting metal plate is provided from the backlight. 2. The light transmitting metal according to claim 1, wherein the light entering the lens portion of the plate is focused on the center thereof, and the collected light passes through the small holes to irradiate the surface of the display plate. Display device using a plate.